WaveFile.setLabl_ - Code Metrics - Inspection of "Create the WaveFileConverter class" - rochars/wavefile - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Branch — wavefile-rw (0c075d)

by Rafael S.

created 2019-08-07 16:57 UTC

WaveFile.setLabl_ A

↳ Parent: WaveFile

Complexity

Conditions

Size

Total Lines	13
Code Lines	10

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	3
eloc	10
dl	0
loc	13
rs	9.9
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.
 */
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,', ''));
  }

  /**
   * 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});
    }
  }

  /**
   * 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;
  }

  /**
   * 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;
  }

  /**
   * 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;
  }

  /**
   * 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_();
    }
  }

  /**
   * 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;
  }

  /**
   * 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;
        }
      }
    }
  }

  /**
   * 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);
  }

  /**
   * 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 '';
  }

  /**
   * 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;
  }

  /**
   * 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 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 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;
  }
}


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

rochars / wavefile

Branch — wavefile-rw (0c075d)

WaveFile.setLabl_ A

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