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ComplexPlayThru.h

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#ifndef __ComplexPlayThru_H__
#define __ComplexPlayThru_H__

#define RT_BUFFERSIZE 512

#define checkErr( err) \
if(err) {\
        OSStatus error = static_cast<OSStatus>(err);\
                fprintf(stderr, "ComplexPlayThru Error: %ld ->  %s:  %d\n",  error,\
                           __FILE__, \
                           __LINE__\
                           );\
                                   fflush(stdout);\
}

#include <CoreAudio/CoreAudio.h>
#include <AudioToolbox/AudioToolbox.h>
#include <AudioUnit/AudioUnit.h>
#include "AudioRingBuffer2.h"
#include "AudioDevice.h"

class ComplexPlayThru
{
public:
        ComplexPlayThru(); // adding this to use default devices -ma++
        ComplexPlayThru(AudioDeviceID input, AudioDeviceID output);
        ~ComplexPlayThru();
        OSStatus Init(AudioDeviceID input, AudioDeviceID output);
        OSStatus Start();
        OSStatus Stop();
        Boolean IsRunning();
        OSStatus SetInputDeviceAsCurrent(AudioDeviceID in);
        OSStatus SetOutputDeviceAsCurrent(AudioDeviceID out);
private:
        OSStatus SetupGraph(AudioDeviceID out);
        OSStatus MakeGraph();

        OSStatus SetupAUHAL(AudioDeviceID in);
        OSStatus EnableIO();
        OSStatus CallbackSetup();
        OSStatus SetupBuffers();
        OSStatus MapChannels();

        void ComputeThruOffset();

        static OSStatus InputProc(void *inRefCon,
                                                          AudioUnitRenderActionFlags *ioActionFlags,
                                                          const AudioTimeStamp *inTimeStamp,
                                                          UInt32                                inBusNumber,
                                                          UInt32                                inNumberFrames,
                                                          AudioBufferList *             ioData);

        static OSStatus OutputProc(void *inRefCon,
                                                           AudioUnitRenderActionFlags *ioActionFlags,
                                                           const AudioTimeStamp *inTimeStamp,
                                                           UInt32                               inBusNumber,
                                                           UInt32                               inNumberFrames,
                                                           AudioBufferList *    ioData);

        static OSStatus DeviceSampleRateListener(AudioDeviceID  inDevice,
                                                                UInt32                                  inChannel,
                                                                Boolean                                 isInput,
                                                                AudioDevicePropertyID   inPropertyID,
                                                                void*                                   inClientData);

        AudioUnit mInputUnit;
        AudioBufferList *mInputBuffer;
        AudioDevice mInputDevice, mOutputDevice;
        AudioRingBuffer *mBuffer;

        //AudioUnits and Graph
        AUGraph mGraph;
        AUNode mVarispeedNode;
        AudioUnit mVarispeedUnit;
        AUNode mOutputNode;
        AudioUnit mOutputUnit;

        //Buffer sample info
        Float64 mFirstInputTime;
        Float64 mFirstOutputTime;
        Float64 mInToOutSampleOffset;
};

#endif //__ComplexPlayThru_H__

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