lib/wavefile-parser.js - Code Metrics - Inspection of "Add the WaveFileMetaEditor class" - rochars/wavefile - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( 6ca9b2...ebd43e )

by Rafael S.

created 2019-08-13 15:05 UTC

lib/wavefile-parser.js A

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Complexity

Total Complexity	41
Complexity/F	2.73

Size

Lines of Code	388
Function Count	15

Duplication

Duplicated Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
wmc	41
eloc	227
mnd	26
bc	26
fnc	15
dl	0
loc	388
rs	9.1199
bpm	1.7333
cpm	2.7333
noi	0
c	0
b	0
f	0

15 Functions

Rating	Name	Size	Complexity
A	WaveFileParser.getFmtExtensionBytes_	24	5
A	WaveFileParser.getLtxtChunkBytes_	13	1
A	WaveFileParser.getSmplLoopsBytes_	14	2
A	WaveFileParser.getCueBytes_	14	2
A	WaveFileParser.enforceBext_	13	5
A	WaveFileParser.getLISTBytes_	15	2
A	WaveFileParser.getCuePointsBytes_	14	2
A	WaveFileParser.getBextBytes_	29	2
A	WaveFileParser.getSmplBytes_	22	2
A	WaveFileParser.getJunkBytes_	11	2
A	WaveFileParser.getFmtBytes_	17	2
A	WaveFileParser.getDs64Bytes_	22	2
A	WaveFileParser.toBuffer	35	3
A	WaveFileParser.getFactBytes_	11	2
B	WaveFileParser.getLISTSubChunksBytes_	33	7

How to fix Complexity

/*
 * 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 WaveFileParser class.
 * @see https://github.com/rochars/wavefile
 */

/** @module wavefile */

import WaveFileReader from './wavefile-reader';
import writeString from './write-string';
import {packTo, packStringTo, packString, pack} from 'byte-data';

/**
 * A class to read and write wav files.
 * @extends WaveFileReader
 */
export default class WaveFileParser extends WaveFileReader {

  /**
   * Return a byte buffer representig the WaveFileParser object as a .wav file.
   * The return value of this method can be written straight to disk.
   * @return {!Uint8Array} A wav file.
   */
  toBuffer() {
    this.uInt16.be = this.container === 'RIFX';
    this.uInt32.be = this.uInt16.be;
    /** @type {!Array<!Array<number>>} */
    let fileBody = [
      this.getJunkBytes_(),
      this.getDs64Bytes_(),
      this.getBextBytes_(),
      this.getFmtBytes_(),
      this.getFactBytes_(),
      packString(this.data.chunkId),
      pack(this.data.samples.length, this.uInt32),
      this.data.samples,
      this.getCueBytes_(),
      this.getSmplBytes_(),
      this.getLISTBytes_()
    ];
    /** @type {number} */
    let fileBodyLength = 0;
    for (let i=0; i<fileBody.length; i++) {
      fileBodyLength += fileBody[i].length;
    }
    /** @type {!Uint8Array} */
    let file = new Uint8Array(fileBodyLength + 12);
    /** @type {number} */
    let index = 0;
    index = packStringTo(this.container, file, index);
    index = packTo(fileBodyLength + 4, this.uInt32, file, index);
    index = packStringTo(this.format, file, index);
    for (let i=0; i<fileBody.length; i++) {
      file.set(fileBody[i], index);
      index += fileBody[i].length;
    }
    return file;
  }

