PCMPlayer播放器的使用教程（添加清理暂存区方法）

本文主要是介绍PCMPlayer播放器的使用教程（添加清理暂存区方法），希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

 解决的问题：在我们使用PCMPlayer播放的时候，时间长，即使停止播放了，也会有一段声音，这是因为音频暂存区没有清理 

解决方案：添加一个stop方法，话不多上 直接上代码  复制就能使用 ！！！

function PCMPlayer(option) {this.init(option);
}PCMPlayer.prototype.init = function(option) {var defaults = {encoding: '16bitInt',channels: 1,sampleRate: 8000,flushingTime: 1000};this.option = Object.assign({}, defaults, option);this.samples = new Float32Array();this.flush = this.flush.bind(this);this.interval = setInterval(this.flush, this.option.flushingTime);this.maxValue = this.getMaxValue();this.typedArray = this.getTypedArray();this.createContext();
};PCMPlayer.prototype.getMaxValue = function () {var encodings = {'8bitInt': 128,'16bitInt': 32768,'32bitInt': 2147483648,'32bitFloat': 1};return encodings[this.option.encoding] ? encodings[this.option.encoding] : encodings['16bitInt'];
};PCMPlayer.prototype.getTypedArray = function () {var typedArrays = {'8bitInt': Int8Array,'16bitInt': Int16Array,'32bitInt': Int32Array,'32bitFloat': Float32Array};return typedArrays[this.option.encoding] ? typedArrays[this.option.encoding] : typedArrays['16bitInt'];
};PCMPlayer.prototype.createContext = function() {this.audioCtx = new (window.AudioContext || window.webkitAudioContext)();this.gainNode = this.audioCtx.createGain();this.gainNode.gain.value = 1;this.gainNode.connect(this.audioCtx.destination);this.startTime = this.audioCtx.currentTime;
};PCMPlayer.prototype.isTypedArray = function(data) {return (data.byteLength && data.buffer && data.buffer.constructor === ArrayBuffer);
};PCMPlayer.prototype.feed = function(data) {if (!this.isTypedArray(data)) return;const formattedData = this.getFormatedValue(data);var tmp = new Float32Array(this.samples.length + formattedData.length);console.log("缓冲区tmp:" + tmp.length);tmp.set(this.samples, 0);tmp.set(formattedData, this.samples.length);this.samples = tmp;console.log("缓冲区samples:" + this.samples.length);
};PCMPlayer.prototype.getFormatedValue = function(inputData) {var data = new this.typedArray(inputData.buffer),float32 = new Float32Array(data.length),i;for (i = 0; i < data.length; i++) {float32[i] = data[i] / this.maxValue;}return float32;
};PCMPlayer.prototype.volume = function(volume) {this.gainNode.gain.value = volume;
};PCMPlayer.prototype.destroy = function() {if (this.interval) {clearInterval(this.interval);}this.samples = null;this.audioCtx.close();this.audioCtx = null;
};PCMPlayer.prototype.flush = function() {if (!this.samples.length) return;var bufferSource = this.audioCtx.createBufferSource(),length = this.samples.length / this.option.channels,audioBuffer = this.audioCtx.createBuffer(this.option.channels, length, this.option.sampleRate),audioData,channel,offset,i,decrement;for (channel = 0; channel < this.option.channels; channel++) {audioData = audioBuffer.getChannelData(channel);offset = channel;decrement = 50;for (i = 0; i < length; i++) {audioData[i] = this.samples[offset];/* fadein */if (i < 50) {audioData[i] =  (audioData[i] * i) / 50;}/* fadeout*/if (i >= (length - 51)) {audioData[i] =  (audioData[i] * decrement--) / 50;}offset += this.option.channels;}}if (this.startTime < this.audioCtx.currentTime) {this.startTime = this.audioCtx.currentTime;}console.log('start vs current ' + this.startTime + ' vs ' + this.audioCtx.currentTime + ' duration: ' + audioBuffer.duration);bufferSource.buffer = audioBuffer;bufferSource.connect(this.gainNode);bufferSource.start(this.startTime);this.startTime += audioBuffer.duration;this.samples = new Float32Array();
};PCMPlayer.prototype.stop = function() {// 清理所有缓冲区数据this.samples = new Float32Array();// 检查 AudioContext 状态并确保完全关闭if (this.audioCtx && this.audioCtx.state !== 'closed') {this.audioCtx.close().then(() => {// 确保所有音频缓冲区已停止if (this.audioCtx.state === 'closed') {setTimeout(() => {// 重新创建 AudioContextthis.audioCtx = new (window.AudioContext || window.webkitAudioContext)();this.gainNode = this.audioCtx.createGain();this.gainNode.gain.value = 1;this.gainNode.connect(this.audioCtx.destination);this.startTime = this.audioCtx.currentTime;}, 100); // 延迟 100ms 后重新创建 AudioContext}});}
};export default PCMPlayer;

使用方法：

1 初始化：

var player = new PCMPlayer({encoding: '16bitInt',channels: 1,sampleRate: 16000,flushingTime: 1000
});

2 开始播放：

            // 处理音频数据const data = new Uint8Array('传入数据源');player.feed(data);

3 停止播放，清理暂存区

 player.stop()

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