wavefile-converter.js ➔ truncateIntSamples - Code Metrics - Inspection of "Back with lib/truncate-samples to not break tests" - rochars/wavefile - Measure and Improve Code Quality continuously with Scrutinizer

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by Rafael S.

created 2020-01-27 16:40 UTC

wavefile-converter.js ➔ truncateIntSamples B

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Complexity

Conditions

Size

Total Lines	12
Code Lines	9

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	6
eloc	9
dl	0
loc	12
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 WaveFileConverter class.
 * @see https://github.com/rochars/wavefile
 */

import { changeBitDepth } from 'bitdepth';
import * as imaadpcm from 'imaadpcm';
import * as alawmulaw from 'alawmulaw';
import { unpackArrayTo } from 'byte-data';
import { WaveFileCueEditor } from './wavefile-cue-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 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, false, false);
    this.fromExisting_(
      this.fmt.numChannels,
      this.fmt.sampleRate,
      this.bitDepth,
      output);
  }

  /**
   * 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, false, false);
    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, false, false);
      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(
      outputSize_(this.data.samples.length, 2));
    unpackArrayTo(this.data.samples, this.dataType, output,
        0, this.data.samples.length, false, false);
    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(
      outputSize_(this.data.samples.length, 2));
    unpackArrayTo(this.data.samples, this.dataType, output,
        0, this.data.samples.length, false, false);
    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 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 'bitdepth';
31			import * as imaadpcm from 'imaadpcm';
32			import * as alawmulaw from 'alawmulaw';
33			import { unpackArrayTo } from 'byte-data';
34			import { WaveFileCueEditor } from './wavefile-cue-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 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, false, false);
55			this.fromExisting_(
56			this.fmt.numChannels,
57			this.fmt.sampleRate,
58			this.bitDepth,
59			output);
60			}
61
62			/**
63			* Force a file as RIFX.
64			*/
65			toRIFX() {
66			/** @type {!Float64Array} */
67			let output = new Float64Array(
68			outputSize_(this.data.samples.length, this.dataType.bits / 8));
69			unpackArrayTo(this.data.samples, this.dataType, output,
70			0, this.data.samples.length, false, false);
71			this.fromExisting_(
72			this.fmt.numChannels,
73			this.fmt.sampleRate,
74			this.bitDepth,
75			output,
76			{container: 'RIFX'});
77			}
78
79			/**
80			* Encode a 16-bit wave file as 4-bit IMA ADPCM.
81			* @throws {Error} If sample rate is not 8000.
82			* @throws {Error} If number of channels is not 1.
83			*/
84			toIMAADPCM() {
85			if (this.fmt.sampleRate !== 8000) {
86			throw new Error(
87			'Only 8000 Hz files can be compressed as IMA-ADPCM.');
88			} else if (this.fmt.numChannels !== 1) {
89			throw new Error(
90			'Only mono files can be compressed as IMA-ADPCM.');
91			} else {
92			this.assure16Bit_();
93			/** @type {!Int16Array} */
94			let output = new Int16Array(
95			outputSize_(this.data.samples.length, 2));
96			unpackArrayTo(this.data.samples, this.dataType, output,
97			0, this.data.samples.length, false, false);
98			this.fromExisting_(
99			this.fmt.numChannels,
100			this.fmt.sampleRate,
101			'4',
102			imaadpcm.encode(output),
103			{container: this.correctContainer_()});
104			}
105			}
106
107			/**
108			* Decode a 4-bit IMA ADPCM wave file as a 16-bit wave file.
109			* @param {string} bitDepthCode The new bit depth of the samples.
110			* One of '8' ... '32' (integers), '32f' or '64' (floats).
111			* Optional. Default is 16.
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, false, false);
135			this.fromExisting_(
136			this.fmt.numChannels,
137			this.fmt.sampleRate,
138			'8a',
139			alawmulaw.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 The new bit depth of the samples.
146			* One of '8' ... '32' (integers), '32f' or '64' (floats).
147			* Optional. Default is 16.
148			*/
149			fromALaw(bitDepthCode='16') {
150			this.fromExisting_(
151			this.fmt.numChannels,
152			this.fmt.sampleRate,
153			'16',
154			alawmulaw.alaw.decode(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, false, false);
171			this.fromExisting_(
172			this.fmt.numChannels,
173			this.fmt.sampleRate,
174			'8m',
175			alawmulaw.mulaw.encode(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 The new bit depth of the samples.
182			* One of '8' ... '32' (integers), '32f' or '64' (floats).
183			* Optional. Default is 16.
184			*/
185			fromMuLaw(bitDepthCode='16') {
186			this.fromExisting_(
187			this.fmt.numChannels,
188			this.fmt.sampleRate,
189			'16',
190			alawmulaw.mulaw.decode(this.data.samples),
191			{container: this.correctContainer_()});
192			if (bitDepthCode != '16') {
193			this.toBitDepth(bitDepthCode);
194			}
195			}
196
197			/**
198			* Change the bit depth of the samples.
199			* @param {string} newBitDepth The new bit depth of the samples.
200			* One of '8' ... '32' (integers), '32f' or '64' (floats)
201			* @param {boolean} changeResolution A boolean indicating if the
202			* resolution of samples should be actually changed or not.
203			* @throws {Error} If the bit depth is not valid.
204			*/
205			toBitDepth(newBitDepth, changeResolution=true) {
206			/** @type {string} */
207			let toBitDepth = newBitDepth;
208			/** @type {string} */
