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annotate src/audio/macosx/SDL_coreaudio.c @ 1029:f87f87efd45a

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Date: Mon, 17 Jan 2005 20:54:50 +0200 From: Ville [snip] Subject: [PATCH] SDL/DirectFB: remove Matrox CRTC2 flicker filter Hi, This patch removes the flicker filter option from the DirectFB backend's Matrox CRTC2 code in SDL. I will be removing the option from DirectFB (because it doesn't actually work) and that would cause the SDL code to fail without this fix. I was going to send this to some SDL list directly but libsdl.org is down so I'm not sure what if any lists there are. Thomas Jarosch (the guy who wrote the code) said you would accept SDL patches. Let me know if I should send this somewhere else. -- Ville Syrj�l� syrjala _at sci.fi http://www.sci.fi/~syrjala/
author Ryan C. Gordon <icculus@icculus.org>
date Mon, 17 Jan 2005 19:38:28 +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;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
126 while (remaining > 0) {
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
127 if (bufferOffset >= bufferSize) {
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parents:
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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parents:
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
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
135 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
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
Sam Lantinga <slouken@libsdl.org>
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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diff changeset
147 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
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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parents:
diff changeset
151 {
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
152 return;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
153 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
154
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
155 void Core_PlayAudio(_THIS)
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
156 {
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
157 return;
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parents:
diff changeset
158 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
159
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
160 Uint8 *Core_GetAudioBuf(_THIS)
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
161 {
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
162 return(NULL);
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
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>
parents:
diff changeset
165 void Core_CloseAudio(_THIS)
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
166 {
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
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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parents:
diff changeset
169
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
170 /* stop processing the audio unit */
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
171 result = AudioOutputUnitStop (outputAudioUnit);
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parents:
diff changeset
172 if (result != noErr) {
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
173 SDL_SetError("Core_CloseAudio: AudioOutputUnitStop");
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Sam Lantinga <slouken@libsdl.org>
parents:
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
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
177 /* Remove the input callback */
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parents:
diff changeset
178 callback.inputProc = 0;
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
179 callback.inputProcRefCon = 0;
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diff changeset
180 result = AudioUnitSetProperty (outputAudioUnit,
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parents:
diff changeset
181 kAudioUnitProperty_SetInputCallback,
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parents:
diff changeset
182 kAudioUnitScope_Input,
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
183 0,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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>
parents:
diff changeset
185 sizeof(callback));
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
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;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
189 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
190
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
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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parents:
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
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
196
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
197 free(buffer);
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
198 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
199
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
200 #define CHECK_RESULT(msg) \
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
201 if (result != noErr) { \
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
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
Sam Lantinga <slouken@libsdl.org>
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
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
208 {
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
209 OSStatus result = noErr;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
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
Sam Lantinga <slouken@libsdl.org>
parents: 935
diff changeset
212 struct AudioUnitInputCallback callback;
935
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
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,
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256 0,
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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 }