wavefile-creator.js ➔ dwChannelMask_ - Code Metrics - Inspection of "Update CHANGELOG v10.2.0 release date" - rochars/wavefile - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( c898d2...a76502 )

by Rafael S.

created 2020-01-17 00:07 UTC

wavefile-creator.js ➔ dwChannelMask_ B

↳ Parent: lib/wavefile-creator.js

Complexity

Conditions

Size

Total Lines	21
Code Lines	13

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	6
eloc	13
dl	0
loc	21
rs	8.6666
c	0
b	0
f	0

/*
 * Copyright (c) 2017-2019 Rafael da Silva Rocha.
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

/**
 * @fileoverview The WaveFileCreator class.
 * @see https://github.com/rochars/wavefile
 */

import { WaveFileParser } from './wavefile-parser';
import { interleave, deInterleave } from './parsers/interleave';
import { validateNumChannels } from './validators/validate-num-channels'; 
import { validateSampleRate } from './validators/validate-sample-rate';
import { packArrayTo, unpackArrayTo, packTo, unpack } from 'byte-data';

/**
 * A class to read, write and create wav files.
 * @extends WaveFileParser
 * @ignore
 */
export class WaveFileCreator extends WaveFileParser {

  constructor() {
    super();
    /**
     * The bit depth code according to the samples.
     * @type {string}
     */
    this.bitDepth = '0';
    /**
     * @type {{be: boolean, bits: number, fp: boolean, signed: boolean}}
     * @protected
     */
    this.dataType = {bits: 0, be: false, signed: false, fp: false};
    /**
     * Audio formats.
     * Formats not listed here should be set to 65534,
     * the code for WAVE_FORMAT_EXTENSIBLE
     * @enum {number}
     * @protected
     */
    this.WAV_AUDIO_FORMATS = {
      '4': 17,
      '8': 1,
      '8a': 6,
      '8m': 7,
      '16': 1,
      '24': 1,
      '32': 1,
      '32f': 3,
      '64': 3
    };
  }

  /**
   * Set up the WaveFileCreator object based on the arguments passed.
   * Existing chunks are reset.
   * @param {number} numChannels The number of channels.
   * @param {number} sampleRate The sample rate.
   *    Integers like 8000, 44100, 48000, 96000, 192000.
   * @param {string} bitDepthCode The audio bit depth code.
   *    One of '4', '8', '8a', '8m', '16', '24', '32', '32f', '64'
   *    or any value between '8' and '32' (like '12').
   * @param {!Array|!TypedArray} samples The samples.
   * @param {?Object} options Optional. Used to force the container
   *    as RIFX with {'container': 'RIFX'}
   * @throws {Error} If any argument does not meet the criteria.
   */
  fromScratch(numChannels, sampleRate, bitDepthCode, samples, options={}) {
    // reset all chunks
    this.clearHeaders();
    this.newWavFile_(numChannels, sampleRate, bitDepthCode, samples, options);
  }

  /**
   * Set up the WaveFileParser object from a byte buffer.
   * @param {!Uint8Array} wavBuffer The buffer.
   * @param {boolean=} samples True if the samples should be loaded.
   * @throws {Error} If container is not RIFF, RIFX or RF64.
   * @throws {Error} If format is not WAVE.
   * @throws {Error} If no 'fmt ' chunk is found.
   * @throws {Error} If no 'data' chunk is found.
   */
  fromBuffer(wavBuffer, samples=true) {
    super.fromBuffer(wavBuffer, samples);
    this.bitDepthFromFmt_();
    this.updateDataType_();
  }

  /**
   * Return a byte buffer representig the WaveFileParser object as a .wav file.
   * The return value of this method can be written straight to disk.
   * @return {!Uint8Array} A wav file.
   * @throws {Error} If bit depth is invalid.
   * @throws {Error} If the number of channels is invalid.
   * @throws {Error} If the sample rate is invalid.
   */
  toBuffer() {
    this.validateWavHeader_();
    return super.toBuffer();
  }

