Mercurial > sdl-ios-xcode

annotate src/audio/macosx/SDL_coreaudio.c @ 4142:4433ef2a1802 SDL-1.2

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We probably want to still do this for fullscreen surfaces, since we may be clearing the edges of a centered video mode or garbage left over from a mode switch.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 29 Feb 2008 14:01:45 +0000
parents 9df8136abec0
children a1b03ba2fcd0
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 #ifdef AVAILABLE_MAC_OS_X_VERSION_10_5_AND_LATER
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26 #include <AudioUnit/AUNTComponent.h>
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27 #endif
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28
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29 #include "SDL_audio.h"
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30 #include "../SDL_audio_c.h"
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31 #include "../SDL_sysaudio.h"
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32 #include "SDL_coreaudio.h"
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33
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34
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35 /* Audio driver functions */
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36
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37 static int Core_OpenAudio(_THIS, SDL_AudioSpec *spec);
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38 static void Core_WaitAudio(_THIS);
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39 static void Core_PlayAudio(_THIS);
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40 static Uint8 *Core_GetAudioBuf(_THIS);
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41 static void Core_CloseAudio(_THIS);
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42
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43 /* Audio driver bootstrap functions */
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44
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45 static int Audio_Available(void)
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46 {
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47 return(1);
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48 }
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49
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50 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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51 {
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52 SDL_free(device->hidden);
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53 SDL_free(device);
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54 }
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55
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56 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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57 {
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58 SDL_AudioDevice *this;
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59
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60 /* Initialize all variables that we clean on shutdown */
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61 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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62 if ( this ) {
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63 SDL_memset(this, 0, (sizeof *this));
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64 this->hidden = (struct SDL_PrivateAudioData *)
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65 SDL_malloc((sizeof *this->hidden));
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66 }
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67 if ( (this == NULL) || (this->hidden == NULL) ) {
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68 SDL_OutOfMemory();
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69 if ( this ) {
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70 SDL_free(this);
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71 }
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72 return(0);
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73 }
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74 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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75
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76 /* Set the function pointers */
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77 this->OpenAudio = Core_OpenAudio;
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78 this->WaitAudio = Core_WaitAudio;
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79 this->PlayAudio = Core_PlayAudio;
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80 this->GetAudioBuf = Core_GetAudioBuf;
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81 this->CloseAudio = Core_CloseAudio;
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82
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83 this->free = Audio_DeleteDevice;
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84
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85 return this;
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86 }
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87
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88 AudioBootStrap COREAUDIO_bootstrap = {
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89 "coreaudio", "Mac OS X CoreAudio",
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90 Audio_Available, Audio_CreateDevice
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91 };
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92
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93 /* The CoreAudio callback */
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94 static OSStatus audioCallback (void *inRefCon,
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95 AudioUnitRenderActionFlags inActionFlags,
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96 const AudioTimeStamp *inTimeStamp,
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97 UInt32 inBusNumber,
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98 AudioBuffer *ioData)
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99 {
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100 SDL_AudioDevice *this = (SDL_AudioDevice *)inRefCon;
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101 UInt32 remaining, len;
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102 void *ptr;
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103
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104 /* Only do anything if audio is enabled and not paused */
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105 if ( ! this->enabled || this->paused ) {
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106 SDL_memset(ioData->mData, this->spec.silence, ioData->mDataByteSize);
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107 return 0;
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108 }
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109
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110 /* No SDL conversion should be needed here, ever, since we accept
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111 any input format in OpenAudio, and leave the conversion to CoreAudio.
