Mercurial > sdl-ios-xcode

annotate src/audio/macosx/SDL_coreaudio.c @ 4333:55717a755897 SDL-1.2

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Switched from setting the period size and count to setting the buffer size directly, based on feedback from the ALSA development list: http://mailman.alsa-project.org/pipermail/alsa-devel/2009-October/022267.html This has the nice side effect of reducing latency on my SBLive! card.
author Sam Lantinga <slouken@libsdl.org>
date Tue, 13 Oct 2009 09:56:15 +0000
parents 95213cf5efcc
children
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 <CoreAudio/CoreAudio.h>
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25 #include <CoreServices/CoreServices.h>
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26 #include <AudioUnit/AudioUnit.h>
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27 #if MAC_OS_X_VERSION_MAX_ALLOWED <= 1050
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28 #include <AudioUnit/AUNTComponent.h>
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29 #endif
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30
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31 #include "SDL_audio.h"
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32 #include "../SDL_audio_c.h"
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33 #include "../SDL_sysaudio.h"
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34 #include "SDL_coreaudio.h"
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35
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36
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37 /* Audio driver functions */
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38
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39 static int Core_OpenAudio(_THIS, SDL_AudioSpec *spec);
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40 static void Core_WaitAudio(_THIS);
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41 static void Core_PlayAudio(_THIS);
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42 static Uint8 *Core_GetAudioBuf(_THIS);
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43 static void Core_CloseAudio(_THIS);
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44
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45 /* Audio driver bootstrap functions */
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46
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47 static int Audio_Available(void)
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48 {
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49 return(1);
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50 }
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51
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52 static void Audio_DeleteDevice(SDL_AudioDevice *device)
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53 {
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54 SDL_free(device->hidden);
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55 SDL_free(device);
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56 }
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57
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58 static SDL_AudioDevice *Audio_CreateDevice(int devindex)
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59 {
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60 SDL_AudioDevice *this;
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61
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62 /* Initialize all variables that we clean on shutdown */
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63 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice));
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64 if ( this ) {
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65 SDL_memset(this, 0, (sizeof *this));
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66 this->hidden = (struct SDL_PrivateAudioData *)
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67 SDL_malloc((sizeof *this->hidden));
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68 }
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69 if ( (this == NULL) || (this->hidden == NULL) ) {
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70 SDL_OutOfMemory();
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71 if ( this ) {
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72 SDL_free(this);
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73 }
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74 return(0);
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75 }
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76 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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77
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78 /* Set the function pointers */
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79 this->OpenAudio = Core_OpenAudio;
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80 this->WaitAudio = Core_WaitAudio;
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81 this->PlayAudio = Core_PlayAudio;
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82 this->GetAudioBuf = Core_GetAudioBuf;
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83 this->CloseAudio = Core_CloseAudio;
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84
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85 this->free = Audio_DeleteDevice;
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86
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87 return this;
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88 }
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89
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90 AudioBootStrap COREAUDIO_bootstrap = {
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91 "coreaudio", "Mac OS X CoreAudio",
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92 Audio_Available, Audio_CreateDevice
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93 };
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94
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95 /* The CoreAudio callback */
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96 static OSStatus audioCallback (void *inRefCon,
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97 AudioUnitRenderActionFlags *ioActionFlags,
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98 const AudioTimeStamp *inTimeStamp,
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99 UInt32 inBusNumber,
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100 UInt32 inNumberFrames,
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101 AudioBufferList *ioData)
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102 {
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103 SDL_AudioDevice *this = (SDL_AudioDevice *)inRefCon;
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104 UInt32 remaining, len;
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105 AudioBuffer *abuf;
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106 void *ptr;
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107 UInt32 i;
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108
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109 /* Only do anything if audio is enabled and not paused */
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110 if ( ! this->enabled || this->paused ) {
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111 for (i = 0; i < ioData->mNumberBuffers; i++) {
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112 abuf = &ioData->mBuffers[i];
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113 SDL_memset(abuf->mData, this->spec.silence, abuf->mDataByteSize);
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114 }
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115 return 0;
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116 }
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117
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118 /* No SDL conversion should be needed here, ever, since we accept
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119 any input format in OpenAudio, and leave the conversion to CoreAudio.
