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annotate src/audio/macosx/SDL_coreaudio.c @ 1361:19418e4422cb

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New configure-based build system. Still work in progress, but much improved
author Sam Lantinga <slouken@libsdl.org>
date Thu, 16 Feb 2006 10:11:48 +0000
parents c71e05b4dc2e
children d910939febfa
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
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23 #include <AudioUnit/AudioUnit.h>
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24
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25 #include "SDL_audio.h"
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26 #include "../SDL_audio_c.h"
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27 #include "../SDL_sysaudio.h"
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28 #include "SDL_coreaudio.h"
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29
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30
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31 /* Audio driver functions */
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32
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33 static int Core_OpenAudio(_THIS, SDL_AudioSpec *spec);
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34 static void Core_WaitAudio(_THIS);
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35 static void Core_PlayAudio(_THIS);
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36 static Uint8 *Core_GetAudioBuf(_THIS);
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37 static void Core_CloseAudio(_THIS);
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38
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39 /* Audio driver bootstrap functions */
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40
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41 static int Audio_Available(void)
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42 {
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43 return(1);
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44 }
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45
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46 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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47 {
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48 SDL_free(device->hidden);
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49 SDL_free(device);
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50 }
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51
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52 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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53 {
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54 SDL_AudioDevice *this;
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55
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56 /* Initialize all variables that we clean on shutdown */
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57 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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58 if ( this ) {
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59 SDL_memset(this, 0, (sizeof *this));
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60 this->hidden = (struct SDL_PrivateAudioData *)
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61 SDL_malloc((sizeof *this->hidden));
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62 }
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63 if ( (this == NULL) || (this->hidden == NULL) ) {
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64 SDL_OutOfMemory();
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65 if ( this ) {
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66 SDL_free(this);
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67 }
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68 return(0);
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69 }
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70 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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71
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72 /* Set the function pointers */
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73 this->OpenAudio = Core_OpenAudio;
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74 this->WaitAudio = Core_WaitAudio;
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75 this->PlayAudio = Core_PlayAudio;
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76 this->GetAudioBuf = Core_GetAudioBuf;
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77 this->CloseAudio = Core_CloseAudio;
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78
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79 this->free = Audio_DeleteDevice;
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80
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81 return this;
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82 }
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83
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84 AudioBootStrap COREAUDIO_bootstrap = {
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85 "coreaudio", "Mac OS X CoreAudio",
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86 Audio_Available, Audio_CreateDevice
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87 };
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88
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89 /* The CoreAudio callback */
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90 static OSStatus audioCallback (void *inRefCon,
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91 AudioUnitRenderActionFlags inActionFlags,
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92 const AudioTimeStamp *inTimeStamp,
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93 UInt32 inBusNumber,
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94 AudioBuffer *ioData)
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95 {
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96 SDL_AudioDevice *this = (SDL_AudioDevice *)inRefCon;
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97 UInt32 remaining, len;
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98 void *ptr;
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99
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100 /* Only do anything if audio is enabled and not paused */
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101 if ( ! this->enabled || this->paused ) {
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102 SDL_memset(ioData->mData, this->spec.silence, ioData->mDataByteSize);
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103 return 0;
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104 }
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105
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106 /* No SDL conversion should be needed here, ever, since we accept
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107 any input format in OpenAudio, and leave the conversion to CoreAudio.
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108 */
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109 /*
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110 assert(!this->convert.needed);
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111 assert(this->spec.channels == ioData->mNumberChannels);
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112 */
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113
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114 remaining = ioData->mDataByteSize;
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115 ptr = ioData->mData;
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116 while (remaining > 0) {
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117 if (bufferOffset >= bufferSize) {
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118 /* Generate the data */
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119 SDL_memset(buffer, this->spec.silence, bufferSize);
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120 SDL_mutexP(this->mixer_lock);
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121 (*this->spec.callback)(this->spec.userdata,
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122 buffer, bufferSize);
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123 SDL_mutexV(this->mixer_lock);
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124 bufferOffset = 0;
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125 }
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126
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diff changeset
127 len = bufferSize - bufferOffset;
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128 if (len > remaining)
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diff changeset
129 len = remaining;
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diff changeset
130 SDL_memcpy(ptr, buffer + bufferOffset, len);
935
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131 ptr += len;
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diff changeset
132 remaining -= len;
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diff changeset
133 bufferOffset += len;
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diff changeset
134 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
135
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
136 return 0;
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diff changeset
137 }
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diff changeset
138
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diff changeset
139 /* Dummy functions -- we don't use thread-based audio */
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140 void Core_WaitAudio(_THIS)
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diff changeset
141 {
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142 return;
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diff changeset
143 }
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diff changeset
144
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diff changeset
145 void Core_PlayAudio(_THIS)
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diff changeset
146 {
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diff changeset
147 return;
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diff changeset
148 }
