WaveFile.fromBase64 - Code Metrics - Inspection of "Move LIST-related getters to WaveFile" - rochars/wavefile - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Branch — wavefile-reader (b7dc7a)

by Rafael S.

created 2019-08-13 03:29 UTC

WaveFile.fromBase64 A

↳ Parent: WaveFile

Complexity

Conditions

Size

Total Lines	3
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	1
eloc	2
dl	0
loc	3
rs	10
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 WaveFile class.
 * @see https://github.com/rochars/wavefile
 */

/** @module wavefile */

import {encode, decode} from 'base64-arraybuffer-es6';
import WaveFileConverter from './lib/wavefile-converter';
import fixRIFFTag from './lib/fix-riff-tag';

/**
 * A class to manipulate wav files.
 * @extends WaveFileConverter
 */
export default class WaveFile extends WaveFileConverter {

  /**
   * Use a .wav file encoded as a base64 string to load the WaveFile object.
   * @param {string} base64String A .wav file as a base64 string.
   * @throws {Error} If any property of the object appears invalid.
   */
  fromBase64(base64String) {
    this.fromBuffer(new Uint8Array(decode(base64String)));
  }

  /**
   * Return a base64 string representig the WaveFile object as a .wav file.
   * @return {string} A .wav file as a base64 string.
   * @throws {Error} If any property of the object appears invalid.
   */
  toBase64() {
    /** @type {!Uint8Array} */
    let buffer = this.toBuffer();
    return encode(buffer, 0, buffer.length);
  }

  /**
   * Return a DataURI string representig the WaveFile object as a .wav file.
   * The return of this method can be used to load the audio in browsers.
   * @return {string} A .wav file as a DataURI.
   * @throws {Error} If any property of the object appears invalid.
   */
  toDataURI() {
    return 'data:audio/wav;base64,' + this.toBase64();
  }

  /**
   * Use a .wav file encoded as a DataURI to load the WaveFile object.
   * @param {string} dataURI A .wav file as DataURI.
   * @throws {Error} If any property of the object appears invalid.
   */
  fromDataURI(dataURI) {
    this.fromBase64(dataURI.replace('data:audio/wav;base64,', ''));
  }

  /**
   * Return the value of a RIFF tag in the INFO chunk.
   * @param {string} tag The tag name.
   * @return {?string} The value if the tag is found, null otherwise.
   */
  getTag(tag) {
    /** @type {!Object} */
    let index = this.getTagIndex_(tag);
    if (index.TAG !== null) {
      return this.LIST[index.LIST].subChunks[index.TAG].value;
    }
    return null;
  }

  /**
   * Write a RIFF tag in the INFO chunk. If the tag do not exist,
   * then it is created. It if exists, it is overwritten.
   * @param {string} tag The tag name.
   * @param {string} value The tag value.
   * @throws {Error} If the tag name is not valid.
   */
  setTag(tag, value) {
    tag = fixRIFFTag(tag);
    /** @type {!Object} */
    let index = this.getTagIndex_(tag);
    if (index.TAG !== null) {
      this.LIST[index.LIST].subChunks[index.TAG].chunkSize =
        value.length + 1;
      this.LIST[index.LIST].subChunks[index.TAG].value = value;
    } else if (index.LIST !== null) {
      this.LIST[index.LIST].subChunks.push({
        chunkId: tag,
        chunkSize: value.length + 1,
        value: value});
    } else {
      this.LIST.push({
        chunkId: 'LIST',
        chunkSize: 8 + value.length + 1,
        format: 'INFO',
        subChunks: []});
      this.LIST[this.LIST.length - 1].subChunks.push({
        chunkId: tag,
        chunkSize: value.length + 1,
        value: value});
    }
  }

  /**
   * Remove a RIFF tag from the INFO chunk.
   * @param {string} tag The tag name.
   * @return {boolean} True if a tag was deleted.
   */
  deleteTag(tag) {
    /** @type {!Object} */
    let index = this.getTagIndex_(tag);
    if (index.TAG !== null) {
      this.LIST[index.LIST].subChunks.splice(index.TAG, 1);
      return true;
    }
    return false;
  }

  /**
   * Return a Object<tag, value> with the RIFF tags in the file.
   * @return {!Object<string, string>} The file tags.
   */
  listTags() {
    /** @type {?number} */
    let index = this.getLISTINFOIndex_();
    /** @type {!Object} */
    let tags = {};
    if (index !== null) {
      for (let i = 0, len = this.LIST[index].subChunks.length; i < len; i++) {
        tags[this.LIST[index].subChunks[i].chunkId] =
          this.LIST[index].subChunks[i].value;
      }
    }
    return tags;
  }

