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annotate src/audio/macosx/SDL_coreaudio.c @ 3848:4de14c915f4c SDL-1.2

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Updated the snapshot build target to reflect the new source location
author Sam Lantinga <slouken@libsdl.org>
date Mon, 10 Jul 2006 21:23:11 +0000
parents dc6b59e925a2
children 782fd950bd46 c121d94672cb 9df8136abec0
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 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 Lesser 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 Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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 #include "SDL_config.h"
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23
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24 #include <AudioUnit/AudioUnit.h>
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25
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26 #include "SDL_audio.h"
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27 #include "../SDL_audio_c.h"
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28 #include "../SDL_sysaudio.h"
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29 #include "SDL_coreaudio.h"
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30
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31
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32 /* Audio driver functions */
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33
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34 static int Core_OpenAudio(_THIS, SDL_AudioSpec *spec);
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35 static void Core_WaitAudio(_THIS);
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36 static void Core_PlayAudio(_THIS);
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37 static Uint8 *Core_GetAudioBuf(_THIS);
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38 static void Core_CloseAudio(_THIS);
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39
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40 /* Audio driver bootstrap functions */
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41
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42 static int Audio_Available(void)
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43 {
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44 return(1);
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45 }
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46
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47 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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48 {
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49 SDL_free(device->hidden);
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50 SDL_free(device);
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51 }
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52
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53 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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54 {
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55 SDL_AudioDevice *this;
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56
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57 /* Initialize all variables that we clean on shutdown */
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58 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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59 if ( this ) {
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60 SDL_memset(this, 0, (sizeof *this));
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61 this->hidden = (struct SDL_PrivateAudioData *)
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62 SDL_malloc((sizeof *this->hidden));
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63 }
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64 if ( (this == NULL) || (this->hidden == NULL) ) {
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65 SDL_OutOfMemory();
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66 if ( this ) {
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67 SDL_free(this);
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68 }
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69 return(0);
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70 }
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71 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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72
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73 /* Set the function pointers */
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74 this->OpenAudio = Core_OpenAudio;
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75 this->WaitAudio = Core_WaitAudio;
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76 this->PlayAudio = Core_PlayAudio;
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77 this->GetAudioBuf = Core_GetAudioBuf;
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78 this->CloseAudio = Core_CloseAudio;
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79
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80 this->free = Audio_DeleteDevice;
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81
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82 return this;
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83 }
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84
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85 AudioBootStrap COREAUDIO_bootstrap = {
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86 "coreaudio", "Mac OS X CoreAudio",
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87 Audio_Available, Audio_CreateDevice
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88 };
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89
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90 /* The CoreAudio callback */
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91 static OSStatus audioCallback (void *inRefCon,
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92 AudioUnitRenderActionFlags inActionFlags,
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93 const AudioTimeStamp *inTimeStamp,
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94 UInt32 inBusNumber,
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95 AudioBuffer *ioData)
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96 {
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97 SDL_AudioDevice *this = (SDL_AudioDevice *)inRefCon;
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98 UInt32 remaining, len;
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99 void *ptr;
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100
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101 /* Only do anything if audio is enabled and not paused */
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102 if ( ! this->enabled || this->paused ) {
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103 SDL_memset(ioData->mData, this->spec.silence, ioData->mDataByteSize);
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104 return 0;
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105 }
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106
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107 /* No SDL conversion should be needed here, ever, since we accept
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108 any input format in OpenAudio, and leave the conversion to CoreAudio.
