WaveFileConverter.toSampleRate - Code Metrics - Inspection of "Update docs with v11.0" - rochars/wavefile - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( 13b350...038bd4 )

by Rafael S.

created 2020-01-30 04:04 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 * as imaadpcm from './codecs/imaadpcm';
import * as alaw from './codecs/alaw';
import * as mulaw 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',
        imaadpcm.encode(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',
      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(
      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',
      alaw.encode(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',
      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(
      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',
      mulaw.encode(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',
      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=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 * as imaadpcm from './codecs/imaadpcm';
32			import * as alaw from './codecs/alaw';
33			import * as mulaw from './codecs/mulaw';
34			import { unpackArrayTo } from './parsers/binary';
35			import { WaveFileCueEditor } from './wavefile-cue-editor';
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 WaveFileCueEditor
42			* @ignore
43			*/
44			export class WaveFileConverter extends WaveFileCueEditor {
45
46			/**
47			* Force a file as RIFF.
48			*/
49			toRIFF() {
50			/** @type {!Float64Array} */
51			let output = new Float64Array(
52			outputSize_(this.data.samples.length, this.dataType.bits / 8));
53			unpackArrayTo(this.data.samples, this.dataType, output,
54			0, this.data.samples.length);
55			this.fromExisting_(
56			this.fmt.numChannels,
57			this.fmt.sampleRate,
58			this.bitDepth,
59			output,
60			{container: 'RIFF'});
61			}
62
63			/**
64			* Force a file as RIFX.
65			*/
66			toRIFX() {
67			/** @type {!Float64Array} */
68			let output = new Float64Array(
69			outputSize_(this.data.samples.length, this.dataType.bits / 8));
70			unpackArrayTo(this.data.samples, this.dataType, output,
71			0, this.data.samples.length);
72			this.fromExisting_(
73			this.fmt.numChannels,
74			this.fmt.sampleRate,
75			this.bitDepth,
76			output,
77			{container: 'RIFX'});
78			}
79
80			/**
81			* Encode a 16-bit wave file as 4-bit IMA ADPCM.
82			* @throws {Error} If sample rate is not 8000.
83			* @throws {Error} If number of channels is not 1.
84			*/
85			toIMAADPCM() {
86			if (this.fmt.sampleRate !== 8000) {
87			throw new Error(
88			'Only 8000 Hz files can be compressed as IMA-ADPCM.');
89			} else if (this.fmt.numChannels !== 1) {
90			throw new Error(
91			'Only mono files can be compressed as IMA-ADPCM.');
92			} else {
93			this.assure16Bit_();
94			/** @type {!Int16Array} */
95			let output = new Int16Array(
96			outputSize_(this.data.samples.length, 2));
97			unpackArrayTo(this.data.samples, this.dataType, output,
98			0, this.data.samples.length);
99			this.fromExisting_(
100			this.fmt.numChannels,
101			this.fmt.sampleRate,
102			'4',
103			imaadpcm.encode(output),
104			{container: this.correctContainer_()});
105			}
106			}
107
108			/**
109			* Decode a 4-bit IMA ADPCM wave file as a 16-bit wave file.
110			* @param {string=} [bitDepthCode='16'] The new bit depth of the samples.
111			* One of '8' ... '32' (integers), '32f' or '64' (floats).
112			*/
113			fromIMAADPCM(bitDepthCode='16') {
114			this.fromExisting_(
115			this.fmt.numChannels,
116			this.fmt.sampleRate,
117			'16',
118			imaadpcm.decode(this.data.samples, this.fmt.blockAlign),
119			{container: this.correctContainer_()});
120			if (bitDepthCode != '16') {
121			this.toBitDepth(bitDepthCode);
122			}
123			}
124
125			/**
126			* Encode a 16-bit wave file as 8-bit A-Law.
127			*/
128			toALaw() {
129			this.assure16Bit_();
130			/** @type {!Int16Array} */
131			let output = new Int16Array(