  /**
   * Return the samples packed in a Float64Array.
   * @param {?boolean} interleaved True to return interleaved samples,
   *   false to return the samples de-interleaved. Defaults to false.
   * @return {!Array|!TypedArray} the samples.
   */
  getSamples(interleaved=false) {
    /**
     * A Float64Array created with a size to match the
     * the length of the samples.
     * @type {!Array|!TypedArray}
     */
    let samples = new Float64Array(
      this.data.samples.length / (this.dataType.bits / 8));
    // Unpack all the samples
    unpackArrayTo(this.data.samples, this.dataType, samples);
    if (!interleaved && this.fmt.numChannels > 1) {
      return deInterleave(samples, this.fmt.numChannels);
    }
    return samples;
  }

  /**
   * Return the sample at a given index.
   * @param {number} index The sample index.
   * @return {number} The sample.
   * @throws {Error} If the sample index is off range.
   */
  getSample(index) {
    index = index * (this.dataType.bits / 8);
    if (index + this.dataType.bits / 8 > this.data.samples.length) {
      throw new Error('Range error');
    }
    return unpack(
      this.data.samples.slice(index, index + this.dataType.bits / 8),
      this.dataType);
  }

  /**
   * Set the sample at a given index.
   * @param {number} index The sample index.
   * @param {number} sample The sample.
   * @throws {Error} If the sample index is off range.
   */
  setSample(index, sample) {
    index = index * (this.dataType.bits / 8);
    if (index + this.dataType.bits / 8 > this.data.samples.length) {
      throw new Error('Range error');
    }
    packTo(sample, this.dataType, this.data.samples, index);
  }

  /**
   * Return the value of the iXML chunk.
   * @return {string} The contents of the iXML chunk.
   */
  getiXML() {
    return this.iXML.value;
  }

  /**
   * Set the value of the iXML chunk.
   * @param {string} iXMLValue The value for the iXML chunk.
   * @throws {TypeError} If the value is not a string.
   */
  setiXML(iXMLValue) {
    if (typeof iXMLValue !== 'string') {
      throw new TypeError('iXML value must be a string.');
    }
    this.iXML.value = iXMLValue;
    this.iXML.chunkId = 'iXML';
  }

  /**
   * Get the value of the _PMX chunk.
   * @return {string} The contents of the _PMX chunk.
   */
  get_PMX() {
    return this._PMX.value;
  }

  /**
   * Set the value of the _PMX chunk.
   * @param {string} _PMXValue The value for the _PMX chunk.
   * @throws {TypeError} If the value is not a string.
   */
  set_PMX(_PMXValue) {
    if (typeof _PMXValue !== 'string') {
      throw new TypeError('_PMX value must be a string.');
    }
    this._PMX.value = _PMXValue;
    this._PMX.chunkId = '_PMX';
  }

  /**
   * Set up the WaveFileCreator object based on the arguments passed.
   * @param {number} numChannels The number of channels.
   * @param {number} sampleRate The sample rate.
   *    Integers like 8000, 44100, 48000, 96000, 192000.
   * @param {string} bitDepthCode The audio bit depth code.
   *    One of '4', '8', '8a', '8m', '16', '24', '32', '32f', '64'
   *    or any value between '8' and '32' (like '12').
   * @param {!Array|!TypedArray} samples The samples.
   * @param {?Object} options Optional. Used to force the container
   *    as RIFX with {'container': 'RIFX'}
   * @throws {Error} If any argument does not meet the criteria.
   * @private
   */
  newWavFile_(numChannels, sampleRate, bitDepthCode, samples, options={}) {
    if (!options.container) {
      options.container = 'RIFF';
    }
    this.container = options.container;
    this.bitDepth = bitDepthCode;
    samples = interleave(samples);
    this.updateDataType_();
    /** @type {number} */
    let numBytes = this.dataType.bits / 8;
    this.data.samples = new Uint8Array(samples.length * numBytes);
    packArrayTo(samples, this.dataType, this.data.samples);
    this.makeWavHeader_(
      bitDepthCode, numChannels, sampleRate,
      numBytes, this.data.samples.length, options);
    this.data.chunkId = 'data';
    this.data.chunkSize = this.data.samples.length;
    this.validateWavHeader_();
  }

  /**
   * Define the header of a wav file.
   * @param {string} bitDepthCode The audio bit depth
   * @param {number} numChannels The number of channels
   * @param {number} sampleRate The sample rate.
   * @param {number} numBytes The number of bytes each sample use.
   * @param {number} samplesLength The length of the samples in bytes.
   * @param {!Object} options The extra options, like container defintion.
   * @private
   */
  makeWavHeader_(
    bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options) {
    if (bitDepthCode == '4') {
      this.createADPCMHeader_(
        bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options);

