1 /*
2 Copyright (C) 2010 Grame
3 
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
8 
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 GNU General Public License for more details.
13 
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
17 
18 */
19 
20 #ifndef __TiPhoneCoreAudioRenderer__
21 #define __TiPhoneCoreAudioRenderer__
22 
23 #include <AudioToolbox/AudioConverter.h>
24 #include <AudioToolbox/AudioServices.h>
25 #include <AudioUnit/AudioUnit.h>
26 
27 #define MAX_CHANNELS 256
28 #define OPEN_ERR -1
29 #define NO_ERR 0
30 
31 typedef void (*AudioCallback) (int frames, float** inputs, float** outputs, void* arg);
32 
33 class TiPhoneCoreAudioRenderer
34 {
35 
36     private:
37 
38 		AudioUnit fAUHAL;
39         AudioCallback fAudioCallback;
40         void* fCallbackArg;
41 
42         int	fDevNumInChans;
43         int	fDevNumOutChans;
44 
45         AudioBufferList* fCAInputData;
46 
47         float* fInChannel[MAX_CHANNELS];
48         float* fOutChannel[MAX_CHANNELS];
49 
50 		static OSStatus Render(void *inRefCon,
51                                AudioUnitRenderActionFlags *ioActionFlags,
52                                const AudioTimeStamp *inTimeStamp,
53                                UInt32 inBusNumber,
54                                UInt32 inNumberFrames,
55                                AudioBufferList *ioData);
56 
57         static void InterruptionListener(void *inClientData, UInt32 inInterruption);
58 
59     public:
60 
TiPhoneCoreAudioRenderer(int input,int output)61         TiPhoneCoreAudioRenderer(int input, int output)
62             :fAudioCallback(NULL), fCallbackArg(NULL), fDevNumInChans(input), fDevNumOutChans(output), fCAInputData(NULL)
63         {
64             memset(fInChannel, 0, sizeof(float*) * MAX_CHANNELS);
65             memset(fOutChannel, 0, sizeof(float*) * MAX_CHANNELS);
66 
67             for (int i = 0; i < fDevNumInChans; i++) {
68                 fInChannel[i] = new float[8192];
69             }
70 
71             for (int i = 0; i < fDevNumOutChans; i++) {
72                 fOutChannel[i] = new float[8192];
73             }
74         }
75 
~TiPhoneCoreAudioRenderer()76         virtual ~TiPhoneCoreAudioRenderer()
77         {
78             for (int i = 0; i < fDevNumInChans; i++) {
79                 delete[] fInChannel[i];
80             }
81 
82             for (int i = 0; i < fDevNumOutChans; i++) {
83                 delete[] fOutChannel[i];
84             }
85 
86             if (fCAInputData) {
87                 for (int i = 0; i < fDevNumInChans; i++) {
88                     free(fCAInputData->mBuffers[i].mData);
89                 }
90                 free(fCAInputData);
91             }
92         }
93 
94         int Open(int bufferSize, int sampleRate);
95         int Close();
96 
97         int Start();
98         int Stop();
99 
SetAudioCallback(AudioCallback callback,void * arg)100         void SetAudioCallback(AudioCallback callback, void* arg)
101         {
102             fAudioCallback = callback;
103             fCallbackArg = arg;
104         }
105 
PerformAudioCallback(int frames)106         void PerformAudioCallback(int frames)
107         {
108             if (fAudioCallback) {
109                 fAudioCallback(frames, fInChannel, fOutChannel, fCallbackArg);
110             }
111         }
112 
113 };
114 
115 typedef TiPhoneCoreAudioRenderer * TiPhoneCoreAudioRendererPtr;
116 
117 #endif
118