132			outputSize_(this.data.samples.length, 2));
133			unpackArrayTo(this.data.samples, this.dataType, output,
134			0, this.data.samples.length);
135			this.fromExisting_(
136			this.fmt.numChannels,
137			this.fmt.sampleRate,
138			'8a',
139			alaw.encode(output),
140			{container: this.correctContainer_()});
141			}
142
143			/**
144			* Decode a 8-bit A-Law wave file into a 16-bit wave file.
145			* @param {string=} [bitDepthCode='16'] The new bit depth of the samples.
146			* One of '8' ... '32' (integers), '32f' or '64' (floats).
147			*/
148			fromALaw(bitDepthCode='16') {
149			this.fromExisting_(
150			this.fmt.numChannels,
151			this.fmt.sampleRate,
152			'16',
153			alaw.decode(this.data.samples),
154			{container: this.correctContainer_()});
155			if (bitDepthCode != '16') {
156			this.toBitDepth(bitDepthCode);
157			}
158			}
159
160			/**
161			* Encode 16-bit wave file as 8-bit mu-Law.
162			*/
163			toMuLaw() {
164			this.assure16Bit_();
165			/** @type {!Int16Array} */
166			let output = new Int16Array(
167			outputSize_(this.data.samples.length, 2));
168			unpackArrayTo(this.data.samples, this.dataType, output,
169			0, this.data.samples.length);
170			this.fromExisting_(
171			this.fmt.numChannels,
172			this.fmt.sampleRate,
173			'8m',
174			mulaw.encode(output),
175			{container: this.correctContainer_()});
176			}
177
178			/**
179			* Decode a 8-bit mu-Law wave file into a 16-bit wave file.
180			* @param {string=} [bitDepthCode='16'] The new bit depth of the samples.
181			* One of '8' ... '32' (integers), '32f' or '64' (floats).
182			*/
183			fromMuLaw(bitDepthCode='16') {
184			this.fromExisting_(
185			this.fmt.numChannels,
186			this.fmt.sampleRate,
187			'16',
188			mulaw.decode(this.data.samples),
189			{container: this.correctContainer_()});
190			if (bitDepthCode != '16') {
191			this.toBitDepth(bitDepthCode);
192			}
193			}
194
195			/**
196			* Change the bit depth of the samples.
197			* @param {string} newBitDepth The new bit depth of the samples.
198			* One of '8' ... '32' (integers), '32f' or '64' (floats)
199			* @param {boolean=} [changeResolution=true] A boolean indicating if the
200			* resolution of samples should be actually changed or not.
201			* @throws {Error} If the bit depth is not valid.
202			*/
203			toBitDepth(newBitDepth, changeResolution=true) {
204			/** @type {string} */
205			let toBitDepth = newBitDepth;
206			/** @type {string} */
207			let thisBitDepth = this.bitDepth;
208			if (!changeResolution) {
209			if (newBitDepth != '32f') {
210			toBitDepth = this.dataType.bits.toString();
211			}
212			thisBitDepth = '' + this.dataType.bits;
213			}
214			// If the file is compressed, make it
215			// PCM before changing the bit depth
216			this.assureUncompressed_();
217			/**
218			* The original samples, interleaved.
219			* @type {!(Array\|TypedArray)}
220			*/
221			let samples = this.getSamples(true);
222			/**
223			* The container for the new samples.
224			* @type {!Float64Array}
225			*/
226			let newSamples = new Float64Array(samples.length);
227			// Change the bit depth
228			changeBitDepth(samples, thisBitDepth, newSamples, toBitDepth);
229			// Re-create the file
230			this.fromExisting_(
231			this.fmt.numChannels,
232			this.fmt.sampleRate,
233			newBitDepth,
234			newSamples,
235			{container: this.correctContainer_()});
236			}
237
238			/**
239			* Convert the sample rate of the file.
240			* @param {number} sampleRate The target sample rate.
241			* @param {Object=} options The extra configuration, if needed.
242			*/
243			toSampleRate(sampleRate, options) {
244			this.validateResample_(sampleRate);
245			/** @type {!(Array\|TypedArray)} */
246			let samples = this.getSamples();
247			/** @type {!(Array\|Float64Array)} */
248			let newSamples = [];
249			// Mono files
250			if (samples.constructor === Float64Array) {
251			newSamples = resample(samples, this.fmt.sampleRate, sampleRate, options);
252			// Multi-channel files