  /**
   * Return the bytes of the 'bext' chunk.
   * @private
   */
  getBextBytes_() {
    /** @type {!Array<number>} */
    let bytes = [];
    this.enforceBext_();
    if (this.bext.chunkId) {
      this.bext.chunkSize = 602 + this.bext.codingHistory.length;
      bytes = bytes.concat(
        packString(this.bext.chunkId),
        pack(602 + this.bext.codingHistory.length, this.uInt32),
        writeString(this.bext.description, 256),
        writeString(this.bext.originator, 32),
        writeString(this.bext.originatorReference, 32),
        writeString(this.bext.originationDate, 10),
        writeString(this.bext.originationTime, 8),
        pack(this.bext.timeReference[0], this.uInt32),
        pack(this.bext.timeReference[1], this.uInt32),
        pack(this.bext.version, this.uInt16),
        writeString(this.bext.UMID, 64),
        pack(this.bext.loudnessValue, this.uInt16),
        pack(this.bext.loudnessRange, this.uInt16),
        pack(this.bext.maxTruePeakLevel, this.uInt16),
        pack(this.bext.maxMomentaryLoudness, this.uInt16),
        pack(this.bext.maxShortTermLoudness, this.uInt16),
        writeString(this.bext.reserved, 180),
        writeString(
          this.bext.codingHistory, this.bext.codingHistory.length));
    }
    return bytes;
  }

  /**
   * Make sure a 'bext' chunk is created if BWF data was created in a file.
   * @private
   */
  enforceBext_() {
    for (let prop in this.bext) {
      if (this.bext.hasOwnProperty(prop)) {
        if (this.bext[prop] && prop != 'timeReference') {
          this.bext.chunkId = 'bext';
          break;
        }
      }
    }
    if (this.bext.timeReference[0] || this.bext.timeReference[1]) {
      this.bext.chunkId = 'bext';
    }
  }

  /**
   * Return the bytes of the 'ds64' chunk.
   * @return {!Array<number>} The 'ds64' chunk bytes.
   * @private
   */
  getDs64Bytes_() {
    /** @type {!Array<number>} */
    let bytes = [];
    if (this.ds64.chunkId) {
      bytes = bytes.concat(
        packString(this.ds64.chunkId),
        pack(this.ds64.chunkSize, this.uInt32),
        pack(this.ds64.riffSizeHigh, this.uInt32),
        pack(this.ds64.riffSizeLow, this.uInt32),
        pack(this.ds64.dataSizeHigh, this.uInt32),
        pack(this.ds64.dataSizeLow, this.uInt32),
        pack(this.ds64.originationTime, this.uInt32),
        pack(this.ds64.sampleCountHigh, this.uInt32),
        pack(this.ds64.sampleCountLow, this.uInt32));
    }
    //if (this.ds64.tableLength) {
    //  ds64Bytes = ds64Bytes.concat(
    //    pack(this.ds64.tableLength, this.uInt32),
    //    this.ds64.table);
    //}
    return bytes;
  }

  /**
   * Return the bytes of the 'cue ' chunk.
   * @return {!Array<number>} The 'cue ' chunk bytes.
   * @private
   */
  getCueBytes_() {
    /** @type {!Array<number>} */
    let bytes = [];
    if (this.cue.chunkId) {
      /** @type {!Array<number>} */
      let cuePointsBytes = this.getCuePointsBytes_();
      bytes = bytes.concat(
        packString(this.cue.chunkId),
        pack(cuePointsBytes.length + 4, this.uInt32),
        pack(this.cue.dwCuePoints, this.uInt32),
        cuePointsBytes);
    }
    return bytes;
  }

  /**
   * Return the bytes of the 'cue ' points.
   * @return {!Array<number>} The 'cue ' points as an array of bytes.
   * @private
   */
  getCuePointsBytes_() {
    /** @type {!Array<number>} */
    let points = [];
    for (let i=0; i<this.cue.dwCuePoints; i++) {
      points = points.concat(
        pack(this.cue.points[i].dwName, this.uInt32),
        pack(this.cue.points[i].dwPosition, this.uInt32),
        packString(this.cue.points[i].fccChunk),
        pack(this.cue.points[i].dwChunkStart, this.uInt32),
        pack(this.cue.points[i].dwBlockStart, this.uInt32),
        pack(this.cue.points[i].dwSampleOffset, this.uInt32));
    }
    return points;
  }

