671 lines
24 KiB
JavaScript
671 lines
24 KiB
JavaScript
const SAMPLE_RATE = 16000;
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const CHANNELS = 1;
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const FRAME_SIZE = 960; // 对应于60ms帧大小 (16000Hz * 0.06s = 960 samples)
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const OPUS_APPLICATION = 2049; // OPUS_APPLICATION_AUDIO
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const BUFFER_SIZE = 4096;
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let audioContext = new (window.AudioContext || window.webkitAudioContext)({ sampleRate: SAMPLE_RATE });
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let mediaStream, mediaSource, audioProcessor;
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let recordedPcmData = []; // 存储原始PCM数据
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let recordedOpusData = []; // 存储Opus编码后的数据
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let opusEncoder, opusDecoder;
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let isRecording = false;
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const startButton = document.getElementById("start");
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const stopButton = document.getElementById("stop");
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const playButton = document.getElementById("play");
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const statusLabel = document.getElementById("status");
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startButton.addEventListener("click", startRecording);
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stopButton.addEventListener("click", stopRecording);
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playButton.addEventListener("click", playRecording);
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// 初始化Opus编码器与解码器
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async function initOpus() {
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if (typeof window.ModuleInstance === 'undefined') {
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if (typeof Module !== 'undefined') {
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// 尝试使用全局Module
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window.ModuleInstance = Module;
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console.log('使用全局Module作为ModuleInstance');
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} else {
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console.error("Opus库未加载，ModuleInstance和Module对象都不存在");
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return false;
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}
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}
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try {
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const mod = window.ModuleInstance;
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// 创建编码器
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opusEncoder = {
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channels: CHANNELS,
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sampleRate: SAMPLE_RATE,
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frameSize: FRAME_SIZE,
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maxPacketSize: 4000,
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module: mod,
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// 初始化编码器
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init: function() {
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// 获取编码器大小
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const encoderSize = mod._opus_encoder_get_size(this.channels);
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console.log(`Opus编码器大小: ${encoderSize}字节`);
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// 分配内存
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this.encoderPtr = mod._malloc(encoderSize);
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if (!this.encoderPtr) {
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throw new Error("无法分配编码器内存");
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}
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// 初始化编码器
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const err = mod._opus_encoder_init(
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this.encoderPtr,
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this.sampleRate,
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this.channels,
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OPUS_APPLICATION
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);
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if (err < 0) {
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throw new Error(`Opus编码器初始化失败: ${err}`);
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}
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return true;
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},
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// 编码方法
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encode: function(pcmData) {
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const mod = this.module;
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// 为PCM数据分配内存
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const pcmPtr = mod._malloc(pcmData.length * 2); // Int16 = 2字节
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// 将数据复制到WASM内存
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for (let i = 0; i < pcmData.length; i++) {
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mod.HEAP16[(pcmPtr >> 1) + i] = pcmData[i];
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}
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// 为Opus编码数据分配内存
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const maxEncodedSize = this.maxPacketSize;
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const encodedPtr = mod._malloc(maxEncodedSize);
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// 编码
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const encodedBytes = mod._opus_encode(
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this.encoderPtr,
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pcmPtr,
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this.frameSize,
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encodedPtr,
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maxEncodedSize
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);
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if (encodedBytes < 0) {
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mod._free(pcmPtr);
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mod._free(encodedPtr);
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throw new Error(`Opus编码失败: ${encodedBytes}`);
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}
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// 复制编码后的数据
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const encodedData = new Uint8Array(encodedBytes);
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for (let i = 0; i < encodedBytes; i++) {
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encodedData[i] = mod.HEAPU8[encodedPtr + i];
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}
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// 释放内存
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mod._free(pcmPtr);
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mod._free(encodedPtr);
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return encodedData;
