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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 WaveFileParser class. |
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* @see https://github.com/rochars/wavefile |
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*/ |
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/** @module wavefile */ |
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import WaveFileReader from './wavefile-reader'; |
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import writeString from './write-string'; |
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import validateNumChannels from './validate-num-channels'; |
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import validateSampleRate from './validate-sample-rate'; |
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import {unpack, packTo, packStringTo, packString, pack} from 'byte-data'; |
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/** |
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* A class to read and write wav files. |
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* @extends WaveFileReader |
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*/ |
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export default class WaveFileParser extends WaveFileReader { |
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constructor(wavBuffer=null) { |
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super(wavBuffer); |
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/** |
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* The bit depth code according to the samples. |
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* @type {string} |
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*/ |
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this.bitDepth = '0'; |
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/** |
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* @type {!Object} |
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* @protected |
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*/ |
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this.dataType = {}; |
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/** |
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* Audio formats. |
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* Formats not listed here should be set to 65534, |
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* the code for WAVE_FORMAT_EXTENSIBLE |
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* @enum {number} |
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* @protected |
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*/ |
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this.WAV_AUDIO_FORMATS = { |
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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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'64': 3 |
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}; |
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if (wavBuffer) { |
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this.bitDepthFromFmt_(); |
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this.updateDataType(); |
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} |
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} |
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/** |
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* Set up the WaveFileParser 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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super.fromBuffer(wavBuffer, samples); |
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this.bitDepthFromFmt_(); |
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this.updateDataType(); |
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} |
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/** |
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* Return a byte buffer representig the WaveFileParser object as a .wav file. |
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* The return value of this method can be written straight to disk. |
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* @return {!Uint8Array} A wav file. |
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* @throws {Error} If bit depth is invalid. |
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* @throws {Error} If the number of channels is invalid. |
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* @throws {Error} If the sample rate is invalid. |
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*/ |
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toBuffer() { |
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this.validateWavHeader(); |
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return this.writeWavBuffer_(); |
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} |
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/** |
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* Return the sample at a given index. |
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* @param {number} index The sample index. |
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* @return {number} The sample. |
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* @throws {Error} If the sample index is off range. |