    } else if (bitDepthCode == '8a' || bitDepthCode == '8m') {
      this.createALawMulawHeader_(
        bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options);

    } else if(Object.keys(this.WAV_AUDIO_FORMATS).indexOf(bitDepthCode) == -1 ||
        numChannels > 2) {
      this.createExtensibleHeader_(
        bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options);

    } else {
      this.createPCMHeader_(
        bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options);      
    }
  }

  /**
   * Create the header of a linear PCM wave file.
   * @param {string} bitDepthCode The audio bit depth
   * @param {number} numChannels The number of channels
   * @param {number} sampleRate The sample rate.
   * @param {number} numBytes The number of bytes each sample use.
   * @param {number} samplesLength The length of the samples in bytes.
   * @param {!Object} options The extra options, like container defintion.
   * @private
   */
  createPCMHeader_(
    bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options) {
    this.container = options.container;
    this.chunkSize = 36 + samplesLength;
    this.format = 'WAVE';
    this.bitDepth = bitDepthCode;
    this.fmt = {
      chunkId: 'fmt ',
      chunkSize: 16,
      audioFormat: this.WAV_AUDIO_FORMATS[bitDepthCode] || 65534,
      numChannels: numChannels,
      sampleRate: sampleRate,
      byteRate: (numChannels * numBytes) * sampleRate,
      blockAlign: numChannels * numBytes,
      bitsPerSample: parseInt(bitDepthCode, 10),
      cbSize: 0,
      validBitsPerSample: 0,
      dwChannelMask: 0,
      subformat: []
    };
  }

  /**
   * Create the header of a ADPCM wave file.
   * @param {string} bitDepthCode The audio bit depth
   * @param {number} numChannels The number of channels
   * @param {number} sampleRate The sample rate.
   * @param {number} numBytes The number of bytes each sample use.
   * @param {number} samplesLength The length of the samples in bytes.
   * @param {!Object} options The extra options, like container defintion.
   * @private
   */
  createADPCMHeader_(
    bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options) {
    this.createPCMHeader_(
      bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options);
    this.chunkSize = 40 + samplesLength;
    this.fmt.chunkSize = 20;
    this.fmt.byteRate = 4055;
    this.fmt.blockAlign = 256;
    this.fmt.bitsPerSample = 4;
    this.fmt.cbSize = 2;
    this.fmt.validBitsPerSample = 505;
    this.fact = {
      chunkId: 'fact',
      chunkSize: 4,
      dwSampleLength: samplesLength * 2
    };
  }

  /**
   * Create the header of WAVE_FORMAT_EXTENSIBLE file.
   * @param {string} bitDepthCode The audio bit depth
   * @param {number} numChannels The number of channels
   * @param {number} sampleRate The sample rate.
   * @param {number} numBytes The number of bytes each sample use.
   * @param {number} samplesLength The length of the samples in bytes.
   * @param {!Object} options The extra options, like container defintion.
   * @private
   */
  createExtensibleHeader_(
      bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options) {
    this.createPCMHeader_(
      bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options);
    this.chunkSize = 36 + 24 + samplesLength;
    this.fmt.chunkSize = 40;
    this.fmt.bitsPerSample = ((parseInt(bitDepthCode, 10) - 1) | 7) + 1;
    this.fmt.cbSize = 22;
    this.fmt.validBitsPerSample = parseInt(bitDepthCode, 10);
    this.fmt.dwChannelMask = dwChannelMask_(numChannels);
    // subformat 128-bit GUID as 4 32-bit values
    // only supports uncompressed integer PCM samples
    this.fmt.subformat = [1, 1048576, 2852126848, 1905997824];
  }

  /**
   * Create the header of mu-Law and A-Law wave files.
   * @param {string} bitDepthCode The audio bit depth
   * @param {number} numChannels The number of channels
   * @param {number} sampleRate The sample rate.
   * @param {number} numBytes The number of bytes each sample use.
   * @param {number} samplesLength The length of the samples in bytes.
   * @param {!Object} options The extra options, like container defintion.
   * @private
   */
  createALawMulawHeader_(
      bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options) {
    this.createPCMHeader_(
      bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options);
    this.chunkSize = 40 + samplesLength;
    this.fmt.chunkSize = 20;
    this.fmt.cbSize = 2;
    this.fmt.validBitsPerSample = 8;
    this.fact = {
      chunkId: 'fact',
      chunkSize: 4,
      dwSampleLength: samplesLength
    };
  }

