iOS - Concatenate or generate audio

Build in support for .mp3, .m4a and .wav input audio files.

Usage

Add module:

var AudioMerger = require('com.composrapp.audiomerger');

Specify audioMergeType, audioFilesInput and audioFileOutput argumnets:

audioMergeType

Use concatenate or generate.

audioFilesInput

Concatenate example:

var concatenateAudios = [
  Ti.Filesystem.getFile(Ti.Filesystem.resourcesDirectory, '1.mp3').nativePath,
  Ti.Filesystem.getFile(Ti.Filesystem.resourcesDirectory, '2.mp3').nativePath,
  Ti.Filesystem.getFile(Ti.Filesystem.resourcesDirectory, '3.mp3').nativePath
].join();

Generate example:

var generateAudios = [
  { audio: Ti.Filesystem.getFile(Ti.Filesystem.resourcesDirectory, '140-drum.mp3').nativePath, timings: [0, 14000, 28000] },
  { audio: Ti.Filesystem.getFile(Ti.Filesystem.resourcesDirectory, '140-guitar.mp3').nativePath, timings: [0, 14000, 28000, 42000] }
];

If the bpm argument is provided to mergeAudio({ bpm: 140 }), timings will be handled as notes. When bpm is not specified they will be handled as milliseconds.

audioFileOutput

Should always end with .m4a.

Example:

var concatenatedAudio = Ti.Filesystem.getFile(Ti.Filesystem.applicationDataDirectory, 'example.m4a');

mergeAudio

Concatenate audio:

AudioMerger.mergeAudio({
  audioMergeType: 'concatenate',
  audioFilesInput: concatenateAudios,
  audioFileOutput: concatenatedAudio
});

Generate audio:

AudioMerger.mergeAudio({
  audioMergeType: 'generate',
  audioFilesInput: generateAudios,
  audioFileOutput: generatedAudio
});

eventListeners

AudioMerger.addEventListener('concatenate', function() {
  Ti.API.info('Concatenated audio');
});

AudioMerger.addEventListener('generate', function() {
  Ti.API.info('Generated audio');
});

AudioMerger.addEventListener('error', function() {
  Ti.API.error('Failed to merge audio');
});

Examples

Concatenate example:

var concatenateAudios = [
  Ti.Filesystem.getFile(Ti.Filesystem.resourcesDirectory, '1.mp3').nativePath,
  Ti.Filesystem.getFile(Ti.Filesystem.resourcesDirectory, '2.mp3').nativePath,
  Ti.Filesystem.getFile(Ti.Filesystem.resourcesDirectory, '3.mp3').nativePath
].join();
var concatenatedAudio = Ti.Filesystem.getFile(Ti.Filesystem.applicationDataDirectory, 'example.m4a');

AudioMerger.mergeAudio({
  audioMergeType: 'concatenate',
  audioFilesInput: concatenateAudios,
  audioFileOutput: concatenatedAudio
});

AudioMerger.addEventListener('concatenate', function() {
  Ti.API.info('Concatenated audio');
});

Generate example:

var generateAudios = [
  { 
    audio: Ti.Filesystem.getFile(Ti.Filesystem.applicationDataDirectory, '140-drum.mp3').nativePath,
    timings: [0, 14000, 28000]
  },
  { 
    audio: Ti.Filesystem.getFile(Ti.Filesystem.applicationDataDirectory, '140-guitar.mp3').nativePath,
    timings: [0, 14000, 28000, 42000]
  }
];
var generatedAudio = Ti.Filesystem.getFile(Ti.Filesystem.applicationDataDirectory, 'example.m4a');

AudioMerger.mergeAudio({
  audioMergeType: 'generate',
  audioFilesInput: generateAudios,
  audioFileOutput: generatedAudio
});

AudioMerger.addEventListener('generate', function() {
  Ti.API.info('Concatenated audio');
});

Generate example by BPM:

var generateAudios = [
  { 
    audio: Ti.Filesystem.getFile(Ti.Filesystem.applicationDataDirectory, '140-drum.mp3').nativePath,
    timings: [64, 128, 192]
  },
  { 
    audio: Ti.Filesystem.getFile(Ti.Filesystem.applicationDataDirectory, '140-guitar.mp3').nativePath,
    timings: [0, 64, 192]
  }
];
var generatedAudio = Ti.Filesystem.getFile(Ti.Filesystem.applicationDataDirectory, 'example.m4a');

AudioMerger.mergeAudio({
  audioMergeType: 'generate',
  audioFilesInput: generateAudios,
  audioFileOutput: generatedAudio,
  bpm: 140
});

AudioMerger.addEventListener('generate', function() {
  Ti.API.info('Concatenated audio');
});

Development

1. Install packages with npm install
2. Update examples in example/app.js
3. Use gulp ios to build and test the module

License

Copyright 2013-2014 Nick den Engelsman

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.