fix: time selection click and shiftclick

2026-07-20 19:44:23 +07:00
parent 271f0583f4
commit 85a8dc6d17
13 changed files with 1788 additions and 293 deletions
@@ -0,0 +1,77 @@
+# SonicForge Studio VST / VSTi Engine Service (22_CLIENT_DESK.md §3)
+import numpy as np
+
+def midi_note_to_freq(note_number: int) -> float:
+    """Quy đổi số nốt MIDI (0 - 127) sang tần số Hertz (Hz)."""
+    return 440.0 * (2.0 ** ((note_number - 69) / 12.0))
+
+def render_midi_events_to_audio(midi_events: list, sr: int = 44100, bpm: float = 120.0, instrument: str = 'synth') -> np.ndarray:
+    """
+    Tổng hợp mảng âm thanh NumPy Stereo từ sự kiện MIDI Piano Roll (22_CLIENT_DESK.md §3.1 & §3.2).
+    
+    Args:
+        midi_events: Danh sách nốt MIDI [{"note": 60, "start_beat": 0, "duration_beats": 1, "velocity": 100}, ...]
+        sr: Tần số lấy mẫu (Sample Rate)
+        bpm: Nhịp BPM của dự án
+        instrument: Loại nhạc cụ tổng hợp
+        
+    Returns:
+        np.ndarray: Mảng 2D Stereo Float32 [2, num_samples]
+    """
+    beat_duration_sec = 60.0 / max(30.0, bpm)
+    max_duration_sec = 2.0
+    
+    for event in midi_events:
+        start_beat = event.get('start_beat', 0.0)
+        dur_beats = event.get('duration_beats', 1.0)
+        end_sec = (start_beat + dur_beats) * beat_duration_sec
+        if end_sec > max_duration_sec:
+            max_duration_sec = end_sec
+            
+    total_samples = int((max_duration_sec + 0.5) * sr)
+    out_l = np.zeros(total_samples, dtype=np.float32)
+    out_r = np.zeros(total_samples, dtype=np.float32)
+    
+    for event in midi_events:
+        note = event.get('note', 60)
+        velocity = event.get('velocity', 100) / 127.0
+        start_beat = event.get('start_beat', 0.0)
+        dur_beats = event.get('duration_beats', 1.0)
+        
+        start_sample = int(start_beat * beat_duration_sec * sr)
+        dur_samples = int(dur_beats * beat_duration_sec * sr)
+        end_sample = min(total_samples, start_sample + dur_samples)
+        actual_len = end_sample - start_sample
+        
+        if actual_len <= 0 or start_sample >= total_samples:
+            continue
+            
+        freq = midi_note_to_freq(note)
+        t = np.arange(actual_len) / float(sr)
+        
+        # Synth tone + fundamental harmonics
+        tone = 0.6 * np.sin(2 * np.pi * freq * t) + 0.3 * np.sin(2 * np.pi * freq * 2 * t) + 0.1 * np.sin(2 * np.pi * freq * 3 * t)
+        
+        # ADSR Envelope
+        attack = min(int(0.01 * sr), actual_len // 4)
+        release = min(int(0.05 * sr), actual_len // 4)
+        sustain_len = actual_len - attack - release
+        
+        env = np.ones(actual_len, dtype=np.float32)
+        if attack > 0:
+            env[:attack] = np.linspace(0.0, 1.0, attack)
+        if release > 0:
+            env[-release:] = np.linspace(1.0, 0.0, release)
+            
+        signal = tone * env * velocity
+        
+        out_l[start_sample:end_sample] += signal
+        out_r[start_sample:end_sample] += signal
+        
+    # Clamping normalization to prevent clipping
+    max_peak = max(np.max(np.abs(out_l)), np.max(np.abs(out_r)))
+    if max_peak > 1.0:
+        out_l /= max_peak
+        out_r /= max_peak
+        
+    return np.vstack([out_l, out_r])