  /**
   * Return the bytes of the 'smpl' chunk.
   * @return {!Array<number>} The 'smpl' chunk bytes.
   * @private
   */
  getSmplBytes_() {
    /** @type {!Array<number>} */
    let bytes = [];
    if (this.smpl.chunkId) {
      /** @type {!Array<number>} */
      let smplLoopsBytes = this.getSmplLoopsBytes_();
      bytes = bytes.concat(
        packString(this.smpl.chunkId),
        pack(smplLoopsBytes.length + 36, this.uInt32),
        pack(this.smpl.dwManufacturer, this.uInt32),
        pack(this.smpl.dwProduct, this.uInt32),
        pack(this.smpl.dwSamplePeriod, this.uInt32),
        pack(this.smpl.dwMIDIUnityNote, this.uInt32),
        pack(this.smpl.dwMIDIPitchFraction, this.uInt32),
        pack(this.smpl.dwSMPTEFormat, this.uInt32),
        pack(this.smpl.dwSMPTEOffset, this.uInt32),
        pack(this.smpl.dwNumSampleLoops, this.uInt32),
        pack(this.smpl.dwSamplerData, this.uInt32),
        smplLoopsBytes);
    }
    return bytes;
  }

  /**
   * Return the bytes of the 'smpl' loops.
   * @return {!Array<number>} The 'smpl' loops as an array of bytes.
   * @private
   */
  getSmplLoopsBytes_() {
    /** @type {!Array<number>} */
    let loops = [];
    for (let i=0; i<this.smpl.dwNumSampleLoops; i++) {
      loops = loops.concat(
        pack(this.smpl.loops[i].dwName, this.uInt32),
        pack(this.smpl.loops[i].dwType, this.uInt32),
        pack(this.smpl.loops[i].dwStart, this.uInt32),
        pack(this.smpl.loops[i].dwEnd, this.uInt32),
        pack(this.smpl.loops[i].dwFraction, this.uInt32),
        pack(this.smpl.loops[i].dwPlayCount, this.uInt32));
    }
    return loops;
  }

  /**
   * Return the bytes of the 'fact' chunk.
   * @return {!Array<number>} The 'fact' chunk bytes.
   * @private
   */
  getFactBytes_() {
    /** @type {!Array<number>} */
    let bytes = [];
    if (this.fact.chunkId) {
      bytes = bytes.concat(
        packString(this.fact.chunkId),
        pack(this.fact.chunkSize, this.uInt32),
        pack(this.fact.dwSampleLength, this.uInt32));
    }
    return bytes;
  }

  /**
   * Return the bytes of the 'fmt ' chunk.
   * @return {!Array<number>} The 'fmt' chunk bytes.
   * @throws {Error} if no 'fmt ' chunk is present.
   * @private
   */
  getFmtBytes_() {
    /** @type {!Array<number>} */
    let fmtBytes = [];
    if (this.fmt.chunkId) {
      return fmtBytes.concat(
        packString(this.fmt.chunkId),
        pack(this.fmt.chunkSize, this.uInt32),
        pack(this.fmt.audioFormat, this.uInt16),
        pack(this.fmt.numChannels, this.uInt16),
        pack(this.fmt.sampleRate, this.uInt32),
        pack(this.fmt.byteRate, this.uInt32),
        pack(this.fmt.blockAlign, this.uInt16),
        pack(this.fmt.bitsPerSample, this.uInt16),
        this.getFmtExtensionBytes_());
    }
    throw Error('Could not find the "fmt " chunk');
  }

