Mercurial > sdl-ios-xcode
annotate src/audio/macrom/SDL_romaudio.c @ 4001:6831b8723a85 SDL-1.2
Don't initialize the audio buffer passed to the application's audio callback,
since they are expected to entirely fill it with data or silence.
For legacy apps that might expect the buffer to already have silence and thus
may not fill the buffer in the callback, there's an environment variable to
expose the old behaviour.
Fixes Bugzilla #416.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Thu, 05 Jul 2007 02:24:36 +0000 |
| parents | f12379c41042 |
| children | 782fd950bd46 c121d94672cb a1b03ba2fcd0 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 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 |
| 0 | 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. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
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13 Lesser General Public License for more details. |
| 0 | 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 |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
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24 #if defined(__APPLE__) && defined(__MACH__) |
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25 # include <Carbon/Carbon.h> |
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26 #elif TARGET_API_MAC_CARBON && (UNIVERSAL_INTERFACES_VERSION > 0x0335) |
| 0 | 27 # include <Carbon.h> |
| 28 #else | |
| 29 # include <Sound.h> /* SoundManager interface */ | |
| 30 # include <Gestalt.h> | |
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31 # include <DriverServices.h> |
| 0 | 32 #endif |
| 33 | |
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34 #if !defined(NewSndCallBackUPP) && (UNIVERSAL_INTERFACES_VERSION < 0x0335) |
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35 #if !defined(NewSndCallBackProc) /* avoid circular redefinition... */ |
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36 #define NewSndCallBackUPP NewSndCallBackProc |
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37 #endif |
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38 #if !defined(NewSndCallBackUPP) |
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39 #define NewSndCallBackUPP NewSndCallBackProc |
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40 #endif |
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41 #endif |
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42 |
| 0 | 43 #include "SDL_audio.h" |
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44 #include "../SDL_audio_c.h" |
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45 #include "../SDL_sysaudio.h" |
| 0 | 46 #include "SDL_romaudio.h" |
| 47 | |
| 48 /* Audio driver functions */ | |
| 49 | |
| 50 static void Mac_CloseAudio(_THIS); | |
| 51 static int Mac_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
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52 static void Mac_LockAudio(_THIS); |
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53 static void Mac_UnlockAudio(_THIS); |
| 0 | 54 |
| 55 /* Audio driver bootstrap functions */ | |
| 56 | |
| 57 | |
| 58 static int Audio_Available(void) | |
| 59 { | |
| 60 return(1); | |
| 61 } | |
| 62 | |
| 63 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 64 { | |
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65 SDL_free(device->hidden); |
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66 SDL_free(device); |
| 0 | 67 } |
| 68 | |
| 69 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 70 { | |
| 71 SDL_AudioDevice *this; | |
| 72 | |
| 73 /* Initialize all variables that we clean on shutdown */ | |
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74 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 0 | 75 if ( this ) { |
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76 SDL_memset(this, 0, (sizeof *this)); |
| 0 | 77 this->hidden = (struct SDL_PrivateAudioData *) |
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78 SDL_malloc((sizeof *this->hidden)); |
| 0 | 79 } |
| 80 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 81 SDL_OutOfMemory(); | |
| 82 if ( this ) { | |
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83 SDL_free(this); |
| 0 | 84 } |
| 85 return(0); | |
| 86 } | |
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87 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| 0 | 88 |
| 89 /* Set the function pointers */ | |
| 90 this->OpenAudio = Mac_OpenAudio; | |
| 91 this->CloseAudio = Mac_CloseAudio; | |
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92 this->LockAudio = Mac_LockAudio; |