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149
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diff changeset
150 Uint8 *Core_GetAudioBuf(_THIS)
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151 {
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diff changeset
152 return(NULL);
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diff changeset
153 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
154
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
155 void Core_CloseAudio(_THIS)
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diff changeset
156 {
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157 OSStatus result;
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diff changeset
158 struct AudioUnitInputCallback callback;
935
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diff changeset
159
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diff changeset
160 /* stop processing the audio unit */
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diff changeset
161 result = AudioOutputUnitStop (outputAudioUnit);
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diff changeset
162 if (result != noErr) {
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diff changeset
163 SDL_SetError("Core_CloseAudio: AudioOutputUnitStop");
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164 return;
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165 }
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diff changeset
166
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diff changeset
167 /* Remove the input callback */
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diff changeset
168 callback.inputProc = 0;
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diff changeset
169 callback.inputProcRefCon = 0;
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diff changeset
170 result = AudioUnitSetProperty (outputAudioUnit,
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diff changeset
171 kAudioUnitProperty_SetInputCallback,
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diff changeset
172 kAudioUnitScope_Input,
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diff changeset
173 0,
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diff changeset
174 &callback,
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Sam Lantinga <slouken@libsdl.org>
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diff changeset
175 sizeof(callback));
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
176 if (result != noErr) {
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 SDL_SetError("Core_CloseAudio: AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)");
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diff changeset
178 return;
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179 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
180
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
181 result = CloseComponent(outputAudioUnit);
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diff changeset
182 if (result != noErr) {
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diff changeset
183 SDL_SetError("Core_CloseAudio: CloseComponent");
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diff changeset
184 return;
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diff changeset
185 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
186
1336
3692456e7b0f Use SDL_ prefixed versions of C library functions.
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diff changeset
187 SDL_free(buffer);
935
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188 }
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diff changeset
189
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
190 #define CHECK_RESULT(msg) \
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diff changeset
191 if (result != noErr) { \
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diff changeset
192 SDL_SetError("Failed to start CoreAudio: " msg); \
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diff changeset
193 return -1; \
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parents:
diff changeset
194 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
195
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
196
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
197 int Core_OpenAudio(_THIS, SDL_AudioSpec *spec)
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diff changeset
198 {
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diff changeset
199 OSStatus result = noErr;
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diff changeset
200 Component comp;
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diff changeset
201 ComponentDescription desc;
936
84f930aebaeb CoreAudio driver works on Mac OSX 10.1
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diff changeset
202 struct AudioUnitInputCallback callback;
935
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
203 AudioStreamBasicDescription requestedDesc;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
204
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
205 /* Setup a AudioStreamBasicDescription with the requested format */
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parents:
diff changeset
206 requestedDesc.mFormatID = kAudioFormatLinearPCM;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
207 requestedDesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
208 requestedDesc.mChannelsPerFrame = spec->channels;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
209 requestedDesc.mSampleRate = spec->freq;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
210
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
211 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
212 if (spec->format & 0x8000)
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
213 requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
214 if (spec->format & 0x1000)
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
215 requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
216
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
217 requestedDesc.mFramesPerPacket = 1;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
218 requestedDesc.mBytesPerFrame = requestedDesc.mBitsPerChannel * requestedDesc.mChannelsPerFrame / 8;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
219 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
220
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 /* 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
223 desc.componentType = kAudioUnitComponentType;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
224 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
225 desc.componentManufacturer = kAudioUnitID_DefaultOutput;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
226 desc.componentFlags = 0;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
227 desc.componentFlagsMask = 0;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
228
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
229 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
230 if (comp == NULL) {
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
231 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
232 return -1;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
233 }
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 /* 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
236 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
237 CHECK_RESULT("OpenAComponent")
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 result = AudioUnitInitialize (outputAudioUnit);
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
240 CHECK_RESULT("AudioUnitInitialize")
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
241
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
242 /* 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
243 result = AudioUnitSetProperty (outputAudioUnit,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
244 kAudioUnitProperty_StreamFormat,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
245 kAudioUnitScope_Input,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
246 0,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
247 &requestedDesc,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
248 sizeof (requestedDesc));
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
249 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
250
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
251 /* 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
252 callback.inputProc = audioCallback;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
253 callback.inputProcRefCon = this;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
254 result = AudioUnitSetProperty (outputAudioUnit,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
255 kAudioUnitProperty_SetInputCallback,
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
256 kAudioUnitScope_Input,
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257 0,
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258 &callback,
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259 sizeof(callback));
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260 CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)")
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261
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262 /* Calculate the final parameters for this audio specification */
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263 SDL_CalculateAudioSpec(spec);
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264
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265 /* Allocate a sample buffer */
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266 bufferOffset = bufferSize = this->spec.size;
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267 buffer = SDL_malloc(bufferSize);
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268
935
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269 /* Finally, start processing of the audio unit */
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270 result = AudioOutputUnitStart (outputAudioUnit);
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271 CHECK_RESULT("AudioOutputUnitStart")
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272
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273
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274 /* We're running! */
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275 return(1);
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276 }