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AudioBackEnd.h
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AudioBackEnd.h
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/*
*
* This is based on Apple example software AudioBackEnd.cpp
*
* Copyright © 2004 Apple Computer, Inc., All Rights Reserved
* Original Apple code modified by Daniel Sumorok
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef __AudioBackEnd_H__
#define __AudioBackEnd_H__
#define checkErr( err) \
if(err) {\
OSStatus error = static_cast<OSStatus>(err);\
fprintf(stderr, "AudioBackEnd Error: %ld -> %s: %d\n", error,\
__FILE__, \
__LINE__\
);\
fflush(stdout);\
}
#include <CoreAudio/CoreAudio.h>
#include <AudioToolbox/AudioToolbox.h>
#include <AudioUnit/AudioUnit.h>
#include <pthread.h>
#include "AudioDevice.h"
typedef void (*playthruCallback)(void *arg);
class AudioBackEnd {
public:
AudioBackEnd(int bitsPerSample, int numChannels, int sampleRate);
~AudioBackEnd();
OSStatus Init();
OSStatus Start();
OSStatus Stop();
Boolean IsRunning();
void setCallback(playthruCallback func, void *arg);
UInt32 BufferSizeFrames();
int sendAudioBuffer(const void *buffer, int numFrames);
private:
OSStatus SetupGraph();
OSStatus CallbackSetup();
OSStatus SetupBuffers();
static OSStatus OutputProc(void *inRefCon,
AudioUnitRenderActionFlags *ioActionFlags,
const AudioTimeStamp *inTimeStamp,
UInt32 inBusNumber,
UInt32 inNumberFrames,
AudioBufferList * ioData);
AudioDevice mOutputDevice;
AUGraph mGraph;
AUNode mOutputNode;
AudioUnit mOutputUnit;
int mBitsPerSample;
int mSampleRate;
int mNumChannels;
playthruCallback mCallback;
void *mCallbackArg;
UInt32 mBufferSizeFrames;
UInt32 mFramesProcessed;
UInt8 *mAudioBuffer;
UInt32 mAudioBufferWriteIndex;
UInt32 mAudioBufferReadIndex;
UInt32 mBytesPerFrame;
UInt32 mAudioBufferSize;
};
#endif //__AudioBackEnd_H__