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},
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// 销毁方法
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destroy: function() {
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if (this.encoderPtr) {
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this.module._free(this.encoderPtr);
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this.encoderPtr = null;
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}
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}
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};
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// 创建解码器
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opusDecoder = {
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channels: CHANNELS,
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rate: SAMPLE_RATE,
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frameSize: FRAME_SIZE,
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module: mod,
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// 初始化解码器
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init: function() {
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// 获取解码器大小
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const decoderSize = mod._opus_decoder_get_size(this.channels);
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console.log(`Opus解码器大小: ${decoderSize}字节`);
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// 分配内存
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this.decoderPtr = mod._malloc(decoderSize);
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if (!this.decoderPtr) {
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throw new Error("无法分配解码器内存");
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}
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// 初始化解码器
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const err = mod._opus_decoder_init(
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this.decoderPtr,
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this.rate,
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this.channels
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);
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if (err < 0) {
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throw new Error(`Opus解码器初始化失败: ${err}`);
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}
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return true;
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},
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// 解码方法
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decode: function(opusData) {
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const mod = this.module;
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// 为Opus数据分配内存
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const opusPtr = mod._malloc(opusData.length);
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mod.HEAPU8.set(opusData, opusPtr);
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// 为PCM输出分配内存
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const pcmPtr = mod._malloc(this.frameSize * 2); // Int16 = 2字节
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// 解码
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const decodedSamples = mod._opus_decode(
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this.decoderPtr,
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opusPtr,
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opusData.length,
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pcmPtr,
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this.frameSize,
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0 // 不使用FEC
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);
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if (decodedSamples < 0) {
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mod._free(opusPtr);
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mod._free(pcmPtr);
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throw new Error(`Opus解码失败: ${decodedSamples}`);
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}
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// 复制解码后的数据
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const decodedData = new Int16Array(decodedSamples);
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for (let i = 0; i < decodedSamples; i++) {
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decodedData[i] = mod.HEAP16[(pcmPtr >> 1) + i];
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}
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// 释放内存
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mod._free(opusPtr);
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mod._free(pcmPtr);
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return decodedData;
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},
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// 销毁方法
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destroy: function() {
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if (this.decoderPtr) {
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this.module._free(this.decoderPtr);
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this.decoderPtr = null;
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}
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}
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};
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// 初始化编码器和解码器
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if (opusEncoder.init() && opusDecoder.init()) {
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console.log("Opus 编码器和解码器初始化成功。");
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return true;
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} else {
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console.error("Opus 初始化失败");
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return false;
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}
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} catch (error) {
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console.error("Opus 初始化失败:", error);
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return false;
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}
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}
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// 将Float32音频数据转换为Int16音频数据
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function convertFloat32ToInt16(float32Data) {
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const int16Data = new Int16Array(float32Data.length);
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for (let i = 0; i < float32Data.length; i++) {
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// 将[-1,1]范围转换为[-32768,32767]
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const s = Math.max(-1, Math.min(1, float32Data[i]));
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int16Data[i] = s < 0 ? s * 0x8000 : s * 0x7FFF;
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}
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return int16Data;
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}
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// 将Int16音频数据转换为Float32音频数据
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function convertInt16ToFloat32(int16Data) {
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const float32Data = new Float32Array(int16Data.length);
