WaveFileConverter.toSampleRate - Code Metrics - Inspection of "Add ADPCM chirp test" - rochars/wavefile - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Branch — v11-no-dependencies (fcadbf)

by Rafael S.

created 2020-01-30 02:01 UTC

WaveFileConverter.toSampleRate A

↳ Parent: WaveFileConverter

Complexity

Conditions

Size

Total Lines	21
Code Lines	13

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	3
eloc	13
dl	0
loc	21
rs	9.75
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 WaveFileConverter class.
 * @see https://github.com/rochars/wavefile
 */

import { changeBitDepth } from './codecs/bitdepth';
import { encode as encodeIMAADPCM,

  decode as decodeIMAADPCM} from './codecs/imaadpcm';

import {encode as encodeALaw, decode as decodeALaw} from './codecs/alaw';

import {encode as encodeMuLaw, decode as decodeMuLaw} from './codecs/mulaw';
import { unpackArrayTo } from './parsers/binary';
import { WaveFileCueEditor } from './wavefile-cue-editor';
import { validateSampleRate } from './validators/validate-sample-rate';
import { resample } from './resampler';

/**
 * A class to convert wav files to other types of wav files.
 * @extends WaveFileCueEditor
 * @ignore
 */
export class WaveFileConverter extends WaveFileCueEditor {

  /**
   * Force a file as RIFF.
   */
  toRIFF() {
    /** @type {!Float64Array} */
    let output = new Float64Array(
      outputSize_(this.data.samples.length, this.dataType.bits / 8));
    unpackArrayTo(this.data.samples, this.dataType, output,
      0, this.data.samples.length);
    this.fromExisting_(
      this.fmt.numChannels,
      this.fmt.sampleRate,
      this.bitDepth,
      output,
      {container: 'RIFF'});
  }

  /**
   * Force a file as RIFX.
   */
  toRIFX() {
    /** @type {!Float64Array} */
    let output = new Float64Array(
      outputSize_(this.data.samples.length, this.dataType.bits / 8));
    unpackArrayTo(this.data.samples, this.dataType, output,
      0, this.data.samples.length);
    this.fromExisting_(
      this.fmt.numChannels,
      this.fmt.sampleRate,
      this.bitDepth,
      output,
      {container: 'RIFX'});
  }

  /**
   * Encode a 16-bit wave file as 4-bit IMA ADPCM.
   * @throws {Error} If sample rate is not 8000.
   * @throws {Error} If number of channels is not 1.
   */
  toIMAADPCM() {
    if (this.fmt.sampleRate !== 8000) {
      throw new Error(
        'Only 8000 Hz files can be compressed as IMA-ADPCM.');
    } else if (this.fmt.numChannels !== 1) {
      throw new Error(
        'Only mono files can be compressed as IMA-ADPCM.');
    } else {
      this.assure16Bit_();
      /** @type {!Int16Array} */
      let output = new Int16Array(
        outputSize_(this.data.samples.length, 2));
      unpackArrayTo(this.data.samples, this.dataType, output,
        0, this.data.samples.length);
      this.fromExisting_(
        this.fmt.numChannels,
        this.fmt.sampleRate,
        '4',
        encodeIMAADPCM(output),
        {container: this.correctContainer_()});
    }
  }

  /**
   * Decode a 4-bit IMA ADPCM wave file as a 16-bit wave file.
   * @param {string=} [bitDepthCode='16'] The new bit depth of the samples.
   *    One of '8' ... '32' (integers), '32f' or '64' (floats).
   */
  fromIMAADPCM(bitDepthCode='16') {
    this.fromExisting_(
      this.fmt.numChannels,
      this.fmt.sampleRate,
      '16',
      decodeIMAADPCM(this.data.samples, this.fmt.blockAlign),
      {container: this.correctContainer_()});
    if (bitDepthCode != '16') {
      this.toBitDepth(bitDepthCode);
    }
  }

