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annotate src/audio/macosx/SDL_coreaudio.c @ 3784:37c9c4590689 SDL-ryan-multiple-audio-device

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First batch of heavy lifting on supporting multiple audio devices at once. This has a long way to go yet, most of the drivers aren't updated for the new interfaces, and it's still got some obvious bugs, FIXMEs, and wistlist items. Don't use yet.
author Ryan C. Gordon <icculus@icculus.org>
date Sun, 01 Oct 2006 05:24:03 +0000
parents adf732f1f016
children da2ea0694d11
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 COREAUDIO_OpenAudio(_THIS, const char *devname, int iscapture);
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35 static void COREAUDIO_WaitAudio(_THIS);
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36 static void COREAUDIO_PlayAudio(_THIS);
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37 static Uint8 *COREAUDIO_GetAudioBuf(_THIS);
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38 static void COREAUDIO_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
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43 COREAUDIO_Available(void)
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44 {
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45 return (1);
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46 }
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47
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48 static int
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49 COREAUDIO_Init(SDL_AudioDriverImpl *impl)
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50 {
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51 /* Set the function pointers */
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52 impl->OpenAudio = COREAUDIO_OpenAudio;
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53 impl->WaitAudio = COREAUDIO_WaitAudio;
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54 impl->PlayAudio = COREAUDIO_PlayAudio;
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55 impl->GetAudioBuf = COREAUDIO_GetAudioBuf;
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56 impl->CloseAudio = COREAUDIO_CloseAudio;
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57
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58 return 1;
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59 }
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60
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61 AudioBootStrap COREAUDIO_bootstrap = {
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62 "coreaudio", "Mac OS X CoreAudio",
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63 COREAUDIO_Available, COREAUDIO_Init
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64 };
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65
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66 /* The CoreAudio callback */
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67 static OSStatus
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68 audioCallback(void *inRefCon,
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69 AudioUnitRenderActionFlags inActionFlags,
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70 const AudioTimeStamp * inTimeStamp,
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71 UInt32 inBusNumber, AudioBuffer * ioData)
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72 {
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73 SDL_AudioDevice *this = (SDL_AudioDevice *) inRefCon;
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74 UInt32 remaining, len;
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75 void *ptr;
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76
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77 /* Only do anything if audio is enabled and not paused */
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78 if (!this->enabled || this->paused) {
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79 SDL_memset(ioData->mData, this->spec.silence, ioData->mDataByteSize);
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80 return 0;
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81 }
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82
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83 /* No SDL conversion should be needed here, ever, since we accept
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84 any input format in OpenAudio, and leave the conversion to CoreAudio.
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85 */
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86 /*
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87 assert(!this->convert.needed);
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88 assert(this->spec.channels == ioData->mNumberChannels);
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89 */
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90
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91 remaining = ioData->mDataByteSize;
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92 ptr = ioData->mData;
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93 while (remaining > 0) {
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94 if (this->hidden->bufferOffset >= this->hidden->bufferSize) {
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95 /* Generate the data */
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96 SDL_memset(this->hidden->buffer, this->spec.silence,
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97 this->hidden->bufferSize);
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98 SDL_mutexP(this->mixer_lock);
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99 (*this->spec.callback) (this->spec.userdata, this->hidden->buffer,
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100 this->hidden->bufferSize);
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101 SDL_mutexV(this->mixer_lock);
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102 this->hidden->bufferOffset = 0;
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103 }
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104
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105 len = this->hidden->bufferSize - this->hidden->bufferOffset;
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106 if (len > remaining)
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107 len = remaining;
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108 SDL_memcpy(ptr,
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109 (char *) this->hidden->buffer + this->hidden->bufferOffset,
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110 len);
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111 ptr = (char *) ptr + len;
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112 remaining -= len;
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113 this->hidden->bufferOffset += len;
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114 }
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115
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116 return 0;
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117 }
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118
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119 /* Dummy functions -- we don't use thread-based audio */
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120 void
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121 COREAUDIO_WaitAudio(_THIS)
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122 {
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123 return;
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124 }
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diff changeset
125
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diff changeset
126 void
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127 COREAUDIO_PlayAudio(_THIS)
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128 {
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129 return;
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130 }
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131
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132 Uint8 *
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133 COREAUDIO_GetAudioBuf(_THIS)
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134 {
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135 return (NULL);
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136 }
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diff changeset
137
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diff changeset
138 void
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139 COREAUDIO_CloseAudio(_THIS)
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140 {
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141 OSStatus result;
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142 struct AudioUnitInputCallback callback;
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143
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144 if (this->hidden == NULL) {
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145 return;
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146 }
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147
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148 /* stop processing the audio unit */
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149 result = AudioOutputUnitStop(this->hidden->outputAudioUnit);
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150 if (result != noErr) {
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151 SDL_SetError("COREAUDIO_CloseAudio: AudioOutputUnitStop");
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152 return;
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153 }
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154
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155 /* Remove the input callback */
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156 callback.inputProc = 0;
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157 callback.inputProcRefCon = 0;
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158 result = AudioUnitSetProperty(this->hidden->outputAudioUnit,
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159 kAudioUnitProperty_SetInputCallback,
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160 kAudioUnitScope_Input,
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161 0, &callback, sizeof(callback));
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162 if (result != noErr) {
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163 SDL_SetError
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164 ("COREAUDIO_CloseAudio: AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)");
935
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165 return;
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166 }
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167
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168 result = CloseComponent(this->hidden->outputAudioUnit);
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169 if (result != noErr) {
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170 SDL_SetError("COREAUDIO_CloseAudio: CloseComponent");
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171 return;
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parents:
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172 }
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173
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174 SDL_free(this->hidden->buffer);
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175 SDL_free(this->hidden);
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176 this->hidden = NULL;
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177 }
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178
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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179 #define CHECK_RESULT(msg) \
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180 if (result != noErr) { \
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181 COREAUDIO_CloseAudio(this); \
2017
df06e6eb65c6 Fixed macosx audio initialization (passed wrong struct to CoreAudio).
