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AudioDevice.cpp

/*      Copyright:      © Copyright 2004 Apple Computer, Inc. All rights reserved.

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/*=============================================================================
        AudioDevice.cpp

=============================================================================*/

#include "AudioDevice.h"

void    AudioDevice::Init(AudioDeviceID devid, bool isInput)
{
        mID = devid;
        mIsInput = isInput;
        if (mID == kAudioDeviceUnknown) return;

        UInt32 propsize;

        propsize = sizeof(UInt32);
        verify_noerr(AudioDeviceGetProperty(mID, 0, mIsInput, kAudioDevicePropertySafetyOffset, &propsize, &mSafetyOffset));

        propsize = sizeof(UInt32);
        verify_noerr(AudioDeviceGetProperty(mID, 0, mIsInput, kAudioDevicePropertyBufferFrameSize, &propsize, &mBufferSizeFrames));

        propsize = sizeof(AudioStreamBasicDescription);
        verify_noerr(AudioDeviceGetProperty(mID, 0, mIsInput, kAudioDevicePropertyStreamFormat, &propsize, &mFormat));

}

void    AudioDevice::SetBufferSize(UInt32 size)
{
        UInt32 propsize = sizeof(UInt32);
        verify_noerr(AudioDeviceSetProperty(mID, NULL, 0, mIsInput, kAudioDevicePropertyBufferFrameSize, propsize, &size));

        propsize = sizeof(UInt32);
        verify_noerr(AudioDeviceGetProperty(mID, 0, mIsInput, kAudioDevicePropertyBufferFrameSize, &propsize, &mBufferSizeFrames));
}

int             AudioDevice::CountChannels()
{
        OSStatus err;
        UInt32 propSize;
        int result = 0;

        err = AudioDeviceGetPropertyInfo(mID, 0, mIsInput, kAudioDevicePropertyStreamConfiguration, &propSize, NULL);
        if (err) return 0;

        AudioBufferList *buflist = (AudioBufferList *)malloc(propSize);
        err = AudioDeviceGetProperty(mID, 0, mIsInput, kAudioDevicePropertyStreamConfiguration, &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)
{
        verify_noerr(AudioDeviceGetProperty(mID, 0, mIsInput, kAudioDevicePropertyDeviceName, &maxlen, buf));
        return buf;
}

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