WaveFileParser.getBextBytes_ - Code Metrics - Inspection of "Enforce even byte len on all chunks" - rochars/wavefile - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Branch — v9.1.x (22fd25)

by Rafael S.

created 2020-01-03 09:03 UTC

WaveFileParser.getBextBytes_ A

↳ Parent: WaveFileParser

Complexity

Conditions

Size

Total Lines	30
Code Lines	27

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
eloc	27
dl	0
loc	30
rs	9.232
c	0
b	0
f	0
cc	2

/*
 * 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
 */

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 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.getiXMLBytes_(),
      this.getFmtBytes_(),
      this.getFactBytes_(),
      packString(this.data.chunkId),
      pack(this.data.samples.length, this.uInt32),
      this.data.samples,
      this.getCueBytes_(),
      this.getSmplBytes_(),
      this.getLISTBytes_(),
      this.get_PMXBytes_()
    ];
    /** @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));
    }
    this.enforceByteLen_(bytes);
    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 'iXML' chunk.
   * @return {!Array<number>} The 'iXML' chunk bytes.
   * @private
   */
  getiXMLBytes_() {
    /** @type {!Array<number>} */
    let bytes = [];
    if (this.iXML.chunkId) {
      bytes = bytes.concat(
        packString(this.iXML.chunkId),
        pack(this.iXML.chunkSize, this.uInt32),
        packString(this.iXML.value));
    }
    this.enforceByteLen_(bytes);
    return bytes;
  }

  /**
   * 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);
    //}
    this.enforceByteLen_(bytes);
    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);
    }
    this.enforceByteLen_(bytes);
    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);
    }
    this.enforceByteLen_(bytes);
    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));
    }
    this.enforceByteLen_(bytes);
    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) {
      let bytes  = 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_());
      this.enforceByteLen_(bytes);
      return bytes;
    }
    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);
    }
    this.enforceByteLen_(bytes);
    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]));
        }
      }
      this.enforceByteLen_(bytes);
    }
    return bytes;
  }

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

  /**
   * Push a null byte into a byte array if
   * the byte count is odd.
   * @param {!Array<number>} bytes The byte array.
   * @private
   */
  enforceByteLen_(bytes) {
    if (bytes.length % 2) {
      bytes.push(0);
    }
  }
}