  /**
   * Encode a 16-bit wave file as 8-bit A-Law.
   */
  toALaw() {
    this.assure16Bit_();
    /** @type {!Int16Array} */
    let output = new Int16Array(
      outputSize_(this.data.samples.length, 2));
    unpackArrayTo(this.data.samples, this.dataType, output,
        0, this.data.samples.length);
    this.fromExisting_(
      this.fmt.numChannels,
      this.fmt.sampleRate,
      '8a',
      encodeALaw(output),
      {container: this.correctContainer_()});
  }

  /**
   * Decode a 8-bit A-Law wave file into a 16-bit wave file.
   * @param {string=} [bitDepthCode='16'] The new bit depth of the samples.
   *    One of '8' ... '32' (integers), '32f' or '64' (floats).
   */
  fromALaw(bitDepthCode='16') {
    this.fromExisting_(
      this.fmt.numChannels,
      this.fmt.sampleRate,
      '16',
      decodeALaw(this.data.samples),
      {container: this.correctContainer_()});
    if (bitDepthCode != '16') {
      this.toBitDepth(bitDepthCode);
    }
  }

  /**
   * Encode 16-bit wave file as 8-bit mu-Law.
   */
  toMuLaw() {
    this.assure16Bit_();
    /** @type {!Int16Array} */
    let output = new Int16Array(
      outputSize_(this.data.samples.length, 2));
    unpackArrayTo(this.data.samples, this.dataType, output,
        0, this.data.samples.length);
    this.fromExisting_(
      this.fmt.numChannels,
      this.fmt.sampleRate,
      '8m',
      encodeMuLaw(output),
      {container: this.correctContainer_()});
  }

  /**
   * Decode a 8-bit mu-Law wave file into a 16-bit wave file.
   * @param {string=} [bitDepthCode='16'] The new bit depth of the samples.
   *    One of '8' ... '32' (integers), '32f' or '64' (floats).
   */
  fromMuLaw(bitDepthCode='16') {
    this.fromExisting_(
      this.fmt.numChannels,
      this.fmt.sampleRate,
      '16',
      decodeMuLaw(this.data.samples),
      {container: this.correctContainer_()});
    if (bitDepthCode != '16') {
      this.toBitDepth(bitDepthCode);
    }
  }

  /**
   * Change the bit depth of the samples.
   * @param {string} newBitDepth The new bit depth of the samples.
   *    One of '8' ... '32' (integers), '32f' or '64' (floats)
   * @param {boolean=} [changeResolution=true] A boolean indicating if the
   *    resolution of samples should be actually changed or not.
   * @throws {Error} If the bit depth is not valid.
   */
  toBitDepth(newBitDepth, changeResolution=true) {
    /** @type {string} */
    let toBitDepth = newBitDepth;
    /** @type {string} */
    let thisBitDepth = this.bitDepth;
    if (!changeResolution) {
      if (newBitDepth != '32f') {
        toBitDepth = this.dataType.bits.toString();
      }
      thisBitDepth = '' + this.dataType.bits;
    }
    // If the file is compressed, make it
    // PCM before changing the bit depth
    this.assureUncompressed_();
    /**
     * The original samples, interleaved.
     * @type {!(Array|TypedArray)}
     */
    let samples = this.getSamples(true);
    /**
     * The container for the new samples.
     * @type {!Float64Array}
     */
    let newSamples = new Float64Array(samples.length);
    // Change the bit depth
    changeBitDepth(samples, thisBitDepth, newSamples, toBitDepth);
    // Re-create the file
    this.fromExisting_(
      this.fmt.numChannels,
      this.fmt.sampleRate,
      newBitDepth,
      newSamples,
      {container: this.correctContainer_()});
  }

  /**
   * Convert the sample rate of the file.
   * @param {number} sampleRate The target sample rate.
   * @param {Object=} options The extra configuration, if needed.
   */
  toSampleRate(sampleRate, options) {
    this.validateResample_(sampleRate);
    /** @type {!(Array|TypedArray)} */
    let samples = this.getSamples();
    /** @type {!(Array|Float64Array)} */
    let newSamples = [];
    // Mono files
    if (samples.constructor === Float64Array) {
      newSamples = resample(samples, this.fmt.sampleRate, sampleRate, options);
    // Multi-channel files
    } else {
      for (let i = 0; i < samples.length; i++) {
        newSamples.push(resample(
          samples[i], this.fmt.sampleRate, sampleRate, options));
      }
    }
    // Recreate the file
    this.fromExisting_(
      this.fmt.numChannels, sampleRate, this.bitDepth, newSamples,
      {'container': this.correctContainer_()});
  }

