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/*! |
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* wavefile |
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* Read & write wave files with 4, 8, 11, 12, 16, 20, 24, 32 & 64-bit data. |
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* Copyright (c) 2017-2018 Rafael da Silva Rocha. |
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* https://github.com/rochars/wavefile |
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* |
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*/ |
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/** @private */ |
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const bitDepth_ = require("bitdepth"); |
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/** @private */ |
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const riffChunks_ = require("riff-chunks"); |
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/** @private */ |
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const imaadpcm_ = require("imaadpcm"); |
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/** @private */ |
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const alawmulaw_ = require("alawmulaw"); |
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/** @private */ |
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const byteData_ = require("byte-data"); |
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/** @private */ |
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let uInt8_ = require("byte-data").uInt8; |
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/** @private */ |
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let uInt16_ = require("byte-data").uInt16; |
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/** @private */ |
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let uInt32_ = require("byte-data").uInt32; |
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/** |
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* Class representing a wav file. |
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*/ |
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class WaveFile { |
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/** |
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* @param {!Uint8Array|!Array<number>} bytes A wave file buffer. |
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* @throws {Error} If no "RIFF" chunk is found. |
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* @throws {Error} If no "fmt " chunk is found. |
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* @throws {Error} If no "fact" chunk is found and "fact" is needed. |
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* @throws {Error} If no "data" chunk is found. |
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*/ |
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constructor(bytes) { |
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/** |
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* The container identifier. |
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* Only "RIFF" and "RIFX" are supported. |
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* @type {!string} |
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*/ |
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this.container = ""; |
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/** @type {!number} */ |
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this.chunkSize = 0; |
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/** |
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* The format. |
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* Always "WAVE". |
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* @type {!string} |
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*/ |
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this.format = ""; |
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/** |
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* The data of the "fmt" chunk. |
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* @type {!Object<string, *>} |
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* @nocollapse |
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*/ |
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this.fmt = { |
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/** @type {!string} */ |
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"chunkId": "", |
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/** @type {!number} */ |
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"chunkSize": 0, |
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/** @type {!number} */ |
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"audioFormat": 0, |
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/** @type {!number} */ |
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"numChannels": 0, |
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/** @type {!number} */ |
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"sampleRate": 0, |
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/** @type {!number} */ |
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"byteRate": 0, |
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/** @type {!number} */ |
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"blockAlign": 0, |
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/** @type {!number} */ |
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"bitsPerSample": 0, |
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/** @type {!number} */ |
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"cbSize": 0, |
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/** @type {!number} */ |
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"validBitsPerSample": 0, |
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/** @type {!number} */ |
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"dwChannelMask": 0, |
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/** |
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* 4 32-bit values representing a 128-bit ID |
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* @type {!Array<number>} |
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*/ |
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"subformat": [] |
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}; |
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/** |
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* The data of the "fact" chunk. |
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* @type {!Object<string, *>} |
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* @nocollapse |
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*/ |
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this.fact = { |
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/** @type {!string} */ |