Ryan C. Gordon <icculus@icculus.org>
parents: 2016
diff changeset
182 SDL_SetError("CoreAudio error (%s): %d", msg, (int) result); \
935
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183 return -1; \
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diff changeset
184 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
185
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
186
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187 int
3784
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188 COREAUDIO_OpenAudio(_THIS, const char *devname, int iscapture)
935
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189 {
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parents:
diff changeset
190 OSStatus result = noErr;
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parents:
diff changeset
191 Component comp;
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parents:
diff changeset
192 ComponentDescription desc;
936
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diff changeset
193 struct AudioUnitInputCallback callback;
2016
72fa74928062 Compile fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 2003
diff changeset
194 AudioStreamBasicDescription strdesc;
3784
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diff changeset
195 SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
2003
506851d3efa4 Mac OS X audio backend now supports int32/float32.
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diff changeset
196 int valid_datatype = 0;
935
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diff changeset
197
3784
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diff changeset
198 /* Initialize all variables that we clean on shutdown */
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diff changeset
199 this->hidden = (struct SDL_PrivateAudioData *)
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diff changeset
200 SDL_malloc((sizeof *this->hidden));
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diff changeset
201 if (this->hidden == NULL) {
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once.
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diff changeset
202 SDL_OutOfMemory();
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diff changeset
203 return (0);
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once.
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diff changeset
204 }
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once.
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diff changeset
205 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once.
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parents: 2043
diff changeset
206
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once.
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diff changeset
207 /* !!! FIXME: check devname and iscapture... */
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diff changeset
208
935
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diff changeset
209 /* Setup a AudioStreamBasicDescription with the requested format */
2043
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parents: 2017
diff changeset
210 memset(&strdesc, '\0', sizeof(AudioStreamBasicDescription));
2016
72fa74928062 Compile fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 2003
diff changeset
211 strdesc.mFormatID = kAudioFormatLinearPCM;
72fa74928062 Compile fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 2003
diff changeset
212 strdesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
3784
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diff changeset
213 strdesc.mChannelsPerFrame = this->spec.channels;
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diff changeset
214 strdesc.mSampleRate = this->spec.freq;
2016
72fa74928062 Compile fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 2003
diff changeset
215 strdesc.mFramesPerPacket = 1;
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1487
diff changeset
216
2003
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
217 while ((!valid_datatype) && (test_format)) {
3784
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diff changeset
218 this->spec.format = test_format;
2003
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
219 /* Just a list of valid SDL formats, so people don't pass junk here. */
506851d3efa4 Mac OS X audio backend now supports int32/float32.
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diff changeset
220 switch (test_format) {
2043
adf732f1f016 Formatting update
Sam Lantinga <slouken@libsdl.org>
parents: 2017
diff changeset
221 case AUDIO_U8:
adf732f1f016 Formatting update
Sam Lantinga <slouken@libsdl.org>
parents: 2017
diff changeset
222 case AUDIO_S8:
adf732f1f016 Formatting update
Sam Lantinga <slouken@libsdl.org>
parents: 2017
diff changeset
223 case AUDIO_U16LSB:
adf732f1f016 Formatting update
Sam Lantinga <slouken@libsdl.org>
parents: 2017
diff changeset
224 case AUDIO_S16LSB:
adf732f1f016 Formatting update
Sam Lantinga <slouken@libsdl.org>
parents: 2017
diff changeset
225 case AUDIO_U16MSB:
adf732f1f016 Formatting update
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parents: 2017
diff changeset
226 case AUDIO_S16MSB:
adf732f1f016 Formatting update
Sam Lantinga <slouken@libsdl.org>
parents: 2017
diff changeset
227 case AUDIO_S32LSB:
adf732f1f016 Formatting update
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parents: 2017
diff changeset
228 case AUDIO_S32MSB:
adf732f1f016 Formatting update
Sam Lantinga <slouken@libsdl.org>
parents: 2017
diff changeset
229 case AUDIO_F32LSB:
adf732f1f016 Formatting update
Sam Lantinga <slouken@libsdl.org>
parents: 2017
diff changeset
230 case AUDIO_F32MSB:
adf732f1f016 Formatting update
Sam Lantinga <slouken@libsdl.org>
parents: 2017
diff changeset
231 valid_datatype = 1;
3784
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diff changeset
232 strdesc.mBitsPerChannel = SDL_AUDIO_BITSIZE(this->spec.format);
37c9c4590689 First batch of heavy lifting on supporting multiple audio devices at once.
