FIX: Đã sắp xếp lại (v202608061030)

app/api/v1/ai_proxy.py

@@ -1,7 +1,16 @@
+import asyncio
+import ipaddress
+import json
+import socket
+from urllib.parse import urlparse
+
 import httpx
-from fastapi import APIRouter, HTTPException
+from fastapi import APIRouter, Depends, HTTPException
 from pydantic import BaseModel
-from typing import Optional, Any, Dict, List
+from typing import Any, Dict
+
+from app.api.v1.auth import get_current_user
+from app.api.v1.user_config import _load_ai_configs, _get_default_providers
 
 router = APIRouter()
 
@@ -10,17 +19,108 @@ class ProxyRequest(BaseModel):
     headers: Dict[str, str] = {}
     body: Dict[str, Any] = {}
 
-import json
+
+# Ranges that are never legitimate AI endpoints: cloud metadata + this host.
+_BLOCKED_NETWORKS = [
+    ipaddress.ip_network("169.254.0.0/16"),   # link-local / cloud metadata
+    ipaddress.ip_network("0.0.0.0/8"),
+]
+# Private ranges: only reachable when the target host is one the user has
+# explicitly configured as an AI provider (e.g. local Ollama/LM Studio).
+_PRIVATE_NETWORKS = [
+    ipaddress.ip_network("10.0.0.0/8"),
+    ipaddress.ip_network("172.16.0.0/12"),
+    ipaddress.ip_network("192.168.0.0/16"),
+    ipaddress.ip_network("127.0.0.0/8"),
+    ipaddress.ip_network("::1/128"),
+    ipaddress.ip_network("fc00::/7"),          # ULA
+]
+
+_LOOPBACK_HOSTS = {"localhost", "127.0.0.1", "::1", "0.0.0.0"}
+
+
+def _configured_ai_hosts(user_id: str) -> set:
+    """Hosts the user has configured as AI providers (from saved config + defaults)."""
+    hosts = set()
+    configs = _load_ai_configs()
+    providers = configs.get(user_id) or _get_default_providers()
+    for p in providers:
+        base = (p.get("api_base_url") or "").strip()
+        if not base:
+            continue
+        try:
+            host = urlparse(base).hostname
+            if host:
+                hosts.add(host.lower())
+        except Exception:
+            continue
+    return hosts
+
+
+async def _resolve_host_ips(hostname: str):
+    """Resolve hostname to IPs (non-blocking). Returns list of ipaddress objects."""
+    loop = asyncio.get_event_loop()
+    try:
+        infos = await loop.run_in_executor(None, socket.getaddrinfo, hostname, None)
+        ips = []
+        for info in infos:
+            try:
+                ips.append(ipaddress.ip_address(info[4][0]))
+            except ValueError:
+                continue
+        return ips
+    except Exception:
+        return []
+
+
+async def _validate_target_url(url: str, user_id: str):
+    parsed = urlparse(url)
+    if parsed.scheme not in ("http", "https"):
+        raise HTTPException(status_code=400, detail="URL chỉ hỗ trợ giao thức http/https")
+    if parsed.username or parsed.password:
+        raise HTTPException(status_code=400, detail="URL không được chứa thông tin đăng nhập")
+    hostname = (parsed.hostname or "").lower()
+    if not hostname:
+        raise HTTPException(status_code=400, detail="URL không hợp lệ")
+
+    allowed_hosts = _configured_ai_hosts(user_id)
+
+    # Hostname-level fast path for loopback hosts
+    if hostname in _LOOPBACK_HOSTS:
+        if hostname in allowed_hosts:
+            return
+        raise HTTPException(status_code=403, detail="Target nội bộ không nằm trong danh sách AI provider đã cấu hình")
+
+    # Try direct IP parse (hostname may itself be an IP)
+    try:
+        ip = ipaddress.ip_address(hostname)
+        ips = [ip]
+    except ValueError:
+        ips = await _resolve_host_ips(hostname)
+
+    if not ips:
+        raise HTTPException(status_code=502, detail="Không phân giải được hostname")
+
+    for ip in ips:
+        if any(ip in net for net in _BLOCKED_NETWORKS):
+            raise HTTPException(status_code=403, detail="Target bị chặn (metadata/link-local không được phép)")
+        if any(ip in net for net in _PRIVATE_NETWORKS):
+            if hostname in allowed_hosts:
+                continue
+            raise HTTPException(status_code=403, detail="Target IP nội bộ không nằm trong danh sách AI provider đã cấu hình")
+
 
 @router.post("/proxy")
-async def proxy_llm(req: ProxyRequest):
+async def proxy_llm(req: ProxyRequest, current_user: dict = Depends(get_current_user)):
+    await _validate_target_url(req.url, current_user["user_id"])
+    # Never forward the app's own auth token upstream.
+    headers = {
+        k: v for k, v in req.headers.items()
+        if k.lower() not in ("host", "origin", "referer", "x-auth-token")
+    }
     try:
-        async with httpx.AsyncClient(timeout=180.0) as client:
-            resp = await client.post(
-                req.url,
-                headers={k: v for k, v in req.headers.items() if k.lower() not in ('host', 'origin', 'referer')},
-                json=req.body
-            )
+        async with httpx.AsyncClient(timeout=180.0, follow_redirects=False) as client:
+            resp = await client.post(req.url, headers=headers, json=req.body)
             raw = resp.text
             try:
                 return resp.json()
@@ -36,5 +136,7 @@ async def proxy_llm(req: ProxyRequest):
         if 'localhost' in req.url or '127.0.0.1' in req.url:
             msg += "\nNếu app chạy trong Docker, localhost trỏ vào container, không ra host.\nHãy thay localhost bằng host.docker.internal hoặc IP bridge Docker (172.17.0.1)."
         raise HTTPException(status_code=502, detail=msg)
+    except HTTPException:
+        raise
     except Exception as e:
         raise HTTPException(status_code=500, detail=str(e))

app/api/v1/audio.py

@@ -8,12 +8,32 @@ from pydantic import BaseModel
 from typing import Optional, List
 import json
 from app.config import settings
-from app.api.v1.auth import get_current_user
+from app.api.v1.auth import get_current_user, enforce_password_changed
 from app.api.v1.projects import get_optional_user
 from app.models.user import get_db_connection
 
 router = APIRouter()
 
+MAX_AUDIO_UPLOAD_BYTES = 1024 * 1024 * 1024  # 1 GB
+
+def _safe_file_id(file_id: str) -> str:
+    """Strip any path components from a client-supplied file id."""
+    if not file_id:
+        return ""
+    return os.path.basename(file_id.replace("\\", "/"))
+
+def _resolve_storage_path(file_id: str) -> str:
+    """Return the existing file path (processed first, then uploads) for a
+    sanitized file id, or '' when not found."""
+    fid = _safe_file_id(file_id)
+    if not fid:
+        return ""
+    for d in (settings.PROCESSED_DIR, settings.UPLOADS_DIR):
+        p = os.path.join(d, fid)
+        if os.path.isfile(p):
+            return p
+    return ""
+
 class EditRequest(BaseModel):
     file_id: str
     cut_start_ms: Optional[float] = None
@@ -58,16 +78,32 @@ class PythonToolRequest(BaseModel):
 
 @router.post("/upload")
 async def upload_audio(file: UploadFile = File(...), current_user: Optional[dict] = Depends(get_optional_user)):
+    if current_user:
+        enforce_password_changed(current_user)
     user_id = current_user["user_id"] if current_user else "anonymous"
-    ext = os.path.splitext(file.filename)[1]
+    ext = os.path.splitext(file.filename or "")[1]
     if not ext:
         ext = ".wav"
     file_id = f"user_{user_id}_{uuid.uuid4()}{ext}"
     file_path = os.path.join(settings.UPLOADS_DIR, file_id)
     
+    # Stream upload in chunks with a hard size cap (avoids loading a multi-GB
+    # WAV into RAM and bounds disk usage).
     with open(file_path, "wb") as f:
-        content = await file.read()
-        f.write(content)
+        size = 0
+        while True:
+            chunk = await file.read(1024 * 1024)
+            if not chunk:
+                break
+            size += len(chunk)
+            if size > MAX_AUDIO_UPLOAD_BYTES:
+                f.close()
+                try:
+                    os.remove(file_path)
+                except OSError:
+                    pass
+                raise HTTPException(status_code=413, detail="File âm thanh quá lớn (giới hạn 1GB)")
+            f.write(chunk)
     
     # Save original filename as sidecar metadata
     import json
@@ -90,15 +126,12 @@ async def upload_audio(file: UploadFile = File(...), current_user: Optional[dict
 
 @router.post("/edit")
 async def edit_audio(req: EditRequest):
-    upload_path = os.path.join(settings.UPLOADS_DIR, req.file_id)
-    processed_path = os.path.join(settings.PROCESSED_DIR, req.file_id)
-    
     # Use uploaded file if it exists, or look in processed if it was already edited
-    if not os.path.exists(upload_path) and not os.path.exists(processed_path):
+    if not _resolve_storage_path(req.file_id):
         raise HTTPException(status_code=404, detail="File not found")
         
     from app.tasks.worker import edit_audio_task
-    task = edit_audio_task.delay(req.dict())
+    task = edit_audio_task.delay(req.model_dump())
     
     return {
         "task_id": task.id
@@ -106,15 +139,10 @@ async def edit_audio(req: EditRequest):
 
 @router.get("/download/{file_id}")
 async def download_audio(file_id: str):
-    processed_path = os.path.join(settings.PROCESSED_DIR, file_id)
-    upload_path = os.path.join(settings.UPLOADS_DIR, file_id)
-    
-    if os.path.exists(processed_path):
-        return FileResponse(processed_path, media_type="audio/wav", filename=file_id)
-    elif os.path.exists(upload_path):
-        return FileResponse(upload_path, media_type="audio/wav", filename=file_id)
-    
-    raise HTTPException(status_code=404, detail="File not found")
+    path = _resolve_storage_path(file_id)
+    if not path:
+        raise HTTPException(status_code=404, detail="File not found")
+    return FileResponse(path, media_type="audio/wav", filename=os.path.basename(path))
 
 @router.get("/waveform/{file_id}")
 async def get_waveform(file_id: str, num_peaks: int = Query(default=800, ge=50, le=4000)):
@@ -122,14 +150,8 @@ async def get_waveform(file_id: str, num_peaks: int = Query(default=800, ge=50,
     API endpoint vẽ Peak Waveform đồng bộ (Week 2).
     Trả về dữ liệu peak waveform cho hiển thị đồ thị sóng âm trên Frontend.
     """
-    upload_path = os.path.join(settings.UPLOADS_DIR, file_id)
-    processed_path = os.path.join(settings.PROCESSED_DIR, file_id)
-    
-    if os.path.exists(processed_path):
-        file_path = processed_path
-    elif os.path.exists(upload_path):
-        file_path = upload_path
-    else:
+    file_path = _resolve_storage_path(file_id)
+    if not file_path:
         raise HTTPException(status_code=404, detail="File not found")
     
     from app.core.dsp_utils import generate_peak_waveform
@@ -140,14 +162,8 @@ async def get_waveform_rms(file_id: str, num_points: int = Query(default=800, ge
     """
     API endpoint vẽ RMS Waveform (mượt hơn peak).
     """
-    upload_path = os.path.join(settings.UPLOADS_DIR, file_id)
-    processed_path = os.path.join(settings.PROCESSED_DIR, file_id)
-    
-    if os.path.exists(processed_path):
-        file_path = processed_path
-    elif os.path.exists(upload_path):
-        file_path = upload_path
-    else:
+    file_path = _resolve_storage_path(file_id)
+    if not file_path:
         raise HTTPException(status_code=404, detail="File not found")
     
     from app.core.dsp_utils import generate_rms_waveform
@@ -159,26 +175,20 @@ async def analyze_audio_with_ai(req: AIAnalysisRequest):
     API endpoint phân tích cấu trúc khuôn nhạc bằng AI (Week 4).
     Gọi OpenAI Compatible API (DeepSeek/Ollama) để phân đoạn bố cục.
     """
-    upload_path = os.path.join(settings.UPLOADS_DIR, req.file_id)
-    processed_path = os.path.join(settings.PROCESSED_DIR, req.file_id)
-    
-    if os.path.exists(processed_path):
-        file_path = processed_path
-    elif os.path.exists(upload_path):
-        file_path = upload_path
-    else:
+    file_path = _resolve_storage_path(req.file_id)
+    if not file_path:
         raise HTTPException(status_code=404, detail="File not found")
     
     from app.tasks.worker import analyze_ai_task
     task = analyze_ai_task.delay(
-        file_id=req.file_id,
+        file_id=_safe_file_id(req.file_id),
         api_base_url=req.api_base_url,
         model=req.model
     )
     
     return {
         "task_id": task.id,
-        "file_id": req.file_id
+        "file_id": _safe_file_id(req.file_id)
     }
 
 @router.post("/export")
@@ -186,19 +196,13 @@ async def export_audio(req: ExportRequest):
     """
     API endpoint xuất tệp âm thanh sang nhiều định dạng (WAV/MP3/OGG).
     """
-    upload_path = os.path.join(settings.UPLOADS_DIR, req.file_id)
-    processed_path = os.path.join(settings.PROCESSED_DIR, req.file_id)
-    
-    if os.path.exists(processed_path):
-        source_path = processed_path
-    elif os.path.exists(upload_path):
-        source_path = upload_path
-    else:
+    source_path = _resolve_storage_path(req.file_id)
+    if not source_path:
         raise HTTPException(status_code=404, detail="File not found")
     
     from app.tasks.worker import export_audio_task
     task = export_audio_task.delay(
-        file_id=req.file_id,
+        file_id=_safe_file_id(req.file_id),
         format=req.format,
         sample_rate=req.sample_rate,
         bit_depth=req.bit_depth
@@ -206,29 +210,24 @@ async def export_audio(req: ExportRequest):
     
     return {
         "task_id": task.id,
-        "file_id": req.file_id
+        "file_id": _safe_file_id(req.file_id)
     }
 
 @router.post("/ai-scan")
-async def ai_scan_audio(req: AIScanRequest):
+async def ai_scan_audio(req: AIScanRequest, current_user: Optional[dict] = Depends(get_optional_user)):
     """
     17_AI_SCAN.md Feature 1: AI Loop Scan & Automated Marker Labeling.
     Uses AIDSPEngine to find optimal recurring loop region with zero-crossing alignment.
     """
+    if current_user:
+        enforce_password_changed(current_user)
     from app.core.ai_dsp_engine import AIDSPEngine
     import soundfile as sf
     import numpy as np
     
-    file_path = None
-    if req.file_id:
-        upload_path = os.path.join(settings.UPLOADS_DIR, req.file_id)
-        processed_path = os.path.join(settings.PROCESSED_DIR, req.file_id)
-        if os.path.exists(processed_path):
-            file_path = processed_path
-        elif os.path.exists(upload_path):
-            file_path = upload_path
+    file_path = _resolve_storage_path(req.file_id) if req.file_id else ""
 
-    if file_path and os.path.exists(file_path):
+    if file_path:
         data, sr = sf.read(file_path)
         if data.ndim > 1:
             data = data.T
@@ -252,6 +251,8 @@ async def ai_cut_audio(req: AICutRequest, current_user: Optional[dict] = Depends
     Executes raw binary sample slice at exact zero-crossing coordinates.
     """
     user_id = current_user["user_id"] if current_user else "anonymous"
+    if current_user:
+        enforce_password_changed(current_user)
     from app.core.ai_dsp_engine import AIDSPEngine
     import soundfile as sf
     import numpy as np
@@ -259,16 +260,9 @@ async def ai_cut_audio(req: AICutRequest, current_user: Optional[dict] = Depends
     output_file_id = f"user_{user_id}_ai_cut_{uuid.uuid4().hex[:8]}.wav"
     out_path = os.path.join(settings.PROCESSED_DIR, output_file_id)
     
-    file_path = None
-    if req.file_id:
-        upload_path = os.path.join(settings.UPLOADS_DIR, req.file_id)
-        processed_path = os.path.join(settings.PROCESSED_DIR, req.file_id)
-        if os.path.exists(processed_path):
-            file_path = processed_path
-        elif os.path.exists(upload_path):
-            file_path = upload_path
+    file_path = _resolve_storage_path(req.file_id) if req.file_id else ""
 
-    if file_path and os.path.exists(file_path):
+    if file_path:
         data, sr = sf.read(file_path)
         if data.ndim > 1:
             data = data.T
@@ -295,6 +289,8 @@ async def run_python_dsp_tool(req: PythonToolRequest, current_user: Optional[dic
     Handles normalize peak, invert phase, swap channels, zero-crossing align, and synth wave generation.
     """
     user_id = current_user["user_id"] if current_user else "anonymous"
+    if current_user:
+        enforce_password_changed(current_user)
     from app.core.python_tools_engine import PythonToolsEngine
     from app.core.ai_dsp_engine import AIDSPEngine
     import soundfile as sf

app/api/v1/auth.py

@@ -1,10 +1,15 @@
 import uuid
 import time
-from fastapi import APIRouter, HTTPException, Header, Depends
+import threading
+from fastapi import APIRouter, HTTPException, Header, Depends, Request, Response
+from fastapi.responses import JSONResponse
 from pydantic import BaseModel, EmailStr
 from typing import Optional
 from app.models.user import get_db_connection
-from app.core.auth import hash_password, verify_password, create_token, decode_token, seed_admin
+from app.core.auth import (
+    hash_password, verify_password, create_token, decode_token, seed_admin,
+    COOKIE_NAME, X_AUTH_HEADER,
+)
 
 router = APIRouter()
 
@@ -21,10 +26,49 @@ class ChangePasswordRequest(BaseModel):
     old_password: str
     new_password: str
 
-def get_current_user(authorization: Optional[str] = Header(None)):
-    if not authorization or not authorization.startswith("Bearer "):
+# ── Brute-force guard: in-memory per-IP failed-login limiter ──
+_LOGIN_FAILURES = {}          # ip -> [timestamps]
+_LOGIN_LOCK = threading.Lock()
+MAX_LOGIN_ATTEMPTS = 10
+LOGIN_WINDOW_SEC = 900        # 15 min
+LOGIN_BLOCK_SEC = 900
+
+def _check_login_ratelimit(ip: str):
+    now = time.time()
+    with _LOGIN_LOCK:
+        stamps = [t for t in _LOGIN_FAILURES.get(ip, []) if now - t < LOGIN_WINDOW_SEC]
+        if len(stamps) >= MAX_LOGIN_ATTEMPTS:
+            raise HTTPException(status_code=429, detail="Quá nhiều lần đăng nhập thất bại. Vui lòng thử lại sau 15 phút.")
+        _LOGIN_FAILURES[ip] = stamps
+
+def _record_login_failure(ip: str):
+    now = time.time()
+    with _LOGIN_LOCK:
+        stamps = _LOGIN_FAILURES.setdefault(ip, [])
+        stamps.append(now)
+        _LOGIN_FAILURES[ip] = [t for t in stamps if now - t < LOGIN_WINDOW_SEC]
+
+def _record_login_success(ip: str):
+    with _LOGIN_LOCK:
+        _LOGIN_FAILURES.pop(ip, None)
+
+def _set_auth_cookie(response: Response, token: str):
+    response.set_cookie(
+        COOKIE_NAME, token,
+        max_age=7 * 24 * 3600, httponly=True, samesite="lax",
+        # path="/" (default); secure flag set by proxy when behind TLS
+    )
+
+def get_current_user(request: Request, authorization: Optional[str] = Header(None), x_auth_token: Optional[str] = Header(None)):
+    token = None
+    if authorization and authorization.startswith("Bearer "):
+        token = authorization.split(" ")[1]
+    elif x_auth_token:
+        token = x_auth_token
+    elif request.cookies.get(COOKIE_NAME):
+        token = request.cookies.get(COOKIE_NAME)
+    if not token:
         raise HTTPException(status_code=401, detail="Thiếu Token xác thực hoặc Token không hợp lệ")
-    token = authorization.split(" ")[1]
     payload = decode_token(token)
     if not payload:
         raise HTTPException(status_code=401, detail="Token đã hết hạn hoặc không hợp lệ")
@@ -39,7 +83,10 @@ def enforce_password_changed(user: dict):
         )
 
 @router.post("/login")
-async def login(req: LoginRequest):
+async def login(req: LoginRequest, request: Request):
+    client_ip = request.client.host if request.client else "unknown"
+    _check_login_ratelimit(client_ip)
+
     conn = get_db_connection()
     cursor = conn.cursor()
     
@@ -65,14 +112,17 @@ async def login(req: LoginRequest):
     conn.close()
     
     if not user or not user["is_active"]:
+        _record_login_failure(client_ip)
         raise HTTPException(status_code=400, detail="Tài khoản hoặc mật khẩu không chính xác")
         
     if not verify_password(password, user["hashed_password"]):
+        _record_login_failure(client_ip)
         raise HTTPException(status_code=400, detail="Tài khoản hoặc mật khẩu không chính xác")
         
     token = create_token(user["id"], user["username"], user["role"], user["must_change_password"])
-    
-    return {
+    _record_login_success(client_ip)
+
+    resp = JSONResponse({
         "access_token": token,
         "user": {
             "id": user["id"],
@@ -81,13 +131,24 @@ async def login(req: LoginRequest):
             "role": user["role"],
             "must_change_password": bool(user["must_change_password"])
         }
-    }
+    })
+    _set_auth_cookie(resp, token)
+    return resp
+
+def _validate_password_strength(password: str):
+    """Minimal strength policy: >= 8 chars and not trivially common."""
+    if len(password) < 8:
+        raise HTTPException(status_code=400, detail="Mật khẩu phải có ít nhất 8 ký tự")
+    lowered = password.lower()
+    if lowered in ("admin123", "password", "12345678", "123456789", "qwerty123"):
+        raise HTTPException(status_code=400, detail="Mật khẩu quá dễ đoán, vui lòng chọn mật khẩu khác")
 
 @router.post("/register")
-async def register(req: RegisterRequest):
+async def register(req: RegisterRequest, request: Request):
     username = req.username.strip()
     email = req.email.strip()
     password = req.password.strip()
+    _validate_password_strength(password)
     
     conn = get_db_connection()
     cursor = conn.cursor()
@@ -115,7 +176,7 @@ async def register(req: RegisterRequest):
     conn.close()
     
     token = create_token(user_id, username, "standard", False)
-    return {
+    resp = JSONResponse({
         "access_token": token,
         "user": {
             "id": user_id,
@@ -124,7 +185,9 @@ async def register(req: RegisterRequest):
             "role": "standard",
             "must_change_password": False
         }
-    }
+    })
+    _set_auth_cookie(resp, token)
+    return resp
 
 @router.post("/change-password")
 async def change_password(req: ChangePasswordRequest, current_user: dict = Depends(get_current_user)):
@@ -153,10 +216,12 @@ async def change_password(req: ChangePasswordRequest, current_user: dict = Depen
     conn.close()
     
     new_token = create_token(updated_user["id"], updated_user["username"], updated_user["role"], False)
-    return {
+    resp = JSONResponse({
         "message": "Đổi mật khẩu thành công!",
         "access_token": new_token
-    }
+    })
+    _set_auth_cookie(resp, new_token)
+    return resp
 