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*/ |
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getSample(index) { |
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index = index * (this.dataType.bits / 8); |
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if (index + this.dataType.bits / 8 > this.data.samples.length) { |
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throw new Error('Range error'); |
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} |
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return unpack( |
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this.data.samples.slice(index, index + this.dataType.bits / 8), |
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this.dataType); |
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} |
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/** |
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* Set the sample at a given index. |
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* @param {number} index The sample index. |
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* @param {number} sample The sample. |
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* @throws {Error} If the sample index is off range. |
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*/ |
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setSample(index, sample) { |
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index = index * (this.dataType.bits / 8); |
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if (index + this.dataType.bits / 8 > this.data.samples.length) { |
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throw new Error('Range error'); |
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} |
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packTo(sample, this.dataType, this.data.samples, index); |
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} |
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/** |
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* Validate the header of the file. |
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* @throws {Error} If bit depth is invalid. |
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* @throws {Error} If the number of channels is invalid. |
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* @throws {Error} If the sample rate is invalid. |
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* @ignore |
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* @protected |
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*/ |
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validateWavHeader() { |
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this.validateBitDepth_(); |
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if (!validateNumChannels(this.fmt.numChannels, this.fmt.bitsPerSample)) { |
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throw new Error('Invalid number of channels.'); |
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} |
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if (!validateSampleRate( |
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this.fmt.numChannels, this.fmt.bitsPerSample, this.fmt.sampleRate)) { |
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throw new Error('Invalid sample rate.'); |
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} |
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} |
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/** |
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* Update the type definition used to read and write the samples. |
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* @protected |
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*/ |
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updateDataType() { |
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this.dataType = { |
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bits: ((parseInt(this.bitDepth, 10) - 1) | 7) + 1, |
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fp: this.bitDepth == '32f' || this.bitDepth == '64', |
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signed: this.bitDepth != '8', |
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be: this.container == 'RIFX' |
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}; |
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if (['4', '8a', '8m'].indexOf(this.bitDepth) > -1 ) { |
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this.dataType.bits = 8; |
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this.dataType.signed = false; |
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} |
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} |
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/** |
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* Set the string code of the bit depth based on the 'fmt ' chunk. |
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* @private |
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*/ |
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bitDepthFromFmt_() { |
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if (this.fmt.audioFormat === 3 && this.fmt.bitsPerSample === 32) { |
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this.bitDepth = '32f'; |
