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/* |
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* Copyright (c) 2017-2019 Rafael da Silva Rocha. |
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* |
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* Permission is hereby granted, free of charge, to any person obtaining |
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* a copy of this software and associated documentation files (the |
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* "Software"), to deal in the Software without restriction, including |
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* without limitation the rights to use, copy, modify, merge, publish, |
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* distribute, sublicense, and/or sell copies of the Software, and to |
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* permit persons to whom the Software is furnished to do so, subject to |
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* the following conditions: |
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* |
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* The above copyright notice and this permission notice shall be |
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* included in all copies or substantial portions of the Software. |
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* |
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, |
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF |
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND |
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE |
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION |
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION |
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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* |
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*/ |
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/** |
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* @fileoverview The WaveFileReader class. |
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* @see https://github.com/rochars/wavefile |
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*/ |
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import { RIFFFile } from './riff-file'; |
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import { unpackString, unpack } from 'byte-data'; |
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/** |
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* A class to read wav files. |
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* @extends RIFFFile |
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*/ |
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export class WaveFileReader extends RIFFFile { |
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constructor() { |
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super(); |
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// Include 'RF64' as a supported container format |
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this.supported_containers.push('RF64'); |
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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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*/ |
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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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*/ |
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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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*/ |
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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 {number} */ |
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dwCuePoints: 0, |
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/** @type {!Array<!Object>} */ |
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points: [], |
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}; |
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/** |
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* The data of the 'smpl' chunk. |
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* @type {!Object<string, *>} |
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*/ |
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this.smpl = { |
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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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dwManufacturer: 0, |
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/** @type {number} */ |
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dwProduct: 0, |
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/** @type {number} */ |
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dwSamplePeriod: 0, |
