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annotate src/audio/iphoneos/SDL_coreaudio_iphone.c @ 2765:f55c87ae336b

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Final merge of Google Summer of Code 2008 work... Bring SDL to iPhone and iPod Touch by Holmes Futrell, mentored by Sam Lantinga
author Sam Lantinga <slouken@libsdl.org>
date Sat, 04 Oct 2008 06:46:59 +0000
parents
children 99210400e8b9
rev   line source
2765
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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_iphone.h"
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30
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31 #define DEBUG_COREAUDIO 0
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32
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33 static void
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34 COREAUDIO_Deinitialize(void)
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35 {
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36 }
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37
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38 /* The CoreAudio callback */
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39 static OSStatus
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40 outputCallback(void *inRefCon,
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41 AudioUnitRenderActionFlags * ioActionFlags,
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42 const AudioTimeStamp * inTimeStamp,
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43 UInt32 inBusNumber, UInt32 inNumberFrames,
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44 AudioBufferList * ioDataList)
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45 {
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46 SDL_AudioDevice *this = (SDL_AudioDevice *) inRefCon;
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47 AudioBuffer *ioData = &ioDataList->mBuffers[0];
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48 UInt32 remaining, len;
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49 void *ptr;
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50
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51 /* Is there ever more than one buffer, and what do you do with it? */
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52 if (ioDataList->mNumberBuffers != 1) {
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53 return noErr;
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54 }
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55
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56 /* Only do anything if audio is enabled and not paused */
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57 if (!this->enabled || this->paused) {
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58 SDL_memset(ioData->mData, this->spec.silence, ioData->mDataByteSize);
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59 return 0;
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60 }
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61
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62 /* No SDL conversion should be needed here, ever, since we accept
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63 any input format in OpenAudio, and leave the conversion to CoreAudio.
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64 */
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65 /*
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66 assert(!this->convert.needed);
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67 assert(this->spec.channels == ioData->mNumberChannels);
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68 */
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69
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70 remaining = ioData->mDataByteSize;
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71 ptr = ioData->mData;
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72 while (remaining > 0) {
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73 if (this->hidden->bufferOffset >= this->hidden->bufferSize) {
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74 /* Generate the data */
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75 SDL_memset(this->hidden->buffer, this->spec.silence,
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76 this->hidden->bufferSize);
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77 SDL_mutexP(this->mixer_lock);
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78 (*this->spec.callback) (this->spec.userdata, this->hidden->buffer,
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79 this->hidden->bufferSize);
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80 SDL_mutexV(this->mixer_lock);
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81 this->hidden->bufferOffset = 0;
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82 }
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83
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84 len = this->hidden->bufferSize - this->hidden->bufferOffset;
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85 if (len > remaining)
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86 len = remaining;
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87 SDL_memcpy(ptr,
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88 (char *) this->hidden->buffer + this->hidden->bufferOffset,
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89 len);
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90 ptr = (char *) ptr + len;
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91 remaining -= len;
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92 this->hidden->bufferOffset += len;
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93 }
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94
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95 return 0;
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96 }
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97
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98 static OSStatus
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99 inputCallback(void *inRefCon,
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100 AudioUnitRenderActionFlags * ioActionFlags,
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101 const AudioTimeStamp * inTimeStamp,
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102 UInt32 inBusNumber, UInt32 inNumberFrames,
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103 AudioBufferList * ioData)
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104 {
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105 //err = AudioUnitRender(afr->fAudioUnit, ioActionFlags, inTimeStamp, inBusNumber, inNumberFrames, afr->fAudioBuffer);
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106 // !!! FIXME: write me!