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			import { WaveFileReader } from './wavefile-reader';
31			import writeString from './write-string';
32			import { packTo, packStringTo, packString, pack } from 'byte-data';
33
34			/**
35			* A class to read and write wav files.
36			* @extends WaveFileReader
37			*/
38			export class WaveFileParser extends WaveFileReader {
39
40			/**
41			* Return a byte buffer representig the WaveFileParser object as a .wav file.
42			* The return value of this method can be written straight to disk.
43			* @return {!Uint8Array} A wav file.
44			*/
45			toBuffer() {
46			this.uInt16.be = this.container === 'RIFX';
47			this.uInt32.be = this.uInt16.be;
48			/** @type {!Array<!Array<number>>} */
49			let fileBody = [
50			this.getJunkBytes_(),
51			this.getDs64Bytes_(),
52			this.getBextBytes_(),
53			this.getiXMLBytes_(),
54			this.getFmtBytes_(),
55			this.getFactBytes_(),
56			packString(this.data.chunkId),
57			pack(this.data.samples.length, this.uInt32),
58			this.data.samples,
59			this.getCueBytes_(),
60			this.getSmplBytes_(),
61			this.getLISTBytes_(),
62			this.get_PMXBytes_()
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			this.enforceByteLen_(bytes);
115			return bytes;
116			}
117
118			/**
119			* Make sure a 'bext' chunk is created if BWF data was created in a file.
120			* @private
121			*/
122			enforceBext_() {
123			for (let prop in this.bext) {
124			if (this.bext.hasOwnProperty(prop)) {
125			if (this.bext[prop] && prop != 'timeReference') {
126			this.bext.chunkId = 'bext';
127			break;
128			}
129			}
130			}
131			if (this.bext.timeReference[0] \|\| this.bext.timeReference[1]) {
132			this.bext.chunkId = 'bext';
133			}
134			}
135
136			/**
137			* Return the bytes of the 'iXML' chunk.
138			* @return {!Array<number>} The 'iXML' chunk bytes.
139			* @private
140			*/
141			getiXMLBytes_() {
142			/** @type {!Array<number>} */
143			let bytes = [];
144			if (this.iXML.chunkId) {
145			bytes = bytes.concat(
146			packString(this.iXML.chunkId),
147			pack(this.iXML.chunkSize, this.uInt32),
148			packString(this.iXML.value));
149			}
150			this.enforceByteLen_(bytes);
151			return bytes;
152			}
153
154			/**
155			* Return the bytes of the 'ds64' chunk.
156			* @return {!Array<number>} The 'ds64' chunk bytes.
157			* @private
158			*/
159			getDs64Bytes_() {
160			/** @type {!Array<number>} */
161			let bytes = [];
162			if (this.ds64.chunkId) {
163			bytes = bytes.concat(
164			packString(this.ds64.chunkId),
165			pack(this.ds64.chunkSize, this.uInt32),
166			pack(this.ds64.riffSizeHigh, this.uInt32),
167			pack(this.ds64.riffSizeLow, this.uInt32),
168			pack(this.ds64.dataSizeHigh, this.uInt32),
169			pack(this.ds64.dataSizeLow, this.uInt32),
170			pack(this.ds64.originationTime, this.uInt32),
171			pack(this.ds64.sampleCountHigh, this.uInt32),
172			pack(this.ds64.sampleCountLow, this.uInt32));
173			}
174			//if (this.ds64.tableLength) {
175			// ds64Bytes = ds64Bytes.concat(
176			// pack(this.ds64.tableLength, this.uInt32),
177			// this.ds64.table);
178			//}
179			this.enforceByteLen_(bytes);
180			return bytes;
181			}
182
183			/**
184			* Return the bytes of the 'cue ' chunk.
185			* @return {!Array<number>} The 'cue ' chunk bytes.
186			* @private
187			*/
188			getCueBytes_() {
189			/** @type {!Array<number>} */
190			let bytes = [];
191			if (this.cue.chunkId) {
192			/** @type {!Array<number>} */
193			let cuePointsBytes = this.getCuePointsBytes_();
194			bytes = bytes.concat(
195			packString(this.cue.chunkId),
196			pack(cuePointsBytes.length + 4, this.uInt32),
197			pack(this.cue.dwCuePoints, this.uInt32),
198			cuePointsBytes);
199			}
200			this.enforceByteLen_(bytes);
201			return bytes;
202			}
203
204			/**
205			* Return the bytes of the 'cue ' points.
206			* @return {!Array<number>} The 'cue ' points as an array of bytes.
207			* @private
208			*/
209			getCuePointsBytes_() {
210			/** @type {!Array<number>} */
211			let points = [];
212			for (let i=0; i<this.cue.dwCuePoints; i++) {
213			points = points.concat(
214			pack(this.cue.points[i].dwName, this.uInt32),