  /**
   * Return the bytes of the fmt extension fields.
   * @return {!Array<number>} The fmt extension bytes.
   * @private
   */
  getFmtExtensionBytes_() {
    /** @type {!Array<number>} */
    let extension = [];
    if (this.fmt.chunkSize > 16) {
      extension = extension.concat(
        pack(this.fmt.cbSize, this.uInt16));
    }
    if (this.fmt.chunkSize > 18) {
      extension = extension.concat(
        pack(this.fmt.validBitsPerSample, this.uInt16));
    }
    if (this.fmt.chunkSize > 20) {
      extension = extension.concat(
        pack(this.fmt.dwChannelMask, this.uInt32));
    }
    if (this.fmt.chunkSize > 24) {
      extension = extension.concat(
        pack(this.fmt.subformat[0], this.uInt32),
        pack(this.fmt.subformat[1], this.uInt32),
        pack(this.fmt.subformat[2], this.uInt32),
        pack(this.fmt.subformat[3], this.uInt32));
    }
    return extension;
  }

  /**
   * Return the bytes of the 'LIST' chunk.
   * @return {!Array<number>} The 'LIST' chunk bytes.
   * @private
   */
  getLISTBytes_() {
    /** @type {!Array<number>} */
    let bytes = [];
    for (let i=0; i<this.LIST.length; i++) {
      /** @type {!Array<number>} */
      let subChunksBytes = this.getLISTSubChunksBytes_(
          this.LIST[i].subChunks, this.LIST[i].format);
      bytes = bytes.concat(
        packString(this.LIST[i].chunkId),
        pack(subChunksBytes.length + 4, this.uInt32),
        packString(this.LIST[i].format),
        subChunksBytes);
    }
    return bytes;
  }

  /**
   * Return the bytes of the sub chunks of a 'LIST' chunk.
   * @param {!Array<!Object>} subChunks The 'LIST' sub chunks.
   * @param {string} format The format of the 'LIST' chunk.
   *    Currently supported values are 'adtl' or 'INFO'.
   * @return {!Array<number>} The sub chunk bytes.
   * @private
   */
  getLISTSubChunksBytes_(subChunks, format) {
    /** @type {!Array<number>} */
    let bytes = [];
    for (let i=0; i<subChunks.length; i++) {
      if (format == 'INFO') {
        bytes = bytes.concat(
          packString(subChunks[i].chunkId),
          pack(subChunks[i].value.length + 1, this.uInt32),
          writeString(
            subChunks[i].value, subChunks[i].value.length));
        bytes.push(0);
      } else if (format == 'adtl') {
        if (['labl', 'note'].indexOf(subChunks[i].chunkId) > -1) {
          bytes = bytes.concat(
            packString(subChunks[i].chunkId),
            pack(
              subChunks[i].value.length + 4 + 1, this.uInt32),
            pack(subChunks[i].dwName, this.uInt32),
            writeString(
              subChunks[i].value,
              subChunks[i].value.length));
          bytes.push(0);
        } else if (subChunks[i].chunkId == 'ltxt') {
          bytes = bytes.concat(
            this.getLtxtChunkBytes_(subChunks[i]));
        }
      }
      if (bytes.length % 2) {
        bytes.push(0);
      }
    }
    return bytes;
  }

  /**
   * Return the bytes of a 'ltxt' chunk.
   * @param {!Object} ltxt the 'ltxt' chunk.
   * @private
   */
  getLtxtChunkBytes_(ltxt) {
    return [].concat(
      packString(ltxt.chunkId),
      pack(ltxt.value.length + 20, this.uInt32),
      pack(ltxt.dwName, this.uInt32),
      pack(ltxt.dwSampleLength, this.uInt32),
      pack(ltxt.dwPurposeID, this.uInt32),
      pack(ltxt.dwCountry, this.uInt16),
      pack(ltxt.dwLanguage, this.uInt16),
      pack(ltxt.dwDialect, this.uInt16),
      pack(ltxt.dwCodePage, this.uInt16),
      writeString(ltxt.value, ltxt.value.length));
  }