253			} else {
254			for (let i = 0; i < samples.length; i++) {
			0 ignored issues – show Complexity Coding Style introduced 2020-01-30 04:08 UTC by Report Bug Copy Issue Report You seem to be assigning a new value to the loop variable `i` here. Please check if this was indeed your intention. Even if it was, consider using another kind of loop instead. Loading history...
255			newSamples.push(resample(
256			samples[i], this.fmt.sampleRate, sampleRate, options));
257			}
258			}
259			// Recreate the file
260			this.fromExisting_(
261			this.fmt.numChannels, sampleRate, this.bitDepth, newSamples,
262			{'container': this.correctContainer_()});
263			}
264
265			/**
266			* Validate the conditions for resampling.
267			* @param {number} sampleRate The target sample rate.
268			* @throws {Error} If the file cant be resampled.
269			* @private
270			*/
271			validateResample_(sampleRate) {
272			if (!validateSampleRate(
273			this.fmt.numChannels, this.fmt.bitsPerSample, sampleRate)) {
274			throw new Error('Invalid sample rate.');
275			} else if (['4','8a','8m'].indexOf(this.bitDepth) > -1) {
276			throw new Error(
277			'wavefile can\'t change the sample rate of compressed files.');
278			}
279			}
280
281			/**
282			* Make the file 16-bit if it is not.
283			* @private
284			*/
285			assure16Bit_() {
286			this.assureUncompressed_();
287			if (this.bitDepth != '16') {
288			this.toBitDepth('16');
289			}
290			}
291
292			/**
293			* Uncompress the samples in case of a compressed file.
294			* @private
295			*/
296			assureUncompressed_() {
297			if (this.bitDepth == '8a') {
298			this.fromALaw();
299			} else if (this.bitDepth == '8m') {
300			this.fromMuLaw();
301			} else if (this.bitDepth == '4') {
302			this.fromIMAADPCM();
303			}
304			}
305
306			/**
307			* Return 'RIFF' if the container is 'RF64', the current container name
308			* otherwise. Used to enforce 'RIFF' when RF64 is not allowed.
309			* @return {string}
310			* @private
311			*/
312			correctContainer_() {
313			return this.container == 'RF64' ? 'RIFF' : this.container;
314			}
315
316			/**
317			* Set up the WaveFileCreator object based on the arguments passed.
318			* This method only reset the fmt , fact, ds64 and data chunks.
319			* @param {number} numChannels The number of channels
320			* (Integer numbers: 1 for mono, 2 stereo and so on).
321			* @param {number} sampleRate The sample rate.
322			* Integer numbers like 8000, 44100, 48000, 96000, 192000.
323			* @param {string} bitDepthCode The audio bit depth code.
324			* One of '4', '8', '8a', '8m', '16', '24', '32', '32f', '64'
325			* or any value between '8' and '32' (like '12').
326			* @param {!(Array\|TypedArray)} samples
327			* The samples. Must be in the correct range according to the bit depth.
328			* @param {Object} options Used to define the container. Uses RIFF by default.
329			* @throws {Error} If any argument does not meet the criteria.
330			* @private
331			*/
332			fromExisting_(numChannels, sampleRate, bitDepthCode, samples, options) {
333			/** @type {!Object} */
334			let tmpWav = new WaveFileCueEditor();
335			Object.assign(this.fmt, tmpWav.fmt);
336			Object.assign(this.fact, tmpWav.fact);
337			Object.assign(this.ds64, tmpWav.ds64);
338			Object.assign(this.data, tmpWav.data);
339			this.newWavFile_(numChannels, sampleRate, bitDepthCode, samples, options);
340			}
341			}
342
343			/**
344			* Return the size in bytes of the output sample array when applying
345			* compression to 16-bit samples.
346			* @return {number}
347			* @private
348			*/
349			function outputSize_(byteLen, byteOffset) {
350			/** @type {number} */
351			let outputSize = byteLen / byteOffset;
352			if (outputSize % 2) {
353			outputSize++;
354			}
355			return outputSize;
356			}
357

rochars / wavefile

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WaveFileConverter.toSampleRate A

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