  /**
   * Set the string code of the bit depth based on the 'fmt ' chunk.
   * @private
   */
  bitDepthFromFmt_() {
    if (this.fmt.audioFormat === 3 && this.fmt.bitsPerSample === 32) {
      this.bitDepth = '32f';
    } else if (this.fmt.audioFormat === 6) {
      this.bitDepth = '8a';
    } else if (this.fmt.audioFormat === 7) {
      this.bitDepth = '8m';
    } else {
      this.bitDepth = this.fmt.bitsPerSample.toString();
    }
  }

  /**
   * Validate the bit depth.
   * @return {boolean} True is the bit depth is valid.
   * @throws {Error} If bit depth is invalid.
   * @private
   */
  validateBitDepth_() {
    if (!this.WAV_AUDIO_FORMATS[this.bitDepth]) {
      if (parseInt(this.bitDepth, 10) > 8 &&
          parseInt(this.bitDepth, 10) < 54) {
        return true;
      }
      throw new Error('Invalid bit depth.');
    }
    return true;
  }

  /**
   * Update the type definition used to read and write the samples.
   * @private
   */
  updateDataType_() {
    this.dataType = {
      bits: ((parseInt(this.bitDepth, 10) - 1) | 7) + 1,
      fp: this.bitDepth == '32f' || this.bitDepth == '64',
      signed: this.bitDepth != '8',
      be: this.container == 'RIFX'
    };
    if (['4', '8a', '8m'].indexOf(this.bitDepth) > -1 ) {
      this.dataType.bits = 8;
      this.dataType.signed = false;
    }
  }

  /**
   * Validate the header of the file.
   * @throws {Error} If bit depth is invalid.
   * @throws {Error} If the number of channels is invalid.
   * @throws {Error} If the sample rate is invalid.
   * @ignore
   * @private
   */
  validateWavHeader_() {
    this.validateBitDepth_();
    if (!validateNumChannels(this.fmt.numChannels, this.fmt.bitsPerSample)) {
      throw new Error('Invalid number of channels.');
    }
    if (!validateSampleRate(
        this.fmt.numChannels, this.fmt.bitsPerSample, this.fmt.sampleRate)) {
      throw new Error('Invalid sample rate.');
    }
  }
}

/**
 * Return the value for dwChannelMask according to the number of channels.
 * @param {number} numChannels the number of channels.
 * @return {number} the dwChannelMask value.
 * @private
 */
function dwChannelMask_(numChannels) {
  /** @type {number} */
  let mask = 0;
  // mono = FC
  if (numChannels === 1) {
    mask = 0x4;
  // stereo = FL, FR
  } else if (numChannels === 2) {
    mask = 0x3;
  // quad = FL, FR, BL, BR
  } else if (numChannels === 4) {
    mask = 0x33;
  // 5.1 = FL, FR, FC, LF, BL, BR
  } else if (numChannels === 6) {
    mask = 0x3F;
  // 7.1 = FL, FR, FC, LF, BL, BR, SL, SR
  } else if (numChannels === 8) {
    mask = 0x63F;
  }
  return mask;
}