  /**
   * Return the bytes of the 'junk' chunk.
   * @private
   */
  getJunkBytes_() {
    /** @type {!Array<number>} */
    let bytes = [];
    if (this.junk.chunkId) {
      return bytes.concat(
        packString(this.junk.chunkId),
        pack(this.junk.chunkData.length, this.uInt32),
        this.junk.chunkData);
    }
    return bytes;
  }
}


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 WaveFileParser class.
27			* @see https://github.com/rochars/wavefile
28			*/
29
30			/** @module wavefile */
31
32			import WaveFileReader from './wavefile-reader';
33			import writeString from './write-string';
34			import {packTo, packStringTo, packString, pack} from 'byte-data';
35
36			/**
37			* A class to read and write wav files.
38			* @extends WaveFileReader
39			*/
40			export default class WaveFileParser extends WaveFileReader {
41
42			/**
43			* Return a byte buffer representig the WaveFileParser object as a .wav file.
44			* The return value of this method can be written straight to disk.
45			* @return {!Uint8Array} A wav file.
46			*/
47			toBuffer() {
48			this.uInt16.be = this.container === 'RIFX';
49			this.uInt32.be = this.uInt16.be;
50			/** @type {!Array<!Array<number>>} */
51			let fileBody = [
52			this.getJunkBytes_(),
53			this.getDs64Bytes_(),
54			this.getBextBytes_(),
55			this.getFmtBytes_(),
56			this.getFactBytes_(),
57			packString(this.data.chunkId),
58			pack(this.data.samples.length, this.uInt32),
59			this.data.samples,
60			this.getCueBytes_(),
61			this.getSmplBytes_(),
62			this.getLISTBytes_()
63			];
64			/** @type {number} */
65			let fileBodyLength = 0;
66			for (let i=0; i<fileBody.length; i++) {
67			fileBodyLength += fileBody[i].length;
68			}
69			/** @type {!Uint8Array} */
70			let file = new Uint8Array(fileBodyLength + 12);
71			/** @type {number} */
72			let index = 0;
73			index = packStringTo(this.container, file, index);
74			index = packTo(fileBodyLength + 4, this.uInt32, file, index);
75			index = packStringTo(this.format, file, index);
76			for (let i=0; i<fileBody.length; i++) {
77			file.set(fileBody[i], index);
78			index += fileBody[i].length;
79			}
80			return file;
81			}
82
83			/**
84			* Return the bytes of the 'bext' chunk.
85			* @private
86			*/
87			getBextBytes_() {
88			/** @type {!Array<number>} */
89			let bytes = [];
90			this.enforceBext_();
91			if (this.bext.chunkId) {
92			this.bext.chunkSize = 602 + this.bext.codingHistory.length;
93			bytes = bytes.concat(
94			packString(this.bext.chunkId),
95			pack(602 + this.bext.codingHistory.length, this.uInt32),
96			writeString(this.bext.description, 256),
97			writeString(this.bext.originator, 32),
98			writeString(this.bext.originatorReference, 32),
99			writeString(this.bext.originationDate, 10),
100			writeString(this.bext.originationTime, 8),
101			pack(this.bext.timeReference[0], this.uInt32),
102			pack(this.bext.timeReference[1], this.uInt32),
103			pack(this.bext.version, this.uInt16),
104			writeString(this.bext.UMID, 64),
105			pack(this.bext.loudnessValue, this.uInt16),
106			pack(this.bext.loudnessRange, this.uInt16),
107			pack(this.bext.maxTruePeakLevel, this.uInt16),
108			pack(this.bext.maxMomentaryLoudness, this.uInt16),
109			pack(this.bext.maxShortTermLoudness, this.uInt16),