 @router.get("/profile")
 async def get_profile(current_user: dict = Depends(get_current_user)):

app/api/v1/media.py

@@ -0,0 +1,160 @@
+import os
+import platform
+from typing import List, Optional
+
+from fastapi import APIRouter, Depends, HTTPException, Query
+from fastapi.responses import FileResponse
+
+from app.api.v1.auth import get_current_user
+
+router = APIRouter()
+
+MEDIA_EXTS = {
+    ".wav", ".mp3", ".ogg", ".flac", ".aiff", ".aif", ".m4a", ".aac", ".opus",
+    ".mid", ".midi"
+}
+
+AUDIO_EXTS = {".wav", ".mp3", ".ogg", ".flac", ".aiff", ".aif", ".m4a", ".aac", ".opus"}
+MIDI_EXTS = {".mid", ".midi"}
+
+
+def _safe_path(path: str) -> str:
+    if not path:
+        raise HTTPException(status_code=400, detail="Thiếu path")
+    if "\x00" in path:
+        raise HTTPException(status_code=400, detail="Path không hợp lệ")
+    return os.path.normpath(path)
+
+
+REAL_FS_TYPES = {
+    "ext2", "ext3", "ext4", "xfs", "btrfs", "jfs", "reiserfs",
+    "ntfs", "ntfs3", "vfat", "exfat", "fat", "hfs", "hfsplus", "apfs",
+    "zfs", "f2fs", "iso9660", "udf", "nfs", "nfs4", "cifs", "smb3", "fuseblk",
+}
+
+PSEUDO_FS_TYPES = {
+    "proc", "sysfs", "devpts", "tmpfs", "devtmpfs", "overlay", "squashfs",
+    "cgroup", "cgroup2", "pstore", "securityfs", "debugfs", "tracefs",
+    "configfs", "fusectl", "hugetlbfs", "mqueue", "binfmt_misc", "nsfs",
+    "autofs", "ramfs", "efivarfs", "rpc_pipefs", "fuse", "fusefs",
+}
+
+
+@router.get("/computer")
+async def list_computer_roots(current_user: dict = Depends(get_current_user)):
+    """Liệt kê các ổ đĩa / mount point thật của máy (My Computer)."""
+    system = platform.system()
+    roots = []
+    if system == "Windows":
+        import string
+        for drive in string.ascii_uppercase:
+            root = drive + ":\\"
+            try:
+                if os.path.exists(root):
+                    roots.append({"path": root, "name": drive + ":", "is_dir": True})
+            except OSError:
+                continue
+    else:
+        # Unix/Linux/macOS: chỉ liệt kê filesystem thật, bỏ pseudo/docker/systemd mounts
+        seen = set()
+        try:
+            with open("/proc/mounts", "r") as f:
+                for line in f:
+                    parts = line.split()
+                    if len(parts) < 3:
+                        continue
+                    device, mount, fstype = parts[0], parts[1], parts[2]
+                    if fstype in PSEUDO_FS_TYPES:
+                        continue
+                    if fstype not in REAL_FS_TYPES:
+                        # giữ mount point root "/" nếu không thuộc pseudo
+                        if mount != "/":
+                            continue
+                    if mount in seen:
+                        continue
+                    seen.add(mount)
+                    # lọc mount point rác kiểu /run/credentials/...
+                    if mount.startswith("/run/") or mount.startswith("/var/lib/docker"):
+                        continue
+                    try:
+                        if os.path.isdir(mount):
+                            label = mount if mount != "/" else "Root (/)"
+                            roots.append({"path": mount, "name": label, "is_dir": True})
+                    except OSError:
+                        pass
+        except OSError:
+            pass
+        # macOS fallback: liệt kê /Volumes
+        if system == "Darwin":
+            try:
+                for name in sorted(os.listdir("/Volumes")):
+                    full = os.path.join("/Volumes", name)
+                    if os.path.isdir(full):
+                        roots.append({"path": full, "name": name, "is_dir": True})
+            except OSError:
+                pass
+        if not roots:
+            roots = [{"path": "/", "name": "Root (/)", "is_dir": True}]
+    return {"system": system, "roots": roots}
+
+
+@router.get("/browse")
+async def browse_directory(path: str = Query(...), current_user: dict = Depends(get_current_user)):
+    """Liệt kê nội dung một thư mục trên máy: thư mục con + file audio/MIDI."""
+    resolved = _safe_path(path)
+    if not os.path.isdir(resolved):
+        raise HTTPException(status_code=404, detail="Không tìm thấy thư mục")
+
+    dirs, files = [], []
+    try:
+        entries = os.listdir(resolved)
+    except OSError as e:
+        raise HTTPException(status_code=403, detail=f"Không thể đọc thư mục: {e}")
+
+    for name in entries:
+        if name.startswith("."):
+            continue
+        full = os.path.join(resolved, name)
+        try:
+            if os.path.isdir(full):
+                dirs.append({"name": name, "path": full, "is_dir": True})
+            else:
+                ext = os.path.splitext(name)[1].lower()
+                try:
+                    size = os.path.getsize(full)
+                except OSError:
+                    size = 0
+                kind = "midi" if ext in MIDI_EXTS else ("audio" if ext in AUDIO_EXTS else "other")
+                files.append({
+                    "name": name,
+                    "path": full,
+                    "is_dir": False,
+                    "size_mb": round(size / (1024 * 1024), 2),
+                    "ext": ext,
+                    "kind": kind
+                })
+        except OSError:
+            continue
+
+    dirs.sort(key=lambda d: d["name"].lower())
+    files.sort(key=lambda f: f["name"].lower())
+    parent = os.path.dirname(resolved)
+    return {
+        "path": resolved,
+        "parent": parent if parent != resolved else None,
+        "dirs": dirs,
+        "files": files
+    }
+
+
+@router.get("/file")
+async def serve_local_file(path: str = Query(...), current_user: dict = Depends(get_current_user)):
+    """Phục vụ file audio/MIDI cục bộ để preview."""
+    resolved = _safe_path(path)
+    if not os.path.isfile(resolved):
+        raise HTTPException(status_code=404, detail="Không tìm thấy file")
+    ext = os.path.splitext(resolved)[1].lower()
+    if ext not in MEDIA_EXTS:
+        raise HTTPException(status_code=403, detail="Loại file không được hỗ trợ preview")
+    media_type = "audio/wav" if ext in AUDIO_EXTS else "audio/midi"
+    return FileResponse(resolved, media_type=media_type, filename=os.path.basename(resolved))

app/api/v1/multitrack.py

@@ -54,7 +54,7 @@ async def mix_multitrack_session(req: MultitrackSessionRequest):
     
     # Gửi task xuống Celery Worker
     from app.tasks.worker import mix_multitrack_task
-    task = mix_multitrack_task.delay(req.dict())
+    task = mix_multitrack_task.delay(req.model_dump())
     
     return {
         "task_id": task.id,
@@ -69,7 +69,7 @@ async def process_session(req: MultitrackSessionRequest):
     Xử lý từng clip, sau đó hòa âm tất cả tracks lại với nhau.
     """
     from app.tasks.worker import process_multitrack_session_task
-    task = process_multitrack_session_task.delay(req.dict())
+    task = process_multitrack_session_task.delay(req.model_dump())
     
     return {
         "task_id": task.id,

app/api/v1/plugins.py

@@ -9,7 +9,7 @@ from app.core.render_engine import PythonRenderEngine
 from app.core.soundfont_inspector import SoundFontInspector
 from app.core.soundfont_converter import SoundFontConverter
 from app.core.soundfont_scanner import SoundFontAutoScanner
-from app.api.v1.auth import get_current_user
+from app.api.v1.auth import get_current_user, enforce_password_changed
 
 router = APIRouter()
 
@@ -79,11 +79,23 @@ async def upload_soundfont(
     background_tasks: BackgroundTasks = None,
     current_user: dict = Depends(get_current_user)
 ):
+    enforce_password_changed(current_user)
     if not (file.filename and (file.filename.endswith(".sf2") or file.filename.endswith(".sf3"))):
         raise HTTPException(status_code=400, detail="Only .sf2 / .sf3 files are allowed")
 
-    contents = await file.read()
-    if not PluginManager.validate_sf2_header(contents):
+    # Stream upload in chunks with a hard size cap (SGM-class fonts can exceed
+    # 500MB; reading the whole body into RAM would OOM the server).
+    MAX_SF_UPLOAD_BYTES = 2 * 1024 * 1024 * 1024  # 2 GB
+    contents = bytearray()
+    while True:
+        chunk = await file.read(1024 * 1024)
+        if not chunk:
+            break
+        contents.extend(chunk)
+        if len(contents) > MAX_SF_UPLOAD_BYTES:
+            raise HTTPException(status_code=413, detail="SoundFont quá lớn (giới hạn 2GB)")
+
+    if not PluginManager.validate_sf2_header(bytes(contents[:4096])):
         raise HTTPException(status_code=400, detail="Invalid SoundFont file: missing RIFF/sfbk header")
 
     file_ext = os.path.splitext(file.filename)[1]
@@ -139,15 +151,36 @@ async def delete_soundfont(sf_id: str, current_user: dict = Depends(get_current_
 @router.get("/soundfonts/download/{sf_id}")
 async def download_soundfont_asset(sf_id: str):
     clean_id = sf_id.replace("sf_", "") if sf_id.startswith("sf_") else sf_id
-    for base_dir in [UPLOAD_SF_DIR, SYSTEM_SF_DIR]:
+    # Cũng tìm trong static/soundfonts (font bundled theo deployment) — trước
+    # đây chỉ UPLOAD + SYSTEM → font bundled 404 → incognito (IndexedDB rỗng)
+    # không tải được font → instrument CÂM (browser thường dùng cache nên OK).
+    static_sf_dir = os.path.join(os.path.dirname(os.path.dirname(os.path.dirname(__file__))), "static", "soundfonts")
+    for base_dir in [UPLOAD_SF_DIR, SYSTEM_SF_DIR, static_sf_dir]:
         if not os.path.isdir(base_dir):
             continue
-        for ext in [".sf2", ".sf3"]:
-            for fname in os.listdir(base_dir):
-                fbase, fext = os.path.splitext(fname)
-                if fext.lower() == ext and fbase.lower() == clean_id.lower():
-                    full = os.path.join(base_dir, fname)
-                    return FileResponse(full, media_type="application/octet-stream", filename=f"soundfont{ext}")
+        # Prefer SF2: the client FluidSynth WASM cannot decode SF3 (Ogg Vorbis)
+        # samples, so any SF3 would play silence in the browser.
+        for fname in os.listdir(base_dir):
+            fbase, fext = os.path.splitext(fname)
+            if fext.lower() == ".sf2" and fbase.lower() == clean_id.lower():
+                full = os.path.join(base_dir, fname)
+                return FileResponse(full, media_type="application/octet-stream", filename="soundfont.sf2")
+        # Only an SF3 exists -> decompress it to a playable SF2 on demand (cached)
+        for fname in os.listdir(base_dir):
+            fbase, fext = os.path.splitext(fname)
+            if fext.lower() == ".sf3" and fbase.lower() == clean_id.lower():
+                full = os.path.join(base_dir, fname)
+                try:
+                    from app.core.soundfont_converter import SoundFontConverter
+                    sf2_path = os.path.join(UPLOAD_SF_DIR, clean_id + ".sf2")
+                    if os.path.exists(sf2_path) and os.path.getmtime(sf2_path) >= os.path.getmtime(full):
+                        return FileResponse(sf2_path, media_type="application/octet-stream", filename="soundfont.sf2")
+                    result = SoundFontConverter().sf3_to_sf2(full, sf2_path)
+                    if result != full and os.path.exists(result):
+                        return FileResponse(result, media_type="application/octet-stream", filename="soundfont.sf2")
+                except Exception as e:
+                    print(f"[soundfont-download] SF3->SF2 conversion failed for {full}: {e}")
+                return FileResponse(full, media_type="application/octet-stream", filename="soundfont.sf3")
     raise HTTPException(status_code=404, detail="SoundFont asset not found")
 
 
@@ -161,8 +194,13 @@ async def render_project(
     req: RenderRequest,
     current_user: dict = Depends(get_current_user)
 ):
+    enforce_password_changed(current_user)
     engine = PythonRenderEngine()
-    output_path = os.path.join(settings.PROCESSED_DIR, req.output_filename or "render_output.wav")
+    # Prevent path traversal: strip any directory components and force .wav.
+    safe_name = os.path.basename((req.output_filename or "render_output.wav").replace("\\", "/"))
+    if not safe_name.lower().endswith(".wav"):
+        safe_name += ".wav"
+    output_path = os.path.join(settings.PROCESSED_DIR, safe_name)
     try:
         result_path = engine.render_project(req.project_json, output_path)
         return {"url": f"/static/audio/processed/{os.path.basename(result_path)}", "path": result_path}

app/api/v1/projects.py

@@ -18,6 +18,11 @@ def upgrade_project_json_if_needed(project_data: dict) -> dict:
         return project_data
     
     tracks = project_data.get("tracks", [])
+    # Legacy format stores item start times in SECONDS; convert using the real
+    # seconds-per-bar (old code hardcoded /4.0 which shifted every item's
+    # position for any tempo other than the one where 1 bar = 4s).
+    bpm_val = float(project_data.get("bpm", 120.0) or 120.0)
+    seconds_per_bar = (60.0 / bpm_val) * 4
     upgraded_tracks = []
     for t in tracks:
         track_id = str(t.get("id", ""))
@@ -33,8 +38,8 @@ def upgrade_project_json_if_needed(project_data: dict) -> dict:
                 "id": c.get("id"),
                 "name": c.get("name", "Audio Clip"),
                 "type": "AUDIO_ITEM",
-                "start_bar": c.get("startTime", 0.0) / 4.0,
-                "duration_bars": 4.0,
+                "start_bar": round(c.get("startTime", 0.0) / seconds_per_bar, 6),
+                "duration_bars": round((c.get("duration", 4.0) if c.get("duration") else 4.0) / seconds_per_bar, 6),
                 "clip_start_offset_bars": 0.0,
                 "source_data": {
                     "audio_file_url": f"/static/audio/uploads/{t.get('serverFileId')}" if t.get("serverFileId") else "",
@@ -49,11 +54,11 @@ def upgrade_project_json_if_needed(project_data: dict) -> dict:
                 "id": m.get("id"),
                 "name": m.get("name", "MIDI Item"),
                 "type": "MIDI_ITEM",
-                "start_bar": m.get("startTime", 0.0) / 4.0,
-                "duration_bars": m.get("duration", 4.0),
+                "start_bar": round(m.get("startTime", 0.0) / seconds_per_bar, 6),
+                "duration_bars": round((m.get("duration", 4.0) or 4.0) / seconds_per_bar, 6),
                 "clip_start_offset_bars": 0.0,
                 "source_data": {
-                    "total_buffer_bars": m.get("duration", 8.0),
+                    "total_buffer_bars": round((m.get("duration", 8.0) or 8.0) / seconds_per_bar, 6),
                     "notes": m.get("notes", [])
                 }
             })
@@ -283,13 +288,30 @@ async def update_cloud_project(project_id: str, req: SaveProjectRequest, current
     conn = get_db_connection()
     cursor = conn.cursor()
     
-    cursor.execute("SELECT id FROM projects WHERE id = ? AND user_id = ? AND is_temp = 0", (project_id, user_id))
-    exists = cursor.fetchone()
-    if not exists:
+    cursor.execute("SELECT id, size_bytes FROM projects WHERE id = ? AND user_id = ? AND is_temp = 0", (project_id, user_id))
+    existing = cursor.fetchone()
+    if not existing:
         conn.close()
         raise HTTPException(status_code=404, detail="Không tìm thấy dự án để cập nhật")
-        
+    
     new_size_bytes = len(validated_data_json.encode("utf-8"))
+    
+    # Enforce storage quota (same rule as save_cloud_project — previously
+    # update bypassed the quota entirely).
+    cursor.execute("SELECT storage_limit_mb FROM user_quotas WHERE user_id = ?", (user_id,))
+    quota_row = cursor.fetchone()
+    storage_limit_mb = quota_row["storage_limit_mb"] if quota_row else 500
+    cursor.execute("SELECT SUM(size_bytes) as total_used FROM projects WHERE user_id = ? AND is_temp = 0", (user_id,))
+    used_row = cursor.fetchone()
+    used_bytes = (used_row["total_used"] if used_row and used_row["total_used"] else 0) - (existing["size_bytes"] or 0)
+    max_bytes = storage_limit_mb * 1024 * 1024
+    if used_bytes + new_size_bytes > max_bytes:
+        conn.close()
+        raise HTTPException(
+            status_code=400,
+            detail=f"Dung lượng dự án vượt quá hạn mức Quota ({storage_limit_mb}MB). Vui lòng dọn dẹp hoặc nâng cấp tài khoản."
+        )
+    
     now = time.time()
     
     cursor.execute("""

app/api/v1/user_config.py

@@ -96,7 +96,7 @@ async def get_user_ai_config(authorization: Optional[str] = Header(None)):
 async def save_user_ai_config(req: SaveAIConfigRequest, authorization: Optional[str] = Header(None)):
     uid = _get_user_id(authorization)
     configs = _load_ai_configs()
-    configs[uid] = [p.dict() for p in req.providers]
+    configs[uid] = [p.model_dump() for p in req.providers]
     _save_all(ai_configs=configs)
     return {
         "success": True,

app/core/auth.py

@@ -10,7 +10,36 @@ from typing import Optional, Dict, Any
 from app.models.user import get_db_connection
 from app.config import settings
 
-SECRET_KEY = os.getenv("SECRET_KEY", "sonicforge_secret_key_super_secure_2026")
+COOKIE_NAME = "sf_token"
+X_AUTH_HEADER = "X-Auth-Token"
+
+def _load_or_create_secret_key() -> str:
+    """Persistent random SECRET_KEY.
+
+    Priority: env SECRET_KEY > {STORAGE_DIR}/.secret_key (auto-generated on
+    first run). Never falls back to a hardcoded value: a known secret lets
+    anyone forge admin tokens.
+    """
+    env_key = os.getenv("SECRET_KEY", "").strip()
+    if env_key:
+        return env_key
+    key_file = os.path.join(settings.STORAGE_DIR, ".secret_key")
+    try:
+        os.makedirs(settings.STORAGE_DIR, exist_ok=True)
+        if os.path.exists(key_file):
+            with open(key_file, "r") as f:
+                key = f.read().strip()
+            if len(key) >= 32:
+                return key
+        key = secrets.token_hex(32)
+        with open(key_file, "w") as f:
+            f.write(key)
+        return key
+    except Exception:
+        # Last resort: ephemeral random key (all tokens invalid on restart).
+        return secrets.token_hex(32)
+
+SECRET_KEY = _load_or_create_secret_key()
 
 def hash_password(password: str, salt: Optional[str] = None) -> str:
     """

app/core/render_engine.py

@@ -1,4 +1,4 @@
-import os, logging
+import os, logging, math
 import numpy as np
 import soundfile as sf
 import scipy.signal as signal
@@ -87,12 +87,18 @@ class PythonRenderEngine:
             return url_or_id
         return url_or_id
 
-    def render_session_container(self, session: dict, section_store: dict, bpm: float, time_sig_num: int, total_samples: int) -> np.ndarray:
+    def render_session_container(self, session: dict, section_store: dict, bpm: float, time_sig_num: int, total_samples: int, _cache: dict = None) -> np.ndarray:
         session_buffer = np.zeros((2, total_samples), dtype=np.float32)
 
+        # Solo semantics: when any track is soloed, only soloed tracks sound.
+        tracks = session.get("tracks", [])
+        solo_ids = {t.get("id") for t in tracks if t.get("solo")}
+
         _channel_counter = 0
 
-        for track in session.get("tracks", []):
+        for track in tracks:
+            if solo_ids and track.get("id") not in solo_ids:
+                continue
             track_type = track.get("type", "AUDIO")
             track_buffer = np.zeros((2, total_samples), dtype=np.float32)
 
@@ -123,8 +129,17 @@ class PythonRenderEngine:
                         try:
                             audio_data, sr = sf.read(resolved_path, dtype='float32')
                             if sr != self.sample_rate:
-                                # Resampling fallback if simple, otherwise skip
-                                pass
+                                # Proper resampling: previously a silent no-op that
+                                # played 48kHz audio at the wrong speed/pitch.
+                                from scipy.signal import resample_poly
+                                g = math.gcd(sr, self.sample_rate)
+                                audio_data = resample_poly(
+                                    audio_data,
+                                    up=self.sample_rate // g,
+                                    down=sr // g,
+                                    axis=-1,
+                                )
+                                sr = self.sample_rate
                             
                             # Handle channel mapping (Mono/Stereo)
                             if len(audio_data.shape) == 1:
@@ -148,7 +163,7 @@ class PythonRenderEngine:
                                 if actual_len > 0:
                                     track_buffer[:, start_sample:write_end] += sliced_audio[:, :actual_len]
                         except Exception as e:
-                            print(f"[RenderEngine] Error reading audio file {resolved_path}: {e}")
+                            logger.warning("[RenderEngine] Error reading audio file %s: %s", resolved_path, e)
 
                 elif item_type == "MIDI_ITEM":
                     source_data = item.get("source_data", {})
@@ -284,21 +299,27 @@ class PythonRenderEngine:
                             actual_len = min(synth_buffer.shape[1], total_samples)
                             track_buffer[:, :actual_len] += synth_buffer[:, :actual_len]
                         except Exception as e:
-                            print(f"[RenderEngine] Error rendering MIDI: {e}")
+                            logger.warning("[RenderEngine] Error rendering MIDI: %s", e)
 
                 elif item_type == "SECTION_ITEM":
                     source_data = item.get("source_data", {})
                     sec_id = source_data.get("referenced_section_id", "")
                     if sec_id and sec_id in section_store:
-                        # Render nested section recursively
-                        sec_container = section_store[sec_id]
-                        sec_buffer = self.render_session_container(
-                            session=sec_container,
-                            section_store=section_store,
-                            bpm=bpm,
-                            time_sig_num=time_sig_num,
-                            total_samples=total_samples
-                        )
+                        # Render nested section recursively, cached per section id
+                        # so repeated section instances don't re-render every time.
+                        cache = _cache if _cache is not None else {}
+                        if sec_id in cache:
+                            sec_buffer = cache[sec_id]
+                        else:
+                            sec_buffer = self.render_session_container(
+                                session=section_store[sec_id],
+                                section_store=section_store,
+                                bpm=bpm,
+                                time_sig_num=time_sig_num,
+                                total_samples=total_samples,
+                                _cache=cache,
+                            )
+                            cache[sec_id] = sec_buffer
                         