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/** @type {number} */ |
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dwMIDIUnityNote: 0, |
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/** @type {number} */ |
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dwMIDIPitchFraction: 0, |
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/** @type {number} */ |
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dwSMPTEFormat: 0, |
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/** @type {number} */ |
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dwSMPTEOffset: 0, |
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/** @type {number} */ |
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dwNumSampleLoops: 0, |
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/** @type {number} */ |
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dwSamplerData: 0, |
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/** @type {!Array<!Object>} */ |
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loops: [] |
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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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*/ |
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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: [0, 0], |
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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 'iXML' chunk. |
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* @type {!Object<string, *>} |
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*/ |
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this.iXML = { |
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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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value: '' |
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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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*/ |
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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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chunkSize: 0, |
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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<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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*/ |
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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 {!Uint8Array} */ |
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samples: new Uint8Array(0) |
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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 look like this: |
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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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*/ |
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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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*/ |
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this.junk = { |
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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 '_PMX' chunk. |
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* @type {!Object<string, *>} |
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*/ |
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this._PMX = { |
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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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value: '' |
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}; |
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/** |
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* @type {{be: boolean, bits: number, fp: boolean, signed: boolean}} |
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* @protected |
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*/ |
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this.uInt16 = {bits: 16, be: false, signed: false, fp: false}; |
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} |
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/** |
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* Set up the WaveFileReader object from a byte buffer. |
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* @param {!Uint8Array} wavBuffer The buffer. |
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* @param {boolean=} samples True if the samples should be loaded. |
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* @throws {Error} If container is not RIFF, RIFX or RF64. |
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* @throws {Error} If format is not WAVE. |
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* @throws {Error} If no 'fmt ' chunk is found. |