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"chunkId": "", |
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/** @type {!number} */ |
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"chunkSize": 0, |
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/** @type {!number} */ |
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"dwSampleLength": 0 |
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}; |
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/** |
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* The data of the "cue " chunk. |
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* @type {!Object<string, *>} |
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* @nocollapse |
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*/ |
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this.cue = { |
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/** @type {!string} */ |
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"chunkId": "", |
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/** @type {!number} */ |
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"chunkSize": 0, |
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/** @type {!Array<number>} */ |
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"chunkData_": [] |
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}; |
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/** |
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* The data of the "bext" chunk. |
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* @type {!Object<string, *>} |
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* @nocollapse |
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*/ |
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this.bext = { |
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/** @type {!string} */ |
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"chunkId": "", |
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/** @type {!number} */ |
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"chunkSize": 0, |
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/** @type {!string} */ |
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"description": "", //256 |
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/** @type {!string} */ |
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"originator": "", //32 |
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/** @type {!string} */ |
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"originatorReference": "", //32 |
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/** @type {!string} */ |
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"originationDate": "", //10 |
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/** @type {!string} */ |
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"originationTime": "", //8 |
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/** |
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* 2 32-bit values, timeReference high and low |
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* @type {!Array<number>} |
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*/ |
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"timeReference": [], |
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/** @type {number} */ |
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"version": 0, //WORD |
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/** @type {!string} */ |
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"UMID": "", // 64 chars |
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/** @type {!number} */ |
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"loudnessValue": 0, //WORD |
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/** @type {!number} */ |
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"loudnessRange": 0, //WORD |
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/** @type {!number} */ |
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"maxTruePeakLevel": 0, //WORD |
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/** @type {!number} */ |
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"maxMomentaryLoudness": 0, //WORD |
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/** @type {!number} */ |
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"maxShortTermLoudness": 0, //WORD |
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/** @type {!string} */ |
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"reserved": "", //180 |
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/** @type {!string} */ |
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"codingHistory": "" // string, unlimited |
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}; |
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/** |
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* The data of the "ds64" chunk. |
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* Used only with RF64 files. |
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* @type {!Object<string, *>} |
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* @nocollapse |
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*/ |
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this.ds64 = { |
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/** @type {!string} */ |
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"chunkId": "", |
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/** @type {!number} */ |
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"riffSizeHigh": 0, // DWORD |
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/** @type {!number} */ |
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"riffSizeLow": 0, // DWORD |
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/** @type {!number} */ |
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"dataSizeHigh": 0, // DWORD |
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/** @type {!number} */ |
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"dataSizeLow": 0, // DWORD |
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/** @type {!number} */ |
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"originationTime": 0, // DWORD |
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/** @type {!number} */ |
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"sampleCountHigh": 0, // DWORD |
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/** @type {!number} */ |
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"sampleCountLow": 0, // DWORD |
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/** @type {!number} */ |
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"tableLength": 0, // DWORD |
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/** @type {!Array} */ |
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"table": [] |
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}; |
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/** |