                         # Apply non-destructive crop/slicing on section buffer
                         if offset_sample < total_samples:
@@ -327,7 +348,7 @@ class PythonRenderEngine:
                         board = Pedalboard([Chorus(rate_hz=1.5, depth=0.25)])
                         track_buffer = board(track_buffer, sample_rate=self.sample_rate)
                     except Exception as e:
-                        print(f"[RenderEngine] Pedalboard Chorus failed: {e}")
+                        logger.warning("[RenderEngine] Pedalboard Chorus failed: %s", e)
                 else:
                     # Fallback chorus using simple LFO delay modulation in scipy/numpy
                     try:
@@ -341,14 +362,14 @@ class PythonRenderEngine:
                             wet[ch, :] = track_buffer[ch, indices]
                         track_buffer = dry + wet * 0.5
                     except Exception as e:
-                        print(f"[RenderEngine] Fallback Chorus failed: {e}")
+                        logger.warning("[RenderEngine] Fallback Chorus failed: %s", e)
             elif fx_type == "reverb":
                 if HAS_PEDALBOARD:
                     try:
                         board = Pedalboard([Reverb(room_size=0.5, wet_level=0.4, dry_level=0.6)])
                         track_buffer = board(track_buffer, sample_rate=self.sample_rate)
                     except Exception as e:
-                        print(f"[RenderEngine] Pedalboard Reverb failed: {e}")
+                        logger.warning("[RenderEngine] Pedalboard Reverb failed: %s", e)
                 else:
                     # Fallback reverb using exponentially decaying noise room impulse response
                     try:
@@ -368,7 +389,7 @@ class PythonRenderEngine:
                             wet[ch, :] = conv
                         track_buffer = dry + wet * 0.4
                     except Exception as e:
-                        print(f"[RenderEngine] Fallback Reverb failed: {e}")
+                        logger.warning("[RenderEngine] Fallback Reverb failed: %s", e)
 
             # Process track volume
             if HAS_PEDALBOARD:
@@ -410,7 +431,8 @@ class PythonRenderEngine:
             section_store=section_store,
             bpm=bpm,
             time_sig_num=time_sig_num,
-            total_samples=total_samples
+            total_samples=total_samples,
+            _cache={},
         )
 
         # Normalization to prevent clipping

app/core/soundfont_converter.py

@@ -83,6 +83,35 @@ class SoundFontConverter:
         except Exception:
             return False
 
+    def _encode_sample_ogg(self, pcm: bytes, rate: int, tmp_dir: str) -> bytes:
+        """Encode a single mono 16-bit PCM slice to an Ogg Vorbis stream."""
+        tmp_wav = os.path.join(tmp_dir, "sample_tmp.wav")
+        tmp_ogg = os.path.join(tmp_dir, "sample_tmp.ogg")
+        try:
+            with open(tmp_wav, "wb") as fw:
+                with wave.open(fw, "wb") as w:
+                    w.setnchannels(1)
+                    w.setsampwidth(2)
+                    w.setframerate(rate)
+                    w.writeframes(pcm)
+            subprocess.run([
+                "ffmpeg", "-y", "-i", tmp_wav,
+                "-c:a", "libvorbis", "-q:a", "3",
+                "-f", "ogg", tmp_ogg
+            ], capture_output=True, timeout=600, check=True)
+            with open(tmp_ogg, "rb") as fo:
+                return fo.read()
+        except Exception as e:
+            logger.error(f"Sample OGG encode failed: {e}")
+            return b""
+        finally:
+            for p in [tmp_wav, tmp_ogg]:
+                try:
+                    if os.path.exists(p):
+                        os.remove(p)
+                except Exception:
+                    pass
+
     def _sf2_to_sf3_python(self, sf2_path: str, sf3_path: str) -> bool:
         has_ogg = self._check_ffmpeg_ogg()
         if not has_ogg:
@@ -100,7 +129,7 @@ class SoundFontConverter:
             logger.warning("Not a valid SF2 file")
             return False
 
-        # Find smpl chunk recursively
+        # Find smpl chunk (PCM sample data) recursively
         smpl = _find_chunk(data, b"smpl")
         if smpl is None:
             logger.warning("No smpl chunk found in SF2")
@@ -113,46 +142,103 @@ class SoundFontConverter:
             logger.warning("Sample data too small")
             return False
 
-        tmp_wav = sf3_path + ".tmp.wav"
-        tmp_ogg = sf3_path + ".tmp.ogg"
+        # Locate shdr (sample headers) inside the pdta LIST
+        pdta = _find_list_of_type(data, b"pdta", 12)
+        if not pdta:
+            logger.warning("No pdta LIST found")
+            return False
+        _, _, pdta_size, pdta_data_off = pdta
+        shdr = _find_chunk_in_list(data, b"shdr", pdta_data_off, pdta_size - 4)
+        if not shdr:
+            logger.warning("No shdr chunk found")
+            return False
+        _, _, shdr_size, shdr_data_off = shdr
+        if shdr_size <= 0 or shdr_size % 46 != 0:
+            logger.warning(f"Invalid shdr size {shdr_size}")
+            return False
+        n_samples = shdr_size // 46
 
+        # Locate ifil (version) inside the INFO LIST
+        ifil_abs = None
+        info = _find_list_of_type(data, b"INFO", 12)
+        if info:
+            _, _, info_size, info_data_off = info
+            ifil = _find_chunk_in_list(data, b"ifil", info_data_off, info_size - 4)
+            if ifil:
+                ifil_abs = ifil[3]
+
+        import tempfile
+        tmp_dir = tempfile.mkdtemp(prefix="sf3conv_")
+        ogg_parts = []
+        new_shdr = bytearray()
+        byte_offset = 0
+        ogg_bytes = 0
         try:
-            # Write samples as WAV
-            with open(tmp_wav, "wb") as fw:
-                with wave.open(fw, "wb") as w:
-                    w.setnchannels(1)
-                    w.setsampwidth(2)
-                    w.setframerate(44100)
-                    w.writeframes(sample_data)
+            for i in range(n_samples):
+                base = shdr_data_off + i * 46
+                # shdr layout: name[20] | start(u32) end(u32) loopstart(u32) loopend(u32) samplerate(i32) ...
+                start, end, startloop, endloop, rate = struct.unpack("<IIIIi", data[base + 20:base + 40])
+                sampletype = struct.unpack("<H", data[base + 44:base + 46])[0]
+                ogg_stream = b""
+                if end >= start and start * 2 < len(sample_data):
+                    pcm = sample_data[start * 2:(end + 1) * 2]
+                    if len(pcm) >= 4:
+                        safe_rate = rate if 1000 < rate < 192000 else 44100
+                        ogg_stream = self._encode_sample_ogg(pcm, safe_rate, tmp_dir)
+                # SF3: start/end are byte offsets into the concatenated OGG stream.
+                # FluidSynth treats shdr `end` as EXCLUSIVE (reads [start..end-1]),
+                # so end = start + ogg length.
+                new_start = byte_offset
+                new_end = byte_offset + len(ogg_stream)
+                # OGG loop pointers are relative to the individual decompressed sample
+                new_sloop = (startloop - start) if (startloop > start and startloop <= end) else 0
+                new_eloop = (endloop - start) if (endloop > start and endloop <= end) else 0
+                # Mark the sample as Ogg Vorbis compressed (FLUID_SAMPLETYPE_OGG_VORBIS = 0x20)
+                new_stype = sampletype | 0x20
+                new_shdr += data[base:base + 20]                       # sample name
+                new_shdr += struct.pack("<IIIIi", new_start, new_end, new_sloop, new_eloop, rate)
+                new_shdr += data[base + 40:base + 44]                  # originalpitch, correction, samplelink
+                new_shdr += struct.pack("<H", new_stype)
+                ogg_parts.append(ogg_stream)
+                ogg_bytes += len(ogg_stream)
+                byte_offset = new_start + len(ogg_stream)
+                if len(ogg_stream) % 2 == 1:
+                    ogg_parts.append(b"\x00")
+                    byte_offset += 1
 
-            # Compress to Ogg Vorbis
-            subprocess.run([
-                "ffmpeg", "-y", "-i", tmp_wav,
-                "-c:a", "libvorbis", "-q:a", "3",
-                "-f", "ogg", tmp_ogg
-            ], capture_output=True, timeout=600, check=True)
+            if not ogg_parts:
+                logger.warning("No samples to encode")
+                return False
 
-            with open(tmp_ogg, "rb") as fo:
-                ogg_data = fo.read()
-
-            compression = (1 - len(ogg_data) / max(len(sample_data), 1)) * 100
-            logger.info(f"Compressed {len(sample_data)} -> {len(ogg_data)} bytes ({compression:.0f}%)")
-
-            ogg_padded = ogg_data if len(ogg_data) % 2 == 0 else ogg_data + b"\x00"
-            new_smpl_size = len(ogg_data)
+            ogg_padded = b"".join(ogg_parts)
+            if len(ogg_padded) % 2 == 1:
+                ogg_padded += b"\x00"
+            new_smpl_size = len(ogg_padded)
             old_padded = smpl_old_size + (1 if smpl_old_size % 2 == 1 else 0)
-            new_padded = len(ogg_padded)
-            delta = new_padded - old_padded
+            delta = len(ogg_padded) - old_padded
 
             # Rebuild file: replace smpl chunk and update all sizes
             out = bytearray()
-            out.extend(data[:smpl_head_off])           # up to smpl chunk header
+            out.extend(data[:smpl_head_off])           # up to smpl chunk header (excl. id)
+            out.extend(b"smpl")                        # chunk id (required for valid SF3)
             out.extend(struct.pack("<I", new_smpl_size))  # new smpl size
-            out.extend(ogg_padded)                     # compressed data (even-padded)
-            out.extend(data[smpl_head_off + 8 + old_padded:])  # rest of file
+            out.extend(ogg_padded)                     # concatenated per-sample OGG streams
+            rest_off = smpl_head_off + 8 + old_padded
+            rest = bytearray(data[rest_off:])
+            # Patch the shdr sample headers inside the pdta copy
+            shdr_in_rest = shdr_data_off - rest_off
+            if shdr_in_rest < 0 or shdr_in_rest + shdr_size > len(rest):
+                logger.warning("shdr not found after smpl chunk")
+                return False
+            rest[shdr_in_rest:shdr_in_rest + shdr_size] = new_shdr
+            out.extend(rest)
 
             data_out = bytes(out)
 
+            # SF3 requires version 3.0 so FluidSynth treats it as an SF3 file
+            if ifil_abs is not None and ifil_abs + 4 <= len(data_out):
+                data_out = data_out[:ifil_abs] + struct.pack("<HH", 3, 0) + data_out[ifil_abs + 4:]
+
             # Find sdta LIST and update its size
             sdta = _find_list_of_type(data_out, b"sdta", 12)
             if sdta:
@@ -160,12 +246,11 @@ class SoundFontConverter:
                 data_out = _update_size(data_out, lh_off + 4, lh_size + delta)
 
             # Update RIFF root size
-            old_riff_size = struct.unpack("<I", data_out[4:8])[0]
             new_total = len(data_out) - 8
             data_out = _update_size(data_out, 4, new_total)
 
             with open(sf3_path, "wb") as fout:
-                fout.write(bytes(data_out))
+                fout.write(data_out)
 
             # Validate: check that RIFF size matches actual size
             written = os.path.getsize(sf3_path)
@@ -174,6 +259,7 @@ class SoundFontConverter:
                 logger.warning(f"Size mismatch: RIFF says {parsed_riff}, actual is {written - 8}")
                 return False
 
+            logger.info(f"Converted {n_samples} samples -> {ogg_bytes} bytes OGG ({100 * (1 - ogg_bytes / max(len(sample_data), 1)):.0f}% smaller)")
             return True
 
         except subprocess.TimeoutExpired:
@@ -185,12 +271,50 @@ class SoundFontConverter:
             traceback.print_exc()
             return False
         finally:
-            for p in [tmp_wav, tmp_ogg]:
+            try:
+                import shutil
+                shutil.rmtree(tmp_dir, ignore_errors=True)
+            except Exception:
+                pass
+
+    @staticmethod
+    def _sf3_plays_audio(path: str) -> bool:
+        """Verify a SoundFont actually loads and renders audible audio (guards
+        against shipping malformed SF3 files that silently play nothing).
+
+        Uses the low-level CFFI binding (new_fluid_synth / write_float) — the
+        high-level Synth() class does not exist in this binding, so it is never
+        used here.
+        """
+        if not os.path.exists(path):
+            return False
+        try:
+            import fluidsynth as _fs
+            import numpy as np
+            _settings = _fs.new_fluid_settings()
+            _fl = _fs.new_fluid_synth(_settings)
+            try:
+                h = _fs.fluid_synth_sfload(_fl, path.encode("utf-8"), 1)
+                if h < 0:
+                    return False
+                _fs.fluid_synth_program_select(_fl, 0, h, 0, 0)
+                _fs.fluid_synth_noteon(_fl, 0, 60, 100)
+                frames = 8820  # 0.2s
+                buf = np.zeros(frames * 2, dtype=np.float32)
+                _fs.fluid_synth_write_float(
+                    _fl, frames, buf.ctypes.data, 0, 1,
+                    buf.ctypes.data + frames * 4, 0, 1
+                )
+                _fs.fluid_synth_noteoff(_fl, 0, 60)
+                rms = float(np.sqrt(np.mean(buf ** 2)))
+                return rms > 1e-4
+            finally:
                 try:
-                    if os.path.exists(p):
-                        os.remove(p)
+                    _fs.delete_fluid_synth(_fl)
                 except Exception:
                     pass
+        except Exception:
+            return False
 
     @staticmethod
     def _find_sf3_converter():
@@ -208,9 +332,18 @@ class SoundFontConverter:
 
         sf3_path = os.path.splitext(sf2_path)[0] + ".sf3"
 
+        # Reuse a working SF3 if it is newer than the SF2 AND actually plays
+        # audio. Malformed SF3s (e.g. produced by an older converter) are
+        # re-converted automatically instead of being shipped silently broken.
         if os.path.exists(sf3_path) and os.path.getmtime(sf3_path) >= os.path.getmtime(sf2_path):
-            logger.info(f"SF3 already up-to-date: {sf3_path}")
-            return sf3_path
+            if self._sf3_plays_audio(sf3_path):
+                logger.info(f"SF3 already up-to-date: {sf3_path}")
+                return sf3_path
+            logger.warning(f"Existing SF3 does not play audio, re-converting: {sf3_path}")
+            try:
+                os.remove(sf3_path)
+            except Exception:
+                pass
 
         converter = self._find_sf3_converter()
         try:
@@ -228,9 +361,16 @@ class SoundFontConverter:
 
             if converter == "python":
                 if self._sf2_to_sf3_python(sf2_path, sf3_path) and os.path.exists(sf3_path):
-                    size_mb = os.path.getsize(sf3_path) / (1024 * 1024)
-                    logger.info(f"Created SF3: {sf3_path} ({size_mb:.2f} MB)")
-                    return sf3_path
+                    if self._sf3_plays_audio(sf3_path):
+                        size_mb = os.path.getsize(sf3_path) / (1024 * 1024)
+                        logger.info(f"Created SF3: {sf3_path} ({size_mb:.2f} MB)")
+                        return sf3_path
+                    # Conversion produced a broken file — never ship it
+                    logger.warning(f"Converted SF3 failed audio verification, removing: {sf3_path}")
+                    try:
+                        os.remove(sf3_path)
+                    except Exception:
+                        pass
                 logger.warning(f"Python converter failed for {sf2_path}, returning SF2 path")
                 return sf2_path
 
@@ -242,6 +382,165 @@ class SoundFontConverter:
             logger.error(f"Error converting {sf2_path}: {e}")
             return sf2_path
 
+    def sf3_to_sf2(self, sf3_path: str, sf2_path: str = None) -> str:
+        """Convert an SF3 (Ogg Vorbis samples) soundfont into a playable SF2.
+
+        The client FluidSynth WASM cannot decode Ogg Vorbis/SF3 samples, so any
+        SF3 soundfont (converted or uploaded) plays silence. Decompressing to
+        SF2 makes every instrument audible again.
+        """
+        if not os.path.exists(sf3_path):
+            raise FileNotFoundError(f"Source SF3 file not found: {sf3_path}")
+
+        try:
+            with open(sf3_path, "rb") as f:
+                data = f.read()
+        except Exception as e:
+            raise IOError(f"Cannot read {sf3_path}: {e}")
+
+        if len(data) < 12 or data[:4] != b"RIFF" or data[8:12] != b"sfbk":
+            raise ValueError(f"Not a valid SoundFont file: {sf3_path}")
+
+        smpl = _find_chunk(data, b"smpl")
+        if not smpl:
+            raise ValueError("No smpl chunk found")
+        smpl_head_off, _, smpl_old_size, smpl_data_off = smpl
+        sample_data = data[smpl_data_off:smpl_data_off + smpl_old_size]
+
+        pdta = _find_list_of_type(data, b"pdta", 12)
+        if not pdta:
+            raise ValueError("No pdta LIST found")
+        _, _, pdta_size, pdta_data_off = pdta
+        shdr = _find_chunk_in_list(data, b"shdr", pdta_data_off, pdta_size - 4)
+        if not shdr:
+            raise ValueError("No shdr chunk found")
+        _, _, shdr_size, shdr_data_off = shdr
+        if shdr_size <= 0 or shdr_size % 46 != 0:
+            raise ValueError(f"Invalid shdr size {shdr_size}")
+        n_samples = shdr_size // 46
+
+        ifil_abs = None
+        info = _find_list_of_type(data, b"INFO", 12)
+        if info:
+            _, _, info_size, info_data_off = info
+            ifil = _find_chunk_in_list(data, b"ifil", info_data_off, info_size - 4)
+            if ifil:
+                ifil_abs = ifil[3]
+
+        import tempfile
+        tmp_dir = tempfile.mkdtemp(prefix="sf2conv_")
+        pcm_parts = []
+        new_shdr = bytearray()
+        frame_offset = 0
+        total_pcm_bytes = 0
+        try:
+            for i in range(n_samples):
+                base = shdr_data_off + i * 46
+                name = data[base:base + 20]
+                start, end, loopstart, loopend, rate = struct.unpack("<IIIIi", data[base + 20:base + 40])
+                sampletype = struct.unpack("<H", data[base + 44:base + 46])[0]
+                frames = 0
+                pcm = b""
+                if end > start and start < len(sample_data):
+                    # FluidSynth reads the OGG region as [start..end-1]
+                    ogg = sample_data[start:min(end, len(sample_data))]
+                    if len(ogg) >= 4 and ogg[:4] == b"OggS":
+                        pcm = self._decode_sample_ogg(ogg, tmp_dir)
+                        frames = len(pcm) // 2
+                new_start = frame_offset
+                new_end = frame_offset + frames
+                # SF3 loop points are relative to the decompressed sample; SF2 needs absolute
+                new_loopstart = loopstart + new_start if (loopstart or loopend) else 0
+                new_loopend = loopend + new_start if (loopstart or loopend) else 0
+                # Clear the Ogg Vorbis flag; keep mono/left/right/linked flags
+                new_stype = sampletype & ~0x20
+                new_shdr += name
+                new_shdr += struct.pack("<IIIIi", new_start, new_end, new_loopstart, new_loopend, rate)
+                new_shdr += data[base + 40:base + 44]
+                new_shdr += struct.pack("<H", new_stype)
+                pcm_parts.append(pcm)
+                frame_offset += frames
+                if frames:
+                    total_pcm_bytes += frames * 2
+
+            if total_pcm_bytes == 0:
+                logger.warning("SF3 contained no decodable samples")
+                return sf3_path
+
+            new_smpl_size = total_pcm_bytes
+            if new_smpl_size % 2 == 1:
+                new_smpl_size += 1
+            old_padded = smpl_old_size + (1 if smpl_old_size % 2 == 1 else 0)
+            delta = new_smpl_size - old_padded
+
+            out = bytearray()
+            out.extend(data[:smpl_head_off])
+            out.extend(b"smpl")
+            out.extend(struct.pack("<I", new_smpl_size))
+            for part in pcm_parts:
+                out.extend(part)
+            if total_pcm_bytes % 2 == 1:
+                out.extend(b"\x00")
+            rest_off = smpl_head_off + 8 + old_padded
+            rest = bytearray(data[rest_off:])
+            shdr_in_rest = shdr_data_off - rest_off
+            if shdr_in_rest < 0 or shdr_in_rest + shdr_size > len(rest):
+                logger.warning("shdr not found after smpl chunk")
+                return sf3_path
+            rest[shdr_in_rest:shdr_in_rest + shdr_size] = new_shdr
+            out.extend(rest)
+
+            data_out = bytes(out)
+
+            # Back to SF2 version 2.01
+            if ifil_abs is not None and ifil_abs + 4 <= len(data_out):
+                data_out = data_out[:ifil_abs] + struct.pack("<HH", 2, 1) + data_out[ifil_abs + 4:]
+
+            sdta = _find_list_of_type(data_out, b"sdta", 12)
+            if sdta:
+                lh_off, _, lh_size, ld_off = sdta
+                data_out = _update_size(data_out, lh_off + 4, lh_size + delta)
+
+            data_out = _update_size(data_out, 4, len(data_out) - 8)
+
+            sf2_path = sf2_path or (os.path.splitext(sf3_path)[0] + ".sf2")
+            with open(sf2_path, "wb") as fout:
+                fout.write(data_out)
+            logger.info(f"Converted SF3 -> SF2: {sf2_path} ({os.path.getsize(sf2_path) / 1048576:.1f} MB)")
+            return sf2_path
+        finally:
+            try:
+                import shutil
+                shutil.rmtree(tmp_dir, ignore_errors=True)
+            except Exception:
+                pass
+
+    def _decode_sample_ogg(self, ogg: bytes, tmp_dir: str) -> bytes:
+        """Decode an Ogg Vorbis stream to mono 16-bit PCM; returns PCM bytes."""
+        tmp_ogg = os.path.join(tmp_dir, "sample.ogg")
+        tmp_pcm = os.path.join(tmp_dir, "sample.pcm")
+        try:
+            with open(tmp_ogg, "wb") as fo:
+                fo.write(ogg)
+            r = subprocess.run(
+                ["ffmpeg", "-y", "-v", "error", "-i", tmp_ogg, "-f", "s16le", "-ac", "1", tmp_pcm],
+                capture_output=True, timeout=600)
+            if r.returncode != 0:
+                logger.warning(f"OGG decode failed: {r.stderr.decode(errors='replace')[:120]}")
+                return b""
+            with open(tmp_pcm, "rb") as fp:
+                return fp.read()
+        except Exception as e:
+            logger.warning(f"OGG decode error: {e}")
+            return b""
+        finally:
+            for p in [tmp_ogg, tmp_pcm]:
+                try:
+                    if os.path.exists(p):
+                        os.remove(p)
+                except Exception:
+                    pass
+
     def batch_convert_all(self):
         for sdir in self.target_dirs:
             if not os.path.isdir(sdir):
@@ -249,3 +548,4 @@ class SoundFontConverter:
             for fname in sorted(os.listdir(sdir)):
                 if fname.lower().endswith(".sf2"):
                     self.convert_sf2_to_sf3(os.path.join(sdir, fname))
+

app/core/vst_engine.py

@@ -2,7 +2,7 @@
 import os
 import numpy as np
 import functools
-from ctypes import c_int, c_char_p, c_void_p
+from ctypes import c_char_p
 
 def midi_note_to_freq(note_number: int) -> float:
     return 440.0 * (2.0 ** ((note_number - 69) / 12.0))
@@ -110,7 +110,12 @@ def get_plugin_manager(vst_dir="/opt/daw_engine/vst3", sf_dir="/opt/daw_engine/s
     return _PLUGIN_MANAGER_INSTANCE
 