215			pack(this.cue.points[i].dwPosition, this.uInt32),
216			packString(this.cue.points[i].fccChunk),
217			pack(this.cue.points[i].dwChunkStart, this.uInt32),
218			pack(this.cue.points[i].dwBlockStart, this.uInt32),
219			pack(this.cue.points[i].dwSampleOffset, this.uInt32));
220			}
221			return points;
222			}
223
224			/**
225			* Return the bytes of the 'smpl' chunk.
226			* @return {!Array<number>} The 'smpl' chunk bytes.
227			* @private
228			*/
229			getSmplBytes_() {
230			/** @type {!Array<number>} */
231			let bytes = [];
232			if (this.smpl.chunkId) {
233			/** @type {!Array<number>} */
234			let smplLoopsBytes = this.getSmplLoopsBytes_();
235			bytes = bytes.concat(
236			packString(this.smpl.chunkId),
237			pack(smplLoopsBytes.length + 36, this.uInt32),
238			pack(this.smpl.dwManufacturer, this.uInt32),
239			pack(this.smpl.dwProduct, this.uInt32),
240			pack(this.smpl.dwSamplePeriod, this.uInt32),
241			pack(this.smpl.dwMIDIUnityNote, this.uInt32),
242			pack(this.smpl.dwMIDIPitchFraction, this.uInt32),
243			pack(this.smpl.dwSMPTEFormat, this.uInt32),
244			pack(this.smpl.dwSMPTEOffset, this.uInt32),
245			pack(this.smpl.dwNumSampleLoops, this.uInt32),
246			pack(this.smpl.dwSamplerData, this.uInt32),
247			smplLoopsBytes);
248			}
249			this.enforceByteLen_(bytes);
250			return bytes;
251			}
252
253			/**
254			* Return the bytes of the 'smpl' loops.
255			* @return {!Array<number>} The 'smpl' loops as an array of bytes.
256			* @private
257			*/
258			getSmplLoopsBytes_() {
259			/** @type {!Array<number>} */
260			let loops = [];
261			for (let i=0; i<this.smpl.dwNumSampleLoops; i++) {
262			loops = loops.concat(
263			pack(this.smpl.loops[i].dwName, this.uInt32),
264			pack(this.smpl.loops[i].dwType, this.uInt32),
265			pack(this.smpl.loops[i].dwStart, this.uInt32),
266			pack(this.smpl.loops[i].dwEnd, this.uInt32),
267			pack(this.smpl.loops[i].dwFraction, this.uInt32),
268			pack(this.smpl.loops[i].dwPlayCount, this.uInt32));
269			}
270			return loops;
271			}
272
273			/**
274			* Return the bytes of the 'fact' chunk.
275			* @return {!Array<number>} The 'fact' chunk bytes.
276			* @private
277			*/
278			getFactBytes_() {
279			/** @type {!Array<number>} */
280			let bytes = [];
281			if (this.fact.chunkId) {
282			bytes = bytes.concat(
283			packString(this.fact.chunkId),
284			pack(this.fact.chunkSize, this.uInt32),
285			pack(this.fact.dwSampleLength, this.uInt32));
286			}
287			this.enforceByteLen_(bytes);
288			return bytes;
289			}
290
291			/**
292			* Return the bytes of the 'fmt ' chunk.
293			* @return {!Array<number>} The 'fmt' chunk bytes.
294			* @throws {Error} if no 'fmt ' chunk is present.
295			* @private
296			*/
297			getFmtBytes_() {
298			/** @type {!Array<number>} */
299			let fmtBytes = [];
300			if (this.fmt.chunkId) {
301			let bytes = fmtBytes.concat(
302			packString(this.fmt.chunkId),
303			pack(this.fmt.chunkSize, this.uInt32),
304			pack(this.fmt.audioFormat, this.uInt16),
305			pack(this.fmt.numChannels, this.uInt16),
306			pack(this.fmt.sampleRate, this.uInt32),
307			pack(this.fmt.byteRate, this.uInt32),
308			pack(this.fmt.blockAlign, this.uInt16),
309			pack(this.fmt.bitsPerSample, this.uInt16),
310			this.getFmtExtensionBytes_());
311			this.enforceByteLen_(bytes);
312			return bytes;
313			}
314			throw Error('Could not find the "fmt " chunk');
315			}
316
317			/**
318			* Return the bytes of the fmt extension fields.
319			* @return {!Array<number>} The fmt extension bytes.
320			* @private
321			*/
322			getFmtExtensionBytes_() {
323			/** @type {!Array<number>} */
324			let extension = [];
325			if (this.fmt.chunkSize > 16) {
326			extension = extension.concat(
327			pack(this.fmt.cbSize, this.uInt16));
328			}
329			if (this.fmt.chunkSize > 18) {
330			extension = extension.concat(
331			pack(this.fmt.validBitsPerSample, this.uInt16));
332			}
333			if (this.fmt.chunkSize > 20) {
334			extension = extension.concat(
335			pack(this.fmt.dwChannelMask, this.uInt32));
336			}
337			if (this.fmt.chunkSize > 24) {
338			extension = extension.concat(
339			pack(this.fmt.subformat[0], this.uInt32),