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* The data of the "data" chunk. |
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* @type {!Object<string, *>} |
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* @nocollapse |
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*/ |
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this.data = { |
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/** @type {!string} */ |
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"chunkId": "", |
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/** @type {!number} */ |
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"chunkSize": 0, |
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/** @type {!Array<number>} */ |
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"samples": [] |
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}; |
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/** |
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* @type {!string} |
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*/ |
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this.bitDepth = "0"; |
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/** |
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* Header formats. |
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* Formats not listed here will be 65534. |
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* @enum {number} |
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* @const |
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*/ |
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this.headerFormats_ = { |
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"4": 17, |
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"8": 1, |
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"8a": 6, |
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"8m": 7, |
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"16": 1, |
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"24": 1, |
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"32": 1, |
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"32f": 3, |
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"40": 65534, |
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"48": 65534, |
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"64": 3 |
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}; |
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/** |
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* @type {!number} |
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* @private |
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*/ |
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this.head_ = 0; |
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/** |
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* If the "fact" chunk should be enforced or not. |
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* @type {!boolean} |
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*/ |
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this.enforceFact_ = false; |
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/** |
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* If the data in data.samples is interleaved or not. |
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* @type {!boolean} |
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*/ |
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this.isInterleaved = true; |
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if(bytes) { |
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this.fromBuffer(bytes); |
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} |
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} |
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/** |
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* Set up a WaveFile object based on the arguments passed. |
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* @param {!number} numChannels The number of channels |
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* (Integer numbers: 1 for mono, 2 stereo and so on). |
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* @param {!number} sampleRate The sample rate. |
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255
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* Integer numbers like 8000, 44100, 48000, 96000, 192000. |
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256
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* @param {!string} bitDepth The audio bit depth. |
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* One of "4", "8", "8a", "8m", "16", "24", "32", "32f", "64" |
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* or any value between "8" and "32". |
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* @param {!Array<number>} samples Array of samples to be written. |
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* The samples must be in the correct range according to the |
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* bit depth. |
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* @throws {Error} If any argument does not meet the criteria. |
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*/ |
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fromScratch(numChannels, sampleRate, bitDepth, samples, options={}) { |
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if (!options["container"]) { |
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options["container"] = "RIFF"; |
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} |
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269
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// closest nuber of bytes if not / 8 |
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let numBytes = (((parseInt(bitDepth, 10) - 1) | 7) + 1) / 8; |
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this.clearHeader_(); |
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this.bitDepth = bitDepth; |
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274
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// Normal PCM file header |
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this.container = options["container"]; |
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this.chunkSize = 36 + samples.length * numBytes; |
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this.format = "WAVE"; |
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278
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this.fmt.chunkId = "fmt "; |
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279
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this.fmt.chunkSize = 16; |
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this.fmt.byteRate = (numChannels * numBytes) * sampleRate; |
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281
