lib/wav-buffer-reader.js - Code Metrics - Inspection of "Use prototypes of wav-buffer-reader and wav-buffer..." - rochars/wavefile - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Branch — v8.x (d6a5cf)

by Rafael S.

created 2018-07-10 23:52 UTC

lib/wav-buffer-reader.js A

↳ Parent: Project

Complexity

Total Complexity	42
Complexity/F	3

Size

Lines of Code	374
Function Count	14

Duplication

Duplicated Lines	0
Ratio	0 %

Importance

Changes	1
Bugs	0	Features	0

Metric	Value
cc	0
eloc	206
c	1
b	0
f	0
nc	1
dl	0
loc	374
rs	9.0399
wmc	42
mnd	3
bc	45
fnc	14
bpm	3.2142
cpm	3
noi	10

14 Functions

Rating	Name	Size	Complexity
A	wav-buffer-reader.js ➔ readLISTChunk_	20	4
A	wav-buffer-reader.js ➔ readJunkChunk_	13	2
A	wav-buffer-reader.js ➔ readFmtExtension_	16	4
A	wav-buffer-reader.js ➔ readDataChunk_	15	3
A	wav-buffer-reader.js ➔ readCueChunk_	20	3
A	wav-buffer-reader.js ➔ readSmplChunk_	28	3
A	wav-buffer-reader.js ➔ readFactChunk_	10	2
A	wav-buffer-reader.js ➔ readDs64Chunk_	26	3
B	wav-buffer-reader.js ➔ readLISTSubChunks_	31	5
A	wav-buffer-reader.js ➔ readFmtChunk_	18	2
A	wav-buffer-reader.js ➔ readBextChunk_	27	2
A	wav-buffer-reader.js ➔ readWavBuffer	16	1
A	wav-buffer-reader.js ➔ bitDepthFromFmt_	11	5
A	wav-buffer-reader.js ➔ readRIFFChunk_	14	3

How to fix Complexity

/*
 * Copyright (c) 2018 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 Get structured wav data out of buffers.
 * @see https://github.com/rochars/wavefile
 */

import {riffChunks, findChunk_} from '../vendor/riff-chunks.js';
import BufferIO from './bufferio.js';

let io = new BufferIO();

/**
 * Set up the WaveFile object from a byte buffer.
 * @param {!Uint8Array} buffer The buffer.
 * @param {boolean} samples True if the samples should be loaded.
 * @param {!Object} wav True if the samples should be loaded.
 * @param {!Object} uInt32_ True if the samples should be loaded.
 * @param {!Object} uInt16_ True if the samples should be loaded.
 * @throws {Error} If container is not RIFF, RIFX or RF64.
 * @throws {Error} If no 'fmt ' chunk is found.
 * @throws {Error} If no 'data' chunk is found.
 */
export default function readWavBuffer(buffer, samples, wav, uInt32_, uInt16_) {
  io.head_ = 0;
  readRIFFChunk_(buffer, wav, uInt32_, uInt16_);
  /** @type {!Object} */
  let chunk = riffChunks(buffer);
  readDs64Chunk_(buffer, chunk.subChunks, wav, uInt32_, uInt16_);
  readFmtChunk_(buffer, chunk.subChunks, wav, uInt32_, uInt16_);
  readFactChunk_(buffer, chunk.subChunks, wav, uInt32_, uInt16_);
  readBextChunk_(buffer, chunk.subChunks, wav, uInt32_, uInt16_);
  readCueChunk_(buffer, chunk.subChunks, wav, uInt32_, uInt16_);
  readSmplChunk_(buffer, chunk.subChunks, wav, uInt32_, uInt16_);
  readDataChunk_(buffer, chunk.subChunks, samples, wav, uInt32_, uInt16_);
  readJunkChunk_(buffer, chunk.subChunks, wav, uInt32_, uInt16_);
  readLISTChunk_(buffer, chunk.subChunks, wav, uInt32_, uInt16_);
  bitDepthFromFmt_(wav, uInt32_, uInt16_);
}

/**
 * Set the string code of the bit depth based on the 'fmt ' chunk.
 * @private
 */
function bitDepthFromFmt_(wav, uInt32_, uInt16_) {

  if (wav.fmt.audioFormat === 3 && wav.fmt.bitsPerSample === 32) {
    wav.bitDepth = '32f';
  } else if (wav.fmt.audioFormat === 6) {
    wav.bitDepth = '8a';
  } else if (wav.fmt.audioFormat === 7) {
    wav.bitDepth = '8m';
  } else {
    wav.bitDepth = wav.fmt.bitsPerSample.toString();
  }
}