  /**
   * Validate the conditions for resampling.
   * @param {number} sampleRate The target sample rate.
   * @throws {Error} If the file cant be resampled.
   * @private
   */
  validateResample_(sampleRate) {
    if (!validateSampleRate(
        this.fmt.numChannels, this.fmt.bitsPerSample, sampleRate)) {
      throw new Error('Invalid sample rate.');
    } else if (['4','8a','8m'].indexOf(this.bitDepth) > -1) {
      throw new Error(
        'wavefile can\'t change the sample rate of compressed files.');
    }
  }

  /**
   * Make the file 16-bit if it is not.
   * @private
   */
  assure16Bit_() {
    this.assureUncompressed_();
    if (this.bitDepth != '16') {
      this.toBitDepth('16');
    }
  }

  /**
   * Uncompress the samples in case of a compressed file.
   * @private
   */
  assureUncompressed_() {
    if (this.bitDepth == '8a') {
      this.fromALaw();
    } else if (this.bitDepth == '8m') {
      this.fromMuLaw();
    } else if (this.bitDepth == '4') {
      this.fromIMAADPCM();
    }
  }

  /**
   * Return 'RIFF' if the container is 'RF64', the current container name
   * otherwise. Used to enforce 'RIFF' when RF64 is not allowed.
   * @return {string}
   * @private
   */
  correctContainer_() {
    return this.container == 'RF64' ? 'RIFF' : this.container;
  }

  /**
   * Set up the WaveFileCreator object based on the arguments passed.
   * This method only reset the fmt , fact, ds64 and data chunks.
   * @param {number} numChannels The number of channels
   *    (Integer numbers: 1 for mono, 2 stereo and so on).
   * @param {number} sampleRate The sample rate.
   *    Integer numbers 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. Must be in the correct range according to the bit depth.
   * @param {Object} options Used to define the container. Uses RIFF by default.
   * @throws {Error} If any argument does not meet the criteria.
   * @private
   */
  fromExisting_(numChannels, sampleRate, bitDepthCode, samples, options) {
    /** @type {!Object} */
    let tmpWav = new WaveFileCueEditor();
    Object.assign(this.fmt, tmpWav.fmt);
    Object.assign(this.fact, tmpWav.fact);
    Object.assign(this.ds64, tmpWav.ds64);
    Object.assign(this.data, tmpWav.data);
    this.newWavFile_(numChannels, sampleRate, bitDepthCode, samples, options);
  }
}

/**
 * Return the size in bytes of the output sample array when applying
 * compression to 16-bit samples.
 * @return {number}
 * @private
 */
function outputSize_(byteLen, byteOffset) {
  /** @type {number} */
  let outputSize = byteLen / byteOffset;
  if (outputSize % 2) {
    outputSize++;
  }
  return outputSize;
}