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for (let i = 0; i < int16Data.length; i++) {
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// 将[-32768,32767]范围转换为[-1,1]
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float32Data[i] = int16Data[i] / (int16Data[i] < 0 ? 0x8000 : 0x7FFF);
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}
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return float32Data;
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}
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function startRecording() {
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if (isRecording) return;
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// 确保有权限并且AudioContext是活跃的
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if (audioContext.state === 'suspended') {
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audioContext.resume().then(() => {
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console.log("AudioContext已恢复");
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continueStartRecording();
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}).catch(err => {
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console.error("恢复AudioContext失败:", err);
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statusLabel.textContent = "无法激活音频上下文，请再次点击";
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});
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} else {
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continueStartRecording();
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}
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}
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// 实际开始录音的逻辑
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function continueStartRecording() {
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// 重置录音数据
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recordedPcmData = [];
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recordedOpusData = [];
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window.audioDataBuffer = new Int16Array(0); // 重置缓冲区
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// 初始化Opus
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initOpus().then(success => {
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if (!success) {
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statusLabel.textContent = "Opus初始化失败";
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return;
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}
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console.log("开始录音，参数：", {
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sampleRate: SAMPLE_RATE,
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channels: CHANNELS,
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frameSize: FRAME_SIZE,
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bufferSize: BUFFER_SIZE
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});
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// 请求麦克风权限
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navigator.mediaDevices.getUserMedia({
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audio: {
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sampleRate: SAMPLE_RATE,
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channelCount: CHANNELS,
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echoCancellation: true,
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noiseSuppression: true,
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autoGainControl: true
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}
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})
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.then(stream => {
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console.log("获取到麦克风流，实际参数：", stream.getAudioTracks()[0].getSettings());
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// 检查流是否有效
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if (!stream || !stream.getAudioTracks().length || !stream.getAudioTracks()[0].enabled) {
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throw new Error("获取到的音频流无效");
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}
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mediaStream = stream;
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mediaSource = audioContext.createMediaStreamSource(stream);
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// 创建ScriptProcessor(虽然已弃用，但兼容性好)
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// 在降级到ScriptProcessor之前尝试使用AudioWorklet
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createAudioProcessor().then(processor => {
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if (processor) {
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console.log("使用AudioWorklet处理音频");
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audioProcessor = processor;
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// 连接音频处理链
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mediaSource.connect(audioProcessor);
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audioProcessor.connect(audioContext.destination);
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} else {
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console.log("回退到ScriptProcessor");
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// 创建ScriptProcessor节点
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audioProcessor = audioContext.createScriptProcessor(BUFFER_SIZE, CHANNELS, CHANNELS);
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// 处理音频数据
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audioProcessor.onaudioprocess = processAudioData;
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// 连接音频处理链
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mediaSource.connect(audioProcessor);
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audioProcessor.connect(audioContext.destination);
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}
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// 更新UI
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isRecording = true;
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statusLabel.textContent = "录音中...";
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startButton.disabled = true;
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stopButton.disabled = false;
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playButton.disabled = true;
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}).catch(error => {
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console.error("创建音频处理器失败:", error);
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statusLabel.textContent = "创建音频处理器失败";
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});
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})
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.catch(error => {
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console.error("获取麦克风失败:", error);
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statusLabel.textContent = "获取麦克风失败: " + error.message;
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});
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});
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}
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// 创建AudioWorklet处理器
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async function createAudioProcessor() {
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try {
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// 尝试使用更现代的AudioWorklet API