  /**
   * Return an array with all cue points in the file, in the order they appear
   * in the file.
   * The difference between this method and using the list in WaveFile.cue
   * is that the return value of this method includes the position in
   * milliseconds of each cue point (WaveFile.cue only have the sample offset)
   * @return {!Array<!Object>}
   */
  listCuePoints() {
    /** @type {!Array<!Object>} */
    let points = this.getCuePoints_();
    for (let i = 0, len = points.length; i < len; i++) {
      points[i].milliseconds =
        (points[i].dwPosition / this.fmt.sampleRate) * 1000;
    }
    return points;
  }

  /**
   * Create a cue point in the wave file.
   * @param {number} position The cue point position in milliseconds.
   * @param {string} labl The LIST adtl labl text of the marker. Optional.
   */
  setCuePoint(position, labl='') {
    this.cue.chunkId = 'cue ';
    position = (position * this.fmt.sampleRate) / 1000;
    /** @type {!Array<!Object>} */
    let existingPoints = this.getCuePoints_();
    this.clearLISTadtl_();
    /** @type {number} */
    let len = this.cue.points.length;
    this.cue.points = [];
    /** @type {boolean} */
    let hasSet = false;
    if (len === 0) {
      this.setCuePoint_(position, 1, labl);
    } else {
      for (let i = 0; i < len; i++) {
        if (existingPoints[i].dwPosition > position && !hasSet) {
          this.setCuePoint_(position, i + 1, labl);
          this.setCuePoint_(
            existingPoints[i].dwPosition,
            i + 2,
            existingPoints[i].label);
          hasSet = true;
        } else {
          this.setCuePoint_(
            existingPoints[i].dwPosition,
            i + 1,
            existingPoints[i].label);
        }
      }
      if (!hasSet) {
        this.setCuePoint_(position, this.cue.points.length + 1, labl);
      }
    }
    this.cue.dwCuePoints = this.cue.points.length;
  }

  /**
   * Remove a cue point from a wave file.
   * @param {number} index the index of the point. First is 1,
   *    second is 2, and so on.
   */
  deleteCuePoint(index) {
    this.cue.chunkId = 'cue ';
    /** @type {!Array<!Object>} */
    let existingPoints = this.getCuePoints_();
    this.clearLISTadtl_();
    /** @type {number} */
    let len = this.cue.points.length;
    this.cue.points = [];
    for (let i = 0; i < len; i++) {
      if (i + 1 !== index) {
        this.setCuePoint_(
          existingPoints[i].dwPosition,
          i + 1,
          existingPoints[i].label);
      }
    }
    this.cue.dwCuePoints = this.cue.points.length;
    if (this.cue.dwCuePoints) {
      this.cue.chunkId = 'cue ';
    } else {
      this.cue.chunkId = '';
      this.clearLISTadtl_();
    }
  }

  /**
   * Update the label of a cue point.
   * @param {number} pointIndex The ID of the cue point.
   * @param {string} label The new text for the label.
   */
  updateLabel(pointIndex, label) {
    /** @type {?number} */
    let cIndex = this.getAdtlChunk_();
    if (cIndex !== null) {
      for (let i = 0, len = this.LIST[cIndex].subChunks.length; i < len; i++) {
        if (this.LIST[cIndex].subChunks[i].dwName ==
            pointIndex) {
          this.LIST[cIndex].subChunks[i].value = label;
        }
      }
    }
  }

  /**
   * Return an array with all cue points in the file, in the order they appear
   * in the file.
   * @return {!Array<!Object>}
   * @private
   */
  getCuePoints_() {
    /** @type {!Array<!Object>} */
    let points = [];
    for (let i = 0, len = this.cue.points.length; i < len; i++) {
      points.push({
        dwPosition: this.cue.points[i].dwPosition,
        label: this.getLabelForCuePoint_(
          this.cue.points[i].dwName)});
    }
    return points;
  }