1			/*
2			* Copyright (c) 2017-2019 Rafael da Silva Rocha.
3			*
4			* Permission is hereby granted, free of charge, to any person obtaining
5			* a copy of this software and associated documentation files (the
6			* "Software"), to deal in the Software without restriction, including
7			* without limitation the rights to use, copy, modify, merge, publish,
8			* distribute, sublicense, and/or sell copies of the Software, and to
9			* permit persons to whom the Software is furnished to do so, subject to
10			* the following conditions:
11			*
12			* The above copyright notice and this permission notice shall be
13			* included in all copies or substantial portions of the Software.
14			*
15			* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16			* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17			* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18			* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
19			* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
20			* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
21			* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22			*
23			*/
24
25			/**
26			* @fileoverview The WaveFileCreator class.
27			* @see https://github.com/rochars/wavefile
28			*/
29
30			import { WaveFileParser } from './wavefile-parser';
31			import { interleave, deInterleave } from './parsers/interleave';
32			import { validateNumChannels } from './validators/validate-num-channels';
33			import { validateSampleRate } from './validators/validate-sample-rate';
34			import { packArrayTo, unpackArrayTo, packTo, unpack } from 'byte-data';
35
36			/**
37			* A class to read, write and create wav files.
38			* @extends WaveFileParser
39			* @ignore
40			*/
41			export class WaveFileCreator extends WaveFileParser {
42
43			constructor() {
44			super();
45			/**
46			* The bit depth code according to the samples.
47			* @type {string}
48			*/
49			this.bitDepth = '0';
50			/**
51			* @type {{be: boolean, bits: number, fp: boolean, signed: boolean}}
52			* @protected
53			*/
54			this.dataType = {bits: 0, be: false, signed: false, fp: false};
55			/**
56			* Audio formats.
57			* Formats not listed here should be set to 65534,
58			* the code for WAVE_FORMAT_EXTENSIBLE
59			* @enum {number}
60			* @protected
61			*/
62			this.WAV_AUDIO_FORMATS = {
63			'4': 17,
64			'8': 1,
65			'8a': 6,
66			'8m': 7,
67			'16': 1,
68			'24': 1,
69			'32': 1,
70			'32f': 3,
71			'64': 3
72			};
73			}
74
75			/**
76			* Set up the WaveFileCreator object based on the arguments passed.
77			* Existing chunks are reset.
78			* @param {number} numChannels The number of channels.
79			* @param {number} sampleRate The sample rate.
80			* Integers like 8000, 44100, 48000, 96000, 192000.
81			* @param {string} bitDepthCode The audio bit depth code.
82			* One of '4', '8', '8a', '8m', '16', '24', '32', '32f', '64'
83			* or any value between '8' and '32' (like '12').
84			* @param {!Array\|!TypedArray} samples The samples.
85			* @param {?Object} options Optional. Used to force the container
86			* as RIFX with {'container': 'RIFX'}
87			* @throws {Error} If any argument does not meet the criteria.
88			*/
89			fromScratch(numChannels, sampleRate, bitDepthCode, samples, options={}) {
90			// reset all chunks
91			this.clearHeaders();
92			this.newWavFile_(numChannels, sampleRate, bitDepthCode, samples, options);
93			}
94
95			/**
96			* Set up the WaveFileParser object from a byte buffer.
97			* @param {!Uint8Array} wavBuffer The buffer.
98			* @param {boolean=} samples True if the samples should be loaded.
99			* @throws {Error} If container is not RIFF, RIFX or RF64.
100			* @throws {Error} If format is not WAVE.
101			* @throws {Error} If no 'fmt ' chunk is found.
102			* @throws {Error} If no 'data' chunk is found.
103			*/
104			fromBuffer(wavBuffer, samples=true) {
105			super.fromBuffer(wavBuffer, samples);
106			this.bitDepthFromFmt_();
107			this.updateDataType_();
108			}
109
110			/**
111			* Return a byte buffer representig the WaveFileParser object as a .wav file.
112			* The return value of this method can be written straight to disk.
113			* @return {!Uint8Array} A wav file.
114			* @throws {Error} If bit depth is invalid.
115			* @throws {Error} If the number of channels is invalid.
116			* @throws {Error} If the sample rate is invalid.
117			*/
118			toBuffer() {
