Javascript AudioWorklet-将输出设置为Float32Array以流式传输实时音频?
我有从服务器到客户端的音频数据流。它以Node.js缓冲区(Uint8Array)开始,然后通过port.postMessage()发送到AudiWorkletProcessor,在那里它被转换为Float32Array并存储在this.data中。我花了数小时试图将输出设置为Float32Array中包含的音频数据。记录Float32Array预处理可以显示准确的数据,但在处理过程中记录数据表明,在发布新消息时,数据不会改变。这可能是我低级音频编程知识的一个缺口 当数据到达客户端时,调用以下函数:Javascript AudioWorklet-将输出设置为Float32Array以流式传输实时音频?,javascript,node.js,audio-streaming,web-audio-api,audio-processing,Javascript,Node.js,Audio Streaming,Web Audio Api,Audio Processing,我有从服务器到客户端的音频数据流。它以Node.js缓冲区(Uint8Array)开始,然后通过port.postMessage()发送到AudiWorkletProcessor,在那里它被转换为Float32Array并存储在this.data中。我花了数小时试图将输出设置为Float32Array中包含的音频数据。记录Float32Array预处理可以显示准确的数据,但在处理过程中记录数据表明,在发布新消息时,数据不会改变。这可能是我低级音频编程知识的一个缺口 当数据到达客户端时,调用以下函
process = (data) => {
this.node.port.postMessage(data)
}
另外,(你可以让我知道)也许我应该使用参数描述符而不是postMessage?无论如何,这是我的AudioWorkletProcessor:
class BypassProcessor extends AudioWorkletProcessor {
constructor() {
super();
this.isPlaying = true;
this.port.onmessage = this.onmessage.bind(this)
}
static get parameterDescriptors() {
return [{ // Maybe we should use parameters. This is not utilized at present.
name: 'stream',
defaultValue: 0.707
}];
}
convertBlock = (incomingData) => { // incoming data is a UInt8Array
let i, l = incomingData.length;
let outputData = new Float32Array(incomingData.length);
for (i = 0; i < l; i++) {
outputData[i] = (incomingData[i] - 128) / 128.0;
}
return outputData;
}
onmessage(event) {
const { data } = event;
let ui8 = new Uint8Array(data);
this.data = this.convertBlock(ui8)
}
process(inputs, outputs) {
const input = inputs[0];
const output = outputs[0];
if (this.data) {
for (let channel = 0; channel < output.length; ++channel) {
const inputChannel = input[channel]
const outputChannel = output[channel]
for (let i = 0; i < inputChannel.length; ++i) {
outputChannel[i] = this.data[i]
}
}
}
return true;
}
}
registerProcessor('bypass-processor', BypassProcessor);
类处理器扩展了AudioWorkletProcessor{
构造函数(){
超级();
this.isplay=true;
this.port.onmessage=this.onmessage.bind(this)
}
静态获取参数描述符(){
return[{//也许我们应该使用参数。目前还没有使用。
名称:'流',
默认值:0.707
}];
}
convertBlock=(incomingData)=>{//传入数据是UINT8数组
设i,l=incomingData.length;
让outputData=newfloat32array(incomingData.length);
对于(i=0;i如何简单地将AudioWorkletProcessor的输出设置为通过的数据?AudioWorkletProcessor仅处理每128个字节,因此您需要管理自己的缓冲区,以确保这是适用于
AudioWorklet
的情况,可能需要添加FIFO。
我使用WebAssembly中实现的RingBuffer(FIFO)解决了类似的问题,在我的例子中,我接收到一个160字节的缓冲区
查看我的AudioWorkletProcessor实现
import Module from './buffer-kernel.wasmodule.js';
import { HeapAudioBuffer, RingBuffer, ALAW_TO_LINEAR } from './audio-helper.js';
class SpeakerWorkletProcessor extends AudioWorkletProcessor {
constructor(options) {
super();
this.payload = null;
this.bufferSize = options.processorOptions.bufferSize; // Getting buffer size from options
this.channelCount = options.processorOptions.channelCount;
this.inputRingBuffer = new RingBuffer(this.bufferSize, this.channelCount);
this.outputRingBuffer = new RingBuffer(this.bufferSize, this.channelCount);
this.heapInputBuffer = new HeapAudioBuffer(Module, this.bufferSize, this.channelCount);
this.heapOutputBuffer = new HeapAudioBuffer(Module, this.bufferSize, this.channelCount);
this.kernel = new Module.VariableBufferKernel(this.bufferSize);
this.port.onmessage = this.onmessage.bind(this);
}
alawToLinear(incomingData) {
const outputData = new Float32Array(incomingData.length);
for (let i = 0; i < incomingData.length; i++) {
outputData[i] = (ALAW_TO_LINEAR[incomingData[i]] * 1.0) / 32768;
}
return outputData;
}
onmessage(event) {
const { data } = event;
if (data) {
this.payload = this.alawToLinear(new Uint8Array(data)); //Receiving data from my Socket listener and in my case converting PCM alaw to linear
} else {
this.payload = null;
}
}
process(inputs, outputs) {
const output = outputs[0];
if (this.payload) {
this.inputRingBuffer.push([this.payload]); // Pushing data from my Socket
if (this.inputRingBuffer.framesAvailable >= this.bufferSize) { // if the input data size hits the buffer size, so I can "outputted"
this.inputRingBuffer.pull(this.heapInputBuffer.getChannelData());
this.kernel.process(
this.heapInputBuffer.getHeapAddress(),
this.heapOutputBuffer.getHeapAddress(),
this.channelCount,
);
this.outputRingBuffer.push(this.heapOutputBuffer.getChannelData());
}
this.outputRingBuffer.pull(output); // Retriving data from FIFO and putting our output
}
return true;
}
}
registerProcessor(`speaker-worklet-processor`, SpeakerWorkletProcessor);
看看我是如何将数据从套接字接收和发送到audioWorklet的
protected onMessage(e: any): void { //My Socket message listener
const { data:serverData } = e;
const socketId = e.socketId;
if (this.audioWalking && this.ws && !this.ws.isPaused() && this.ws.info.socketId === socketId) {
const buffer = arrayBufferToBuffer(serverData);
const rtp = RTPParser.parseRtpPacket(buffer);
const sharedPayload = new Uint8Array(new SharedArrayBuffer(rtp.payload.length)); //sharing javascript buffer memory between main thread and worklet thread
sharedPayload.set(rtp.payload, 0);
this.speakerWorklet.port.postMessage(sharedPayload); //Sending data to worklet
}
}
为了帮助人们,我将此解决方案的重要部分放在Github上
protected onMessage(e: any): void { //My Socket message listener
const { data:serverData } = e;
const socketId = e.socketId;
if (this.audioWalking && this.ws && !this.ws.isPaused() && this.ws.info.socketId === socketId) {
const buffer = arrayBufferToBuffer(serverData);
const rtp = RTPParser.parseRtpPacket(buffer);
const sharedPayload = new Uint8Array(new SharedArrayBuffer(rtp.payload.length)); //sharing javascript buffer memory between main thread and worklet thread
sharedPayload.set(rtp.payload, 0);
this.speakerWorklet.port.postMessage(sharedPayload); //Sending data to worklet
}
}