  /**
   * Return the label of a cue point.
   * @param {number} pointDwName The ID of the cue point.
   * @return {string}
   * @private
   */
  getLabelForCuePoint_(pointDwName) {
    /** @type {?number} */
    let cIndex = this.getAdtlChunk_();
    if (cIndex !== null) {
      for (let i = 0, len = this.LIST[cIndex].subChunks.length; i < len; i++) {
        if (this.LIST[cIndex].subChunks[i].dwName ==
            pointDwName) {
          return this.LIST[cIndex].subChunks[i].value;
        }
      }
    }
    return '';
  }

  /**
   * Return the index of the INFO chunk in the LIST chunk.
   * @return {?number} the index of the INFO chunk.
   * @private
   */
  getLISTINFOIndex_() {
    /** @type {?number} */
    let index = null;
    for (let i = 0, len = this.LIST.length; i < len; i++) {
      if (this.LIST[i].format === 'INFO') {
        index = i;
        break;
      }
    }
    return index;
  }

  /**
   * Return the index of the 'adtl' LIST in this.LIST.
   * @return {?number}
   * @private
   */
  getAdtlChunk_() {
    for (let i = 0, len = this.LIST.length; i < len; i++) {
      if (this.LIST[i].format == 'adtl') {
        return i;
      }
    }
    return null;
  }

  /**
   * Return the index of a tag in a FILE chunk.
   * @param {string} tag The tag name.
   * @return {!Object<string, ?number>}
   *    Object.LIST is the INFO index in LIST
   *    Object.TAG is the tag index in the INFO
   * @private
   */
  getTagIndex_(tag) {
    /** @type {!Object<string, ?number>} */
    let index = {LIST: null, TAG: null};
    for (let i = 0, len = this.LIST.length; i < len; i++) {
      if (this.LIST[i].format == 'INFO') {
        index.LIST = i;
        for (let j=0, subLen = this.LIST[i].subChunks.length; j < subLen; j++) {
          if (this.LIST[i].subChunks[j].chunkId == tag) {
            index.TAG = j;
            break;
          }
        }
        break;
      }
    }
    return index;
  }

  /**
   * Push a new cue point in this.cue.points.
   * @param {number} position The position in milliseconds.
   * @param {number} dwName the dwName of the cue point
   * @private
   */
  setCuePoint_(position, dwName, label) {
    this.cue.points.push({
      dwName: dwName,
      dwPosition: position,
      fccChunk: 'data',
      dwChunkStart: 0,
      dwBlockStart: 0,
      dwSampleOffset: position,
    });
    this.setLabl_(dwName, label);
  }

  /**
   * Clear any LIST chunk labeled as 'adtl'.
   * @private
   */
  clearLISTadtl_() {
    for (let i = 0, len = this.LIST.length; i < len; i++) {
      if (this.LIST[i].format == 'adtl') {
        this.LIST.splice(i);
      }
    }
  }

  /**
   * Create a new 'labl' subchunk in a 'LIST' chunk of type 'adtl'.
   * @param {number} dwName The ID of the cue point.
   * @param {string} label The label for the cue point.
   * @private
   */
  setLabl_(dwName, label) {
    /** @type {?number} */
    let adtlIndex = this.getAdtlChunk_();
    if (adtlIndex === null) {
      this.LIST.push({
        chunkId: 'LIST',
        chunkSize: 4,
        format: 'adtl',
        subChunks: []});
      adtlIndex = this.LIST.length - 1;
    }
    this.setLabelText_(adtlIndex === null ? 0 : adtlIndex, dwName, label);
  }

  /**
   * Create a new 'labl' subchunk in a 'LIST' chunk of type 'adtl'.
   * @param {number} adtlIndex The index of the 'adtl' LIST in this.LIST.
   * @param {number} dwName The ID of the cue point.
   * @param {string} label The label for the cue point.
   * @private
   */
  setLabelText_(adtlIndex, dwName, label) {
    this.LIST[adtlIndex].subChunks.push({
      chunkId: 'labl',
      chunkSize: label.length,
      dwName: dwName,
      value: label
    });
    this.LIST[adtlIndex].chunkSize += label.length + 4 + 4 + 4 + 1;
  }
}


