feat: thêm soundfont và VSTi cho MIDI

2026-07-23 17:47:46 +07:00
parent 0b2382573f
commit 225f23516f
16 changed files with 1232 additions and 60 deletions
@@ -0,0 +1,75 @@
+// SonicForge Studio SoundFont Player Service
+(function () {
+    'use strict';
+
+    // Web Audio API fallback synth
+    let audioCtx = null;
+    let gainNode = null;
+    const activeOscillators = {};
+
+    function getCtx() {
+        if (!audioCtx) {
+            audioCtx = new (window.AudioContext || window.webkitAudioContext)();
+            gainNode = audioCtx.createGain();
+            gainNode.gain.value = 0.3;
+            gainNode.connect(audioCtx.destination);
+        }
+        return audioCtx;
+    }
+
+    const SonicSF = {
+        loadedFonts: {},
+
+        // Load SoundFont from URL → ArrayBuffer → store in memory
+        loadSoundFont: async function (url) {
+            if (this.loadedFonts[url]) return this.loadedFonts[url];
+            const resp = await fetch(url);
+            if (!resp.ok) throw new Error('Failed to load SoundFont: ' + url);
+            const buffer = await resp.arrayBuffer();
+            this.loadedFonts[url] = buffer;
+            return buffer;
+        },
+
+        // Play a MIDI note using Web Audio fallback
+        playNote: function (note, velocity, durationMs) {
+            const ctx = getCtx();
+            const freq = 440 * Math.pow(2, (note - 69) / 12);
+            const osc = ctx.createOscillator();
+            const noteGain = ctx.createGain();
+            osc.type = 'triangle';
+            osc.frequency.value = freq;
+            noteGain.gain.setValueAtTime(velocity / 127 * 0.3, ctx.currentTime);
+            noteGain.gain.exponentialRampToValueAtTime(0.001, ctx.currentTime + durationMs / 1000);
+            osc.connect(noteGain);
+            noteGain.connect(ctx.destination);
+            osc.start(ctx.currentTime);
+            osc.stop(ctx.currentTime + durationMs / 1000 + 0.05);
+            activeOscillators[note] = osc;
+            return osc;
+        },
+
+        stopAll: function () {
+            Object.values(activeOscillators).forEach(osc => {
+                try { osc.stop(); } catch (e) { }
+            });
+            Object.keys(activeOscillators).forEach(k => delete activeOscillators[k]);
+        },
+
+        // Save user SoundFont to IndexedDB via window.SonicStorage
+        saveToIndexedDB: async function (name, arrayBuffer) {
+            if (window.SonicStorage && window.SonicStorage.saveToIndexedDB) {
+                await window.SonicStorage.saveToIndexedDB('soundfont_' + name, arrayBuffer);
+            }
+        },
+
+        // Load user SoundFont from IndexedDB
+        loadFromIndexedDB: async function (name) {
+            if (window.SonicStorage && window.SonicStorage.loadFromIndexedDB) {
+                return await window.SonicStorage.loadFromIndexedDB('soundfont_' + name);
+            }
+            return null;
+        }
+    };
+
+    window.SonicSF = SonicSF;
+})();