119			this.validateWavHeader_();
120			return super.toBuffer();
121			}
122
123			/**
124			* Return the samples packed in a Float64Array.
125			* @param {?boolean} interleaved True to return interleaved samples,
126			* false to return the samples de-interleaved. Defaults to false.
127			* @return {!Array\|!TypedArray} the samples.
128			*/
129			getSamples(interleaved=false) {
130			/**
131			* A Float64Array created with a size to match the
132			* the length of the samples.
133			* @type {!Array\|!TypedArray}
134			*/
135			let samples = new Float64Array(
136			this.data.samples.length / (this.dataType.bits / 8));
137			// Unpack all the samples
138			unpackArrayTo(this.data.samples, this.dataType, samples);
139			if (!interleaved && this.fmt.numChannels > 1) {
140			return deInterleave(samples, this.fmt.numChannels);
141			}
142			return samples;
143			}
144
145			/**
146			* Return the sample at a given index.
147			* @param {number} index The sample index.
148			* @return {number} The sample.
149			* @throws {Error} If the sample index is off range.
150			*/
151			getSample(index) {
152			index = index * (this.dataType.bits / 8);
153			if (index + this.dataType.bits / 8 > this.data.samples.length) {
154			throw new Error('Range error');
155			}
156			return unpack(
157			this.data.samples.slice(index, index + this.dataType.bits / 8),
158			this.dataType);
159			}
160
161			/**
162			* Set the sample at a given index.
163			* @param {number} index The sample index.
164			* @param {number} sample The sample.
165			* @throws {Error} If the sample index is off range.
166			*/
167			setSample(index, sample) {
168			index = index * (this.dataType.bits / 8);
169			if (index + this.dataType.bits / 8 > this.data.samples.length) {
170			throw new Error('Range error');
171			}
172			packTo(sample, this.dataType, this.data.samples, index);
173			}
174
175			/**
176			* Return the value of the iXML chunk.
177			* @return {string} The contents of the iXML chunk.
178			*/
179			getiXML() {
180			return this.iXML.value;
181			}
182
183			/**
184			* Set the value of the iXML chunk.
185			* @param {string} iXMLValue The value for the iXML chunk.
186			* @throws {TypeError} If the value is not a string.
187			*/
188			setiXML(iXMLValue) {
189			if (typeof iXMLValue !== 'string') {
190			throw new TypeError('iXML value must be a string.');
191			}
192			this.iXML.value = iXMLValue;
193			this.iXML.chunkId = 'iXML';
194			}
195
196			/**
197			* Get the value of the _PMX chunk.
198			* @return {string} The contents of the _PMX chunk.
199			*/
200			get_PMX() {
201			return this._PMX.value;
202			}
203
204			/**
205			* Set the value of the _PMX chunk.
206			* @param {string} _PMXValue The value for the _PMX chunk.
207			* @throws {TypeError} If the value is not a string.
208			*/
209			set_PMX(_PMXValue) {
210			if (typeof _PMXValue !== 'string') {
211			throw new TypeError('_PMX value must be a string.');
212			}
213			this._PMX.value = _PMXValue;
214			this._PMX.chunkId = '_PMX';
215			}
216
217			/**
218			* Set up the WaveFileCreator object based on the arguments passed.
219			* @param {number} numChannels The number of channels.
220			* @param {number} sampleRate The sample rate.
221			* Integers like 8000, 44100, 48000, 96000, 192000.
222			* @param {string} bitDepthCode The audio bit depth code.
223			* One of '4', '8', '8a', '8m', '16', '24', '32', '32f', '64'
224			* or any value between '8' and '32' (like '12').
225			* @param {!Array\|!TypedArray} samples The samples.
226			* @param {?Object} options Optional. Used to force the container
227			* as RIFX with {'container': 'RIFX'}
228			* @throws {Error} If any argument does not meet the criteria.
229			* @private
230			*/
231			newWavFile_(numChannels, sampleRate, bitDepthCode, samples, options={}) {
232			if (!options.container) {
233			options.container = 'RIFF';
234			}
235			this.container = options.container;
236			this.bitDepth = bitDepthCode;
237			samples = interleave(samples);
238			this.updateDataType_();
239			/** @type {number} */
240			let numBytes = this.dataType.bits / 8;
241			this.data.samples = new Uint8Array(samples.length * numBytes);
242			packArrayTo(samples, this.dataType, this.data.samples);
243			this.makeWavHeader_(
244			bitDepthCode, numChannels, sampleRate,
245			numBytes, this.data.samples.length, options);