110			writeString(this.bext.reserved, 180),
111			writeString(
112			this.bext.codingHistory, this.bext.codingHistory.length));
113			}
114			return bytes;
115			}
116
117			/**
118			* Make sure a 'bext' chunk is created if BWF data was created in a file.
119			* @private
120			*/
121			enforceBext_() {
122			for (let prop in this.bext) {
123			if (this.bext.hasOwnProperty(prop)) {
124			if (this.bext[prop] && prop != 'timeReference') {
125			this.bext.chunkId = 'bext';
126			break;
127			}
128			}
129			}
130			if (this.bext.timeReference[0] \|\| this.bext.timeReference[1]) {
131			this.bext.chunkId = 'bext';
132			}
133			}
134
135			/**
136			* Return the bytes of the 'ds64' chunk.
137			* @return {!Array<number>} The 'ds64' chunk bytes.
138			* @private
139			*/
140			getDs64Bytes_() {
141			/** @type {!Array<number>} */
142			let bytes = [];
143			if (this.ds64.chunkId) {
144			bytes = bytes.concat(
145			packString(this.ds64.chunkId),
146			pack(this.ds64.chunkSize, this.uInt32),
147			pack(this.ds64.riffSizeHigh, this.uInt32),
148			pack(this.ds64.riffSizeLow, this.uInt32),
149			pack(this.ds64.dataSizeHigh, this.uInt32),
150			pack(this.ds64.dataSizeLow, this.uInt32),
151			pack(this.ds64.originationTime, this.uInt32),
152			pack(this.ds64.sampleCountHigh, this.uInt32),
153			pack(this.ds64.sampleCountLow, this.uInt32));
154			}
155			//if (this.ds64.tableLength) {
156			// ds64Bytes = ds64Bytes.concat(
157			// pack(this.ds64.tableLength, this.uInt32),
158			// this.ds64.table);
159			//}
160			return bytes;
161			}
162
163			/**
164			* Return the bytes of the 'cue ' chunk.
165			* @return {!Array<number>} The 'cue ' chunk bytes.
166			* @private
167			*/
168			getCueBytes_() {
169			/** @type {!Array<number>} */
170			let bytes = [];
171			if (this.cue.chunkId) {
172			/** @type {!Array<number>} */
173			let cuePointsBytes = this.getCuePointsBytes_();
174			bytes = bytes.concat(
175			packString(this.cue.chunkId),
176			pack(cuePointsBytes.length + 4, this.uInt32),
177			pack(this.cue.dwCuePoints, this.uInt32),
178			cuePointsBytes);
179			}
180			return bytes;
181			}
182
183			/**
184			* Return the bytes of the 'cue ' points.
185			* @return {!Array<number>} The 'cue ' points as an array of bytes.
186			* @private
187			*/
188			getCuePointsBytes_() {
189			/** @type {!Array<number>} */
190			let points = [];
191			for (let i=0; i<this.cue.dwCuePoints; i++) {
192			points = points.concat(
193			pack(this.cue.points[i].dwName, this.uInt32),
194			pack(this.cue.points[i].dwPosition, this.uInt32),
195			packString(this.cue.points[i].fccChunk),
196			pack(this.cue.points[i].dwChunkStart, this.uInt32),
197			pack(this.cue.points[i].dwBlockStart, this.uInt32),
198			pack(this.cue.points[i].dwSampleOffset, this.uInt32));
199			}
200			return points;
201			}
202
203			/**
204			* Return the bytes of the 'smpl' chunk.
205			* @return {!Array<number>} The 'smpl' chunk bytes.
206			* @private
207			*/
208			getSmplBytes_() {
209			/** @type {!Array<number>} */
210			let bytes = [];
211			if (this.smpl.chunkId) {
212			/** @type {!Array<number>} */
213			let smplLoopsBytes = this.getSmplLoopsBytes_();
214			bytes = bytes.concat(
215			packString(this.smpl.chunkId),
216			pack(smplLoopsBytes.length + 36, this.uInt32),