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if ('AudioWorklet' in window && 'AudioWorkletNode' in window) {
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// 定义AudioWorklet处理器代码
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const workletCode = `
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class OpusRecorderProcessor extends AudioWorkletProcessor {
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constructor() {
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super();
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this.buffers = [];
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this.frameSize = ${FRAME_SIZE};
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this.buffer = new Float32Array(this.frameSize);
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this.bufferIndex = 0;
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this.isRecording = false;
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this.port.onmessage = (event) => {
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if (event.data.command === 'start') {
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this.isRecording = true;
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} else if (event.data.command === 'stop') {
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this.isRecording = false;
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// 发送最后的缓冲区
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if (this.bufferIndex > 0) {
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const finalBuffer = this.buffer.slice(0, this.bufferIndex);
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this.port.postMessage({ buffer: finalBuffer });
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}
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}
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};
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}
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process(inputs, outputs) {
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if (!this.isRecording) return true;
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// 获取输入数据
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const input = inputs[0][0]; // mono channel
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if (!input || input.length === 0) return true;
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// 将输入数据添加到缓冲区
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for (let i = 0; i < input.length; i++) {
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this.buffer[this.bufferIndex++] = input[i];
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// 当缓冲区填满时，发送给主线程
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if (this.bufferIndex >= this.frameSize) {
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this.port.postMessage({ buffer: this.buffer.slice() });
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this.bufferIndex = 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('opus-recorder-processor', OpusRecorderProcessor);
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`;
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// 创建Blob URL
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const blob = new Blob([workletCode], { type: 'application/javascript' });
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const url = URL.createObjectURL(blob);
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// 加载AudioWorklet模块
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await audioContext.audioWorklet.addModule(url);
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// 创建AudioWorkletNode
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const workletNode = new AudioWorkletNode(audioContext, 'opus-recorder-processor');
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// 处理从AudioWorklet接收的消息
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workletNode.port.onmessage = (event) => {
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if (event.data.buffer) {
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// 使用与ScriptProcessor相同的处理逻辑
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processAudioData({
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inputBuffer: {
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getChannelData: () => event.data.buffer
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}
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});
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}
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};
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// 启动录音
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workletNode.port.postMessage({ command: 'start' });
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// 保存停止函数
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workletNode.stopRecording = () => {
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workletNode.port.postMessage({ command: 'stop' });
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};
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console.log("AudioWorklet 音频处理器创建成功");
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return workletNode;
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}
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} catch (error) {
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console.error("创建AudioWorklet失败，将使用ScriptProcessor:", error);
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}
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// 如果AudioWorklet不可用或失败，返回null以便回退到ScriptProcessor
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return null;
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}
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// 处理音频数据
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function processAudioData(e) {
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// 获取输入缓冲区
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const inputBuffer = e.inputBuffer;
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// 获取第一个通道的Float32数据
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const inputData = inputBuffer.getChannelData(0);
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// 添加调试信息
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const nonZeroCount = Array.from(inputData).filter(x => Math.abs(x) > 0.001).length;
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console.log(`接收到音频数据: ${inputData.length} 个样本, 非零样本数: ${nonZeroCount}`);
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// 如果全是0，可能是麦克风没有正确获取声音
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if (nonZeroCount < 5) {
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console.warn("警告: 检测到大量静音样本，请检查麦克风是否正常工作");
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// 继续处理，以防有些样本确实是静音
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}
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// 存储PCM数据用于调试
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recordedPcmData.push(new Float32Array(inputData));
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// 转换为Int16数据供Opus编码
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const int16Data = convertFloat32ToInt16(inputData);
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// 如果收集到的数据不是FRAME_SIZE的整数倍，需要进行处理
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// 创建静态缓冲区来存储不足一帧的数据
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if (!window.audioDataBuffer) {