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107 return noErr;
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108 }
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109
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110
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111 static void
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112 COREAUDIO_CloseDevice(_THIS)
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113 {
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114 if (this->hidden != NULL) {
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115 if (this->hidden->audioUnitOpened) {
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116 OSStatus result = noErr;
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117 AURenderCallbackStruct callback;
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118 const AudioUnitElement output_bus = 0;
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119 const AudioUnitElement input_bus = 1;
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120 const int iscapture = this->iscapture;
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121 const AudioUnitElement bus =
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122 ((iscapture) ? input_bus : output_bus);
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123 const AudioUnitScope scope =
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124 ((iscapture) ? kAudioUnitScope_Output :
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125 kAudioUnitScope_Input);
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126
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127 /* stop processing the audio unit */
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128 result = AudioOutputUnitStop(this->hidden->audioUnit);
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129
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130 /* Remove the input callback */
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131 SDL_memset(&callback, '\0', sizeof(AURenderCallbackStruct));
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132 result = AudioUnitSetProperty(this->hidden->audioUnit,
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133 kAudioUnitProperty_SetRenderCallback,
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134 scope, bus, &callback,
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135 sizeof(callback));
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136
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137 //CloseComponent(this->hidden->audioUnit);
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138 this->hidden->audioUnitOpened = 0;
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139 }
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140 SDL_free(this->hidden->buffer);
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141 SDL_free(this->hidden);
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142 this->hidden = NULL;
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143 }
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144 }
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145
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146
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147 #define CHECK_RESULT(msg) \
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148 if (result != noErr) { \
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149 COREAUDIO_CloseDevice(this); \
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150 SDL_SetError("CoreAudio error (%s): %d", msg, result); \
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151 return 0; \
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152 }
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153
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154 static int
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155 prepare_audiounit(_THIS, const char *devname, int iscapture,
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156 const AudioStreamBasicDescription * strdesc)
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157 {
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158 OSStatus result = noErr;
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159 AURenderCallbackStruct callback;
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160 AudioComponentDescription desc;
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161 AudioComponent comp = NULL;
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162
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163 UInt32 enableIO = 0;
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164 const AudioUnitElement output_bus = 0;
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165 const AudioUnitElement input_bus = 1;
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166 const AudioUnitElement bus = ((iscapture) ? input_bus : output_bus);
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167 const AudioUnitScope scope = ((iscapture) ? kAudioUnitScope_Output :
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168 kAudioUnitScope_Input);
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169
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170 SDL_memset(&desc, '\0', sizeof(AudioComponentDescription));
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171 desc.componentType = kAudioUnitType_Output;
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172 desc.componentSubType = kAudioUnitSubType_RemoteIO;
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173 desc.componentManufacturer = kAudioUnitManufacturer_Apple;
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174
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175 comp = AudioComponentFindNext(NULL, &desc);
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176 if (comp == NULL) {
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177 SDL_SetError("Couldn't find requested CoreAudio component");
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178 return 0;
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179 }
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180
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181 /* Open & initialize the audio unit */
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182 /*
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183 AudioComponentInstanceNew only available on iPhone OS 2.0 and Mac OS X 10.6
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184 We can't use OpenAComponent on iPhone because it is not present
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185 */
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186 result = AudioComponentInstanceNew(comp, &this->hidden->audioUnit);
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187 CHECK_RESULT("AudioComponentInstanceNew");
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188
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189 this->hidden->audioUnitOpened = 1;
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190
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191 // !!! FIXME: this is wrong?
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192 enableIO = ((iscapture) ? 1 : 0);
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193 result = AudioUnitSetProperty(this->hidden->audioUnit,
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194 kAudioOutputUnitProperty_EnableIO,
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195 kAudioUnitScope_Input, input_bus,
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196 &enableIO, sizeof(enableIO));
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197 CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_EnableIO input)");
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198
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199 // !!! FIXME: this is wrong?
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200 enableIO = ((iscapture) ? 0 : 1);
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201 result = AudioUnitSetProperty(this->hidden->audioUnit,
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202 kAudioOutputUnitProperty_EnableIO,
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203 kAudioUnitScope_Output, output_bus,
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204 &enableIO, sizeof(enableIO));
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205 CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_EnableIO output)");
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206
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207 /*result = AudioUnitSetProperty(this->hidden->audioUnit,
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208 kAudioOutputUnitProperty_CurrentDevice,
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209 kAudioUnitScope_Global, 0,
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210 &this->hidden->deviceID,
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211 sizeof(AudioDeviceID));
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212
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213 CHECK_RESULT("AudioUnitSetProperty (kAudioOutputUnitProperty_CurrentDevice)"); */
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214
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215 /* Set the data format of the audio unit. */
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216 result = AudioUnitSetProperty(this->hidden->audioUnit,
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217 kAudioUnitProperty_StreamFormat,
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218 scope, bus, strdesc, sizeof(*strdesc));
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219 CHECK_RESULT("AudioUnitSetProperty (kAudioUnitProperty_StreamFormat)");
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220
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221 /* Set the audio callback */
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222 SDL_memset(&callback, '\0', sizeof(AURenderCallbackStruct));
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223 callback.inputProc = ((iscapture) ? inputCallback : outputCallback);