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112 */
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113 /*
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114 assert(!this->convert.needed);
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115 assert(this->spec.channels == ioData->mNumberChannels);
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116 */
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117
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118 remaining = ioData->mDataByteSize;
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119 ptr = ioData->mData;
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120 while (remaining > 0) {
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121 if (bufferOffset >= bufferSize) {
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122 /* Generate the data */
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123 SDL_memset(buffer, this->spec.silence, bufferSize);
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124 SDL_mutexP(this->mixer_lock);
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125 (*this->spec.callback)(this->spec.userdata,
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diff changeset
126 buffer, bufferSize);
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127 SDL_mutexV(this->mixer_lock);
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diff changeset
128 bufferOffset = 0;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
129 }
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diff changeset
130
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
131 len = bufferSize - bufferOffset;
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diff changeset
132 if (len > remaining)
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
133 len = remaining;
1487
dc6b59e925a2 Cleaning up warnings on MacOS X
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134 SDL_memcpy(ptr, (char *)buffer + bufferOffset, len);
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135 ptr = (char *)ptr + len;
935
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diff changeset
136 remaining -= len;
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diff changeset
137 bufferOffset += len;
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diff changeset
138 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
139
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140 return 0;
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diff changeset
141 }
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diff changeset
142
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diff changeset
143 /* Dummy functions -- we don't use thread-based audio */
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144 void Core_WaitAudio(_THIS)
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diff changeset
145 {
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diff changeset
146 return;
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diff changeset
147 }
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diff changeset
148
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diff changeset
149 void Core_PlayAudio(_THIS)
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diff changeset
150 {
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
151 return;
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diff changeset
152 }
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diff changeset
153
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diff changeset
154 Uint8 *Core_GetAudioBuf(_THIS)
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155 {
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156 return(NULL);
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157 }
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diff changeset
158
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diff changeset
159 void Core_CloseAudio(_THIS)
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diff changeset
160 {
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diff changeset
161 OSStatus result;
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84f930aebaeb CoreAudio driver works on Mac OSX 10.1
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diff changeset
162 struct AudioUnitInputCallback callback;
935
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163
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164 /* stop processing the audio unit */
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diff changeset
165 result = AudioOutputUnitStop (outputAudioUnit);
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166 if (result != noErr) {
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diff changeset
167 SDL_SetError("Core_CloseAudio: AudioOutputUnitStop");
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diff changeset
168 return;
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169 }
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diff changeset
170
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171 /* Remove the input callback */
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diff changeset
172 callback.inputProc = 0;
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diff changeset
173 callback.inputProcRefCon = 0;
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diff changeset
174 result = AudioUnitSetProperty (outputAudioUnit,
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diff changeset
175 kAudioUnitProperty_SetInputCallback,
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diff changeset
176 kAudioUnitScope_Input,
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diff changeset
177 0,
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178 &callback,
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diff changeset
179 sizeof(callback));
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diff changeset
180 if (result != noErr) {
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
181 SDL_SetError("Core_CloseAudio: AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)");
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diff changeset
182 return;
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183 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
184
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
185 result = CloseComponent(outputAudioUnit);
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diff changeset
186 if (result != noErr) {
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diff changeset
187 SDL_SetError("Core_CloseAudio: CloseComponent");
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diff changeset
188 return;
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189 }
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diff changeset
190
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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diff changeset
191 SDL_free(buffer);
935
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192 }
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diff changeset
193
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
194 #define CHECK_RESULT(msg) \
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diff changeset
195 if (result != noErr) { \
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diff changeset
196 SDL_SetError("Failed to start CoreAudio: " msg); \
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197 return -1; \
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diff changeset
198 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
199
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
200
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
201 int Core_OpenAudio(_THIS, SDL_AudioSpec *spec)
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diff changeset
202 {
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
203 OSStatus result = noErr;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
204 Component comp;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
205 ComponentDescription desc;
936
84f930aebaeb CoreAudio driver works on Mac OSX 10.1
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parents: 935
diff changeset
206 struct AudioUnitInputCallback callback;
935
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
207 AudioStreamBasicDescription requestedDesc;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
208
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
209 /* 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
210 requestedDesc.mFormatID = kAudioFormatLinearPCM;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
211 requestedDesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
212 requestedDesc.mChannelsPerFrame = spec->channels;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
213 requestedDesc.mSampleRate = spec->freq;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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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 requestedDesc.mBitsPerChannel = spec->format & 0xFF;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
216 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
217 requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
218 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
219 requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
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
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parents:
diff changeset
221 requestedDesc.mFramesPerPacket = 1;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
222 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
223 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
224
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
225
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
226 /* 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
227 desc.componentType = kAudioUnitComponentType;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
228 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
229 desc.componentManufacturer = kAudioUnitID_DefaultOutput;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
230 desc.componentFlags = 0;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
231 desc.componentFlagsMask = 0;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
232
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
233 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
234 if (comp == NULL) {
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
235 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
236 return -1;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
237 }
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 /* 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
240 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
241 CHECK_RESULT("OpenAComponent")
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 result = AudioUnitInitialize (outputAudioUnit);
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
244 CHECK_RESULT("AudioUnitInitialize")
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
245
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
246 /* 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
247 result = AudioUnitSetProperty (outputAudioUnit,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
248 kAudioUnitProperty_StreamFormat,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
249 kAudioUnitScope_Input,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
250 0,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
251 &requestedDesc,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
252 sizeof (requestedDesc));
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
253 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
254
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
255 /* Set the audio callback */
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
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256 callback.inputProc = audioCallback;
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257 callback.inputProcRefCon = this;
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258 result = AudioUnitSetProperty (outputAudioUnit,
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259 kAudioUnitProperty_SetInputCallback,
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260 kAudioUnitScope_Input,
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261 0,
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262 &callback,
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263 sizeof(callback));
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264 CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)")
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265
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266 /* Calculate the final parameters for this audio specification */
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267 SDL_CalculateAudioSpec(spec);
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268
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269 /* Allocate a sample buffer */
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270 bufferOffset = bufferSize = this->spec.size;
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271 buffer = SDL_malloc(bufferSize);
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272
935
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273 /* Finally, start processing of the audio unit */
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274 result = AudioOutputUnitStart (outputAudioUnit);
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275 CHECK_RESULT("AudioOutputUnitStart")
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276
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277
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278 /* We're running! */
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279 return(1);
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280 }