246			this.data.chunkId = 'data';
247			this.data.chunkSize = this.data.samples.length;
248			this.validateWavHeader_();
249			}
250
251			/**
252			* Define the header of a wav file.
253			* @param {string} bitDepthCode The audio bit depth
254			* @param {number} numChannels The number of channels
255			* @param {number} sampleRate The sample rate.
256			* @param {number} numBytes The number of bytes each sample use.
257			* @param {number} samplesLength The length of the samples in bytes.
258			* @param {!Object} options The extra options, like container defintion.
259			* @private
260			*/
261			makeWavHeader_(
262			bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options) {
263			if (bitDepthCode == '4') {
264			this.createADPCMHeader_(
265			bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options);
266
267			} else if (bitDepthCode == '8a' \|\| bitDepthCode == '8m') {
268			this.createALawMulawHeader_(
269			bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options);
270
271			} else if(Object.keys(this.WAV_AUDIO_FORMATS).indexOf(bitDepthCode) == -1 \|\|
272			numChannels > 2) {
273			this.createExtensibleHeader_(
274			bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options);
275
276			} else {
277			this.createPCMHeader_(
278			bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options);
279			}
280			}
281
282			/**
283			* Create the header of a linear PCM wave file.
284			* @param {string} bitDepthCode The audio bit depth
285			* @param {number} numChannels The number of channels
286			* @param {number} sampleRate The sample rate.
287			* @param {number} numBytes The number of bytes each sample use.
288			* @param {number} samplesLength The length of the samples in bytes.
289			* @param {!Object} options The extra options, like container defintion.
290			* @private
291			*/
292			createPCMHeader_(
293			bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options) {
294			this.container = options.container;
295			this.chunkSize = 36 + samplesLength;
296			this.format = 'WAVE';
297			this.bitDepth = bitDepthCode;
298			this.fmt = {
299			chunkId: 'fmt ',
300			chunkSize: 16,
301			audioFormat: this.WAV_AUDIO_FORMATS[bitDepthCode] \|\| 65534,
302			numChannels: numChannels,
303			sampleRate: sampleRate,
304			byteRate: (numChannels * numBytes) * sampleRate,
305			blockAlign: numChannels * numBytes,
306			bitsPerSample: parseInt(bitDepthCode, 10),
307			cbSize: 0,
308			validBitsPerSample: 0,
309			dwChannelMask: 0,
310			subformat: []
311			};
312			}
313
314			/**
315			* Create the header of a ADPCM wave file.
316			* @param {string} bitDepthCode The audio bit depth
317			* @param {number} numChannels The number of channels
318			* @param {number} sampleRate The sample rate.
319			* @param {number} numBytes The number of bytes each sample use.
320			* @param {number} samplesLength The length of the samples in bytes.
321			* @param {!Object} options The extra options, like container defintion.
322			* @private
323			*/
324			createADPCMHeader_(
325			bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options) {
326			this.createPCMHeader_(
327			bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options);
328			this.chunkSize = 40 + samplesLength;
329			this.fmt.chunkSize = 20;
330			this.fmt.byteRate = 4055;
331			this.fmt.blockAlign = 256;
332			this.fmt.bitsPerSample = 4;
333			this.fmt.cbSize = 2;
334			this.fmt.validBitsPerSample = 505;
335			this.fact = {
336			chunkId: 'fact',
337			chunkSize: 4,
338			dwSampleLength: samplesLength * 2
339			};
340			}
341
342			/**
343			* Create the header of WAVE_FORMAT_EXTENSIBLE file.
344			* @param {string} bitDepthCode The audio bit depth
345			* @param {number} numChannels The number of channels
346			* @param {number} sampleRate The sample rate.
347			* @param {number} numBytes The number of bytes each sample use.
348			* @param {number} samplesLength The length of the samples in bytes.
349			* @param {!Object} options The extra options, like container defintion.
350			* @private
351			*/
352			createExtensibleHeader_(
353			bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options) {
354			this.createPCMHeader_(
355			bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options);
356			this.chunkSize = 36 + 24 + samplesLength;
357			this.fmt.chunkSize = 40;