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window.audioDataBuffer = new Int16Array(0);
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}
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// 合并之前缓存的数据和新数据
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const combinedData = new Int16Array(window.audioDataBuffer.length + int16Data.length);
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combinedData.set(window.audioDataBuffer);
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combinedData.set(int16Data, window.audioDataBuffer.length);
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// 处理完整帧
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const frameCount = Math.floor(combinedData.length / FRAME_SIZE);
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console.log(`可编码的完整帧数: ${frameCount}, 缓冲区总大小: ${combinedData.length}`);
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for (let i = 0; i < frameCount; i++) {
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const frameData = combinedData.subarray(i * FRAME_SIZE, (i + 1) * FRAME_SIZE);
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try {
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console.log(`编码第 ${i+1}/${frameCount} 帧, 帧大小: ${frameData.length}`);
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const encodedData = opusEncoder.encode(frameData);
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if (encodedData) {
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console.log(`编码成功: ${encodedData.length} 字节`);
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recordedOpusData.push(encodedData);
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}
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} catch (error) {
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console.error(`Opus编码帧 ${i+1} 失败:`, error);
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}
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}
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// 保存剩余不足一帧的数据
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const remainingSamples = combinedData.length % FRAME_SIZE;
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if (remainingSamples > 0) {
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window.audioDataBuffer = combinedData.subarray(frameCount * FRAME_SIZE);
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console.log(`保留 ${remainingSamples} 个样本到下一次处理`);
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} else {
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window.audioDataBuffer = new Int16Array(0);
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}
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}
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function stopRecording() {
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if (!isRecording) return;
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// 处理剩余的缓冲数据
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if (window.audioDataBuffer && window.audioDataBuffer.length > 0) {
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console.log(`停止录音，处理剩余的 ${window.audioDataBuffer.length} 个样本`);
|
||
// 如果剩余数据不足一帧，可以通过补零的方式凑成一帧
|
||
if (window.audioDataBuffer.length < FRAME_SIZE) {
|
||
const paddedFrame = new Int16Array(FRAME_SIZE);
|
||
paddedFrame.set(window.audioDataBuffer);
|
||
// 剩余部分填充为0
|
||
for (let i = window.audioDataBuffer.length; i < FRAME_SIZE; i++) {
|
||
paddedFrame[i] = 0;
|
||
}
|
||
try {
|
||
console.log(`编码最后一帧(补零): ${paddedFrame.length} 样本`);
|
||
const encodedData = opusEncoder.encode(paddedFrame);
|
||
if (encodedData) {
|
||
recordedOpusData.push(encodedData);
|
||
}
|
||
} catch (error) {
|
||
console.error("最后一帧Opus编码失败:", error);
|
||
}
|
||
} else {
|
||
// 如果数据超过一帧，按正常流程处理
|
||
processAudioData({
|
||
inputBuffer: {
|
||
getChannelData: () => convertInt16ToFloat32(window.audioDataBuffer)
|
||
}
|
||
});
|
||
}
|
||
window.audioDataBuffer = null;
|
||
}
|
||
|
||
// 如果使用的是AudioWorklet，调用其特定的停止方法
|
||
if (audioProcessor && typeof audioProcessor.stopRecording === 'function') {
|
||
audioProcessor.stopRecording();
|
||
}
|
||
|
||
// 停止麦克风
|
||
if (mediaStream) {
|
||
mediaStream.getTracks().forEach(track => track.stop());
|
||
}
|
||
|
||
// 断开音频处理链
|
||
if (audioProcessor) {
|
||
try {
|
||
audioProcessor.disconnect();
|
||
if (mediaSource) mediaSource.disconnect();
|
||
} catch (error) {
|
||
console.warn("断开音频处理链时出错:", error);
|
||
}
|
||
}
|
||
|
||
// 更新UI
|
||
isRecording = false;
|
||
statusLabel.textContent = "已停止录音，收集了 " + recordedOpusData.length + " 帧Opus数据";
|
||
startButton.disabled = false;
|
||
stopButton.disabled = true;
|
||
playButton.disabled = recordedOpusData.length === 0;
|
||
|
||
console.log("录制完成:",
|
||
"PCM帧数:", recordedPcmData.length,
|
||
"Opus帧数:", recordedOpusData.length);
|
||
}
|
||
|
||
function playRecording() {
|
||
if (!recordedOpusData.length) {
|
||
statusLabel.textContent = "没有可播放的录音";
|
||
return;
|
||
}
|
||
|
||
// 将所有Opus数据解码为PCM
|
||
let allDecodedData = [];
|
||
|
||
for (const opusData of recordedOpusData) {
|
||
try {
|
||
// 解码为Int16数据
|
||
const decodedData = opusDecoder.decode(opusData);
|
||
|
||
if (decodedData && decodedData.length > 0) {
|
||
// 将Int16数据转换为Float32
|
||
const float32Data = convertInt16ToFloat32(decodedData);
|
||
|
||
// 添加到总解码数据中
|
||
allDecodedData.push(...float32Data);
|
||
}
|
||
} catch (error) {
|
||
console.error("Opus解码失败:", error);
|
||
}
|
||
}
|
||
|
||
// 如果没有解码出数据，返回
|
||
if (allDecodedData.length === 0) {
|
||
statusLabel.textContent = "解码失败，无法播放";
|
||
return;
|
||
}
|
||
|
||
// 创建音频缓冲区
|
||
const audioBuffer = audioContext.createBuffer(CHANNELS, allDecodedData.length, SAMPLE_RATE);
|
||
audioBuffer.copyToChannel(new Float32Array(allDecodedData), 0);
|
||
|
||
// 创建音频源并播放
|
||
const source = audioContext.createBufferSource();
|
||
source.buffer = audioBuffer;
|
||
source.connect(audioContext.destination);
|
||
source.start();
|
||
|
||
// 更新UI
|
||
statusLabel.textContent = "正在播放...";
|
||
playButton.disabled = true;
|
||
|
||
// 播放结束后恢复UI
|
||
source.onended = () => {
|
||
statusLabel.textContent = "播放完毕";
|
||
playButton.disabled = false;
|
||
};
|
||
}
|
||
|
||
// 模拟服务端返回的Opus数据进行解码播放
|
||
function playOpusFromServer(opusData) {
|
||
// 这个函数展示如何处理服务端返回的opus数据
|
||
// opusData应该是一个包含opus帧的数组
|
||
|
||
if (!opusDecoder) {
|
||
initOpus().then(success => {
|
||
if (success) {
|
||
decodeAndPlayOpusData(opusData);
|
||
} else {
|
||
statusLabel.textContent = "Opus解码器初始化失败";
|
||
}
|
||
});
|
||
} else {
|
||
decodeAndPlayOpusData(opusData);
|
||
}
|
||
}
|
||
|
||
function decodeAndPlayOpusData(opusData) {
|
||
let allDecodedData = [];
|
||
|
||
for (const frame of opusData) {
|
||
try {
|
||
const decodedData = opusDecoder.decode(frame);
|
||
if (decodedData && decodedData.length > 0) {
|
||
const float32Data = convertInt16ToFloat32(decodedData);
|
||
allDecodedData.push(...float32Data);
|
||
}
|
||
} catch (error) {
|
||
console.error("服务端Opus数据解码失败:", error);
|
||
}
|
||
}
|
||
|
||
if (allDecodedData.length === 0) {
|
||
statusLabel.textContent = "服务端数据解码失败";
|
||
return;
|
||
}
|
||
|
||
const audioBuffer = audioContext.createBuffer(CHANNELS, allDecodedData.length, SAMPLE_RATE);
|
||
audioBuffer.copyToChannel(new Float32Array(allDecodedData), 0);
|
||
|
||
const source = audioContext.createBufferSource();
|
||
source.buffer = audioBuffer;
|
||
source.connect(audioContext.destination);
|
||
source.start();
|
||
|
||
statusLabel.textContent = "正在播放服务端数据...";
|
||
source.onended = () => statusLabel.textContent = "服务端数据播放完毕";
|
||
}
|