217			pack(this.smpl.dwManufacturer, this.uInt32),
218			pack(this.smpl.dwProduct, this.uInt32),
219			pack(this.smpl.dwSamplePeriod, this.uInt32),
220			pack(this.smpl.dwMIDIUnityNote, this.uInt32),
221			pack(this.smpl.dwMIDIPitchFraction, this.uInt32),
222			pack(this.smpl.dwSMPTEFormat, this.uInt32),
223			pack(this.smpl.dwSMPTEOffset, this.uInt32),
224			pack(this.smpl.dwNumSampleLoops, this.uInt32),
225			pack(this.smpl.dwSamplerData, this.uInt32),
226			smplLoopsBytes);
227			}
228			return bytes;
229			}
230
231			/**
232			* Return the bytes of the 'smpl' loops.
233			* @return {!Array<number>} The 'smpl' loops as an array of bytes.
234			* @private
235			*/
236			getSmplLoopsBytes_() {
237			/** @type {!Array<number>} */
238			let loops = [];
239			for (let i=0; i<this.smpl.dwNumSampleLoops; i++) {
240			loops = loops.concat(
241			pack(this.smpl.loops[i].dwName, this.uInt32),
242			pack(this.smpl.loops[i].dwType, this.uInt32),
243			pack(this.smpl.loops[i].dwStart, this.uInt32),
244			pack(this.smpl.loops[i].dwEnd, this.uInt32),
245			pack(this.smpl.loops[i].dwFraction, this.uInt32),
246			pack(this.smpl.loops[i].dwPlayCount, this.uInt32));
247			}
248			return loops;
249			}
250
251			/**
252			* Return the bytes of the 'fact' chunk.
253			* @return {!Array<number>} The 'fact' chunk bytes.
254			* @private
255			*/
256			getFactBytes_() {
257			/** @type {!Array<number>} */
258			let bytes = [];
259			if (this.fact.chunkId) {
260			bytes = bytes.concat(
261			packString(this.fact.chunkId),
262			pack(this.fact.chunkSize, this.uInt32),
263			pack(this.fact.dwSampleLength, this.uInt32));
264			}
265			return bytes;
266			}
267
268			/**
269			* Return the bytes of the 'fmt ' chunk.
270			* @return {!Array<number>} The 'fmt' chunk bytes.
271			* @throws {Error} if no 'fmt ' chunk is present.
272			* @private
273			*/
274			getFmtBytes_() {
275			/** @type {!Array<number>} */
276			let fmtBytes = [];
277			if (this.fmt.chunkId) {
278			return fmtBytes.concat(
279			packString(this.fmt.chunkId),
280			pack(this.fmt.chunkSize, this.uInt32),
281			pack(this.fmt.audioFormat, this.uInt16),
282			pack(this.fmt.numChannels, this.uInt16),
283			pack(this.fmt.sampleRate, this.uInt32),
284			pack(this.fmt.byteRate, this.uInt32),
285			pack(this.fmt.blockAlign, this.uInt16),
286			pack(this.fmt.bitsPerSample, this.uInt16),
287			this.getFmtExtensionBytes_());
288			}
289			throw Error('Could not find the "fmt " chunk');
290			}
291
292			/**
293			* Return the bytes of the fmt extension fields.
294			* @return {!Array<number>} The fmt extension bytes.
295			* @private
296			*/
297			getFmtExtensionBytes_() {
298			/** @type {!Array<number>} */
299			let extension = [];
300			if (this.fmt.chunkSize > 16) {
301			extension = extension.concat(
302			pack(this.fmt.cbSize, this.uInt16));
303			}
304			if (this.fmt.chunkSize > 18) {
305			extension = extension.concat(
306			pack(this.fmt.validBitsPerSample, this.uInt16));
307			}
308			if (this.fmt.chunkSize > 20) {
309			extension = extension.concat(
310			pack(this.fmt.dwChannelMask, this.uInt32));
311			}
312			if (this.fmt.chunkSize > 24) {
313			extension = extension.concat(
314			pack(this.fmt.subformat[0], this.uInt32),
315			pack(this.fmt.subformat[1], this.uInt32),