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120 */
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121 /*
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122 assert(!this->convert.needed);
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123 assert(this->spec.channels == ioData->mNumberChannels);
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124 */
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125
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126 for (i = 0; i < ioData->mNumberBuffers; i++) {
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127 abuf = &ioData->mBuffers[i];
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128 remaining = abuf->mDataByteSize;
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129 ptr = abuf->mData;
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130 while (remaining > 0) {
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131 if (bufferOffset >= bufferSize) {
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132 /* Generate the data */
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133 SDL_memset(buffer, this->spec.silence, bufferSize);
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134 SDL_mutexP(this->mixer_lock);
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135 (*this->spec.callback)(this->spec.userdata,
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136 buffer, bufferSize);
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137 SDL_mutexV(this->mixer_lock);
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138 bufferOffset = 0;
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139 }
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140
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141 len = bufferSize - bufferOffset;
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142 if (len > remaining)
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143 len = remaining;
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144 SDL_memcpy(ptr, (char *)buffer + bufferOffset, len);
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145 ptr = (char *)ptr + len;
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146 remaining -= len;
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147 bufferOffset += len;
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148 }
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149 }
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150
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151 return 0;
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152 }
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153
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154 /* Dummy functions -- we don't use thread-based audio */
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155 void Core_WaitAudio(_THIS)
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156 {
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157 return;
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158 }
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159
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160 void Core_PlayAudio(_THIS)
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161 {
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162 return;
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163 }
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164
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165 Uint8 *Core_GetAudioBuf(_THIS)
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166 {
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167 return(NULL);
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168 }
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169
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170 void Core_CloseAudio(_THIS)
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diff changeset
171 {
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172 OSStatus result;
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173 struct AURenderCallbackStruct callback;
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174
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175 /* stop processing the audio unit */
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diff changeset
176 result = AudioOutputUnitStop (outputAudioUnit);
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177 if (result != noErr) {
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178 SDL_SetError("Core_CloseAudio: AudioOutputUnitStop");
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179 return;
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180 }
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181
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182 /* Remove the input callback */
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183 callback.inputProc = 0;
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184 callback.inputProcRefCon = 0;
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185 result = AudioUnitSetProperty (outputAudioUnit,
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diff changeset
186 kAudioUnitProperty_SetRenderCallback,
935
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187 kAudioUnitScope_Input,
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188 0,
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189 &callback,
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190 sizeof(callback));
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191 if (result != noErr) {
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192 SDL_SetError("Core_CloseAudio: AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)");
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193 return;
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194 }
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195
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196 result = CloseComponent(outputAudioUnit);
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197 if (result != noErr) {
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198 SDL_SetError("Core_CloseAudio: CloseComponent");
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199 return;
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200 }
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diff changeset
201
1336
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diff changeset
202 SDL_free(buffer);
935
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203 }
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204
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diff changeset
205 #define CHECK_RESULT(msg) \
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206 if (result != noErr) { \
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diff changeset
207 SDL_SetError("Failed to start CoreAudio: " msg); \
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diff changeset
208 return -1; \
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diff changeset
209 }
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diff changeset
210
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
211
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diff changeset
212 int Core_OpenAudio(_THIS, SDL_AudioSpec *spec)
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diff changeset
213 {
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214 OSStatus result = noErr;
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215 Component comp;
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216 ComponentDescription desc;
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diff changeset
217 struct AURenderCallbackStruct callback;
935
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diff changeset
218 AudioStreamBasicDescription requestedDesc;
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diff changeset
219
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diff changeset
220 /* Setup a AudioStreamBasicDescription with the requested format */
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diff changeset
221 requestedDesc.mFormatID = kAudioFormatLinearPCM;
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diff changeset
222 requestedDesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
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diff changeset
223 requestedDesc.mChannelsPerFrame = spec->channels;
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diff changeset
224 requestedDesc.mSampleRate = spec->freq;
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diff changeset
225
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diff changeset
226 requestedDesc.mBitsPerChannel = spec->format & 0xFF;
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diff changeset
227 if (spec->format & 0x8000)
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diff changeset
228 requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
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diff changeset
229 if (spec->format & 0x1000)
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diff changeset
230 requestedDesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
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diff changeset
231
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diff changeset
232 requestedDesc.mFramesPerPacket = 1;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
233 requestedDesc.mBytesPerFrame = requestedDesc.mBitsPerChannel * requestedDesc.mChannelsPerFrame / 8;
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diff changeset
234 requestedDesc.mBytesPerPacket = requestedDesc.mBytesPerFrame * requestedDesc.mFramesPerPacket;
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diff changeset
235
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
236
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
237 /* Locate the default output audio unit */
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diff changeset
238 desc.componentType = kAudioUnitType_Output;
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diff changeset
239 desc.componentSubType = kAudioUnitSubType_DefaultOutput;
95213cf5efcc Fixed CoreAudio to compile with Mac OS X 10.6 SDK and 64-bit targets.
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diff changeset
240 desc.componentManufacturer = kAudioUnitManufacturer_Apple;
935
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diff changeset
241 desc.componentFlags = 0;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
242 desc.componentFlagsMask = 0;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
243
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
244 comp = FindNextComponent (NULL, &desc);
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diff changeset
245 if (comp == NULL) {
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
246 SDL_SetError ("Failed to start CoreAudio: FindNextComponent returned NULL");
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parents:
diff changeset
247 return -1;
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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parents:
diff changeset
248 }
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
249
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
250 /* Open & initialize the default output audio unit */
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diff changeset
251 result = OpenAComponent (comp, &outputAudioUnit);
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parents:
diff changeset
252 CHECK_RESULT("OpenAComponent")
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diff changeset
253
f8d5ddc7aef1 Audio improvements from Max Horn, including a new CoreAudio driver for MacOSX
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diff changeset
254 result = AudioUnitInitialize (outputAudioUnit);
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255 CHECK_RESULT("AudioUnitInitialize")
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256
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257 /* Set the input format of the audio unit. */
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258 result = AudioUnitSetProperty (outputAudioUnit,
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259 kAudioUnitProperty_StreamFormat,
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260 kAudioUnitScope_Input,
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261 0,
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262 &requestedDesc,
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263 sizeof (requestedDesc));
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264 CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_StreamFormat)")
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265
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266 /* Set the audio callback */
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267 callback.inputProc = audioCallback;
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268 callback.inputProcRefCon = this;
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269 result = AudioUnitSetProperty (outputAudioUnit,
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270 kAudioUnitProperty_SetRenderCallback,
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271 kAudioUnitScope_Input,
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272 0,
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273 &callback,
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274 sizeof(callback));
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275 CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)")
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276
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277 /* Calculate the final parameters for this audio specification */
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278 SDL_CalculateAudioSpec(spec);
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279
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280 /* Allocate a sample buffer */
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281 bufferOffset = bufferSize = this->spec.size;
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282 buffer = SDL_malloc(bufferSize);
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283
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284 /* Finally, start processing of the audio unit */
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285 result = AudioOutputUnitStart (outputAudioUnit);
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286 CHECK_RESULT("AudioOutputUnitStart")
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287
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288
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289 /* We're running! */
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290 return(1);
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291 }