/*

     File: AudioDevice.cpp 

 Abstract: CAPlayThough Classes. 

  Version: 1.2.2 

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*/ 

#include "AudioDevice.h"

void    AudioDevice::Init(AudioDeviceID devid, bool isInput)

{

    mID = devid;

    mIsInput = isInput;

    if (mID == kAudioDeviceUnknown) return;

    UInt32 propsize = sizeof(Float32);

    AudioObjectPropertyScope theScope = mIsInput ? kAudioDevicePropertyScopeInput : kAudioDevicePropertyScopeOutput;

    AudioObjectPropertyAddress theAddress = { kAudioDevicePropertySafetyOffset,

                                              theScope,

                                              0 }; // channel

    verify_noerr(AudioObjectGetPropertyData(mID,

                                            &theAddress,

                                            0,

                                            NULL,

                                            &propsize,

                                            &mSafetyOffset));

    propsize = sizeof(UInt32);

    theAddress.mSelector = kAudioDevicePropertyBufferFrameSize;

    verify_noerr(AudioObjectGetPropertyData(mID,

                                            &theAddress,

                                            0,

                                            NULL,

                                            &propsize,

                                            &mBufferSizeFrames));

    propsize = sizeof(AudioStreamBasicDescription);

    theAddress.mSelector = kAudioDevicePropertyStreamFormat;

    verify_noerr(AudioObjectGetPropertyData(mID,

                                            &theAddress,

                                            0,

                                            NULL,

                                            &propsize,

                                            &mFormat));

}

void    AudioDevice::SetBufferSize(UInt32 size)

{

    UInt32 propsize = sizeof(UInt32);

    AudioObjectPropertyScope theScope = mIsInput ? kAudioDevicePropertyScopeInput : kAudioDevicePropertyScopeOutput;

    AudioObjectPropertyAddress theAddress = { kAudioDevicePropertyBufferFrameSize,

                                              theScope,

                                              0 }; // channel

    verify_noerr(AudioObjectSetPropertyData(mID, &theAddress, 0, NULL, propsize, &size));

    verify_noerr(AudioObjectGetPropertyData(mID, &theAddress, 0, NULL, &propsize, &mBufferSizeFrames));

}

int     AudioDevice::CountChannels()

{

    OSStatus err;

    UInt32 propSize;

    int result = 0;

    AudioObjectPropertyScope theScope = mIsInput ? kAudioDevicePropertyScopeInput : kAudioDevicePropertyScopeOutput;

    AudioObjectPropertyAddress theAddress = { kAudioDevicePropertyStreamConfiguration,

                                              theScope,

                                              0 }; // channel

    err = AudioObjectGetPropertyDataSize(mID, &theAddress, 0, NULL, &propSize);

    if (err) return 0;

    AudioBufferList *buflist = (AudioBufferList *)malloc(propSize);

    err = AudioObjectGetPropertyData(mID, &theAddress, 0, NULL, &propSize, buflist);

    if (!err) {

        for (UInt32 i = 0; i < buflist->mNumberBuffers; ++i) {

            result += buflist->mBuffers[i].mNumberChannels;

        }

    }

    free(buflist);

    return result;

}

char *  AudioDevice::GetName(char *buf, UInt32 maxlen)

{

    AudioObjectPropertyScope theScope = mIsInput ? kAudioDevicePropertyScopeInput : kAudioDevicePropertyScopeOutput;

    AudioObjectPropertyAddress theAddress = { kAudioDevicePropertyDeviceName,

                                              theScope,

                                              0 }; // channel

    verify_noerr(AudioObjectGetPropertyData(mID, &theAddress, 0, NULL,  &maxlen, buf));

    return buf;

}