358			this.fmt.bitsPerSample = ((parseInt(bitDepthCode, 10) - 1) \| 7) + 1;
359			this.fmt.cbSize = 22;
360			this.fmt.validBitsPerSample = parseInt(bitDepthCode, 10);
361			this.fmt.dwChannelMask = dwChannelMask_(numChannels);
362			// subformat 128-bit GUID as 4 32-bit values
363			// only supports uncompressed integer PCM samples
364			this.fmt.subformat = [1, 1048576, 2852126848, 1905997824];
365			}
366
367			/**
368			* Create the header of mu-Law and A-Law wave files.
369			* @param {string} bitDepthCode The audio bit depth
370			* @param {number} numChannels The number of channels
371			* @param {number} sampleRate The sample rate.
372			* @param {number} numBytes The number of bytes each sample use.
373			* @param {number} samplesLength The length of the samples in bytes.
374			* @param {!Object} options The extra options, like container defintion.
375			* @private
376			*/
377			createALawMulawHeader_(
378			bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options) {
379			this.createPCMHeader_(
380			bitDepthCode, numChannels, sampleRate, numBytes, samplesLength, options);
381			this.chunkSize = 40 + samplesLength;
382			this.fmt.chunkSize = 20;
383			this.fmt.cbSize = 2;
384			this.fmt.validBitsPerSample = 8;
385			this.fact = {
386			chunkId: 'fact',
387			chunkSize: 4,
388			dwSampleLength: samplesLength
389			};
390			}
391
392			/**
393			* Set the string code of the bit depth based on the 'fmt ' chunk.
394			* @private
395			*/
396			bitDepthFromFmt_() {
397			if (this.fmt.audioFormat === 3 && this.fmt.bitsPerSample === 32) {
398			this.bitDepth = '32f';
399			} else if (this.fmt.audioFormat === 6) {
400			this.bitDepth = '8a';
401			} else if (this.fmt.audioFormat === 7) {
402			this.bitDepth = '8m';
403			} else {
404			this.bitDepth = this.fmt.bitsPerSample.toString();
405			}
406			}
407
408			/**
409			* Validate the bit depth.
410			* @return {boolean} True is the bit depth is valid.
411			* @throws {Error} If bit depth is invalid.
412			* @private
413			*/
414			validateBitDepth_() {
415			if (!this.WAV_AUDIO_FORMATS[this.bitDepth]) {
416			if (parseInt(this.bitDepth, 10) > 8 &&
417			parseInt(this.bitDepth, 10) < 54) {
418			return true;
419			}
420			throw new Error('Invalid bit depth.');
421			}
422			return true;
423			}
424
425			/**
426			* Update the type definition used to read and write the samples.
427			* @private
428			*/
429			updateDataType_() {
430			this.dataType = {
431			bits: ((parseInt(this.bitDepth, 10) - 1) \| 7) + 1,
432			fp: this.bitDepth == '32f' \|\| this.bitDepth == '64',
433			signed: this.bitDepth != '8',
434			be: this.container == 'RIFX'
435			};
436			if (['4', '8a', '8m'].indexOf(this.bitDepth) > -1 ) {
437			this.dataType.bits = 8;
438			this.dataType.signed = false;
439			}
440			}
441
442			/**
443			* Validate the header of the file.
444			* @throws {Error} If bit depth is invalid.
445			* @throws {Error} If the number of channels is invalid.
446			* @throws {Error} If the sample rate is invalid.
447			* @ignore
448			* @private
449			*/
450			validateWavHeader_() {
451			this.validateBitDepth_();
452			if (!validateNumChannels(this.fmt.numChannels, this.fmt.bitsPerSample)) {
453			throw new Error('Invalid number of channels.');
454			}
455			if (!validateSampleRate(
456			this.fmt.numChannels, this.fmt.bitsPerSample, this.fmt.sampleRate)) {
457			throw new Error('Invalid sample rate.');
458			}
459			}
460			}
461
462			/**
463			* Return the value for dwChannelMask according to the number of channels.
464			* @param {number} numChannels the number of channels.
465			* @return {number} the dwChannelMask value.
466			* @private
467			*/
468			function dwChannelMask_(numChannels) {
469			/** @type {number} */
470			let mask = 0;
471			// mono = FC
472			if (numChannels === 1) {
473			mask = 0x4;
474			// stereo = FL, FR
475			} else if (numChannels === 2) {
476			mask = 0x3;
477			// quad = FL, FR, BL, BR
478			} else if (numChannels === 4) {
479			mask = 0x33;
480			// 5.1 = FL, FR, FC, LF, BL, BR
481			} else if (numChannels === 6) {
482			mask = 0x3F;
483			// 7.1 = FL, FR, FC, LF, BL, BR, SL, SR
484			} else if (numChannels === 8) {
485			mask = 0x63F;
486			}
487			return mask;
488			}
489

rochars / wavefile

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wavefile-creator.js ➔ dwChannelMask_ B

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