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93 this->UnlockAudio = Mac_UnlockAudio; |
| 0 | 94 this->free = Audio_DeleteDevice; |
| 95 | |
| 1621 | 96 #ifdef __MACOSX__ /* Mac OS X uses threaded audio, so normal thread code is okay */ |
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97 this->LockAudio = NULL; |
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98 this->UnlockAudio = NULL; |
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99 #endif |
| 0 | 100 return this; |
| 101 } | |
| 102 | |
| 103 AudioBootStrap SNDMGR_bootstrap = { | |
| 104 "sndmgr", "MacOS SoundManager 3.0", | |
| 105 Audio_Available, Audio_CreateDevice | |
| 106 }; | |
| 107 | |
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108 #if defined(TARGET_API_MAC_CARBON) || defined(USE_RYANS_SOUNDCODE) |
| 1621 | 109 /* This works correctly on Mac OS X */ |
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110 |
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111 #pragma options align=power |
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112 |
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113 static volatile SInt32 audio_is_locked = 0; |
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114 static volatile SInt32 need_to_mix = 0; |
| 0 | 115 |
| 116 static UInt8 *buffer[2]; | |
| 117 static volatile UInt32 running = 0; | |
| 118 static CmpSoundHeader header; | |
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119 static volatile Uint32 fill_me = 0; |
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120 |
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121 static void mix_buffer(SDL_AudioDevice *audio, UInt8 *buffer) |
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122 { |
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123 if ( ! audio->paused ) { |
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124 #ifdef __MACOSX__ |
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125 SDL_mutexP(audio->mixer_lock); |
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126 #endif |
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127 if ( audio->convert.needed ) { |
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128 audio->spec.callback(audio->spec.userdata, |
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129 (Uint8 *)audio->convert.buf,audio->convert.len); |
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130 SDL_ConvertAudio(&audio->convert); |
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131 if ( audio->convert.len_cvt != audio->spec.size ) { |
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132 /* Uh oh... probably crashes here */; |
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133 } |
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134 SDL_memcpy(buffer, audio->convert.buf, audio->convert.len_cvt); |
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135 } else { |
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136 audio->spec.callback(audio->spec.userdata, buffer, audio->spec.size); |
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137 } |
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138 #ifdef __MACOSX__ |
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139 SDL_mutexV(audio->mixer_lock); |
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140 #endif |
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141 } |
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142 |
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143 DecrementAtomic((SInt32 *) &need_to_mix); |
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144 } |
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145 |
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146 static void Mac_LockAudio(_THIS) |
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147 { |
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148 IncrementAtomic((SInt32 *) &audio_is_locked); |
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149 } |
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150 |
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151 static void Mac_UnlockAudio(_THIS) |
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152 { |
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153 SInt32 oldval; |
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154 |
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155 oldval = DecrementAtomic((SInt32 *) &audio_is_locked); |
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156 if ( oldval != 1 ) /* != 1 means audio is still locked. */ |
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157 return; |