/**
 * Read the RIFF chunk a wave file.
 * @param {!Uint8Array} bytes A wav buffer.
 * @throws {Error} If no 'RIFF' chunk is found.
 * @private
 */
function readRIFFChunk_(bytes, wav, uInt32_, uInt16_) {
  io.head_ = 0;
  wav.container = io.readString_(bytes, 4);
  if (['RIFF', 'RIFX', 'RF64'].indexOf(wav.container) === -1) {
    throw Error('Not a supported format.');
  }
  uInt16_.be = wav.container === 'RIFX';
  uInt32_.be = uInt16_.be;
  wav.chunkSize = io.read_(bytes, uInt32_);
  wav.format = io.readString_(bytes, 4);
  if (wav.format != 'WAVE') {
    throw Error('Could not find the "WAVE" format identifier');
  }
}

/**
 * Read the 'fmt ' chunk of a wave file.
 * @param {!Uint8Array} buffer The wav file buffer.
 * @param {!Object} signature The file signature.
 * @throws {Error} If no 'fmt ' chunk is found.
 * @private
 */
function readFmtChunk_(buffer, signature, wav, uInt32_, uInt16_) {
  /** @type {?Object} */
  let chunk = findChunk_(signature, 'fmt ');
  if (chunk) {
    io.head_ = chunk.chunkData.start;
    wav.fmt.chunkId = chunk.chunkId;
    wav.fmt.chunkSize = chunk.chunkSize;
    wav.fmt.audioFormat = io.read_(buffer, uInt16_);
    wav.fmt.numChannels = io.read_(buffer, uInt16_);
    wav.fmt.sampleRate = io.read_(buffer, uInt32_);
    wav.fmt.byteRate = io.read_(buffer, uInt32_);
    wav.fmt.blockAlign = io.read_(buffer, uInt16_);
    wav.fmt.bitsPerSample = io.read_(buffer, uInt16_);
    readFmtExtension_(buffer, wav, uInt32_, uInt16_);
  } else {
    throw Error('Could not find the "fmt " chunk');
  }
}

/**
 * Read the 'fmt ' chunk extension.
 * @param {!Uint8Array} buffer The wav file buffer.
 * @private
 */
function readFmtExtension_(buffer, wav, uInt32_, uInt16_) {
  if (wav.fmt.chunkSize > 16) {
    wav.fmt.cbSize = io.read_(buffer, uInt16_);
    if (wav.fmt.chunkSize > 18) {
      wav.fmt.validBitsPerSample = io.read_(buffer, uInt16_);
      if (wav.fmt.chunkSize > 20) {
        wav.fmt.dwChannelMask = io.read_(buffer, uInt32_);
        wav.fmt.subformat = [
          io.read_(buffer, uInt32_),
          io.read_(buffer, uInt32_),
          io.read_(buffer, uInt32_),
          io.read_(buffer, uInt32_)];
      }
    }
  }
}

/**
 * Read the 'fact' chunk of a wav file.
 * @param {!Uint8Array} buffer The wav file buffer.
 * @param {!Object} signature The file signature.
 * @private
 */
function readFactChunk_(buffer, signature, wav, uInt32_, uInt16_) {

  /** @type {?Object} */
  let chunk = findChunk_(signature, 'fact');
  if (chunk) {
    io.head_ = chunk.chunkData.start;
    wav.fact.chunkId = chunk.chunkId;
    wav.fact.chunkSize = chunk.chunkSize;
    wav.fact.dwSampleLength = io.read_(buffer, uInt32_);
  }
}

/**
 * Read the 'cue ' chunk of a wave file.
 * @param {!Uint8Array} buffer The wav file buffer.
 * @param {!Object} signature The file signature.
 * @private
 */
function readCueChunk_(buffer, signature, wav, uInt32_, uInt16_) {

  /** @type {?Object} */
  let chunk = findChunk_(signature, 'cue ');
  if (chunk) {
    io.head_ = chunk.chunkData.start;
    wav.cue.chunkId = chunk.chunkId;
    wav.cue.chunkSize = chunk.chunkSize;
    wav.cue.dwCuePoints = io.read_(buffer, uInt32_);
    for (let i=0; i<wav.cue.dwCuePoints; i++) {
      wav.cue.points.push({
        dwName: io.read_(buffer, uInt32_),
        dwPosition: io.read_(buffer, uInt32_),
        fccChunk: io.readString_(buffer, 4),
        dwChunkStart: io.read_(buffer, uInt32_),
        dwBlockStart: io.read_(buffer, uInt32_),
        dwSampleOffset: io.read_(buffer, uInt32_),
      });
    }
  }
}

/**
 * Read the 'smpl' chunk of a wave file.
 * @param {!Uint8Array} buffer The wav file buffer.
 * @param {!Object} signature The file signature.
 * @private
 */
function readSmplChunk_(buffer, signature, wav, uInt32_, uInt16_) {

