cwaudiofilesampler: An Objective-C repository from cwalo

##CWAudioFileSampler

I originally wrote this class for a drum machine app for iPad, but it could be utilized for any number of applications.

In use:

See https://github.com/cwalo/PHENOM-RBA for a project utilizing this class.

Declare an instance of CWAudioFileSampler
Call loadAudioURLS: passing an array of audio file URLs
Call loadAUFilePlayers
Play a sample by calling playSample passing an integer for the desired sample. They will be in the same order passed in loadAudioURLS:. 0 indexed!
When finished, call stopAndClosePlayers
To stop all audio, but keep everything in place call stopPlayers

Haven’t tried yet, but you should be able to use it for OS X by simply replacing:

outputcd.componentSubType = kAudioUnitSubType_RemoteIO;

with

outputcd.componentSubType = kAudioUnitSubType_DefaultOutput;

This class utilizes Chris Adamson’s AUGraph File Player implementation and his handy CoreAudio error checking method. Learning Core Audio is a must-have if you’re just getting into this stuff.

TODO:

Move away from the array of player AUGraphs and instead have a single AUGraph with dynamically created FilePlayer nodes. Will likely require a Mixer node. This will reduce the overhead and should result in sample-accurate playback.
Add error checking/handling in loadAudioURLS:

cwalo/cwaudiofilesampler