src/MacOSX/AudioBackEnd.h

/*
 *
 * 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(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__
Revision:	1.1
Committed:	2006-07-28T13:15:18Z (18 years ago) by nigel
Content type:	text/plain
Branch:	MAIN
CVS Tags:	nigel-build-19, HEAD
Log Message:	Working audio output by Daniel Sumorok. Not quite the way I wanted to do it but it will do for now. (on a real Mac, the real audio hardware should be able to pull/grab the data from our buffers - an extra thread with its own set of buffers is wasteful!)
#	User	Rev	Content
1	nigel	1.1	/*
2			*
3			* This is based on Apple example software AudioBackEnd.cpp
4			*
5			* Copyright © 2004 Apple Computer, Inc., All Rights Reserved
6			* Original Apple code modified by Daniel Sumorok
7			*
8			* This program is free software; you can redistribute it and/or modify
9			* it under the terms of the GNU General Public License as published by
10			* the Free Software Foundation; either version 2 of the License, or
11			* (at your option) any later version.
12			*
13			* This program is distributed in the hope that it will be useful,
14			* but WITHOUT ANY WARRANTY; without even the implied warranty of
15			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16			* GNU General Public License for more details.
17			*
18			* You should have received a copy of the GNU General Public License
19			* along with this program; if not, write to the Free Software
20			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21			*/
22
23			#ifndef __AudioBackEnd_H__
24			#define __AudioBackEnd_H__
25
26			#define checkErr( err) \
27			if(err) {\
28			OSStatus error = static_cast<OSStatus>(err);\
29			fprintf(stderr, "AudioBackEnd Error: %ld -> %s: %d\n", error,\
30			__FILE__, \
31			__LINE__\
32			);\
33			fflush(stdout);\
34			}
35
36			#include <CoreAudio/CoreAudio.h>
37			#include <AudioToolbox/AudioToolbox.h>
38			#include <AudioUnit/AudioUnit.h>
39			#include <pthread.h>
40			#include "AudioDevice.h"
41
42			typedef void (playthruCallback)(void arg);
43
44			class AudioBackEnd {
45			public:
46			AudioBackEnd(int bitsPerSample, int numChannels, int sampleRate);
47			~AudioBackEnd();
48			OSStatus Init();
49			OSStatus Start();
50			OSStatus Stop();
51			Boolean IsRunning();
52			void setCallback(playthruCallback func, void *arg);
53			UInt32 BufferSizeFrames();
54			int sendAudioBuffer(void *buffer, int numFrames);
55			private:
56			OSStatus SetupGraph();
57			OSStatus CallbackSetup();
58			OSStatus SetupBuffers();
59
60			static OSStatus OutputProc(void *inRefCon,
61			AudioUnitRenderActionFlags *ioActionFlags,
62			const AudioTimeStamp *inTimeStamp,
63			UInt32 inBusNumber,
64			UInt32 inNumberFrames,
65			AudioBufferList * ioData);
66
67			AudioDevice mOutputDevice;
68
69			AUGraph mGraph;
70			AUNode mOutputNode;
71			AudioUnit mOutputUnit;
72			int mBitsPerSample;
73			int mSampleRate;
74			int mNumChannels;
75			playthruCallback mCallback;
76			void *mCallbackArg;
77			UInt32 mBufferSizeFrames;
78			UInt32 mFramesProcessed;
79			UInt8 *mAudioBuffer;
80			UInt32 mAudioBufferWriteIndex;
81			UInt32 mAudioBufferReadIndex;
82			UInt32 mBytesPerFrame;
83			UInt32 mAudioBufferSize;
84			};
85
86			#endif //__AudioBackEnd_H__