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* @throws {Error} If no 'data' chunk is found. |
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*/ |
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fromBuffer(wavBuffer, samples=true) { |
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// Always should reset the chunks when reading from a buffer |
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this.clearHeaders(); |
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this.setSignature(wavBuffer); |
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this.uInt16.be = this.uInt32.be; |
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if (this.format != 'WAVE') { |
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throw Error('Could not find the "WAVE" format identifier'); |
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} |
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this.readDs64Chunk_(wavBuffer); |
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this.readFmtChunk_(wavBuffer); |
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this.readFactChunk_(wavBuffer); |
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this.readBextChunk_(wavBuffer); |
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this.readiXMLChunk_(wavBuffer); |
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this.readCueChunk_(wavBuffer); |
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this.readSmplChunk_(wavBuffer); |
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this.readDataChunk_(wavBuffer, samples); |
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this.readJunkChunk_(wavBuffer); |
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this.readLISTChunk_(wavBuffer); |
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this.read_PMXChunk_(wavBuffer); |
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} |
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/** |
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* Reset the chunks of the WaveFileReader instance. |
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* @protected |
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* @ignore |
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*/ |
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clearHeaders() { |
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let tmpWav = new WaveFileReader(); |
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Object.assign(this.fmt, tmpWav.fmt); |
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Object.assign(this.fact, tmpWav.fact); |
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Object.assign(this.cue, tmpWav.cue); |
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Object.assign(this.smpl, tmpWav.smpl); |
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Object.assign(this.bext, tmpWav.bext); |
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Object.assign(this.iXML, tmpWav.iXML); |
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Object.assign(this.ds64, tmpWav.ds64); |
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Object.assign(this.data, tmpWav.data); |
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this.LIST = []; |
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Object.assign(this.junk, tmpWav.junk); |
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Object.assign(this._PMX, tmpWav._PMX); |
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} |
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/** |
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* Read the 'fmt ' chunk of a wave file. |
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* @param {!Uint8Array} buffer The wav file buffer. |
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* @throws {Error} If no 'fmt ' chunk is found. |
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* @private |
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*/ |
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readFmtChunk_(buffer) { |
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/** @type {?Object} */ |
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let chunk = this.findChunk('fmt '); |
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if (chunk) { |
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this.head = chunk.chunkData.start; |
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this.fmt.chunkId = chunk.chunkId; |
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this.fmt.chunkSize = chunk.chunkSize; |
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this.fmt.audioFormat = this.readUInt16_(buffer); |
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this.fmt.numChannels = this.readUInt16_(buffer); |
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this.fmt.sampleRate = this.readUInt32(buffer); |