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 WaveFileConverter class.
27			* @see https://github.com/rochars/wavefile
28			*/
29
30			import { changeBitDepth } from './codecs/bitdepth';
31			import { encode as encodeIMAADPCM,
			0 ignored issues – show Unused Code introduced 2020-01-30 02:08 UTC by Report Bug Copy Issue Report The variable `encode` seems to be never used. Consider removing it. Loading history...
32			decode as decodeIMAADPCM} from './codecs/imaadpcm';
			0 ignored issues – show Unused Code introduced 2020-01-30 02:08 UTC by Report Bug Copy Issue Report The variable `decode` seems to be never used. Consider removing it. Loading history...
33			import {encode as encodeALaw, decode as decodeALaw} from './codecs/alaw';
			0 ignored issues – show introduced 2020-01-30 02:08 UTC by Report Bug Copy Issue Report The variable `encode` already seems to be declared on line `31`. Are you sure you want to import using `encode` as name? Loading history... introduced 2020-01-30 02:08 UTC by Report Bug Copy Issue Report The variable `decode` already seems to be declared on line `32`. Are you sure you want to import using `decode` as name? Loading history...
34			import {encode as encodeMuLaw, decode as decodeMuLaw} from './codecs/mulaw';
35			import { unpackArrayTo } from './parsers/binary';
36			import { WaveFileCueEditor } from './wavefile-cue-editor';
37			import { validateSampleRate } from './validators/validate-sample-rate';
38			import { resample } from './resampler';
39
40			/**
41			* A class to convert wav files to other types of wav files.
42			* @extends WaveFileCueEditor
43			* @ignore
44			*/
45			export class WaveFileConverter extends WaveFileCueEditor {
46
47			/**
48			* Force a file as RIFF.
49			*/
50			toRIFF() {
51			/** @type {!Float64Array} */
52			let output = new Float64Array(
53			outputSize_(this.data.samples.length, this.dataType.bits / 8));
54			unpackArrayTo(this.data.samples, this.dataType, output,
55			0, this.data.samples.length);
56			this.fromExisting_(
57			this.fmt.numChannels,
58			this.fmt.sampleRate,
59			this.bitDepth,
60			output,
61			{container: 'RIFF'});
62			}
63
64			/**
65			* Force a file as RIFX.
66			*/
67			toRIFX() {
68			/** @type {!Float64Array} */
69			let output = new Float64Array(
70			outputSize_(this.data.samples.length, this.dataType.bits / 8));
71			unpackArrayTo(this.data.samples, this.dataType, output,
72			0, this.data.samples.length);
73			this.fromExisting_(
74			this.fmt.numChannels,
75			this.fmt.sampleRate,
76			this.bitDepth,
77			output,
78			{container: 'RIFX'});
79			}
80
81			/**
82			* Encode a 16-bit wave file as 4-bit IMA ADPCM.
83			* @throws {Error} If sample rate is not 8000.
84			* @throws {Error} If number of channels is not 1.
85			*/
86			toIMAADPCM() {
87			if (this.fmt.sampleRate !== 8000) {
88			throw new Error(
89			'Only 8000 Hz files can be compressed as IMA-ADPCM.');
90			} else if (this.fmt.numChannels !== 1) {
91			throw new Error(
92			'Only mono files can be compressed as IMA-ADPCM.');
93			} else {
94			this.assure16Bit_();
95			/** @type {!Int16Array} */
96			let output = new Int16Array(
97			outputSize_(this.data.samples.length, 2));
98			unpackArrayTo(this.data.samples, this.dataType, output,
99			0, this.data.samples.length);
100			this.fromExisting_(
101			this.fmt.numChannels,
102			this.fmt.sampleRate,
103			'4',
104			encodeIMAADPCM(output),
105			{container: this.correctContainer_()});
106			}
107			}
108
109			/**
110			* Decode a 4-bit IMA ADPCM wave file as a 16-bit wave file.
111			* @param {string=} [bitDepthCode='16'] The new bit depth of the samples.
112			* One of '8' ... '32' (integers), '32f' or '64' (floats).
113			*/
114			fromIMAADPCM(bitDepthCode='16') {
115			this.fromExisting_(
116			this.fmt.numChannels,
117			this.fmt.sampleRate,
118			'16',
119			decodeIMAADPCM(this.data.samples, this.fmt.blockAlign),
120			{container: this.correctContainer_()});
