README

wavefile-creator

Create, read and write wav files.

Install

npm install wavefile-creator

Use

Node

const wavefileCreator = require('wavefile-creator');
let wav = new wavefileCreator.WaveFileCreator();

const WaveFileCreator = require('wavefile-creator').WaveFileCreator;
let wav = new WaveFileCreator();

import { WaveFileCreator } from 'wavefile-creator';
let wav = new WaveFileCreator();

Node.js Example

const WaveFileCreator = require('wavefile-creator').WaveFileCreator;

// Load a wav file buffer as a WaveFileCreator object
let wav = new WaveFileCreator();
wav.fromBuffer(buffer);

// Check some of the file properties
console.log(wav.container);
console.log(wav.chunkSize);
console.log(wav.fmt.chunkId);

// toBuffer() return a wav file buffer
// ready to be written to disk...
let theFile = wav.toBuffer();

// ...or to be loaded by another WaveFileCreator object
let wav2 = new WaveFileCreator(theFile);

Browser

Use the wavefile-creator.js file in the dist folder:

<script src="wavefile-creator.js"></script>
<script>
  var wav = new wavefileCreator.WaveFileCreator();
</script>

Or load it from the jsDelivr CDN:

<script src="https://cdn.jsdelivr.net/npm/wavefile-creator"></script>

Or load it from unpkg:

<script src="https://unpkg.com/wavefile-creator"></script>

Create wave files from scratch

Use the fromScratch(numChannels, sampleRate, bitDepth, samples) method.

Mono:

let wav = new WaveFile();

// Create a mono wave file, 44.1 kHz, 32-bit and 4 samples
wav.fromScratch(1, 44100, '32', [0, -2147483, 2147483, 4]);
fs.writeFileSync(path, wav.toBuffer());

Stereo:

Samples can be informed interleaved or de-interleaved. If they are de-interleaved, WaveFile will interleave them. In this example they are de-interleaved.

// Stereo, 48 kHz, 8-bit, de-interleaved samples
// WaveFile interleave the samples automatically
wav.fromScratch(2, 48000, '8', [
    [0, 2, 4, 3],
    [0, 1, 4, 3]
]);
fs.writeFileSync(path, wav.toBuffer());

Possible values for the bit depth are:
"4" - 4-bit IMA-ADPCM
"8" - 8-bit
"8a" - 8-bit A-Law
"8m" - 8-bit mu-Law
"16" - 16-bit
"24" - 24-bit
"32" - 32-bit
"32f" - 32-bit floating point
"64" - 64-bit floating point

API

The WaveFileCreator methods

/**
 * Set up the WaveFileCreator object from a byte buffer.
 * @param {!Uint8Array} bytes The buffer.
 * @param {boolean=} loadSamples 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.
 */
WaveFileCreator.fromBuffer(bytes, loadSamples=true) {}

/**
 * Return a byte buffer representig the WaveFileCreator object as a .wav file.
 * The return value of this method can be written straight to disk.
 * @return {!Uint8Array} A wav file.
 */
WaveFileCreator.toBuffer() {}

/**
 * Set up the WaveFileCreator object based on the arguments passed.
 * Existing chunks are reset.
 * @param {number} numChannels The number of channels
 *    (Integer numbers: 1 for mono, 2 stereo and so on).
 * @param {number} sampleRate The sample rate.
 *    Integer numbers like 8000, 44100, 48000, 96000, 192000.
 * @param {string} bitDepthCode The audio bit depth code.
 *    One of '4', '8', '8a', '8m', '16', '24', '32', '32f', '64'
 *    or any value between '8' and '32' (like '12').
 * @param {!Array<number>|!Array<!Array<number>>|!TypedArray} samples
 *    The samples. Must be in the correct range according to the bit depth.
 * @param {?Object} options Optional. Used to force the container
 *    as RIFX with {'container': 'RIFX'}
 * @throws {Error} If any argument does not meet the criteria.
 */
fromScratch(numChannels, sampleRate, bitDepthCode, samples, options={}) {}