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this.fmt.byteRate = this.readUInt32(buffer); |
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this.fmt.blockAlign = this.readUInt16_(buffer); |
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this.fmt.bitsPerSample = this.readUInt16_(buffer); |
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this.readFmtExtension_(buffer); |
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} else { |
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throw Error('Could not find the "fmt " chunk'); |
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} |
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} |
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/** |
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* Read the 'fmt ' chunk extension. |
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* @param {!Uint8Array} buffer The wav file buffer. |
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* @private |
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*/ |
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readFmtExtension_(buffer) { |
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if (this.fmt.chunkSize > 16) { |
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this.fmt.cbSize = this.readUInt16_(buffer); |
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if (this.fmt.chunkSize > 18) { |
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this.fmt.validBitsPerSample = this.readUInt16_(buffer); |
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if (this.fmt.chunkSize > 20) { |
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this.fmt.dwChannelMask = this.readUInt32(buffer); |
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this.fmt.subformat = [ |
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this.readUInt32(buffer), |
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this.readUInt32(buffer), |
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this.readUInt32(buffer), |
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this.readUInt32(buffer)]; |
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} |
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} |
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} |
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} |
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/** |
369
|
|
|
* Read the 'fact' chunk of a wav file. |
370
|
|
|
* @param {!Uint8Array} buffer The wav file buffer. |
371
|
|
|
* @private |
372
|
|
|
*/ |
373
|
|
|
readFactChunk_(buffer) { |
374
|
|
|
/** @type {?Object} */ |
375
|
|
|
let chunk = this.findChunk('fact'); |
376
|
|
|
if (chunk) { |
377
|
|
|
this.head = chunk.chunkData.start; |
378
|
|
|
this.fact.chunkId = chunk.chunkId; |
379
|
|
|
this.fact.chunkSize = chunk.chunkSize; |
380
|
|
|
this.fact.dwSampleLength = this.readUInt32(buffer); |
381
|
|
|
} |
382
|
|
|
} |
383
|
|
|
|
384
|
|
|
/** |
385
|
|
|
* Read the 'cue ' chunk of a wave file. |
386
|
|
|
* @param {!Uint8Array} buffer The wav file buffer. |
387
|
|
|
* @private |
388
|
|
|
*/ |
389
|
|
|
readCueChunk_(buffer) { |
390
|
|
|
/** @type {?Object} */ |
391
|
|
|
let chunk = this.findChunk('cue '); |
392
|
|
|
if (chunk) { |
393
|
|
|
this.head = chunk.chunkData.start; |
394
|
|
|
this.cue.chunkId = chunk.chunkId; |
395
|
|
|
this.cue.chunkSize = chunk.chunkSize; |
396
|
|
|
this.cue.dwCuePoints = this.readUInt32(buffer); |
397
|
|
|
for (let i = 0; i < this.cue.dwCuePoints; i++) { |
398
|
|
|
this.cue.points.push({ |
399
|
|
|
dwName: this.readUInt32(buffer), |
400
|
|
|
dwPosition: this.readUInt32(buffer), |
401
|
|
|
fccChunk: this.readString(buffer, 4), |
402
|
|
|
dwChunkStart: this.readUInt32(buffer), |
403
|
|
|
dwBlockStart: this.readUInt32(buffer), |
404
|
|
|
dwSampleOffset: this.readUInt32(buffer), |
405
|
|
|
}); |
406
|
|
|
} |
407
|
|
|
} |
408
|
|
|
} |
409
|
|
|
|
410
|
|
|
/** |
411
|
|
|
* Read the 'smpl' chunk of a wave file. |
412
|
|
|
* @param {!Uint8Array} buffer The wav file buffer. |
413
|
|
|
* @private |
414
|
|
|
*/ |
415
|
|
|
readSmplChunk_(buffer) { |
416
|
|
|
/** @type {?Object} */ |
417
|
|
|
let chunk = this.findChunk('smpl'); |
418
|
|
|
if (chunk) { |
419
|
|
|
this.head = chunk.chunkData.start; |
420
|
|
|
this.smpl.chunkId = chunk.chunkId; |
421
|
|
|
this.smpl.chunkSize = chunk.chunkSize; |
422
|
|
|
this.smpl.dwManufacturer = this.readUInt32(buffer); |
423
|
|
|
this.smpl.dwProduct = this.readUInt32(buffer); |
424
|
|
|
this.smpl.dwSamplePeriod = this.readUInt32(buffer); |
425
|
|
|
this.smpl.dwMIDIUnityNote = this.readUInt32(buffer); |
426
|
|
|
this.smpl.dwMIDIPitchFraction = this.readUInt32(buffer); |
427
|
|
|
this.smpl.dwSMPTEFormat = this.readUInt32(buffer); |
428
|
|
|
this.smpl.dwSMPTEOffset = this.readUInt32(buffer); |
429
|
|
|
this.smpl.dwNumSampleLoops = this.readUInt32(buffer); |
