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annotate src/audio/macosx/SDL_coreaudio.c @ 955:d74fbf56f2f6

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Date: Fri, 25 Jun 2004 13:29:15 +0100 From: "alan buckley" Subject: Modification for RISC OS version of SDL Ive attached a zip file with the changes to this email, it contains the following: The file sdldiff.txt is the output from cvs diff u. . The directory thread/riscos contains all the new files to support threading. Readme.riscos is a new readme file to add.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 17 Sep 2004 13:20:10 +0000
parents 84f930aebaeb
children c9b51268668f
rev   line source
935
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 #include <AudioUnit/AudioUnit.h>
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29
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30 #include <assert.h>
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31 #include <stdlib.h>
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32 #include <stdio.h>
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33 #include <string.h>
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34
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35 #include "SDL_endian.h"
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36 #include "SDL_audio.h"
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37 #include "SDL_audio_c.h"
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38 #include "SDL_audiomem.h"
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39 #include "SDL_sysaudio.h"
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40 #include "SDL_coreaudio.h"
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41
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42
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43 /* Audio driver functions */
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44
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45 static int Core_OpenAudio(_THIS, SDL_AudioSpec *spec);
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46 static void Core_WaitAudio(_THIS);
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47 static void Core_PlayAudio(_THIS);
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48 static Uint8 *Core_GetAudioBuf(_THIS);
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49 static void Core_CloseAudio(_THIS);
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50
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51 /* Audio driver bootstrap functions */
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52
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53 static int Audio_Available(void)
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54 {
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55 return(1);
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56 }
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57
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58 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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59 {
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60 free(device->hidden);
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61 free(device);
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62 }
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63
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64 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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65 {
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66 SDL_AudioDevice *this;
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67
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68 /* Initialize all variables that we clean on shutdown */
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69 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice));
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70 if ( this ) {
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71 memset(this, 0, (sizeof *this));
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72 this->hidden = (struct SDL_PrivateAudioData *)
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73 malloc((sizeof *this->hidden));
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74 }
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75 if ( (this == NULL) || (this->hidden == NULL) ) {
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76 SDL_OutOfMemory();
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77 if ( this ) {
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78 free(this);
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79 }
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80 return(0);
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81 }
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82 memset(this->hidden, 0, (sizeof *this->hidden));
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83
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84 /* Set the function pointers */
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85 this->OpenAudio = Core_OpenAudio;
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86 this->WaitAudio = Core_WaitAudio;
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87 this->PlayAudio = Core_PlayAudio;
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88 this->GetAudioBuf = Core_GetAudioBuf;
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89 this->CloseAudio = Core_CloseAudio;
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90
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91 this->free = Audio_DeleteDevice;
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92
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93 return this;
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94 }
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95
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96 AudioBootStrap COREAUDIO_bootstrap = {
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97 "coreaudio", "Mac OS X CoreAudio",
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98 Audio_Available, Audio_CreateDevice
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99 };
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100
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101 /* The CoreAudio callback */
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102 static OSStatus audioCallback (void *inRefCon,
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103 AudioUnitRenderActionFlags inActionFlags,
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104 const AudioTimeStamp *inTimeStamp,
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105 UInt32 inBusNumber,
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106 AudioBuffer *ioData)
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107 {
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108 SDL_AudioDevice *this = (SDL_AudioDevice *)inRefCon;
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109 UInt32 remaining, len;
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110 void *ptr;
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111
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112 /* Only do anything if audio is enabled and not paused */
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113 if ( ! this->enabled || this->paused ) {
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114 memset(ioData->mData, this->spec.silence, ioData->mDataByteSize);
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115 return 0;
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116 }
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117
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118 /* No SDL conversion should be needed here, ever, since we accept
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119 any input format in OpenAudio, and leave the conversion to CoreAudio.
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120 */
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121 assert(!this->convert.needed);
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122 assert(this->spec.channels == ioData->mNumberChannels);
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123
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124 remaining = ioData->mDataByteSize;
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125 ptr = ioData->mData;
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126 while (remaining > 0) {
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diff changeset
127 if (bufferOffset >= bufferSize) {
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diff changeset
128 /* Generate the data */
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parents:
diff changeset
129 memset(buffer, this->spec.silence, bufferSize);
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parents:
diff changeset
130 SDL_mutexP(this->mixer_lock);
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parents:
diff changeset
131 (*this->spec.callback)(this->spec.userdata,
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diff changeset
132 buffer, bufferSize);
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
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diff changeset
133 SDL_mutexV(this->mixer_lock);
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diff changeset
134 bufferOffset = 0;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
135 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
136
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
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diff changeset
137 len = bufferSize - bufferOffset;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
138 if (len > remaining)
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
139 len = remaining;
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diff changeset
140 memcpy(ptr, buffer + bufferOffset, len);
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diff changeset
141 ptr += len;
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diff changeset
142 remaining -= len;
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diff changeset
143 bufferOffset += len;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
144 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
145
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
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diff changeset
146 return 0;
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
147 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
148
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diff changeset
149 /* Dummy functions -- we don't use thread-based audio */
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diff changeset
150 void Core_WaitAudio(_THIS)
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diff changeset
151 {
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diff changeset
152 return;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
153 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
154
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
155 void Core_PlayAudio(_THIS)
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diff changeset
156 {
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diff changeset
157 return;
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diff changeset
158 }
