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/* |
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* Copyright (c) 2017-2018 Rafael da Silva Rocha. MIT License. |
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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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const encodeBase64_ = require("base64-arraybuffer").encode; |
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/** @private */ |
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const decodeBase64_ = require("base64-arraybuffer").decode; |
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/** @private */ |
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const uInt16_ = {"bits": 16}; |
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/** @private */ |
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const uInt32_ = {"bits": 32}; |
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/** @private */ |
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const fourCC_ = {"bits": 32, "char": true}; |
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/** @private */ |
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const chr_ = {"bits": 8, "char": true}; |
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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} 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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* @export |
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*/ |
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this.container = ""; |
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/** |
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* @type {number} |
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* @export |
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*/ |
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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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* @export |
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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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* @export |
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*/ |
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this.fmt = { |
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/** @export @type {string} */ |
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"chunkId": "", |
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/** @export @type {number} */ |
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"chunkSize": 0, |
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/** @export @type {number} */ |
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"audioFormat": 0, |
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/** @export @type {number} */ |
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"numChannels": 0, |
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/** @export @type {number} */ |
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"sampleRate": 0, |
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/** @export @type {number} */ |
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"byteRate": 0, |
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/** @export @type {number} */ |
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"blockAlign": 0, |
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/** @export @type {number} */ |
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"bitsPerSample": 0, |
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/** @export @type {number} */ |
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"cbSize": 0, |
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/** @export @type {number} */ |
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"validBitsPerSample": 0, |
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/** @export @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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* @export @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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* @export |
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*/ |
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this.fact = { |
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/** @export @type {string} */ |
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"chunkId": "", |
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/** @export @type {number} */ |
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"chunkSize": 0, |
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/** @export @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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* @export |
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*/ |
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this.cue = { |
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/** @export @type {string} */ |
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"chunkId": "", |
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/** @export @type {number} */ |
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"chunkSize": 0, |
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/** @export @type {number} */ |
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"dwCuePoints": 0, |
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/** @export @type {!Array<!Object>} */ |
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"points": [], |
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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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* @export |
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*/ |
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this.bext = { |
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/** @export @type {string} */ |
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"chunkId": "", |
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/** @export @type {number} */ |
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"chunkSize": 0, |
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/** @export @type {string} */ |
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"description": "", //256 |
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/** @export @type {string} */ |
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"originator": "", //32 |
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/** @export @type {string} */ |
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"originatorReference": "", //32 |
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/** @export @type {string} */ |
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"originationDate": "", //10 |
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/** @export @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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* @export @type {!Array<number>} |
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*/ |
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"timeReference": [], |
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/** @export @type {number} */ |
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"version": 0, //WORD |
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/** @export @type {string} */ |
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"UMID": "", // 64 chars |
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/** @export @type {number} */ |
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"loudnessValue": 0, //WORD |
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/** @export @type {number} */ |
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"loudnessRange": 0, //WORD |
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/** @export @type {number} */ |
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"maxTruePeakLevel": 0, //WORD |
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/** @export @type {number} */ |
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"maxMomentaryLoudness": 0, //WORD |
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/** @export @type {number} */ |
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"maxShortTermLoudness": 0, //WORD |
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/** @export @type {string} */ |
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"reserved": "", //180 |
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/** @export @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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* @export |
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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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/** @export @type {number} */ |
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"chunkSize": 0, |
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/** @export @type {number} */ |
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"riffSizeHigh": 0, // DWORD |
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/** @export @type {number} */ |
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"riffSizeLow": 0, // DWORD |
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/** @export @type {number} */ |
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"dataSizeHigh": 0, // DWORD |
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/** @export @type {number} */ |
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"dataSizeLow": 0, // DWORD |
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/** @export @type {number} */ |
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"originationTime": 0, // DWORD |
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/** @export @type {number} */ |
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"sampleCountHigh": 0, // DWORD |
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/** @export @type {number} */ |
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"sampleCountLow": 0, // DWORD |
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/** @export @type {number} */ |
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//"tableLength": 0, // DWORD |
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/** @export @type {!Array<number>} */ |