  /** @type {?Object} */
  let chunk = findChunk_(signature, 'smpl');
  if (chunk) {
    io.head_ = chunk.chunkData.start;
    wav.smpl.chunkId = chunk.chunkId;
    wav.smpl.chunkSize = chunk.chunkSize;
    wav.smpl.dwManufacturer = io.read_(buffer, uInt32_);
    wav.smpl.dwProduct = io.read_(buffer, uInt32_);
    wav.smpl.dwSamplePeriod = io.read_(buffer, uInt32_);
    wav.smpl.dwMIDIUnityNote = io.read_(buffer, uInt32_);
    wav.smpl.dwMIDIPitchFraction = io.read_(buffer, uInt32_);
    wav.smpl.dwSMPTEFormat = io.read_(buffer, uInt32_);
    wav.smpl.dwSMPTEOffset = io.read_(buffer, uInt32_);
    wav.smpl.dwNumSampleLoops = io.read_(buffer, uInt32_);
    wav.smpl.dwSamplerData = io.read_(buffer, uInt32_);
    for (let i=0; i<wav.smpl.dwNumSampleLoops; i++) {
      wav.smpl.loops.push({
        dwName: io.read_(buffer, uInt32_),
        dwType: io.read_(buffer, uInt32_),
        dwStart: io.read_(buffer, uInt32_),
        dwEnd: io.read_(buffer, uInt32_),
        dwFraction: io.read_(buffer, uInt32_),
        dwPlayCount: io.read_(buffer, uInt32_),
      });
    }
  }
}

/**
 * Read the 'data' chunk of a wave file.
 * @param {!Uint8Array} buffer The wav file buffer.
 * @param {!Object} signature The file signature.
 * @param {boolean} samples True if the samples should be loaded.
 * @throws {Error} If no 'data' chunk is found.
 * @private
 */
function readDataChunk_(buffer, signature, samples, wav, uInt32_, uInt16_) {

  /** @type {?Object} */
  let chunk = findChunk_(signature, 'data');
  if (chunk) {
    wav.data.chunkId = 'data';
    wav.data.chunkSize = chunk.chunkSize;
    if (samples) {
      wav.data.samples = buffer.slice(
        chunk.chunkData.start,
        chunk.chunkData.end);
    }
  } else {
    throw Error('Could not find the "data" chunk');
  }
}

/**
 * Read the 'bext' chunk of a wav file.
 * @param {!Uint8Array} buffer The wav file buffer.
 * @param {!Object} signature The file signature.
 * @private
 */
function readBextChunk_(buffer, signature, wav, uInt32_, uInt16_) {
  /** @type {?Object} */
  let chunk = findChunk_(signature, 'bext');
  if (chunk) {
    io.head_ = chunk.chunkData.start;
    wav.bext.chunkId = chunk.chunkId;
    wav.bext.chunkSize = chunk.chunkSize;
    wav.bext.description = io.readString_(buffer, 256);
    wav.bext.originator = io.readString_(buffer, 32);
    wav.bext.originatorReference = io.readString_(buffer, 32);
    wav.bext.originationDate = io.readString_(buffer, 10);
    wav.bext.originationTime = io.readString_(buffer, 8);
    wav.bext.timeReference = [
      io.read_(buffer, uInt32_),
      io.read_(buffer, uInt32_)];
    wav.bext.version = io.read_(buffer, uInt16_);
    wav.bext.UMID = io.readString_(buffer, 64);
    wav.bext.loudnessValue = io.read_(buffer, uInt16_);
    wav.bext.loudnessRange = io.read_(buffer, uInt16_);
    wav.bext.maxTruePeakLevel = io.read_(buffer, uInt16_);
    wav.bext.maxMomentaryLoudness = io.read_(buffer, uInt16_);
    wav.bext.maxShortTermLoudness = io.read_(buffer, uInt16_);
    wav.bext.reserved = io.readString_(buffer, 180);
    wav.bext.codingHistory = io.readString_(
      buffer, wav.bext.chunkSize - 602);
  }
}

/**
 * Read the 'ds64' chunk of a wave file.
 * @param {!Uint8Array} buffer The wav file buffer.
 * @param {!Object} signature The file signature.
 * @throws {Error} If no 'ds64' chunk is found and the file is RF64.
 * @private
 */
function readDs64Chunk_(buffer, signature, wav, uInt32_, uInt16_) {

  /** @type {?Object} */
  let chunk = findChunk_(signature, 'ds64');
  if (chunk) {
    io.head_ = chunk.chunkData.start;
    wav.ds64.chunkId = chunk.chunkId;
    wav.ds64.chunkSize = chunk.chunkSize;
    wav.ds64.riffSizeHigh = io.read_(buffer, uInt32_);
    wav.ds64.riffSizeLow = io.read_(buffer, uInt32_);
    wav.ds64.dataSizeHigh = io.read_(buffer, uInt32_);
    wav.ds64.dataSizeLow = io.read_(buffer, uInt32_);
    wav.ds64.originationTime = io.read_(buffer, uInt32_);
    wav.ds64.sampleCountHigh = io.read_(buffer, uInt32_);
    wav.ds64.sampleCountLow = io.read_(buffer, uInt32_);
    //if (wav.ds64.chunkSize > 28) {
    //  wav.ds64.tableLength = unpack(
    //    chunkData.slice(28, 32), uInt32_);
    //  wav.ds64.table = chunkData.slice(
    //     32, 32 + wav.ds64.tableLength);
    //}
  } else {
    if (wav.container == 'RF64') {
      throw Error('Could not find the "ds64" chunk');
    }
  }
}