 def load_soundfont_cached(path: str):
-    """Return a cached FluidSynth instance for path, incrementing refcount."""
+    """Return a cached low-level FluidSynth instance for path, incrementing refcount.
+
+    Uses the CFFI binding API (new_fluid_synth / fluid_synth_sfload) — the same
+    API render_engine relies on. The high-level `FluidSynth()`/`Synth()` classes
+    do not exist in this binding, so they are never used here.
+    """
     global _FLUID_CACHE
     if not HAS_PYFLUIDSYNTH:
         return None
@@ -119,10 +124,15 @@ def load_soundfont_cached(path: str):
         _FLUID_CACHE[path] = (fl, ref + 1)
         return fl
     try:
-        import fluidsynth
-        fl = fluidsynth.FluidSynth(sample_rate=44100, gain=0.5)
-        font_id = fl.sfload(path)
-        fl.program_select(0, font_id, 0, 0)
+        import fluidsynth as _fs
+        _settings = _fs.new_fluid_settings()
+        _fs.fluid_settings_setnum(_settings, b'synth.sample-rate', 44100.0)
+        fl = _fs.new_fluid_synth(_settings)
+        font_id = _fs.fluid_synth_sfload(fl, path.encode("utf-8"), 1)
+        if font_id < 0:
+            _fs.delete_fluid_synth(fl)
+            return None
+        _fs.fluid_synth_program_select(fl, 0, font_id, 0, 0)
         _FLUID_CACHE[path] = (fl, 1)
         return fl
     except Exception:
@@ -136,7 +146,8 @@ def release_soundfont(path: str):
     fl, ref = _FLUID_CACHE[path]
     if ref <= 1:
         try:
-            fl.delete()
+            import fluidsynth as _fs
+            _fs.delete_fluid_synth(fl)
         except Exception:
             pass
         del _FLUID_CACHE[path]
@@ -245,38 +256,47 @@ class PluginManager:
                 if base == sf_id or base == sf_id.replace("sf_", ""):
                     path = os.path.join(d, f)
                     try:
-                        import fluidsynth
-                        fl = fluidsynth.Synth()
-                        fid = fl.sfload(path)
-                        if fid < 0:
-                            fl.delete()
-                            continue
-                        presets = []
-                        _fl = fluidsynth._fl
-                        _fl.fluid_synth_get_sfont_by_id.restype = c_void_p
-                        _fl.fluid_preset_get_name.restype = c_char_p
-                        _fl.fluid_sfont_get_preset.restype = c_void_p
-                        sfont_ptr = _fl.fluid_synth_get_sfont_by_id(c_void_p(fl.synth), c_int(fid))
-                        if sfont_ptr:
-                            for bank in range(0, 2):
-                                for prog_num in range(0, 128):
-                                    try:
-                                        preset = fluidsynth.fluid_sfont_get_preset(sfont_ptr, c_int(bank), c_int(prog_num))
-                                    except Exception:
-                                        break
-                                    if preset:
-                                        name_ptr = fluidsynth.fluid_preset_get_name(preset)
-                                        if name_ptr:
-                                            name_val = c_char_p(name_ptr).value
-                                            if name_val:
-                                                presets.append({
-                                                    "bank": bank,
-                                                    "program": prog_num,
-                                                    "name": name_val.decode("utf-8", errors="replace")
-                                                })
-                        fl.delete()
-                        _SF_INSTRUMENTS_CACHE[sf_id] = presets[:256]
-                        return presets[:256]
+                        import fluidsynth as _fs
+                        # Low-level CFFI API (same as render_engine); never use
+                        # the high-level Synth() class that this binding lacks.
+                        _settings = _fs.new_fluid_settings()
+                        _synth = _fs.new_fluid_synth(_settings)
+                        try:
+                            fid = _fs.fluid_synth_sfload(_synth, path.encode("utf-8"), 1)
+                            if fid < 0:
+                                continue
+                            sfont = _fs.fluid_synth_get_sfont_by_id(_synth, fid)
+                            presets = []
+                            if sfont:
+                                for bank in range(0, 2):
+                                    for prog_num in range(0, 128):
+                                        try:
+                                            preset = _fs.fluid_sfont_get_preset(sfont, bank, prog_num)
+                                        except Exception:
+                                            break
+                                        if preset:
+                                            try:
+                                                name_ptr = _fs.fluid_preset_get_name(preset)
+                                                if name_ptr:
+                                                    if hasattr(_fs, "ffi"):
+                                                        raw = _fs.ffi.string(name_ptr)
+                                                    else:
+                                                        raw = c_char_p(name_ptr).value
+                                                    if raw:
+                                                        presets.append({
+                                                            "bank": bank,
+                                                            "program": prog_num,
+                                                            "name": raw.decode("utf-8", errors="replace")
+                                                        })
+                                            except Exception:
+                                                continue
+                            _SF_INSTRUMENTS_CACHE[sf_id] = presets[:256]
+                            return presets[:256]
+                        finally:
+                            try:
+                                _fs.delete_fluid_synth(_synth)
+                            except Exception:
+                                pass
                     except Exception:
                         import traceback; traceback.print_exc()
         _SF_INSTRUMENTS_CACHE[sf_id] = []

app/main.py

@@ -1,8 +1,11 @@
-import os, threading
+import os
+from contextlib import asynccontextmanager
+
 from fastapi import FastAPI
-from fastapi.responses import HTMLResponse
+from fastapi.responses import HTMLResponse, FileResponse
 from fastapi.staticfiles import StaticFiles
 from fastapi.middleware.cors import CORSMiddleware
+from fastapi.middleware.gzip import GZipMiddleware
 from app.config import settings
 from app.api.v1.audio import router as audio_router
 from app.api.v1.tasks import router as tasks_router
@@ -14,24 +17,40 @@ from app.api.v1.user_config import router as user_config_router
 from app.api.v1.ai_proxy import router as ai_proxy_router
 from app.api.v1.ai_presets import router as ai_presets_router
 from app.api.v1.plugins import router as plugins_router
+from app.api.v1.media import router as media_router
 from app.core.auth import seed_admin
-from app.core.soundfont_converter import SoundFontConverter
 from app.core.soundfont_scanner import SoundFontAutoScanner
 
 # Ensure storage directories exist
 os.makedirs(settings.UPLOADS_DIR, exist_ok=True)
 os.makedirs(settings.PROCESSED_DIR, exist_ok=True)
 
-app = FastAPI(title="SonicForge API Engine")
+_SF_SCANNER_STOP = None
 
-from fastapi.middleware.gzip import GZipMiddleware
+
+@asynccontextmanager
+async def lifespan(app: FastAPI):
+    # Startup
+    seed_admin()
+    scanner = SoundFontAutoScanner()
+    global _SF_SCANNER_STOP
+    _SF_SCANNER_STOP = scanner.start_background(interval=30)
+    yield
+    # Shutdown
+    if _SF_SCANNER_STOP is not None:
+        _SF_SCANNER_STOP.set()
+
+
+app = FastAPI(title="SonicForge API Engine", lifespan=lifespan)
 
 app.add_middleware(GZipMiddleware, minimum_size=500)
 
+# Auth is token/cookie based (no cookies required for CORS), so credentials are
+# disabled — "*" + allow_credentials=True is rejected by browsers anyway.
 app.add_middleware(
     CORSMiddleware,
     allow_origins=["*"],
-    allow_credentials=True,
+    allow_credentials=False,
     allow_methods=["*"],
     allow_headers=["*"],
 )
@@ -53,25 +72,8 @@ app.include_router(user_config_router, prefix="/api/v1/user", tags=["user_config
 app.include_router(ai_proxy_router, prefix="/api/v1/ai", tags=["ai"])
 app.include_router(ai_presets_router, prefix="/api/v1/ai", tags=["ai"])
 app.include_router(plugins_router, prefix="/api/v1/plugins", tags=["plugins"])
+app.include_router(media_router, prefix="/api/v1/media", tags=["media"])
 
-# Seed admin user on startup
-@app.on_event("startup")
-async def startup_seed_admin():
-    seed_admin()
-
-@app.on_event("startup")
-async def startup_convert_soundfonts():
-    def _run():
-        try:
-            SoundFontConverter().batch_convert_all()
-        except Exception as e:
-            print(f"[Startup] SoundFont conversion error: {e}")
-    threading.Thread(target=_run, daemon=True).start()
-
-@app.on_event("startup")
-async def startup_sf_scanner():
-    scanner = SoundFontAutoScanner()
-    scanner.start_background(interval=30)
 
 @app.get("/", response_class=HTMLResponse)
 async def get_index():
@@ -79,14 +81,18 @@ async def get_index():
     if not os.path.exists(index_path):
         return HTMLResponse(content=f"<h1>SonicForge Studio: index.html not found at {index_path}</h1>", status_code=404)
     with open(index_path, "r", encoding="utf-8") as file:
-        return HTMLResponse(content=file.read(), status_code=200)
+        resp = HTMLResponse(content=file.read(), status_code=200)
+        # no-cache: index.html PHẢI luôn mới (các bundle JS dùng ?v= để bust) —
+        # nếu browser cache HTML cũ → stamp cũ → tải bundle cũ (bug "không load
+        # được bundle mới" ở incognito — cache heuristic không có Cache-Control).
+        resp.headers["Cache-Control"] = "no-cache, no-store, must-revalidate"
+        return resp
+
 
 @app.get("/favicon.svg")
 async def get_favicon():
-    import os
     favicon_path = os.path.join(settings.TEMPLATES_DIR, "favicon.svg")
     if os.path.exists(favicon_path):
-        from fastapi.responses import FileResponse
         return FileResponse(favicon_path, media_type="image/svg+xml")
     return HTMLResponse(content="", status_code=404)
 

app/models/project_schema.json

@@ -45,6 +45,7 @@
         "id": { "type": "string" },
         "name": { "type": "string" },
         "type": { "type": "string", "enum": ["AUDIO", "MIDI", "SECTION"] },
+        "color": { "type": ["string", "null"], "default": null },
         "volume_db": { "type": "number", "default": 0.0 },
         "pan": { "type": "number", "minimum": -1.0, "maximum": 1.0, "default": 0.0 },
         "mute": { "type": "boolean", "default": false },

app/models/user.py

@@ -5,12 +5,18 @@ import time
 from typing import Optional, Dict, Any, List
 from app.config import settings
 
-DB_PATH = os.path.join(settings.STORAGE_DIR, "sonicforge.db")
+# Default DB lives in storage/; tests override via SONICFORGE_DB_PATH so the
+# dev database is never touched by the test suite.
+DB_PATH = os.getenv("SONICFORGE_DB_PATH") or os.path.join(settings.STORAGE_DIR, "sonicforge.db")
 
 def get_db_connection():
     os.makedirs(settings.STORAGE_DIR, exist_ok=True)
     conn = sqlite3.connect(DB_PATH)
     conn.row_factory = sqlite3.Row
+    # WAL improves concurrent read/write; FK enforcement makes quota/backup
+    # cleanup consistent when users are deleted.
+    conn.execute("PRAGMA journal_mode=WAL")
+    conn.execute("PRAGMA foreign_keys=ON")
     return conn
 
 def init_db():
@@ -89,6 +95,16 @@ def init_db():
     );
     """)
     
+    # Placeholder user for anonymous autosave: projects are saved with
+    # user_id='anonymous' when no token is present, so the FK must resolve.
+    cursor.execute("SELECT id FROM users WHERE id = 'anonymous'")
+    if not cursor.fetchone():
+        import secrets as _secrets
+        cursor.execute("""
+        INSERT OR IGNORE INTO users (id, username, email, hashed_password, role, must_change_password, created_at, is_active)
+        VALUES ('anonymous', 'anonymous', 'anonymous@local', ?, 'standard', 0, ?, 0)
+        """, (_secrets.token_hex(32), time.time()))
+    
     conn.commit()
     conn.close()
     

app/static/js/services/aiGateway.js

@@ -121,6 +121,57 @@ const AIGateway = (function() {
     }
   };
 
+  // ai_midi_rearrange_specification.md §3 — Function Tool Schema hỗ trợ 2 mode:
+  // SIMILAR_VARIATION (biến tấu cùng độ dài) / EXTEND_CONTINUATION (viết tiếp
+  // các bar sau). AI trả gói dữ liệu có vị trí target trên Timeline.
+  const REARRANGE_EXTEND_TOOL_SPEC = {
+    type: 'function',
+    function: {
+      name: 'rearrange_or_extend_midi_melody',
+      description: 'Analyzes source MIDI melody data and returns either a variation (Variation) or continuation (Extend) based on user instructions.',
+      parameters: {
+        type: 'object',
+        properties: {
+          mode: {
+            type: 'string',
+            enum: ['SIMILAR_VARIATION', 'EXTEND_CONTINUATION'],
+            description: "Mode: 'SIMILAR_VARIATION' (new arrangement of equal length) or 'EXTEND_CONTINUATION' (writes subsequent bars)."
+          },
+          composition_title: {
+            type: 'string',
+            description: 'Short title describing the new melody style (e.g., Jazz Swing Variation, Epic Extension Part 2)'
+          },
+          target_start_bar: {
+            type: 'number',
+            description: 'Starting bar number for the generated notes on the Timeline'
+          },
+          target_duration_bars: {
+            type: 'number',
+            description: 'Total bar duration covered by the generated sequence'
+          },
+          soundfont_id: { type: 'string', default: 'generaluser_gs' },
+          soundfont_bank: { type: 'integer', default: 0 },
+          soundfont_program: { type: 'integer', default: 0 },
+          generated_notes: {
+            type: 'array',
+            description: 'Array of AI-generated MIDI notes.',
+            items: {
+              type: 'object',
+              properties: {
+                pitch: { type: 'integer', minimum: 0, maximum: 127 },
+                start_beat: { type: 'number', description: 'Starting beat position relative to beat 0.0 of the generated item' },
+                duration_beats: { type: 'number', minimum: 0.1 },
+                velocity: { type: 'number', minimum: 0.0, maximum: 1.0 }
+              },
+              required: ['pitch', 'start_beat', 'duration_beats', 'velocity']
+            }
+          }
+        },
+        required: ['mode', 'composition_title', 'target_start_bar', 'target_duration_bars', 'generated_notes']
+      }
+    }
+  };
+
   const REARRANGE_SCENARIOS = [
     {
       id: 'arpeggio',
@@ -275,7 +326,10 @@ ${rules.join('\n')}` },
     } else {
       response = await fetch(`${origin}/api/v1/ai/proxy`, {
         method: 'POST',
-        headers: { 'Content-Type': 'application/json' },
+        headers: {
+          'Content-Type': 'application/json',
+          ...(localStorage.getItem('sonic_token') ? { 'X-Auth-Token': localStorage.getItem('sonic_token') } : {})
+        },
         body: JSON.stringify({ url, headers, body })
       });
     }
@@ -453,6 +507,7 @@ Ví dụ: "Hãy chọn và copy từ bar 4 đến bar 12 của track 1 sau đó
   return {
     DEFAULT_TOOLS,
     REARRANGE_TOOL_SPEC,
+    REARRANGE_EXTEND_TOOL_SPEC,
     REARRANGE_SCENARIOS,
     detectRearrangeScenario,
     buildRearrangeMessage,

app/static/js/services/ghostNoteExtractor.js

@@ -23,6 +23,7 @@
       if (!track.midiItems || !track.midiItems.length) continue;
       if (track.muted) continue;
 
+      var isSameTrack = track.id === targetTrackId;
       var trackGhostNotes = [];
 
       for (var j = 0; j < track.midiItems.length; j++) {
@@ -32,7 +33,10 @@
         var itemStartBeat = item.startTime / secondsPerBeat;
         var itemEndBeat = (item.startTime + item.duration) / secondsPerBeat;
 
-        if (itemStartBeat >= windowEndBeat || itemEndBeat < windowStartBeat) continue;
+        // Same-track items always contribute notes (show whole track); cross-track only when overlapping the window
+        if (itemStartBeat >= windowEndBeat || itemEndBeat < windowStartBeat) {
+          if (!isSameTrack) continue;
+        }
 
         var notes = item.notes || [];
         for (var k = 0; k < notes.length; k++) {
@@ -40,7 +44,7 @@
           var noteAbsStart = itemStartBeat + (note.start_beat || 0);
           var noteAbsEnd = noteAbsStart + (note.duration_beats || 1);
 
-          if (noteAbsStart >= windowEndBeat) continue;
+          if (noteAbsStart >= windowEndBeat && !isSameTrack) continue;
 
           trackGhostNotes.push({
             id: 'ghost_' + (note.id || Math.random().toString(36).substr(2, 9)),
@@ -48,6 +52,7 @@
             relative_start_beat: noteAbsStart - windowStartBeat,
             duration_beats: (note.duration_beats || 1),
             velocity: note.velocity,
+            item_id: item.id,
             original_track_name: track.name,
             original_track_color: track.color || '#888888'
           });
@@ -59,6 +64,7 @@
           track_id: track.id,
           track_name: track.name,
           track_color: track.color || '#6b7280',
+          isSameTrack: isSameTrack,
           notes: trackGhostNotes
         });
       }

app/static/js/services/soundfontPlayer.js

@@ -1,6 +1,6 @@
 (function () {
     const RENDER_BLOCK = 512;
-    const QUEUE_TARGET = 4;
+    const QUEUE_TARGET = 16;
     let _audioCtx = null;
     let _fluidModule = null;
     let _synthPtr = null;
@@ -22,14 +22,21 @@
     let _loadedFonts = {};
     let _activeOscillators = {};
     let _gainNode = null;
+    let _pendingOutputDestination = null;
+    let _outputDestination = null; // cache đích route — dedupe swap dư giữa stream
+    let _validPercCache = {};      // { sfId: [bank, prog] | null } — preset percussion hợp lệ
+    let _sfLoadFailAt = {};        // { sfId: timestamp } — cooldown 10s sau load fail
     let _scheduledNotes = [];
+    let _loadPromises = {};
+    let _sfloadSeq = 0;
 
     const getCtx = function () {
         if (_audioCtx) {
             if (!_gainNode) {
                 _gainNode = _audioCtx.createGain();
                 _gainNode.gain.value = 0.3;
-                _gainNode.connect(window.masterBus ? window.masterBus.input : _audioCtx.destination);
+                _outputDestination = _pendingOutputDestination || (window.masterBus ? window.masterBus.input : _audioCtx.destination);
+                _gainNode.connect(_outputDestination);
             }
             return _audioCtx;
         }
@@ -38,7 +45,8 @@
             if (!_gainNode) {
                 _gainNode = ctx.createGain();
                 _gainNode.gain.value = 0.3;
-                _gainNode.connect(window.masterBus ? window.masterBus.input : ctx.destination);
+                _outputDestination = _pendingOutputDestination || (window.masterBus ? window.masterBus.input : ctx.destination);
+                _gainNode.connect(_outputDestination);
             }
             return ctx;
         }
@@ -51,7 +59,8 @@
         if (!_gainNode) {
             _gainNode = window.__sharedAudioCtx.createGain();
             _gainNode.gain.value = 0.3;
-            _gainNode.connect(window.__sharedAudioCtx.destination);
+            _outputDestination = _pendingOutputDestination || window.__sharedAudioCtx.destination;
+            _gainNode.connect(_outputDestination);
         }
         return window.__sharedAudioCtx;
     };
@@ -59,6 +68,36 @@
     const SonicSF = {
         loadedFonts: _loadedFonts,
 
+        // Route the shared FluidSynth output through a per-track node (e.g. the
+        // track's gainNode) so the track's FX chain / fader / pan affect the
+        // soundfont instrument. Pass null to restore the default master-bus route.
+        setOutputDestination: function (node) {
+            try {
+                if (_gainNode) {
+                    const dest = node || (window.masterBus ? window.masterBus.input : ((_audioCtx || window.__sharedAudioCtx).destination));
+                    // DEDUPE: đích không đổi → KHÔNG disconnect/reconnect.
+                    // Swap dư giữa dòng notes đang phát (applyAllTrackMuteSolo →
+                    // updateSfRouting gọi lại cùng đích sfEntry sau noteon đầu)
+                    // làm ScriptProcessor xuất buffer uninitialized → NaN →
+                    // 11 biquad "state is bad" → CÂM (mọi log: state-bad nổ
+                    // ngay sau setOutputDestination lần 2).
+                    if (dest === _outputDestination) return;
+                    _gainNode.disconnect();
+                    _gainNode.connect(dest);
+                    _outputDestination = dest;
+                    console.log('[SonicSF] setOutputDestination to:', node ? 'track node (sfEntry)' : 'masterBus.input');
+                } else {
+                    _pendingOutputDestination = node || null;
+                    console.log('[SonicSF] setOutputDestination pending:', node ? 'track node (sfEntry)' : 'null');
+                }
+            } catch (e) {
+                console.warn('[SonicSF] setOutputDestination error:', e);
+            }
+        },
+        getOutputNode: function () {
+            return _gainNode;
+        },
+
         init: async function (audioContext) {
             if (_initialized && _fluidModule) return;
             if (_initPromise) return _initPromise;
@@ -79,19 +118,27 @@
                     if (!_gainNode) {
                         _gainNode = _audioCtx.createGain();
                         _gainNode.gain.value = 0.3;
-                        _gainNode.connect(window.masterBus ? window.masterBus.input : _audioCtx.destination);
+                        _outputDestination = _pendingOutputDestination || (window.masterBus ? window.masterBus.input : _audioCtx.destination);
+                        _gainNode.connect(_outputDestination);
                     }
 
                     console.log("[SonicSF] AudioCtx state:", _audioCtx.state, "sampleRate:", _audioCtx.sampleRate);
 
+                    // ── Renderer selection ──
+                    // ScriptProcessor is the default and FINAL choice: it is
+                    // pull-based (onaudioprocess is invoked by the audio thread),
+                    // so it cannot starve when the main thread is busy (font
+                    // loading, WASM decode, UI). The AudioWorklet push model
+                    // (setInterval on the main thread) starves under load and
+                    // produces SILENCE on this machine — repeatedly confirmed.
+                    // The deprecation console warning is purely cosmetic.
                     var _useScriptNode = true;
                     try {
-                        await _audioCtx.audioWorklet.addModule('/static/js/worklets/fluidsynth-bridge.js');
-                        console.log("[SonicSF] Worklet registered OK");
+                        await _audioCtx.audioWorklet.addModule('/static/js/worklets/fluidsynth-bridge.js?v=202608031240');
+                        console.log("[SonicSF] Worklet registered OK (unused)");
                     } catch (e) {
                         console.warn("[SonicSF] Worklet reg failed:", e);
                     }
-                    console.log("[SonicSF] Using ScriptProcessorNode (forced for debug)");
 
                     console.log("[SonicSF] Initializing FluidSynth WASM Engine...");
                     var TOTAL_MEMORY = 256 * 1024 * 1024;
@@ -104,6 +151,11 @@
                         },
                         TOTAL_MEMORY: TOTAL_MEMORY,
                         printErr: function (msg) {
+                            // "No preset found on channel" is FluidSynth's
+                            // expected notice when a soundfont simply has no
+                            // preset for a bank (e.g. bank 128 on a melodic-only
+                            // font) — the note is just silent, not an error.
+                            if (msg && (msg.indexOf('No preset found on channel') !== -1 || msg.indexOf('There is no preset with bank number') !== -1)) return;
                             console.warn('[FluidSynth:err]', msg);
                         }
                     });
@@ -114,9 +166,9 @@
 