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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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* @export |
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*/ |
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this.data = { |
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/** @export @type {string} */ |
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"chunkId": "", |
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/** @export @type {number} */ |
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"chunkSize": 0, |
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/** @export @type {!Array<number>} */ |
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"samples": [] |
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}; |
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/** |
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* The data of the "LIST" chunks. |
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* Each item in this list must have this signature: |
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* { |
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* "chunkId": "", |
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* "chunkSize": 0, |
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* "format": "", |
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* "subChunks": [] |
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* } |
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* @type {!Array<!Object>} |
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* @export |
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*/ |
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this.LIST = []; |
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/** |
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* The data of the "junk" chunk. |
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* @type {!Object<string, *>} |
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* @export |
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*/ |
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this.junk = { |
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/** @export @type {string} */ |
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"chunkId": "", |
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/** @export @type {number} */ |
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"chunkSize": 0, |
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/** @export @type {!Array<number>} */ |
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"chunkData": [] |
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}; |
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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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* @export |
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*/ |
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this.isInterleaved = true; |
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/** |
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* @type {string} |
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* @export |
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*/ |
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this.bitDepth = "0"; |
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/** |
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* Audio formats. |
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* Formats not listed here will be set to 65534 |
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* and treated as WAVE_FORMAT_EXTENSIBLE |
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* @enum {number} |
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* @private |
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*/ |
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255
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this.audioFormats_ = { |
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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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// Load a file from the buffer if one was passed |
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// when creating the object |
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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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285
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* Integer numbers like 8000, 44100, 48000, 96000, 192000. |
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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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292
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* @param {Object} options Optional. Used to force the container |
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293
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* as RIFX with {"container": "RIFX"} |
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* @throws {Error} If any argument does not meet the criteria. |
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295
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* @export |
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296
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*/ |
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297
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fromScratch(numChannels, sampleRate, bitDepth, samples, options={}) { |
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298
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if (!options["container"]) { |
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options["container"] = "RIFF"; |
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} |
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301
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this.bitDepth = bitDepth; |
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// interleave the samples if they were passed de-interleaved |
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this.data.samples = samples; |
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if (samples.length > 0) { |
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if (samples[0].constructor === Array) { |
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this.isInterleaved = false; |
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this.assureInterleaved_(); |
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308
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} |
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309
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} |
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310
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/** type {number} */ |
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311
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let numBytes = (((parseInt(bitDepth, 10) - 1) | 7) + 1) / 8; |
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312
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// Normal PCM file header |
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313
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if (["8","16","24","32","32f","64"].indexOf(bitDepth) > -1) { |
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314
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this.createPCMHeader_( |
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315
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bitDepth, numChannels, sampleRate, numBytes, options); |
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316
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// IMA ADPCM header |
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317
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} else if (bitDepth == "4") { |
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318
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this.createADPCMHeader_( |
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319
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bitDepth, numChannels, sampleRate, numBytes, options); |
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320
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// A-Law and mu-Law header |
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321
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} else if (bitDepth == "8a" || bitDepth == "8m") { |
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322
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this.createALawMulawHeader_( |
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323
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bitDepth, numChannels, sampleRate, numBytes, options); |
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324
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// WAVE_FORMAT_EXTENSIBLE |
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325
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} else { |
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326
|
|
|
this.createExtensibleHeader_( |
|
327
|
|
|
bitDepth, numChannels, sampleRate, numBytes, options); |
|
328
|
|
|
} |
|
329
|
|
|
// the data chunk |
|
330
|
|
|
this.data.chunkId = "data"; |
|
331
|
|
|
this.data.chunkSize = this.data.samples.length * numBytes; |
|
332
|
|
|
this.validateHeader_(); |
|
333
|
|
|
this.LEorBE_(); |
|
334
|
|
|
} |
|
335
|
|
|
|
|
336
|
|
|
/** |
|
337
|
|
|
* Init a WaveFile object from a byte buffer. |
|
338
|
|
|
* @param {!Uint8Array} 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
|
|
|
* @export |
|
344
|
|
|
*/ |
|
345
|
|
|
fromBuffer(bytes) { |
|
346
|
|
|
this.clearHeader_(); |
|
347
|
|
|
this.readRIFFChunk_(bytes); |
|
348
|
|
|
/** @type {!Object} */ |
|
349
|
|
|
let chunk = riffChunks_.read(bytes); |
|
350
|
|
|
this.readDs64Chunk_(chunk["subChunks"]); |
|
351
|
|
|
this.readFmtChunk_(chunk["subChunks"]); |
|
352
|
|
|
this.readFactChunk_(chunk["subChunks"]); |
|
353
|
|
|
this.readBextChunk_(chunk["subChunks"]); |
|
354
|
|
|
this.readCueChunk_(chunk["subChunks"]); |
|
355
|
|
|
this.readDataChunk_(chunk["subChunks"]); |
|
356
|
|
|
this.readLISTChunk_(chunk["subChunks"]); |
|
357