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224 callback.inputProcRefCon = this;
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225 result = AudioUnitSetProperty(this->hidden->audioUnit,
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226 kAudioUnitProperty_SetRenderCallback,
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227 scope, bus, &callback, sizeof(callback));
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228 CHECK_RESULT
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229 ("AudioUnitSetProperty (kAudioUnitProperty_SetInputCallback)");
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230
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231 /* Calculate the final parameters for this audio specification */
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232 SDL_CalculateAudioSpec(&this->spec);
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233
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234 /* Allocate a sample buffer */
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235 this->hidden->bufferOffset = this->hidden->bufferSize = this->spec.size;
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236 this->hidden->buffer = SDL_malloc(this->hidden->bufferSize);
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237
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238 result = AudioUnitInitialize(this->hidden->audioUnit);
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239 CHECK_RESULT("AudioUnitInitialize");
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240
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241 /* Finally, start processing of the audio unit */
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242 result = AudioOutputUnitStart(this->hidden->audioUnit);
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243 CHECK_RESULT("AudioOutputUnitStart");
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244 /* We're running! */
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245 return 1;
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246 }
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247
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248 static int
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249 COREAUDIO_OpenDevice(_THIS, const char *devname, int iscapture)
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250 {
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251 AudioStreamBasicDescription strdesc;
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252 SDL_AudioFormat test_format = SDL_FirstAudioFormat(this->spec.format);
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253 int valid_datatype = 0;
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254
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255 /* Initialize all variables that we clean on shutdown */
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256 this->hidden = (struct SDL_PrivateAudioData *)
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257 SDL_malloc((sizeof *this->hidden));
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258 if (this->hidden == NULL) {
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259 SDL_OutOfMemory();
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260 return (0);
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261 }
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262 SDL_memset(this->hidden, 0, (sizeof *this->hidden));
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263
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264 /* Setup a AudioStreamBasicDescription with the requested format */
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265 SDL_memset(&strdesc, '\0', sizeof(AudioStreamBasicDescription));
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266 strdesc.mFormatID = kAudioFormatLinearPCM;
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267 strdesc.mFormatFlags = kLinearPCMFormatFlagIsPacked;
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268 strdesc.mChannelsPerFrame = this->spec.channels;
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269 strdesc.mSampleRate = this->spec.freq;
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270 strdesc.mFramesPerPacket = 1;
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271
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272 while ((!valid_datatype) && (test_format)) {
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273 this->spec.format = test_format;
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274 /* Just a list of valid SDL formats, so people don't pass junk here. */
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275 switch (test_format) {
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276 case AUDIO_U8:
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277 case AUDIO_S8:
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278 case AUDIO_U16LSB:
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279 case AUDIO_S16LSB:
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280 case AUDIO_U16MSB:
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281 case AUDIO_S16MSB:
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282 case AUDIO_S32LSB:
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283 case AUDIO_S32MSB:
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284 case AUDIO_F32LSB:
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285 case AUDIO_F32MSB:
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286 valid_datatype = 1;
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287 strdesc.mBitsPerChannel = SDL_AUDIO_BITSIZE(this->spec.format);
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288 if (SDL_AUDIO_ISBIGENDIAN(this->spec.format))
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289 strdesc.mFormatFlags |= kLinearPCMFormatFlagIsBigEndian;
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290
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291 if (SDL_AUDIO_ISFLOAT(this->spec.format))
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292 strdesc.mFormatFlags |= kLinearPCMFormatFlagIsFloat;
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293 else if (SDL_AUDIO_ISSIGNED(this->spec.format))
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294 strdesc.mFormatFlags |= kLinearPCMFormatFlagIsSignedInteger;
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295 break;
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296 }
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297 }
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298
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299 if (!valid_datatype) { /* shouldn't happen, but just in case... */
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300 COREAUDIO_CloseDevice(this);
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301 SDL_SetError("Unsupported audio format");
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302 return 0;
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303 }
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304
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305 strdesc.mBytesPerFrame =
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306 strdesc.mBitsPerChannel * strdesc.mChannelsPerFrame / 8;
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307 strdesc.mBytesPerPacket =
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308 strdesc.mBytesPerFrame * strdesc.mFramesPerPacket;
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309
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310 if (!prepare_audiounit(this, devname, iscapture, &strdesc)) {
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311 COREAUDIO_CloseDevice(this);
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312 return 0; /* prepare_audiounit() will call SDL_SetError()... */
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313 }
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314
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315 return 1; /* good to go. */
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316 }
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317
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318 static int
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319 COREAUDIO_Init(SDL_AudioDriverImpl * impl)
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320 {
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321 /* Set the function pointers */
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322 impl->OpenDevice = COREAUDIO_OpenDevice;
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323 impl->CloseDevice = COREAUDIO_CloseDevice;
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324 impl->Deinitialize = COREAUDIO_Deinitialize;
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325 impl->ProvidesOwnCallbackThread = 1;
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326
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327 /* added for iPhone */
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328 impl->OnlyHasDefaultInputDevice = 1;
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329 impl->OnlyHasDefaultOutputDevice = 1;
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330 impl->HasCaptureSupport = 0; /* still needs to be written */
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331
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332 return 1;
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333 }
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334
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335 AudioBootStrap COREAUDIOIPHONE_bootstrap = {
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336 "coreaudio-iphoneos", "SDL CoreAudio (iPhone OS) audio driver",
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337 COREAUDIO_Init, 0
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338 };
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339
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340 /* vi: set ts=4 sw=4 expandtab: */