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} else if (this.fmt.audioFormat === 6) { |
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this.bitDepth = '8a'; |
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} else if (this.fmt.audioFormat === 7) { |
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this.bitDepth = '8m'; |
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} else { |
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this.bitDepth = this.fmt.bitsPerSample.toString(); |
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} |
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} |
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/** |
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* Return a .wav file byte buffer with the data from the WaveFileParser object. |
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* The return value of this method can be written straight to disk. |
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* @return {!Uint8Array} The wav file bytes. |
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* @private |
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*/ |
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writeWavBuffer_() { |
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this.uInt16.be = this.container === 'RIFX'; |
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this.uInt32.be = this.uInt16.be; |
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/** @type {!Array<!Array<number>>} */ |
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let fileBody = [ |
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this.getJunkBytes_(), |
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this.getDs64Bytes_(), |
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this.getBextBytes_(), |
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this.getFmtBytes_(), |
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this.getFactBytes_(), |
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packString(this.data.chunkId), |
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pack(this.data.samples.length, this.uInt32), |
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this.data.samples, |
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this.getCueBytes_(), |
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this.getSmplBytes_(), |
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this.getLISTBytes_() |
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]; |
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/** @type {number} */ |
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let fileBodyLength = 0; |
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for (let i=0; i<fileBody.length; i++) { |
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fileBodyLength += fileBody[i].length; |
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} |
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/** @type {!Uint8Array} */ |
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let file = new Uint8Array(fileBodyLength + 12); |
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/** @type {number} */ |
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let index = 0; |
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index = packStringTo(this.container, file, index); |
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index = packTo(fileBodyLength + 4, this.uInt32, file, index); |
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index = packStringTo(this.format, file, index); |
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for (let i=0; i<fileBody.length; i++) { |
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file.set(fileBody[i], index); |
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index += fileBody[i].length; |
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} |
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return file; |
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} |
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/** |
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* Return the bytes of the 'bext' chunk. |
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* @private |
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*/ |
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getBextBytes_() { |
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/** @type {!Array<number>} */ |
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let bytes = []; |
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this.enforceBext_(); |
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if (this.bext.chunkId) { |
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this.bext.chunkSize = 602 + this.bext.codingHistory.length; |
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bytes = bytes.concat( |
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packString(this.bext.chunkId), |
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pack(602 + this.bext.codingHistory.length, this.uInt32), |
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writeString(this.bext.description, 256), |
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writeString(this.bext.originator, 32), |
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writeString(this.bext.originatorReference, 32), |