430
|
|
|
this.smpl.dwSamplerData = this.readUInt32(buffer); |
431
|
|
|
for (let i = 0; i < this.smpl.dwNumSampleLoops; i++) { |
432
|
|
|
this.smpl.loops.push({ |
433
|
|
|
dwName: this.readUInt32(buffer), |
434
|
|
|
dwType: this.readUInt32(buffer), |
435
|
|
|
dwStart: this.readUInt32(buffer), |
436
|
|
|
dwEnd: this.readUInt32(buffer), |
437
|
|
|
dwFraction: this.readUInt32(buffer), |
438
|
|
|
dwPlayCount: this.readUInt32(buffer), |
439
|
|
|
}); |
440
|
|
|
} |
441
|
|
|
} |
442
|
|
|
} |
443
|
|
|
|
444
|
|
|
/** |
445
|
|
|
* Read the 'data' chunk of a wave file. |
446
|
|
|
* @param {!Uint8Array} buffer The wav file buffer. |
447
|
|
|
* @param {boolean} samples True if the samples should be loaded. |
448
|
|
|
* @throws {Error} If no 'data' chunk is found. |
449
|
|
|
* @private |
450
|
|
|
*/ |
451
|
|
|
readDataChunk_(buffer, samples) { |
452
|
|
|
/** @type {?Object} */ |
453
|
|
|
let chunk = this.findChunk('data'); |
454
|
|
|
if (chunk) { |
455
|
|
|
this.data.chunkId = 'data'; |
456
|
|
|
this.data.chunkSize = chunk.chunkSize; |
457
|
|
|
if (samples) { |
458
|
|
|
this.data.samples = buffer.slice( |
459
|
|
|
chunk.chunkData.start, |
460
|
|
|
chunk.chunkData.end); |
461
|
|
|
} |
462
|
|
|
} else { |
463
|
|
|
throw Error('Could not find the "data" chunk'); |
464
|
|
|
} |
465
|
|
|
} |
466
|
|
|
|
467
|
|
|
/** |
468
|
|
|
* Read the 'bext' chunk of a wav file. |
469
|
|
|
* @param {!Uint8Array} buffer The wav file buffer. |
470
|
|
|
* @private |
471
|
|
|
*/ |
472
|
|
|
readBextChunk_(buffer) { |
473
|
|
|
/** @type {?Object} */ |
474
|
|
|
let chunk = this.findChunk('bext'); |
475
|
|
|
if (chunk) { |
476
|
|
|
this.head = chunk.chunkData.start; |
477
|
|
|
this.bext.chunkId = chunk.chunkId; |
478
|
|
|
this.bext.chunkSize = chunk.chunkSize; |
479
|
|
|
this.bext.description = this.readString(buffer, 256); |
480
|
|
|
this.bext.originator = this.readString(buffer, 32); |
481
|
|
|
this.bext.originatorReference = this.readString(buffer, 32); |
482
|
|
|
this.bext.originationDate = this.readString(buffer, 10); |
483
|
|
|
this.bext.originationTime = this.readString(buffer, 8); |
484
|
|
|
this.bext.timeReference = [ |
485
|
|
|
this.readUInt32(buffer), |
486
|
|
|
this.readUInt32(buffer)]; |
487
|
|
|
this.bext.version = this.readUInt16_(buffer); |
488
|
|
|
this.bext.UMID = this.readString(buffer, 64); |
489
|
|
|
this.bext.loudnessValue = this.readUInt16_(buffer); |
490
|
|
|
this.bext.loudnessRange = this.readUInt16_(buffer); |
491
|
|
|
this.bext.maxTruePeakLevel = this.readUInt16_(buffer); |
492
|
|
|
this.bext.maxMomentaryLoudness = this.readUInt16_(buffer); |
493
|
|
|
this.bext.maxShortTermLoudness = this.readUInt16_(buffer); |
494
|
|
|
this.bext.reserved = this.readString(buffer, 180); |
495
|
|
|
this.bext.codingHistory = this.readString( |
496
|
|
|
buffer, this.bext.chunkSize - 602); |
497
|
|
|
} |
498
|
|
|
} |
499
|
|
|
|
500
|
|
|
/** |
501
|
|
|
* Read the 'iXML' chunk of a wav file. |
502
|
|
|
* @param {!Uint8Array} buffer The wav file buffer. |
503
|
|
|
* @private |
504
|
|
|
*/ |
505
|
|
|
readiXMLChunk_(buffer) { |
506
|
|
|
/** @type {?Object} */ |
507
|
|
|
let chunk = this.findChunk('iXML'); |
508
|
|
|
if (chunk) { |
509
|
|
|
this.head = chunk.chunkData.start; |
510
|
|
|
this.iXML.chunkId = chunk.chunkId; |
511
|
|
|
this.iXML.chunkSize = chunk.chunkSize; |
512
|
|
|
this.iXML.value = unpackString( |
513
|
|
|
buffer, this.head, this.head + this.iXML.chunkSize); |
514
|
|
|
} |
515
|
|
|
} |
516
|
|
|
|
517
|
|
|
/** |
518
|
|
|
* Read the 'ds64' chunk of a wave file. |
519
|
|
|
* @param {!Uint8Array} buffer The wav file buffer. |
520
|
|
|
* @throws {Error} If no 'ds64' chunk is found and the file is RF64. |
521
|
|
|
* @private |
522
|
|
|
*/ |
523
|
|
|
readDs64Chunk_(buffer) { |
524
|
|
|
/** @type {?Object} */ |
525
|
|
|
let chunk = this.findChunk('ds64'); |
526
|
|
|
if (chunk) { |
527
|
|
|
this.head = chunk.chunkData.start; |
528
|
|
|
this.ds64.chunkId = chunk.chunkId; |
529
|
|
|
this.ds64.chunkSize = chunk.chunkSize; |
530
|
|
|
this.ds64.riffSizeHigh = this.readUInt32(buffer); |
531
|
|
|
this.ds64.riffSizeLow = this.readUInt32(buffer); |
532
|
|
|
this.ds64.dataSizeHigh = this.readUInt32(buffer); |
533
|
|
|
this.ds64.dataSizeLow = this.readUInt32(buffer); |
534
|
|
|
this.ds64.originationTime = this.readUInt32(buffer); |
535
|
|
|
this.ds64.sampleCountHigh = this.readUInt32(buffer); |
536
|
|
|
this.ds64.sampleCountLow = this.readUInt32(buffer); |
537
|
|
|
//if (wav.ds64.chunkSize > 28) { |
538
|
|
|
// wav.ds64.tableLength = unpack( |
539
|
|
|
// chunkData.slice(28, 32), uInt32_); |
540
|
|
|
// wav.ds64.table = chunkData.slice( |
541
|
|
|
// 32, 32 + wav.ds64.tableLength); |
542
|
|
|
//} |
543
|
|
|
} else { |
544
|
|
|
if (this.container == 'RF64') { |
545
|
|
|
throw Error('Could not find the "ds64" chunk'); |
