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POCore Audio: kAudioOutputUnitProperty_SetInputCallback on a non-remoteIO unit
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2013-04-22T11:59:13.510
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I'm new to Core Audio so I might not see something obvious… My aim is to process previously recorded audio signals. However, those signals should be filtered first. I don't need to play any audio. I only need to record and process it. My graph looks like that: RemoteIO --> HighPassFilter --> callback (process audio) And I set it up like this: <pre><code>LBAudioDetectiveGetDefaultFormat(&detective->streamFormat); // Create new AUGraph OSStatus error = NewAUGraph(&detective->graph); LBErrorCheck(error); // Initialize AUNodes AudioComponentDescription rioCD = {0}; rioCD.componentType = kAudioUnitType_Output; rioCD.componentSubType = kAudioUnitSubType_RemoteIO; rioCD.componentManufacturer = kAudioUnitManufacturer_Apple; AUNode rioNode; error = AUGraphAddNode(detective->graph, &rioCD, &rioNode); LBErrorCheck(error); AudioComponentDescription filterCD = {0}; filterCD.componentType = kAudioUnitType_Effect; filterCD.componentSubType = kAudioUnitSubType_HighPassFilter; filterCD.componentManufacturer = kAudioUnitManufacturer_Apple; AUNode filterNode; error = AUGraphAddNode(detective->graph, &filterCD, &filterNode); LBErrorCheck(error); // Open the graph so I can modify the AudioUnits error = AUGraphOpen(detective->graph); // Adapt rioUnit error = AUGraphNodeInfo(detective->graph, rioNode, NULL, &detective->rioUnit); LBErrorCheck(error); UInt32 onFlag = 1; AudioUnitElement bus1 = 1; UInt32 propertySize = sizeof(UInt32); error = AudioUnitSetProperty(detective->rioUnit, kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Input, bus1, &onFlag, propertySize); LBErrorCheck(error); propertySize = sizeof(AudioStreamBasicDescription); error = AudioUnitSetProperty(detective->rioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, bus1, &detective->streamFormat, propertySize); LBErrorCheck(error); // Adapt filterUnit error = AUGraphNodeInfo(detective->graph, filterNode, NULL, &detective->filterUnit); LBErrorCheck(error); AURenderCallbackStruct callback = {0}; callback.inputProc = _LBAudioDetectiveFilterOutput; callback.inputProcRefCon = detective; propertySize = sizeof(AURenderCallbackStruct); error = AudioUnitSetProperty(detective->filterUnit, kAudioOutputUnitProperty_SetInputCallback, kAudioUnitScope_Global, 0, &callback, propertySize); LBErrorCheck(error); // Connect the two units AudioUnitElement bus0 = 0; error = AUGraphConnectNodeInput(detective->graph, rioNode, bus1, filterNode, bus0); LBErrorCheck(error); AUGraphInitialize(detective->graph); </code></pre> My code fails with the error -10879 when I try to set the callback. I'm assuming that the filter audio unit doesn't support this property. How am I supposed to get the recorded sound then? A second generic output unit isn't allowed as far as I know. Thanks for your help in advance
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<ios><cocoa><core-audio><audiounit><remoteio>
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Core Audio: kAudioOutputUnitProperty_SetInputCallback on a non-remoteIO unit
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