|
|
|
this.readJunkChunk_(chunk["subChunks"]); |
|
358
|
|
|
this.bitDepthFromFmt_(); |
|
359
|
|
|
} |
|
360
|
|
|
|
|
361
|
|
|
/** |
|
362
|
|
|
* Return a byte buffer representig the WaveFile object as a .wav file. |
|
363
|
|
|
* The return value of this method can be written straight to disk. |
|
364
|
|
|
* @return {!Uint8Array} A .wav file. |
|
365
|
|
|
* @throws {Error} If any property of the object appears invalid. |
|
366
|
|
|
* @export |
|
367
|
|
|
*/ |
|
368
|
|
|
toBuffer() { |
|
369
|
|
|
this.validateHeader_(); |
|
370
|
|
|
this.assureInterleaved_(); |
|
371
|
|
|
return this.createWaveFile_(); |
|
372
|
|
|
} |
|
373
|
|
|
|
|
374
|
|
|
/** |
|
375
|
|
|
* Use a .wav file encoded as a base64 string to load the WaveFile object. |
|
376
|
|
|
* @param {string} base64String A .wav file as a base64 string. |
|
377
|
|
|
* @throws {Error} If any property of the object appears invalid. |
|
378
|
|
|
* @export |
|
379
|
|
|
*/ |
|
380
|
|
|
fromBase64(base64String) { |
|
381
|
|
|
this.fromBuffer(new Uint8Array(decodeBase64_(base64String))); |
|
382
|
|
|
} |
|
383
|
|
|
|
|
384
|
|
|
/** |
|
385
|
|
|
* Return a base64 string representig the WaveFile object as a .wav file. |
|
386
|
|
|
* @return {string} A .wav file as a base64 string. |
|
387
|
|
|
* @throws {Error} If any property of the object appears invalid. |
|
388
|
|
|
* @export |
|
389
|
|
|
*/ |
|
390
|
|
|
toBase64() { |
|
391
|
|
|
return encodeBase64_(this.toBuffer()); |
|
392
|
|
|
} |
|
393
|
|
|
|
|
394
|
|
|
/** |
|
395
|
|
|
* Return a DataURI string representig the WaveFile object as a .wav file. |
|
396
|
|
|
* The return of this method can be used to load the audio in browsers. |
|
397
|
|
|
* @return {string} A .wav file as a DataURI. |
|
398
|
|
|
* @throws {Error} If any property of the object appears invalid. |
|
399
|
|
|
* @export |
|
400
|
|
|
*/ |
|
401
|
|
|
toDataURI() { |
|
402
|
|
|
return "data:audio/wav;base64," + this.toBase64(); |
|
403
|
|
|
} |
|
404
|
|
|
|
|
405
|
|
|
/** |
|
406
|
|
|
* Use a .wav file encoded as a DataURI to load the WaveFile object. |
|
407
|
|
|
* @param {string} dataURI A .wav file as DataURI. |
|
408
|
|
|
* @throws {Error} If any property of the object appears invalid. |
|
409
|
|
|
* @export |
|
410
|
|
|
*/ |
|
411
|
|
|
fromDataURI(dataURI) { |
|
412
|
|
|
this.fromBase64(dataURI.replace("data:audio/wav;base64,", "")); |
|
413
|
|
|
} |
|
414
|
|
|
|
|
415
|
|
|
/** |
|
416
|
|
|
* Force a file as RIFF. |
|
417
|
|
|
* @export |
|
418
|
|
|
*/ |
|
419
|
|
|
toRIFF() { |
|
420
|
|
|
if (this.container == "RF64") { |
|
421
|
|
|
this.fromScratch( |
|
422
|
|
|
this.fmt.numChannels, |
|
423
|
|
|
this.fmt.sampleRate, |
|
424
|
|
|
this.bitDepth, |
|
425
|
|
|
this.data.samples); |
|
426
|
|
|
} else { |
|
427
|
|
|
this.container = "RIFF"; |
|
428
|
|
|
this.LEorBE_(); |
|
429
|
|
|
} |
|
430
|
|
|
} |
|
431
|
|
|
|
|
432
|
|
|
/** |
|
433
|
|
|
* Force a file as RIFX. |
|
434
|
|
|
* @export |
|
435
|
|
|
*/ |
|
436
|
|
|
toRIFX() { |
|
437
|
|
|
if (this.container == "RF64") { |
|
438
|
|
|
this.fromScratch( |
|
439
|
|
|
this.fmt.numChannels, |
|
440
|
|
|
this.fmt.sampleRate, |
|
441
|
|
|
this.bitDepth, |
|
442
|
|
|
this.data.samples, |
|
443
|
|
|
{"container": "RIFX"}); |
|
444
|
|
|
} else { |
|
445
|
|
|
this.container = "RIFX"; |
|
446
|
|
|
this.LEorBE_(); |
|
447
|
|
|
} |
|
448
|
|
|
} |
|
449
|
|
|
|
|
450
|
|
|
/** |
|
451
|
|
|
* Change the bit depth of the samples. |
|
452
|
|
|
* @param {string} bitDepth The new bit depth of the samples. |
|
453
|
|
|
* One of "8" ... "32" (integers), "32f" or "64" (floats) |
|
454
|
|
|
* @param {boolean} changeResolution A boolean indicating if the |
|
455
|
|
|
* resolution of samples should be actually changed or not. |
|
456
|
|
|
* @throws {Error} If the bit depth is not valid. |
|
457
|
|
|
* @export |
|
458
|
|
|
*/ |
|
459
|
|
|
toBitDepth(bitDepth, changeResolution=true) { |
|
460
|
|
|
let toBitDepth = bitDepth; |
|
461
|
|
|
let thisBitDepth = this.bitDepth; |
|
462
|
|
|
if (!changeResolution) { |
|
463
|
|
|
toBitDepth = this.realBitDepth_(bitDepth); |
|
464
|
|
|
thisBitDepth = this.realBitDepth_(this.bitDepth); |
|
465
|
|
|
} |
|
466
|
|
|
this.assureInterleaved_(); |
|
467
|
|
|
this.assureUncompressed_(); |
|
468
|
|
|
bitDepth_.toBitDepth(this.data.samples, thisBitDepth, toBitDepth); |
|
469
|
|
|
this.fromScratch( |
|
470
|
|
|
this.fmt.numChannels, |
|
471
|
|
|
this.fmt.sampleRate, |
|
472
|
|
|
bitDepth, |
|
473
|
|
|
this.data.samples, |
|
474
|
|
|
{"container": this.correctContainer_()}); |
|
475
|
|
|
} |
|
476
|
|
|
|
|
477
|
|
|
/** |
|
478
|
|
|
* Interleave multi-channel samples. |
|
479
|
|
|
* @export |
|
480
|
|
|
*/ |
|
481
|
|
|
interleave() { |
|
482
|
|
|
if (!this.isInterleaved) { |
|
483
|
|
|
/** @type {!Array<number>} */ |
|
484
|
|
|
let finalSamples = []; |
|
485
|
|
|
for (let i=0; i < this.data.samples[0].length; i++) { |
|
486
|
|
|
for (let j=0; j < this.data.samples.length; j++) { |
|
487
|
|
|
finalSamples.push(this.data.samples[j][i]); |
|
488
|
|
|
} |
|
489
|
|
|
} |
|
490
|
|
|
this.data.samples = finalSamples; |
|
491
|
|
|
this.isInterleaved = true; |
|
492
|
|
|
} |
|
493
|
|
|
} |
|
494
|
|
|
|
|
495
|
|
|
/** |
|
496
|
|
|
* De-interleave samples into multiple channels. |
|
497
|
|
|
* @export |
|
498
|
|
|
*/ |
|
499
|
|
|
deInterleave() { |
|
500
|
|
|
if (this.isInterleaved) { |
|
501
|
|
|
/** @type {!Array<!Array<number>>} */ |
|
502
|
|
|
let finalSamples = []; |
|
503
|
|
|
for (let i=0; i < this.fmt.numChannels; i++) { |
|
504
|
|
|
finalSamples[i] = []; |
|
505
|
|
|
} |
|
506
|
|
|
for (let i=0; i < this.data.samples.length; i++) { |
|
507
|
|
|
for (let j=0; j < this.fmt.numChannels; j++) { |
|
508
|
|
|
finalSamples[j].push(this.data.samples[i+j]); |
|
509
|
|
|
} |
|
510
|
|
|
i += this.fmt.numChannels - 1; |
|
|
|
|
|
|
511
|
|
|
} |
|
512
|
|
|
this.data.samples = finalSamples; |
|
513
|
|
|
this.isInterleaved = false; |
|
514
|
|
|
} |
|
515
|
|
|
} |
|
516
|
|
|
|
|
517
|
|
|
/** |
|
518
|
|
|
* Encode a 16-bit wave file as 4-bit IMA ADPCM. |
|
519
|
|
|
* @throws {Error} If sample rate is not 8000. |
|
520
|
|
|
* @throws {Error} If number of channels is not 1. |
|
521
|
|
|
* @export |
|
522
|
|
|
*/ |
|
523
|
|
|
toIMAADPCM() { |
|
524
|
|
|
if (this.fmt.sampleRate != 8000) { |
|
525
|
|
|
throw new Error( |
|
526
|
|
|
"Only 8000 Hz files can be compressed as IMA-ADPCM."); |
|
527
|
|
|
} else if(this.fmt.numChannels != 1) { |
|
|
|
|
|
|
528
|
|
|
throw new Error( |
|
529
|
|
|
"Only mono files can be compressed as IMA-ADPCM."); |
|
530
|
|
|
} else { |
|
531
|
|
|
this.assure16Bit_(); |
|
532
|
|
|
this.fromScratch( |
|
533
|
|
|
this.fmt.numChannels, |
|
534
|
|
|
this.fmt.sampleRate, |
|
535
|
|
|
"4", |
|
536
|
|
|
imaadpcm_.encode(this.data.samples), |
|
537
|
|
|
{"container": this.correctContainer_()}); |
|
538
|
|
|
} |
|
539
|
|
|
} |
|
540
|
|
|
|
|
541
|
|
|
/** |
|
542
|
|
|
* Decode a 4-bit IMA ADPCM wave file as a 16-bit wave file. |
|
543
|
|
|
* @param {string} bitDepth The new bit depth of the samples. |
|
544
|
|
|
* One of "8" ... "32" (integers), "32f" or "64" (floats). |
|
545
|
|
|
* Optional. Default is 16. |
|
546
|
|
|
* @export |
|
547
|
|
|
*/ |
|
548
|
|
|
fromIMAADPCM(bitDepth="16") { |
|
549
|
|
|
this.fromScratch( |
|
550
|
|
|
this.fmt.numChannels, |
|
551
|
|
|
this.fmt.sampleRate, |
|
552
|
|
|
"16", |
|
553
|
|
|
imaadpcm_.decode(this.data.samples, this.fmt.blockAlign), |
|
554
|
|
|
{"container": this.correctContainer_()}); |
|
555
|
|
|
if (bitDepth != "16") { |
|
556
|
|
|
this.toBitDepth(bitDepth); |
|
557
|
|
|
} |
|
558
|
|
|
} |
|
559
|
|
|
|
|
560
|
|
|
/** |
|
561
|
|
|
* Encode 16-bit wave file as 8-bit A-Law. |
|
562
|
|
|
* @export |
|
563
|
|
|
*/ |
|
564
|
|
|
toALaw() { |
|
565
|
|
|
this.assure16Bit_(); |
|
566
|
|
|
this.assureInterleaved_(); |
|
567
|
|
|
this.fromScratch( |
|
568
|
|
|
this.fmt.numChannels, |
|
569
|
|
|
this.fmt.sampleRate, |
|
570
|
|
|
"8a", |
|
571
|
|
|
alawmulaw_.alaw.encode(this.data.samples), |
|
572
|
|
|
{"container": this.correctContainer_()}); |
|
573
|
|
|
} |
|
574
|
|
|
|
|
575
|
|
|
/** |
|
576
|
|
|
* Decode a 8-bit A-Law wave file into a 16-bit wave file. |
|
577
|
|
|
* @param {string} bitDepth The new bit depth of the samples. |
|
578
|
|
|
* One of "8" ... "32" (integers), "32f" or "64" (floats). |
|
579
|
|
|
* Optional. Default is 16. |
|
580
|
|
|
* @export |
|
581
|
|
|
*/ |
|
582
|
|
|
fromALaw(bitDepth="16") { |
|
583
|
|
|
this.fromScratch( |
|
584
|
|
|
this.fmt.numChannels, |
|
585
|
|
|
this.fmt.sampleRate, |
|
586
|
|
|
"16", |
|
587
|
|
|
alawmulaw_.alaw.decode(this.data.samples), |
|
588
|
|
|
{"container": this.correctContainer_()}); |
|
589
|
|
|
if (bitDepth != "16") { |
|
590
|
|
|
this.toBitDepth(bitDepth); |
|
591
|
|
|
} |
|
592
|
|
|
} |
|
593
|
|
|
|
|
594
|
|
|
/** |
|
595
|
|
|
* Encode 16-bit wave file as 8-bit mu-Law. |
|
596
|
|
|
* @export |
|
597
|
|
|
*/ |
|
598
|
|
|
toMuLaw() { |
|
599
|
|
|
this.assure16Bit_(); |
|
600
|
|
|
this.assureInterleaved_(); |
|
601
|
|
|
this.fromScratch( |
|
602
|
|
|
this.fmt.numChannels, |
|
603
|
|
|
this.fmt.sampleRate, |
|
604
|
|
|
"8m", |
|
605
|
|
|
alawmulaw_.mulaw.encode(this.data.samples), |
|
606
|
|
|
{"container": this.correctContainer_()}); |
|
607
|
|
|
} |
|
608
|
|
|
|
|
609
|
|
|
/** |
|
610
|
|
|
* Decode a 8-bit mu-Law wave file into a 16-bit wave file. |
|
611
|
|
|
* @param {string} bitDepth The new bit depth of the samples. |
|
612
|
|
|
* One of "8" ... "32" (integers), "32f" or "64" (floats). |
|
613
|
|
|
* Optional. Default is 16. |
|
614
|
|
|
* @export |
|
615
|
|
|
*/ |
|
616
|
|
|
fromMuLaw(bitDepth="16") { |
|
617
|
|
|
this.fromScratch( |
|
618
|
|
|
this.fmt.numChannels, |
|
619
|
|
|
this.fmt.sampleRate, |
|
620
|
|
|
"16", |
|
621
|
|
|
alawmulaw_.mulaw.decode(this.data.samples), |
|
622
|
|
|
{"container": this.correctContainer_()}); |
|
623
|
|
|
if (bitDepth != "16") { |
|
624
|
|
|
this.toBitDepth(bitDepth); |
|
625
|
|
|
} |
|
626
|
|
|
} |
|
627
|
|
|
|
|
628
|
|
|
/** |
|
629
|
|
|
* Write a RIFF tag in the INFO chunk. If the tag do not exist, |
|
630
|
|
|
* then it is created. It if exists, it is overwritten. |
|
631
|
|
|
* @param {string} tag The tag name. |
|
632
|
|
|
* @param {string} value The tag value. |