316			pack(this.fmt.subformat[2], this.uInt32),
317			pack(this.fmt.subformat[3], this.uInt32));
318			}
319			return extension;
320			}
321
322			/**
323			* Return the bytes of the 'LIST' chunk.
324			* @return {!Array<number>} The 'LIST' chunk bytes.
325			* @private
326			*/
327			getLISTBytes_() {
328			/** @type {!Array<number>} */
329			let bytes = [];
330			for (let i=0; i<this.LIST.length; i++) {
331			/** @type {!Array<number>} */
332			let subChunksBytes = this.getLISTSubChunksBytes_(
333			this.LIST[i].subChunks, this.LIST[i].format);
334			bytes = bytes.concat(
335			packString(this.LIST[i].chunkId),
336			pack(subChunksBytes.length + 4, this.uInt32),
337			packString(this.LIST[i].format),
338			subChunksBytes);
339			}
340			return bytes;
341			}
342
343			/**
344			* Return the bytes of the sub chunks of a 'LIST' chunk.
345			* @param {!Array<!Object>} subChunks The 'LIST' sub chunks.
346			* @param {string} format The format of the 'LIST' chunk.
347			* Currently supported values are 'adtl' or 'INFO'.
348			* @return {!Array<number>} The sub chunk bytes.
349			* @private
350			*/
351			getLISTSubChunksBytes_(subChunks, format) {
352			/** @type {!Array<number>} */
353			let bytes = [];
354			for (let i=0; i<subChunks.length; i++) {
355			if (format == 'INFO') {
356			bytes = bytes.concat(
357			packString(subChunks[i].chunkId),
358			pack(subChunks[i].value.length + 1, this.uInt32),
359			writeString(
360			subChunks[i].value, subChunks[i].value.length));
361			bytes.push(0);
362			} else if (format == 'adtl') {
363			if (['labl', 'note'].indexOf(subChunks[i].chunkId) > -1) {
364			bytes = bytes.concat(
365			packString(subChunks[i].chunkId),
366			pack(
367			subChunks[i].value.length + 4 + 1, this.uInt32),
368			pack(subChunks[i].dwName, this.uInt32),
369			writeString(
370			subChunks[i].value,
371			subChunks[i].value.length));
372			bytes.push(0);
373			} else if (subChunks[i].chunkId == 'ltxt') {
374			bytes = bytes.concat(
375			this.getLtxtChunkBytes_(subChunks[i]));
376			}
377			}
378			if (bytes.length % 2) {
379			bytes.push(0);
380			}
381			}
382			return bytes;
383			}
384
385			/**
386			* Return the bytes of a 'ltxt' chunk.
387			* @param {!Object} ltxt the 'ltxt' chunk.
388			* @private
389			*/
390			getLtxtChunkBytes_(ltxt) {
391			return [].concat(
392			packString(ltxt.chunkId),
393			pack(ltxt.value.length + 20, this.uInt32),
394			pack(ltxt.dwName, this.uInt32),
395			pack(ltxt.dwSampleLength, this.uInt32),
396			pack(ltxt.dwPurposeID, this.uInt32),
397			pack(ltxt.dwCountry, this.uInt16),
398			pack(ltxt.dwLanguage, this.uInt16),
399			pack(ltxt.dwDialect, this.uInt16),
400			pack(ltxt.dwCodePage, this.uInt16),
401			writeString(ltxt.value, ltxt.value.length));
402			}
403
404			/**
405			* Return the bytes of the 'junk' chunk.
406			* @private
407			*/
408			getJunkBytes_() {
409			/** @type {!Array<number>} */
410			let bytes = [];
411			if (this.junk.chunkId) {
412			return bytes.concat(
413			packString(this.junk.chunkId),
414			pack(this.junk.chunkData.length, this.uInt32),
415			this.junk.chunkData);
416			}
417			return bytes;
418			}
419			}
420

rochars / wavefile

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lib/wavefile-parser.js A

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