/**
 * Read the 'LIST' chunks of a wave file.
 * @param {!Uint8Array} buffer The wav file buffer.
 * @param {!Object} signature The file signature.
 * @private
 */
function readLISTChunk_(buffer, signature, wav, uInt32_, uInt16_) {
  /** @type {?Object} */
  let listChunks = findChunk_(signature, 'LIST', true);
  if (listChunks === null) {
    return;
  }
  for (let j=0; j < listChunks.length; j++) {
    /** @type {!Object} */
    let subChunk = listChunks[j];
    wav.LIST.push({
      chunkId: subChunk.chunkId,
      chunkSize: subChunk.chunkSize,
      format: subChunk.format,
      subChunks: []});
    for (let x=0; x<subChunk.subChunks.length; x++) {
      readLISTSubChunks_(subChunk.subChunks[x],
        subChunk.format, buffer, wav, uInt32_, uInt16_);
    }
  }
}

/**
 * Read the sub chunks of a 'LIST' chunk.
 * @param {!Object} subChunk The 'LIST' subchunks.
 * @param {string} format The 'LIST' format, 'adtl' or 'INFO'.
 * @param {!Uint8Array} buffer The wav file buffer.
 * @private
 */
function readLISTSubChunks_(subChunk, format, buffer, wav, uInt32_, uInt16_) {
  if (format == 'adtl') {
    if (['labl', 'note','ltxt'].indexOf(subChunk.chunkId) > -1) {
      io.head_ = subChunk.chunkData.start;
      /** @type {!Object<string, string|number>} */
      let item = {
        chunkId: subChunk.chunkId,
        chunkSize: subChunk.chunkSize,
        dwName: io.read_(buffer, uInt32_)
      };
      if (subChunk.chunkId == 'ltxt') {
        item.dwSampleLength = io.read_(buffer, uInt32_);
        item.dwPurposeID = io.read_(buffer, uInt32_);
        item.dwCountry = io.read_(buffer, uInt16_);
        item.dwLanguage = io.read_(buffer, uInt16_);
        item.dwDialect = io.read_(buffer, uInt16_);
        item.dwCodePage = io.read_(buffer, uInt16_);
      }
      item.value = io.readZSTR_(buffer, io.head_);
      wav.LIST[wav.LIST.length - 1].subChunks.push(item);
    }
  // RIFF INFO tags like ICRD, ISFT, ICMT
  } else if(format == 'INFO') {
    io.head_ = subChunk.chunkData.start;
    wav.LIST[wav.LIST.length - 1].subChunks.push({
      chunkId: subChunk.chunkId,
      chunkSize: subChunk.chunkSize,
      value: io.readZSTR_(buffer, io.head_)
    });
  }
}

/**
 * Read the 'junk' chunk of a wave file.
 * @param {!Uint8Array} buffer The wav file buffer.
 * @param {!Object} signature The file signature.
 * @private
 */
function readJunkChunk_(buffer, signature, wav, uInt32_, uInt16_) {

  /** @type {?Object} */
  let chunk = findChunk_(signature, 'junk');
  if (chunk) {
    wav.junk = {
      chunkId: chunk.chunkId,
      chunkSize: chunk.chunkSize,
      chunkData: [].slice.call(buffer.slice(
        chunk.chunkData.start,
        chunk.chunkData.end))
    };
  }
}


