40 lines
1.3 KiB
JavaScript
40 lines
1.3 KiB
JavaScript
|
class AudioProcessor extends AudioWorkletProcessor {
|
||
|
|
constructor() {
|
||
|
|
super();
|
||
|
|
this.desiredBufferSize = 20*1024; // 期望的缓冲区大小
|
||
|
|
this.buffer = new Float32Array(this.desiredBufferSize);
|
||
|
|
this.bufferIndex = 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
process(inputs, outputs, parameters) {
|
||
|
|
const input = inputs[0];
|
||
|
|
const channel = input[0];
|
||
|
|
|
||
|
|
if (channel && channel.length > 0) {
|
||
|
|
// 将新数据添加到缓冲区
|
||
|
|
for (let i = 0; i < channel.length; i++) {
|
||
|
|
this.buffer[this.bufferIndex++] = channel[i];
|
||
|
|
|
||
|
|
// 当缓冲区满时，发送数据
|
||
|
|
if (this.bufferIndex >= this.desiredBufferSize) {
|
||
|
|
// 将浮点音频数据转换为16位整数
|
||
|
|
const pcmData = new Int16Array(this.desiredBufferSize);
|
||
|
|
for (let j = 0; j < this.desiredBufferSize; j++) {
|
||
|
|
pcmData[j] = Math.min(Math.max(this.buffer[j] * 32767, -32767), 32767);
|
||
|
|
}
|
||
|
|
|
||
|
|
// 发送数据到主线程
|
||
|
|
this.port.postMessage(pcmData.buffer, [pcmData.buffer]);
|
||
|
|
|
||
|
|
// 重置缓冲区
|
||
|
|
this.buffer = new Float32Array(this.desiredBufferSize);
|
||
|
|
this.bufferIndex = 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
registerProcessor('audio-processor', AudioProcessor);
|