121			if (bitDepthCode != '16') {
122			this.toBitDepth(bitDepthCode);
123			}
124			}
125
126			/**
127			* Encode a 16-bit wave file as 8-bit A-Law.
128			*/
129			toALaw() {
130			this.assure16Bit_();
131			/** @type {!Int16Array} */
132			let output = new Int16Array(
133			outputSize_(this.data.samples.length, 2));
134			unpackArrayTo(this.data.samples, this.dataType, output,
135			0, this.data.samples.length);
136			this.fromExisting_(
137			this.fmt.numChannels,
138			this.fmt.sampleRate,
139			'8a',
140			encodeALaw(output),
141			{container: this.correctContainer_()});
142			}
143
144			/**
145			* Decode a 8-bit A-Law wave file into a 16-bit wave file.
146			* @param {string=} [bitDepthCode='16'] The new bit depth of the samples.
147			* One of '8' ... '32' (integers), '32f' or '64' (floats).
148			*/
149			fromALaw(bitDepthCode='16') {
150			this.fromExisting_(
151			this.fmt.numChannels,
152			this.fmt.sampleRate,
153			'16',
154			decodeALaw(this.data.samples),
155			{container: this.correctContainer_()});
156			if (bitDepthCode != '16') {
157			this.toBitDepth(bitDepthCode);
158			}
159			}
160
161			/**
162			* Encode 16-bit wave file as 8-bit mu-Law.
163			*/
164			toMuLaw() {
165			this.assure16Bit_();
166			/** @type {!Int16Array} */
167			let output = new Int16Array(
168			outputSize_(this.data.samples.length, 2));
169			unpackArrayTo(this.data.samples, this.dataType, output,
170			0, this.data.samples.length);
171			this.fromExisting_(
172			this.fmt.numChannels,
173			this.fmt.sampleRate,
174			'8m',
175			encodeMuLaw(output),
176			{container: this.correctContainer_()});
177			}
178
179			/**
180			* Decode a 8-bit mu-Law wave file into a 16-bit wave file.
181			* @param {string=} [bitDepthCode='16'] The new bit depth of the samples.
182			* One of '8' ... '32' (integers), '32f' or '64' (floats).
183			*/
184			fromMuLaw(bitDepthCode='16') {
185			this.fromExisting_(
186			this.fmt.numChannels,
187			this.fmt.sampleRate,
188			'16',
189			decodeMuLaw(this.data.samples),
190			{container: this.correctContainer_()});
191			if (bitDepthCode != '16') {
192			this.toBitDepth(bitDepthCode);
193			}
194			}
195
196			/**
197			* Change the bit depth of the samples.
198			* @param {string} newBitDepth The new bit depth of the samples.
199			* One of '8' ... '32' (integers), '32f' or '64' (floats)
200			* @param {boolean=} [changeResolution=true] A boolean indicating if the
201			* resolution of samples should be actually changed or not.
202			* @throws {Error} If the bit depth is not valid.
203			*/
204			toBitDepth(newBitDepth, changeResolution=true) {
205			/** @type {string} */
206			let toBitDepth = newBitDepth;
207			/** @type {string} */
208			let thisBitDepth = this.bitDepth;
209			if (!changeResolution) {
210			if (newBitDepth != '32f') {
211			toBitDepth = this.dataType.bits.toString();
212			}
213			thisBitDepth = '' + this.dataType.bits;
214			}
215			// If the file is compressed, make it
216			// PCM before changing the bit depth
217			this.assureUncompressed_();
218			/**
219			* The original samples, interleaved.
220			* @type {!(Array\|TypedArray)}
221			*/
222			let samples = this.getSamples(true);
223			/**
224			* The container for the new samples.
225			* @type {!Float64Array}
226			*/
227			let newSamples = new Float64Array(samples.length);
228			// Change the bit depth
229			changeBitDepth(samples, thisBitDepth, newSamples, toBitDepth);
230			// Re-create the file
231			this.fromExisting_(
232			this.fmt.numChannels,
233			this.fmt.sampleRate,
234			newBitDepth,
235			newSamples,
236			{container: this.correctContainer_()});
237			}
238
239			/**
240			* Convert the sample rate of the file.
241			* @param {number} sampleRate The target sample rate.
242			* @param {Object=} options The extra configuration, if needed.
243			*/
244			toSampleRate(sampleRate, options) {
245			this.validateResample_(sampleRate);