340			pack(this.fmt.subformat[1], this.uInt32),
341			pack(this.fmt.subformat[2], this.uInt32),
342			pack(this.fmt.subformat[3], this.uInt32));
343			}
344			return extension;
345			}
346
347			/**
348			* Return the bytes of the 'LIST' chunk.
349			* @return {!Array<number>} The 'LIST' chunk bytes.
350			* @private
351			*/
352			getLISTBytes_() {
353			/** @type {!Array<number>} */
354			let bytes = [];
355			for (let i=0; i<this.LIST.length; i++) {
356			/** @type {!Array<number>} */
357			let subChunksBytes = this.getLISTSubChunksBytes_(
358			this.LIST[i].subChunks, this.LIST[i].format);
359			bytes = bytes.concat(
360			packString(this.LIST[i].chunkId),
361			pack(subChunksBytes.length + 4, this.uInt32),
362			packString(this.LIST[i].format),
363			subChunksBytes);
364			}
365			this.enforceByteLen_(bytes);
366			return bytes;
367			}
368
369			/**
370			* Return the bytes of the sub chunks of a 'LIST' chunk.
371			* @param {!Array<!Object>} subChunks The 'LIST' sub chunks.
372			* @param {string} format The format of the 'LIST' chunk.
373			* Currently supported values are 'adtl' or 'INFO'.
374			* @return {!Array<number>} The sub chunk bytes.
375			* @private
376			*/
377			getLISTSubChunksBytes_(subChunks, format) {
378			/** @type {!Array<number>} */
379			let bytes = [];
380			for (let i=0; i<subChunks.length; i++) {
381			if (format == 'INFO') {
382			bytes = bytes.concat(
383			packString(subChunks[i].chunkId),
384			pack(subChunks[i].value.length + 1, this.uInt32),
385			writeString(
386			subChunks[i].value, subChunks[i].value.length));
387			bytes.push(0);
388			} else if (format == 'adtl') {
389			if (['labl', 'note'].indexOf(subChunks[i].chunkId) > -1) {
390			bytes = bytes.concat(
391			packString(subChunks[i].chunkId),
392			pack(
393			subChunks[i].value.length + 4 + 1, this.uInt32),
394			pack(subChunks[i].dwName, this.uInt32),
395			writeString(
396			subChunks[i].value,
397			subChunks[i].value.length));
398			bytes.push(0);
399			} else if (subChunks[i].chunkId == 'ltxt') {
400			bytes = bytes.concat(
401			this.getLtxtChunkBytes_(subChunks[i]));
402			}
403			}
404			this.enforceByteLen_(bytes);
405			}
406			return bytes;
407			}
408
409			/**
410			* Return the bytes of the '_PMX' chunk.
411			* @return {!Array<number>} The '_PMX' chunk bytes.
412			* @private
413			*/
414			get_PMXBytes_() {
415			/** @type {!Array<number>} */
416			let bytes = [];
417			if (this._PMX.chunkId) {
418			bytes = bytes.concat(
419			packString(this._PMX.chunkId),
420			pack(this._PMX.chunkSize, this.uInt32),
421			packString(this._PMX.value));
422			}
423			this.enforceByteLen_(bytes);
424			return bytes;
425			}
426
427			/**
428			* Return the bytes of a 'ltxt' chunk.
429			* @param {!Object} ltxt the 'ltxt' chunk.
430			* @private
431			*/
432			getLtxtChunkBytes_(ltxt) {
433			return [].concat(
434			packString(ltxt.chunkId),
435			pack(ltxt.value.length + 20, this.uInt32),
436			pack(ltxt.dwName, this.uInt32),
437			pack(ltxt.dwSampleLength, this.uInt32),
438			pack(ltxt.dwPurposeID, this.uInt32),
439			pack(ltxt.dwCountry, this.uInt16),
440			pack(ltxt.dwLanguage, this.uInt16),
441			pack(ltxt.dwDialect, this.uInt16),
442			pack(ltxt.dwCodePage, this.uInt16),
443			writeString(ltxt.value, ltxt.value.length));
444			}
445
446			/**
447			* Return the bytes of the 'junk' chunk.
448			* @private
449			*/
450			getJunkBytes_() {
451			/** @type {!Array<number>} */
452			let bytes = [];
453			if (this.junk.chunkId) {
454			return bytes.concat(
455			packString(this.junk.chunkId),
456			pack(this.junk.chunkData.length, this.uInt32),
457			this.junk.chunkData);
458			}
459			this.enforceByteLen_(bytes);
460			return bytes;
461			}
462
463			/**
464			* Push a null byte into a byte array if
465			* the byte count is odd.
466			* @param {!Array<number>} bytes The byte array.
467			* @private
468			*/
469			enforceByteLen_(bytes) {
470			if (bytes.length % 2) {
471			bytes.push(0);
472			}
473			}
474			}
475

rochars / wavefile

Branch — v9.1.x (22fd25)

WaveFileParser.getBextBytes_ A

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