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, 3 months 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!)
#	Content
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__