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writeString(this.bext.originationDate, 10), |
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writeString(this.bext.originationTime, 8), |
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pack(this.bext.timeReference[0], this.uInt32), |
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pack(this.bext.timeReference[1], this.uInt32), |
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pack(this.bext.version, this.uInt16), |
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writeString(this.bext.UMID, 64), |
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pack(this.bext.loudnessValue, this.uInt16), |
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pack(this.bext.loudnessRange, this.uInt16), |
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pack(this.bext.maxTruePeakLevel, this.uInt16), |
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pack(this.bext.maxMomentaryLoudness, this.uInt16), |
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pack(this.bext.maxShortTermLoudness, this.uInt16), |
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writeString(this.bext.reserved, 180), |
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writeString( |
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this.bext.codingHistory, this.bext.codingHistory.length)); |
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} |
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return bytes; |
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} |
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/** |
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* Make sure a 'bext' chunk is created if BWF data was created in a file. |
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* @private |
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*/ |
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enforceBext_() { |
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for (let prop in this.bext) { |
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if (this.bext.hasOwnProperty(prop)) { |
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if (this.bext[prop] && prop != 'timeReference') { |
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this.bext.chunkId = 'bext'; |
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break; |
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} |
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} |
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} |
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if (this.bext.timeReference[0] || this.bext.timeReference[1]) { |
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this.bext.chunkId = 'bext'; |
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} |
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} |
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/** |
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* Return the bytes of the 'ds64' chunk. |
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* @return {!Array<number>} The 'ds64' chunk bytes. |
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* @private |
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*/ |
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getDs64Bytes_() { |
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/** @type {!Array<number>} */ |
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let bytes = []; |
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if (this.ds64.chunkId) { |
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bytes = bytes.concat( |
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packString(this.ds64.chunkId), |
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pack(this.ds64.chunkSize, this.uInt32), |
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pack(this.ds64.riffSizeHigh, this.uInt32), |
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pack(this.ds64.riffSizeLow, this.uInt32), |
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pack(this.ds64.dataSizeHigh, this.uInt32), |
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pack(this.ds64.dataSizeLow, this.uInt32), |
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pack(this.ds64.originationTime, this.uInt32), |
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pack(this.ds64.sampleCountHigh, this.uInt32), |
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pack(this.ds64.sampleCountLow, this.uInt32)); |
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} |
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//if (this.ds64.tableLength) { |
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// ds64Bytes = ds64Bytes.concat( |
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// pack(this.ds64.tableLength, this.uInt32), |
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// this.ds64.table); |
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//} |
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return bytes; |
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310
|
|
|
} |
|
311
|
|
|
|
|
312
|
|
|
/** |
|
313
|
|
|
* Return the bytes of the 'cue ' chunk. |
|
314
|
|
|
* @return {!Array<number>} The 'cue ' chunk bytes. |
|
315
|
|
|
* @private |
|
316
|
|
|