209			let thisBitDepth = this.bitDepth;
210			if (!changeResolution) {
211			if (newBitDepth != '32f') {
212			toBitDepth = this.dataType.bits.toString();
213			}
214			thisBitDepth = '' + this.dataType.bits;
215			}
216			// If the file is compressed, make it
217			// PCM before changing the bit depth
218			this.assureUncompressed_();
219			/**
220			* The original samples, interleaved.
221			* @type {!Array\|!TypedArray}
222			*/
223			let samples = this.getSamples(true);
224			/**
225			* The container for the new samples.
226			* @type {!Float64Array}
227			*/
228			let newSamples = new Float64Array(samples.length);
229			// Change the bit depth
230			changeBitDepth(samples, thisBitDepth, newSamples, toBitDepth);
231			// Re-create the file
232			this.fromExisting_(
233			this.fmt.numChannels,
234			this.fmt.sampleRate,
235			newBitDepth,
236			newSamples,
237			{container: this.correctContainer_()});
238			}
239
240			/**
241			* Convert the sample rate of the file.
242			* @param {number} sampleRate The target sample rate.
243			* @param {?Object} details The extra configuration, if needed.
244			*/
245			toSampleRate(sampleRate, details={}) {
246			this.validateResample_(sampleRate);
247			/** @type {!Array\|!TypedArray} */
248			let samples = this.getSamples();
249			/** @type {!Array\|!Float64Array} */
250			let newSamples = [];
251			// Mono files
252			if (samples.constructor === Float64Array) {
253			newSamples = resample(samples, this.fmt.sampleRate, sampleRate, details);
254			// Multi-channel files
255			} else {
256			for (let i = 0; i < samples.length; i++) {
257			newSamples.push(resample(
258			samples[i], this.fmt.sampleRate, sampleRate, details));
259			}
260			}
261			// Truncate samples
262			if (this.bitDepth !== '64' && this.bitDepth !== '32f') {
263			// Truncate samples in mono files
264			if (newSamples[0].constructor === Number) {
265			truncateIntSamples(newSamples, this.dataType.bits);
266			// Truncate samples in multi-channel files
267			} else {
268			for (let i = 0; i < newSamples.length; i++) {
269			truncateIntSamples(newSamples[i], this.dataType.bits);
270			}
271			}
272			}
273			// Recreate the file
274			this.fromExisting_(
275			this.fmt.numChannels, sampleRate, this.bitDepth, newSamples,
276			{'container': this.correctContainer_()});
277			}
278
279			/**
280			* Validate the conditions for resampling.
281			* @param {number} sampleRate The target sample rate.
282			* @throws {Error} If the file cant be resampled.
283			* @private
284			*/
285			validateResample_(sampleRate) {
286			if (!validateSampleRate(
287			this.fmt.numChannels, this.fmt.bitsPerSample, sampleRate)) {
288			throw new Error('Invalid sample rate.');
289			} else if (['4','8a','8m'].indexOf(this.bitDepth) > -1) {
290			throw new Error(
291			'wavefile can\'t change the sample rate of compressed files.');
292			}
293			}
294
295			/**
296			* Make the file 16-bit if it is not.
297			* @private
298			*/
299			assure16Bit_() {
300			this.assureUncompressed_();
301			if (this.bitDepth != '16') {
302			this.toBitDepth('16');
303			}
304			}
305
306			/**
307			* Uncompress the samples in case of a compressed file.
308			* @private
309			*/
310			assureUncompressed_() {
311			if (this.bitDepth == '8a') {
312			this.fromALaw();
313			} else if (this.bitDepth == '8m') {
314			this.fromMuLaw();
315			} else if (this.bitDepth == '4') {
316			this.fromIMAADPCM();
317			}
318			}
319
320			/**
321			* Return 'RIFF' if the container is 'RF64', the current container name
322			* otherwise. Used to enforce 'RIFF' when RF64 is not allowed.
323			* @return {string}
324			* @private
325			*/
326			correctContainer_() {
327			return this.container == 'RF64' ? 'RIFF' : this.container;
328			}
329
330			/**
331			* Set up the WaveFileCreator object based on the arguments passed.
332			* This method only reset the fmt , fact, ds64 and data chunks.
333			* @param {number} numChannels The number of channels
334			* (Integer numbers: 1 for mono, 2 stereo and so on).
335			* @param {number} sampleRate The sample rate.
336			* Integer numbers like 8000, 44100, 48000, 96000, 192000.
337			* @param {string} bitDepthCode The audio bit depth code.
338			* One of '4', '8', '8a', '8m', '16', '24', '32', '32f', '64'
339			* or any value between '8' and '32' (like '12').
340			* @param {!Array\|!TypedArray} samples
341			* The samples. Must be in the correct range according to the bit depth.
342			* @param {?Object} options Optional. Used to force the container
343			* as RIFX with {'container': 'RIFX'}
344			* @throws {Error} If any argument does not meet the criteria.
345			* @private
346			*/
347			fromExisting_(numChannels, sampleRate, bitDepthCode, samples, options={}) {
348			let tmpWav = new WaveFileCueEditor();
349			Object.assign(this.fmt, tmpWav.fmt);
350			Object.assign(this.fact, tmpWav.fact);
351			Object.assign(this.ds64, tmpWav.ds64);
352			Object.assign(this.data, tmpWav.data);
353			this.newWavFile_(numChannels, sampleRate, bitDepthCode, samples, options);
354			}
355			}
356
357			/**
358			* Return the size in bytes of the output sample array when applying
359			* compression to 16-bit samples.
360			* @return {number}
361			* @private
362			*/
363			function outputSize_(byteLen, byteOffset) {
364			/** @type {number} */
365			let outputSize = byteLen / byteOffset;
366			if (outputSize % 2) {
367			outputSize++;
368			}
369			return outputSize;
370			}
371

rochars / wavefile

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wavefile-converter.js ➔ truncateIntSamples B

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