1			/*
2			* Copyright (c) 2018 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 Get structured wav data out of buffers.
27			* @see https://github.com/rochars/wavefile
28			*/
29
30			import {riffChunks, findChunk_} from '../vendor/riff-chunks.js';
31			import BufferIO from './bufferio.js';
32
33			let io = new BufferIO();
34
35			/**
36			* Set up the WaveFile object from a byte buffer.
37			* @param {!Uint8Array} buffer The buffer.
38			* @param {boolean} samples True if the samples should be loaded.
39			* @param {!Object} wav True if the samples should be loaded.
40			* @param {!Object} uInt32_ True if the samples should be loaded.
41			* @param {!Object} uInt16_ True if the samples should be loaded.
42			* @throws {Error} If container is not RIFF, RIFX or RF64.
43			* @throws {Error} If no 'fmt ' chunk is found.
44			* @throws {Error} If no 'data' chunk is found.
45			*/
46			export default function readWavBuffer(buffer, samples, wav, uInt32_, uInt16_) {
47			io.head_ = 0;
48			readRIFFChunk_(buffer, wav, uInt32_, uInt16_);
49			/** @type {!Object} */
50			let chunk = riffChunks(buffer);
51			readDs64Chunk_(buffer, chunk.subChunks, wav, uInt32_, uInt16_);
52			readFmtChunk_(buffer, chunk.subChunks, wav, uInt32_, uInt16_);
53			readFactChunk_(buffer, chunk.subChunks, wav, uInt32_, uInt16_);
54			readBextChunk_(buffer, chunk.subChunks, wav, uInt32_, uInt16_);
55			readCueChunk_(buffer, chunk.subChunks, wav, uInt32_, uInt16_);
56			readSmplChunk_(buffer, chunk.subChunks, wav, uInt32_, uInt16_);
57			readDataChunk_(buffer, chunk.subChunks, samples, wav, uInt32_, uInt16_);
58			readJunkChunk_(buffer, chunk.subChunks, wav, uInt32_, uInt16_);
59			readLISTChunk_(buffer, chunk.subChunks, wav, uInt32_, uInt16_);
60			bitDepthFromFmt_(wav, uInt32_, uInt16_);
61			}
62
63			/**
64			* Set the string code of the bit depth based on the 'fmt ' chunk.
65			* @private
66			*/
67			function bitDepthFromFmt_(wav, uInt32_, uInt16_) {
			0 ignored issues – show Unused Code introduced 2018-07-10 23:54 UTC by Report Bug Copy Issue Report The parameter `uInt16_` is not used and could be removed. This check looks for parameters in functions that are not used in the function body and are not followed by other parameters which are used inside the function. Loading history... Unused Code introduced 2018-07-10 23:54 UTC by Report Bug Copy Issue Report The parameter `uInt32_` is not used and could be removed. This check looks for parameters in functions that are not used in the function body and are not followed by other parameters which are used inside the function. Loading history...
68			if (wav.fmt.audioFormat === 3 && wav.fmt.bitsPerSample === 32) {
69			wav.bitDepth = '32f';
70			} else if (wav.fmt.audioFormat === 6) {
71			wav.bitDepth = '8a';
72			} else if (wav.fmt.audioFormat === 7) {
73			wav.bitDepth = '8m';
74			} else {
75			wav.bitDepth = wav.fmt.bitsPerSample.toString();
76			}
77			}
78
79			/**
80			* Read the RIFF chunk a wave file.
81			* @param {!Uint8Array} bytes A wav buffer.
82			* @throws {Error} If no 'RIFF' chunk is found.
83			* @private
84			*/
85			function readRIFFChunk_(bytes, wav, uInt32_, uInt16_) {
86			io.head_ = 0;
87			wav.container = io.readString_(bytes, 4);
88			if (['RIFF', 'RIFX', 'RF64'].indexOf(wav.container) === -1) {
89			throw Error('Not a supported format.');
90			}
91			uInt16_.be = wav.container === 'RIFX';
92			uInt32_.be = uInt16_.be;
93			wav.chunkSize = io.read_(bytes, uInt32_);
94			wav.format = io.readString_(bytes, 4);
95			if (wav.format != 'WAVE') {
96			throw Error('Could not find the "WAVE" format identifier');
97			}
98			}
99
100			/**
101			* Read the 'fmt ' chunk of a wave file.
102			* @param {!Uint8Array} buffer The wav file buffer.
103			* @param {!Object} signature The file signature.
104			* @throws {Error} If no 'fmt ' chunk is found.
105			* @private
106			*/
107			function readFmtChunk_(buffer, signature, wav, uInt32_, uInt16_) {
108			/** @type {?Object} */
109			let chunk = findChunk_(signature, 'fmt ');
110			if (chunk) {
111			io.head_ = chunk.chunkData.start;
112			wav.fmt.chunkId = chunk.chunkId;
113			wav.fmt.chunkSize = chunk.chunkSize;
114			wav.fmt.audioFormat = io.read_(buffer, uInt16_);
115			wav.fmt.numChannels = io.read_(buffer, uInt16_);
116			wav.fmt.sampleRate = io.read_(buffer, uInt32_);
117			wav.fmt.byteRate = io.read_(buffer, uInt32_);