*/ |
|
317
|
|
|
getCueBytes_() { |
|
318
|
|
|
/** @type {!Array<number>} */ |
|
319
|
|
|
let bytes = []; |
|
320
|
|
|
if (this.cue.chunkId) { |
|
321
|
|
|
/** @type {!Array<number>} */ |
|
322
|
|
|
let cuePointsBytes = this.getCuePointsBytes_(); |
|
323
|
|
|
bytes = bytes.concat( |
|
324
|
|
|
packString(this.cue.chunkId), |
|
325
|
|
|
pack(cuePointsBytes.length + 4, this.uInt32), |
|
326
|
|
|
pack(this.cue.dwCuePoints, this.uInt32), |
|
327
|
|
|
cuePointsBytes); |
|
328
|
|
|
} |
|
329
|
|
|
return bytes; |
|
330
|
|
|
} |
|
331
|
|
|
|
|
332
|
|
|
/** |
|
333
|
|
|
* Return the bytes of the 'cue ' points. |
|
334
|
|
|
* @return {!Array<number>} The 'cue ' points as an array of bytes. |
|
335
|
|
|
* @private |
|
336
|
|
|
*/ |
|
337
|
|
|
getCuePointsBytes_() { |
|
338
|
|
|
/** @type {!Array<number>} */ |
|
339
|
|
|
let points = []; |
|
340
|
|
|
for (let i=0; i<this.cue.dwCuePoints; i++) { |
|
341
|
|
|
points = points.concat( |
|
342
|
|
|
pack(this.cue.points[i].dwName, this.uInt32), |
|
343
|
|
|
pack(this.cue.points[i].dwPosition, this.uInt32), |
|
344
|
|
|
packString(this.cue.points[i].fccChunk), |
|
345
|
|
|
pack(this.cue.points[i].dwChunkStart, this.uInt32), |
|
346
|
|
|
pack(this.cue.points[i].dwBlockStart, this.uInt32), |
|
347
|
|
|
pack(this.cue.points[i].dwSampleOffset, this.uInt32)); |
|
348
|
|
|
} |
|
349
|
|
|
return points; |
|
350
|
|
|
} |
|
351
|
|
|
|
|
352
|
|
|
/** |
|
353
|
|
|
* Return the bytes of the 'smpl' chunk. |
|
354
|
|
|
* @return {!Array<number>} The 'smpl' chunk bytes. |
|
355
|
|
|
* @private |
|
356
|
|
|
*/ |
|
357
|
|
|
getSmplBytes_() { |
|
358
|
|
|
/** @type {!Array<number>} */ |
|
359
|
|
|
let bytes = []; |
|
360
|
|
|
if (this.smpl.chunkId) { |
|
361
|
|
|
/** @type {!Array<number>} */ |
|
362
|
|
|
let smplLoopsBytes = this.getSmplLoopsBytes_(); |
|
363
|
|
|
bytes = bytes.concat( |
|
364
|
|
|
packString(this.smpl.chunkId), |
|
365
|
|
|
pack(smplLoopsBytes.length + 36, this.uInt32), |
|
366
|
|
|
pack(this.smpl.dwManufacturer, this.uInt32), |
|
367
|
|
|
pack(this.smpl.dwProduct, this.uInt32), |
|
368
|
|
|
pack(this.smpl.dwSamplePeriod, this.uInt32), |
|
369
|
|
|
pack(this.smpl.dwMIDIUnityNote, this.uInt32), |
|
370
|
|
|
pack(this.smpl.dwMIDIPitchFraction, this.uInt32), |
|
371
|
|
|
pack(this.smpl.dwSMPTEFormat, this.uInt32), |
|
372
|
|
|
pack(this.smpl.dwSMPTEOffset, this.uInt32), |
|
373
|
|
|
pack(this.smpl.dwNumSampleLoops, this.uInt32), |
|
374
|
|
|
pack(this.smpl.dwSamplerData, this.uInt32), |
|
375
|
|
|
smplLoopsBytes); |
|
376
|
|
|
} |
|
377
|
|
|
return bytes; |
|
378
|
|
|
} |
|
379
|
|
|
|
|
380
|
|
|
/** |
|
381
|
|
|
* Return the bytes of the 'smpl' loops. |
|
382
|
|
|
* @return {!Array<number>} The 'smpl' loops as an array of bytes. |
|
383
|
|
|
* @private |
|
384
|
|
|
*/ |
|
385
|
|
|
getSmplLoopsBytes_() { |
|
386
|
|
|
/** @type {!Array<number>} */ |
|
387
|
|
|
let loops = []; |
|
388
|
|
|
for (let i=0; i<this.smpl.dwNumSampleLoops; i++) { |
|
389
|
|
|
loops = loops.concat( |
|
390
|
|
|
pack(this.smpl.loops[i].dwName, this.uInt32), |
|
391
|
|
|
pack(this.smpl.loops[i].dwType, this.uInt32), |
|
392
|
|
|
pack(this.smpl.loops[i].dwStart, this.uInt32), |
|
393
|
|
|
pack(this.smpl.loops[i].dwEnd, this.uInt32), |
|
394
|
|
|
pack(this.smpl.loops[i].dwFraction, this.uInt32), |
|
395
|
|
|
pack(this.smpl.loops[i].dwPlayCount, this.uInt32)); |
|
396
|
|
|
} |
|
397
|
|
|
return loops; |
|
398
|
|
|
} |
|
399
|
|
|
|
|
400
|
|
|
/** |
|
401
|
|
|
* Return the bytes of the 'fact' chunk. |
|
402
|
|
|
* @return {!Array<number>} The 'fact' chunk bytes. |
|
403
|
|
|
* @private |
|
404
|
|
|
*/ |
|
405
|
|
|
getFactBytes_() { |
|
406
|
|
|
/** @type {!Array<number>} */ |
|
407
|
|
|
let bytes = []; |
|
408
|
|
|
if (this.fact.chunkId) { |
|
409
|
|
|
bytes = bytes.concat( |
|
410
|
|
|
packString(this.fact.chunkId), |
|
411
|
|
|
pack(this.fact.chunkSize, this.uInt32), |
|
412
|
|
|
pack(this.fact.dwSampleLength, this.uInt32)); |
|
413
|
|
|
} |
|
414
|
|
|
return bytes; |
|
415
|
|
|
} |
|
416
|
|
|
|
|
417
|
|
|
/** |
|
418
|
|
|
* Return the bytes of the 'fmt ' chunk. |
|
419
|
|
|
* @return {!Array<number>} The 'fmt' chunk bytes. |
|
420
|
|
|
* @throws {Error} if no 'fmt ' chunk is present. |
|
421
|
|
|
* @private |
|
422
|
|
|
*/ |
|
423
|
|
|
getFmtBytes_() { |
|
424
|
|
|
/** @type {!Array<number>} */ |
|
425
|
|
|
let fmtBytes = []; |
|
426
|
|
|
if (this.fmt.chunkId) { |
|
427
|
|
|
return fmtBytes.concat( |
|
428
|
|
|
packString(this.fmt.chunkId), |
|
429
|
|
|
pack(this.fmt.chunkSize, this.uInt32), |
|
430
|
|
|
pack(this.fmt.audioFormat, this.uInt16), |
|
431
|
|
|
pack(this.fmt.numChannels, this.uInt16), |
|
432
|
|
|
pack(this.fmt.sampleRate, this.uInt32), |
|
433
|
|
|
pack(this.fmt.byteRate, this.uInt32), |
|
434
|
|
|
pack(this.fmt.blockAlign, this.uInt16), |
|
435
|
|
|
pack(this.fmt.bitsPerSample, this.uInt16), |
|
436
|
|
|
this.getFmtExtensionBytes_()); |
|
437
|
|
|
} |
|
438
|
|
|
throw Error('Could not find the "fmt " chunk'); |
|
439
|
|
|
} |
|
440
|
|
|
|
|
441
|
|
|
/** |
|
442
|
|
|
* Return the bytes of the fmt extension fields. |
|
443
|
|
|
* @return {!Array<number>} The fmt extension bytes. |
|
444
|
|
|
* @private |
|
445
|
|
|
*/ |
|
446
|
|
|
getFmtExtensionBytes_() { |
|
447
|
|
|
/** @type {!Array<number>} */ |