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 WaveFile class.
27			* @see https://github.com/rochars/wavefile
28			*/
29
30			/** @module wavefile */
31
32			import {encode, decode} from 'base64-arraybuffer-es6';
33			import WaveFileConverter from './lib/wavefile-converter';
34			import fixRIFFTag from './lib/fix-riff-tag';
35
36			/**
37			* A class to manipulate wav files.
38			* @extends WaveFileConverter
39			*/
40			export default class WaveFile extends WaveFileConverter {
41
42			/**
43			* Use a .wav file encoded as a base64 string to load the WaveFile object.
44			* @param {string} base64String A .wav file as a base64 string.
45			* @throws {Error} If any property of the object appears invalid.
46			*/
47			fromBase64(base64String) {
48			this.fromBuffer(new Uint8Array(decode(base64String)));
49			}
50
51			/**
52			* Return a base64 string representig the WaveFile object as a .wav file.
53			* @return {string} A .wav file as a base64 string.
54			* @throws {Error} If any property of the object appears invalid.
55			*/
56			toBase64() {
57			/** @type {!Uint8Array} */
58			let buffer = this.toBuffer();
59			return encode(buffer, 0, buffer.length);
60			}
61
62			/**
63			* Return a DataURI string representig the WaveFile object as a .wav file.
64			* The return of this method can be used to load the audio in browsers.
65			* @return {string} A .wav file as a DataURI.
66			* @throws {Error} If any property of the object appears invalid.
67			*/
68			toDataURI() {
69			return 'data:audio/wav;base64,' + this.toBase64();
70			}
71
72			/**
73			* Use a .wav file encoded as a DataURI to load the WaveFile object.
74			* @param {string} dataURI A .wav file as DataURI.
75			* @throws {Error} If any property of the object appears invalid.
76			*/
77			fromDataURI(dataURI) {
78			this.fromBase64(dataURI.replace('data:audio/wav;base64,', ''));
79			}
80
81			/**
82			* Return the value of a RIFF tag in the INFO chunk.
83			* @param {string} tag The tag name.
84			* @return {?string} The value if the tag is found, null otherwise.
85			*/
86			getTag(tag) {
87			/** @type {!Object} */
88			let index = this.getTagIndex_(tag);
89			if (index.TAG !== null) {
90			return this.LIST[index.LIST].subChunks[index.TAG].value;
91			}
92			return null;
93			}
94
95			/**
96			* Write a RIFF tag in the INFO chunk. If the tag do not exist,
97			* then it is created. It if exists, it is overwritten.
98			* @param {string} tag The tag name.
99			* @param {string} value The tag value.
100			* @throws {Error} If the tag name is not valid.
101			*/
102			setTag(tag, value) {
103			tag = fixRIFFTag(tag);
104			/** @type {!Object} */
105			let index = this.getTagIndex_(tag);
106			if (index.TAG !== null) {
107			this.LIST[index.LIST].subChunks[index.TAG].chunkSize =
108			value.length + 1;
109			this.LIST[index.LIST].subChunks[index.TAG].value = value;
110			} else if (index.LIST !== null) {
111			this.LIST[index.LIST].subChunks.push({
112			chunkId: tag,
113			chunkSize: value.length + 1,
114			value: value});
115			} else {
116			this.LIST.push({
117			chunkId: 'LIST',
118			chunkSize: 8 + value.length + 1,
119			format: 'INFO',
120			subChunks: []});
121			this.LIST[this.LIST.length - 1].subChunks.push({
122			chunkId: tag,
123			chunkSize: value.length + 1,
124			value: value});
125			}
126			}
127
128			/**
129			* Remove a RIFF tag from the INFO chunk.
130			* @param {string} tag The tag name.
131			* @return {boolean} True if a tag was deleted.
132			*/
133			deleteTag(tag) {
134			/** @type {!Object} */
135			let index = this.getTagIndex_(tag);
136			if (index.TAG !== null) {
137			this.LIST[index.LIST].subChunks.splice(index.TAG, 1);
138			return true;
139			}
140			return false;
141			}
142
143			/**
144			* Return a Object<tag, value> with the RIFF tags in the file.
145			* @return {!Object<string, string>} The file tags.
146			*/
147			listTags() {
148			/** @type {?number} */
149			let index = this.getLISTINFOIndex_();
150			/** @type {!Object} */
151			let tags = {};
152			if (index !== null) {
153			for (let i = 0, len = this.LIST[index].subChunks.length; i < len; i++) {