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this.fmt.blockAlign = numChannels * numBytes; |
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282
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this.fmt.audioFormat = this.headerFormats_[bitDepth] ? |
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this.headerFormats_[bitDepth] : 65534; |
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284
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this.fmt.numChannels = numChannels; |
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285
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this.fmt.sampleRate = sampleRate; |
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286
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this.fmt.bitsPerSample = parseInt(bitDepth, 10); |
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this.data.chunkId = "data"; |
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288
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this.data.samples = samples; |
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289
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// interleave the samples if they were passed de-interleaved |
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if (samples.length > 0) { |
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291
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if (samples[0].constructor === Array) { |
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292
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this.isInterleaved = false; |
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this.interleave(); |
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294
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} |
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295
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} |
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296
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this.data.chunkSize = samples.length * numBytes; |
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297
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298
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// IMA ADPCM header |
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299
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if (bitDepth == "4") { |
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300
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this.chunkSize = 44 + samples.length; |
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301
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this.fmt.chunkSize = 20; |
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302
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this.fmt.byteRate = 4055; |
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303
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this.fmt.blockAlign = 256; |
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304
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this.fmt.bitsPerSample = 4; |
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305
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this.fmt.cbSize = 2; |
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306
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this.fmt.validBitsPerSample = 505; |
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307
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this.fact.chunkId = "fact"; |
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308
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this.fact.chunkSize = 4; |
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309
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this.fact.dwSampleLength = samples.length * 2; |
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310
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this.data.chunkSize = samples.length; |
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311
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} |
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312
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// A-Law and mu-Law header |
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313
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if (bitDepth == "8a" || bitDepth == "8m") { |
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314
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this.chunkSize = 44 + samples.length; |
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315
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this.fmt.chunkSize = 20; |
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316
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this.fmt.cbSize = 2; |
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317
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this.fmt.validBitsPerSample = 8; |
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318
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this.fact.chunkId = "fact"; |
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319
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this.fact.chunkSize = 4; |
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320
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this.fact.dwSampleLength = samples.length; |
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321
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} |
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322
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// WAVE_FORMAT_EXTENSIBLE |
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323
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if (this.fmt.audioFormat == 65534) { |
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324
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|
|
this.chunkSize = 36 + 24 + samples.length * numBytes; |
|
325
|
|
|
this.fmt.chunkSize = 40; |
|
326
|
|
|
this.fmt.bitsPerSample = ((parseInt(bitDepth, 10) - 1) | 7) + 1; |
|
327
|
|
|
this.fmt.cbSize = 22; |
|
328
|
|
|
this.fmt.validBitsPerSample = parseInt(bitDepth, 10); |
|
329
|
|
|
this.fmt.dwChannelMask = 0; |
|
330
|
|
|
// subformat 128-bit GUID as 4 32-bit values |
|
331
|
|
|
// only supports uncompressed integer PCM samples |
|
332
|
|
|
this.fmt.subformat = [1, 1048576, 2852126848, 1905997824]; |
|
333
|
|
|
} |
|
334
|
|
|
} |
|
335
|
|
|
|
|
336
|
|
|
/** |
|
337
|
|
|
* Init a WaveFile object from a byte buffer. |
|
338
|
|
|
* @param {!Uint8Array|!Array<number>} bytes The buffer. |
|
339
|
|
|
* @throws {Error} If container is not RIFF or RIFX. |
|
340
|
|
|
* @throws {Error} If no "fmt " chunk is found. |
|
341
|
|
|
* @throws {Error} If no "fact" chunk is found and "fact" is needed. |
|
342
|
|
|
* @throws {Error} If no "data" chunk is found. |
|
343
|
|
|
*/ |
|
344
|
|
|
fromBuffer(bytes) { |
|
345
|
|
|
this.readRIFFChunk_(bytes); |
|
346
|
|
|
let bigEndian = this.container == "RIFX"; |
|