|
633
|
|
|
* @throws {Error} If the tag name is not valid. |
|
634
|
|
|
* @export |
|
635
|
|
|
*/ |
|
636
|
|
|
setTag(tag, value) { |
|
637
|
|
|
tag = this.fixTagName_(tag); |
|
638
|
|
|
/** @type {!Object} */ |
|
639
|
|
|
let index = this.getTagIndex_(tag); |
|
640
|
|
|
if (index.TAG !== null) { |
|
641
|
|
|
this.LIST[index.LIST]["subChunks"][index.TAG]["chunkSize"] = |
|
642
|
|
|
value.length + 1; |
|
643
|
|
|
this.LIST[index.LIST]["subChunks"][index.TAG]["value"] = value; |
|
644
|
|
|
} else if (index.LIST !== null) { |
|
645
|
|
|
this.LIST[index.LIST]["subChunks"].push({ |
|
646
|
|
|
"chunkId": tag, |
|
647
|
|
|
"chunkSize": value.length + 1, |
|
648
|
|
|
"value": value}); |
|
649
|
|
|
} else { |
|
650
|
|
|
this.LIST.push({ |
|
651
|
|
|
"chunkId": "LIST", |
|
652
|
|
|
"chunkSize": 8 + value.length + 1, |
|
653
|
|
|
"format": "INFO", |
|
654
|
|
|
"chunkData": [], |
|
655
|
|
|
"subChunks": []}); |
|
656
|
|
|
this.LIST[this.LIST.length - 1]["subChunks"].push({ |
|
657
|
|
|
"chunkId": tag, |
|
658
|
|
|
"chunkSize": value.length + 1, |
|
659
|
|
|
"value": value}); |
|
660
|
|
|
} |
|
661
|
|
|
} |
|
662
|
|
|
|
|
663
|
|
|
/** |
|
664
|
|
|
* Return the value of a RIFF tag in the INFO chunk. |
|
665
|
|
|
* @param {string} tag The tag name. |
|
666
|
|
|
* @return {string|null} The value if the tag is found, null otherwise. |
|
667
|
|
|
* @export |
|
668
|
|
|
*/ |
|
669
|
|
|
getTag(tag) { |
|
670
|
|
|
/** @type {!Object} */ |
|
671
|
|
|
let index = this.getTagIndex_(tag); |
|
672
|
|
|
if (index.TAG !== null) { |
|
673
|
|
|
return this.LIST[index.LIST]["subChunks"][index.TAG]["value"]; |
|
674
|
|
|
} |
|
675
|
|
|
return null; |
|
676
|
|
|
} |
|
677
|
|
|
|
|
678
|
|
|
/** |
|
679
|
|
|
* Remove a RIFF tag in the INFO chunk. |
|
680
|
|
|
* @param {string} tag The tag name. |
|
681
|
|
|
* @return {boolean} True if a tag was deleted. |
|
682
|
|
|
* @export |
|
683
|
|
|
*/ |
|
684
|
|
|
deleteTag(tag) { |
|
685
|
|
|
/** @type {!Object} */ |
|
686
|
|
|
let index = this.getTagIndex_(tag); |
|
687
|
|
|
if (index.TAG !== null) { |
|
688
|
|
|
this.LIST[index.LIST]["subChunks"].splice(index.TAG, 1); |
|
689
|
|
|
return true; |
|
690
|
|
|
} |
|
691
|
|
|
return false; |
|
692
|
|
|
} |
|
693
|
|
|
|
|
694
|
|
|
/** |
|
695
|
|
|
* Create a cue point in the wave file. |
|
696
|
|
|
* @param {number} position The cue point position in milliseconds. |
|
697
|
|
|
* @param {string} labl The LIST adtl labl text of the marker. Optional. |
|
698
|
|
|
* @export |
|
699
|
|
|
*/ |
|
700
|
|
|
setCuePoint(position, labl="") { |
|
701
|
|
|
this.cue.chunkId = "cue "; |
|
702
|
|
|
position = (position * this.fmt.sampleRate) / 1000; |
|
703
|
|
|
/** @type {!Array<Object>} */ |
|
704
|
|
|
let existingPoints = this.getCuePoints_(); |
|
705
|
|
|
this.clearLISTadtl_(); |
|
706
|
|
|
/** @type {number} */ |
|
707
|
|
|
let len = this.cue.points.length; |
|
708
|
|
|
this.cue.points = []; |
|
709
|
|
|
let hasSet = false; |
|
710
|
|
|
if (len == 0) { |
|
|
|
|
|
|
711
|
|
|
this.setCuePoint_(position, 1, labl); |
|
712
|
|
|
} else { |
|
713
|
|
|
for (let i=0; i<len; i++) { |
|
714
|
|
|
if (existingPoints[i]["dwPosition"] > position && !hasSet) { |
|
715
|
|
|
this.setCuePoint_(position, i + 1, labl); |
|
716
|
|
|
this.setCuePoint_( |
|
717
|
|
|
existingPoints[i]["dwPosition"], |
|
718
|
|
|
i + 2, |
|
719
|
|
|
existingPoints[i]["label"]); |
|
720
|
|
|
hasSet = true; |
|
721
|
|
|
} else { |
|
722
|
|
|
this.setCuePoint_( |
|
723
|
|
|
existingPoints[i]["dwPosition"], |
|
724
|
|
|
i + 1, |
|
725
|
|
|
existingPoints[i]["label"]); |
|
726
|
|
|
} |
|
727
|
|
|
} |
|
728
|
|
|
if (!hasSet) { |
|
729
|
|
|
this.setCuePoint_(position, this.cue.points.length + 1, labl); |
|
730
|
|
|
} |
|
731
|
|
|
} |
|
732
|
|
|
this.cue.dwCuePoints = this.cue.points.length; |
|
733
|
|
|
} |
|
734
|
|
|
|
|
735
|
|
|
/** |
|
736
|
|
|
* Remove a cue point from a wave file. |
|
737
|
|
|
* @param {number} index the index of the point. First is 1, |
|
738
|
|
|
* second is 2, and so on. |
|
739
|
|
|
* @export |
|
740
|
|
|
*/ |
|
741
|
|
|
deleteCuePoint(index) { |
|
742
|
|
|
this.cue.chunkId = "cue "; |
|
743
|
|
|
/** @type {!Array<Object>} */ |
|
744
|
|
|
let existingPoints = this.getCuePoints_(); |
|
745
|
|
|
this.clearLISTadtl_(); |
|
746
|
|
|
let len = this.cue.points.length; |
|
747
|
|
|
this.cue.points = []; |
|
748
|
|
|
for (let i=0; i<len; i++) { |
|
749
|
|
|
if (i + 1 != index) { |
|
750
|
|
|
this.setCuePoint_( |
|
751
|
|
|
existingPoints[i]["dwPosition"], |
|
752
|
|
|
i + 1, |
|
753
|
|
|
existingPoints[i]["label"]); |
|
754
|
|
|
} |
|
755
|
|
|
} |
|
756
|
|
|
this.cue.dwCuePoints = this.cue.points.length; |
|
757
|
|
|
if (this.cue.dwCuePoints) { |
|
758
|
|
|
this.cue.chunkId = 'cue '; |
|
759
|
|
|
} else { |
|
760
|
|
|
this.cue.chunkId = ''; |
|
761
|
|
|
this.clearLISTadtl_(); |
|
762
|
|
|
} |
|
763
|
|
|
} |
|
764
|
|
|
|
|
765
|
|
|
/** |
|
766
|
|
|
* Update the label of a cue point. |
|
767
|
|
|
* @param {number} pointIndex The ID of the cue point. |
|
768
|
|
|
* @param {string} label The new text for the label. |
|
769
|
|
|
* @export |
|
770
|
|
|
*/ |
|
771
|
|
|
updateLabel(pointIndex, label) { |
|
772
|
|
|
/** @type {number|null} */ |
|
773
|
|
|
let adtlIndex = this.getAdtlChunk_(); |
|
774
|
|
|
if (adtlIndex !== null) { |
|
775
|
|
|
for (let i=0; i<this.LIST[adtlIndex]["subChunks"].length; i++) { |
|
776
|
|
|
if (this.LIST[adtlIndex]["subChunks"][i]["dwName"] == |
|
777
|
|
|
pointIndex) { |
|
778
|
|
|
this.LIST[adtlIndex]["subChunks"][i]["value"] = label; |
|
779
|
|
|
} |
|
780
|
|
|
} |
|
781
|
|
|
} |
|
782
|
|
|
} |
|
783
|
|
|
|
|
784
|
|
|
/** |
|
785
|
|
|
* Push a new cue point in this.cue.points. |
|
786
|
|
|
* @param {number} position The position in milliseconds. |
|
787
|
|
|
* @param {number} dwName the dwName of the cue point |
|
788
|
|
|
* @private |
|
789
|
|
|
*/ |
|
790
|
|
|
setCuePoint_(position, dwName, label) { |
|
791
|
|
|
this.cue.points.push({ |
|
792
|
|
|
"dwName": dwName, |
|
793
|
|
|
"dwPosition": position, |
|
794
|
|
|
"fccChunk": "data", |
|
795
|
|
|
"dwChunkStart": 0, |
|
796
|
|
|
"dwBlockStart": 0, |
|
797
|
|
|
"dwSampleOffset": position, |
|
798
|
|
|
}); |
|
799
|
|
|
this.setLabl_(dwName, label); |
|
800
|
|
|
} |
|
801
|
|
|
|
|
802
|
|
|
/** |
|
803
|
|
|
* Return an array with the position of all cue points in the file. |
|
804
|
|
|
* @return {!Array<!Object>} |
|
805
|
|
|
* @private |
|
806
|
|
|
*/ |
|
807
|
|
|
getCuePoints_() { |
|
808
|
|
|
/** @type {!Array<Object>} */ |
|
809
|
|
|
let points = []; |
|
810
|
|
|
for (let i=0; i<this.cue.points.length; i++) { |
|
811
|
|
|
points.push({ |
|
812
|
|
|
'dwPosition': this.cue.points[i]["dwPosition"], |
|
813
|
|
|
'label': this.getLabelForCuePoint_( |
|
814
|
|
|
this.cue.points[i]["dwName"])}); |
|
815
|
|
|
} |
|
816
|
|
|
return points; |
|
817
|
|
|
} |
|
818
|
|
|
|
|
819
|
|
|
/** |
|
820
|
|
|
* Return the label of a cue point. |
|
821
|
|
|
* @param {number} pointDwName The ID of the cue point. |
|
822
|
|
|
* @return {string} |
|
823
|
|
|
* @private |
|
824
|
|
|
*/ |
|
825
|
|
|
getLabelForCuePoint_(pointDwName) { |
|
826
|
|
|
/** @type {number|null} */ |
|
827
|
|
|
let adtlIndex = this.getAdtlChunk_(); |
|
828
|
|
|
if (adtlIndex !== null) { |
|
829
|
|
|
for (let i=0; i<this.LIST[adtlIndex]["subChunks"].length; i++) { |
|
830
|
|
|
if (this.LIST[adtlIndex]["subChunks"][i]["dwName"] == |
|
831
|
|
|
pointDwName) { |
|
832
|
|
|
return this.LIST[adtlIndex]["subChunks"][i]["value"]; |
|
833
|
|
|
} |
|
834
|
|
|
} |
|
835
|
|
|
} |
|
836
|
|
|
return ""; |
|
837
|
|
|
} |
|
838
|
|
|
|
|
839
|
|
|
/** |
|
840
|
|
|
* Clear any LIST chunk labeled as "adtl". |
|
841
|
|
|
* @private |
|
842
|
|
|
*/ |
|
843
|
|
|
clearLISTadtl_() { |
|
844
|
|
|
for (let i=0; i<this.LIST.length; i++) { |
|
845
|
|
|
if (this.LIST[i]["format"] == 'adtl') { |
|
846
|
|
|
this.LIST.splice(i); |
|
847
|
|
|
} |
|
848
|
|
|
} |
|
849
|
|
|
} |
|
850
|
|
|
|
|
851
|
|
|
/** |
|
852
|
|
|
* Create a new "labl" subchunk in a "LIST" chunk of type "adtl". |
|
853
|
|
|
* @param {number} dwName The ID of the cue point. |
|
854
|
|
|
* @param {string} label The label for the cue point. |
|
855
|
|
|
* @private |
|
856
|
|
|
*/ |
|
857
|
|
|
setLabl_(dwName, label) { |
|
858
|
|
|
/** @type {number|null} */ |
|
859
|
|
|
let adtlIndex = this.getAdtlChunk_(); |
|
860
|
|
|
if (adtlIndex === null) { |
|
861
|
|
|
this.LIST.push({ |
|
862
|
|
|
"chunkId": "LIST", |
|
863
|
|
|
"chunkSize": 4, |
|
864
|
|
|
"format": "adtl", |
|
865
|
|
|
"chunkData": [], |
|
866
|
|
|
"subChunks": []}); |
|
867
|
|
|
adtlIndex = this.LIST.length - 1; |
|
868
|
|
|
} |
|
869
|
|
|
this.setLabelText_(adtlIndex === null ? 0 : adtlIndex, dwName, label); |
|
870
|
|
|
} |
|
871
|
|
|
|
|
872
|
|
|
/** |
|
873
|
|
|
* Create a new "labl" subchunk in a "LIST" chunk of type "adtl". |
|
874
|
|
|
* @param {number} adtlIndex The index of the "adtl" LIST in this.LIST. |
|
875
|
|
|
* @param {number} dwName The ID of the cue point. |
|
876
|
|
|
* @param {string} label The label for the cue point. |
|
877
|
|
|
* @private |
|
878
|
|
|
*/ |
|
879
|
|
|
setLabelText_(adtlIndex, dwName, label) { |
|
880
|
|
|
this.LIST[adtlIndex]["subChunks"].push({ |
|
881
|
|
|
"chunkId": "labl", |
|
882
|
|
|
"chunkSize": label.length, |
|
883
|
|
|
"dwName": dwName, |
|
884
|
|
|
"value": label |
|
885
|
|
|
}); |
|
886
|
|
|
this.LIST[adtlIndex]["chunkSize"] += label.length + 4 + 4 + 4 + 1; |
|
887
|
|
|
} |
|
888
|
|
|
|
|
889
|
|
|
/** |
|
890
|
|
|
* Return the index of the "adtl" LIST in this.LIST. |
|
891
|
|
|
* @return {number|null} |
|
892
|
|
|
* @private |
|
893
|
|
|
*/ |
|
894
|
|
|
getAdtlChunk_() { |
|
895
|
|
|
for (let i=0; i<this.LIST.length; i++) { |
|
896
|
|
|
if(this.LIST[i]["format"] == 'adtl') { |
|
897
|
|
|
return i; |
|
898
|
|
|
} |
|
899
|
|
|
} |
|
900
|
|
|
return null; |
|
901
|
|
|
} |
|
902
|
|
|
|
|
903
|
|
|
/** |
|
904
|
|
|
* Return the index of a tag in a FILE chunk. |
|
905
|
|
|
* @param {string} tag The tag name. |
|
906
|
|
|
* @return {!Object<string, number|null>} |
|
907
|
|
|
* Object.LIST is the INFO index in LIST |
|
908
|
|
|
* Object.TAG is the tag index in the INFO |
|
909
|
|
|
* @private |
|
910
|
|
|
*/ |
|
911
|
|
|