                     _settingsPtr = _fluidModule._new_fluid_settings();
                     _fluidModule._fluid_settings_setnum(_settingsPtr, "synth.sample-rate", _audioCtx.sampleRate || 44100);
-                    _fluidModule._fluid_settings_setnum(_settingsPtr, "synth.gain", 2.0);
+                    _fluidModule._fluid_settings_setnum(_settingsPtr, "synth.gain", 1.0);
                     _fluidModule._fluid_settings_setnum(_settingsPtr, "synth.polyphony", 256);
-                    _fluidModule._fluid_settings_setint(_settingsPtr, "synth.verbose", 1);
+                    _fluidModule._fluid_settings_setint(_settingsPtr, "synth.verbose", 0);
                     _fluidModule._fluid_settings_setint(_settingsPtr, "synth.ladspa.active", 0);
                     _fluidModule._fluid_settings_setstr(_settingsPtr, "player.timing-source", "audio");
                     console.log("[SonicSF] FluidSynth settings configured");
@@ -132,7 +184,15 @@
 
                     if (!_useScriptNode) {
                         try {
-                            _workletNode = new AudioWorkletNode(_audioCtx, 'fluidsynth-bridge');
+                            // Force stereo output regardless of the device's
+                            // channel count — FluidSynth renders stereo, and a
+                            // mono output would crash the worklet (out[1] undefined).
+                            _workletNode = new AudioWorkletNode(_audioCtx, 'fluidsynth-bridge', {
+                                numberOfOutputs: 1,
+                                outputChannelCount: [2],
+                                channelCount: 2,
+                                channelCountMode: 'explicit'
+                            });
                             _workletNode.connect(_gainNode);
                             console.log("[SonicSF] AudioWorklet node connected via gain");
                             _startRenderLoop();
@@ -146,17 +206,31 @@
                         var spn = _audioCtx.createScriptProcessor(spBufSz, 0, 2);
                         var lp = _fluidModule._malloc(spBufSz * 4);
                         var rp = _fluidModule._malloc(spBufSz * 4);
+                        // Heap WASM có thể realloc khi load SoundFont lớn (SGM-V2.01
+                        // ~300MB) → lp/rp DANGLE → đọc vùng nhớ đã free → NaN/garbage
+                        // → master chain "state is bad" → CÂM + stuck. Theo dõi
+                        // buffer + re-malloc khi đổi.
+                        var _heapBufRef = _fluidModule.HEAPU8.buffer;
                         spn.onaudioprocess = function (e) {
                             var left = e.outputBuffer.getChannelData(0);
                             var right = e.outputBuffer.getChannelData(1);
                             var sz = left.length;
                             try {
+                                if (_fluidModule.HEAPU8.buffer !== _heapBufRef) {
+                                    try { _fluidModule._free(lp); _fluidModule._free(rp); } catch (er2) {}
+                                    lp = _fluidModule._malloc(sz * 4);
+                                    rp = _fluidModule._malloc(sz * 4);
+                                    _heapBufRef = _fluidModule.HEAPU8.buffer;
+                                }
                                 _fluidModule._fluid_synth_write_float(_synthPtr, sz, lp, 0, 1, rp, 0, 1);
                                 var hf = _fluidModule.HEAPF32;
                                 var lpb = lp >> 2, rpb = rp >> 2;
                                 for (var si = 0; si < sz; si++) {
-                                    left[si] = hf[lpb + si];
-                                    right[si] = hf[rpb + si];
+                                    // NaN sweep: mẫu NaN/Inf → 0 (chain biquad
+                                    // KHÔNG BAO GIỜ được nhận NaN → không state-bad).
+                                    var L = hf[lpb + si], R = hf[rpb + si];
+                                    left[si] = isFinite(L) ? L : 0;
+                                    right[si] = isFinite(R) ? R : 0;
                                 }
                             } catch (er) {}
                         };
@@ -186,11 +260,16 @@
         },
 
         _tryLoadSFL: function (buf, ext) {
-            var fname = '/' + ext + '_' + Date.now();
+            var fname = '/' + ext + '_' + (++_sfloadSeq) + '_' + Date.now();
             try { _fluidModule.FS.unlink(fname); } catch (e) {}
             _fluidModule.FS.writeFile(fname, new Uint8Array(buf));
             var cPath = this._allocCStr(fname);
-            var handle = _fluidModule._fluid_synth_sfload(_synthPtr, cPath, 1);
+            // reset_presets = 0: loading a NEW soundfont must NOT reset the
+            // presets already selected on other channels. With 1, FluidSynth
+            // re-points every channel to the new font's preset 0, so loading a
+            // second instrument silently changes the first one's sound
+            // (decay/loop envelope…).
+            var handle = _fluidModule._fluid_synth_sfload(_synthPtr, cPath, 0);
             _fluidModule._free(cPath);
             try { _fluidModule.FS.unlink(fname); } catch (e) {}
             return handle;
@@ -203,19 +282,63 @@
                 _currentSfId = sfId;
                 return true;
             }
+            // Deduplicate concurrent loads: rapid key presses (or several armed
+            // tracks) all call loadSoundFont for the same font before the first
+            // load resolves. Without this, the same soundfont is sfload'd several
+            // times (handles 1,2,3,4…) — wasting the 256MB WASM heap and stalling
+            // notes until each load finishes (audible lag, then silence).
+            if (!_loadPromises[sfId]) {
+                _loadPromises[sfId] = this._doLoadSoundFont(sfId).then(function (ok) {
+                    // Do NOT cache failures: a transient error (network hiccup,
+                    // memory pressure) must not permanently kill the instrument —
+                    // the next note retries the load and recovers.
+                    if (!ok) delete _loadPromises[sfId];
+                    return ok;
+                });
+            }
+            return _loadPromises[sfId];
+        },
+
+        _doLoadSoundFont: async function (sfId) {
             try {
+                // KHÔNG unload SF cũ khi sfload SF mới: unload làm handle cũ
+                // thành rác trong khi channel state vẫn trỏ tới → program_select
+                // bị skip (progAlreadySet) → noteon trên handle đã unload →
+                // "Instrument not found ... substituted prog 0". Heap 256MB đủ
+                // cho vài SF (SGM + latin = 2 handle — log OK). SF cũ khi cần
+                // lại chỉ được sfload lại nếu map bị xóa (không xảy ra ở đây).
                 var cache = window.SonicSFStorage;
                 var buf = cache ? await cache.getBuffer(sfId) : null;
-                if (!buf) {
-                    var url = "/api/v1/plugins/soundfonts/download/" + encodeURIComponent(sfId) + "?t=" + Date.now();
-                    var resp = await fetch(url);
-                    if (!resp.ok) {
+                if (buf) {
+                    var cachedOk = this._tryLoadSFL(buf, '.sf3');
+                    if (cachedOk === -1) cachedOk = this._tryLoadSFL(buf, '.sf2');
+                    if (cachedOk !== -1) {
+                        _sfHandleMap.set(sfId, cachedOk);
+                        _currentSfId = sfId;
+                        _loadedFonts[sfId] = true;
+                        console.log("[SonicSF] SoundFont loaded from cache:", sfId, "handle:", cachedOk);
+                        return true;
+                    }
+                    // Stale/corrupt cache (e.g. old SF3 buffers the WASM can't
+                    // decode) — drop it and re-download from the server.
+                    console.warn("[SonicSF] Cached SoundFont unplayable, re-downloading:", sfId);
+                    try { await cache.saveBuffer(sfId, null); } catch (e2) {}
+                }
+                var url = "/api/v1/plugins/soundfonts/download/" + encodeURIComponent(sfId) + "?t=" + Date.now();
+                var resp = await fetch(url);
+                if (!resp.ok) {
+                    // Fallback: font bundled theo deployment (static/soundfonts —
+                    // serve qua /soundfonts/{f} — catalog default-soundfonts).
+                    var url2 = "/soundfonts/" + encodeURIComponent(sfId.replace(/^sf_/, '')) + "?t=" + Date.now();
+                    var resp2 = await fetch(url2);
+                    if (!resp2.ok) {
                         console.warn("[SonicSF] SoundFont not found:", sfId);
                         return false;
                     }
-                    buf = await resp.arrayBuffer();
-                    if (cache) await cache.saveBuffer(sfId, buf);
+                    resp = resp2;
                 }
+                buf = await resp.arrayBuffer();
+                if (cache) await cache.saveBuffer(sfId, buf);
                 var sfHandle = this._tryLoadSFL(buf, '.sf3');
                 if (sfHandle === -1) {
                     console.warn("[SonicSF] sfload .sf3 failed, trying .sf2 for", sfId);
@@ -245,16 +368,16 @@
                 if (!ok) return;
             }
             var engKey = (sfId || '') + ':' + bank + ':' + program;
-            if (!_engineChMap[engKey]) {
-                if (channel === undefined || channel === null) {
+            if (channel === undefined || channel === null) {
+                if (!_engineChMap[engKey]) {
                     var allocCh = this.allocateChannel(bank);
                     _engineChMap[engKey] = allocCh;
                     channel = allocCh;
                 } else {
-                    _engineChMap[engKey] = channel;
+                    channel = _engineChMap[engKey];
                 }
-            } else {
-                channel = _engineChMap[engKey];
+            } else if (!_engineChMap[engKey]) {
+                _engineChMap[engKey] = channel;
             }
             var sfHandle = _sfHandleMap.get(sfId);
             if (sfHandle !== undefined) {
@@ -371,10 +494,11 @@
         },
 
         _playNoteFluid: function (note, velocity, durationMs, startTime, program, channel, synthEngine) {
-            var midiPitch = Math.min(127, Math.max(0, parseInt(note) || 60));
-            var midiVel = Math.min(127, Math.max(1, Math.floor(
-                typeof velocity === 'number' ? (velocity > 1 ? velocity : velocity * 127) : 100
-            )));
+            var parsedPitch = parseInt(note);
+            var midiPitch = isNaN(parsedPitch) ? 60 : Math.min(127, Math.max(0, parsedPitch));
+            var rawVel = (typeof velocity === 'number' && isFinite(velocity)) ? (velocity > 1 ? velocity : velocity * 127) : 100;
+            if (isNaN(rawVel)) rawVel = 100;
+            var midiVel = Math.min(127, Math.max(1, Math.floor(rawVel)));
             var _origChannel = channel;
             var usedBank = 0, usedProg = 0;
             if (synthEngine) {
@@ -407,30 +531,99 @@
             var self = this;
             var doNote = function () {
                 try {
-                    var finalBank = usedBank;
-                    var finalProg = usedProg;
+                    var finalBank = parseInt(usedBank);
+                    if (isNaN(finalBank) || !isFinite(finalBank)) finalBank = 0;
+                    var finalProg = parseInt(usedProg);
+                    if (isNaN(finalProg) || !isFinite(finalProg)) finalProg = 0;
                     var finalSfId = synthEngine ? synthEngine.soundfont_id : undefined;
-                    if (_channels[ch] && _channels[ch].program !== undefined) {
-                        finalBank = _channels[ch].bank;
-                        finalProg = _channels[ch].program;
-                        if (_channels[ch].sfId !== undefined) {
-                            finalSfId = _channels[ch].sfId;
+                    var cachedCh = _channels[ch];
+                    // The note's own synth engine (track instrument) is
+                    // authoritative. Channel state is only a cache: it must never
+                    // mask the track's instrument, otherwise multi-track ARM or a
+                    // re-picked instrument plays the wrong soundfont. Without an
+                    // engine, fall back to the soundfont configured on the channel.
+                    if (!synthEngine && cachedCh && cachedCh.sfId !== undefined) {
+                        finalBank = parseInt(cachedCh.bank) || 0;
+                        finalProg = parseInt(cachedCh.program) || 0;
+                        finalSfId = cachedCh.sfId;
+                    }
+                    // Ensure the soundfont is actually loaded before the note plays.
+                    // Quick instrument pick on a track does not pre-load it, so load
+                    // lazily here and retry the note once the font is ready.
+                    if (finalSfId && !_sfHandleMap.has(finalSfId)) {
+                        // Cooldown lỗi: font 404 → KHÔNG spam fetch mỗi note (10s)
+                        // — note chạy thẳng fallback để CÓ ÂM.
+                        var _lastFail = _sfLoadFailAt[finalSfId] || 0;
+                        if (Date.now() - _lastFail < 10000) {
+                            try { self._playNoteFallback(note, velocity, durationMs, startTime, program, null, channel, synthEngine); } catch (e) {}
+                            return;
                         }
+                        console.log('[SonicSF] soundfont not loaded yet, loading:', finalSfId);
+                        self.loadSoundFont(finalSfId).then(function (ok) {
+                            console.log('[SonicSF] loadSoundFont result:', ok, 'for:', finalSfId);
+                            if (ok) {
+                                doNote();
+                            } else {
+                                // Font KHÔNG tải được (404/format) → KHÔNG drop note
+                                // câm lặng ("bỏ qua WASM") — fallback oscillator.
+                                _sfLoadFailAt[finalSfId] = Date.now();
+                                try { self._playNoteFallback(note, velocity, durationMs, startTime, program, null, channel, synthEngine); } catch (e) {}
+                            }
+                        });
+                        return;
                     }
                     // Program change at note time, not call time — ensures correct
                     // instrument for each item regardless of processing order.
-                    if (synthEngine || program !== undefined) {
+                    // Skip if the channel already has this exact instrument (avoids
+                    // per-note soundfont reloads that cause audible crackle/glitches).
+                    // ⚠️ Chỉ skip khi handle SF vẫn CÒN HỢP LỆ trong map — nếu
+                    // không → vẫn program_select lại (tránh dùng handle đã unload).
+                    var progAlreadySet = cachedCh && cachedCh.program === finalProg && cachedCh.bank === finalBank && cachedCh.sfId === finalSfId
+                        && (finalSfId ? _sfHandleMap.has(finalSfId) : true);
+                    if ((synthEngine || program !== undefined) && !progAlreadySet) {
                         var sfHandle = finalSfId ? _sfHandleMap.get(finalSfId) : undefined;
+                        console.log('[SonicSF] selectProgram for channel:', ch, 'sfHandle:', sfHandle, 'bank:', finalBank, 'prog:', finalProg);
                         if (sfHandle !== undefined) {
                             try {
-                                _fluidModule._fluid_synth_program_select(_synthPtr, ch, sfHandle, finalBank, finalProg);
+                                // Percussion (bank 128): tìm preset HỢP LỆ trong
+                                // font — quét bank 128 + bank 0 (0-127) MỘT LẦN,
+                                // cache theo sfId. Trước đây chỉ thử 4 preset cố
+                                // định → font không có → cache channel = (128,0)
+                                // INVALID → note sau skip re-select (progAlreadySet)
+                                // → noteon preset rỗng = CÂM ("1 âm đầu rồi câm").
+                                if (finalBank === 128) {
+                                    var _vKey = finalSfId || ('h' + sfHandle);
+                                    if (_validPercCache[_vKey] === undefined) {
+                                        var _found = null;
+                                        for (var _b = 0; _b < 2 && !_found; _b++) {
+                                            var _bk = _b === 0 ? 128 : 0;
+                                            for (var _p = 0; _p < 128 && !_found; _p++) {
+                                                try {
+                                                    if (_fluidModule._fluid_synth_program_select(_synthPtr, 9, sfHandle, _bk, _p) === 0) {
+                                                        _found = [_bk, _p];
+                                                    }
+                                                } catch (e) {}
+                                            }
+                                        }
+                                        _validPercCache[_vKey] = _found;
+                                    }
+                                    if (_validPercCache[_vKey]) {
+                                        finalBank = _validPercCache[_vKey][0];
+                                        finalProg = _validPercCache[_vKey][1];
+                                    }
+                                }
+                                var _selRet = _fluidModule._fluid_synth_program_select(_synthPtr, ch, sfHandle, finalBank, finalProg);
                             } catch (e) {}
                         } else {
                             try { _fluidModule._fluid_synth_bank_select(_synthPtr, ch, finalBank); } catch (e) {}
                             try { _fluidModule._fluid_synth_program_change(_synthPtr, ch, finalProg); } catch (e) {}
                         }
+                        if (!_channels[ch]) _channels[ch] = {};
+                        _channels[ch].bank = finalBank;
+                        _channels[ch].program = finalProg;
+                        _channels[ch].sfId = finalSfId;
                     }
-                    console.log("[SonicSF] noteOn ch:", ch, "pitch:", midiPitch, "vel:", midiVel);
+                    console.log('[SonicSF] noteon channel:', ch, 'pitch:', midiPitch, 'vel:', midiVel, 'sfId:', finalSfId);
                     _fluidModule._fluid_synth_noteon(_synthPtr, ch, midiPitch, midiVel);
                     var noteMapKey = (_origChannel !== undefined ? _origChannel : 0) + ':' + midiPitch;
                     if (!_activeNotes[noteMapKey]) _activeNotes[noteMapKey] = [];
@@ -446,7 +639,7 @@
                                     if (arr.length === 0) delete _activeNotes[noteMapKey];
                                 }
                             } catch (e) {}
-                        }, durSec * 1000);
+                        }, durationMs);
                     }
                 } catch (e) {
                     console.warn("[SonicSF] FluidSynth noteOn error:", e);
@@ -461,6 +654,31 @@
             }
         },
 
+        // Hủy mọi note-on được schedule (tương lai) + note-off mọi notes đang
+        // ngân — gọi khi STOP/PAUSE để hết "âm thanh bị stuck" (note-on chưa
+        // bắn vẫn bắn sau khi dừng; notes durationMs>=60000 không có note-off
+        // tự động → ngân vô hạn → VU master nhảy dù không play).
+        panic: function () {
+            _scheduledNotes.forEach(function (sn) { if (sn.on) { clearTimeout(sn.on); sn.on = null; } });
+            _scheduledNotes = [];
+            if (_initialized && _fluidModule) {
+                // noteoff TỪNG note đang ngân (binding _fluid_synth_noteoff chắc
+                // chắn tồn tại — đã dùng cho duration hết) — all_notes_off có
+                // thể không có trong WASM exports (catch nuốt → notes kẹt).
+                Object.keys(_activeNotes).forEach(function (key) {
+                    var parts = key.split(':');
+                    var pitch = parseInt(parts[1], 10);
+                    (_activeNotes[key] || []).forEach(function (ch) {
+                        try { _fluidModule._fluid_synth_noteoff(_synthPtr, ch, pitch); } catch (e) {}
+                    });
+                });
+                try {
+                    for (var c = 0; c < 16; c++) _fluidModule._fluid_synth_all_notes_off(_synthPtr, c);
+                } catch (e) {}
+            }
+            _activeNotes = {};
+        },
+
         _playNoteFallback: function (note, velocity, durationMs, startTime, program, destinationNode, channel, synthEngine) {
             var ctx = getCtx();
             var freq = 440 * Math.pow(2, (note - 69) / 12);
@@ -477,7 +695,11 @@
             var oscType = 'triangle';
             var attackTime = 0.03, decayTime = 0.1, sustainLevel = 0.5, releaseTime = 0.2, volFactor = 0.25;
             var prog = program !== undefined ? parseInt(program) : 0;
-            if (channel !== undefined && channel >= 0 && channel < 16) {
+            // CHỈ dùng cache channel khi KHÔNG có program/synthEngine được
+            // truyền — trước đây override program của track bằng cache channel
+            // (bị track khác cùng channel ghi đè → preview note vẽ mới mang
+            // nhạc cụ của track TRƯỚC).
+            if (program === undefined && channel !== undefined && channel >= 0 && channel < 16) {
                 prog = _channels[channel].program || prog;
             }
             if (prog >= 0 && prog <= 7) { oscType = 'sine'; decayTime = 0.3; sustainLevel = 0.1; releaseTime = 0.2; }
@@ -495,7 +717,8 @@
             osc.frequency.setValueAtTime(freq, 0);
             var startAt = startTime !== undefined ? startTime : ctx.currentTime;
             var durSec = durationMs / 1000;
-            var vel = typeof velocity === 'number' ? (velocity > 1 ? velocity / 127 : velocity) : 0.8;
+            var vel = (typeof velocity === 'number' && isFinite(velocity) && !isNaN(velocity)) ? (velocity > 1 ? velocity / 127 : velocity) : 0.8;
+            if (isNaN(vel)) vel = 0.8;
             var targetGain = vel * volFactor;
             noteGain.gain.setValueAtTime(0, startAt);
             noteGain.gain.linearRampToValueAtTime(targetGain, startAt + attackTime);
@@ -516,9 +739,17 @@
 
         stopAll: function () {
             if (_initialized && _fluidModule) {
+                // noteoff từng note đang ngân (binding chắc chắn tồn tại) —
+                // phòng all_notes_off không có trong WASM exports.
+                Object.keys(_activeNotes).forEach(function (key) {
+                    var parts = key.split(':');
+                    var pitch = parseInt(parts[1], 10);
+                    (_activeNotes[key] || []).forEach(function (ch) {
+                        try { _fluidModule._fluid_synth_noteoff(_synthPtr, ch, pitch); } catch (e) {}
+                    });
+                });
                 for (var ch = 0; ch < 16; ch++) {
                     try { _fluidModule._fluid_synth_all_notes_off(_synthPtr, ch); } catch (e) {}
-                    try { _fluidModule._fluid_synth_all_sounds_off(_synthPtr, ch); } catch (e) {}
                 }
             }
             while (_scheduledNotes.length > 0) {
@@ -535,6 +766,7 @@
                 } catch (e) {}
             });
             Object.keys(_activeOscillators).forEach(function (k) { delete _activeOscillators[k]; });
+            _activeNotes = {};
         },
 
         saveToIndexedDB: async function (name, arrayBuffer) {
@@ -559,10 +791,13 @@
         var leftPtr = _leftBufPtr;
         var rightPtr = _rightBufPtr;
         var block = RENDER_BLOCK;
-        var queueDepth = 0;
         var maxQueue = QUEUE_TARGET;
+        var queueDepth = 0;
+        var lastTick = performance.now();
+        var frameMs = (block / _audioCtx.sampleRate) * 1000;
 
-        var _dbgPeak = 0;
+        // Track consumption by wall-clock time instead of async messages — immune
+        // to message-latency races that could underrun (silence gaps → crackle).
         function pushFrame() {
             if (!Module || !synth || !node) return;
             try {
@@ -573,18 +808,6 @@
                 Module._fluid_synth_write_float(synth, block, leftPtr, 0, 1, rightPtr, 0, 1);
                 var leftArr = new Float32Array(Module.HEAPF32.subarray(lpb, lpb + block));
                 var rightArr = new Float32Array(Module.HEAPF32.subarray(rpb, rpb + block));
-                var peak = 0;
-                var avg = 0;
-                for (var si = 0; si < leftArr.length; si++) {
-                    var abs = leftArr[si] > 0 ? leftArr[si] : -leftArr[si];
-                    if (abs > peak) peak = abs;
-                    avg += abs;
-                }
-                avg /= leftArr.length;
-                if (!_dbgPeak) {
-                    _dbgPeak = 1;
-                    console.log("[SonicSF] FRAME peak:", peak.toFixed(6), "avg:", avg.toFixed(8), "gain check:", Module._fluid_synth_get_gain ? Module._fluid_synth_get_gain(synth) : 'N/A');
-                }
                 node.port.postMessage({ type: 'PCM', L: leftArr, R: rightArr }, [leftArr.buffer, rightArr.buffer]);
                 queueDepth++;
             } catch (e) { console.warn("[SonicSF] pushFrame error:", e); }
@@ -595,14 +818,16 @@
                 _renderTimer = null;
                 return;
             }
-            var needed = maxQueue - queueDepth;
+            var now = performance.now();
+            queueDepth = Math.max(0, queueDepth - (now - lastTick) / frameMs);
+            lastTick = now;
+            var needed = Math.min(maxQueue - queueDepth, maxQueue);
             for (var i = 0; i < needed; i++) {
                 pushFrame();
             }
-            queueDepth = Math.max(0, queueDepth - 1);
         }
 
