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https://github.com/tonistiigi/audiosprite

Jukebox/Howler/CreateJS compatible audio sprite generator
https://github.com/tonistiigi/audiosprite

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Jukebox/Howler/CreateJS compatible audio sprite generator

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README 

        
[![Build Status](https://secure.travis-ci.org/tonistiigi/audiosprite.png)](http://travis-ci.org/tonistiigi/audiosprite)



### What?



This is a `ffmpeg` wrapper that will take in **multiple audio files** and combines them **into a single file**. Silent gaps will be put between the parts so that every new part starts from full second and there is at least 1 second pause between every part. The final file will be exported in `mp3`, `ogg`, `ac3`, `m4a` and `caf`(IMA-ADPCM) to support as many devices as possible. This tool will also generate a `JSON` file that is compatible with [Howler.js](https://github.com/goldfire/howler.js) or [zynga/jukebox](https://github.com/zynga/jukebox) framework.



### Why?



iOS, Windows Phone and some Android phones have very limited HTML5 audio support. They only support playing a single file at a time and loading in new files requires user interaction and has a big latency. To overcome this there is a technique to combine all audio into single file and only play/loop certain parts of that file. [zynga/jukebox](https://github.com/zynga/jukebox) is a audio framework that uses this technique.  [digitalfruit/limejs](https://github.com/digitalfruit/limejs) is a HTML5 game framework that includes Jukebox and lets you add audio to your games using audio sprites.



### Installation



#### via npm package

```

npm install -g audiosprite

```



### via github (latest)

```

npm install -g git+https://github.com/tonistiigi/audiosprite.git

```



#### Dependencies

You can install `FFmpeg` and the `ogg` codecs on OSX using `brew`:



```

brew install ffmpeg --with-theora --with-libvorbis

```



#### Hints for Windows users



- You need to install [Node.js](https://www.nodejs.org/)

- Use [Git Bash](http://git-scm.com/download/win) instead of Command Line or Powershell

- Download [ffmpeg](http://ffmpeg.zeranoe.com/builds/) and include it in your path `export PATH=$PATH:path/to/ffmpeg/bin`

- IMA-ADPCM(the fastest iPhone format) will only be generated if you are using OSX.



### Usage



```

> audiosprite --help

info: Usage: audiosprite [options] file1.mp3 file2.mp3 *.wav

info: Options:

  --output, -o          Name for the output files.                                               [default: "output"]

  --path, -u            Path for files to be used on final JSON.                                 [default: ""]

  --export, -e          Limit exported file types. Comma separated extension list.               [default: "ogg,m4a,mp3,ac3"]

  --format, -f          Format of the output JSON file (jukebox, howler, howler2, createjs).     [default: "jukebox"]

  --log, -l             Log level (debug, info, notice, warning, error).                         [default: "info"]

  --autoplay, -a        Autoplay sprite name.                                                    [default: null]

  --loop                Loop sprite name, can be passed multiple times.                          [default: null]

  --silence, -s         Add special "silence" track with specified duration.                     [default: 0]

  --gap, -g             Silence gap between sounds (in seconds).                                 [default: 1]

  --minlength, -m       Minimum sound duration (in seconds).                                     [default: 0]

  --bitrate, -b         Bit rate. Works for: ac3, mp3, mp4, m4a, ogg.                            [default: 128]

  --vbr, -v             VBR [0-9]. Works for: mp3. -1 disables VBR.                              [default: -1]

  --samplerate, -r      Sample rate.                                                             [default: 44100]

  --channels, -c        Number of channels (1=mono, 2=stereo).                                   [default: 1]

  --rawparts, -p        Include raw slices(for Web Audio API) in specified formats.              [default: ""]

  --ignorerounding, -i  Bypass sound placement on whole second boundaries (0=round,1=bypass).    [default: 0]

  --help, -h            Show this help message.



> audiosprite --autoplay bg_loop --output mygameaudio bg_loop.wav *.mp3

info: File added OK file=bg_loop.wav

info: 1.25s silence gap added OK

info: File added OK file=click.mp3

info: 1.70s silence gap added OK

info: Exported caf OK file=mygameaudio.caf

info: Exported ac3 OK file=mygameaudio.ac3

info: Exported mp3 OK file=mygameaudio.mp3

info: Exported m4a OK file=mygameaudio.m4a

info: Exported ogg OK file=mygameaudio.ogg

info: Exported json OK file=mygameaudio.json

info: All done



> cat mygameaudio.json

{

  "resources": [

    "mygameaudio.caf",

    "mygameaudio.ac3",

    "mygameaudio.mp3",

    "mygameaudio.m4a",

    "mygameaudio.ogg"

  ],

  "spritemap": {

    "bg_loop": {

      "start": 0,

      "end": 3.75,

      "loop": true

    },

    "click": {

      "start": 5,

      "end": 5.3,

      "loop": false

    }

  },

  "autoplay": "bg_loop"

}

```



### API Usage

```js

var audiosprite = require('audiosprite')



var files = ['file1.mp3', 'file2.mp3']

var opts = {output: 'result'}



audiosprite(files, opts, function(err, obj) {

  if (err) return console.error(err)



  console.log(JSON.stringify(obj, null, 2))

})

```



#### Setting autoplay track



You can use `--autoplay` option to set a track that will start playing automatically. This track is then marked as autoplay and looping in the JSON. This syntax is Jukebox framework specific.



#### Custom silent track



On some cases starting and pausing a file has bigger latency than just setting playhead position. You may get better results if your file is always playing. `--silence ` option will generate extra track named *silence* that you can play instead of pausing the file.



#### Usage with [digitalfruit/limejs](https://github.com/digitalfruit/limejs) framework.



First generate LimeJS asset from the JSON file that you can require inside your code.



```

> bin/lime.py gensoy path/to/mygameaudio.json

```



Then use `AudioMap` class to play the file.



```javascript

goog.require('lime.audio.AudioMap');

goog.require('lime.ASSETS.mygameaudio.json');



var audio = new lime.audio.AudioMap(lime.ASSETS.mygameaudio.json);

...

audio.play('click');

```



*Don't forget to use the `--rawparts=mp3` option to benefit from the LimeJS feature to automatically switch to Web Audio API when it's supported by the client.*



#### Usage with [zynga/jukebox](https://github.com/zynga/jukebox) framework. (DISCONTINUED)



*NOTE: The jukebox project from Zynga has been abandoned. This section remains for reference.*



Generated JSON file can be passed straight into `jukebox.Player` constructor. Check out Jukebox documentation/demos for more info.



```javascript

var settings = {/* JSON generated by audiosprite*/};

...

// This part needs to be in user event callback.

var myPlayer = new jukebox.Player(settings);

...

myPlayer.play('click');

```