|
448
|
|
|
let extension = []; |
|
449
|
|
|
if (this.fmt.chunkSize > 16) { |
|
450
|
|
|
extension = extension.concat( |
|
451
|
|
|
pack(this.fmt.cbSize, this.uInt16)); |
|
452
|
|
|
} |
|
453
|
|
|
if (this.fmt.chunkSize > 18) { |
|
454
|
|
|
extension = extension.concat( |
|
455
|
|
|
pack(this.fmt.validBitsPerSample, this.uInt16)); |
|
456
|
|
|
} |
|
457
|
|
|
if (this.fmt.chunkSize > 20) { |
|
458
|
|
|
extension = extension.concat( |
|
459
|
|
|
pack(this.fmt.dwChannelMask, this.uInt32)); |
|
460
|
|
|
} |
|
461
|
|
|
if (this.fmt.chunkSize > 24) { |
|
462
|
|
|
extension = extension.concat( |
|
463
|
|
|
pack(this.fmt.subformat[0], this.uInt32), |
|
464
|
|
|
pack(this.fmt.subformat[1], this.uInt32), |
|
465
|
|
|
pack(this.fmt.subformat[2], this.uInt32), |
|
466
|
|
|
pack(this.fmt.subformat[3], this.uInt32)); |
|
467
|
|
|
} |
|
468
|
|
|
return extension; |
|
469
|
|
|
} |
|
470
|
|
|
|
|
471
|
|
|
/** |
|
472
|
|
|
* Return the bytes of the 'LIST' chunk. |
|
473
|
|
|
* @return {!Array<number>} The 'LIST' chunk bytes. |
|
474
|
|
|
* @private |
|
475
|
|
|
*/ |
|
476
|
|
|
getLISTBytes_() { |
|
477
|
|
|
/** @type {!Array<number>} */ |
|
478
|
|
|
let bytes = []; |
|
479
|
|
|
for (let i=0; i<this.LIST.length; i++) { |
|
480
|
|
|
/** @type {!Array<number>} */ |
|
481
|
|
|
let subChunksBytes = this.getLISTSubChunksBytes_( |
|
482
|
|
|
this.LIST[i].subChunks, this.LIST[i].format); |
|
483
|
|
|
bytes = bytes.concat( |
|
484
|
|
|
packString(this.LIST[i].chunkId), |
|
485
|
|
|
pack(subChunksBytes.length + 4, this.uInt32), |
|
486
|
|
|
packString(this.LIST[i].format), |
|
487
|
|
|
subChunksBytes); |
|
488
|
|
|
} |
|
489
|
|
|
return bytes; |
|
490
|
|
|
} |
|
491
|
|
|
|
|
492
|
|
|
/** |
|
493
|
|
|
* Return the bytes of the sub chunks of a 'LIST' chunk. |
|
494
|
|
|
* @param {!Array<!Object>} subChunks The 'LIST' sub chunks. |
|
495
|
|
|
* @param {string} format The format of the 'LIST' chunk. |
|
496
|
|
|
* Currently supported values are 'adtl' or 'INFO'. |
|
497
|
|
|
* @return {!Array<number>} The sub chunk bytes. |
|
498
|
|
|
* @private |
|
499
|
|
|
*/ |
|
500
|
|
|
getLISTSubChunksBytes_(subChunks, format) { |
|
501
|
|
|
/** @type {!Array<number>} */ |
|
502
|
|
|
let bytes = []; |
|
503
|
|
|
for (let i=0; i<subChunks.length; i++) { |
|
504
|
|
|
if (format == 'INFO') { |
|
505
|
|
|
bytes = bytes.concat( |
|
506
|
|
|
packString(subChunks[i].chunkId), |
|
507
|
|
|
pack(subChunks[i].value.length + 1, this.uInt32), |
|
508
|
|
|
writeString( |
|
509
|
|
|
subChunks[i].value, subChunks[i].value.length)); |
|
510
|
|
|
bytes.push(0); |
|
511
|
|
|
} else if (format == 'adtl') { |
|
512
|
|
|
if (['labl', 'note'].indexOf(subChunks[i].chunkId) > -1) { |
|
513
|
|
|
bytes = bytes.concat( |
|
514
|
|
|
packString(subChunks[i].chunkId), |
|
515
|
|
|
pack( |
|
516
|
|
|
subChunks[i].value.length + 4 + 1, this.uInt32), |
|
517
|
|
|
pack(subChunks[i].dwName, this.uInt32), |
|
518
|
|
|
writeString( |
|
519
|
|
|
subChunks[i].value, |
|
520
|
|
|
subChunks[i].value.length)); |
|
521
|
|
|
bytes.push(0); |
|
522
|
|
|
} else if (subChunks[i].chunkId == 'ltxt') { |
|
523
|
|
|
bytes = bytes.concat( |
|
524
|
|
|
this.getLtxtChunkBytes_(subChunks[i])); |
|
525
|
|
|
} |
|
526
|
|
|
} |
|
527
|
|
|
if (bytes.length % 2) { |
|
528
|
|
|
bytes.push(0); |
|
529
|
|
|
} |
|
530
|
|
|
} |
|
531
|
|
|
return bytes; |
|
532
|
|
|
} |
|
533
|
|
|
|
|
534
|
|
|
/** |
|
535
|
|
|
* Return the bytes of a 'ltxt' chunk. |
|
536
|
|
|
* @param {!Object} ltxt the 'ltxt' chunk. |
|
537
|
|
|
* @private |
|
538
|
|
|
*/ |
|
539
|
|
|
getLtxtChunkBytes_(ltxt) { |
|
540
|
|
|
return [].concat( |
|
541
|
|
|
packString(ltxt.chunkId), |
|
542
|
|
|
pack(ltxt.value.length + 20, this.uInt32), |
|
543
|
|
|
pack(ltxt.dwName, this.uInt32), |
|
544
|
|
|
pack(ltxt.dwSampleLength, this.uInt32), |
|
545
|
|
|
pack(ltxt.dwPurposeID, this.uInt32), |
|
546
|
|
|
pack(ltxt.dwCountry, this.uInt16), |
|
547
|
|
|
pack(ltxt.dwLanguage, this.uInt16), |
|
548
|
|
|
pack(ltxt.dwDialect, this.uInt16), |
|
549
|
|
|
pack(ltxt.dwCodePage, this.uInt16), |
|
550
|
|
|
writeString(ltxt.value, ltxt.value.length)); |
|
551
|
|
|
} |
|
552
|
|
|
|
|
553
|
|
|
/** |
|
554
|
|
|
* Return the bytes of the 'junk' chunk. |
|
555
|
|
|
* @private |
|
556
|
|
|
*/ |
|
557
|
|
|
getJunkBytes_() { |
|
558
|
|
|
/** @type {!Array<number>} */ |
|
559
|
|
|
let bytes = []; |
|
560
|
|
|
if (this.junk.chunkId) { |
|
561
|
|
|
return bytes.concat( |
|
562
|
|
|
packString(this.junk.chunkId), |
|
563
|
|
|
pack(this.junk.chunkData.length, this.uInt32), |
|
564
|
|
|
this.junk.chunkData); |
|
565
|
|
|
} |
|
566
|
|
|
return bytes; |
|
567
|
|
|
} |
|
568
|
|
|
|
|
569
|
|
|
/** |
|
570
|
|
|
* Validate the bit depth. |
|
571
|
|
|
* @return {boolean} True is the bit depth is valid. |
|
572
|
|
|
* @throws {Error} If bit depth is invalid. |
|
573
|
|
|
* @private |
|
574
|
|
|
*/ |
|
575
|
|
|
validateBitDepth_() { |
|
576
|
|
|
if (!this.WAV_AUDIO_FORMATS[this.bitDepth]) { |
|
577
|
|
|
if (parseInt(this.bitDepth, 10) > 8 && |
|
578
|
|
|
parseInt(this.bitDepth, 10) < 54) { |
|
579
|
|
|
return true; |
|
580
|
|
|
} |
|
581
|
|
|
throw new Error('Invalid bit depth.'); |
|
582
|
|
|
} |
|
583
|
|
|
return true; |
|
584
|
|
|
} |
|
585
|
|
|
} |
|
586
|
|
|
|
rochars /
wavefile