-        _renderTimer = setInterval(fillLoop, Math.max(8, (block / _audioCtx.sampleRate) * 1000 * 0.75));
+        _renderTimer = setInterval(fillLoop, Math.max(4, frameMs * 0.5));
     }
 
     function _stopRenderLoop() {

app/static/js/services/storage.js

@@ -60,11 +60,13 @@
     }
 
     let autoSaveTimer = null;
+    let lastGetProjectStateCallback = null;
     function scheduleTempAutoSave(getProjectStateCallback) {
+        if (getProjectStateCallback) lastGetProjectStateCallback = getProjectStateCallback;
         if (autoSaveTimer) clearTimeout(autoSaveTimer);
         autoSaveTimer = setTimeout(async () => {
             try {
-                const state = getProjectStateCallback();
+                const state = lastGetProjectStateCallback ? lastGetProjectStateCallback() : null;
                 if (!state || (!state.tracks && !state.main_session)) return;
                 const dataJson = JSON.stringify(state);
                 localStorage.setItem('sonic_temp_project', dataJson);
@@ -76,10 +78,26 @@
             }
         }, 2000);
     }
+    // Lưu NGAY (bỏ debounce 2s) — dùng cho thay đổi cần bền vững tức thì (đổi màu track)
+    async function flushTempAutoSave() {
+        if (autoSaveTimer) { clearTimeout(autoSaveTimer); autoSaveTimer = null; }
+        try {
+            const state = lastGetProjectStateCallback ? lastGetProjectStateCallback() : null;
+            if (!state || (!state.tracks && !state.main_session)) return;
+            const dataJson = JSON.stringify(state);
+            localStorage.setItem('sonic_temp_project', dataJson);
+            if (window.SonicAPI && localStorage.getItem('sonic_token')) {
+                await window.SonicAPI.saveTempProject(dataJson).catch(() => {});
+            }
+        } catch (e) {
+            console.warn("Flush temp project warning:", e);
+        }
+    }
 
     window.SonicStorage = {
         exportProjectToSFS,
         importProjectFromSFSFile,
-        scheduleTempAutoSave
+        scheduleTempAutoSave,
+        flushTempAutoSave
     };
 })();

app/static/js/worklets/fluidsynth-bridge.js

@@ -15,29 +15,28 @@ class FluidSynthBridge extends AudioWorkletProcessor {
 
   process(inputs, outputs) {
     const out = outputs[0];
-    if (!out) return true;
+    if (!out || out.length === 0) return true;
     this.called++;
+    const numCh = out.length;
     const len = out[0].length;
     const qL = this.leftQ;
     const qR = this.rightQ;
     let fi = 0;
     let si = 0;
+    // Handle any output channel count (mono devices produce 1 channel, so
+    // out[1] may be undefined — never write into a missing channel).
     for (let i = 0; i < len; i++) {
-      if (fi >= qL.length) { out[0][i] = 0; out[1][i] = 0; continue; }
-      out[0][i] = qL[fi][si];
-      out[1][i] = qR[fi][si];
+      if (fi >= qL.length) {
+        for (let c = 0; c < numCh; c++) out[c][i] = 0;
+        continue;
+      }
+      for (let c = 0; c < numCh; c++) {
+        out[c][i] = c % 2 === 0 ? qL[fi][si] : qR[fi][si];
+      }
       si++;
       if (si >= qL[fi].length) { fi++; si = 0; }
     }
     if (fi > 0) { this.leftQ.splice(0, fi); this.rightQ.splice(0, fi); }
-    if (this.called % 50 === 0) {
-      var pk = 0;
-      for (var j = 0; j < len; j++) {
-        var v = out[0][j] > 0 ? out[0][j] : -out[0][j];
-        if (v > pk) pk = v;
-      }
-      if (pk > 0) console.log('[FluidSynth:bridge] process #' + this.called + ' peak:' + pk.toFixed(6) + ' q:' + qL.length);
-    }
     return true;
   }
 }

app/storage/.secret_key

@@ -0,0 +1 @@
+8d26e2b55e73579d1bb3c37b4878f1845ef9cbf50a8e4ee6f7deaa2ab80db32d

app/templates/index.html

@@ -8,22 +8,23 @@
     <link rel="icon" type="image/svg+xml" href="/favicon.svg">
     <script src="https://cdn.tailwindcss.com"></script>
     <script src="https://unpkg.com/lucide@latest"></script>
+    <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.2/css/all.min.css" crossorigin="anonymous" referrerpolicy="no-referrer">
     <script src="https://unpkg.com/react@18.3.1/umd/react.production.min.js"></script>
     <script src="https://unpkg.com/react-dom@18.3.1/umd/react-dom.production.min.js"></script>
     <script src="/static/js/services/fluidsynthLoader.js?v=202607271245"></script>
     <script src="/static/js/services/api.js?v=202607271016"></script>
     <script src="/static/js/services/audioEngine.js?v=202607271016"></script>
-    <script src="/static/js/services/storage.js?v=202607271016"></script>
+    <script src="/static/js/services/storage.js?v=202608038200"></script>
     <script src="/static/js/services/soundfontStorage.js?v=202607271016"></script>
-    <script src="/static/js/services/soundfontPlayer.js?v=202607271245"></script>
-    <script src="/static/js/services/aiGateway.js?v=202607271016"></script>
+    <script src="/static/js/services/soundfontPlayer.js?v=202608060630"></script>
+    <script src="/static/js/services/aiGateway.js?v=202608037200"></script>
     <script src="/static/js/services/dawCommandDispatcher.js?v=202607271016"></script>
     <script src="/static/js/services/pianoRollTabService.js?v=202607272044"></script>
     <script src="/static/js/services/ghostNoteExtractor.js?v=202607271727"></script>
     <script src="/static/js/services/midiExtractor.js?v=202607281052"></script>
     <script src="/static/js/services/promptTemplateManager.js?v=202607281039"></script>
     <script src="/static/js/services/undoRedoEngine.js?v=202607290941"></script>
-    <script src="/static/js/app.precompiled.js?v=202607302132" defer></script>
+    <script src="/static/js/app.precompiled.js?v=202608061030" defer></script>
     <link rel="stylesheet" href="/static/css/styles.css?v=202607271016">
     <style>
         :root {
@@ -380,6 +381,32 @@
             border-radius: 2px;
             box-shadow: 0 4px 8px rgba(0,0,0,0.9), inset 0 1px 1px rgba(255,255,255,0.9);
         }
+
+        /* Media Explorer: horizontal volume slider + selected file row */
+        input[type=range].me-fader-slider {
+            -webkit-appearance: none;
+            appearance: none;
+            background: #111;
+            height: 6px;
+            border-radius: 3px;
+            border: 1px solid #555;
+            cursor: pointer;
+        }
+        input[type=range].me-fader-slider::-webkit-slider-thumb {
+            -webkit-appearance: none;
+            height: 16px;
+            width: 12px;
+            background: linear-gradient(180deg, #e2e8f0 0%, #64748b 50%, #1e293b 100%);
+            border: 1px solid #000;
+            border-radius: 2px;
+            box-shadow: 0 2px 4px rgba(0,0,0,0.5);
+            cursor: pointer;
+        }
+        .file-row-selected {
+            background-color: #3399ff !important;
+            color: #ffffff !important;
+        }
+        .file-row-selected .file-icon { color: #ffffff !important; }
     </style>
 </head>
 

app/test_sf3_load.py

@@ -0,0 +1,20 @@
+import os
+import sys
+
+sys.path.insert(0, "/app")
+
+try:
+    import fluidsynth
+    print("fluidsynth import successful.")
+    
+    fl = fluidsynth.Synth()
+    # Try to load a pre-existing system SF3
+    sf3_path = "/opt/daw_engine/soundfonts/Equinox_Grand_Pianos.sf3"
+    print(f"Checking if {sf3_path} exists: {os.path.exists(sf3_path)}")
+    if os.path.exists(sf3_path):
+        h = fl.sfload(sf3_path)
+        print(f"Loaded {sf3_path}, handle: {h}")
+    else:
+        print("Equinox_Grand_Pianos.sf3 not found.")
+except Exception as e:
+    print(f"Failed: {e}")

app/test_sf_convert.py

@@ -0,0 +1,66 @@
+import os
+import sys
+import logging
+
+# Ensure app is in path
+sys.path.insert(0, "/app")
+
+logging.basicConfig(level=logging.INFO)
+logger = logging.getLogger("test_sf_convert")
+
+from app.core.soundfont_converter import SoundFontConverter
+
+def test():
+    sf2_dir = "/app/app/storage/soundfonts"
+    sf2_files = [os.path.join(sf2_dir, f) for f in os.listdir(sf2_dir) if f.endswith(".sf2") and "_decomp" not in f]
+    if not sf2_files:
+        logger.error("No SF2 files found in /app/app/storage/soundfonts")
+        return
+
+    sf2_path = sf2_files[0]
+    logger.info(f"Testing with SF2 file: {sf2_path}")
+
+    converter = SoundFontConverter()
+    
+    # Check ffmpeg encoder support
+    has_ogg = converter._check_ffmpeg_ogg()
+    logger.info(f"ffmpeg with libvorbis available: {has_ogg}")
+
+    # Convert SF2 -> SF3
+    sf3_path = sf2_path.replace(".sf2", ".sf3")
+    if os.path.exists(sf3_path):
+        os.remove(sf3_path)
+
+    logger.info("Converting SF2 -> SF3...")
+    result_path = converter.convert_sf2_to_sf3(sf2_path)
+    logger.info(f"Result path from convert_sf2_to_sf3: {result_path}")
+    
+    if result_path.endswith(".sf3"):
+        logger.info(f"SF3 file exists: {os.path.exists(sf3_path)}")
+        if os.path.exists(sf3_path):
+            logger.info(f"SF3 size: {os.path.getsize(sf3_path)} bytes")
+            # Verify if it plays audio
+            plays = converter._sf3_plays_audio(sf3_path)
+            logger.info(f"SF3 plays audio (pyfluidsynth verify): {plays}")
+            
+            # Now test decompression back to SF2
+            decomp_sf2 = sf3_path.replace(".sf3", "_decomp.sf2")
+            if os.path.exists(decomp_sf2):
+                os.remove(decomp_sf2)
+            
+            logger.info("Decompressing SF3 -> SF2...")
+            try:
+                decomp_result = converter.sf3_to_sf2(sf3_path, decomp_sf2)
+                logger.info(f"Decompress result path: {decomp_result}")
+                if os.path.exists(decomp_sf2):
+                    logger.info(f"Decompressed SF2 size: {os.path.getsize(decomp_sf2)} bytes")
+                    # Check if it plays
+                    decomp_plays = converter._sf3_plays_audio(decomp_sf2)
+                    logger.info(f"Decompressed SF2 plays audio: {decomp_plays}")
+            except Exception as e:
+                logger.error(f"Decompression failed: {e}", exc_info=True)
+    else:
+        logger.warning("Conversion did not produce an SF3 path.")
+
+if __name__ == "__main__":
+    test()

build.mjs

@@ -0,0 +1,14 @@
+// Rebuild app.precompiled.js from app.jsx using @babel/standalone (avoids the
+// Babel 8 ESM-only CLI conflict). Mirrors package.json's build script:
+//   babel app/static/js/app.jsx --config-file ./babel.config.json -o app/static/js/app.precompiled.js
+import * as Babel from '@babel/standalone';
+import { readFileSync, writeFileSync } from 'fs';
+
+const src = readFileSync('app/static/js/app.jsx', 'utf8');
+const out = Babel.transform(src, {
+  presets: ['react'],
+  filename: 'app.jsx',
+  sourceType: 'script',
+}).code;
+writeFileSync('app/static/js/app.precompiled.js', out);
+console.log('BUILD OK', out.length, 'bytes');

md/51_MEDIA_EXPLORER.md

@@ -0,0 +1,349 @@
+# DETAILED SPECIFICATION FOR DAW MEDIA EXPLORER PANEL INTERFACE & HTML5 SOURCE CODE
+
+This document details the design structure, features, and executable HTML5 source code for a general-purpose Media Explorer Panel interface styled after the REAPER DAW.
+
+---
+
+## I. DETAILED INTERFACE REGIONS
+
+The interface is divided vertically into 3 primary functional regions, arranged from top to bottom:
+
+### 1. Top Navigation Toolbar
+
+* **Left Navigation Button Group:** **←** (Back), **→** (Forward), **↑** (Up to Parent Directory), **↻** (Refresh).
+* **Directory Address Bar:** Displays the current folder path with a drop-down menu for quick-access path selection.
+* **Filter / Search Box:** Input field supporting quick file filtering and keyword searching.
+* **View Mode Button:** Toggle button for switching file display layouts (*Details* / *List* view).
+
+### 2. Middle Split Panel (Directory Tree + File List)
+
+* **Left Directory Tree View:**
+* Hierarchical tree structure displaying project directories, system shortcuts, drives, and audio sample library folders.
+* Supports expand/collapse toggle buttons and highlighted background states indicating the actively selected folder.
+
+
+* **Right File List Table:**
+* Displays audio and MIDI files with standard category icons.
+* Highlights the currently selected file with a prominent blue row background.
+
+
+
+### 3. Bottom Preview & Transport Panel
+
+* **Transport Control Bar & Playback Parameters:**
+* **Transport Buttons:** **■** (Stop), **▶** (Play), **❚❚** (Pause), **↻** (Loop/Repeat), **⚡ Auto-Play** (Automatically previews files upon selection).
+* **Parameter Controls:** Pitch adjustment (Pitch matching), Rate (Playback speed factor), Volume Slider (Gain adjustment in dB).
+* **Media Type Badge:** Label displaying file format classification (*MIDI* / *Audio*).
+
+
+* **Visualizer Canvas Display & Metadata:**
+* **Visualizer Canvas (Left):** Dark display area rendering an overview Piano Roll note grid (for MIDI files) or waveform display (for Audio files), integrated with a timeline/bar ruler and white Playhead cursor.
+* **Metadata Text Box (Right):** Information pane displaying detailed file parameters (MIDI event count, duration, sample rate / resolution).
+
+
+* **Footer Status Bar:**
+* Displays current playback timestamp vs. total file length.
+* Name of the currently selected/playing file.
+* Tempo metadata (BPM) and playback rate scale factor.
+
+
+
+---
+
+## II. EXECUTABLE HTML5 & TAILWIND CSS SOURCE CODE
+
+Below is the complete HTML5 source code integrating Web Audio API synthesis, a Canvas visualizer, and real-time interactive file selection and audio preview playback:
+
+```html
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>DAW Media Explorer Panel Component</title>
+  <script src="https://cdn.tailwindcss.com"></script>
+  <link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.4.0/css/all.min.css">
+  <link href="https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;700&display=swap" rel="stylesheet">
+  <style>
+    body { font-family: 'Inter', sans-serif; user-select: none; }
+    .font-mono { font-family: 'JetBrains Mono', monospace; }
+
+    /* REAPER Classic Panel Style */
+    .reaper-panel {
+      background: #c0c0c0;
+      border: 2px solid #ffffff;
+      border-right-color: #808080;
+      border-bottom-color: #808080;
+    }
+    .reaper-inset {
+      background: #ffffff;
+      border: 1px solid #808080;
+      box-shadow: inset 1px 1px 2px rgba(0,0,0,0.3);
+    }
+    .reaper-dark-inset {
+      background: #181818;
+      border: 1px solid #3a3a3a;
+      box-shadow: inset 1px 1px 3px rgba(0,0,0,0.8);
+    }
+    .file-row-selected {
+      background-color: #3399ff !important;
+      color: #ffffff !important;
+    }
+    .file-row-selected .file-icon { color: #ffffff !important; }
+
+    /* Scrollbar */
+    ::-webkit-scrollbar { width: 12px; height: 12px; }
+    ::-webkit-scrollbar-track { background: #e0e0e0; border-left: 1px solid #a0a0a0; }
+    ::-webkit-scrollbar-thumb { background: #b0b0b0; border: 1px solid #ffffff; border-right-color: #707070; border-bottom-color: #707070; }
+    ::-webkit-scrollbar-thumb:hover { background: #909090; }
+
+    /* Volume Slider */
+    input[type=range].fader-slider {
+      appearance: none; -webkit-appearance: none;
+      background: #111; height: 6px; border-radius: 3px; border: 1px solid #555;
+    }
+    input[type=range].fader-slider::-webkit-slider-thumb {
+      -webkit-appearance: none; height: 16px; width: 12px;
+      background: linear-gradient(180deg, #e2e8f0 0%, #64748b 50%, #1e293b 100%);
+      border: 1px solid #000; border-radius: 2px; box-shadow: 0 2px 4px rgba(0,0,0,0.5); cursor: pointer;
+    }
+  </style>
+</head>
+<body class="bg-slate-950 text-slate-900 h-screen flex items-center justify-center p-2 overflow-hidden">
+
+  <!-- MEDIA EXPLORER PANEL CONTAINER -->
+  <div class="w-full max-w-4xl h-[420px] flex flex-col reaper-panel text-slate-900 overflow-hidden shadow-2xl relative">
+    
+    <!-- 1. TOP NAVIGATION TOOLBAR -->
+    <div class="h-8 bg-[#d4d0c8] border-b border-[#808080] px-2 flex items-center justify-between text-xs shrink-0">
+      <div class="flex items-center gap-1 flex-1 mr-2">
+        <button class="w-5 h-5 bg-[#e0e0e0] hover:bg-[#ffffff] border border-[#707070] rounded-sm flex items-center justify-center text-[10px]" title="Back">
+          <i class="fa-solid fa-arrow-left"></i>
+        </button>
+        <button class="w-5 h-5 bg-[#e0e0e0] hover:bg-[#ffffff] border border-[#707070] rounded-sm flex items-center justify-center text-[10px]" title="Forward">
+          <i class="fa-solid fa-arrow-right"></i>
+        </button>
+        <button class="w-5 h-5 bg-[#e0e0e0] hover:bg-[#ffffff] border border-[#707070] rounded-sm flex items-center justify-center text-[10px]" title="Up Directory">
+          <i class="fa-solid fa-arrow-up"></i>
+        </button>
+        <button class="w-5 h-5 bg-[#e0e0e0] hover:bg-[#ffffff] border border-[#707070] rounded-sm flex items-center justify-center text-[10px]" title="Refresh">
+          <i class="fa-solid fa-rotate-right"></i>
+        </button>
+
+        <div class="flex-1 flex items-center reaper-inset h-5 px-1 bg-white">
+          <i class="fa-solid fa-folder-open text-[#d9a752] text-[11px] mr-1.5"></i>
+          <input type="text" id="addressBarInput" value="Root:\Media Library" class="w-full text-xs outline-none bg-transparent font-sans text-slate-800" readonly>
+          <i class="fa-solid fa-caret-down text-slate-600 text-[10px] ml-1"></i>
+        </div>
+      </div>
+
+      <div class="flex items-center gap-2">
+        <div class="flex items-center reaper-inset h-5 px-1 bg-white w-40">
+          <input type="text" placeholder="Filter/Search..." class="w-full text-xs outline-none bg-transparent font-sans text-slate-800">
+          <i class="fa-solid fa-caret-down text-slate-600 text-[10px] ml-1"></i>
+        </div>
+        <button class="px-2 py-0.5 bg-[#e0e0e0] hover:bg-[#ffffff] border border-[#707070] rounded-sm text-[11px] flex items-center gap-1 font-semibold">
+          <span>Details</span> <i class="fa-solid fa-caret-down text-[9px]"></i>
+        </button>
+      </div>
+    </div>
+
+    <!-- 2. MIDDLE SPLIT VIEW (DIRECTORY TREE + FILE LIST) -->
+    <div class="flex-1 flex overflow-hidden">
+      
+      <!-- DIRECTORY TREE (LEFT) -->
+      <div class="w-60 reaper-inset m-1 mr-0 overflow-y-auto p-1 text-xs select-none bg-white">
+        <div class="space-y-0.5 font-sans">
+          <div class="flex items-center gap-1 px-1 py-0.5 hover:bg-slate-200 text-slate-700"><span class="w-3"></span> &lt;Track Templates&gt;</div>
+          <div class="flex items-center gap-1 px-1 py-0.5 hover:bg-slate-200 text-slate-700"><span class="w-3"></span> &lt;Project Directory&gt;</div>
+          <div class="flex items-center gap-1 px-1 py-0.5 hover:bg-slate-200 text-slate-700"><i class="fa-solid fa-plus text-[9px] text-slate-500"></i> My Computer</div>
+
+          <!-- Selected Folder -->
+          <div id="folderMidi" class="flex items-center gap-1 px-1 py-0.5 hover:bg-blue-100 cursor-pointer font-semibold text-slate-900 bg-slate-300 rounded-sm">
+            <i class="fa-solid fa-minus text-[9px] text-slate-600"></i>
+            <i class="fa-solid fa-folder-open text-[#d9a752]"></i> Media Library
+          </div>
+
+          <div class="pl-3 space-y-0.5">
+            <div class="flex items-center gap-1 px-1 py-0.5 hover:bg-slate-200 cursor-pointer text-slate-800">
+              <i class="fa-solid fa-plus text-[9px] text-slate-500"></i> <i class="fa-solid fa-folder text-[#d9a752]"></i> Sound Effects
+            </div>
+            <div id="folderDigitalJuice" class="flex items-center gap-1 px-1 py-0.5 hover:bg-blue-100 cursor-pointer text-slate-800 pl-4">
+              <i class="fa-solid fa-folder text-[#d9a752]"></i> MIDI Collections
+            </div>
+          </div>
+
+          <div class="flex items-center gap-1 px-1 py-0.5 hover:bg-slate-200 text-slate-700"><i class="fa-solid fa-plus text-[9px] text-slate-500"></i> Desktop</div>
+          <div class="flex items-center gap-1 px-1 py-0.5 hover:bg-slate-200 text-slate-700"><i class="fa-solid fa-plus text-[9px] text-slate-500"></i> My Documents</div>
+        </div>
+      </div>
+
+      <!-- FILE LIST TABLE (RIGHT) -->
+      <div class="flex-1 reaper-inset m-1 overflow-y-auto relative bg-white">
+        <table class="w-full text-xs text-left border-collapse">
+          <thead class="sticky top-0 bg-[#e0e0e0] border-b border-[#a0a0a0] text-slate-800 font-semibold select-none shadow-sm z-10">
+            <tr><th class="py-1 px-2 border-r border-[#b0b0b0]">File</th></tr>
+          </thead>
+          <tbody id="fileListTbody" class="font-sans text-slate-800">
+            <!-- Dynamic File Rows -->
+          </tbody>
+        </table>
+      </div>
+
+    </div>
+
+    <!-- 3. BOTTOM PREVIEW CONTROL BAR & VISUALIZER CANVAS -->
+    <div class="h-32 bg-[#d4d0c8] border-t border-[#808080] p-1.5 flex flex-col justify-between text-xs shrink-0 select-none">
+      
+      <!-- CONTROLS ROW -->
+      <div class="flex items-center justify-between gap-2">
+        <div class="flex items-center gap-1">
+          <button id="btnStop" class="w-6 h-6 bg-[#e0e0e0] hover:bg-[#ffffff] border border-[#707070] rounded-sm flex items-center justify-center text-slate-800"><i class="fa-solid fa-square text-[10px]"></i></button>
+          <button id="btnPlay" class="w-6 h-6 bg-[#e0e0e0] hover:bg-[#ffffff] border border-[#707070] rounded-sm flex items-center justify-center text-emerald-700 font-bold"><i class="fa-solid fa-play text-xs"></i></button>
+          <button id="btnPause" class="w-6 h-6 bg-[#e0e0e0] hover:bg-[#ffffff] border border-[#707070] rounded-sm flex items-center justify-center text-amber-700"><i class="fa-solid fa-pause text-xs"></i></button>
+          <button id="btnLoop" class="w-6 h-6 bg-[#e0e0e0] hover:bg-[#ffffff] border border-[#707070] rounded-sm flex items-center justify-center text-slate-700"><i class="fa-solid fa-rotate-right text-xs"></i></button>
+          <button id="btnAutoPlay" class="h-6 px-2 bg-gradient-to-r from-cyan-600 to-emerald-600 text-white border border-slate-700 rounded-sm font-bold text-[10px] flex items-center gap-1 shadow-sm">
+            <i class="fa-solid fa-bolt text-[9px]"></i> <span>Auto-Play</span>
+          </button>
+        </div>
+
+        <div class="flex items-center gap-3 font-mono text-[11px]">
+          <div class="flex items-center gap-1">
+            <span>Pitch:</span>
+            <div class="reaper-inset px-1 bg-white h-5 flex items-center w-14">
+              <input type="number" value="0.00" step="0.5" class="w-full text-xs text-right outline-none bg-transparent">
+            </div>
+          </div>
+          <div class="flex items-center gap-1">
+            <span>Rate:</span>
+            <div class="reaper-inset px-1 bg-white h-5 flex items-center w-12">
+              <input type="number" value="1.0" step="0.1" class="w-full text-xs text-right outline-none bg-transparent">
+            </div>
+          </div>
+        </div>
+
+        <div class="flex items-center gap-2">
+          <span class="font-sans text-slate-700">Volume:</span>
+          <input id="volSlider" type="range" min="-60" max="12" step="0.5" value="0" class="fader-slider w-28">
+          <div class="reaper-inset px-1 bg-white h-5 flex items-center justify-center w-14 font-mono text-[11px]">
+            <span id="volDbText">0.00 dB</span>
+          </div>
+        </div>
+
+        <div id="badgeType" class="px-2 py-0.5 bg-purple-950 text-purple-300 border border-purple-800 font-mono font-bold text-[10px] rounded-sm">
+          MIDI
+        </div>
+      </div>
+
+      <!-- CANVAS & METADATA ROW -->
+      <div class="flex items-stretch gap-2 my-1 h-16">
+        <div class="flex-1 reaper-dark-inset relative overflow-hidden">
+          <canvas id="previewCanvas" class="w-full h-full block cursor-pointer"></canvas>
+        </div>
+
+        <div class="w-56 reaper-dark-inset p-1.5 font-mono text-[10px] text-slate-300 leading-tight overflow-y-auto">
+          <div id="metadataContent">
+            76 MIDI events<br>
+            Length: 16 quarter notes<br>
+            Length: 0:08.000 (est)<br>
+            Ticks per quarter note: 480
+          </div>
+        </div>
+      </div>
+
+      <!-- BOTTOM STATUS BAR -->
+      <div class="h-5 bg-[#c0c0c0] border-t border-[#ffffff] flex items-center justify-between text-[11px] font-mono px-1">
+        <div class="flex items-center gap-3">
+          <div id="timeRange" class="reaper-inset px-1.5 bg-white text-slate-900 font-bold">0.0000 / 16.0000</div>
+          <div class="reaper-inset px-1.5 bg-white text-slate-900">0.0000</div>
+          <div class="reaper-inset px-1.5 bg-white text-slate-900">16.0000</div>
+        </div>
+
+        <div id="statusFileName" class="text-slate-800 font-bold truncate max-w-xs">File_Selected.mid</div>
+        <div id="statusBpm" class="text-slate-700">130 bpm x0.923</div>
+      </div>
+
+    </div>
+
+  </div>
+
+  <!-- SCRIPT LOGIC -->
+  <script>
+    const sampleDb = {
+      midi: [
+        { name: "MIDI_Loop_01.mid", events: 95, lengthQn: 16, time: "0:08.000", tpqn: 480, bpm: 130 },
+        { name: "MIDI_Loop_02_Bass.mid", events: 48, lengthQn: 16, time: "0:08.000", tpqn: 480, bpm: 130 },
+        { name: "MIDI_Loop_03_Lead.mid", events: 110, lengthQn: 16, time: "0:08.000", tpqn: 480, bpm: 130 },
+        { name: "MIDI_Loop_04.mid", events: 76, lengthQn: 16, time: "0:08.000", tpqn: 480, bpm: 130 },
+        { name: "MIDI_Loop_05_Bass.mid", events: 52, lengthQn: 16, time: "0:08.000", tpqn: 480, bpm: 130 },
+        { name: "MIDI_Loop_06.mid", events: 88, lengthQn: 16, time: "0:08.000", tpqn: 480, bpm: 130 }
+      ]
+    };
+
+    let selectedFile = sampleDb.midi[3];
+    const fileListTbody = document.getElementById('fileListTbody');
+    const previewCanvas = document.getElementById('previewCanvas');
+    const canvasCtx = previewCanvas.getContext('2d');
+
+    function renderFiles() {
+      fileListTbody.innerHTML = '';
+      sampleDb.midi.forEach((f) => {
+        const tr = document.createElement('tr');
+        tr.className = `cursor-pointer hover:bg-blue-100 ${f.name === selectedFile.name ? 'file-row-selected' : ''}`;
+        tr.innerHTML = `<td class="py-1 px-2 flex items-center gap-2"><i class="fa-solid fa-music text-purple-600 file-icon"></i><span>${f.name}</span></td>`;
+        tr.onclick = () => {
+          selectedFile = f;
+          renderFiles();
+          updatePreview();
+        };
+        fileListTbody.appendChild(tr);
+      });
+    }
+
+    function updatePreview() {
+      document.getElementById('statusFileName').innerText = selectedFile.name;
+      document.getElementById('metadataContent').innerHTML = `${selectedFile.events} MIDI events<br>Length: ${selectedFile.lengthQn} quarter notes<br>Length: ${selectedFile.time} (est)<br>Ticks per quarter note: ${selectedFile.tpqn}`;
+      renderCanvas();
+    }
+
+    function renderCanvas() {
+      previewCanvas.width = previewCanvas.clientWidth;
+      previewCanvas.height = previewCanvas.clientHeight;
+      const w = previewCanvas.width, h = previewCanvas.height;
+      canvasCtx.clearRect(0, 0, w, h);
+
+      // Grid
+      canvasCtx.strokeStyle = '#222';
+      for (let y = 0; y < h - 14; y += 8) {
+        canvasCtx.beginPath(); canvasCtx.moveTo(0, y); canvasCtx.lineTo(w, y); canvasCtx.stroke();
+      }
+      canvasCtx.strokeStyle = '#333';
+      for (let b = 0; b <= 16; b += 4) {
+        const x = (b / 16) * w;
+        canvasCtx.beginPath(); canvasCtx.moveTo(x, 0); canvasCtx.lineTo(x, h - 14); canvasCtx.stroke();
+      }
+
+      // Notes
+      canvasCtx.fillStyle = '#9ca3af';
+      for (let i = 0; i < selectedFile.events; i++) {
+        const noteX = ((i * 17 + 76) % 95) / 100 * w;
+        const noteY = ((i * 13 + 76) % (h - 24)) + 4;
+        canvasCtx.fillRect(noteX, noteY, Math.max(8, (i % 5 + 1) * 12), 3);
+      }
+
+      // Bar Ruler
+      canvasCtx.fillStyle = '#111';
+      canvasCtx.fillRect(0, h - 14, w, 14);
+      canvasCtx.fillStyle = '#888';
+      canvasCtx.font = '9px JetBrains Mono';
+      for (let b = 0; b <= 12; b += 4) {
+        canvasCtx.fillText(b.toString(), (b / 16) * w + 2, h - 3);
+      }
+    }
+
+    window.onload = () => { renderFiles(); updatePreview(); };
+  </script>
+</body>
+</html>
+
+```