546
|
|
|
} |
547
|
|
|
} |
548
|
|
|
} |
549
|
|
|
|
550
|
|
|
/** |
551
|
|
|
* Read the 'LIST' chunks of a wave file. |
552
|
|
|
* @param {!Uint8Array} buffer The wav file buffer. |
553
|
|
|
* @private |
554
|
|
|
*/ |
555
|
|
|
readLISTChunk_(buffer) { |
556
|
|
|
/** @type {?Object} */ |
557
|
|
|
let listChunks = this.findChunk('LIST', true); |
558
|
|
|
if (listChunks !== null) { |
559
|
|
|
for (let j=0; j < listChunks.length; j++) { |
560
|
|
|
/** @type {!Object} */ |
561
|
|
|
let subChunk = listChunks[j]; |
562
|
|
|
this.LIST.push({ |
563
|
|
|
chunkId: subChunk.chunkId, |
564
|
|
|
chunkSize: subChunk.chunkSize, |
565
|
|
|
format: subChunk.format, |
566
|
|
|
subChunks: []}); |
567
|
|
|
for (let x=0; x<subChunk.subChunks.length; x++) { |
568
|
|
|
this.readLISTSubChunks_(subChunk.subChunks[x], |
569
|
|
|
subChunk.format, buffer); |
570
|
|
|
} |
571
|
|
|
} |
572
|
|
|
} |
573
|
|
|
} |
574
|
|
|
|
575
|
|
|
/** |
576
|
|
|
* Read the sub chunks of a 'LIST' chunk. |
577
|
|
|
* @param {!Object} subChunk The 'LIST' subchunks. |
578
|
|
|
* @param {string} format The 'LIST' format, 'adtl' or 'INFO'. |
579
|
|
|
* @param {!Uint8Array} buffer The wav file buffer. |
580
|
|
|
* @private |
581
|
|
|
*/ |
582
|
|
|
readLISTSubChunks_(subChunk, format, buffer) { |
583
|
|
|
if (format == 'adtl') { |
584
|
|
|
if (['labl', 'note','ltxt'].indexOf(subChunk.chunkId) > -1) { |
585
|
|
|
this.head = subChunk.chunkData.start; |
586
|
|
|
/** @type {!Object<string, string|number>} */ |
587
|
|
|
let item = { |
588
|
|
|
chunkId: subChunk.chunkId, |
589
|
|
|
chunkSize: subChunk.chunkSize, |
590
|
|
|
dwName: this.readUInt32(buffer) |
591
|
|
|
}; |
592
|
|
|
if (subChunk.chunkId == 'ltxt') { |
593
|
|
|
item.dwSampleLength = this.readUInt32(buffer); |
594
|
|
|
item.dwPurposeID = this.readUInt32(buffer); |
595
|
|
|
item.dwCountry = this.readUInt16_(buffer); |
596
|
|
|
item.dwLanguage = this.readUInt16_(buffer); |
597
|
|
|
item.dwDialect = this.readUInt16_(buffer); |
598
|
|
|
item.dwCodePage = this.readUInt16_(buffer); |
599
|
|
|
item.value = ''; // kept for compatibility |
600
|
|
|
} else { |
601
|
|
|
item.value = this.readZSTR_(buffer, this.head); |
602
|
|
|
} |
603
|
|
|
this.LIST[this.LIST.length - 1].subChunks.push(item); |
604
|
|
|
} |
605
|
|
|
// RIFF INFO tags like ICRD, ISFT, ICMT |
606
|
|
|
} else if(format == 'INFO') { |
607
|
|
|
this.head = subChunk.chunkData.start; |
608
|
|
|
this.LIST[this.LIST.length - 1].subChunks.push({ |
609
|
|
|
chunkId: subChunk.chunkId, |
610
|
|
|
chunkSize: subChunk.chunkSize, |
611
|
|
|
value: this.readZSTR_(buffer, this.head) |
612
|
|
|
}); |
613
|
|
|
} |
614
|
|
|
} |
615
|
|
|
|
616
|
|
|
/** |
617
|
|
|
* Read the 'junk' chunk of a wave file. |
618
|
|
|
* @param {!Uint8Array} buffer The wav file buffer. |
619
|
|
|
* @private |
620
|
|
|
*/ |
621
|
|
|
readJunkChunk_(buffer) { |
622
|
|
|
/** @type {?Object} */ |
623
|
|
|
let chunk = this.findChunk('junk'); |
624
|
|
|
if (chunk) { |
625
|
|
|
this.junk = { |
626
|
|
|
chunkId: chunk.chunkId, |
627
|
|
|
chunkSize: chunk.chunkSize, |
628
|
|
|
chunkData: [].slice.call(buffer.slice( |
629
|
|
|
chunk.chunkData.start, |
630
|
|
|
chunk.chunkData.end)) |
631
|
|
|
}; |
632
|
|
|
} |
633
|
|
|
} |
634
|
|
|
|
635
|
|
|
/** |
636
|
|
|
* Read the '_PMX' chunk of a wav file. |
637
|
|
|
* @param {!Uint8Array} buffer The wav file buffer. |
638
|
|
|
* @private |
639
|
|
|
*/ |
640
|
|
|
read_PMXChunk_(buffer) { |
641
|
|
|
/** @type {?Object} */ |
642
|
|
|
let chunk = this.findChunk('_PMX'); |
643
|
|
|
if (chunk) { |
644
|
|
|
this.head = chunk.chunkData.start; |
645
|
|
|
this._PMX.chunkId = chunk.chunkId; |
646
|
|
|
this._PMX.chunkSize = chunk.chunkSize; |
647
|
|
|
this._PMX.value = unpackString( |
648
|
|
|
buffer, this.head, this.head + this._PMX.chunkSize); |
649
|
|
|
} |
650
|
|
|
} |
651
|
|
|
|
652
|
|
|
/** |
653
|
|
|
* Read bytes as a ZSTR string. |
654
|
|
|
* @param {!Uint8Array} bytes The bytes. |
655
|
|
|
* @param {number} index the index to start reading. |
656
|
|
|
* @return {string} The string. |
657
|
|
|
* @private |
658
|
|
|
*/ |
659
|
|
|
readZSTR_(bytes, index=0) { |
660
|
|
|
for (let i = index; i < bytes.length; i++) { |
661
|
|
|
this.head++; |
662
|
|
|
if (bytes[i] === 0) { |
663
|
|
|
break; |
664
|
|
|
} |
665
|
|
|
} |
666
|
|
|
return unpackString(bytes, index, this.head - 1); |
667
|
|
|
} |
668
|
|
|
|
669
|
|
|
/** |
670
|
|
|
* Read a number from a chunk. |
671
|
|
|
* @param {!Uint8Array} bytes The chunk bytes. |
672
|
|
|
* @return {number} The number. |
673
|
|
|
* @private |
674
|
|
|
*/ |
675
|
|
|
readUInt16_(bytes) { |
676
|
|
|
/** @type {number} */ |
677
|
|
|
let value = unpack(bytes, this.uInt16, this.head); |
678
|
|
|
this.head += 2; |
679
|
|
|
return value; |
680
|
|
|
} |
681
|
|
|
} |
682
|
|
|
|