The WaveFileCreator properties

/**
 * The container identifier.
 * "RIFF", "RIFX" and "RF64" are supported.
 * @type {string}
 */
WaveFileCreator.container = '';
/**
 * @type {number}
 */
WaveFileCreator.chunkSize = 0;
/**
 * The format.
 * Always 'WAVE'.
 * @type {string}
 */
WaveFileCreator.format = '';
/**
 * The data of the "fmt" chunk.
 * @type {!Object<string, *>}
 */
WaveFileCreator.fmt = {
    /** @type {string} */
    chunkId: '',
    /** @type {number} */
    chunkSize: 0,
    /** @type {number} */
    audioFormat: 0,
    /** @type {number} */
    numChannels: 0,
    /** @type {number} */
    sampleRate: 0,
    /** @type {number} */
    byteRate: 0,
    /** @type {number} */
    blockAlign: 0,
    /** @type {number} */
    bitsPerSample: 0,
    /** @type {number} */
    cbSize: 0,
    /** @type {number} */
    validBitsPerSample: 0,
    /** @type {number} */
    dwChannelMask: 0,
    /**
     * 4 32-bit values representing a 128-bit ID
     * @type {!Array<number>}
     */
    subformat: []
};
/**
 * The data of the "fact" chunk.
 * @type {!Object<string, *>}
 */
WaveFileCreator.fact = {
    /** @type {string} */
    chunkId: '',
    /** @type {number} */
    chunkSize: 0,
    /** @type {number} */
    dwSampleLength: 0
};
/**
 * The data of the "cue " chunk.
 * @type {!Object<string, *>}
 */
WaveFileCreator.cue = {
    /** @type {string} */
    chunkId: '',
    /** @type {number} */
    chunkSize: 0,
    /** @type {number} */
    dwCuePoints: 0,
    /** @type {!Array<!Object>} */
    points: [],
};
/**
 * The data of the "smpl" chunk.
 * @type {!Object<string, *>}
 */
WaveFileCreator.smpl = {
    /** @type {string} */
    chunkId: '',
    /** @type {number} */
    chunkSize: 0,
    /** @type {number} */
    dwManufacturer: 0,
    /** @type {number} */
    dwProduct: 0,
    /** @type {number} */
    dwSamplePeriod: 0,
    /** @type {number} */
    dwMIDIUnityNote: 0,
    /** @type {number} */
    dwMIDIPitchFraction: 0,
    /** @type {number} */
    dwSMPTEFormat: 0,
    /** @type {number} */
    dwSMPTEOffset: 0,
    /** @type {number} */
    dwNumSampleLoops: 0,
    /** @type {number} */
    dwSamplerData: 0,
    /** @type {!Array<!Object>} */
    loops: [],
};
/**
 * The data of the "bext" chunk.
 * @type {!Object<string, *>}
 */
WaveFileCreator.bext = {
    /** @type {string} */
    chunkId: '',
    /** @type {number} */
    chunkSize: 0,
    /** @type {string} */
    description: '', //256
    /** @type {string} */
    originator: '', //32
    /** @type {string} */
    originatorReference: '', //32
    /** @type {string} */
    originationDate: '', //10
    /** @type {string} */
    originationTime: '', //8
    /**
     * 2 32-bit values, timeReference high and low
     * @type {!Array<number>}
     */
    timeReference: [0, 0],
    /** @type {number} */
    version: 0, //WORD
    /** @type {string} */
    UMID: '', // 64 chars
    /** @type {number} */
    loudnessValue: 0, //WORD
    /** @type {number} */
    loudnessRange: 0, //WORD
    /** @type {number} */
    maxTruePeakLevel: 0, //WORD
    /** @type {number} */
    maxMomentaryLoudness: 0, //WORD
    /** @type {number} */
    maxShortTermLoudness: 0, //WORD
    /** @type {string} */
    reserved: '', //180
    /** @type {string} */
    codingHistory: '' // string, unlimited
};
/**
 * The data of the "ds64" chunk.
 * Used only with RF64 files.
 * @type {!Object<string, *>}
 */
WaveFileCreator.ds64 = {
    /** @type {string} */
    chunkId: '',
    /** @type {number} */
    chunkSize: 0,
    /** @type {number} */
    riffSizeHigh: 0, // DWORD
    /** @type {number} */
    riffSizeLow: 0, // DWORD
    /** @type {number} */
    dataSizeHigh: 0, // DWORD
    /** @type {number} */
    dataSizeLow: 0, // DWORD
    /** @type {number} */
    originationTime: 0, // DWORD
    /** @type {number} */
    sampleCountHigh: 0, // DWORD
    /** @type {number} */
    sampleCountLow: 0, // DWORD
    /** @type {number} */
    //"tableLength": 0, // DWORD
    /** @type {!Array<number>} */
    //"table": []
};
/**
 * The data of the "data" chunk.
 * @type {!Object<string, *>}
 */
WaveFileCreator.data = {
    /** @type {string} */
    chunkId: '',
    /** @type {number} */
    chunkSize: 0,
    /** @type {!Uint8Array} */
    samples: new Uint8Array(0)
};
/**
 * The data of the "LIST" chunks.
 * Each item in this list look like this:
 *  {
 *      chunkId: '',
 *      chunkSize: 0,
 *      format: '',
 *      subChunks: []
 *   }
 * @type {!Array<!Object>}
 */
WaveFileCreator.LIST = [];
/**
 * The data of the "junk" chunk.
 * @type {!Object<string, *>}
 */
WaveFileCreator.junk = {
    /** @type {string} */
    chunkId: '',
    /** @type {number} */
    chunkSize: 0,
    /** @type {!Array<number>} */
    chunkData: []
};
/**
 * The bit depth code according to the samples.
 * @type {string}
 */
WaveFileCreator.bitDepth =  '';