347
|
|
|
let chunk = riffChunks_.read(bytes, bigEndian); |
|
348
|
|
|
this.readFmtChunk_(chunk["subChunks"]); |
|
349
|
|
|
this.readFactChunk_(chunk["subChunks"]); |
|
350
|
|
|
this.readBextChunk_(chunk["subChunks"]); |
|
351
|
|
|
this.readCueChunk_(chunk["subChunks"]); |
|
352
|
|
|
this.readDataChunk_( |
|
353
|
|
|
chunk["subChunks"], |
|
354
|
|
|
{"be": bigEndian, "single": true}); |
|
355
|
|
|
if (this.fmt.audioFormat == 3 && this.fmt.bitsPerSample == 32) { |
|
356
|
|
|
this.bitDepth = "32f"; |
|
357
|
|
|
} else if (this.fmt.audioFormat == 6) { |
|
358
|
|
|
this.bitDepth = "8a"; |
|
359
|
|
|
} else if (this.fmt.audioFormat == 7) { |
|
360
|
|
|
this.bitDepth = "8m"; |
|
361
|
|
|
} else { |
|
362
|
|
|
this.bitDepth = this.fmt.bitsPerSample.toString(); |
|
363
|
|
|
} |
|
364
|
|
|
} |
|
365
|
|
|
|
|
366
|
|
|
/** |
|
367
|
|
|
* Return a byte buffer representig the WaveFile object as a wav file. |
|
368
|
|
|
* @return {Uint8Array} |
|
369
|
|
|
* @throws {Error} If any property of the object appears invalid. |
|
370
|
|
|
*/ |
|
371
|
|
|
toBuffer() { |
|
372
|
|
|
this.checkWriteInput_(); |
|
373
|
|
|
this.assureInterleaved_(); |
|
374
|
|
|
return new Uint8Array(this.createWaveFile_()); |
|
375
|
|
|
} |
|
376
|
|
|
|
|
377
|
|
|
/** |
|
378
|
|
|
* Turn the file to RIFF. |
|
379
|
|
|
*/ |
|
380
|
|
|
toRIFF() { |
|
381
|
|
|
this.container = "RIFF"; |
|
382
|
|
|
this.LEorBE_(); |
|
383
|
|
|
} |
|
384
|
|
|
|
|
385
|
|
|
/** |
|
386
|
|
|
* Turn the file to RIFX. |
|
387
|
|
|
*/ |
|
388
|
|
|
toRIFX() { |
|
389
|
|
|
this.container = "RIFX"; |
|
390
|
|
|
this.LEorBE_(); |
|
391
|
|
|
} |
|
392
|
|
|
|
|
393
|
|
|
/** |
|
394
|
|
|
* Change the bit depth of the samples. |
|
395
|
|
|
* @param {!string} bitDepth The new bit depth of the samples. |
|
396
|
|
|
* One of "8" ... "32" (integers), "32f" or "64" (floats) |
|
397
|
|
|
* @param {!boolean} changeResolution A boolean indicating if the |
|
398
|
|
|
* resolution of samples should be actually changed or not. |
|
399
|
|
|
* @throws {Error} If the bit depth is not valid. |
|
400
|
|
|
*/ |
|
401
|
|
|
toBitDepth(bitDepth, changeResolution=true) { |
|
402
|
|
|
let toBitDepth = bitDepth; |
|
403
|
|
|
let thisBitDepth = this.bitDepth; |
|
404
|
|
|
if (!changeResolution) { |
|
405
|
|
|
toBitDepth = this.realBitDepth_(bitDepth); |
|
406
|
|
|
thisBitDepth = this.realBitDepth_(this.bitDepth); |
|
407
|
|
|
} |
|
408
|
|
|
this.assureInterleaved_(); |
|
409
|
|
|
bitDepth_.toBitDepth(this.data.samples, thisBitDepth, toBitDepth); |
|
410
|
|
|
this.fromScratch( |
|
411
|
|
|
this.fmt.numChannels, |
|
412
|
|
|
this.fmt.sampleRate, |
|
413
|
|
|
bitDepth, |
|
414
|
|
|
this.data.samples, |
|
415
|
|
|
{"container": this.container} |
|
416
|
|
|
); |
|
417
|
|
|
} |
|
418
|
|
|
|
|
419
|
|
|
/** |
|
420
|
|
|
* Interleave multi-channel samples. |
|
421
|
|
|
*/ |
|
422
|
|
|
interleave() { |
|
423
|
|
|
if (!this.isInterleaved) { |
|
424
|
|
|
let finalSamples = []; |
|
425
|
|
|
let numChannels = this.data.samples[0].length; |
|
426
|
|
|
for (let i = 0; i < numChannels; i++) { |
|
427
|
|
|
for (let j = 0; j < this.data.samples.length; j++) { |
|
428
|
|
|
finalSamples.push(this.data.samples[j][i]); |
|
429
|
|
|
} |
|
430
|
|
|
} |
|
431
|
|
|
this.data.samples = finalSamples; |
|
432
|
|
|
this.isInterleaved = true; |
|
433
|
|
|
} |
|
434
|
|
|
} |
|
435
|
|
|
|
|
436
|
|
|
/** |
|
437
|
|
|
* De-interleave samples into multiple channels. |
|
438
|
|
|
*/ |
|
439
|
|
|
deInterleave() { |
|
440
|
|
|
if (this.isInterleaved) { |
|
441
|
|
|
let finalSamples = []; |
|
442
|
|
|
let i; |
|
443
|
|
|
for (i = 0; i < this.fmt.numChannels; i++) { |
|
444
|
|
|
finalSamples[i] = []; |
|
445
|
|
|
} |
|
446
|
|
|
i = 0; |
|
447
|
|
|
let j; |
|
448
|
|
|
while (i < this.data.samples.length) { |
|
449
|
|
|
for (j = 0; j < this.fmt.numChannels; j++) { |
|
450
|
|
|
finalSamples[j].push(this.data.samples[i+j]); |
|
451
|
|
|
} |
|
452
|
|
|
i += j; |
|
453
|
|
|
} |
|
454
|
|
|
this.data.samples = finalSamples; |
|
455
|
|
|
this.isInterleaved = false; |
|
456
|
|
|
} |
|
457
|
|
|
} |
|
458
|
|
|
|
|
459
|
|
|
/** |
|
460
|
|
|
* Encode a 16-bit wave file as 4-bit IMA ADPCM. |
|
461
|
|
|
* @throws {Error} If sample rate is not 8000. |
|
462
|
|
|
* @throws {Error} If number of channels is not 1. |
|
463
|
|
|
*/ |
|
464
|
|
|
toIMAADPCM() { |
|
465
|
|
|
if (this.fmt.sampleRate != 8000) { |
|
466
|
|
|
throw new Error( |
|
467
|
|
|
"Only 8000 Hz files can be compressed as IMA-ADPCM."); |
|
468
|
|
|
} else if(this.fmt.numChannels != 1) { |
|
469
|
|
|
throw new Error( |
|
470
|
|
|
"Only mono files can be compressed as IMA-ADPCM."); |
|
471
|
|
|
} else { |
|
472
|
|
|
this.assure16Bit_(); |
|
473
|
|
|
this.fromScratch( |
|
474
|
|
|
this.fmt.numChannels, |
|
475
|
|
|
this.fmt.sampleRate, |
|
476
|
|
|
"4", |
|
477
|
|
|
imaadpcm_.encode(this.data.samples), |
|
478
|
|
|
{"container": this.container} |
|
479
|
|
|
); |
|
480
|
|
|
} |
|
481
|
|
|
} |
|
482
|
|
|
|
|
483
|
|
|
/** |
|
484
|
|
|
* Decode a 4-bit IMA ADPCM wave file as a 16-bit wave file. |
|
485
|
|
|
*/ |
|
486
|
|
|
fromIMAADPCM() { |
|
487
|
|
|
this.fromScratch( |
|
488
|
|
|
this.fmt.numChannels, |
|
489
|
|
|
this.fmt.sampleRate, |
|
490
|
|
|
"16", |
|
491
|
|
|
imaadpcm_.decode(this.data.samples, this.fmt.blockAlign), |
|
492
|
|
|
{"container": this.container} |
|
493
|
|
|
); |
|
494
|
|
|
} |
|
495
|
|
|
|
|
496
|
|
|
/** |
|
497
|
|
|
* Encode 16-bit wave file as 8-bit A-Law. |
|
498
|
|
|
*/ |
|
499
|
|
|
toALaw() { |
|
500
|
|
|
this.assure16Bit_(); |
|
501
|
|
|
this.assureInterleaved_(); |
|
502
|
|
|
this.fromScratch( |
|
503
|
|
|
this.fmt.numChannels, |
|
504
|
|
|
this.fmt.sampleRate, |
|
505
|
|
|
"8a", |
|
506
|
|
|
alawmulaw_.alaw.encode(this.data.samples), |
|
507
|
|
|
{"container": this.container} |
|
508
|
|
|
); |
|
509
|
|
|
} |
|
510
|
|
|
|
|
511
|
|
|
/** |
|
512
|
|
|
* Decode a 8-bit A-Law wave file into a 16-bit wave file. |
|
513
|
|
|
*/ |
|
514
|
|
|
fromALaw() { |
|
515
|
|
|
this.fromScratch( |
|
516
|
|
|
this.fmt.numChannels, |
|
517
|
|
|
this.fmt.sampleRate, |
|
518
|
|
|
"16", |
|
519
|
|
|
alawmulaw_.alaw.decode(this.data.samples), |
|
520
|
|
|
{"container": this.container} |
|
521
|
|
|
); |
|
522
|
|
|
} |
|
523
|
|
|
|
|
524
|
|
|
/** |
|
525
|
|
|
* Encode 16-bit wave file as 8-bit mu-Law. |
|
526
|
|
|
*/ |
|
527
|
|
|
toMuLaw() { |
|
528
|
|
|
this.assure16Bit_(); |
|
529
|
|
|
this.assureInterleaved_(); |
|
530
|
|
|
this.fromScratch( |
|
531
|
|
|
this.fmt.numChannels, |
|
532
|
|
|
this.fmt.sampleRate, |
|
533
|
|
|
"8m", |
|
534
|
|
|
alawmulaw_.mulaw.encode(this.data.samples), |
|
535
|
|
|
{"container": this.container} |
|
536
|
|
|
); |
|
537
|
|
|
} |
|
538
|
|
|
|
|
539
|
|
|
/** |
|
540
|
|
|
* Decode a 8-bit mu-Law wave file into a 16-bit wave file. |
|
541
|
|
|
*/ |
|
542
|
|
|
fromMuLaw() { |
|
543
|
|
|
this.fromScratch( |
