Core audio
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CoreAudio allows creating audio graphs by adding nodes like mixers, effects, and remote I/O. Nodes are connected and audio units are added. Properties and parameters of audio units can be set and retrieved. Callbacks can be set on nodes. CoreMidi enables MIDI input and output by creating clients, ports, and sending MIDI events. Examples were provided.
![Enable MIDI out
[[MIDINetworkSession
defaultSession] setEnabled:YES]
MIDIClientCreate()
MIDIOutputPortCreate()](https://image.slidesharecdn.com/coreaudio-130121053427-phpapp02/85/Core-audio-16-320.jpg)
![Disable MIDI out
[[MIDINetworkSession
defaultSession] setEnabled:NO]
MIDIClientDispose()](https://image.slidesharecdn.com/coreaudio-130121053427-phpapp02/85/Core-audio-18-320.jpg)
Core audio
- 1. CoreAudio Cocoaheads 2013, Maxime Bokobza
- 2. HexASound
- 3. CoreAudio
- 4. CoreAudio Mixer Graph Effect RemoteIO
- 6. AudioComponentDescription componentManufacturer ex: kAudioUnitManufacturer_Apple componentType ex: kAudioUnitType_Mixer kAudioUnitType_Effect kAudioUnitType_Output componentSubType ex: kAudioUnitSubType_MultiChannelMixer kAudioUnitSubType_Delay kAudioUnitSubType_RemoteIO
- 8. AudioUnit AUGraphNodeInfo() Audio Unit Properties Audio Unit Parameters
- 10. Audio Unit Parameters AudioUnitSetParameter() AudioUnitGetParameter() ParameterID ex: kBandpassParam_CenterFrequency kMultiChannelMixerParam_Volume
- 11. AURenderCallbackStruct AUGraphSetNodeInputCallback() static OSStatus renderInput( !void *inRefCon, !AudioUnitRenderActionFlags *ioActionFlags, !const AudioTimeStamp *inTimeStamp, !UInt32 inBusNumber, !UInt32 inNumberFrames, !AudioBufferList *ioData)
- 12. Links • http://www.dribin.org/dave/resources/ files/2010/ ipdcchi_Dribin_AudioUnits.pdf • http://izotope.fileburst.com/guides/ iZotope_iOS_Audio_Programming_Guide.pdf • http://www.subfurther.com/blog/ 2009/04/28/an-iphone-core-audio-brain- dump/ • http://www.slideshare.net/invalidname/ core-audio-cranks-it-up
- 14. One more thing
- 15. CoreMidi
- 16. Enable MIDI out [[MIDINetworkSession defaultSession] setEnabled:YES] MIDIClientCreate() MIDIOutputPortCreate()
- 18. Disable MIDI out [[MIDINetworkSession defaultSession] setEnabled:NO] MIDIClientDispose()
- 19. Links •http://goodliffe.blogspot.fr/ 2010/10/using-coremidi-in- ios-example.html?m=1 •https://github.com/ petegoodliffe/PGMidi •http://www.onicos.com/staff/ iz/formats/midi-event.html