Riff Wave Reader


This library reads the data within RIFF file with it's contents formatted as a WAVE file containing PCM data.

Live Demo on GitHub 

Installation

This npm package is available as riff-wave-reader

From your terminal, install with the following command.

npm install riff-wave-reader --save

How to use

Node

``javascript
import Reader from "riff-wave-reader/reader";
let reader;
const channel = 0;
const index = 0;

// from array
const data =
"52 49 46 46 d5 10 00 00 57 41 56 45 66 6d 74 20 " +
"10 00 00 00 01 00 01 00 40 1f 00 00 40 1f 00 00 " +
"01 00 08 00 64 61 74 61 b1 10 00 00 7f";
const array = data.split(" ").map(v => parseInt(v, 16));
reader = new RiffWaveReader(array);

// To handle large files without loading them completely into memory
// from wrapped file, buffer, array, and array buffers
reader = new RiffWaveReader(new Reader("./samples/hello.wav"));
reader = new RiffWaveReader(new Reader(Buffer.from(array)));
reader = new RiffWaveReader(new Reader(array));
reader = new RiffWaveReader(new ArrayBuffer(array));

// Read header chunks
reader.readChunks().then(chunks => {
console.log(chunks);
});
reader.readSample(channel, index).then(sample => console.log(sample));
// 127
`

The chunks would be written out as:

`json
{
"riff": {
"tag": "RIFF",
"size": 4309,
"format": "WAVE"
},
"format": {
"id": "fmt ",
"size": 16,
"type": 1,
"channels": 1,
"sampleRate": 8000,
"byteRate": 8000,
"blockAlignment": 1,
"bitsPerSample": 8,
"typeName": "PCM",
"sampleSize": 1
},
"data": {
"id": "data",
"size": 4273,
"start": 44,
"sampleCount": 4265,
"duration": 0.533125
}
}
`

Web Browser

`html



`

Modifications

Building

Building is done via webpack as a universal module definition (UMD) library.

From terminal

`bash
npm run build
`

1. Creates a script in development mode under /docs/dist/riff-wave-reader.js
1. Creates a script in production mode under /lib/dist/riff-wave-reader.js along with a sourcemap file

Local Testing

From terminal

`bash
npm run start
``

Your web browser will open http://localhost:3000/docs/index.html