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diff changeset
233 if (SDL_AUDIO_ISBIGENDIAN(this->spec.format))
2043
adf732f1f016 Formatting update
Sam Lantinga <slouken@libsdl.org>
parents: 2017
diff changeset
234 strdesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
935
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
235
3784
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diff changeset
236 if (SDL_AUDIO_ISFLOAT(this->spec.format))
2043
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parents: 2017
diff changeset
237 strdesc.mFormatFlags |= kLinearPCMFormatFlagIsFloat;
3784
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diff changeset
238 else if (SDL_AUDIO_ISSIGNED(this->spec.format))
2043
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Sam Lantinga <slouken@libsdl.org>
parents: 2017
diff changeset
239 strdesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
adf732f1f016 Formatting update
Sam Lantinga <slouken@libsdl.org>
parents: 2017
diff changeset
240 break;
2003
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
241 }
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
242 }
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
243
2043
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parents: 2017
diff changeset
244 if (!valid_datatype) { /* shouldn't happen, but just in case... */
2003
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
245 SDL_SetError("Unsupported audio format");
3784
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diff changeset
246 return 0;
2003
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
247 }
506851d3efa4 Mac OS X audio backend now supports int32/float32.
Ryan C. Gordon <icculus@icculus.org>
parents: 1895
diff changeset
248
2016
72fa74928062 Compile fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 2003
diff changeset
249 strdesc.mBytesPerFrame =
72fa74928062 Compile fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 2003
diff changeset
250 strdesc.mBitsPerChannel * strdesc.mChannelsPerFrame / 8;
72fa74928062 Compile fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 2003
diff changeset
251 strdesc.mBytesPerPacket =
72fa74928062 Compile fixes.
Ryan C. Gordon <icculus@icculus.org>
parents: 2003
diff changeset
252 strdesc.mBytesPerFrame * strdesc.mFramesPerPacket;
935
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parents:
diff changeset
253
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
254 /* Locate the default output audio unit */
2043
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Sam Lantinga <slouken@libsdl.org>
parents: 2017
diff changeset
255 memset(&desc, '\0', sizeof(ComponentDescription));
935
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Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
256 desc.componentType = kAudioUnitComponentType;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
257 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
258 desc.componentManufacturer = kAudioUnitID_DefaultOutput;
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259 desc.componentFlags = 0;
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260 desc.componentFlagsMask = 0;
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261
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262 comp = FindNextComponent(NULL, &desc);
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263 if (comp == NULL) {
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264 COREAUDIO_CloseAudio(this);
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265 SDL_SetError
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266 ("Failed to start CoreAudio: FindNextComponent returned NULL");
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267 return 0;
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268 }
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269
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270 /* Open & initialize the default output audio unit */
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271 result = OpenAComponent(comp, &this->hidden->outputAudioUnit);
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272 CHECK_RESULT("OpenAComponent")
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273 result = AudioUnitInitialize(this->hidden->outputAudioUnit);
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274 CHECK_RESULT("AudioUnitInitialize")
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275 /* Set the input format of the audio unit. */
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276 result = AudioUnitSetProperty(this->hidden->outputAudioUnit,
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277 kAudioUnitProperty_StreamFormat,
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278 kAudioUnitScope_Input,
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279 0, &strdesc, sizeof(strdesc));
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280 CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_StreamFormat)")
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281 /* Set the audio callback */
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282 callback.inputProc = audioCallback;
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283 callback.inputProcRefCon = this;
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284 result = AudioUnitSetProperty(this->hidden->outputAudioUnit,
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285 kAudioUnitProperty_SetInputCallback,
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286 kAudioUnitScope_Input,
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287 0, &callback, sizeof(callback));
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288 CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)")
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289 /* Calculate the final parameters for this audio specification */
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290 SDL_CalculateAudioSpec(&this->spec);
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291
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292 /* Allocate a sample buffer */
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293 this->hidden->bufferOffset = this->hidden->bufferSize = this->spec.size;
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294 this->hidden->buffer = SDL_malloc(this->hidden->bufferSize);
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295
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296 /* Finally, start processing of the audio unit */
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297 result = AudioOutputUnitStart(this->hidden->outputAudioUnit);
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298 CHECK_RESULT("AudioOutputUnitStart")
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299 /* We're running! */
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300 return (1);
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301 }
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302
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303 /* vi: set ts=4 sw=4 expandtab: */