Cue points

Items in cue.points are objects like this:

{
    /** @type {number} */
    dwName: 0, // a cue point ID
    /** @type {number} */
    dwPosition: 0,
    /** @type {number} */
    fccChunk: 0,
    /** @type {number} */
    dwChunkStart: 0,
    /** @type {number} */
    dwBlockStart: 0,
    /** @type {number} */
    dwSampleOffset: 0
}

Sample loops

Items in smpl.loops are objects like this:

{
    /** @type {string} */
    dwName: '', // a cue point ID
    /** @type {number} */
    dwType: 0,
    /** @type {number} */
    dwStart: 0,
    /** @type {number} */
    dwEnd: 0,
    /** @type {number} */
    dwFraction: 0,
    /** @type {number} */
    dwPlayCount: 0
}

LIST chunk

"LIST" chunk data is stored as follows:

/**
 * An array of the "LIST" chunks present in the file.
 * @type {!Array<!Object>}
 */
WaveFileCreator.LIST = [];

Items in WaveFileCreator.LIST are objects like this:

{
    /** @type {string} */
    chunkId: '', // always 'LIST'
    /** @type {number} */
    chunkSize: 0,
    /** @type {string} */
    format: '', // 'adtl' or 'INFO'
    /** @type {!Array<!Object>} */
    subChunks: []
};

Where "subChunks" are the subChunks of the "LIST" chunk. A single file may have many "LIST" chunks as long as their formats ("INFO", "adtl", etc) are not the same. wavefile-creator can read "LIST" chunks of format "INFO" and "adtl".

For "LIST" chunks with the "INFO" format, "subChunks" will be an array of objects like this:

{
    /** @type {string} */
    chunkId: '', // some RIFF tag
    /** @type {number} */
    chunkSize 0,
    /** @type {string} */
    value: ''
}

Where "chunkId" may be any RIFF tag:
https://sno.phy.queensu.ca/~phil/exiftool/TagNames/RIFF.html#Info

Contributing to wavefile-creator

wavefile-creator welcomes all contributions from anyone willing to work in good faith with other contributors and the community. No contribution is too small and all contributions are valued.

See CONTRIBUTING.md for details.

Style guide

wavefile-creator code should follow the Google JavaScript Style Guide:
https://google.github.io/styleguide/jsguide.html

Code of conduct

This project is bound by a Code of Conduct: The Contributor Covenant, version 1.4, also available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html

References

LICENSE

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.

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