playing left and right PCM byte arrays about pcm-player HOT 7 OPEN

export 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({channelData, length}) {
    var audioSrc = this.audioCtx.createBufferSource(),
    audioBuffer = this.audioCtx.createBuffer(this.option.channels, length, this.option.sampleRate);

    for (let c = 0; c < this.option.channels; c++) {
        if (audioBuffer.copyToChannel) {
            audioBuffer.copyToChannel(channelData[c], c);
        } else {
            console.log("copyToChannel not supported")
            let audioData = audioBuffer.getChannelData(c);
            for (let i = 0; i < channelData[c].byteLength; i++) {
              audioData[i] = channelData[c][i];
            }
        }
    }

    if (this.startTime < this.audioCtx.currentTime) {
        this.startTime = this.audioCtx.currentTime;
    }

    audioSrc.buffer = audioBuffer;
    audioSrc.connect(this.gainNode);
    audioSrc.start(this.startTime);
    this.startTime += audioBuffer.duration;

    // if (!this.isTypedArray(data)) return;
    // data = this.getFormatedValue(data);
    // var tmp = new Float32Array(this.samples.length + data.length);
    // tmp.set(this.samples, 0);
    // tmp.set(data, this.samples.length);
    // this.samples = tmp;
};

if (this.startTime < this.audioCtx.currentTime) {
    this.startTime = this.audioCtx.currentTime;
}