getTagIndex_(tag) { |
|
912
|
|
|
/** @type {!Object} */ |
|
913
|
|
|
let index = {LIST: null, TAG: null}; |
|
914
|
|
|
for (let i=0; i<this.LIST.length; i++) { |
|
915
|
|
|
if (this.LIST[i]["format"] == "INFO") { |
|
916
|
|
|
index.LIST = i; |
|
917
|
|
|
for (let j=0; j<this.LIST[i]["subChunks"].length; j++) { |
|
918
|
|
|
if (this.LIST[i]["subChunks"][j]["chunkId"] == tag) { |
|
919
|
|
|
index.TAG = j; |
|
920
|
|
|
break; |
|
921
|
|
|
} |
|
922
|
|
|
} |
|
923
|
|
|
break; |
|
924
|
|
|
} |
|
925
|
|
|
} |
|
926
|
|
|
return index; |
|
927
|
|
|
} |
|
928
|
|
|
|
|
929
|
|
|
/** |
|
930
|
|
|
* Fix a RIFF tag format if possible, throw an error otherwise. |
|
931
|
|
|
* @param {string} tag The tag name. |
|
932
|
|
|
* @return {string} The tag name in proper fourCC format. |
|
933
|
|
|
* @private |
|
934
|
|
|
*/ |
|
935
|
|
|
fixTagName_(tag) { |
|
936
|
|
|
if (tag.constructor !== String) { |
|
937
|
|
|
throw new Error("Invalid tag name."); |
|
938
|
|
|
} else if(tag.length < 4) { |
|
939
|
|
|
for (let i=0; i<4-tag.length; i++) { |
|
940
|
|
|
tag += ' '; |
|
941
|
|
|
} |
|
942
|
|
|
} |
|
943
|
|
|
return tag; |
|
944
|
|
|
} |
|
945
|
|
|
|
|
946
|
|
|
/** |
|
947
|
|
|
* Create the header of a ADPCM wave file. |
|
948
|
|
|
* @param {string} bitDepth The audio bit depth |
|
949
|
|
|
* @param {number} numChannels The number of channels |
|
950
|
|
|
* @param {number} sampleRate The sample rate. |
|
951
|
|
|
* @param {number} numBytes The number of bytes each sample use. |
|
952
|
|
|
* @param {!Object} options The extra options, like container defintion. |
|
953
|
|
|
* @private |
|
954
|
|
|
*/ |
|
955
|
|
|
createADPCMHeader_(bitDepth, numChannels, sampleRate, numBytes, options) { |
|
956
|
|
|
this.createPCMHeader_( |
|
957
|
|
|
bitDepth, numChannels, sampleRate, numBytes, options); |
|
958
|
|
|
this.chunkSize = 40 + this.data.samples.length; |
|
959
|
|
|
this.fmt.chunkSize = 20; |
|
960
|
|
|
this.fmt.byteRate = 4055; |
|
961
|
|
|
this.fmt.blockAlign = 256; |
|
962
|
|
|
this.fmt.bitsPerSample = 4; |
|
963
|
|
|
this.fmt.cbSize = 2; |
|
964
|
|
|
this.fmt.validBitsPerSample = 505; |
|
965
|
|
|
this.fact.chunkId = "fact"; |
|
966
|
|
|
this.fact.chunkSize = 4; |
|
967
|
|
|
this.fact.dwSampleLength = this.data.samples.length * 2; |
|
968
|
|
|
this.data.chunkSize = this.data.samples.length; |
|
969
|
|
|
} |
|
970
|
|
|
|
|
971
|
|
|
/** |
|
972
|
|
|
* Create the header of WAVE_FORMAT_EXTENSIBLE file. |
|
973
|
|
|
* @param {string} bitDepth The audio bit depth |
|
974
|
|
|
* @param {number} numChannels The number of channels |
|
975
|
|
|
* @param {number} sampleRate The sample rate. |
|
976
|
|
|
* @param {number} numBytes The number of bytes each sample use. |
|
977
|
|
|
* @param {!Object} options The extra options, like container defintion. |
|
978
|
|
|
* @private |
|
979
|
|
|
*/ |
|
980
|
|
|
createExtensibleHeader_( |
|
981
|
|
|
bitDepth, numChannels, sampleRate, numBytes, options) { |
|
982
|
|
|
this.createPCMHeader_( |
|
983
|
|
|
bitDepth, numChannels, sampleRate, numBytes, options); |
|
984
|
|
|
this.chunkSize = 36 + 24 + this.data.samples.length * numBytes; |
|
985
|
|
|
this.fmt.chunkSize = 40; |
|
986
|
|
|
this.fmt.bitsPerSample = ((parseInt(bitDepth, 10) - 1) | 7) + 1; |
|
987
|
|
|
this.fmt.cbSize = 22; |
|
988
|
|
|
this.fmt.validBitsPerSample = parseInt(bitDepth, 10); |
|
989
|
|
|
this.fmt.dwChannelMask = 0; |
|
990
|
|
|
// subformat 128-bit GUID as 4 32-bit values |
|
991
|
|
|
// only supports uncompressed integer PCM samples |
|
992
|
|
|
this.fmt.subformat = [1, 1048576, 2852126848, 1905997824]; |
|
993
|
|
|
} |
|
994
|
|
|
|
|
995
|
|
|
/** |
|
996
|
|
|
* Create the header of mu-Law and A-Law wave files. |
|
997
|
|
|
* @param {string} bitDepth The audio bit depth |
|
998
|
|
|
* @param {number} numChannels The number of channels |
|
999
|
|
|
* @param {number} sampleRate The sample rate. |
|
1000
|
|
|
* @param {number} numBytes The number of bytes each sample use. |
|
1001
|
|
|
* @param {!Object} options The extra options, like container defintion. |
|
1002
|
|
|
* @private |
|
1003
|
|
|
*/ |
|
1004
|
|
|
createALawMulawHeader_( |
|
1005
|
|
|
bitDepth, numChannels, sampleRate, numBytes, options) { |
|
1006
|
|
|
this.createPCMHeader_( |
|
1007
|
|
|
bitDepth, numChannels, sampleRate, numBytes, options); |
|
1008
|
|
|
this.chunkSize = 40 + this.data.samples.length; |
|
1009
|
|
|
this.fmt.chunkSize = 20; |
|
1010
|
|
|
this.fmt.cbSize = 2; |
|
1011
|
|
|
this.fmt.validBitsPerSample = 8; |
|
1012
|
|
|
this.fact.chunkId = "fact"; |
|
1013
|
|
|
this.fact.chunkSize = 4; |
|
1014
|
|
|
this.fact.dwSampleLength = this.data.samples.length; |
|
1015
|
|
|
} |
|
1016
|
|
|
|
|
1017
|
|
|
/** |
|
1018
|
|
|
* Create the header of a linear PCM wave file. |
|
1019
|
|
|
* @param {string} bitDepth The audio bit depth |
|
1020
|
|
|
* @param {number} numChannels The number of channels |
|
1021
|
|
|
* @param {number} sampleRate The sample rate. |
|
1022
|
|
|
* @param {number} numBytes The number of bytes each sample use. |
|
1023
|
|
|
* @param {!Object} options The extra options, like container defintion. |
|
1024
|
|
|
* @private |
|
1025
|
|
|
*/ |
|
1026
|
|
|
createPCMHeader_(bitDepth, numChannels, sampleRate, numBytes, options) { |
|
1027
|
|
|
this.clearHeader_(); |
|
1028
|
|
|
this.container = options["container"]; |
|
1029
|
|
|
this.chunkSize = 36 + this.data.samples.length * numBytes; |
|
1030
|
|
|
this.format = "WAVE"; |
|
1031
|
|
|
this.fmt.chunkId = "fmt "; |
|
1032
|
|
|
this.fmt.chunkSize = 16; |
|
1033
|
|
|
this.fmt.byteRate = (numChannels * numBytes) * sampleRate; |
|
1034
|
|
|
this.fmt.blockAlign = numChannels * numBytes; |
|
1035
|
|
|
this.fmt.audioFormat = this.audioFormats_[bitDepth] ? |
|
1036
|
|
|
this.audioFormats_[bitDepth] : 65534; |
|
1037
|
|
|
this.fmt.numChannels = numChannels; |
|
1038
|
|
|
this.fmt.sampleRate = sampleRate; |
|
1039
|
|
|
this.fmt.bitsPerSample = parseInt(bitDepth, 10); |
|
1040
|
|
|
this.fmt.cbSize = 0; |
|
1041
|
|
|
this.fmt.validBitsPerSample = 0; |
|
1042
|
|
|
} |
|
1043
|
|
|
|
|
1044
|
|
|
/** |
|
1045
|
|
|
* Return the closest greater number of bits for a number of bits that |
|
1046
|
|
|
* do not fill a full sequence of bytes. |
|
1047
|
|
|
* @param {string} bitDepth The bit depth. |
|
1048
|
|
|
* @return {string} |
|
1049
|
|
|
* @private |
|
1050
|
|
|
*/ |
|
1051
|
|
|
realBitDepth_(bitDepth) { |
|
1052
|
|
|
if (bitDepth != "32f") { |
|
1053
|
|
|
bitDepth = (((parseInt(bitDepth, 10) - 1) | 7) + 1).toString(); |
|
1054
|
|
|
} |
|
1055
|
|
|
return bitDepth; |
|
1056
|
|
|
} |
|
1057
|
|
|
|
|
1058
|
|
|
/** |
|
1059
|
|
|
* Validate the header of the file. |
|
1060
|
|
|
* @throws {Error} If any property of the object appears invalid. |
|
1061
|
|
|
* @private |
|
1062
|
|
|
*/ |
|
1063
|
|
|
validateHeader_() { |
|
1064
|
|
|
this.validateBitDepth_(); |
|
1065
|
|
|
this.validateNumChannels_(); |
|
1066
|
|
|
this.validateSampleRate_(); |
|
1067
|
|
|
} |
|
1068
|
|
|
|
|
1069
|
|
|
/** |
|
1070
|
|
|
* Validate the bit depth. |
|
1071
|
|
|
* @return {boolean} True is the bit depth is valid. |
|
1072
|
|
|
* @throws {Error} If bit depth is invalid. |
|
1073
|
|
|
* @private |
|
1074
|
|
|
*/ |
|
1075
|
|
|
validateBitDepth_() { |
|
1076
|
|
|
if (!this.audioFormats_[this.bitDepth]) { |
|
1077
|
|
|
if (parseInt(this.bitDepth, 10) > 8 && |
|
1078
|
|
|
parseInt(this.bitDepth, 10) < 54) { |
|
1079
|
|
|
return true; |
|
1080
|
|
|
} |
|
1081
|
|
|
throw new Error("Invalid bit depth."); |
|
1082
|
|
|
} |
|
1083
|
|
|
return true; |
|
1084
|
|
|
} |
|
1085
|
|
|
|
|
1086
|
|
|
/** |
|
1087
|
|
|
* Validate the number of channels. |
|
1088
|
|
|
* @return {boolean} True is the number of channels is valid. |
|
1089
|
|
|
* @throws {Error} If the number of channels is invalid. |
|
1090
|
|
|
* @private |
|
1091
|
|
|
*/ |
|
1092
|
|
|
validateNumChannels_() { |
|
1093
|
|
|
/** @type {number} */ |
|
1094
|
|
|
let blockAlign = this.fmt.numChannels * this.fmt.bitsPerSample / 8; |
|
1095
|
|
|
if (this.fmt.numChannels < 1 || blockAlign > 65535) { |
|
1096
|
|
|
throw new Error("Invalid number of channels."); |
|
1097
|
|
|
} |
|
1098
|
|
|
return true; |
|
1099
|
|
|
} |
|
1100
|
|
|
|
|
1101
|
|
|
/** |
|
1102
|
|
|
* Validate the sample rate value. |
|
1103
|
|
|
* @return {boolean} True is the sample rate is valid. |
|
1104
|
|
|
* @throws {Error} If the sample rate is invalid. |
|
1105
|
|
|
* @private |
|
1106
|
|
|
*/ |
|
1107
|
|
|
validateSampleRate_() { |
|
1108
|
|
|
/** @type {number} */ |
|
1109
|
|
|
let byteRate = this.fmt.numChannels * |
|
1110
|
|
|
(this.fmt.bitsPerSample / 8) * this.fmt.sampleRate; |
|
1111
|
|
|
if (this.fmt.sampleRate < 1 || byteRate > 4294967295) { |
|
1112
|
|
|
throw new Error("Invalid sample rate."); |
|
1113
|
|
|
} |
|
1114
|
|
|
return true; |
|
1115
|
|
|
} |
|
1116
|
|
|
|
|
1117
|
|
|
/** |
|
1118
|
|
|
* Reset attributes that should emptied when a file is |
|
1119
|
|
|
* created with the fromScratch() or fromBuffer() methods. |
|
1120
|
|
|
* @private |
|
1121
|
|
|
*/ |
|
1122
|
|
|
clearHeader_() { |
|
1123
|
|
|
this.fmt.cbSize = 0; |
|
1124
|
|
|
this.fmt.validBitsPerSample = 0; |
|
1125
|
|
|
this.fact.chunkId = ""; |
|
1126
|
|
|
this.ds64.chunkId = ""; |
|
1127
|
|
|
} |
|
1128
|
|
|
|
|
1129
|
|
|
/** |
|
1130
|
|
|
* Make the file 16-bit if it is not. |
|
1131
|
|
|
* @private |
|
1132
|
|
|
*/ |
|
1133
|
|
|
assure16Bit_() { |
|
1134
|
|
|
this.assureUncompressed_(); |
|
1135
|
|
|
if (this.bitDepth != "16") { |
|
1136
|
|
|
this.toBitDepth("16"); |
|
1137
|
|
|
} |
|
1138
|
|
|
} |
|
1139
|
|
|
|
|
1140
|
|
|
/** |
|
1141
|
|
|
* Uncompress the samples in case of a compressed file. |
|
1142
|
|
|
* @private |
|
1143
|
|
|
*/ |
|
1144
|
|
|
assureUncompressed_() { |
|
1145
|
|
|
if (this.bitDepth == "8a") { |
|
1146
|
|
|
this.fromALaw(); |
|
1147
|
|
|
} else if(this.bitDepth == "8m") { |
|
1148
|
|
|
this.fromMuLaw(); |
|
1149
|
|
|
} else if (this.bitDepth == "4") { |
|
1150
|
|
|
this.fromIMAADPCM(); |
|
1151
|
|
|
} |
|
1152
|
|
|
} |
|
1153
|
|
|
|
|
1154
|
|
|
/** |
|
1155
|
|
|
* Interleave the samples in case they are de-Interleaved. |
|
1156
|
|
|
* @private |
|
1157
|
|
|
*/ |
|
1158
|
|
|
assureInterleaved_() { |
|
1159
|
|
|
if (!this.isInterleaved) { |
|
1160
|
|
|
this.interleave(); |
