wavefile

wavefile

Read & write wave files with 4, 8, 16, 24, 32 & 64-bit data.
Copyright (c) 2017 Rafael da Silva Rocha.
https://github.com/rochars/wavefile

Install

npm install wavefile

See it in action

https://tr2099.github.io/

Hit "Load in player" to generate wave files.

Use

let fs = require("fs");
let Wavefile = require("wavefile");

let wav = new Wavefile(fs.readFileSync("file.wav"));
console.log(wav.chunkId);
console.log(wav.chunkSize);
console.log(wav.fmtChunkId);
fs.writeFileSync(path, wav.toBuffer());

Create wave files from scratch

let wav = new WaveFile();

// mono
wav.fromScratch(1, 44100, '32', [0, -2147483648, 2147483647, 4]);
fs.writeFileSync(path, wav.toBuffer());

// stereo
wav.fromScratch(2, 48000, '8', [
    [0, -2, 4, 3],
    [0, -1, 4, 3]
]);
wav.interleave();
fs.writeFileSync(path, wav.toBuffer());

// Default is RIFF. To create RIFX files:
wav.fromScratch(1, 44100, '32', samples, {"container": "RIFX"});
fs.writeFileSync(path, wav.toBuffer());

Change the bit depth

Currently there is no dithering when changing the bit depth.

If the samples are stereo they need to be interleaved before changing the bit depth.

let wav = new Wavefile(fs.readFileSync("file.wav"));

// Possible values are:
//  "8", "16", "24", "32", "32f", "64"
wav.toBitDepth("24");

Interleave and de-interleave stereo samples

// Interleave stereo samples
wav.interleave();

// De-interleave the samples into multiple channels
wav.deInterleave();

RIFF to RIFX and RIFX to RIFF

// Turn a RIFF file to a RIFX file
wav.toRIFX();

// Turn a RIFX file to a RIFF file
wav.toRIFF();

IMA-ADPCM

16-bit 8000 Hz wave files can be compressed as IMA-ADPCM:

// Encode a 16-bit wave file as 4-bit IMA-ADPCM:
wav.toIMAADPCM();

To decode 4-bit IMA-ADPCM as 16-bit PCM:

// Decode 4-bit IMA-ADPCM as 16-bit:
wav.fromIMAADPCM();

The decoder assumes a 256 block align. To use a different block align:

// Decode 4-bit IMA-ADPCM, 1024 blockalign:
wav.fromIMAADPCM(1024);

A-Law

16-bit wave files can be encoded as A-Law:

// Encode a 16-bit wave file as 8-bit A-law:
wav.toALaw();

To decode 8-bit A-Law as 16-bit PCM:

// Decode 8-bit A-Law as 16-bit:
wav.fromALaw();

mu-Law

16-bit wave files can be encoded as mu-Law:

// Encode a 16-bit wave file as 8-bit A-law:
wav.toMuLaw();

To decode 8-bit mu-Law as 16-bit PCM:

// Decode 8-bit A-Law as 16-bit:
wav.fromMuLaw();

The properties

let wav = new Wavefile(fs.readFileSync("file.wav"));

// The container, "RIFF" or "RIFX"
console.log(wav.chunkId);
console.log(wav.chunkSize);
console.log(wav.format); // WAVE

// "fmt "
console.log(wav.fmtChunkId);
console.log(wav.fmtChunkSize);
console.log(wav.audioFormat);
console.log(wav.numChannels);
console.log(wav.sampleRate);
console.log(wav.byteRate);
console.log(wav.blockAlign);
console.log(wav.bitsPerSample);
console.log(wav.cbSize);
console.log(wav.validBitsPerSample);

// "fact"
console.log(wav.factChunkId);
console.log(wav.factChunkSize);
console.log(wav.dwSampleLength);

// "data"
console.log(wav.dataChunkId);
console.log(wav.dataChunkSize);

// array of numbers
console.log(wav.samples);

The samples

Range:

• 0 to 255 for 8-bit
• -32768 to 32767 for 16-bit
• -8388608 to 8388607 for 24-bit
• -2147483648 to 2147483647 for 32-bit
• -1.0 to 1.0 for 32-bit (float)
• -1.0 to 1.0 for 64-bit (float)

LICENSE

Copyright (c) 2017 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.