118			wav.fmt.blockAlign = io.read_(buffer, uInt16_);
119			wav.fmt.bitsPerSample = io.read_(buffer, uInt16_);
120			readFmtExtension_(buffer, wav, uInt32_, uInt16_);
121			} else {
122			throw Error('Could not find the "fmt " chunk');
123			}
124			}
125
126			/**
127			* Read the 'fmt ' chunk extension.
128			* @param {!Uint8Array} buffer The wav file buffer.
129			* @private
130			*/
131			function readFmtExtension_(buffer, wav, uInt32_, uInt16_) {
132			if (wav.fmt.chunkSize > 16) {
133			wav.fmt.cbSize = io.read_(buffer, uInt16_);
134			if (wav.fmt.chunkSize > 18) {
135			wav.fmt.validBitsPerSample = io.read_(buffer, uInt16_);
136			if (wav.fmt.chunkSize > 20) {
137			wav.fmt.dwChannelMask = io.read_(buffer, uInt32_);
138			wav.fmt.subformat = [
139			io.read_(buffer, uInt32_),
140			io.read_(buffer, uInt32_),
141			io.read_(buffer, uInt32_),
142			io.read_(buffer, uInt32_)];
143			}
144			}
145			}
146			}
147
148			/**
149			* Read the 'fact' chunk of a wav file.
150			* @param {!Uint8Array} buffer The wav file buffer.
151			* @param {!Object} signature The file signature.
152			* @private
153			*/
154			function readFactChunk_(buffer, signature, wav, uInt32_, uInt16_) {
			0 ignored issues – show Unused Code introduced 2018-07-10 23:54 UTC by Report Bug Copy Issue Report The parameter `uInt16_` is not used and could be removed. This check looks for parameters in functions that are not used in the function body and are not followed by other parameters which are used inside the function. Loading history...
155			/** @type {?Object} */
156			let chunk = findChunk_(signature, 'fact');
157			if (chunk) {
158			io.head_ = chunk.chunkData.start;
159			wav.fact.chunkId = chunk.chunkId;
160			wav.fact.chunkSize = chunk.chunkSize;
161			wav.fact.dwSampleLength = io.read_(buffer, uInt32_);
162			}
163			}
164
165			/**
166			* Read the 'cue ' chunk of a wave file.
167			* @param {!Uint8Array} buffer The wav file buffer.
168			* @param {!Object} signature The file signature.
169			* @private
170			*/
171			function readCueChunk_(buffer, signature, wav, uInt32_, uInt16_) {
			0 ignored issues – show Unused Code introduced 2018-07-10 23:54 UTC by Report Bug Copy Issue Report The parameter `uInt16_` is not used and could be removed. This check looks for parameters in functions that are not used in the function body and are not followed by other parameters which are used inside the function. Loading history...
172			/** @type {?Object} */
173			let chunk = findChunk_(signature, 'cue ');
174			if (chunk) {
175			io.head_ = chunk.chunkData.start;
176			wav.cue.chunkId = chunk.chunkId;
177			wav.cue.chunkSize = chunk.chunkSize;
178			wav.cue.dwCuePoints = io.read_(buffer, uInt32_);
179			for (let i=0; i<wav.cue.dwCuePoints; i++) {
180			wav.cue.points.push({
181			dwName: io.read_(buffer, uInt32_),
182			dwPosition: io.read_(buffer, uInt32_),
183			fccChunk: io.readString_(buffer, 4),
184			dwChunkStart: io.read_(buffer, uInt32_),
185			dwBlockStart: io.read_(buffer, uInt32_),
186			dwSampleOffset: io.read_(buffer, uInt32_),
187			});
188			}
189			}
190			}
191
192			/**
193			* Read the 'smpl' chunk of a wave file.
194			* @param {!Uint8Array} buffer The wav file buffer.
195			* @param {!Object} signature The file signature.
196			* @private
197			*/
198			function readSmplChunk_(buffer, signature, wav, uInt32_, uInt16_) {
			0 ignored issues – show Unused Code introduced 2018-07-10 23:54 UTC by Report Bug Copy Issue Report The parameter `uInt16_` is not used and could be removed. This check looks for parameters in functions that are not used in the function body and are not followed by other parameters which are used inside the function. Loading history...
199			/** @type {?Object} */
200			let chunk = findChunk_(signature, 'smpl');
201			if (chunk) {
202			io.head_ = chunk.chunkData.start;
203			wav.smpl.chunkId = chunk.chunkId;
204			wav.smpl.chunkSize = chunk.chunkSize;
205			wav.smpl.dwManufacturer = io.read_(buffer, uInt32_);
206			wav.smpl.dwProduct = io.read_(buffer, uInt32_);
207			wav.smpl.dwSamplePeriod = io.read_(buffer, uInt32_);
208			wav.smpl.dwMIDIUnityNote = io.read_(buffer, uInt32_);
209			wav.smpl.dwMIDIPitchFraction = io.read_(buffer, uInt32_);
210			wav.smpl.dwSMPTEFormat = io.read_(buffer, uInt32_);
211			wav.smpl.dwSMPTEOffset = io.read_(buffer, uInt32_);
212			wav.smpl.dwNumSampleLoops = io.read_(buffer, uInt32_);
