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fix unstable playback in browser runtime

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This commit is contained in:
Dennis Ranke
2022-05-04 00:32:41 +02:00
parent 7e203d93e6
commit a2714f25e4
2 changed files with 27 additions and 14 deletions
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21
web/src/audiolet.js
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@@ -3,13 +3,17 @@ class APU extends AudioWorkletProcessor {
constructor() {
super();
this.sampleIndex = 0;
this.currentTime = 0;
this.isFirstMessage = true;
this.pendingUpdates = [];
this.port.onmessage = (ev) => {
if(this.memory) {
if(isNaN(ev.data)) {
U8(this.memory.buffer, 80, 32).set(U8(ev.data));
} else {
this.startTime = ev.data;
if(this.isFirstMessage)
{
this.currentTime += (ev.data.t - this.currentTime) / 8;
this.isFirstMessage = false;
}
this.pendingUpdates.push(ev.data);
} else {
this.load(ev.data[0], ev.data[1]);
}
@@ -55,9 +59,13 @@ class APU extends AudioWorkletProcessor {
}
process(inputs, outputs, parameters) {
if(this.snd && this.startTime) {
this.isFirstMessage = true;
if(this.snd) {
while(this.pendingUpdates.length > 0 && this.pendingUpdates[0].t <= this.currentTime) {
U8(this.memory.buffer, 80, 32).set(U8(this.pendingUpdates.shift().r));
}
let u32Mem = new Uint32Array(this.memory.buffer);
u32Mem[16] = Date.now() - this.startTime;
u32Mem[16] = this.currentTime;
let channels = outputs[0];
let index = this.sampleIndex;
let numSamples = channels[0].length;
@@ -66,6 +74,7 @@ class APU extends AudioWorkletProcessor {
channels[1][i] = this.snd(index++);
}
this.sampleIndex = index & 0xffffffff;
this.currentTime += numSamples / 44.1;
}
return true;