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- worklet gom 1024 mẫu (4 block) vào 1 frame interleaved, main thread tách 4 WS frame 512 floats - bridge take=min(avail,4) xử lí 1 call process cho burst → overhead VST3 amortize 4 lần - engine _pump_output pace theo deadline thay vì sleep cố định (outRead 131→187.5/s) - FX_RT_ROUNDTRIP_SAMPLES 512→1792 (RTT batching ~7 block)
87 lines
3.4 KiB
JavaScript
87 lines
3.4 KiB
JavaScript
// sf-fx-realtime.js — AudioWorkletProcessor nối WebAudio → SHM FX engine.
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// process() gom 128-sample quantum thành block 256 stereo float32 (khớp
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// FXRT_BLOCK trong FxRealtimeIPC.h) → postMessage cho main thread gửi WS;
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// nhận block đã xử lý từ main thread → queue → phát ra output. Queue rỗng →
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// zero fill (WS chưa kịp round-trip).
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//
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// BURST (fix lag/giật/crackle): gom 4 block (1024 mẫu) vào 1 frame rồi post.
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// Bridge VST3 (fx_vst_bridge) chạy chậm hơn realtime khi take=1 (256 mẫu:
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// ~5.5ms/call > budget 5.33ms → 179/s < 187.5/s → engine drop input →
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// crackle). Gửi burst 4 block → bridge take=4 → 1 call process 1024 mẫu
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// (amortize overhead: 14-19ms/4 block ≈ 3.5-4.75ms/block) → đủ 187.5/s.
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// Latency thêm ~4 block (~21ms) — worklet outQueue 32 block hấp thụ.
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//
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// Latency ~2 block; backlog > 32 block (~190ms) → drop block cũ nhất. Cap cao
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// hấp thụ jitter main thread (rAF renderFrame nặng khi mở MASTERING PANEL) mà
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// không drop. ponytail: thay drop bằng adaptive stretch khi cần chất lượng cao.
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class SfFxRealtimeProcessor extends AudioWorkletProcessor {
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constructor() {
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super();
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this.BLOCK = 256; // FXRT_BLOCK
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this.BURST = 4; // số block gom 1 frame (bridge batch)
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this.bufLen = this.BLOCK * this.BURST;
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this.inL = new Float32Array(this.bufLen);
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this.inR = new Float32Array(this.bufLen);
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this.inCount = 0;
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this.outQueue = []; // [{l: Float32Array, r: Float32Array}]
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this.outPos = 0;
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this.port.onmessage = (e) => {
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const d = e.data;
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if (d && d.type === 'set_param') { this.port.postMessage(d); return; }
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if (!d || d.type !== 'out' || !d.l || !d.r) return;
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this.outQueue.push({ l: d.l, r: d.r });
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while (this.outQueue.length > 32) this.outQueue.shift();
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};
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}
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process(inputs, outputs) {
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const input = inputs[0];
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const output = outputs[0];
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const n = output[0] ? output[0].length : 128;
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const outL = output[0];
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const outR = output[1];
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// Góp input thành burst 4 block (1024 mẫu) → gửi main thread
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// (transferable buffer). Main thread tách 4 WS frame → bridge batch 4.
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if (input && input[0]) {
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const inL = input[0];
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const inR = input[1] || input[0];
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for (let i = 0; i < n; i++) {
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if (this.inCount < this.bufLen) {
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this.inL[this.inCount] = inL[i];
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this.inR[this.inCount] = inR[i];
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}
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this.inCount++;
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if (this.inCount >= this.bufLen) {
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const inter = new Float32Array(this.bufLen * 2);
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for (let j = 0; j < this.bufLen; j++) {
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inter[j * 2] = this.inL[j];
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inter[j * 2 + 1] = this.inR[j];
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}
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this.port.postMessage({ type: 'in', data: inter.buffer }, [inter.buffer]);
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this.inCount = 0;
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}
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}
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}
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// Phát output từ queue; rỗng → zero.
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for (let i = 0; i < n; i++) {
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if (this.outQueue.length === 0) {
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outL[i] = 0;
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if (outR) outR[i] = 0;
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continue;
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}
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const blk = this.outQueue[0];
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outL[i] = blk.l[this.outPos];
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if (outR) outR[i] = blk.r[this.outPos];
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this.outPos++;
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if (this.outPos >= this.BLOCK) {
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this.outQueue.shift();
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this.outPos = 0;
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}
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}
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return true;
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}
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}
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registerProcessor('sf-fx-realtime', SfFxRealtimeProcessor);
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