213			wav.smpl.dwSamplerData = io.read_(buffer, uInt32_);
214			for (let i=0; i<wav.smpl.dwNumSampleLoops; i++) {
215			wav.smpl.loops.push({
216			dwName: io.read_(buffer, uInt32_),
217			dwType: io.read_(buffer, uInt32_),
218			dwStart: io.read_(buffer, uInt32_),
219			dwEnd: io.read_(buffer, uInt32_),
220			dwFraction: io.read_(buffer, uInt32_),
221			dwPlayCount: io.read_(buffer, uInt32_),
222			});
223			}
224			}
225			}
226
227			/**
228			* Read the 'data' chunk of a wave file.
229			* @param {!Uint8Array} buffer The wav file buffer.
230			* @param {!Object} signature The file signature.
231			* @param {boolean} samples True if the samples should be loaded.
232			* @throws {Error} If no 'data' chunk is found.
233			* @private
234			*/
235			function readDataChunk_(buffer, signature, samples, wav, uInt32_, uInt16_) {
			0 ignored issues – show Unused Code introduced 2018-07-10 23:54 UTC by Report Bug Copy Issue Report The parameter `uInt32_` is not used and could be removed. This check looks for parameters in functions that are not used in the function body and are not followed by other parameters which are used inside the function. Loading history... Unused Code introduced 2018-07-10 23:54 UTC by Report Bug Copy Issue Report The parameter `uInt16_` is not used and could be removed. This check looks for parameters in functions that are not used in the function body and are not followed by other parameters which are used inside the function. Loading history...
236			/** @type {?Object} */
237			let chunk = findChunk_(signature, 'data');
238			if (chunk) {
239			wav.data.chunkId = 'data';
240			wav.data.chunkSize = chunk.chunkSize;
241			if (samples) {
242			wav.data.samples = buffer.slice(
243			chunk.chunkData.start,
244			chunk.chunkData.end);
245			}
246			} else {
247			throw Error('Could not find the "data" chunk');
248			}
249			}
250
251			/**
252			* Read the 'bext' chunk of a wav file.
253			* @param {!Uint8Array} buffer The wav file buffer.
254			* @param {!Object} signature The file signature.
255			* @private
256			*/
257			function readBextChunk_(buffer, signature, wav, uInt32_, uInt16_) {
258			/** @type {?Object} */
259			let chunk = findChunk_(signature, 'bext');
260			if (chunk) {
261			io.head_ = chunk.chunkData.start;
262			wav.bext.chunkId = chunk.chunkId;
263			wav.bext.chunkSize = chunk.chunkSize;
264			wav.bext.description = io.readString_(buffer, 256);
265			wav.bext.originator = io.readString_(buffer, 32);
266			wav.bext.originatorReference = io.readString_(buffer, 32);
267			wav.bext.originationDate = io.readString_(buffer, 10);
268			wav.bext.originationTime = io.readString_(buffer, 8);
269			wav.bext.timeReference = [
270			io.read_(buffer, uInt32_),
271			io.read_(buffer, uInt32_)];
272			wav.bext.version = io.read_(buffer, uInt16_);
273			wav.bext.UMID = io.readString_(buffer, 64);
274			wav.bext.loudnessValue = io.read_(buffer, uInt16_);
275			wav.bext.loudnessRange = io.read_(buffer, uInt16_);
276			wav.bext.maxTruePeakLevel = io.read_(buffer, uInt16_);
277			wav.bext.maxMomentaryLoudness = io.read_(buffer, uInt16_);
278			wav.bext.maxShortTermLoudness = io.read_(buffer, uInt16_);
279			wav.bext.reserved = io.readString_(buffer, 180);
280			wav.bext.codingHistory = io.readString_(
281			buffer, wav.bext.chunkSize - 602);
282			}
283			}
284
285			/**
286			* Read the 'ds64' chunk of a wave file.
287			* @param {!Uint8Array} buffer The wav file buffer.
288			* @param {!Object} signature The file signature.
289			* @throws {Error} If no 'ds64' chunk is found and the file is RF64.
290			* @private
291			*/
292			function readDs64Chunk_(buffer, signature, wav, uInt32_, uInt16_) {
			0 ignored issues – show Unused Code introduced 2018-07-10 23:54 UTC by Report Bug Copy Issue Report The parameter `uInt16_` is not used and could be removed. This check looks for parameters in functions that are not used in the function body and are not followed by other parameters which are used inside the function. Loading history...
293			/** @type {?Object} */
294			let chunk = findChunk_(signature, 'ds64');
295			if (chunk) {
296			io.head_ = chunk.chunkData.start;
297			wav.ds64.chunkId = chunk.chunkId;
298			wav.ds64.chunkSize = chunk.chunkSize;
299			wav.ds64.riffSizeHigh = io.read_(buffer, uInt32_);
300			wav.ds64.riffSizeLow = io.read_(buffer, uInt32_);
301			wav.ds64.dataSizeHigh = io.read_(buffer, uInt32_);