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109 */
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110 /*
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111 assert(!this->convert.needed);
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112 assert(this->spec.channels == ioData->mNumberChannels);
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113 */
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114
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115 remaining = ioData->mDataByteSize;
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116 ptr = ioData->mData;
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117 while (remaining > 0) {
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118 if (bufferOffset >= bufferSize) {
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119 /* Generate the data */
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120 SDL_memset(buffer, this->spec.silence, bufferSize);
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121 SDL_mutexP(this->mixer_lock);
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122 (*this->spec.callback)(this->spec.userdata,
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123 buffer, bufferSize);
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124 SDL_mutexV(this->mixer_lock);
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125 bufferOffset = 0;
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126 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
127
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128 len = bufferSize - bufferOffset;
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diff changeset
129 if (len > remaining)
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diff changeset
130 len = remaining;
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131 SDL_memcpy(ptr, (char *)buffer + bufferOffset, len);
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132 ptr = (char *)ptr + len;
935
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133 remaining -= len;
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diff changeset
134 bufferOffset += len;
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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
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137 return 0;
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diff changeset
138 }
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diff changeset
139
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diff changeset
140 /* Dummy functions -- we don't use thread-based audio */
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diff changeset
141 void Core_WaitAudio(_THIS)
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diff changeset
142 {
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143 return;
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diff changeset
144 }
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parents:
diff changeset
145
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diff changeset
146 void Core_PlayAudio(_THIS)
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diff changeset
147 {
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diff changeset
148 return;
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diff changeset
149 }
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diff changeset
150
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diff changeset
151 Uint8 *Core_GetAudioBuf(_THIS)
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152 {
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153 return(NULL);
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diff changeset
154 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
155
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
156 void Core_CloseAudio(_THIS)
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diff changeset
157 {
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158 OSStatus result;
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84f930aebaeb CoreAudio driver works on Mac OSX 10.1
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diff changeset
159 struct AudioUnitInputCallback callback;
935
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diff changeset
160
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diff changeset
161 /* stop processing the audio unit */
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diff changeset
162 result = AudioOutputUnitStop (outputAudioUnit);
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diff changeset
163 if (result != noErr) {
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diff changeset
164 SDL_SetError("Core_CloseAudio: AudioOutputUnitStop");
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165 return;
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diff changeset
166 }
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parents:
diff changeset
167
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diff changeset
168 /* Remove the input callback */
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diff changeset
169 callback.inputProc = 0;
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diff changeset
170 callback.inputProcRefCon = 0;
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diff changeset
171 result = AudioUnitSetProperty (outputAudioUnit,
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diff changeset
172 kAudioUnitProperty_SetInputCallback,
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diff changeset
173 kAudioUnitScope_Input,
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
174 0,
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
175 &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
176 sizeof(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
177 if (result != noErr) {
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
178 SDL_SetError("Core_CloseAudio: AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)");
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diff changeset
179 return;
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diff changeset
180 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
181
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
182 result = CloseComponent(outputAudioUnit);
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diff changeset
183 if (result != noErr) {
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diff changeset
184 SDL_SetError("Core_CloseAudio: CloseComponent");
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diff changeset
185 return;
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parents:
diff changeset
186 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
187
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
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diff changeset
188 SDL_free(buffer);
935
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diff changeset
189 }
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diff changeset
190
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
191 #define CHECK_RESULT(msg) \
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parents:
diff changeset
192 if (result != noErr) { \
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diff changeset
193 SDL_SetError("Failed to start CoreAudio: " msg); \
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diff changeset
194 return -1; \
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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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parents:
diff changeset
196
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
197
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
198 int Core_OpenAudio(_THIS, SDL_AudioSpec *spec)
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diff changeset
199 {
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
200 OSStatus result = noErr;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
201 Component comp;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
202 ComponentDescription desc;
936
84f930aebaeb CoreAudio driver works on Mac OSX 10.1
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parents: 935
diff changeset
203 struct AudioUnitInputCallback callback;
935
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
204 AudioStreamBasicDescription requestedDesc;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
205
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
206 /* Setup a AudioStreamBasicDescription with the requested format */
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
207 requestedDesc.mFormatID = kAudioFormatLinearPCM;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
208 requestedDesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
209 requestedDesc.mChannelsPerFrame = spec->channels;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
210 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
211
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
212 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
213 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
214 requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
215 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
216 requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
217
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
218 requestedDesc.mFramesPerPacket = 1;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
219 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
220 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
221
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
222
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
223 /* 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
224 desc.componentType = kAudioUnitComponentType;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
225 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
226 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
227 desc.componentFlags = 0;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
228 desc.componentFlagsMask = 0;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
229
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
230 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
231 if (comp == NULL) {
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
232 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
233 return -1;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
234 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
235
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
236 /* 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
237 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
238 CHECK_RESULT("OpenAComponent")
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
239
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
240 result = AudioUnitInitialize (outputAudioUnit);
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
241 CHECK_RESULT("AudioUnitInitialize")
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
242
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
243 /* 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
244 result = AudioUnitSetProperty (outputAudioUnit,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
245 kAudioUnitProperty_StreamFormat,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
246 kAudioUnitScope_Input,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
247 0,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
248 &requestedDesc,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
249 sizeof (requestedDesc));
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
250 CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_StreamFormat)")
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 audio callback */
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
253 callback.inputProc = audioCallback;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
254 callback.inputProcRefCon = this;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
255 result = AudioUnitSetProperty (outputAudioUnit,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
256 kAudioUnitProperty_SetInputCallback,
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257 kAudioUnitScope_Input,
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258 0,
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259 &callback,
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260 sizeof(callback));
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261 CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)")
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262
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263 /* Calculate the final parameters for this audio specification */
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264 SDL_CalculateAudioSpec(spec);
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265
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266 /* Allocate a sample buffer */
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267 bufferOffset = bufferSize = this->spec.size;
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268 buffer = SDL_malloc(bufferSize);
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269
935
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270 /* Finally, start processing of the audio unit */
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271 result = AudioOutputUnitStart (outputAudioUnit);
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272 CHECK_RESULT("AudioOutputUnitStart")
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273
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274
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275 /* We're running! */
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276 return(1);
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277 }