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annotate src/audio/macosx/SDL_coreaudio.c @ 1687:d36048e8e302 SDL-1.3

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author Sam Lantinga <slouken@libsdl.org>
date Sun, 18 Jun 2006 13:54:27 +0000
parents 4da1ee79c9af
children
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
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43 Audio_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 void
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49 Audio_DeleteDevice(SDL_AudioDevice * device)
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50 {
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51 SDL_free(device->hidden);
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52 SDL_free(device);
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53 }
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54
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55 static SDL_AudioDevice *
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56 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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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
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95 audioCallback(void *inRefCon,
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96 AudioUnitRenderActionFlags inActionFlags,
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97 const AudioTimeStamp * inTimeStamp,
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98 UInt32 inBusNumber, 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, buffer, bufferSize);
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126 SDL_mutexV(this->mixer_lock);
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127 bufferOffset = 0;
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128 }
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129
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130 len = bufferSize - bufferOffset;
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131 if (len > remaining)
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132 len = remaining;
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133 SDL_memcpy(ptr, (char *) buffer + bufferOffset, len);
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134 ptr = (char *) ptr + len;
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135 remaining -= len;
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136 bufferOffset += len;
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137 }
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138
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139 return 0;
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140 }
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141
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142 /* Dummy functions -- we don't use thread-based audio */
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143 void
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144 Core_WaitAudio(_THIS)
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145 {
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146 return;
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147 }
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148
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149 void
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150 Core_PlayAudio(_THIS)
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151 {
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152 return;
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153 }
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154
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155 Uint8 *
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156 Core_GetAudioBuf(_THIS)
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157 {
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158 return (NULL);
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159 }
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160
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161 void
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162 Core_CloseAudio(_THIS)
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163 {
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164 OSStatus result;
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165 struct AudioUnitInputCallback callback;
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166
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167 /* stop processing the audio unit */
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168 result = AudioOutputUnitStop(outputAudioUnit);
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169 if (result != noErr) {
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170 SDL_SetError("Core_CloseAudio: AudioOutputUnitStop");
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171 return;
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172 }
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173
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174 /* Remove the input callback */
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175 callback.inputProc = 0;
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176 callback.inputProcRefCon = 0;
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177 result = AudioUnitSetProperty(outputAudioUnit,
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178 kAudioUnitProperty_SetInputCallback,
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179 kAudioUnitScope_Input,
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180 0, &callback, sizeof(callback));
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181 if (result != noErr) {
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182 SDL_SetError
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183 ("Core_CloseAudio: AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)");
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184 return;
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185 }
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186
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187 result = CloseComponent(outputAudioUnit);
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188 if (result != noErr) {
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189 SDL_SetError("Core_CloseAudio: CloseComponent");
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190 return;
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191 }
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192
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193 SDL_free(buffer);
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194 }
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195
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196 #define CHECK_RESULT(msg) \
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197 if (result != noErr) { \
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198 SDL_SetError("Failed to start CoreAudio: " msg); \
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199 return -1; \
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200 }
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201
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202
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203 int
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204 Core_OpenAudio(_THIS, SDL_AudioSpec * spec)
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205 {
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206 OSStatus result = noErr;
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207 Component comp;
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208 ComponentDescription desc;
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209 struct AudioUnitInputCallback callback;
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210 AudioStreamBasicDescription requestedDesc;
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211
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212 /* Setup a AudioStreamBasicDescription with the requested format */
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213 requestedDesc.mFormatID = kAudioFormatLinearPCM;
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214 requestedDesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
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215 requestedDesc.mChannelsPerFrame = spec->channels;
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216 requestedDesc.mSampleRate = spec->freq;
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217
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218 requestedDesc.mBitsPerChannel = spec->format & 0xFF;
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219 if (spec->format & 0x8000)
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220 requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
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221 if (spec->format & 0x1000)
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222 requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
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223
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224 requestedDesc.mFramesPerPacket = 1;
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225 requestedDesc.mBytesPerFrame =
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226 requestedDesc.mBitsPerChannel * requestedDesc.mChannelsPerFrame / 8;
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227 requestedDesc.mBytesPerPacket =
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228 requestedDesc.mBytesPerFrame * requestedDesc.mFramesPerPacket;
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229
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230
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231 /* Locate the default output audio unit */
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232 desc.componentType = kAudioUnitComponentType;
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233 desc.componentSubType = kAudioUnitSubType_Output;
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234 desc.componentManufacturer = kAudioUnitID_DefaultOutput;
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235 desc.componentFlags = 0;
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236 desc.componentFlagsMask = 0;
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237
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238 comp = FindNextComponent(NULL, &desc);
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239 if (comp == NULL) {
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240 SDL_SetError
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241 ("Failed to start CoreAudio: FindNextComponent returned NULL");
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242 return -1;
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243 }
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244
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245 /* Open & initialize the default output audio unit */
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246 result = OpenAComponent(comp, &outputAudioUnit);
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247 CHECK_RESULT("OpenAComponent")
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248 result = AudioUnitInitialize(outputAudioUnit);
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249 CHECK_RESULT("AudioUnitInitialize")
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250 /* Set the input format of the audio unit. */
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251 result = AudioUnitSetProperty(outputAudioUnit,
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252 kAudioUnitProperty_StreamFormat,
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253 kAudioUnitScope_Input,
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254 0,
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255 &requestedDesc, sizeof(requestedDesc));
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256 CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_StreamFormat)")
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257 /* Set the audio callback */
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258 callback.inputProc = audioCallback;
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259 callback.inputProcRefCon = this;
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260 result = AudioUnitSetProperty(outputAudioUnit,
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261 kAudioUnitProperty_SetInputCallback,
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262 kAudioUnitScope_Input,
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263 0, &callback, sizeof(callback));
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264 CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)")
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265 /* Calculate the final parameters for this audio specification */
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266 SDL_CalculateAudioSpec(spec);
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267
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268 /* Allocate a sample buffer */
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269 bufferOffset = bufferSize = this->spec.size;
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270 buffer = SDL_malloc(bufferSize);
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271
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272 /* Finally, start processing of the audio unit */
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273 result = AudioOutputUnitStart(outputAudioUnit);
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274 CHECK_RESULT("AudioOutputUnitStart")
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275 /* We're running! */
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276 return (1);
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277 }
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278
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279 /* vi: set ts=4 sw=4 expandtab: */