|
544
|
|
|
this.fmt.numChannels, |
|
545
|
|
|
this.fmt.sampleRate, |
|
546
|
|
|
"16", |
|
547
|
|
|
alawmulaw_.mulaw.decode(this.data.samples), |
|
548
|
|
|
{"container": this.container} |
|
549
|
|
|
); |
|
550
|
|
|
} |
|
551
|
|
|
|
|
552
|
|
|
/** |
|
553
|
|
|
* Get the closest greater number of bits for a number of bits that |
|
554
|
|
|
* do not fill a full sequence of bytes. |
|
555
|
|
|
* @param {!string} bitDepth The bit depth. |
|
556
|
|
|
* @return {string} |
|
557
|
|
|
*/ |
|
558
|
|
|
realBitDepth_(bitDepth) { |
|
559
|
|
|
if (bitDepth != "32f") { |
|
560
|
|
|
bitDepth = (((parseInt(bitDepth, 10) - 1) | 7) + 1).toString(); |
|
561
|
|
|
} |
|
562
|
|
|
return bitDepth; |
|
563
|
|
|
} |
|
564
|
|
|
|
|
565
|
|
|
/** |
|
566
|
|
|
* Validate the input for wav writing. |
|
567
|
|
|
* @throws {Error} If any property of the object appears invalid. |
|
568
|
|
|
* @private |
|
569
|
|
|
*/ |
|
570
|
|
|
checkWriteInput_() { |
|
571
|
|
|
this.validateBitDepth_(); |
|
572
|
|
|
this.validateNumChannels_(); |
|
573
|
|
|
this.validateSampleRate_(); |
|
574
|
|
|
} |
|
575
|
|
|
|
|
576
|
|
|
/** |
|
577
|
|
|
* Validate the bit depth. |
|
578
|
|
|
* @throws {Error} If bit depth is invalid. |
|
579
|
|
|
* @private |
|
580
|
|
|
*/ |
|
581
|
|
|
validateBitDepth_() { |
|
582
|
|
|
if (!this.headerFormats_[this.bitDepth]) { |
|
583
|
|
|
if (parseInt(this.bitDepth, 10) > 8 && |
|
584
|
|
|
parseInt(this.bitDepth, 10) < 54) { |
|
585
|
|
|
return true; |
|
586
|
|
|
} |
|
587
|
|
|
throw new Error("Invalid bit depth."); |
|
588
|
|
|
} |
|
589
|
|
|
return true; |
|
590
|
|
|
} |
|
591
|
|
|
|
|
592
|
|
|
/** |
|
593
|
|
|
* Validate the number of channels. |
|
594
|
|
|
* @throws {Error} If the number of channels is invalid. |
|
595
|
|
|
* @private |
|
596
|
|
|
*/ |
|
597
|
|
|
validateNumChannels_() { |
|
598
|
|
|
let blockAlign = this.fmt.numChannels * this.fmt.bitsPerSample / 8; |
|
599
|
|
|
if (this.fmt.numChannels < 1 || blockAlign > 65535) { |
|
600
|
|
|
throw new Error("Invalid number of channels."); |
|
601
|
|
|
} |
|
602
|
|
|
return true; |
|
603
|
|
|
} |
|
604
|
|
|
|
|
605
|
|
|
/** |
|
606
|
|
|
* Validate the sample rate value. |
|
607
|
|
|
* @throws {Error} If the sample rate is invalid. |
|
608
|
|
|
* @private |
|
609
|
|
|
*/ |
|
610
|
|
|
validateSampleRate_() { |
|
611
|
|
|
let byteRate = this.fmt.numChannels * |
|
612
|
|
|
(this.fmt.bitsPerSample / 8) * this.fmt.sampleRate; |
|
613
|
|
|
if (this.fmt.sampleRate < 1 || byteRate > 4294967295) { |
|
614
|
|
|
throw new Error("Invalid sample rate."); |
|
615
|
|
|
} |
|
616
|
|
|
return true; |
|
617
|
|
|
} |
|
618
|
|
|
|
|
619
|
|
|
/** |
|
620
|
|
|
* Reset the attributes related to the "fact" chunk. |
|
621
|
|
|
* @private |
|
622
|
|
|
*/ |
|
623
|
|
|
clearHeader_() { |
|
624
|
|
|
this.fmt.cbSize = 0; |
|
625
|
|
|
this.fmt.validBitsPerSample = 0; |
|
626
|
|
|
this.fact.chunkId = ""; |
|
627
|
|
|
this.fact.chunkSize = 0; |
|
628
|
|
|
this.fact.dwSampleLength = 0; |
|
629
|
|
|
} |
|
630
|
|
|
|
|
631
|
|
|
/** |
|
632
|
|
|
* Make the file 16-bit if it is not. |
|
633
|
|
|
* @private |
|
634
|
|
|
*/ |
|
635
|
|
|
assure16Bit_() { |
|
636
|
|
|
this.assureUncompressed_(); |
|
637
|
|
|
if (this.bitDepth != "16") { |
|
638
|
|
|
this.toBitDepth("16"); |
|
639
|
|
|
} |
|
640
|
|
|
} |
|
641
|
|
|
|
|
642
|
|
|
/** |
|
643
|
|
|
* Uncompress the samples in case of a compressed file. |
|
644
|
|
|
* @private |
|
645
|
|
|
*/ |
|
646
|
|
|
assureUncompressed_() { |
|
647
|
|
|
if (this.bitDepth == "8a") { |
|
648
|
|
|
this.fromALaw(); |
|
649
|
|
|
} else if(this.bitDepth == "8m") { |
|
650
|
|
|
this.fromMuLaw(); |
|
651
|
|
|
} else if (this.bitDepth == "4") { |
|
652
|
|
|
this.fromIMAADPCM(); |
|
653
|
|
|
} |
|
654
|
|
|
} |
|
655
|
|
|
|
|
656
|
|
|
/** |
|
657
|
|
|
* Interleave the samples in case they are de-Interleaved. |
|
658
|
|
|
* @private |
|
659
|
|
|
*/ |
|
660
|
|
|
assureInterleaved_() { |
|
661
|
|
|
if (!this.isInterleaved) { |
|
662
|
|
|
this.interleave(); |
|
663
|
|
|
} |
|
664
|
|
|
} |
|
665
|
|
|
|
|
666
|
|
|
/** |
|
667
|
|
|
* Read the RIFF chunk a wave file. |
|
668
|
|
|
* @param {!Uint8Array|!Array<number>} bytes A wav buffer. |
|
669
|
|
|
* @throws {Error} If no "RIFF" chunk is found. |
|
670
|
|
|
* @private |
|
671
|
|
|
*/ |
|
672
|
|
|
readRIFFChunk_(bytes) { |
|
673
|
|
|
this.container = byteData_.unpackArray( |
|
674
|
|
|
bytes.slice(0, 4), byteData_.chr); |
|
675
|
|
|
if (this.container != "RIFF" && this.container != "RIFX") { |
|
676
|
|
|
throw Error("Not a supported format."); |
|
677
|
|
|
} |
|
678
|
|
|
this.LEorBE_(); |
|
679
|
|
|
this.chunkSize = byteData_.unpack(bytes.slice(4, 8), uInt32_); |
|
680
|
|
|
this.format = byteData_.unpackArray( |
|
681
|
|
|
bytes.slice(8, 12), byteData_.chr); |
|
682
|
|
|
if (this.format != "WAVE") { |
|
683
|
|
|
throw Error("Could not find the 'WAVE' format identifier"); |
|
684
|
|
|
} |
|
685
|
|
|
} |
|
686
|
|
|
|
|
687
|
|
|
/** |
|
688
|
|
|
* Set up to work wih big-endian or little-endian files. |
|
689
|
|
|
* The types used are changed from LE or BE. If the |
|
690
|
|
|
* the file is big-endian (RIFX), true is returned. |
|
691
|
|
|
* @private |
|
692
|
|
|
*/ |
|
693
|
|
|
LEorBE_() { |
|
694
|
|
|
let bigEndian = this.container == "RIFX"; |
|
695
|
|
|
uInt8_.be = bigEndian; |
|
696
|
|
|
uInt16_.be = bigEndian; |
|
697
|
|
|
uInt32_.be = bigEndian; |
|
698
|
|
|
return bigEndian; |
|
699
|
|
|
} |
|
700
|
|
|
|
|
701
|
|
|
/** |
|
702
|
|
|
* Read the "fmt " chunk of a wave file. |
|
703
|
|
|
* @param {!Object<string, *>} chunks The wav file chunks. |
|
704
|
|
|
* @throws {Error} If no "fmt " chunk is found. |
|
705
|
|
|
* @private |
|
706
|
|
|
*/ |
|
707
|
|
|
readFmtChunk_(chunks) { |
|
708
|
|
|
let chunk = this.findChunk_(chunks, "fmt "); |
|
709
|
|
|
if (chunk) { |
|
710
|
|
|
this.fmt.chunkId = "fmt "; |
|
711
|
|
|
this.fmt.chunkSize = chunk["chunkSize"]; |
|
712
|
|
|
this.fmt.audioFormat = byteData_.unpack( |
|
713
|
|
|
chunk["chunkData"].slice(0, 2), uInt16_); |
|
714
|
|
|
this.fmt.numChannels = byteData_.unpack( |
|
715
|
|
|
chunk["chunkData"].slice(2, 4), uInt16_); |
|
716
|
|
|
this.fmt.sampleRate = byteData_.unpack( |
|
717
|
|
|
chunk["chunkData"].slice(4, 8), uInt32_); |
|
718
|
|
|
this.fmt.byteRate = byteData_.unpack( |
|
719
|
|
|
chunk["chunkData"].slice(8, 12), uInt32_); |
|
720
|
|
|
this.fmt.blockAlign = byteData_.unpack( |
|
721
|
|
|
chunk["chunkData"].slice(12, 14), uInt16_); |
|
722
|
|
|
this.fmt.bitsPerSample = byteData_.unpack( |
|
723
|
|
|
chunk["chunkData"].slice(14, 16), uInt16_); |
|
724
|
|
|
this.readFmtExtension_(chunk); |
|
725
|
|
|
} else { |
|
726
|
|
|
throw Error("Could not find the 'fmt ' chunk"); |
|
727
|
|
|
} |
|
728
|
|
|
} |
|
729
|
|
|
|
|
730
|
|
|
/** |
|
731
|
|
|
* Read the "fmt " chunk extension. |
|
732
|
|
|
* @param {!Object<string, *>} chunk The "fmt " chunk. |