246			/** @type {!(Array\|TypedArray)} */
247			let samples = this.getSamples();
248			/** @type {!(Array\|Float64Array)} */
249			let newSamples = [];
250			// Mono files
251			if (samples.constructor === Float64Array) {
252			newSamples = resample(samples, this.fmt.sampleRate, sampleRate, options);
253			// Multi-channel files
254			} else {
255			for (let i = 0; i < samples.length; i++) {
256			newSamples.push(resample(
257			samples[i], this.fmt.sampleRate, sampleRate, options));
258			}
259			}
260			// Recreate the file
261			this.fromExisting_(
262			this.fmt.numChannels, sampleRate, this.bitDepth, newSamples,
263			{'container': this.correctContainer_()});
264			}
265
266			/**
267			* Validate the conditions for resampling.
268			* @param {number} sampleRate The target sample rate.
269			* @throws {Error} If the file cant be resampled.
270			* @private
271			*/
272			validateResample_(sampleRate) {
273			if (!validateSampleRate(
274			this.fmt.numChannels, this.fmt.bitsPerSample, sampleRate)) {
275			throw new Error('Invalid sample rate.');
276			} else if (['4','8a','8m'].indexOf(this.bitDepth) > -1) {
277			throw new Error(
278			'wavefile can\'t change the sample rate of compressed files.');
279			}
280			}
281
282			/**
283			* Make the file 16-bit if it is not.
284			* @private
285			*/
286			assure16Bit_() {
287			this.assureUncompressed_();
288			if (this.bitDepth != '16') {
289			this.toBitDepth('16');
290			}
291			}
292
293			/**
294			* Uncompress the samples in case of a compressed file.
295			* @private
296			*/
297			assureUncompressed_() {
298			if (this.bitDepth == '8a') {
299			this.fromALaw();
300			} else if (this.bitDepth == '8m') {
301			this.fromMuLaw();
302			} else if (this.bitDepth == '4') {
303			this.fromIMAADPCM();
304			}
305			}
306
307			/**
308			* Return 'RIFF' if the container is 'RF64', the current container name
309			* otherwise. Used to enforce 'RIFF' when RF64 is not allowed.
310			* @return {string}
311			* @private
312			*/
313			correctContainer_() {
314			return this.container == 'RF64' ? 'RIFF' : this.container;
315			}
316
317			/**
318			* Set up the WaveFileCreator object based on the arguments passed.
319			* This method only reset the fmt , fact, ds64 and data chunks.
320			* @param {number} numChannels The number of channels
321			* (Integer numbers: 1 for mono, 2 stereo and so on).
322			* @param {number} sampleRate The sample rate.
323			* Integer numbers like 8000, 44100, 48000, 96000, 192000.
324			* @param {string} bitDepthCode The audio bit depth code.
325			* One of '4', '8', '8a', '8m', '16', '24', '32', '32f', '64'
326			* or any value between '8' and '32' (like '12').
327			* @param {!(Array\|TypedArray)} samples
328			* The samples. Must be in the correct range according to the bit depth.
329			* @param {Object} options Used to define the container. Uses RIFF by default.
330			* @throws {Error} If any argument does not meet the criteria.
331			* @private
332			*/
333			fromExisting_(numChannels, sampleRate, bitDepthCode, samples, options) {
334			/** @type {!Object} */
335			let tmpWav = new WaveFileCueEditor();
336			Object.assign(this.fmt, tmpWav.fmt);
337			Object.assign(this.fact, tmpWav.fact);
338			Object.assign(this.ds64, tmpWav.ds64);
339			Object.assign(this.data, tmpWav.data);
340			this.newWavFile_(numChannels, sampleRate, bitDepthCode, samples, options);
341			}
342			}
343
344			/**
345			* Return the size in bytes of the output sample array when applying
346			* compression to 16-bit samples.
347			* @return {number}
348			* @private
349			*/
350			function outputSize_(byteLen, byteOffset) {
351			/** @type {number} */
352			let outputSize = byteLen / byteOffset;
353			if (outputSize % 2) {
354			outputSize++;
355			}
356			return outputSize;
357			}
358

rochars / wavefile

Branch — v11-no-dependencies (fcadbf)

WaveFileConverter.toSampleRate A

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