AUGraph

Transcript

1. AUGraph: скандалы, интриги, расследования Aliaksandr Andrashuk @lime_jelly
2. AudioUnit
3. AudioUnit Bus 0 Bus 1 Bus 0 Bus 0 Input scope Output scope Global scope AudioUnit
4. typedef  struct  OpaqueAudioComponentInstance  *       AudioComponentInstance; typedef  AudioComponentInstance  AudioUnit; AudioUnit  unit;
5. typedef  struct  AudioComponentDescription  {        OSType                            componentType;        OSType                            componentSubType;        OSType                            componentManufacturer;        UInt32                            componentFlags;        UInt32                            componentFlagsMask; }  AudioComponentDescription;
6. AU Types •Output •MusicEffect, MusicDevice •FormatConverter •Effect •Mixer •Panner •Generator •OfflineEffect •MIDIProcessor
7. iOS 7
8. Properties & Parameters Scheduled parameters
9. File Player Merger/ Mixer Reverb RemoteIO Speakers Microphone AUGraph
10. AUGraph •Initial •Opened •Initialized •Running
11. AUGraph graph; NewAUGraph(&graph); Create/Destroy AUGraph DisposeAUGraph(graph);
12. AudioComponentDescription acd = ...; AUNode node; AUGraphAddNode(graph, &acd, &node); Adding nodes
13. Connecting nodes AUNode node1 = ...; AUNode node2 = ...; AUGraphConnectNodeInput(graph, node1, 0, node2, 0);
14. Open/Close AUGraph AUGraphOpen(graph); AUGraphClose(graph);
15. OSStatus AUGraphNodeInfo( AUGraph inGraph, AUNode inNode, AudioComponentDescription * outDescription, AudioUnit * outAudioUnit);
16. Init/Uninit AUGraph AUGraphInitialize(graph); AUGraphUninitialize(graph);
17. Start/Stop AUGraph AUGraphStart(graph); AUGraphStop(graph);
18. #import  <AssertMacros.h> __Require_noErr __Check_noErr __Verify_noErr
19. __Require_noErr(NewAUGraph(&graph),  fail);   ... fail:   return  false;
20. AUGraph’s
21. AUFilePlayer RemoteIO
22. RemoteIO / VoiceProcessingIO •Audio input & output •Filters input audio •“Head” of AUGraph
23. AUFilePlayer •Plays some number of files (AudioFileID) •Can play only one file at moment •Plays only uncompressed audio
24. AUFilePlayer RemoteIO AUEffect •Filters (high, mid, low) •EQs •Delay •Pitch •etc
25. AUFilePlayer RemoteIO Merger/Mixer AUFilePlayer
26. AUMultiChannelMixer •Any number of inputs •One output •Volume & Pan for inputs
27. RemoteIO / GenericOutput AUGraph AUGraphAddRenderNotify Write to file AURenderCallback
28. GenericOutput AU •Start/Stop API •Offline audio processing
29. Custom input RemoteIO Mixer AUScheduledSoundPlayer RemoteIO Mixer AUGraphSetNodeInputCallback AURenderCallback
30. AUScheduledSoundPlayer •No inputs, one output •Can schedule slices of audio
31. AUCustom
32. AudioComponent AudioComponentRegister(        const  AudioComponentDescription  *      inDesc,        CFStringRef                                                  inName,        UInt32                                                            inVersion,        AudioComponentFactoryFunction              inFactory)
33. typedef  struct  AudioComponentPlugInInterface  {   OSStatus             (*Open)(void  *self,   AudioComponentInstance  mInstance);   OSStatus             (*Close)(void  *self);   AudioComponentMethod       (*Lookup)  (SInt16  selector);   void  *               reserved;  //  set  to  NULL }  AudioComponentPlugInInterface;
34. The end • http://developer.apple.com • http://idev.by/tag/audiounit/ • Learning Core Audio, A Hands-On Guide to Audio Programming for Mac and iOS. Chris Adamson, Kevin Avila.