|
1161
|
|
|
} |
|
1162
|
|
|
} |
|
1163
|
|
|
|
|
1164
|
|
|
/** |
|
1165
|
|
|
* Set up to work wih big-endian or little-endian files. |
|
1166
|
|
|
* The types used are changed to LE or BE. If the |
|
1167
|
|
|
* the file is big-endian (RIFX), true is returned. |
|
1168
|
|
|
* @return {boolean} True if the file is RIFX. |
|
1169
|
|
|
* @private |
|
1170
|
|
|
*/ |
|
1171
|
|
|
LEorBE_() { |
|
1172
|
|
|
/** @type {boolean} */ |
|
1173
|
|
|
let bigEndian = this.container === "RIFX"; |
|
1174
|
|
|
uInt16_["be"] = bigEndian; |
|
1175
|
|
|
uInt32_["be"] = bigEndian; |
|
1176
|
|
|
return bigEndian; |
|
1177
|
|
|
} |
|
1178
|
|
|
|
|
1179
|
|
|
/** |
|
1180
|
|
|
* Find a chunk by its fourCC_ in a array of RIFF chunks. |
|
1181
|
|
|
* @param {!Array<!Object>} chunks The wav file chunks. |
|
1182
|
|
|
* @param {string} chunkId The chunk fourCC_. |
|
1183
|
|
|
* @param {boolean} multiple True if there may be multiple chunks |
|
1184
|
|
|
* with the same chunkId. |
|
1185
|
|
|
* @return {Object|Array<!Object>|null} |
|
1186
|
|
|
* @private |
|
1187
|
|
|
*/ |
|
1188
|
|
|
findChunk_(chunks, chunkId, multiple=false) { |
|
1189
|
|
|
/** @type {!Array<!Object>} */ |
|
1190
|
|
|
let chunk = []; |
|
1191
|
|
|
for (let i=0; i<chunks.length; i++) { |
|
1192
|
|
|
if (chunks[i]["chunkId"] == chunkId) { |
|
1193
|
|
|
if (multiple) { |
|
1194
|
|
|
chunk.push(chunks[i]); |
|
1195
|
|
|
} else { |
|
1196
|
|
|
return chunks[i]; |
|
1197
|
|
|
} |
|
1198
|
|
|
} |
|
1199
|
|
|
} |
|
1200
|
|
|
if (chunkId == "LIST") { |
|
1201
|
|
|
return chunk.length ? chunk : null; |
|
1202
|
|
|
} |
|
1203
|
|
|
return null; |
|
1204
|
|
|
} |
|
1205
|
|
|
|
|
1206
|
|
|
/** |
|
1207
|
|
|
* Read the RIFF chunk a wave file. |
|
1208
|
|
|
* @param {!Uint8Array} bytes A wav buffer. |
|
1209
|
|
|
* @throws {Error} If no "RIFF" chunk is found. |
|
1210
|
|
|
* @private |
|
1211
|
|
|
*/ |
|
1212
|
|
|
readRIFFChunk_(bytes) { |
|
1213
|
|
|
this.head_ = 0; |
|
1214
|
|
|
this.container = this.readString_(bytes, 4); |
|
1215
|
|
|
if (["RIFF", "RIFX", "RF64"].indexOf(this.container) === -1) { |
|
1216
|
|
|
throw Error("Not a supported format."); |
|
1217
|
|
|
} |
|
1218
|
|
|
this.LEorBE_(); |
|
1219
|
|
|
this.chunkSize = this.read_(bytes, uInt32_); |
|
1220
|
|
|
this.format = this.readString_(bytes, 4); |
|
1221
|
|
|
if (this.format != "WAVE") { |
|
1222
|
|
|
throw Error("Could not find the 'WAVE' format identifier"); |
|
1223
|
|
|
} |
|
1224
|
|
|
} |
|
1225
|
|
|
|
|
1226
|
|
|
/** |
|
1227
|
|
|
* Read the "fmt " chunk of a wave file. |
|
1228
|
|
|
* @param {!Array<!Object>} chunks The wav file chunks. |
|
1229
|
|
|
* @throws {Error} If no "fmt " chunk is found. |
|
1230
|
|
|
* @private |
|
1231
|
|
|
*/ |
|
1232
|
|
|
readFmtChunk_(chunks) { |
|
1233
|
|
|
/** type {Array<!Object>} */ |
|
1234
|
|
|
let chunk = this.findChunk_(chunks, "fmt "); |
|
1235
|
|
|
if (chunk) { |
|
1236
|
|
|
this.head_ = 0; |
|
1237
|
|
|
let chunkData = chunk["chunkData"]; |
|
1238
|
|
|
this.fmt.chunkId = chunk["chunkId"]; |
|
1239
|
|
|
this.fmt.chunkSize = chunk["chunkSize"]; |
|
1240
|
|
|
this.fmt.audioFormat = this.read_(chunkData, uInt16_); |
|
1241
|
|
|
this.fmt.numChannels = this.read_(chunkData, uInt16_); |
|
1242
|
|
|
this.fmt.sampleRate = this.read_(chunkData, uInt32_); |
|
1243
|
|
|
this.fmt.byteRate = this.read_(chunkData, uInt32_); |
|
1244
|
|
|
this.fmt.blockAlign = this.read_(chunkData, uInt16_); |
|
1245
|
|
|
this.fmt.bitsPerSample = this.read_(chunkData, uInt16_); |
|
1246
|
|
|
this.readFmtExtension_(chunkData); |
|
1247
|
|
|
} else { |
|
1248
|
|
|
throw Error("Could not find the 'fmt ' chunk"); |
|
1249
|
|
|
} |
|
1250
|
|
|
} |
|
1251
|
|
|
|
|
1252
|
|
|
/** |
|
1253
|
|
|
* Read the "fmt " chunk extension. |
|
1254
|
|
|
* @param {!Array<number>} chunkData The "fmt " chunk. |
|
1255
|
|
|
* @private |
|
1256
|
|
|
*/ |
|
1257
|
|
|
readFmtExtension_(chunkData) { |
|
1258
|
|
|
if (this.fmt.chunkSize > 16) { |
|
1259
|
|
|
this.fmt.cbSize = this.read_( |
|
1260
|
|
|
chunkData, uInt16_); |
|
1261
|
|
|
if (this.fmt.chunkSize > 18) { |
|
1262
|
|
|
this.fmt.validBitsPerSample = this.read_(chunkData, uInt16_); |
|
1263
|
|
|
if (this.fmt.chunkSize > 20) { |
|
1264
|
|
|
this.fmt.dwChannelMask = this.read_(chunkData, uInt32_); |
|
1265
|
|
|
this.fmt.subformat = [ |
|
1266
|
|
|
this.read_(chunkData, uInt32_), |
|
1267
|
|
|
this.read_(chunkData, uInt32_), |
|
1268
|
|
|
this.read_(chunkData, uInt32_), |
|
1269
|
|
|
this.read_(chunkData, uInt32_)]; |
|
1270
|
|
|
} |
|
1271
|
|
|
} |
|
1272
|
|
|
} |
|
1273
|
|
|
} |
|
1274
|
|
|
|
|
1275
|
|
|
/** |
|
1276
|
|
|
* Read the "fact" chunk of a wav file. |
|
1277
|
|
|
* @param {!Array<Object>} chunks The wav file chunks. |
|
1278
|
|
|
* @throws {Error} If no "fact" chunk is found. |
|
1279
|
|
|
* @private |
|
1280
|
|
|
*/ |
|
1281
|
|
|
readFactChunk_(chunks) { |
|
1282
|
|
|
/** type {Array<!Object>} */ |
|
1283
|
|
|
let chunk = this.findChunk_(chunks, "fact"); |
|
1284
|
|
|
if (chunk) { |
|
1285
|
|
|
this.head_ = 0; |
|
1286
|
|
|
this.fact.chunkId = chunk["chunkId"]; |
|
1287
|
|
|
this.fact.chunkSize = chunk["chunkSize"]; |
|
1288
|
|
|
this.fact.dwSampleLength = this.read_(chunk["chunkData"], uInt32_); |
|
1289
|
|
|
} |
|
1290
|
|
|
} |
|
1291
|
|
|
|
|
1292
|
|
|
/** |
|
1293
|
|
|
* Read the "cue " chunk of a wave file. |
|
1294
|
|
|
* @param {!Array<Object>} chunks The RIFF file chunks. |
|
1295
|
|
|
* @private |
|
1296
|
|
|
*/ |
|
1297
|
|
|
readCueChunk_(chunks) { |
|
1298
|
|
|
/** type {Array<!Object>} */ |
|
1299
|
|
|
let chunk = this.findChunk_(chunks, "cue "); |
|
1300
|
|
|
if (chunk) { |
|
1301
|
|
|
this.head_ = 0; |
|
1302
|
|
|
let chunkData = chunk["chunkData"]; |
|
1303
|
|
|
this.cue.chunkId = chunk["chunkId"]; |
|
1304
|
|
|
this.cue.chunkSize = chunk["chunkSize"]; |
|
1305
|
|
|
this.cue.dwCuePoints = this.read_(chunkData, uInt32_); |
|
1306
|
|
|
for (let i=0; i<this.cue.dwCuePoints; i++) { |
|
1307
|
|
|
this.cue.points.push({ |
|
1308
|
|
|
"dwName": this.read_(chunkData, uInt32_), |
|
1309
|
|
|
"dwPosition": this.read_(chunkData, uInt32_), |
|
1310
|
|
|
"fccChunk": this.readString_(chunkData, 4), |
|
1311
|
|
|
"dwChunkStart": this.read_(chunkData, uInt32_), |
|
1312
|
|
|
"dwBlockStart": this.read_(chunkData, uInt32_), |
|
1313
|
|
|
"dwSampleOffset": this.read_(chunkData, uInt32_), |
|
1314
|
|
|
}); |
|
1315
|
|
|
} |
|
1316
|
|
|
} |
|
1317
|
|
|
} |
|
1318
|
|
|
|
|
1319
|
|
|
/** |
|
1320
|
|
|
* Read the "data" chunk of a wave file. |
|
1321
|
|
|
* @param {!Array<Object>} chunks The RIFF file chunks. |
|
1322
|
|
|
* @throws {Error} If no "data" chunk is found. |
|
1323
|
|
|
* @private |
|
1324
|
|
|
*/ |
|
1325
|
|
|
readDataChunk_(chunks) { |
|
1326
|
|
|
/** type {Array<!Object>} */ |
|
1327
|
|
|
let chunk = this.findChunk_(chunks, "data"); |
|
1328
|
|
|
if (chunk) { |
|
1329
|
|
|
this.data.chunkId = "data"; |
|
1330
|
|
|
this.data.chunkSize = chunk["chunkSize"]; |
|
1331
|
|
|
this.samplesFromBytes_(chunk["chunkData"]); |
|
1332
|
|
|
} else { |
|
1333
|
|
|
throw Error("Could not find the 'data' chunk"); |
|
1334
|
|
|
} |
|
1335
|
|
|
} |
|
1336
|
|
|
|
|
1337
|
|
|
/** |
|
1338
|
|
|
* Read the "bext" chunk of a wav file. |
|
1339
|
|
|
* @param {!Array<Object>} chunks The wav file chunks. |
|
1340
|
|
|
* @private |
|
1341
|
|
|
*/ |
|
1342
|
|
|
readBextChunk_(chunks) { |
|
1343
|
|
|
/** type {Array<!Object>} */ |
|
1344
|
|
|
let chunk = this.findChunk_(chunks, "bext"); |
|
1345
|
|
|
if (chunk) { |
|
1346
|
|
|
this.head_ = 0; |
|
1347
|
|
|
let chunkData = chunk["chunkData"]; |
|
1348
|
|
|
this.bext.chunkId = chunk["chunkId"]; |
|
1349
|
|
|
this.bext.chunkSize = chunk["chunkSize"]; |
|
1350
|
|
|
this.bext.description = this.readString_(chunkData, 256); |
|
1351
|
|
|
this.bext.originator = this.readString_(chunkData, 32); |
|
1352
|
|
|
this.bext.originatorReference = this.readString_(chunkData, 32); |
|
1353
|
|
|
this.bext.originationDate = this.readString_(chunkData, 10); |
|
1354
|
|
|
this.bext.originationTime = this.readString_(chunkData, 8); |
|
1355
|
|
|
this.bext.timeReference = [ |
|
1356
|
|
|
this.read_(chunkData, uInt32_), |
|
1357
|
|
|
this.read_(chunkData, uInt32_)]; |
|
1358
|
|
|
this.bext.version = this.read_(chunkData, uInt16_); |
|
1359
|
|
|
this.bext.UMID = this.readString_(chunkData, 64); |
|
1360
|
|
|
this.bext.loudnessValue = this.read_(chunkData, uInt16_); |
|
1361
|
|
|
this.bext.loudnessRange = this.read_(chunkData, uInt16_); |
|
1362
|
|
|
this.bext.maxTruePeakLevel = this.read_(chunkData, uInt16_); |
|
1363
|
|
|
this.bext.maxMomentaryLoudness = this.read_(chunkData, uInt16_); |
|
1364
|
|
|
this.bext.maxShortTermLoudness = this.read_(chunkData, uInt16_); |
|
1365
|
|
|
this.bext.reserved = this.readString_(chunkData, 180); |
|
1366
|
|
|
this.bext.codingHistory = this.readString_( |
|
1367
|
|
|
chunkData, this.bext.chunkSize - 602); |
|
1368
|
|
|
} |
|
1369
|
|
|
} |
|
1370
|
|
|
|
|
1371
|
|
|
/** |
|
1372
|
|
|
* Read the "ds64" chunk of a wave file. |
|
1373
|
|
|
* @param {!Array<Object>} chunks The wav file chunks. |
|
1374
|
|
|
* @throws {Error} If no "ds64" chunk is found and the file is RF64. |
|
1375
|
|
|
* @private |
|
1376
|
|
|
*/ |
|
1377
|
|
|
readDs64Chunk_(chunks) { |
|
1378
|
|
|
/** type {Array<!Object>} */ |
|
1379
|
|
|
let chunk = this.findChunk_(chunks, "ds64"); |
|
1380
|
|
|
if (chunk) { |
|
1381
|
|
|
this.head_ = 0; |
|
1382
|
|
|
let chunkData = chunk["chunkData"]; |
|
1383
|
|
|
this.ds64.chunkId = chunk["chunkId"]; |
|
1384
|
|
|
this.ds64.chunkSize = chunk["chunkSize"]; |
|
1385
|
|
|
this.ds64.riffSizeHigh = this.read_(chunkData, uInt32_); |
|
1386
|
|
|
this.ds64.riffSizeLow = this.read_(chunkData, uInt32_); |
|
1387
|
|
|
this.ds64.dataSizeHigh = this.read_(chunkData, uInt32_); |
|
1388
|
|
|
this.ds64.dataSizeLow = this.read_(chunkData, uInt32_); |
|
1389
|
|
|
this.ds64.originationTime = this.read_(chunkData, uInt32_); |
|
1390
|
|
|
this.ds64.sampleCountHigh = this.read_(chunkData, uInt32_); |
|
1391
|
|
|
this.ds64.sampleCountLow = this.read_(chunkData, uInt32_); |
|
1392
|
|
|
//if (this.ds64.chunkSize > 28) { |
|
1393
|
|
|
// this.ds64.tableLength = byteData_.unpack( |
|
1394
|
|
|
// chunkData.slice(28, 32), uInt32_); |
|
1395
|
|
|
// this.ds64.table = chunkData.slice( |