302			wav.ds64.dataSizeLow = io.read_(buffer, uInt32_);
303			wav.ds64.originationTime = io.read_(buffer, uInt32_);
304			wav.ds64.sampleCountHigh = io.read_(buffer, uInt32_);
305			wav.ds64.sampleCountLow = io.read_(buffer, uInt32_);
306			//if (wav.ds64.chunkSize > 28) {
307			// wav.ds64.tableLength = unpack(
308			// chunkData.slice(28, 32), uInt32_);
309			// wav.ds64.table = chunkData.slice(
310			// 32, 32 + wav.ds64.tableLength);
311			//}
312			} else {
313			if (wav.container == 'RF64') {
314			throw Error('Could not find the "ds64" chunk');
315			}
316			}
317			}
318
319			/**
320			* Read the 'LIST' chunks of a wave file.
321			* @param {!Uint8Array} buffer The wav file buffer.
322			* @param {!Object} signature The file signature.
323			* @private
324			*/
325			function readLISTChunk_(buffer, signature, wav, uInt32_, uInt16_) {
326			/** @type {?Object} */
327			let listChunks = findChunk_(signature, 'LIST', true);
328			if (listChunks === null) {
329			return;
330			}
331			for (let j=0; j < listChunks.length; j++) {
332			/** @type {!Object} */
333			let subChunk = listChunks[j];
334			wav.LIST.push({
335			chunkId: subChunk.chunkId,
336			chunkSize: subChunk.chunkSize,
337			format: subChunk.format,
338			subChunks: []});
339			for (let x=0; x<subChunk.subChunks.length; x++) {
340			readLISTSubChunks_(subChunk.subChunks[x],
341			subChunk.format, buffer, wav, uInt32_, uInt16_);
342			}
343			}
344			}
345
346			/**
347			* Read the sub chunks of a 'LIST' chunk.
348			* @param {!Object} subChunk The 'LIST' subchunks.
349			* @param {string} format The 'LIST' format, 'adtl' or 'INFO'.
350			* @param {!Uint8Array} buffer The wav file buffer.
351			* @private
352			*/
353			function readLISTSubChunks_(subChunk, format, buffer, wav, uInt32_, uInt16_) {
354			if (format == 'adtl') {
355			if (['labl', 'note','ltxt'].indexOf(subChunk.chunkId) > -1) {
356			io.head_ = subChunk.chunkData.start;
357			/** @type {!Object<string, string\|number>} */
358			let item = {
359			chunkId: subChunk.chunkId,
360			chunkSize: subChunk.chunkSize,
361			dwName: io.read_(buffer, uInt32_)
362			};
363			if (subChunk.chunkId == 'ltxt') {
364			item.dwSampleLength = io.read_(buffer, uInt32_);
365			item.dwPurposeID = io.read_(buffer, uInt32_);
366			item.dwCountry = io.read_(buffer, uInt16_);
367			item.dwLanguage = io.read_(buffer, uInt16_);
368			item.dwDialect = io.read_(buffer, uInt16_);
369			item.dwCodePage = io.read_(buffer, uInt16_);
370			}
371			item.value = io.readZSTR_(buffer, io.head_);
372			wav.LIST[wav.LIST.length - 1].subChunks.push(item);
373			}
374			// RIFF INFO tags like ICRD, ISFT, ICMT
375			} else if(format == 'INFO') {
376			io.head_ = subChunk.chunkData.start;
377			wav.LIST[wav.LIST.length - 1].subChunks.push({
378			chunkId: subChunk.chunkId,
379			chunkSize: subChunk.chunkSize,
380			value: io.readZSTR_(buffer, io.head_)
381			});
382			}
383			}
384
385			/**
386			* Read the 'junk' chunk of a wave file.
387			* @param {!Uint8Array} buffer The wav file buffer.
388			* @param {!Object} signature The file signature.
389			* @private
390			*/
391			function readJunkChunk_(buffer, signature, wav, uInt32_, uInt16_) {
			0 ignored issues – show Unused Code introduced 2018-07-10 23:54 UTC by Report Bug Copy Issue Report The parameter `uInt16_` is not used and could be removed. This check looks for parameters in functions that are not used in the function body and are not followed by other parameters which are used inside the function. Loading history... Unused Code introduced 2018-07-10 23:54 UTC by Report Bug Copy Issue Report The parameter `uInt32_` is not used and could be removed. This check looks for parameters in functions that are not used in the function body and are not followed by other parameters which are used inside the function. Loading history...
392			/** @type {?Object} */
393			let chunk = findChunk_(signature, 'junk');
394			if (chunk) {
395			wav.junk = {
396			chunkId: chunk.chunkId,
397			chunkSize: chunk.chunkSize,
398			chunkData: [].slice.call(buffer.slice(
399			chunk.chunkData.start,
400			chunk.chunkData.end))
401			};
402			}
403			}
404

rochars / wavefile

Branch — v8.x (d6a5cf)

lib/wav-buffer-reader.js A

Complexity

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Duplication

Importance

14 Functions

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