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parents:
diff changeset
159
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
160 Uint8 *Core_GetAudioBuf(_THIS)
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diff changeset
161 {
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diff changeset
162 return(NULL);
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diff changeset
163 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
164
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
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diff changeset
165 void Core_CloseAudio(_THIS)
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
166 {
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diff changeset
167 OSStatus result;
936
84f930aebaeb CoreAudio driver works on Mac OSX 10.1
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parents: 935
diff changeset
168 struct AudioUnitInputCallback callback;
935
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diff changeset
169
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
170 /* stop processing the audio unit */
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parents:
diff changeset
171 result = AudioOutputUnitStop (outputAudioUnit);
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diff changeset
172 if (result != noErr) {
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
173 SDL_SetError("Core_CloseAudio: AudioOutputUnitStop");
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diff changeset
174 return;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
175 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
176
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
177 /* Remove the input callback */
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diff changeset
178 callback.inputProc = 0;
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diff changeset
179 callback.inputProcRefCon = 0;
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diff changeset
180 result = AudioUnitSetProperty (outputAudioUnit,
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diff changeset
181 kAudioUnitProperty_SetInputCallback,
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diff changeset
182 kAudioUnitScope_Input,
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
183 0,
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
184 &callback,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
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diff changeset
185 sizeof(callback));
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
186 if (result != noErr) {
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
187 SDL_SetError("Core_CloseAudio: AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)");
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diff changeset
188 return;
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parents:
diff changeset
189 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
190
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
191 result = CloseComponent(outputAudioUnit);
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diff changeset
192 if (result != noErr) {
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diff changeset
193 SDL_SetError("Core_CloseAudio: CloseComponent");
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
194 return;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
195 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
196
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
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diff changeset
197 free(buffer);
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diff changeset
198 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
199
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
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diff changeset
200 #define CHECK_RESULT(msg) \
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
201 if (result != noErr) { \
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
202 SDL_SetError("Failed to start CoreAudio: " msg); \
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
203 return -1; \
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
204 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
205
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
206
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
207 int Core_OpenAudio(_THIS, SDL_AudioSpec *spec)
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
208 {
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
209 OSStatus result = noErr;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
210 Component comp;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
211 ComponentDescription desc;
936
84f930aebaeb CoreAudio driver works on Mac OSX 10.1
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parents: 935
diff changeset
212 struct AudioUnitInputCallback callback;
935
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
213 AudioStreamBasicDescription requestedDesc;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
214
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
215 /* Setup a AudioStreamBasicDescription with the requested format */
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
216 requestedDesc.mFormatID = kAudioFormatLinearPCM;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
217 requestedDesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
218 requestedDesc.mChannelsPerFrame = spec->channels;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
219 requestedDesc.mSampleRate = spec->freq;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
220
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
221 requestedDesc.mBitsPerChannel = spec->format & 0xFF;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
222 if (spec->format & 0x8000)
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
223 requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
224 if (spec->format & 0x1000)
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
225 requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
226
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
227 requestedDesc.mFramesPerPacket = 1;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
228 requestedDesc.mBytesPerFrame = requestedDesc.mBitsPerChannel * requestedDesc.mChannelsPerFrame / 8;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
229 requestedDesc.mBytesPerPacket = requestedDesc.mBytesPerFrame * requestedDesc.mFramesPerPacket;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
230
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
231
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
232 /* Locate the default output audio unit */
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
233 desc.componentType = kAudioUnitComponentType;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
234 desc.componentSubType = kAudioUnitSubType_Output;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
235 desc.componentManufacturer = kAudioUnitID_DefaultOutput;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
236 desc.componentFlags = 0;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
237 desc.componentFlagsMask = 0;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
238
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
239 comp = FindNextComponent (NULL, &desc);
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
240 if (comp == NULL) {
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
241 SDL_SetError ("Failed to start CoreAudio: FindNextComponent returned NULL");
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
242 return -1;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
243 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
244
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
245 /* Open & initialize the default output audio unit */
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
246 result = OpenAComponent (comp, &outputAudioUnit);
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
247 CHECK_RESULT("OpenAComponent")
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
248
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
249 result = AudioUnitInitialize (outputAudioUnit);
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
250 CHECK_RESULT("AudioUnitInitialize")
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
251
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
252 /* Set the input format of the audio unit. */
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
253 result = AudioUnitSetProperty (outputAudioUnit,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
254 kAudioUnitProperty_StreamFormat,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
255 kAudioUnitScope_Input,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
256 0,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
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257 &requestedDesc,
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258 sizeof (requestedDesc));
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259 CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_StreamFormat)")
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260
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261 /* Set the audio callback */
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262 callback.inputProc = audioCallback;
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263 callback.inputProcRefCon = this;
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264 result = AudioUnitSetProperty (outputAudioUnit,
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265 kAudioUnitProperty_SetInputCallback,
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266 kAudioUnitScope_Input,
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267 0,
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268 &callback,
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269 sizeof(callback));
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270 CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)")
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271
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272 /* Calculate the final parameters for this audio specification */
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273 SDL_CalculateAudioSpec(spec);
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274
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275 /* Allocate a sample buffer */
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276 bufferOffset = bufferSize = this->spec.size;
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277 buffer = malloc(bufferSize);
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278 assert(buffer);
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279
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280 /* Finally, start processing of the audio unit */
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281 result = AudioOutputUnitStart (outputAudioUnit);
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282 CHECK_RESULT("AudioOutputUnitStart")
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283
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284
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285 /* We're running! */
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286 return(1);
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287 }