154			tags[this.LIST[index].subChunks[i].chunkId] =
155			this.LIST[index].subChunks[i].value;
156			}
157			}
158			return tags;
159			}
160
161			/**
162			* Return an array with all cue points in the file, in the order they appear
163			* in the file.
164			* The difference between this method and using the list in WaveFile.cue
165			* is that the return value of this method includes the position in
166			* milliseconds of each cue point (WaveFile.cue only have the sample offset)
167			* @return {!Array<!Object>}
168			*/
169			listCuePoints() {
170			/** @type {!Array<!Object>} */
171			let points = this.getCuePoints_();
172			for (let i = 0, len = points.length; i < len; i++) {
173			points[i].milliseconds =
174			(points[i].dwPosition / this.fmt.sampleRate) * 1000;
175			}
176			return points;
177			}
178
179			/**
180			* Create a cue point in the wave file.
181			* @param {number} position The cue point position in milliseconds.
182			* @param {string} labl The LIST adtl labl text of the marker. Optional.
183			*/
184			setCuePoint(position, labl='') {
185			this.cue.chunkId = 'cue ';
186			position = (position * this.fmt.sampleRate) / 1000;
187			/** @type {!Array<!Object>} */
188			let existingPoints = this.getCuePoints_();
189			this.clearLISTadtl_();
190			/** @type {number} */
191			let len = this.cue.points.length;
192			this.cue.points = [];
193			/** @type {boolean} */
194			let hasSet = false;
195			if (len === 0) {
196			this.setCuePoint_(position, 1, labl);
197			} else {
198			for (let i = 0; i < len; i++) {
199			if (existingPoints[i].dwPosition > position && !hasSet) {
200			this.setCuePoint_(position, i + 1, labl);
201			this.setCuePoint_(
202			existingPoints[i].dwPosition,
203			i + 2,
204			existingPoints[i].label);
205			hasSet = true;
206			} else {
207			this.setCuePoint_(
208			existingPoints[i].dwPosition,
209			i + 1,
210			existingPoints[i].label);
211			}
212			}
213			if (!hasSet) {
214			this.setCuePoint_(position, this.cue.points.length + 1, labl);
215			}
216			}
217			this.cue.dwCuePoints = this.cue.points.length;
218			}
219
220			/**
221			* Remove a cue point from a wave file.
222			* @param {number} index the index of the point. First is 1,
223			* second is 2, and so on.
224			*/
225			deleteCuePoint(index) {
226			this.cue.chunkId = 'cue ';
227			/** @type {!Array<!Object>} */
228			let existingPoints = this.getCuePoints_();
229			this.clearLISTadtl_();
230			/** @type {number} */
231			let len = this.cue.points.length;
232			this.cue.points = [];
233			for (let i = 0; i < len; i++) {
234			if (i + 1 !== index) {
235			this.setCuePoint_(
236			existingPoints[i].dwPosition,
237			i + 1,
238			existingPoints[i].label);
239			}
240			}
241			this.cue.dwCuePoints = this.cue.points.length;
242			if (this.cue.dwCuePoints) {
243			this.cue.chunkId = 'cue ';
244			} else {
245			this.cue.chunkId = '';
246			this.clearLISTadtl_();
247			}
248			}
249
250			/**
251			* Update the label of a cue point.
252			* @param {number} pointIndex The ID of the cue point.
253			* @param {string} label The new text for the label.
254			*/
255			updateLabel(pointIndex, label) {
256			/** @type {?number} */
257			let cIndex = this.getAdtlChunk_();
258			if (cIndex !== null) {
259			for (let i = 0, len = this.LIST[cIndex].subChunks.length; i < len; i++) {
260			if (this.LIST[cIndex].subChunks[i].dwName ==
261			pointIndex) {
262			this.LIST[cIndex].subChunks[i].value = label;
263			}
264			}
265			}
266			}
267
268			/**
269			* Return an array with all cue points in the file, in the order they appear
270			* in the file.
271			* @return {!Array<!Object>}
272			* @private
273			*/
274			getCuePoints_() {
275			/** @type {!Array<!Object>} */
276			let points = [];
277			for (let i = 0, len = this.cue.points.length; i < len; i++) {
278			points.push({
279			dwPosition: this.cue.points[i].dwPosition,
280			label: this.getLabelForCuePoint_(
281			this.cue.points[i].dwName)});
282			}
283			return points;
284			}
285
286			/**
287			* Return the label of a cue point.