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158 |
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159 /* Did we miss the chance to mix in an interrupt? Do it now. */ |
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160 if ( BitAndAtomic (0xFFFFFFFF, (UInt32 *) &need_to_mix) ) { |
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161 /* |
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162 * Note that this could be a problem if you missed an interrupt |
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163 * while the audio was locked, and get preempted by a second |
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164 * interrupt here, but that means you locked for way too long anyhow. |
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165 */ |
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166 mix_buffer (this, buffer[fill_me]); |
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167 } |
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168 } |
| 0 | 169 |
| 170 static void callBackProc (SndChannel *chan, SndCommand *cmd_passed ) { | |
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171 UInt32 play_me; |
| 0 | 172 SndCommand cmd; |
| 173 SDL_AudioDevice *audio = (SDL_AudioDevice *)chan->userInfo; | |
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174 |
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175 IncrementAtomic((SInt32 *) &need_to_mix); |
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176 |
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177 fill_me = cmd_passed->param2; /* buffer that has just finished playing, so fill it */ |
| 0 | 178 play_me = ! fill_me; /* filled buffer to play _now_ */ |
| 179 | |
| 180 if ( ! audio->enabled ) { | |
| 181 return; | |
| 182 } | |
| 183 | |
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184 /* queue previously mixed buffer for playback. */ |
| 0 | 185 header.samplePtr = (Ptr)buffer[play_me]; |
| 186 cmd.cmd = bufferCmd; | |
| 187 cmd.param1 = 0; | |
| 188 cmd.param2 = (long)&header; | |
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189 SndDoCommand (chan, &cmd, 0); |
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190 |
| 0 | 191 memset (buffer[fill_me], 0, audio->spec.size); |
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192 |
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193 /* |
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194 * if audio device isn't locked, mix the next buffer to be queued in |
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195 * the memory block that just finished playing. |
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196 */ |
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197 if ( ! BitAndAtomic(0xFFFFFFFF, (UInt32 *) &audio_is_locked) ) { |
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198 mix_buffer (audio, buffer[fill_me]); |
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199 } |
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200 |
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201 /* set this callback to run again when current buffer drains. */ |
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202 if ( running ) { |
| 0 | 203 cmd.cmd = callBackCmd; |
| 204 cmd.param1 = 0; | |
| 205 cmd.param2 = play_me; | |
| 206 | |
| 207 SndDoCommand (chan, &cmd, 0); | |
| 208 } | |
| 209 } | |
| 210 | |
| 211 static int Mac_OpenAudio(_THIS, SDL_AudioSpec *spec) { | |
| 212 | |
| 213 SndCallBackUPP callback; | |
| 214 int sample_bits; | |
| 215 int i; | |
| 216 long initOptions; | |
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217 |
| 0 | 218 /* Very few conversions are required, but... */ |
| 219 switch (spec->format) { | |
| 220 case AUDIO_S8: | |
| 221 spec->format = AUDIO_U8; | |
| 222 break; | |
| 223 case AUDIO_U16LSB: | |
| 224 spec->format = AUDIO_S16LSB; | |
| 225 break; | |
| 226 case AUDIO_U16MSB: | |
| 227 spec->format = AUDIO_S16MSB; | |
| 228 break; | |
| 229 } | |
| 230 SDL_CalculateAudioSpec(spec); | |
| 231 | |
| 232 /* initialize bufferCmd header */ | |
| 233 memset (&header, 0, sizeof(header)); | |
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234 callback = (SndCallBackUPP) NewSndCallBackUPP (callBackProc); |
| 0 | 235 sample_bits = spec->size / spec->samples / spec->channels * 8; |
| 236 | |
| 237 #ifdef DEBUG_AUDIO | |
| 238 fprintf(stderr, | |
| 239 "Audio format 0x%x, channels = %d, sample_bits = %d, frequency = %d\n", | |
| 240 spec->format, spec->channels, sample_bits, spec->freq); | |
| 241 #endif /* DEBUG_AUDIO */ | |
| 242 | |
| 243 header.numChannels = spec->channels; | |
