WaveFileConverter.assureUncompressed_ - 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

WaveFileConverter.assureUncompressed_ A

↳ Parent: WaveFileConverter

Complexity

Conditions

Size

Total Lines	9
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
eloc	7
dl	0
loc	9
rs	10
c	0
b	0
f	0
cc	4

/*
 * 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 'bitdepth';
import * as imaadpcm from 'imaadpcm';
import * as alawmulaw from 'alawmulaw';
import { unpackArray, unpackArrayTo } from 'byte-data';
import { WaveFileMetaEditor } from './wavefile-meta-editor';
import { truncateIntSamples } from './parsers/truncate-samples';
import { validateSampleRate } from './validators/validate-sample-rate';
import { resample } from './resampler';

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

  /**
   * Force a file as RIFF.
   */
  toRIFF() {
    this.fromExisting_(
      this.fmt.numChannels,
      this.fmt.sampleRate,
      this.bitDepth,
      unpackArray(this.data.samples, this.dataType));
  }

  /**
   * Force a file as RIFX.
   */
  toRIFX() {
    this.fromExisting_(
      this.fmt.numChannels,
      this.fmt.sampleRate,
      this.bitDepth,
      unpackArray(this.data.samples, this.dataType),
      {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(this.outputSize_());
      unpackArrayTo(this.data.samples, this.dataType, output);
      this.fromExisting_(
        this.fmt.numChannels,
        this.fmt.sampleRate,
        '4',
        imaadpcm.encode(output),
        {container: this.correctContainer_()});
    }
  }

  /**
   * Decode a 4-bit IMA ADPCM wave file as a 16-bit wave file.
   * @param {string} bitDepthCode The new bit depth of the samples.
   *    One of '8' ... '32' (integers), '32f' or '64' (floats).
   *    Optional. Default is 16.
   */
  fromIMAADPCM(bitDepthCode='16') {
    this.fromExisting_(
      this.fmt.numChannels,
      this.fmt.sampleRate,
      '16',
      imaadpcm.decode(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(this.outputSize_());
    unpackArrayTo(this.data.samples, this.dataType, output);
    this.fromExisting_(
      this.fmt.numChannels,
      this.fmt.sampleRate,
      '8a',
      alawmulaw.alaw.encode(output),
      {container: this.correctContainer_()});
  }

  /**
   * Decode a 8-bit A-Law wave file into a 16-bit wave file.
   * @param {string} bitDepthCode The new bit depth of the samples.
   *    One of '8' ... '32' (integers), '32f' or '64' (floats).
   *    Optional. Default is 16.
   */
  fromALaw(bitDepthCode='16') {
    this.fromExisting_(
      this.fmt.numChannels,
      this.fmt.sampleRate,
      '16',
      alawmulaw.alaw.decode(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(this.outputSize_());
    unpackArrayTo(this.data.samples, this.dataType, output);
    this.fromExisting_(
      this.fmt.numChannels,
      this.fmt.sampleRate,
      '8m',
      alawmulaw.mulaw.encode(output),
      {container: this.correctContainer_()});
  }

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

rochars / wavefile

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WaveFileConverter.assureUncompressed_ A

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