288			* @param {number} pointDwName The ID of the cue point.
289			* @return {string}
290			* @private
291			*/
292			getLabelForCuePoint_(pointDwName) {
293			/** @type {?number} */
294			let cIndex = this.getAdtlChunk_();
295			if (cIndex !== null) {
296			for (let i = 0, len = this.LIST[cIndex].subChunks.length; i < len; i++) {
297			if (this.LIST[cIndex].subChunks[i].dwName ==
298			pointDwName) {
299			return this.LIST[cIndex].subChunks[i].value;
300			}
301			}
302			}
303			return '';
304			}
305
306			/**
307			* Return the index of the INFO chunk in the LIST chunk.
308			* @return {?number} the index of the INFO chunk.
309			* @private
310			*/
311			getLISTINFOIndex_() {
312			/** @type {?number} */
313			let index = null;
314			for (let i = 0, len = this.LIST.length; i < len; i++) {
315			if (this.LIST[i].format === 'INFO') {
316			index = i;
317			break;
318			}
319			}
320			return index;
321			}
322
323			/**
324			* Return the index of the 'adtl' LIST in this.LIST.
325			* @return {?number}
326			* @private
327			*/
328			getAdtlChunk_() {
329			for (let i = 0, len = this.LIST.length; i < len; i++) {
330			if (this.LIST[i].format == 'adtl') {
331			return i;
332			}
333			}
334			return null;
335			}
336
337			/**
338			* Return the index of a tag in a FILE chunk.
339			* @param {string} tag The tag name.
340			* @return {!Object<string, ?number>}
341			* Object.LIST is the INFO index in LIST
342			* Object.TAG is the tag index in the INFO
343			* @private
344			*/
345			getTagIndex_(tag) {
346			/** @type {!Object<string, ?number>} */
347			let index = {LIST: null, TAG: null};
348			for (let i = 0, len = this.LIST.length; i < len; i++) {
349			if (this.LIST[i].format == 'INFO') {
350			index.LIST = i;
351			for (let j=0, subLen = this.LIST[i].subChunks.length; j < subLen; j++) {
352			if (this.LIST[i].subChunks[j].chunkId == tag) {
353			index.TAG = j;
354			break;
355			}
356			}
357			break;
358			}
359			}
360			return index;
361			}
362
363			/**
364			* Push a new cue point in this.cue.points.
365			* @param {number} position The position in milliseconds.
366			* @param {number} dwName the dwName of the cue point
367			* @private
368			*/
369			setCuePoint_(position, dwName, label) {
370			this.cue.points.push({
371			dwName: dwName,
372			dwPosition: position,
373			fccChunk: 'data',
374			dwChunkStart: 0,
375			dwBlockStart: 0,
376			dwSampleOffset: position,
377			});
378			this.setLabl_(dwName, label);
379			}
380
381			/**
382			* Clear any LIST chunk labeled as 'adtl'.
383			* @private
384			*/
385			clearLISTadtl_() {
386			for (let i = 0, len = this.LIST.length; i < len; i++) {
387			if (this.LIST[i].format == 'adtl') {
388			this.LIST.splice(i);
389			}
390			}
391			}
392
393			/**
394			* Create a new 'labl' subchunk in a 'LIST' chunk of type 'adtl'.
395			* @param {number} dwName The ID of the cue point.
396			* @param {string} label The label for the cue point.
397			* @private
398			*/
399			setLabl_(dwName, label) {
400			/** @type {?number} */
401			let adtlIndex = this.getAdtlChunk_();
402			if (adtlIndex === null) {
403			this.LIST.push({
404			chunkId: 'LIST',
405			chunkSize: 4,
406			format: 'adtl',
407			subChunks: []});
408			adtlIndex = this.LIST.length - 1;
409			}
410			this.setLabelText_(adtlIndex === null ? 0 : adtlIndex, dwName, label);
411			}
412
413			/**
414			* Create a new 'labl' subchunk in a 'LIST' chunk of type 'adtl'.
415			* @param {number} adtlIndex The index of the 'adtl' LIST in this.LIST.
416			* @param {number} dwName The ID of the cue point.
417			* @param {string} label The label for the cue point.
418			* @private
419			*/
420			setLabelText_(adtlIndex, dwName, label) {
421			this.LIST[adtlIndex].subChunks.push({
422			chunkId: 'labl',
423			chunkSize: label.length,
424			dwName: dwName,
425			value: label
426			});
427			this.LIST[adtlIndex].chunkSize += label.length + 4 + 4 + 4 + 1;
428			}
429			}
430

rochars / wavefile

Branch — wavefile-reader (b7dc7a)

WaveFile.fromBase64 A

Complexity

Size

Duplication

Importance

Duplication Side-by-Side

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