tests/conftest.py

@@ -0,0 +1,14 @@
+"""Pytest bootstrap: isolate the test suite from the development database.
+
+Must be imported before any app module (pytest imports conftest.py first), so
+app.models.user picks up the test DB path instead of the dev DB. Without this,
+tests that seed/rotate the admin password (test_auth_and_quota) permanently
+mutate the developer's sonicforge.db.
+"""
+import os
+import tempfile
+
+os.environ.setdefault(
+    "SONICFORGE_DB_PATH",
+    os.path.join(tempfile.gettempdir(), "sonicforge_test.db"),
+)

tests/test_plugin_api.py

@@ -13,7 +13,17 @@ client = TestClient(app)
 def get_admin_token():
     resp = client.post("/api/v1/auth/login", json={"username": "admin", "password": "admin123"})
     if resp.status_code == 200:
-        return resp.json()["access_token"]
+        token = resp.json()["access_token"]
+        # Admin is seeded with must_change_password=1; the app blocks music
+        # processing until the first password change. Complete that flow here
+        # (keeping the same password) so feature tests run unblocked.
+        user = resp.json()["user"]
+        if user.get("must_change_password"):
+            r = client.post("/api/v1/auth/change-password", headers={"Authorization": f"Bearer {token}"},
+                            json={"old_password": "admin123", "new_password": "admin123"})
+            if r.status_code == 200:
+                token = r.json()["access_token"]
+        return token
     return None
 
 

tests/test_project_upgrade.py

@@ -0,0 +1,68 @@
+"""Regression tests for legacy project upgrade (items must stay on their tracks
+with correct bar positions)."""
+import json
+
+from app.api.v1.projects import upgrade_project_json_if_needed
+
+
+def _legacy_project():
+    return {
+        "id": "legacy_1",
+        "name": "Legacy",
+        "bpm": 120.0,  # 1 bar = 2.0s
+        "tracks": [
+            {
+                "id": "1",
+                "name": "Track 1",
+                "volumeDb": 0.0,
+                "pan": 0.0,
+                "muted": False,
+                "solo": False,
+                "serverFileId": "abc.wav",
+                "clips": [{"id": "c1", "name": "clip1", "startTime": 2.0}],
+                "midiItems": [],
+            },
+            {
+                "id": "2",
+                "name": "Track 2",
+                "volumeDb": 0.0,
+                "pan": 0.0,
+                "muted": False,
+                "solo": False,
+                "serverFileId": None,
+                "clips": [],
+                "midiItems": [
+                    {"id": "m1", "name": "midi1", "startTime": 4.0, "duration": 4.0,
+                     "notes": [{"id": "n1", "pitch": 60, "start_beat": 0.0, "duration_beats": 1.0, "velocity": 0.8}]}
+                ],
+            },
+        ],
+    }
+
+
+def test_upgrade_keeps_items_on_their_tracks():
+    upgraded = upgrade_project_json_if_needed(_legacy_project())
+    tracks = upgraded["main_session"]["tracks"]
+    assert len(tracks) == 2
+    t1_items = tracks[0]["items"]
+    t2_items = tracks[1]["items"]
+    # Items must NOT be merged into the first track
+    assert [i["type"] for i in t1_items] == ["AUDIO_ITEM"]
+    assert [i["type"] for i in t2_items] == ["MIDI_ITEM"]
+    assert t1_items[0]["id"] == "c1"
+    assert t2_items[0]["id"] == "m1"
+
+
+def test_upgrade_uses_bpm_based_seconds_per_bar():
+    upgraded = upgrade_project_json_if_needed(_legacy_project())
+    tracks = upgraded["main_session"]["tracks"]
+    # 120bpm -> 1 bar = 2.0s; clip at 2.0s -> start_bar 1.0
+    assert tracks[0]["items"][0]["start_bar"] == 1.0
+    # midi at 4.0s -> start_bar 2.0; duration 4.0s -> 2.0 bars
+    assert tracks[1]["items"][0]["start_bar"] == 2.0
+    assert tracks[1]["items"][0]["duration_bars"] == 2.0
+
+
+def test_upgrade_skips_new_format():
+    data = {"main_session": {"tracks": []}}
+    assert upgrade_project_json_if_needed(data) is data

tests/test_security_hardening.py

@@ -0,0 +1,234 @@
+"""Regression tests for security hardening.
+
+Covers the vulnerabilities found during the 2026-08 audit:
+- SSRF / open proxy on /api/v1/ai/proxy
+- path traversal on render output and audio file ids
+- unauthenticated filesystem access via /api/v1/media/*
+- hardcoded SECRET_KEY
+- quota bypass on project update
+- audio resampling correctness in the render engine
+"""
+import os
+import json
+
+import numpy as np
+import pytest
+import soundfile as sf
+from fastapi.testclient import TestClient
+
+from app.main import app
+from app.config import settings
+from app.core import auth as core_auth
+
+client = TestClient(app)
+
+
+def get_admin_token():
+    # test_auth_and_quota.py may have rotated the admin password; try both.
+    for pwd in ("admin123", "admin_new_password_2026"):
+        resp = client.post("/api/v1/auth/login", json={"username": "admin", "password": pwd})
+        if resp.status_code != 200:
+            continue
+        token = resp.json()["access_token"]
+        user = resp.json()["user"]
+        if user.get("must_change_password"):
+            r = client.post("/api/v1/auth/change-password", headers={"Authorization": f"Bearer {token}"},
+                            json={"old_password": pwd, "new_password": pwd})
+            if r.status_code == 200:
+                token = r.json()["access_token"]
+        return token
+    return None
+
+
+def auth_headers():
+    return {"Authorization": f"Bearer {get_admin_token()}"}
+
+
+# ── 1. SSRF / open proxy ──
+
+class TestAIProxySSRF:
+    def test_proxy_requires_auth(self):
+        resp = client.post("/api/v1/ai/proxy", json={"url": "https://api.openai.com/v1", "body": {}})
+        assert resp.status_code == 401
+
+    def test_proxy_blocks_cloud_metadata(self):
+        resp = client.post("/api/v1/ai/proxy", headers=auth_headers(),
+                           json={"url": "http://169.254.169.254/latest/meta-data/", "body": {}})
+        assert resp.status_code == 403
+
+    def test_proxy_blocks_private_ip_not_configured(self):
+        resp = client.post("/api/v1/ai/proxy", headers=auth_headers(),
+                           json={"url": "http://10.0.0.5/", "body": {}})
+        assert resp.status_code == 403
+
+    def test_proxy_rejects_non_http_scheme(self):
+        resp = client.post("/api/v1/ai/proxy", headers=auth_headers(),
+                           json={"url": "file:///etc/passwd", "body": {}})
+        assert resp.status_code == 400
+
+    def test_proxy_allows_configured_localhost_provider(self):
+        # localhost:11434 is in the default AI provider list; it must pass the
+        # SSRF check (and then fail to connect in this environment -> 502).
+        resp = client.post("/api/v1/ai/proxy", headers=auth_headers(),
+                           json={"url": "http://localhost:11434/v1/chat/completions", "body": {}})
+        assert resp.status_code == 502
+
+
+# ── 2. Path traversal ──
+
+class TestPathTraversal:
+    def test_render_output_filename_sanitized(self):
+        token = get_admin_token()
+        if not token:
+            pytest.skip("Cannot get admin token")
+        project = {
+            "metadata": {"bpm": 120, "time_signature_numerator": 4},
+            "main_session": {"length_bars": 1, "tracks": []},
+            "section_store": {},
+        }
+        resp = client.post("/api/v1/plugins/render", headers=auth_headers(),
+                           json={"project_json": project, "output_filename": "/tmp/evil_traversal.wav"})
+        # Absolute paths must be reduced to a basename inside PROCESSED_DIR.
+        assert resp.status_code == 200, resp.text
+        out_path = resp.json()["path"]
+        assert os.path.dirname(out_path) == settings.PROCESSED_DIR
+        assert os.path.basename(out_path) == "evil_traversal.wav"
+        assert os.path.isfile(out_path)
+
+    def test_audio_download_rejects_traversal(self):
+        resp = client.get("/api/v1/audio/download/..%2F..%2Fapp%2Fconfig.py")
+        assert resp.status_code == 404
+
+    def test_ai_scan_rejects_traversal_file_id(self):
+        resp = client.post("/api/v1/audio/ai-scan",
+                           json={"track_id": "1", "file_id": "../../app/config.py"})
+        # Traversal must NOT read the file: falls through to the demo branch.
+        assert resp.status_code == 200
+        assert resp.json()["success"] is True
+
+
+# ── 3. Filesystem exposure via media endpoints ──
+
+class TestMediaAuth:
+    # Use a fresh client (no cookies from earlier logins) to prove 401.
+    @pytest.fixture(autouse=True)
+    def _fresh_client(self):
+        self.fresh = TestClient(app)
+        yield
+        self.fresh.close()
+
+    def test_media_computer_requires_auth(self):
+        resp = self.fresh.get("/api/v1/media/computer")
+        assert resp.status_code == 401
+
+    def test_media_browse_requires_auth(self):
+        resp = self.fresh.get("/api/v1/media/browse", params={"path": "/etc"})
+        assert resp.status_code == 401
+
+    def test_media_file_requires_auth(self):
+        resp = self.fresh.get("/api/v1/media/file", params={"path": "/etc/passwd"})
+        assert resp.status_code == 401
+
+
+# ── 4. Secret key ──
+
+class TestSecretKey:
+    def test_secret_key_not_hardcoded_default(self):
+        assert core_auth.SECRET_KEY != "sonicforge_secret_key_super_secure_2026"
+        assert len(core_auth.SECRET_KEY) >= 32
+
+
+# ── 5. Quota enforcement on update ──
+
+class TestQuotaUpdate:
+    def test_update_cloud_project_enforces_quota(self):
+        token = get_admin_token()
+        if not token:
+            pytest.skip("Cannot get admin token")
+        # Register a fresh user with a small quota (unique name per run so the
+        # test is re-runnable against a persistent DB).
+        import uuid as _uuid
+        uname = f"quota_user_{_uuid.uuid4().hex[:8]}"
+        resp = client.post("/api/v1/auth/register", json={
+            "username": uname, "email": f"{uname}@studio.com", "password": "quota_pass_123"})
+        assert resp.status_code == 200, resp.text
+        user_token = resp.json()["access_token"]
+        user_headers = {"Authorization": f"Bearer {user_token}"}
+
+        # Shrink quota to 1 MB via admin API.
+        uid = resp.json()["user"]["id"]
+        r = client.put(f"/api/v1/admin/quotas/{uid}", headers=auth_headers(),
+                       json={"storage_limit_mb": 1, "max_tracks": 16})
+        assert r.status_code == 200, r.text
+
+        # Save a small project.
+        small = json.dumps({
+            "project_id": "p1",
+            "metadata": {"title": "small", "bpm": 120, "time_signature_numerator": 4,
+                         "time_signature_denominator": 4, "sample_rate": 44100},
+            "main_session": {"id": "main", "name": "MAIN SESSION", "is_root": True,
+                             "length_bars": 16.0, "auto_compute_length": True, "tracks": []},
+            "section_store": {}})
+        r = client.post("/api/v1/projects/cloud", headers=user_headers,
+                        json={"name": "small", "data_json": small})
+        assert r.status_code == 200, r.text
+        pid = r.json()["project_id"]
+
+        # Updating with a payload over the quota must be rejected (was a bypass).
+        items = [{
+            "type": "AUDIO_ITEM", "id": f"it_{i}", "name": "n",
+            "start_bar": 0.0, "duration_bars": 1.0, "clip_start_offset_bars": 0.0,
+            "source_data": {"audio_file_url": "", "gain": 1.0},
+        } for i in range(20000)]
+        huge = json.dumps({
+            "project_id": "p1",
+            "metadata": {"title": "huge", "bpm": 120, "time_signature_numerator": 4,
+                         "time_signature_denominator": 4, "sample_rate": 44100},
+            "main_session": {"id": "main", "name": "MAIN SESSION", "is_root": True,
+                             "length_bars": 16.0, "auto_compute_length": True,
+                             "tracks": [{"id": "t", "name": "x", "type": "AUDIO", "items": items}]},
+            "section_store": {}})
+        r = client.put(f"/api/v1/projects/cloud/{pid}", headers=user_headers,
+                       json={"name": "huge", "data_json": huge})
+        assert r.status_code == 400, r.text
+        assert "Quota" in r.json()["detail"]
+
+
+# ── 6. Render engine: resampling correctness ──
+
+class TestRenderResample:
+    def test_audio_item_resampled_to_engine_rate(self, tmp_path):
+        from app.core.render_engine import PythonRenderEngine
+        # 44.1kHz source, engine at 22.05kHz -> exactly 2x downsampling.
+        sr_src = 44100
+        t = np.arange(sr_src) / sr_src
+        tone = (0.5 * np.sin(2 * np.pi * 440 * t)).astype(np.float32)
+        src_path = os.path.join(settings.UPLOADS_DIR, "resample_test_tone.wav")
+        sf.write(src_path, tone, sr_src)
+
+        engine = PythonRenderEngine(sample_rate=22050)
+        session = {
+            "tracks": [{
+                "type": "AUDIO",
+                "volume_db": 0.0, "pan": 0.0, "mute": False,
+                "items": [{
+                    "type": "AUDIO_ITEM",
+                    "start_bar": 0.0, "duration_bars": 4.0,
+                    "clip_start_offset_bars": 0.0,
+                    "source_data": {"audio_file_url": "/static/audio/uploads/resample_test_tone.wav", "gain": 1.0},
+                }],
+            }]
+        }
+        buf = engine.render_session_container(session, {}, bpm=120.0, time_sig_num=4,
+                                              total_samples=engine.sample_rate * 2)
+        # A 1s 440Hz tone must actually render energy (previously the SR
+        # mismatch silently skipped the audio).
+        assert np.max(np.abs(buf)) > 0.01
+        # Duration should be ~1 second at the engine rate, not 2.
+        nonzero = np.where(np.abs(buf[0]) > 1e-4)[0]
+        assert len(nonzero) > 0
+        assert (nonzero[-1] - nonzero[0]) < int(engine.sample_rate * 1.3)
+        try:
+            os.remove(src_path)
+        except OSError:
+            pass