|
733
|
|
|
* @private |
|
734
|
|
|
*/ |
|
735
|
|
|
readFmtExtension_(chunk) { |
|
736
|
|
|
let chunkData = chunk["chunkData"]; |
|
737
|
|
|
if (this.fmt.chunkSize > 16) { |
|
738
|
|
|
this.fmt.cbSize = byteData_.unpack( |
|
739
|
|
|
chunkData.slice(16, 18), uInt16_); |
|
740
|
|
|
if (this.fmt.chunkSize > 18) { |
|
741
|
|
|
this.fmt.validBitsPerSample = byteData_.unpack( |
|
742
|
|
|
chunkData.slice(18, 20), uInt16_); |
|
743
|
|
|
if (this.fmt.chunkSize > 20) { |
|
744
|
|
|
this.fmt.dwChannelMask = byteData_.unpack( |
|
745
|
|
|
chunkData.slice(20, 24), uInt32_); |
|
746
|
|
|
this.fmt.subformat = [ |
|
747
|
|
|
byteData_.unpack( |
|
748
|
|
|
chunkData.slice(24, 28), uInt32_), |
|
749
|
|
|
byteData_.unpack( |
|
750
|
|
|
chunkData.slice(28, 32), uInt32_), |
|
751
|
|
|
byteData_.unpack( |
|
752
|
|
|
chunkData.slice(32, 36), uInt32_), |
|
753
|
|
|
byteData_.unpack( |
|
754
|
|
|
chunkData.slice(36, 40), uInt32_)]; |
|
755
|
|
|
} |
|
756
|
|
|
} |
|
757
|
|
|
} |
|
758
|
|
|
} |
|
759
|
|
|
|
|
760
|
|
|
/** |
|
761
|
|
|
* Read the "fact" chunk of a wav file. |
|
762
|
|
|
* @param {!Object<string, *>} chunks The wav file chunks. |
|
763
|
|
|
* @throws {Error} If no "fact" chunk is found. |
|
764
|
|
|
* @private |
|
765
|
|
|
*/ |
|
766
|
|
|
readFactChunk_(chunks) { |
|
767
|
|
|
let chunk = this.findChunk_(chunks, "fact"); |
|
768
|
|
|
if (chunk) { |
|
769
|
|
|
this.fact.chunkId = "fact"; |
|
770
|
|
|
this.fact.chunkSize = chunk["chunkSize"]; |
|
771
|
|
|
this.fact.dwSampleLength = byteData_.unpack( |
|
772
|
|
|
chunk["chunkData"].slice(0, 4), uInt32_); |
|
773
|
|
|
} else if (this.enforceFact_) { |
|
774
|
|
|
throw Error("Could not find the 'fact' chunk"); |
|
775
|
|
|
} |
|
776
|
|
|
} |
|
777
|
|
|
|
|
778
|
|
|
/** |
|
779
|
|
|
* Read the "bext" chunk of a wav file. |
|
780
|
|
|
* @param {!Object<string, *>} chunks The wav file chunks. |
|
781
|
|
|
* @private |
|
782
|
|
|
*/ |
|
783
|
|
|
readBextChunk_(chunks) { |
|
784
|
|
|
let chunk = this.findChunk_(chunks, "bext"); |
|
785
|
|
|
if (chunk) { |
|
786
|
|
|
let chunkData = chunk["chunkData"]; |
|
787
|
|
|
this.head_ = 0; |
|
788
|
|
|
this.bext = { |
|
789
|
|
|
"chunkId": "bext", |
|
790
|
|
|
"chunkSize": chunkData.length, |
|
791
|
|
|
"description": this.readString_(chunkData, 256), |
|
792
|
|
|
"originator": this.readString_(chunkData, 32), |
|
793
|
|
|
"originatorReference": this.readString_(chunkData, 32), |
|
794
|
|
|
"originationDate": this.readString_(chunkData, 10), |
|
795
|
|
|
"originationTime": this.readString_(chunkData, 8), |
|
796
|
|
|
"timeReference": [ |
|
797
|
|
|
this.readFromChunk_(chunkData, uInt32_), |
|
798
|
|
|
this.readFromChunk_(chunkData, uInt32_)], |
|
799
|
|
|
"version": this.readFromChunk_( |
|
800
|
|
|
chunkData, uInt16_), |
|
801
|
|
|
"UMID": this.readString_(chunkData, 64), |
|
802
|
|
|
"loudnessValue": this.readFromChunk_( |
|
803
|
|
|
chunkData, uInt16_), |
|
804
|
|
|
"loudnessRange": this.readFromChunk_( |
|
805
|
|
|
chunkData, uInt16_), |
|
806
|
|
|
"maxTruePeakLevel": this.readFromChunk_( |
|
807
|
|
|
chunkData, uInt16_), |
|
808
|
|
|
"maxMomentaryLoudness": this.readFromChunk_( |
|
809
|
|
|
chunkData, uInt16_), |
|
810
|
|
|
"maxShortTermLoudness": this.readFromChunk_( |
|
811
|
|
|
chunkData, uInt16_), |
|
812
|
|
|
"reserved": this.readString_(chunkData, 180), |
|
813
|
|
|
"codingHistory": this.readString_( |
|
814
|
|
|
chunkData, chunkData.length - 602), |
|
815
|
|
|
}; |
|
816
|
|
|
} |
|
817
|
|
|
} |
|
818
|
|
|
|
|
819
|
|
|
/** |
|
820
|
|
|
* Read bytes as a string from a RIFF chunk. |
|
821
|
|
|
* @param {!Array<number>|!Uint8Array} bytes The bytes. |
|
822
|
|
|
* @param {!number} maxSize the max size of the string. |
|
823
|
|
|
* @private |
|
824
|
|
|
*/ |
|
825
|
|
|
readString_(bytes, maxSize) { |
|
826
|
|
|
let str = ""; |
|
827
|
|
|
for (let i=0; i<maxSize; i++) { |
|
828
|
|
|
str += byteData_.unpack([bytes[this.head_]], byteData_.chr); |
|
829
|
|
|
this.head_++; |
|
830
|
|
|
} |
|
831
|
|
|
return str; |
|
832
|
|
|
} |
|
833
|
|
|
|
|
834
|
|
|
/** |
|
835
|
|
|
* Read a number from a chunk. |
|
836
|
|
|
* @param {!Array<number>|!Uint8Array} bytes The chunk bytes. |
|
837
|
|
|
* @param {!Object<string, *>} bdType The byte-data corresponding type. |
|
838
|
|
|
* @private |
|
839
|
|
|
*/ |
|
840
|
|
|
readFromChunk_(bytes, bdType) { |
|
841
|
|
|
let size = bdType.bits / 8; |
|
842
|
|
|
let value = byteData_.unpack( |
|
843
|
|
|
bytes.slice(this.head_, this.head_ + size), bdType); |
|
844
|
|
|
this.head_ += size; |
|
845
|
|
|
return value; |
|
846
|
|
|
} |
|
847
|
|
|
|
|
848
|
|
|
/** |
|
849
|
|
|
* Write a variable size string as bytes. |
|
850
|
|
|
* If the string is smaller than the max size it |
|
851
|
|
|
* is filled with 0s. |
|
852
|
|
|
* @param {!string} str The string to be written as bytes. |
|
853
|
|
|
* @param {!number} maxSize the max size of the string. |
|
854
|
|
|
* @private |
|
855
|
|
|
*/ |
|
856
|
|
|
writeString_(str, maxSize) { |
|
857
|
|
|
let bytes = byteData_.packArray(str, byteData_.chr); |
|
858
|
|
|
for (let i=bytes.length; i<maxSize; i++) { |
|
859
|
|
|
bytes.push(0); |
|
860
|
|
|
} |
|
861
|
|
|
return bytes; |
|
862
|
|
|
} |
|
863
|
|
|
|
|
864
|
|
|
/** |
|
865
|
|
|
* Read the "cue " chunk of a wave file. |
|
866
|
|
|
* @param {!Object<string, *>} chunks The RIFF file chunks. |
|
867
|
|
|
* @private |
|
868
|
|
|
*/ |
|
869
|
|
|
readCueChunk_(chunks) { |
|
870
|
|
|
let chunk = this.findChunk_(chunks, "cue "); |
|
871
|
|
|
if (chunk) { |
|
872
|
|
|
this.cue.chunkId = "cue "; |
|
873
|
|
|
this.cue.chunkSize = chunk["chunkSize"]; |
|
874
|
|
|
this.cue.chunkData_ = chunk["chunkData"]; |
|
875
|
|
|
} |
|
876
|
|
|
} |
|
877
|
|
|
|
|
878
|
|
|
/** |
|
879
|
|
|
* Read the "data" chunk of a wave file. |
|
880
|
|
|
* @param {!Object<string, *>} chunks The RIFF file chunks. |
|
881
|
|
|
* @param {!Object<string, *>} options Type options. |
|
882
|
|
|
* @throws {Error} If no "data" chunk is found. |
|
883
|
|
|
* @private |
|
884
|
|
|
*/ |
|
885
|
|
|
readDataChunk_(chunks, options) { |
|
886
|
|
|
let chunk = this.findChunk_(chunks, "data"); |
|
887
|
|
|
if (chunk) { |
|
888
|
|
|
this.data.chunkId = "data"; |
|
889
|
|
|
this.data.chunkSize = chunk["chunkSize"]; |
|
890
|
|
|
this.samplesFromBytes_(chunk["chunkData"], options); |
|
891
|
|
|
} else { |
|
892
|
|
|
throw Error("Could not find the 'data' chunk"); |
|
893
|
|
|
} |
|
894
|
|
|
} |
|
895
|
|
|
|
|
896
|
|
|
/** |
|
897
|
|
|
* Find and return the start offset of the data chunk on a wave file. |
|
898
|
|
|
* @param {!Array<number>|!Uint8Array} bytes A wav file buffer. |
|
899
|
|
|
* @param {!Object<string, *>} options Type options. |
|
900
|
|
|
* @private |
|
901
|
|
|
*/ |
|
902
|
|
|
samplesFromBytes_(bytes, options) { |
|
903
|
|
|
options.bits = this.fmt.bitsPerSample == 4 ? |
|
904
|
|
|
8 : this.fmt.bitsPerSample; |
