# wav-encoder
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> promise-based wav encoder

## Installation

```
$ npm install wav-encoder
```

## API

- `encode(audioData: AudioData, [opts: object]): Promise<ArrayBuffer>`
  - `audioData` should contain two fields `sampleRate` and `channelData`.
  - `opts` is an optional parameter which used to design the output wav format.
    - `opts.bitDepth` the number of bits of information in each sample
    - `opts.float` encode to float values
    - `opts.symmetric` encode to symmetrical values (see [#10](https://github.com/mohayonao/wav-encoder/issues/10))
    - The default format is `{ float: false, bitDepth: 16 }`
- `encode.sync(audioData: AudioData, [opts: object]): ArrayBuffer`
  - synchronous version

```js
interface AudioData {
  sampleRate: number;
  channelData: Float32Array[];
}
```

## Usage

```js
const fs = require("fs");
const WavEncoder = require("wav-encoder");

const whiteNoise1sec = {
  sampleRate: 44100,
  channelData: [
    new Float32Array(44100).map(() => Math.random() - 0.5),
    new Float32Array(44100).map(() => Math.random() - 0.5)
  ]
};

WavEncoder.encode(whiteNoise1sec).then((buffer) => {
  fs.writeFileSync("noise.wav", new Buffer(buffer));
});
```

## License
MIT