tools/cloud_projects_backup.json

@@ -0,0 +1,993 @@
+[
+  {
+    "id": "bca1bb5f-b656-48a8-b113-8fff900188ab",
+    "name": "Test",
+    "data_json": {
+      "project_id": "project_1784710097790",
+      "metadata": {
+        "title": "Test",
+        "bpm": 120.0,
+        "time_signature_numerator": 4,
+        "time_signature_denominator": 4,
+        "sample_rate": 44100
+      },
+      "main_session": {
+        "id": "main",
+        "name": "MAIN SESSION",
+        "is_root": true,
+        "length_bars": 16.0,
+        "auto_compute_length": true,
+        "tracks": [
+          {
+            "id": "1",
+            "name": "Track 01",
+            "type": "AUDIO",
+            "volume_db": 0,
+            "pan": 0,
+            "mute": false,
+            "solo": false,
+            "fx_chain": [],
+            "synth_engine": {
+              "plugin_id": "synth",
+              "preset_id": "default",
+              "parameters": {}
+            },
+            "items": []
+          },
+          {
+            "id": "2",
+            "name": "Track 02",
+            "type": "AUDIO",
+            "volume_db": 0,
+            "pan": 0,
+            "mute": false,
+            "solo": false,
+            "fx_chain": [],
+            "synth_engine": {
+              "plugin_id": "synth",
+              "preset_id": "default",
+              "parameters": {}
+            },
+            "items": []
+          }
+        ]
+      },
+      "section_store": {}
+    },
+    "updated_at": 1784710143.4476569
+  },
+  {
+    "id": "d627f532-b632-4ef0-a21f-80dcc2ac8396",
+    "name": "Test",
+    "data_json": {
+      "project_id": "project_1784719724178",
+      "metadata": {
+        "title": "Test",
+        "bpm": 120.0,
+        "time_signature_numerator": 4,
+        "time_signature_denominator": 4,
+        "sample_rate": 44100
+      },
+      "main_session": {
+        "id": "main",
+        "name": "MAIN SESSION",
+        "is_root": true,
+        "length_bars": 16.0,
+        "auto_compute_length": true,
+        "tracks": [
+          {
+            "id": "1",
+            "name": "Track 01",
+            "type": "AUDIO",
+            "volume_db": 0,
+            "pan": 0,
+            "mute": false,
+            "solo": false,
+            "fx_chain": [],
+            "synth_engine": {
+              "plugin_id": "synth",
+              "preset_id": "default",
+              "parameters": {}
+            },
+            "items": []
+          },
+          {
+            "id": "2",
+            "name": "Track 02",
+            "type": "AUDIO",
+            "volume_db": 0,
+            "pan": 0,
+            "mute": false,
+            "solo": false,
+            "fx_chain": [],
+            "synth_engine": {
+              "plugin_id": "synth",
+              "preset_id": "default",
+              "parameters": {}
+            },
+            "items": []
+          }
+        ]
+      },
+      "section_store": {}
+    },
+    "updated_at": 1784719770.23144
+  },
+  {
+    "id": "a17fe50b-c51d-408d-b45c-c09645777e68",
+    "name": "Test",
+    "data_json": {
+      "project_id": "project_1784719775936",
+      "metadata": {
+        "title": "Test",
+        "bpm": 120.0,
+        "time_signature_numerator": 4,
+        "time_signature_denominator": 4,
+        "sample_rate": 44100
+      },
+      "main_session": {
+        "id": "main",
+        "name": "MAIN SESSION",
+        "is_root": true,
+        "length_bars": 16.0,
+        "auto_compute_length": true,
+        "tracks": [
+          {
+            "id": "1",
+            "name": "Track 01",
+            "type": "AUDIO",
+            "volume_db": 0,
+            "pan": 0,
+            "mute": false,
+            "solo": false,
+            "fx_chain": [],
+            "synth_engine": {
+              "plugin_id": "synth",
+              "preset_id": "default",
+              "parameters": {}
+            },
+            "items": []
+          },
+          {
+            "id": "2",
+            "name": "Track 02",
+            "type": "AUDIO",
+            "volume_db": 0,
+            "pan": 0,
+            "mute": false,
+            "solo": false,
+            "fx_chain": [],
+            "synth_engine": {
+              "plugin_id": "synth",
+              "preset_id": "default",
+              "parameters": {}
+            },
+            "items": []
+          }
+        ]
+      },
+      "section_store": {}
+    },
+    "updated_at": 1784719821.9856758
+  },
+  {
+    "id": "38a0f344-05dc-47e3-a769-07426c57f5fe",
+    "name": "Test",
+    "data_json": {
+      "project_id": "project_1784720540893",
+      "metadata": {
+        "title": "Test",
+        "bpm": 120.0,
+        "time_signature_numerator": 4,
+        "time_signature_denominator": 4,
+        "sample_rate": 44100
+      },
+      "main_session": {
+        "id": "main",
+        "name": "MAIN SESSION",
+        "is_root": true,
+        "length_bars": 16.0,
+        "auto_compute_length": true,
+        "tracks": [
+          {
+            "id": "1",
+            "name": "Cartoon Capers Loop.mp3",
+            "type": "AUDIO",
+            "volume_db": 0,
+            "pan": 0,
+            "mute": false,
+            "solo": false,
+            "fx_chain": [],
+            "synth_engine": {
+              "plugin_id": "synth",
+              "preset_id": "default",
+              "parameters": {}
+            },
+            "items": []
+          },
+          {
+            "id": "2",
+            "name": "Track 02",
+            "type": "AUDIO",
+            "volume_db": 0,
+            "pan": 0,
+            "mute": false,
+            "solo": false,
+            "fx_chain": [],
+            "synth_engine": {
+              "plugin_id": "synth",
+              "preset_id": "default",
+              "parameters": {}
+            },
+            "items": []
+          }
+        ]
+      },
+      "section_store": {}
+    },
+    "updated_at": 1784720586.9746954
+  },
+  {
+    "id": "8037d8f5-1410-4639-8167-5b89dcb1c3e9",
+    "name": "Rose",
+    "data_json": {
+      "project_id": "project_1784720555735",
+      "metadata": {
+        "title": "Rose",
+        "bpm": 120.0,
+        "time_signature_numerator": 4,
+        "time_signature_denominator": 4,
+        "sample_rate": 44100
+      },
+      "main_session": {
+        "id": "main",
+        "name": "MAIN SESSION",
+        "is_root": true,
+        "length_bars": 16.0,
+        "auto_compute_length": true,
+        "tracks": [
+          {
+            "id": "1",
+            "name": "Track 01",
+            "type": "AUDIO",
+            "volume_db": 0,
+            "pan": 0,
+            "mute": false,
+            "solo": false,
+            "fx_chain": [],
+            "synth_engine": {
+              "plugin_id": "synth",
+              "preset_id": "default",
+              "parameters": {}
+            },
+            "items": []
+          },
+          {
+            "id": "2",
+            "name": "Track 02",
+            "type": "AUDIO",
+            "volume_db": 0,
+            "pan": 0,
+            "mute": false,
+            "solo": false,
+            "fx_chain": [],
+            "synth_engine": {
+              "plugin_id": "synth",
+              "preset_id": "default",
+              "parameters": {}
+            },
+            "items": []
+          }
+        ]
+      },
+      "section_store": {}
+    },
+    "updated_at": 1784720601.8155787
+  },
+  {
+    "id": "525bdab5-e594-4a0c-a3e6-102a0abef816",
+    "name": "Rose (autosave 03/08)",
+    "data_json": {
+      "project_id": "8037d8f5-1410-4639-8167-5b89dcb1c3e9",
+      "metadata": {
+        "title": "Rose (autosave 03/08)",
+        "bpm": 128,
+        "time_signature_numerator": 4,
+        "time_signature_denominator": 4,
+        "sample_rate": 44100
+      },
+      "main_session": {
+        "id": "main",
+        "name": "MAIN SESSION",
+        "is_root": true,
+        "length_bars": 16,
+        "auto_compute_length": true,
+        "tracks": [
+          {
+            "id": "1",
+            "name": "Track 01",
+            "type": "MIDI",
+            "volume_db": 0,
+            "pan": 0,
+            "mute": false,
+            "solo": false,
+            "instrument_id": "sf_DSK_Asian_DreamZ",
+            "instrument_program": 5,
+            "instrument_name": "BAN-DI",
+            "items": [
+              {
+                "id": "midi_1785057918746",
+                "name": "MIDI Item",
+                "type": "MIDI_ITEM",
+                "start_bar": 0,
+                "duration_bars": 4,
+                "clip_start_offset_bars": 0,
+                "source_data": {
+                  "total_buffer_bars": 4,
+                  "notes": [
+                    {
+                      "id": "note_1785057946413j2a54",
+                      "pitch": 55,
+                      "start_beat": 1.5,
+                      "duration_beats": 0.125,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057946488uv1f6r6q_2",
+                      "pitch": 56,
+                      "start_beat": 1.5166666666666666,
+                      "duration_beats": 0.2333333333333334,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057946505gxl5rre2_3",
+                      "pitch": 57,
+                      "start_beat": 1.75,
+                      "duration_beats": 0.3833333333333333,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057946522v0dmipvj_4",
+                      "pitch": 60,
+                      "start_beat": 2.1333333333333333,
+                      "duration_beats": 0.2666666666666666,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_17850579465381vqpeamx_5",
+                      "pitch": 62,
+                      "start_beat": 2.4,
+                      "duration_beats": 0.21666666666666679,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057946555rmpgksfp_6",
+                      "pitch": 63,
+                      "start_beat": 2.6166666666666667,
+                      "duration_beats": 0.20000000000000018,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057946572cvrxri09_7",
+                      "pitch": 64,
+                      "start_beat": 2.816666666666667,
+                      "duration_beats": 0.25,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057946588nvmp7zld_8",
+                      "pitch": 66,
+                      "start_beat": 3.066666666666667,
+                      "duration_beats": 0.1499999999999999,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057946605jkbnh8mf_9",
+                      "pitch": 67,
+                      "start_beat": 3.216666666666667,
+                      "duration_beats": 0.2666666666666666,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057946638i28svktt_10",
+                      "pitch": 68,
+                      "start_beat": 3.4833333333333334,
+                      "duration_beats": 0.1499999999999999,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_17850579466559iy45ml8_11",
+                      "pitch": 69,
+                      "start_beat": 3.6333333333333333,
+                      "duration_beats": 0.1333333333333333,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057946672s712j5m6_12",
+                      "pitch": 70,
+                      "start_beat": 3.7666666666666666,
+                      "duration_beats": 0.1333333333333333,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057946688pq858zcx_13",
+                      "pitch": 71,
+                      "start_beat": 3.9,
+                      "duration_beats": 0.18333333333333313,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_17850579467054usc79tx_14",
+                      "pitch": 72,
+                      "start_beat": 4.083333333333333,
+                      "duration_beats": 0.15000000000000036,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057946722dspmlfaa_15",
+                      "pitch": 73,
+                      "start_beat": 4.233333333333333,
+                      "duration_beats": 0.2999999999999998,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057946755h5mvip3h_16",
+                      "pitch": 74,
+                      "start_beat": 4.533333333333333,
+                      "duration_beats": 0.15000000000000036,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057946772a5e5iona_17",
+                      "pitch": 75,
+                      "start_beat": 4.683333333333334,
+                      "duration_beats": 0.16666666666666607,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057946788cfqxk2c8_18",
+                      "pitch": 76,
+                      "start_beat": 4.85,
+                      "duration_beats": 0.2666666666666666,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_178505794682247xy477z_19",
+                      "pitch": 77,
+                      "start_beat": 5.116666666666666,
+                      "duration_beats": 0.25,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057946855nygukqis_20",
+                      "pitch": 78,
+                      "start_beat": 5.366666666666666,
+                      "duration_beats": 0.20000000000000018,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057946888oyfvmvq2_21",
+                      "pitch": 79,
+                      "start_beat": 5.566666666666666,
+                      "duration_beats": 0.35000000000000053,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057947455xrq7rfmm_22",
+                      "pitch": 78,
+                      "start_beat": 5.916666666666667,
+                      "duration_beats": 0.2833333333333332,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_17850579474722sn8bsed_23",
+                      "pitch": 77,
+                      "start_beat": 6.2,
+                      "duration_beats": 0.31666666666666643,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057947489mbv5z7q6_24",
+                      "pitch": 76,
+                      "start_beat": 6.516666666666667,
+                      "duration_beats": 0.2833333333333332,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057947505qmasllso_25",
+                      "pitch": 75,
+                      "start_beat": 6.8,
+                      "duration_beats": 0.41666666666666696,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057947539wkqyr6fw_26",
+                      "pitch": 74,
+                      "start_beat": 7.216666666666667,
+                      "duration_beats": 0.18333333333333357,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057947572a2ydjwzu_27",
+                      "pitch": 73,
+                      "start_beat": 7.4,
+                      "duration_beats": 0.1999999999999993,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057947589b18pcser_28",
+                      "pitch": 72,
+                      "start_beat": 7.6,
+                      "duration_beats": 0.16666666666666696,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057947605bsiv751r_29",
+                      "pitch": 71,
+                      "start_beat": 7.766666666666667,
+                      "duration_beats": 0.13333333333333375,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057947622ii453i6x_30",
+                      "pitch": 70,
+                      "start_beat": 7.9,
+                      "duration_beats": 0.18333333333333357,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057947639zdv6seea_31",
+                      "pitch": 69,
+                      "start_beat": 8.083333333333334,
+                      "duration_beats": 0.36666666666666536,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057947672devle9p7_32",
+                      "pitch": 68,
+                      "start_beat": 8.45,
+                      "duration_beats": 0.25,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057947689x8rgn7ih_33",
+                      "pitch": 67,
+                      "start_beat": 8.7,
+                      "duration_beats": 0.3333333333333339,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057947722u5b36hrl_34",
+                      "pitch": 66,
+                      "start_beat": 9.033333333333333,
+                      "duration_beats": 0.2833333333333332,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057947772f9qp4st0_35",
+                      "pitch": 65,
+                      "start_beat": 9.316666666666666,
+                      "duration_beats": 0.38333333333333286,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057947805cf5bjiv1_36",
+                      "pitch": 64,
+                      "start_beat": 9.7,
+                      "duration_beats": 0.6666666666666679,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057947855ojfcoccj_37",
+                      "pitch": 63,
+                      "start_beat": 10.366666666666667,
+                      "duration_beats": 0.36666666666666536,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_17850579478721jvhzolj_38",
+                      "pitch": 62,
+                      "start_beat": 10.733333333333333,
+                      "duration_beats": 0.3000000000000007,
+                      "velocity": 0.8,
+                      "pan": 0
+                    },
+                    {
+                      "id": "note_1785057947889nqk9ckue_39",
+                      "pitch": 61,
+                      "start_beat": 11.033333333333333,
+                      "duration_beats": 0.3333333333333339,
+                      "velocity": 0.8,
+                      "pan": 0
+                    }
+                  ]
+                }
+              }
+            ]
+          },
+          {
+            "id": "2",
+            "name": "Track 02",
+            "type": "AUDIO",
+            "volume_db": 0,
+            "pan": 0,
+            "mute": false,
+            "solo": false,
+            "instrument_id": null,
+            "instrument_program": null,
+            "instrument_name": null,
+            "items": []
+          }
+        ]
+      },
+      "sub_tabs": [
+        {
+          "id": "midi_1785057919362",
+          "label": "Piano Roll: MIDI Item",
+          "type": "PIANO_ROLL",
+          "track_id": "1",
+          "target_id": "midi_1785057918746",
+          "parent_tab_id": null,
+          "notes": [
+            {
+              "id": "note_1785057946413j2a54",
+              "pitch": 55,
+              "start_beat": 1.5,
+              "duration_beats": 0.125,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057946488uv1f6r6q_2",
+              "pitch": 56,
+              "start_beat": 1.5166666666666666,
+              "duration_beats": 0.2333333333333334,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057946505gxl5rre2_3",
+              "pitch": 57,
+              "start_beat": 1.75,
+              "duration_beats": 0.3833333333333333,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057946522v0dmipvj_4",
+              "pitch": 60,
+              "start_beat": 2.1333333333333333,
+              "duration_beats": 0.2666666666666666,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_17850579465381vqpeamx_5",
+              "pitch": 62,
+              "start_beat": 2.4,
+              "duration_beats": 0.21666666666666679,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057946555rmpgksfp_6",
+              "pitch": 63,
+              "start_beat": 2.6166666666666667,
+              "duration_beats": 0.20000000000000018,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057946572cvrxri09_7",
+              "pitch": 64,
+              "start_beat": 2.816666666666667,
+              "duration_beats": 0.25,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057946588nvmp7zld_8",
+              "pitch": 66,
+              "start_beat": 3.066666666666667,
+              "duration_beats": 0.1499999999999999,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057946605jkbnh8mf_9",
+              "pitch": 67,
+              "start_beat": 3.216666666666667,
+              "duration_beats": 0.2666666666666666,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057946638i28svktt_10",
+              "pitch": 68,
+              "start_beat": 3.4833333333333334,
+              "duration_beats": 0.1499999999999999,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_17850579466559iy45ml8_11",
+              "pitch": 69,
+              "start_beat": 3.6333333333333333,
+              "duration_beats": 0.1333333333333333,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057946672s712j5m6_12",
+              "pitch": 70,
+              "start_beat": 3.7666666666666666,
+              "duration_beats": 0.1333333333333333,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057946688pq858zcx_13",
+              "pitch": 71,
+              "start_beat": 3.9,
+              "duration_beats": 0.18333333333333313,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_17850579467054usc79tx_14",
+              "pitch": 72,
+              "start_beat": 4.083333333333333,
+              "duration_beats": 0.15000000000000036,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057946722dspmlfaa_15",
+              "pitch": 73,
+              "start_beat": 4.233333333333333,
+              "duration_beats": 0.2999999999999998,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057946755h5mvip3h_16",
+              "pitch": 74,
+              "start_beat": 4.533333333333333,
+              "duration_beats": 0.15000000000000036,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057946772a5e5iona_17",
+              "pitch": 75,
+              "start_beat": 4.683333333333334,
+              "duration_beats": 0.16666666666666607,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057946788cfqxk2c8_18",
+              "pitch": 76,
+              "start_beat": 4.85,
+              "duration_beats": 0.2666666666666666,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_178505794682247xy477z_19",
+              "pitch": 77,
+              "start_beat": 5.116666666666666,
+              "duration_beats": 0.25,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057946855nygukqis_20",
+              "pitch": 78,
+              "start_beat": 5.366666666666666,
+              "duration_beats": 0.20000000000000018,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057946888oyfvmvq2_21",
+              "pitch": 79,
+              "start_beat": 5.566666666666666,
+              "duration_beats": 0.35000000000000053,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057947455xrq7rfmm_22",
+              "pitch": 78,
+              "start_beat": 5.916666666666667,
+              "duration_beats": 0.2833333333333332,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_17850579474722sn8bsed_23",
+              "pitch": 77,
+              "start_beat": 6.2,
+              "duration_beats": 0.31666666666666643,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057947489mbv5z7q6_24",
+              "pitch": 76,
+              "start_beat": 6.516666666666667,
+              "duration_beats": 0.2833333333333332,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057947505qmasllso_25",
+              "pitch": 75,
+              "start_beat": 6.8,
+              "duration_beats": 0.41666666666666696,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057947539wkqyr6fw_26",
+              "pitch": 74,
+              "start_beat": 7.216666666666667,
+              "duration_beats": 0.18333333333333357,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057947572a2ydjwzu_27",
+              "pitch": 73,
+              "start_beat": 7.4,
+              "duration_beats": 0.1999999999999993,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057947589b18pcser_28",
+              "pitch": 72,
+              "start_beat": 7.6,
+              "duration_beats": 0.16666666666666696,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057947605bsiv751r_29",
+              "pitch": 71,
+              "start_beat": 7.766666666666667,
+              "duration_beats": 0.13333333333333375,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057947622ii453i6x_30",
+              "pitch": 70,
+              "start_beat": 7.9,
+              "duration_beats": 0.18333333333333357,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057947639zdv6seea_31",
+              "pitch": 69,
+              "start_beat": 8.083333333333334,
+              "duration_beats": 0.36666666666666536,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057947672devle9p7_32",
+              "pitch": 68,
+              "start_beat": 8.45,
+              "duration_beats": 0.25,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057947689x8rgn7ih_33",
+              "pitch": 67,
+              "start_beat": 8.7,
+              "duration_beats": 0.3333333333333339,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057947722u5b36hrl_34",
+              "pitch": 66,
+              "start_beat": 9.033333333333333,
+              "duration_beats": 0.2833333333333332,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057947772f9qp4st0_35",
+              "pitch": 65,
+              "start_beat": 9.316666666666666,
+              "duration_beats": 0.38333333333333286,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057947805cf5bjiv1_36",
+              "pitch": 64,
+              "start_beat": 9.7,
+              "duration_beats": 0.6666666666666679,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057947855ojfcoccj_37",
+              "pitch": 63,
+              "start_beat": 10.366666666666667,
+              "duration_beats": 0.36666666666666536,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_17850579478721jvhzolj_38",
+              "pitch": 62,
+              "start_beat": 10.733333333333333,
+              "duration_beats": 0.3000000000000007,
+              "velocity": 0.8,
+              "pan": 0
+            },
+            {
+              "id": "note_1785057947889nqk9ckue_39",
+              "pitch": 61,
+              "start_beat": 11.033333333333333,
+              "duration_beats": 0.3333333333333339,
+              "velocity": 0.8,
+              "pan": 0
+            }
+          ],
+          "duration": 7.5,
+          "instrument_program": 5,
+          "instrument_name": "BAN-DI",
+          "current_time": 0,
+          "color": null
+        }
+      ],
+      "section_store": {}
+    },
+    "updated_at": 1785058087.45
+  }
+]

tools/restore_cloud_projects.py

@@ -0,0 +1,62 @@
+"""Khôi phục các dự án cloud cũ (từ git history) vào bất kỳ sonicforge.db nào.
+
+Cách dùng trên máy deployment thật (host game):
+    python3 tools/restore_cloud_projects.py /path/to/sonicforge.db
+
+Script đọc backup projects (JSON) đã xuất từ git history và chèn vào DB chỉ định,
+gán tất cả cho user_id được yêu cầu (mặc định: admin đầu tiên tìm thấy).
+"""
+import json
+import os
+import sqlite3
+import sys
+
+PROJECTS_BACKUP = os.path.join(os.path.dirname(__file__), "cloud_projects_backup.json")
+
+
+def main(db_path: str, user_id: str = None):
+    if not os.path.exists(PROJECTS_BACKUP):
+        print(f"Không tìm thấy {PROJECTS_BACKUP}")
+        return 1
+    if not os.path.exists(db_path):
+        print(f"Không tìm thấy DB: {db_path}")
+        return 1
+
+    with open(PROJECTS_BACKUP) as f:
+        projects = json.load(f)
+
+    conn = sqlite3.connect(db_path)
+    conn.row_factory = sqlite3.Row
+
+    if user_id is None:
+        row = conn.execute("SELECT id FROM users WHERE role='admin' ORDER BY created_at LIMIT 1").fetchone()
+        if not row:
+            print("Không có user admin nào trong DB")
+            conn.close()
+            return 1
+        user_id = row["id"]
+        print(f"Gán tất cả cho admin: {user_id}")
+
+    restored = 0
+    for p in projects:
+        if conn.execute("SELECT id FROM projects WHERE id=?", (p["id"],)).fetchone():
+            print(f"  bỏ qua (đã tồn tại): {p['name']}")
+            continue
+        conn.execute(
+            "INSERT INTO projects (id, user_id, name, data_json, is_temp, size_bytes, updated_at) VALUES (?,?,?,?,0,?,?)",
+            (p["id"], user_id, p["name"], json.dumps(p["data_json"], ensure_ascii=False),
+             len(json.dumps(p["data_json"]).encode("utf-8")), p["updated_at"]))
+        restored += 1
+        print(f"  đã khôi phục: {p['name']}")
+
+    conn.commit()
+    conn.close()
+    print(f"\nHoàn tất: {restored} dự án đã khôi phục cho user {user_id}")
+    return 0
+
+
+if __name__ == "__main__":
+    if len(sys.argv) < 2:
+        print("Usage: python3 restore_cloud_projects.py <path/to/sonicforge.db> [user_id]")
+        sys.exit(1)
+    sys.exit(main(sys.argv[1], sys.argv[2] if len(sys.argv) > 2 else None))