| 244 header.sampleSize = sample_bits; | |
| 245 header.sampleRate = spec->freq << 16; | |
| 246 header.numFrames = spec->samples; | |
| 247 header.encode = cmpSH; | |
| 248 | |
| 249 /* Note that we install the 16bitLittleEndian Converter if needed. */ | |
| 250 if ( spec->format == 0x8010 ) { | |
| 251 header.compressionID = fixedCompression; | |
| 252 header.format = k16BitLittleEndianFormat; | |
| 253 } | |
| 254 | |
| 255 /* allocate 2 buffers */ | |
| 256 for (i=0; i<2; i++) { | |
| 257 buffer[i] = (UInt8*)malloc (sizeof(UInt8) * spec->size); | |
| 258 if (buffer[i] == NULL) { | |
| 259 SDL_OutOfMemory(); | |
| 260 return (-1); | |
| 261 } | |
| 262 memset (buffer[i], 0, spec->size); | |
| 263 } | |
| 264 | |
| 265 /* Create the sound manager channel */ | |
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266 channel = (SndChannelPtr)SDL_malloc(sizeof(*channel)); |
| 0 | 267 if ( channel == NULL ) { |
| 268 SDL_OutOfMemory(); | |
| 269 return(-1); | |
| 270 } | |
| 271 if ( spec->channels >= 2 ) { | |
| 272 initOptions = initStereo; | |
| 273 } else { | |
| 274 initOptions = initMono; | |
| 275 } | |
| 276 channel->userInfo = (long)this; | |
| 277 channel->qLength = 128; | |
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278 if ( SndNewChannel(&channel, sampledSynth, initOptions, callback) != noErr ) { |
| 0 | 279 SDL_SetError("Unable to create audio channel"); |
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280 SDL_free(channel); |
| 0 | 281 channel = NULL; |
| 282 return(-1); | |
| 283 } | |
| 284 | |
| 285 /* start playback */ | |
| 286 { | |
| 287 SndCommand cmd; | |
| 288 cmd.cmd = callBackCmd; | |
| 289 cmd.param2 = 0; | |
| 290 running = 1; | |
| 291 SndDoCommand (channel, &cmd, 0); | |
| 292 } | |
| 293 | |
| 294 return 1; | |
| 295 } | |
| 296 | |
| 297 static void Mac_CloseAudio(_THIS) { | |
| 298 | |
| 299 int i; | |
| 300 | |
| 301 running = 0; | |
| 302 | |
| 303 if (channel) { | |
| 304 SndDisposeChannel (channel, true); | |
| 305 channel = NULL; | |
| 306 } | |
| 307 | |
| 308 for ( i=0; i<2; ++i ) { | |
| 309 if ( buffer[i] ) { | |
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310 SDL_free(buffer[i]); |
| 0 | 311 buffer[i] = NULL; |
| 312 } | |
| 313 } | |
| 314 } | |
| 315 | |
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316 #else /* !TARGET_API_MAC_CARBON && !USE_RYANS_SOUNDCODE */ |
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317 |
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318 static void Mac_LockAudio(_THIS) |
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319 { |
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320 /* no-op. */ |
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321 } |
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322 |
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323 static void Mac_UnlockAudio(_THIS) |
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324 { |
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325 /* no-op. */ |
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326 } |
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327 |
| 0 | 328 |
| 329 /* This function is called by Sound Manager when it has exhausted one of | |
| 330 the buffers, so we'll zero it to silence and fill it with audio if | |
| 331 we're not paused. | |
| 332 */ | |
| 333 static pascal | |
| 334 void sndDoubleBackProc (SndChannelPtr chan, SndDoubleBufferPtr newbuf) | |
| 335 { | |
| 336 SDL_AudioDevice *audio = (SDL_AudioDevice *)newbuf->dbUserInfo[0]; | |
| 337 | |
| 338 /* If audio is quitting, don't do anything */ | |
| 339 if ( ! audio->enabled ) { | |
| 340 return; | |
| 341 } | |
| 342 memset (newbuf->dbSoundData, 0, audio->spec.size); | |
| 343 newbuf->dbNumFrames = audio->spec.samples; | |
| 344 if ( ! audio->paused ) { | |
| 345 if ( audio->convert.needed ) { | |
| 346 audio->spec.callback(audio->spec.userdata, | |
| 347 (Uint8 *)audio->convert.buf,audio->convert.len); | |
| 348 SDL_ConvertAudio(&audio->convert); | |
| 349 #if 0 | |
| 350 if ( audio->convert.len_cvt != audio->spec.size ) { | |
| 351 /* Uh oh... probably crashes here */; | |
| 352 } | |
| 353 #endif | |
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354 SDL_memcpy(newbuf->dbSoundData, audio->convert.buf, |
| 0 | 355 audio->convert.len_cvt); |
| 356 } else { | |
| 357 audio->spec.callback(audio->spec.userdata, | |
| 358 (Uint8 *)newbuf->dbSoundData, audio->spec.size); | |
| 359 } | |
| 360 } | |
| 361 newbuf->dbFlags |= dbBufferReady; | |
| 362 } | |
| 363 | |
| 364 static int DoubleBufferAudio_Available(void) | |
| 365 { | |