|
1396
|
|
|
// 32, 32 + this.ds64.tableLength); |
|
1397
|
|
|
//} |
|
1398
|
|
|
} else { |
|
1399
|
|
|
if (this.container == "RF64") { |
|
1400
|
|
|
throw Error("Could not find the 'ds64' chunk"); |
|
1401
|
|
|
} |
|
1402
|
|
|
} |
|
1403
|
|
|
} |
|
1404
|
|
|
|
|
1405
|
|
|
/** |
|
1406
|
|
|
* Read the "LIST" chunks of a wave file. |
|
1407
|
|
|
* @param {!Array<Object>} chunks The wav file chunks. |
|
1408
|
|
|
* @private |
|
1409
|
|
|
*/ |
|
1410
|
|
|
readLISTChunk_(chunks) { |
|
1411
|
|
|
/** type {Array<Array<!Object>>>} */ |
|
1412
|
|
|
let listChunks = this.findChunk_(chunks, "LIST", true); |
|
1413
|
|
|
if (listChunks === null) { |
|
1414
|
|
|
return; |
|
1415
|
|
|
} |
|
1416
|
|
|
for (let j=0; j<listChunks.length; j++) { |
|
1417
|
|
|
let subChunk = listChunks[j]; |
|
1418
|
|
|
this.LIST.push({ |
|
1419
|
|
|
"chunkId": subChunk["chunkId"], |
|
1420
|
|
|
"chunkSize": subChunk["chunkSize"], |
|
1421
|
|
|
"format": subChunk["format"], |
|
1422
|
|
|
"chunkData": subChunk["chunkData"], |
|
1423
|
|
|
"subChunks": []}); |
|
1424
|
|
|
for (let x=0; x<subChunk["subChunks"].length; x++) { |
|
1425
|
|
|
this.readLISTSubChunks_(subChunk["subChunks"][x], |
|
1426
|
|
|
subChunk["format"]); |
|
1427
|
|
|
} |
|
1428
|
|
|
} |
|
1429
|
|
|
} |
|
1430
|
|
|
|
|
1431
|
|
|
/** |
|
1432
|
|
|
* Read the sub chunks of a "LIST" chunk. |
|
1433
|
|
|
* @param {!Object} subChunk The "LIST" subchunks. |
|
1434
|
|
|
* @param {string} format The "LIST" format, "adtl" or "INFO". |
|
1435
|
|
|
* @private |
|
1436
|
|
|
*/ |
|
1437
|
|
|
readLISTSubChunks_(subChunk, format) { |
|
1438
|
|
|
// 'labl', 'note', 'ltxt', 'file' |
|
1439
|
|
|
if (format == 'adtl') { |
|
1440
|
|
|
if (["labl", "note"].indexOf(subChunk["chunkId"]) > -1) { |
|
1441
|
|
|
this.LIST[this.LIST.length - 1]["subChunks"].push({ |
|
1442
|
|
|
"chunkId": subChunk["chunkId"], |
|
1443
|
|
|
"chunkSize": subChunk["chunkSize"], |
|
1444
|
|
|
"dwName": byteData_.unpack( |
|
1445
|
|
|
subChunk["chunkData"].slice(0, 4),uInt32_), |
|
1446
|
|
|
"value": this.readZSTR_(subChunk["chunkData"].slice(4)) |
|
1447
|
|
|
}); |
|
1448
|
|
|
} |
|
1449
|
|
|
// RIFF 'INFO' tags like ICRD, ISFT, ICMT |
|
1450
|
|
|
// https://sno.phy.queensu.ca/~phil/exiftool/TagNames/RIFF.html#Info |
|
1451
|
|
|
} else if(format == 'INFO') { |
|
1452
|
|
|
this.LIST[this.LIST.length - 1]["subChunks"].push({ |
|
1453
|
|
|
"chunkId": subChunk["chunkId"], |
|
1454
|
|
|
"chunkSize": subChunk["chunkSize"], |
|
1455
|
|
|
"value": this.readZSTR_(subChunk["chunkData"].slice(0)) |
|
1456
|
|
|
}); |
|
1457
|
|
|
} //else { |
|
1458
|
|
|
// this.LIST[this.LIST.length - 1]["subChunks"].push({ |
|
1459
|
|
|
// "chunkId": subChunk["chunkId"], |
|
1460
|
|
|
// "chunkSize": subChunk["chunkSize"], |
|
1461
|
|
|
// "value": subChunk["chunkData"] |
|
1462
|
|
|
// }); |
|
1463
|
|
|
//} |
|
1464
|
|
|
} |
|
1465
|
|
|
|
|
1466
|
|
|
/** |
|
1467
|
|
|
* Read the "junk" chunk of a wave file. |
|
1468
|
|
|
* @param {!Array<Object>} chunks The wav file chunks. |
|
1469
|
|
|
* @private |
|
1470
|
|
|
*/ |
|
1471
|
|
|
readJunkChunk_(chunks) { |
|
1472
|
|
|
/** type {Array<!Object>} */ |
|
1473
|
|
|
let chunk = this.findChunk_(chunks, "junk"); |
|
1474
|
|
|
if (chunk) { |
|
1475
|
|
|
this.junk = { |
|
1476
|
|
|
"chunkId": chunk["chunkId"], |
|
1477
|
|
|
"chunkSize": chunk["chunkSize"], |
|
1478
|
|
|
"chunkData": chunk["chunkData"] |
|
1479
|
|
|
}; |
|
1480
|
|
|
} |
|
1481
|
|
|
} |
|
1482
|
|
|
|
|
1483
|
|
|
/** |
|
1484
|
|
|
* Read bytes as a ZSTR string. |
|
1485
|
|
|
* @param {!Array<number>|!Uint8Array} bytes The bytes. |
|
1486
|
|
|
* @return {string} The string. |
|
1487
|
|
|
* @private |
|
1488
|
|
|
*/ |
|
1489
|
|
|
readZSTR_(bytes) { |
|
1490
|
|
|
/** type {string} */ |
|
1491
|
|
|
let str = ""; |
|
1492
|
|
|
for (let i=0; i<bytes.length; i++) { |
|
1493
|
|
|
if (bytes[i] === 0) { |
|
1494
|
|
|
break; |
|
1495
|
|
|
} |
|
1496
|
|
|
str += byteData_.unpack([bytes[i]], chr_); |
|
1497
|
|
|
} |
|
1498
|
|
|
return str; |
|
1499
|
|
|
} |
|
1500
|
|
|
|
|
1501
|
|
|
/** |
|
1502
|
|
|
* Read bytes as a string from a RIFF chunk. |
|
1503
|
|
|
* @param {!Array<number>|!Uint8Array} bytes The bytes. |
|
1504
|
|
|
* @param {number} maxSize the max size of the string. |
|
1505
|
|
|
* @return {string} The string. |
|
1506
|
|
|
* @private |
|
1507
|
|
|
*/ |
|
1508
|
|
|
readString_(bytes, maxSize) { |
|
1509
|
|
|
/** type {string} */ |
|
1510
|
|
|
let str = ""; |
|
1511
|
|
|
for (let i=0; i<maxSize; i++) { |
|
1512
|
|
|
str += byteData_.unpack([bytes[this.head_]], chr_); |
|
1513
|
|
|
this.head_++; |
|
1514
|
|
|
} |
|
1515
|
|
|
return str; |
|
1516
|
|
|
} |
|
1517
|
|
|
|
|
1518
|
|
|
/** |
|
1519
|
|
|
* Read a number from a chunk. |
|
1520
|
|
|
* @param {!Array<number>|!Uint8Array} bytes The chunk bytes. |
|
1521
|
|
|
* @param {!Object} bdType The type definition. |
|
1522
|
|
|
* @return {number} The number. |
|
1523
|
|
|
* @private |
|
1524
|
|
|
*/ |
|
1525
|
|
|
read_(bytes, bdType) { |
|
1526
|
|
|
let size = bdType["bits"] / 8; |
|
1527
|
|
|
let value = byteData_.unpack( |
|
1528
|
|
|
bytes.slice(this.head_, this.head_ + size), bdType); |
|
1529
|
|
|
this.head_ += size; |
|
1530
|
|
|
return value; |
|
1531
|
|
|
} |
|
1532
|
|
|
|
|
1533
|
|
|
/** |
|
1534
|
|
|
* Write a variable size string as bytes. If the string is smaller |
|
1535
|
|
|
* than the max size the output array is filled with 0s. |
|
1536
|
|
|
* @param {string} str The string to be written as bytes. |
|
1537
|
|
|
* @param {number} maxSize the max size of the string. |
|
1538
|
|
|
* @return {!Array<number>} The bytes. |
|
1539
|
|
|
* @private |
|
1540
|
|
|
*/ |
|
1541
|
|
|
writeString_(str, maxSize, push=true) { |
|
1542
|
|
|
/** type {!Array<number>} */ |
|
1543
|
|
|
let bytes = byteData_.packArray(str, chr_); |
|
1544
|
|
|
if (push) { |
|
1545
|
|
|
for (let i=bytes.length; i<maxSize; i++) { |
|
1546
|
|
|
bytes.push(0); |
|
1547
|
|
|
} |
|
1548
|
|
|
} |
|
1549
|
|
|
return bytes; |
|
1550
|
|
|
} |
|
1551
|
|
|
|
|
1552
|
|
|
/** |
|
1553
|
|
|
* Turn the samples to bytes. |
|
1554
|
|
|
* @return {!Array<number>} The bytes. |
|
1555
|
|
|
* @private |
|
1556
|
|
|
*/ |
|
1557
|
|
|
samplesToBytes_() { |
|
1558
|
|
|
return byteData_.packArray( |
|
1559
|
|
|
this.data.samples, this.getSamplesType_()); |
|
1560
|
|
|
} |
|
1561
|
|
|
|
|
1562
|
|
|
/** |
|
1563
|
|
|
* Turn bytes to samples and load them in the data.samples property. |
|
1564
|
|
|
* @param {!Array<number>} bytes The bytes. |
|
1565
|
|
|
* @private |
|
1566
|
|
|
*/ |
|
1567
|
|
|
samplesFromBytes_(bytes) { |
|
1568
|
|
|
this.data.samples = byteData_.unpackArray( |
|
1569
|
|
|
bytes, this.getSamplesType_()); |
|
1570
|
|
|
} |
|
1571
|
|
|
|
|
1572
|
|
|
/** |
|
1573
|
|
|
* Get the data type definition for the samples. |
|
1574
|
|
|
* @return {!Object<string, number|boolean>} The type definition. |
|
1575
|
|
|
* @private |
|
1576
|
|
|
*/ |
|
1577
|
|
|
getSamplesType_() { |
|
1578
|
|
|
/** type {!Object<string, number|boolean>} */ |
|
1579
|
|
|
let bdType = { |
|
1580
|
|
|
"be": this.container === "RIFX", |
|
1581
|
|
|
"bits": this.fmt.bitsPerSample == 4 ? 8 : this.fmt.bitsPerSample, |
|
1582
|
|
|
"float": this.fmt.audioFormat == 3 ? true : false |
|
1583
|
|
|
}; |
|
1584
|
|
|
bdType["signed"] = bdType["bits"] == 8 ? false : true; |
|
1585
|
|
|
return bdType; |
|
1586
|
|
|
} |
|
1587
|
|
|
|
|
1588
|
|
|
/** |
|
1589
|
|
|
* Return the bytes of the "bext" chunk. |
|
1590
|
|
|
* @return {!Array<number>} The "bext" chunk bytes. |
|
1591
|
|
|
* @private |
|
1592
|
|
|
*/ |
|
1593
|
|
|
getBextBytes_() { |
|
1594
|
|
|
/** type {!Array<number>} */ |
|
1595
|
|
|
let bytes = []; |
|
1596
|
|
|
if (this.bext.chunkId) { |
|
1597
|
|
|
bytes = bytes.concat( |
|
1598
|
|
|
byteData_.pack(this.bext.chunkId, fourCC_), |
|
1599
|
|
|
byteData_.pack(602 + this.bext.codingHistory.length, uInt32_), |
|
1600
|
|
|
this.writeString_(this.bext.description, 256), |
|
1601
|
|
|
this.writeString_(this.bext.originator, 32), |
|
1602
|
|
|
this.writeString_(this.bext.originatorReference, 32), |
|
1603
|
|
|
this.writeString_(this.bext.originationDate, 10), |
|
1604
|
|
|
this.writeString_(this.bext.originationTime, 8), |
|
1605
|
|
|
byteData_.pack(this.bext.timeReference[0], uInt32_), |
|
1606
|
|
|
byteData_.pack(this.bext.timeReference[1], uInt32_), |
|
1607
|
|
|
byteData_.pack(this.bext.version, uInt16_), |
|
1608
|
|
|
this.writeString_(this.bext.UMID, 64), |
|
1609
|
|
|
byteData_.pack(this.bext.loudnessValue, uInt16_), |
|
1610
|
|
|
byteData_.pack(this.bext.loudnessRange, uInt16_), |
|
1611
|
|
|
byteData_.pack(this.bext.maxTruePeakLevel, uInt16_), |
|
1612
|
|
|
byteData_.pack(this.bext.maxMomentaryLoudness, uInt16_), |
|
1613
|
|
|
byteData_.pack(this.bext.maxShortTermLoudness, uInt16_), |
|
1614
|
|
|
this.writeString_(this.bext.reserved, 180), |
|
1615
|
|
|
this.writeString_( |
|
1616
|
|
|
this.bext.codingHistory, this.bext.codingHistory.length)); |
|
1617
|
|
|
} |
|
1618
|
|
|
return bytes; |
|
1619
|
|
|
} |
|
1620
|
|
|
|
|
1621
|
|
|
/** |
|
1622
|
|
|
* Return the bytes of the "ds64" chunk. |
|
1623
|
|
|
* @return {!Array<number>} The "ds64" chunk bytes. |
|
1624
|
|
|
* @private |
|
1625
|
|
|
*/ |
|
1626
|
|
|
getDs64Bytes_() { |
|
1627
|
|
|
/** type {!Array<number>} */ |
|
1628
|
|
|
let bytes = []; |
|
1629
|
|
|
if (this.ds64.chunkId) { |
|
1630
|
|
|
bytes = bytes.concat( |
|
1631
|
|
|
byteData_.pack(this.ds64.chunkId, fourCC_), |
|
1632
|
|
|
byteData_.pack(this.ds64.chunkSize, uInt32_), // |
|
1633
|
|
|
byteData_.pack(this.ds64.riffSizeHigh, uInt32_), |
|
1634
|
|
|
byteData_.pack(this.ds64.riffSizeLow, uInt32_), |
|
1635
|
|
|
byteData_.pack(this.ds64.dataSizeHigh, uInt32_), |
|
1636
|
|
|
byteData_.pack(this.ds64.dataSizeLow, uInt32_), |
|
1637
|
|
|
byteData_.pack(this.ds64.originationTime, uInt32_), |
|
1638
|
|
|
byteData_.pack(this.ds64.sampleCountHigh, uInt32_), |
|
1639
|
|
|
byteData_.pack(this.ds64.sampleCountLow, uInt32_)); |
|
1640
|
|
|
} |
|
1641
|
|
|
//if (this.ds64.tableLength) { |
|
1642
|
|
|
// ds64Bytes = ds64Bytes.concat( |
|
1643
|
|
|
// byteData_.pack(this.ds64.tableLength, uInt32_), |
|
1644
|
|
|
// this.ds64.table); |
|
1645
|
|
|
//} |
|
1646
|
|
|
return bytes; |
|
1647
|
|
|