|
905
|
|
|
options.signed = options.bits == 8 ? false : true; |
|
906
|
|
|
options.float = (this.fmt.audioFormat == 3 || |
|
907
|
|
|
this.fmt.bitsPerSample == 64) ? true : false; |
|
908
|
|
|
options.single = false; |
|
909
|
|
|
this.data.samples = byteData_.unpackArray( |
|
910
|
|
|
bytes, new byteData_.Type(options)); |
|
911
|
|
|
} |
|
912
|
|
|
|
|
913
|
|
|
/** |
|
914
|
|
|
* Find a chunk by its FourCC in a array of RIFF chunks. |
|
915
|
|
|
* @param {!Object<string, Object>} chunks The wav file chunks. |
|
916
|
|
|
* @param {!string} fourCC The chunk fourCC. |
|
917
|
|
|
* @return {Object|null} |
|
918
|
|
|
* @private |
|
919
|
|
|
*/ |
|
920
|
|
|
findChunk_(chunks, fourCC) { |
|
921
|
|
|
for (let i = 0; i<chunks.length; i++) { |
|
922
|
|
|
if (chunks[i]["chunkId"] == fourCC) { |
|
923
|
|
|
return chunks[i]; |
|
924
|
|
|
} |
|
925
|
|
|
} |
|
926
|
|
|
return null; |
|
927
|
|
|
} |
|
928
|
|
|
|
|
929
|
|
|
/** |
|
930
|
|
|
* Turn samples to bytes. |
|
931
|
|
|
* @param {!Object<string, *>} options Type options. |
|
932
|
|
|
* @private |
|
933
|
|
|
*/ |
|
934
|
|
|
samplesToBytes_(options) { |
|
935
|
|
|
options.bits = this.fmt.bitsPerSample == 4 ? |
|
936
|
|
|
8 : this.fmt.bitsPerSample; |
|
937
|
|
|
options.signed = options.bits == 8 ? false : true; |
|
938
|
|
|
options.float = (this.fmt.audioFormat == 3 || |
|
939
|
|
|
this.fmt.bitsPerSample == 64) ? true : false; |
|
940
|
|
|
let bytes = byteData_.packArray( |
|
941
|
|
|
this.data.samples, new byteData_.Type(options)); |
|
942
|
|
|
if (bytes.length % 2) { |
|
943
|
|
|
bytes.push(0); |
|
944
|
|
|
} |
|
945
|
|
|
return bytes; |
|
946
|
|
|
} |
|
947
|
|
|
|
|
948
|
|
|
/** |
|
949
|
|
|
* Get the bytes of the "bext" chunk. |
|
950
|
|
|
* @return {!Array<number>} The "bext" chunk bytes. |
|
951
|
|
|
* @private |
|
952
|
|
|
*/ |
|
953
|
|
|
getBextBytes_() { |
|
954
|
|
|
if (this.bext.chunkId) { |
|
955
|
|
|
return [].concat( |
|
956
|
|
|
byteData_.packArray(this.bext.chunkId, byteData_.chr), |
|
957
|
|
|
byteData_.pack(this.bext.chunkSize, uInt32_), |
|
958
|
|
|
this.writeString_(this.bext.description, 256), |
|
959
|
|
|
this.writeString_(this.bext.originator, 32), |
|
960
|
|
|
this.writeString_(this.bext.originatorReference, 32), |
|
961
|
|
|
this.writeString_(this.bext.originationDate, 10), |
|
962
|
|
|
this.writeString_(this.bext.originationTime, 8), |
|
963
|
|
|
byteData_.pack(this.bext.timeReference[0], uInt32_), |
|
964
|
|
|
byteData_.pack(this.bext.timeReference[1], uInt32_), |
|
965
|
|
|
byteData_.pack(this.bext.version, uInt16_), |
|
966
|
|
|
this.writeString_(this.bext.UMID, 64), |
|
967
|
|
|
byteData_.pack(this.bext.loudnessValue, uInt16_), |
|
968
|
|
|
byteData_.pack(this.bext.loudnessRange, uInt16_), |
|
969
|
|
|
byteData_.pack(this.bext.maxTruePeakLevel, uInt16_), |
|
970
|
|
|
byteData_.pack(this.bext.maxMomentaryLoudness, uInt16_), |
|
971
|
|
|
byteData_.pack(this.bext.maxShortTermLoudness, uInt16_), |
|
972
|
|
|
this.writeString_(this.bext.reserved, 180), |
|
973
|
|
|
this.writeString_( |
|
974
|
|
|
this.bext.codingHistory, |
|
975
|
|
|
this.bext.chunkSize - 602)); |
|
976
|
|
|
} |
|
977
|
|
|
return []; |
|
978
|
|
|
} |
|
979
|
|
|
|
|
980
|
|
|
/** |
|
981
|
|
|
* Get the bytes of the "cue " chunk. |
|
982
|
|
|
* @return {!Array<number>} The "cue " chunk bytes. |
|
983
|
|
|
* @private |
|
984
|
|
|
*/ |
|
985
|
|
|
getCueBytes_() { |
|
986
|
|
|
if (this.cue.chunkId) { |
|
987
|
|
|
return [].concat( |
|
988
|
|
|
byteData_.packArray(this.cue.chunkId, byteData_.chr), |
|
989
|
|
|
byteData_.pack(this.cue.chunkSize, uInt32_), |
|
990
|
|
|
this.cue.chunkData_); |
|
991
|
|
|
} |
|
992
|
|
|
return []; |
|
993
|
|
|
} |
|
994
|
|
|
|
|
995
|
|
|
/** |
|
996
|
|
|
* Get the bytes of the "fact" chunk. |
|
997
|
|
|
* @return {!Array<number>} The "fact" chunk bytes. |
|
998
|
|
|
* @private |
|
999
|
|
|
*/ |
|
1000
|
|
|
getFactBytes_() { |
|
1001
|
|
|
if (this.fact.chunkId) { |
|
1002
|
|
|
return [].concat( |
|
1003
|
|
|
byteData_.packArray(this.fact.chunkId, byteData_.chr), |
|
1004
|
|
|
byteData_.pack(this.fact.chunkSize, uInt32_), |
|
1005
|
|
|
byteData_.pack(this.fact.dwSampleLength, uInt32_)); |
|
1006
|
|
|
} |
|
1007
|
|
|
return []; |
|
1008
|
|
|
} |
|
1009
|
|
|
|
|
1010
|
|
|
/** |
|
1011
|
|
|
* Get the bytes of the fmt extension fields. |
|
1012
|
|
|
* @return {!Array<number>} The fmt extension bytes. |
|
1013
|
|
|
* @private |
|
1014
|
|
|
*/ |
|
1015
|
|
|
getFmtExtensionBytes_() { |
|
1016
|
|
|
let extension = []; |
|
1017
|
|
|
if (this.fmt.chunkSize > 16) { |
|
1018
|
|
|
extension = extension.concat( |
|
1019
|
|
|
byteData_.pack(this.fmt.cbSize, uInt16_)); |
|
1020
|
|
|
} |
|
1021
|
|
|
if (this.fmt.chunkSize > 18) { |
|
1022
|
|
|
extension = extension.concat( |
|
1023
|
|
|
byteData_.pack(this.fmt.validBitsPerSample, uInt16_)); |
|
1024
|
|
|
} |
|
1025
|
|
|
if (this.fmt.chunkSize > 20) { |
|
1026
|
|
|
extension = extension.concat( |
|
1027
|
|
|
byteData_.pack(this.fmt.dwChannelMask, uInt32_)); |
|
1028
|
|
|
} |
|
1029
|
|
|
if (this.fmt.chunkSize > 24) { |
|
1030
|
|
|
extension = extension.concat( |
|
1031
|
|
|
byteData_.pack(this.fmt.subformat[0], uInt32_), |
|
1032
|
|
|
byteData_.pack(this.fmt.subformat[1], uInt32_), |
|
1033
|
|
|
byteData_.pack(this.fmt.subformat[2], uInt32_), |
|
1034
|
|
|
byteData_.pack(this.fmt.subformat[3], uInt32_)); |
|
1035
|
|
|
} |
|
1036
|
|
|
return extension; |
|
1037
|
|
|
} |
|
1038
|
|
|
|
|
1039
|
|
|
/** |
|
1040
|
|
|
* Turn a WaveFile object into a file. |
|
1041
|
|
|
* @return {!Array<number>} The wav file bytes. |
|
1042
|
|
|
* @private |
|
1043
|
|
|
*/ |
|
1044
|
|
|
createWaveFile_() { |
|
1045
|
|
|
let options = {"be": this.LEorBE_()}; |
|
1046
|
|
|
return [].concat( |
|
1047
|
|
|
byteData_.packArray(this.container, byteData_.chr), |
|
1048
|
|
|
byteData_.pack(this.chunkSize, uInt32_), |
|
1049
|
|
|
byteData_.packArray(this.format, byteData_.chr), |
|
1050
|
|
|
this.getBextBytes_(), |
|
1051
|
|
|
byteData_.packArray(this.fmt.chunkId, byteData_.chr), |
|
1052
|
|
|
byteData_.pack(this.fmt.chunkSize, uInt32_), |
|
1053
|
|
|
byteData_.pack(this.fmt.audioFormat, uInt16_), |
|
1054
|
|
|
byteData_.pack(this.fmt.numChannels, uInt16_), |
|
1055
|
|
|
byteData_.pack(this.fmt.sampleRate, uInt32_), |
|
1056
|
|
|
byteData_.pack(this.fmt.byteRate, uInt32_), |
|
1057
|
|
|
byteData_.pack(this.fmt.blockAlign, uInt16_), |
|
1058
|
|
|
byteData_.pack(this.fmt.bitsPerSample, uInt16_), |
|
1059
|
|
|
this.getFmtExtensionBytes_(), |
|
1060
|
|
|
this.getFactBytes_(), |
|
1061
|
|
|
byteData_.packArray(this.data.chunkId, byteData_.chr), |
|
1062
|
|
|
byteData_.pack(this.data.chunkSize, uInt32_), |
|
1063
|
|
|
this.samplesToBytes_(options), |
|
1064
|
|
|
this.getCueBytes_()); |
|
1065
|
|
|
} |
|
1066
|
|
|
} |
|
1067
|
|
|
|
|
1068
|
|
|
module.exports = WaveFile; |
|
1069
|
|
|
|
rochars /
wavefile