| 366 int available; | |
| 367 NumVersion sndversion; | |
| 368 long response; | |
| 369 | |
| 370 available = 0; | |
| 371 sndversion = SndSoundManagerVersion(); | |
| 372 if ( sndversion.majorRev >= 3 ) { | |
| 373 if ( Gestalt(gestaltSoundAttr, &response) == noErr ) { | |
| 374 if ( (response & (1 << gestaltSndPlayDoubleBuffer)) ) { | |
| 375 available = 1; | |
| 376 } | |
| 377 } | |
| 378 } else { | |
| 379 if ( Gestalt(gestaltSoundAttr, &response) == noErr ) { | |
| 380 if ( (response & (1 << gestaltHasASC)) ) { | |
| 381 available = 1; | |
| 382 } | |
| 383 } | |
| 384 } | |
| 385 return(available); | |
| 386 } | |
| 387 | |
| 388 static void Mac_CloseAudio(_THIS) | |
| 389 { | |
| 390 int i; | |
| 391 | |
| 392 if ( channel != NULL ) { | |
| 393 /* Clean up the audio channel */ | |
| 394 SndDisposeChannel(channel, true); | |
| 395 channel = NULL; | |
| 396 } | |
| 397 for ( i=0; i<2; ++i ) { | |
| 398 if ( audio_buf[i] ) { | |
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399 SDL_free(audio_buf[i]); |
| 0 | 400 audio_buf[i] = NULL; |
| 401 } | |
| 402 } | |
| 403 } | |
| 404 | |
| 405 static int Mac_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 406 { | |
| 407 SndDoubleBufferHeader2 audio_dbh; | |
| 408 int i; | |
| 409 long initOptions; | |
| 410 int sample_bits; | |
| 411 SndDoubleBackUPP doubleBackProc; | |
| 412 | |
| 413 /* Check to make sure double-buffered audio is available */ | |
| 414 if ( ! DoubleBufferAudio_Available() ) { | |
| 415 SDL_SetError("Sound manager doesn't support double-buffering"); | |
| 416 return(-1); | |
| 417 } | |
| 418 | |
| 419 /* Very few conversions are required, but... */ | |
| 420 switch (spec->format) { | |
| 421 case AUDIO_S8: | |
| 422 spec->format = AUDIO_U8; | |
| 423 break; | |
| 424 case AUDIO_U16LSB: | |
| 425 spec->format = AUDIO_S16LSB; | |
| 426 break; | |
| 427 case AUDIO_U16MSB: | |
| 428 spec->format = AUDIO_S16MSB; | |
| 429 break; | |
| 430 } | |
| 431 SDL_CalculateAudioSpec(spec); | |
| 432 | |
| 433 /* initialize the double-back header */ | |
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434 SDL_memset(&audio_dbh, 0, sizeof(audio_dbh)); |
| 0 | 435 doubleBackProc = NewSndDoubleBackProc (sndDoubleBackProc); |
| 436 sample_bits = spec->size / spec->samples / spec->channels * 8; | |
| 437 | |
| 438 audio_dbh.dbhNumChannels = spec->channels; | |
| 439 audio_dbh.dbhSampleSize = sample_bits; | |
| 440 audio_dbh.dbhCompressionID = 0; | |
| 441 audio_dbh.dbhPacketSize = 0; | |
| 442 audio_dbh.dbhSampleRate = spec->freq << 16; | |
| 443 audio_dbh.dbhDoubleBack = doubleBackProc; | |
| 444 audio_dbh.dbhFormat = 0; | |
| 445 | |
| 446 /* Note that we install the 16bitLittleEndian Converter if needed. */ | |
| 447 if ( spec->format == 0x8010 ) { | |
| 448 audio_dbh.dbhCompressionID = fixedCompression; | |
| 449 audio_dbh.dbhFormat = k16BitLittleEndianFormat; | |
| 450 } | |
| 451 | |
| 452 /* allocate the 2 double-back buffers */ | |
| 453 for ( i=0; i<2; ++i ) { | |
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454 audio_buf[i] = SDL_calloc(1, sizeof(SndDoubleBuffer)+spec->size); |
| 0 | 455 if ( audio_buf[i] == NULL ) { |
| 456 SDL_OutOfMemory(); | |
| 457 return(-1); | |
| 458 } | |
| 459 audio_buf[i]->dbNumFrames = spec->samples; | |
| 460 audio_buf[i]->dbFlags = dbBufferReady; | |
| 461 audio_buf[i]->dbUserInfo[0] = (long)this; | |
| 462 audio_dbh.dbhBufferPtr[i] = audio_buf[i]; | |
| 463 } | |
| 464 | |
| 465 /* Create the sound manager channel */ | |
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466 channel = (SndChannelPtr)SDL_malloc(sizeof(*channel)); |
| 0 | 467 if ( channel == NULL ) { |
| 468 SDL_OutOfMemory(); | |
| 469 return(-1); | |
| 470 } | |
| 471 if ( spec->channels >= 2 ) { | |
| 472 initOptions = initStereo; | |
| 473 } else { | |
| 474 initOptions = initMono; | |
| 475 } | |
| 476 channel->userInfo = 0; | |
| 477 channel->qLength = 128; | |
| 478 if ( SndNewChannel(&channel, sampledSynth, initOptions, 0L) != noErr ) { | |
| 479 SDL_SetError("Unable to create audio channel"); | |
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480 SDL_free(channel); |
| 0 | 481 channel = NULL; |
| 482 return(-1); | |
| 483 } | |
| 484 | |
| 485 /* Start playback */ | |
| 486 if ( SndPlayDoubleBuffer(channel, (SndDoubleBufferHeaderPtr)&audio_dbh) | |
| 487 != noErr ) { | |
| 488 SDL_SetError("Unable to play double buffered audio"); | |
| 489 return(-1); | |
| 490 } | |
| 491 | |
| 492 return 1; | |
| 493 } | |
| 494 | |
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495 #endif /* TARGET_API_MAC_CARBON || USE_RYANS_SOUNDCODE */ |
| 0 | 496 |