} |
|
1648
|
|
|
|
|
1649
|
|
|
/** |
|
1650
|
|
|
* Return the bytes of the "cue " chunk. |
|
1651
|
|
|
* @return {!Array<number>} The "cue " chunk bytes. |
|
1652
|
|
|
* @private |
|
1653
|
|
|
*/ |
|
1654
|
|
|
getCueBytes_() { |
|
1655
|
|
|
/** type {!Array<number>} */ |
|
1656
|
|
|
let bytes = []; |
|
1657
|
|
|
if (this.cue.chunkId) { |
|
1658
|
|
|
let cuePointsBytes = this.getCuePointsBytes_(); |
|
1659
|
|
|
bytes = bytes.concat( |
|
1660
|
|
|
byteData_.pack(this.cue.chunkId, fourCC_), |
|
1661
|
|
|
byteData_.pack(cuePointsBytes.length + 4, uInt32_), |
|
1662
|
|
|
byteData_.pack(this.cue.dwCuePoints, uInt32_), |
|
1663
|
|
|
cuePointsBytes); |
|
1664
|
|
|
} |
|
1665
|
|
|
return bytes; |
|
1666
|
|
|
} |
|
1667
|
|
|
|
|
1668
|
|
|
/** |
|
1669
|
|
|
* Return the bytes of the "cue " points. |
|
1670
|
|
|
* @return {!Array<number>} The "cue " points as an array of bytes. |
|
1671
|
|
|
* @private |
|
1672
|
|
|
*/ |
|
1673
|
|
|
getCuePointsBytes_() { |
|
1674
|
|
|
/** type {!Array<number>} */ |
|
1675
|
|
|
let points = []; |
|
1676
|
|
|
for (let i=0; i<this.cue.dwCuePoints; i++) { |
|
1677
|
|
|
points = points.concat( |
|
1678
|
|
|
byteData_.pack(this.cue.points[i]["dwName"], uInt32_), |
|
1679
|
|
|
byteData_.pack(this.cue.points[i]["dwPosition"], uInt32_), |
|
1680
|
|
|
byteData_.pack(this.cue.points[i]["fccChunk"], fourCC_), |
|
1681
|
|
|
byteData_.pack(this.cue.points[i]["dwChunkStart"], uInt32_), |
|
1682
|
|
|
byteData_.pack(this.cue.points[i]["dwBlockStart"], uInt32_), |
|
1683
|
|
|
byteData_.pack(this.cue.points[i]["dwSampleOffset"], uInt32_)); |
|
1684
|
|
|
} |
|
1685
|
|
|
return points; |
|
1686
|
|
|
} |
|
1687
|
|
|
|
|
1688
|
|
|
/** |
|
1689
|
|
|
* Return the bytes of the "fact" chunk. |
|
1690
|
|
|
* @return {!Array<number>} The "fact" chunk bytes. |
|
1691
|
|
|
* @private |
|
1692
|
|
|
*/ |
|
1693
|
|
|
getFactBytes_() { |
|
1694
|
|
|
/** type {!Array<number>} */ |
|
1695
|
|
|
let bytes = []; |
|
1696
|
|
|
if (this.fact.chunkId) { |
|
1697
|
|
|
bytes = bytes.concat( |
|
1698
|
|
|
byteData_.pack(this.fact.chunkId, fourCC_), |
|
1699
|
|
|
byteData_.pack(this.fact.chunkSize, uInt32_), |
|
1700
|
|
|
byteData_.pack(this.fact.dwSampleLength, uInt32_)); |
|
1701
|
|
|
} |
|
1702
|
|
|
return bytes; |
|
1703
|
|
|
} |
|
1704
|
|
|
|
|
1705
|
|
|
/** |
|
1706
|
|
|
* Return the bytes of the "fmt " chunk. |
|
1707
|
|
|
* @return {!Array<number>} The "fmt" chunk bytes. |
|
1708
|
|
|
* @throws {Error} if no "fmt " chunk is present. |
|
1709
|
|
|
* @private |
|
1710
|
|
|
*/ |
|
1711
|
|
|
getFmtBytes_() { |
|
1712
|
|
|
if (this.fmt.chunkId) { |
|
1713
|
|
|
return [].concat( |
|
1714
|
|
|
byteData_.pack(this.fmt.chunkId, fourCC_), |
|
1715
|
|
|
byteData_.pack(this.fmt.chunkSize, uInt32_), |
|
1716
|
|
|
byteData_.pack(this.fmt.audioFormat, uInt16_), |
|
1717
|
|
|
byteData_.pack(this.fmt.numChannels, uInt16_), |
|
1718
|
|
|
byteData_.pack(this.fmt.sampleRate, uInt32_), |
|
1719
|
|
|
byteData_.pack(this.fmt.byteRate, uInt32_), |
|
1720
|
|
|
byteData_.pack(this.fmt.blockAlign, uInt16_), |
|
1721
|
|
|
byteData_.pack(this.fmt.bitsPerSample, uInt16_), |
|
1722
|
|
|
this.getFmtExtensionBytes_() |
|
1723
|
|
|
); |
|
1724
|
|
|
} |
|
1725
|
|
|
throw Error("Could not find the 'fmt ' chunk"); |
|
1726
|
|
|
} |
|
1727
|
|
|
|
|
1728
|
|
|
/** |
|
1729
|
|
|
* Return the bytes of the fmt extension fields. |
|
1730
|
|
|
* @return {!Array<number>} The fmt extension bytes. |
|
1731
|
|
|
* @private |
|
1732
|
|
|
*/ |
|
1733
|
|
|
getFmtExtensionBytes_() { |
|
1734
|
|
|
/** type {!Array<number>} */ |
|
1735
|
|
|
let extension = []; |
|
1736
|
|
|
if (this.fmt.chunkSize > 16) { |
|
1737
|
|
|
extension = extension.concat( |
|
1738
|
|
|
byteData_.pack(this.fmt.cbSize, uInt16_)); |
|
1739
|
|
|
} |
|
1740
|
|
|
if (this.fmt.chunkSize > 18) { |
|
1741
|
|
|
extension = extension.concat( |
|
1742
|
|
|
byteData_.pack(this.fmt.validBitsPerSample, uInt16_)); |
|
1743
|
|
|
} |
|
1744
|
|
|
if (this.fmt.chunkSize > 20) { |
|
1745
|
|
|
extension = extension.concat( |
|
1746
|
|
|
byteData_.pack(this.fmt.dwChannelMask, uInt32_)); |
|
1747
|
|
|
} |
|
1748
|
|
|
if (this.fmt.chunkSize > 24) { |
|
1749
|
|
|
extension = extension.concat( |
|
1750
|
|
|
byteData_.pack(this.fmt.subformat[0], uInt32_), |
|
1751
|
|
|
byteData_.pack(this.fmt.subformat[1], uInt32_), |
|
1752
|
|
|
byteData_.pack(this.fmt.subformat[2], uInt32_), |
|
1753
|
|
|
byteData_.pack(this.fmt.subformat[3], uInt32_)); |
|
1754
|
|
|
} |
|
1755
|
|
|
return extension; |
|
1756
|
|
|
} |
|
1757
|
|
|
|
|
1758
|
|
|
/** |
|
1759
|
|
|
* Return the bytes of the "LIST" chunk. |
|
1760
|
|
|
* @return {!Array<number>} The "LIST" chunk bytes. |
|
1761
|
|
|
* @export for tests |
|
1762
|
|
|
*/ |
|
1763
|
|
|
getLISTBytes_() { |
|
1764
|
|
|
/** type {!Array<number>} */ |
|
1765
|
|
|
let bytes = []; |
|
1766
|
|
|
for (let i=0; i<this.LIST.length; i++) { |
|
1767
|
|
|
let subChunksBytes = this.getLISTSubChunksBytes_( |
|
1768
|
|
|
this.LIST[i]["subChunks"], this.LIST[i]["format"]); |
|
1769
|
|
|
bytes = bytes.concat( |
|
1770
|
|
|
byteData_.pack(this.LIST[i]["chunkId"], fourCC_), |
|
1771
|
|
|
byteData_.pack(subChunksBytes.length + 4, uInt32_), |
|
1772
|
|
|
byteData_.pack(this.LIST[i]["format"], fourCC_), |
|
1773
|
|
|
subChunksBytes); |
|
1774
|
|
|
} |
|
1775
|
|
|
return bytes; |
|
1776
|
|
|
} |
|
1777
|
|
|
|
|
1778
|
|
|
/** |
|
1779
|
|
|
* Return the bytes of the sub chunks of a "LIST" chunk. |
|
1780
|
|
|
* @param {!Array<Object>} subChunks The "LIST" sub chunks. |
|
1781
|
|
|
* @param {string} format The format of the "LIST" chunk. |
|
1782
|
|
|
* Currently supported values are "adtl" or "INFO". |
|
1783
|
|
|
* @return {!Array<number>} The sub chunk bytes. |
|
1784
|
|
|
* @private |
|
1785
|
|
|
*/ |
|
1786
|
|
|
getLISTSubChunksBytes_(subChunks, format) { |
|
1787
|
|
|
/** type {!Array<number>} */ |
|
1788
|
|
|
let bytes = []; |
|
1789
|
|
|
for (let i=0; i<subChunks.length; i++) { |
|
1790
|
|
|
if (format == "INFO") { |
|
1791
|
|
|
bytes = bytes.concat( |
|
1792
|
|
|
byteData_.pack(subChunks[i]["chunkId"], fourCC_), |
|
1793
|
|
|
byteData_.pack(subChunks[i]["value"].length + 1, uInt32_), |
|
1794
|
|
|
this.writeString_( |
|
1795
|
|
|
subChunks[i]["value"], subChunks[i]["value"].length)); |
|
1796
|
|
|
bytes.push(0); |
|
1797
|
|
|
} else if (format == "adtl") { |
|
1798
|
|
|
if (["labl", "note"].indexOf(subChunks[i]["chunkId"]) > -1) { |
|
1799
|
|
|
bytes = bytes.concat( |
|
1800
|
|
|
byteData_.pack(subChunks[i]["chunkId"], fourCC_), |
|
1801
|
|
|
byteData_.pack( |
|
1802
|
|
|
subChunks[i]["value"].length + 4 + 1, uInt32_), |
|
1803
|
|
|
byteData_.pack(subChunks[i]["dwName"], uInt32_), |
|
1804
|
|
|
this.writeString_( |
|
1805
|
|
|
subChunks[i]["value"], |
|
1806
|
|
|
subChunks[i]["value"].length)); |
|
1807
|
|
|
bytes.push(0); |
|
1808
|
|
|
} |
|
1809
|
|
|
} //else { |
|
1810
|
|
|
// bytes = bytes.concat( |
|
1811
|
|
|
// byteData_.pack( |
|
1812
|
|
|
// subChunks[i]["chunkData"].length, uInt32_), |
|
1813
|
|
|
// subChunks[i]["chunkData"] |
|
1814
|
|
|
// ); |
|
1815
|
|
|
//} |
|
1816
|
|
|
if (bytes.length % 2) { |
|
1817
|
|
|
bytes.push(0); |
|
1818
|
|
|
} |
|
1819
|
|
|
} |
|
1820
|
|
|
return bytes; |
|
1821
|
|
|
} |
|
1822
|
|
|
|
|
1823
|
|
|
/** |
|
1824
|
|
|
* Return the bytes of the "junk" chunk. |
|
1825
|
|
|
* @return {!Array<number>} The "junk" chunk bytes. |
|
1826
|
|
|
* @private |
|
1827
|
|
|
*/ |
|
1828
|
|
|
getJunkBytes_() { |
|
1829
|
|
|
/** type {!Array<number>} */ |
|
1830
|
|
|
let bytes = []; |
|
1831
|
|
|
if (this.junk.chunkId) { |
|
1832
|
|
|
return bytes.concat( |
|
1833
|
|
|
byteData_.pack(this.junk.chunkId, fourCC_), |
|
1834
|
|
|
byteData_.pack(this.junk.chunkData.length, uInt32_), |
|
1835
|
|
|
this.junk.chunkData); |
|
1836
|
|
|
} |
|
1837
|
|
|
return bytes; |
|
1838
|
|
|
} |
|
1839
|
|
|
|
|
1840
|
|
|
/** |
|
1841
|
|
|
* Return "RIFF" if the container is "RF64", the current container name |
|
1842
|
|
|
* otherwise. Used to enforce "RIFF" when RF64 is not allowed. |
|
1843
|
|
|
* @return {string} |
|
1844
|
|
|
* @private |
|
1845
|
|
|
*/ |
|
1846
|
|
|
correctContainer_() { |
|
1847
|
|
|
return this.container == "RF64" ? "RIFF" : this.container; |
|
1848
|
|
|
} |
|
1849
|
|
|
|
|
1850
|
|
|
/** |
|
1851
|
|
|
* Set the string code of the bit depth based on the "fmt " chunk. |
|
1852
|
|
|
* @private |
|
1853
|
|
|
*/ |
|
1854
|
|
|
bitDepthFromFmt_() { |
|
1855
|
|
|
if (this.fmt.audioFormat == 3 && this.fmt.bitsPerSample == 32) { |
|
1856
|
|
|
this.bitDepth = "32f"; |
|
1857
|
|
|
} else if (this.fmt.audioFormat == 6) { |
|
1858
|
|
|
this.bitDepth = "8a"; |
|
1859
|
|
|
} else if (this.fmt.audioFormat == 7) { |
|
1860
|
|
|
this.bitDepth = "8m"; |
|
1861
|
|
|
} else { |
|
1862
|
|
|
this.bitDepth = this.fmt.bitsPerSample.toString(); |
|
1863
|
|
|
} |
|
1864
|
|
|
} |
|
1865
|
|
|
|
|
1866
|
|
|
/** |
|
1867
|
|
|
* Return a .wav file byte buffer with the data from the WaveFile object. |
|
1868
|
|
|
* The return value of this method can be written straight to disk. |
|
1869
|
|
|
* @return {!Uint8Array} The wav file bytes. |
|
1870
|
|
|
* @private |
|
1871
|
|
|
*/ |
|
1872
|
|
|
createWaveFile_() { |
|
1873
|
|
|
/** type {!Array<number>} */ |
|
1874
|
|
|
let samplesBytes = this.samplesToBytes_(); |
|
1875
|
|
|
/** type {!Array<number>} */ |
|
1876
|
|
|
let fileBody = [].concat( |
|
1877
|
|
|
byteData_.pack(this.format, fourCC_), |
|
1878
|
|
|
this.getJunkBytes_(), |
|
1879
|
|
|
this.getDs64Bytes_(), |
|
1880
|
|
|
this.getBextBytes_(), |
|
1881
|
|
|
this.getFmtBytes_(), |
|
1882
|
|
|
this.getFactBytes_(), |
|
1883
|
|
|
byteData_.pack(this.data.chunkId, fourCC_), |
|
1884
|
|
|
byteData_.pack(samplesBytes.length, uInt32_), |
|
1885
|
|
|
samplesBytes, |
|
1886
|
|
|
this.getCueBytes_(), |
|
1887
|
|
|
this.getLISTBytes_()); |
|
1888
|
|
|
// concat with the main header and return a .wav file |
|
1889
|
|
|
return new Uint8Array([].concat( |
|
1890
|
|
|
byteData_.pack(this.container, fourCC_), |
|
1891
|
|
|
byteData_.pack(fileBody.length, uInt32_), |
|
1892
|
|
|
fileBody)); |
|
1893
|
|
|
} |
|
1894
|
|
|
} |
|
1895
|
|
|
|
|
1896
|
|
|
module.exports = WaveFile; |
|
1897
|
|
|
|
rochars /
wavefile
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