Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 4414:2e253188dcd2 SDL-1.2-olpc
Closing obsolete SDL-1.2-olpc named branch
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Sun, 28 Feb 2010 00:21:35 -0500 |
| parents | 6d2e1961661a |
| children | 42e83d81224b |
| 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 |
| 24 /* Allow access to a raw mixing buffer */ | |
| 25 | |
| 26 #include "SDL.h" | |
| 27 #include "SDL_audio_c.h" | |
| 28 #include "SDL_audiomem.h" | |
| 29 #include "SDL_sysaudio.h" | |
| 30 | |
| 1190 | 31 #ifdef __OS2__ |
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32 /* We'll need the DosSetPriority() API! */ |
| 1190 | 33 #define INCL_DOSPROCESS |
| 34 #include <os2.h> | |
| 35 #endif | |
| 36 | |
| 0 | 37 /* Available audio drivers */ |
| 38 static AudioBootStrap *bootstrap[] = { | |
|
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39 #if SDL_AUDIO_DRIVER_BSD |
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40 &BSD_AUDIO_bootstrap, |
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41 #endif |
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42 #if SDL_AUDIO_DRIVER_OSS |
| 0 | 43 &DSP_bootstrap, |
| 44 &DMA_bootstrap, | |
| 45 #endif | |
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46 #if SDL_AUDIO_DRIVER_ALSA |
| 0 | 47 &ALSA_bootstrap, |
| 48 #endif | |
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49 #if SDL_AUDIO_DRIVER_QNXNTO |
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50 &QNXNTOAUDIO_bootstrap, |
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51 #endif |
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52 #if SDL_AUDIO_DRIVER_SUNAUDIO |
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53 &SUNAUDIO_bootstrap, |
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54 #endif |
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55 #if SDL_AUDIO_DRIVER_DMEDIA |
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56 &DMEDIA_bootstrap, |
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57 #endif |
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58 #if SDL_AUDIO_DRIVER_ARTS |
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59 &ARTS_bootstrap, |
| 0 | 60 #endif |
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61 #if SDL_AUDIO_DRIVER_ESD |
| 0 | 62 &ESD_bootstrap, |
| 63 #endif | |
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64 #if SDL_AUDIO_DRIVER_NAS |
| 0 | 65 &NAS_bootstrap, |
| 66 #endif | |
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67 #if SDL_AUDIO_DRIVER_DSOUND |
| 0 | 68 &DSOUND_bootstrap, |
| 69 #endif | |
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70 #if SDL_AUDIO_DRIVER_WAVEOUT |
| 0 | 71 &WAVEOUT_bootstrap, |
| 72 #endif | |
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73 #if SDL_AUDIO_DRIVER_PAUD |
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74 &Paud_bootstrap, |
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75 #endif |
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76 #if SDL_AUDIO_DRIVER_BAUDIO |
| 0 | 77 &BAUDIO_bootstrap, |
| 78 #endif | |
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79 #if SDL_AUDIO_DRIVER_COREAUDIO |
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80 &COREAUDIO_bootstrap, |
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81 #endif |
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82 #if SDL_AUDIO_DRIVER_SNDMGR |
| 0 | 83 &SNDMGR_bootstrap, |
| 84 #endif | |
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85 #if SDL_AUDIO_DRIVER_MINT |
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86 &MINTAUDIO_GSXB_bootstrap, |
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87 &MINTAUDIO_MCSN_bootstrap, |
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88 &MINTAUDIO_STFA_bootstrap, |
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89 &MINTAUDIO_XBIOS_bootstrap, |
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90 &MINTAUDIO_DMA8_bootstrap, |
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91 #endif |
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92 #if SDL_AUDIO_DRIVER_DISK |
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93 &DISKAUD_bootstrap, |
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94 #endif |
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95 #if SDL_AUDIO_DRIVER_DUMMY |
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96 &DUMMYAUD_bootstrap, |
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97 #endif |
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98 #if SDL_AUDIO_DRIVER_DC |
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99 &DCAUD_bootstrap, |
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100 #endif |
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101 #if SDL_AUDIO_DRIVER_MMEAUDIO |
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102 &MMEAUDIO_bootstrap, |
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103 #endif |
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104 #if SDL_AUDIO_DRIVER_DART |
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105 &DART_bootstrap, |
| 1190 | 106 #endif |
| 0 | 107 NULL |
| 108 }; | |
| 109 SDL_AudioDevice *current_audio = NULL; | |
| 110 | |
| 111 /* Various local functions */ | |
| 112 int SDL_AudioInit(const char *driver_name); | |
| 113 void SDL_AudioQuit(void); | |
| 114 | |
| 115 /* The general mixing thread function */ | |
| 1769 | 116 int SDLCALL SDL_RunAudio(void *audiop) |
| 0 | 117 { |
| 118 SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; | |
| 119 Uint8 *stream; | |
| 120 int stream_len; | |
| 121 void *udata; | |
| 1769 | 122 void (SDLCALL *fill)(void *userdata,Uint8 *stream, int len); |
| 0 | 123 int silence; |
| 124 | |
| 125 /* Perform any thread setup */ | |
| 126 if ( audio->ThreadInit ) { | |
| 127 audio->ThreadInit(audio); | |
| 128 } | |
| 129 audio->threadid = SDL_ThreadID(); | |
| 130 | |
| 131 /* Set up the mixing function */ | |
| 132 fill = audio->spec.callback; | |
| 133 udata = audio->spec.userdata; | |
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134 |
| 0 | 135 if ( audio->convert.needed ) { |
| 136 if ( audio->convert.src_format == AUDIO_U8 ) { | |
| 137 silence = 0x80; | |
| 138 } else { | |
| 139 silence = 0; | |
| 140 } | |
| 141 stream_len = audio->convert.len; | |
| 142 } else { | |
| 143 silence = audio->spec.silence; | |
| 144 stream_len = audio->spec.size; | |
| 145 } | |
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146 |
| 1190 | 147 #ifdef __OS2__ |
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148 /* Increase the priority of this thread to make sure that |
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149 the audio will be continuous all the time! */ |
| 1190 | 150 #ifdef USE_DOSSETPRIORITY |
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151 if (SDL_getenv("SDL_USE_TIMECRITICAL_AUDIO")) |
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152 { |
| 1190 | 153 #ifdef DEBUG_BUILD |
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154 printf("[SDL_RunAudio] : Setting priority to TimeCritical+0! (TID%d)\n", SDL_ThreadID()); |
| 1190 | 155 #endif |
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156 DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0); |
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157 } |
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158 else |
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159 { |
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160 #ifdef DEBUG_BUILD |
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161 printf("[SDL_RunAudio] : Setting priority to ForegroundServer+0! (TID%d)\n", SDL_ThreadID()); |
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162 #endif |
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163 DosSetPriority(PRTYS_THREAD, PRTYC_FOREGROUNDSERVER, 0, 0); |
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164 } |
| 1190 | 165 #endif |
| 166 #endif | |
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167 |
| 0 | 168 /* Loop, filling the audio buffers */ |
| 169 while ( audio->enabled ) { | |
| 170 | |
| 171 /* Fill the current buffer with sound */ | |
| 172 if ( audio->convert.needed ) { | |
| 173 if ( audio->convert.buf ) { | |
| 174 stream = audio->convert.buf; | |
| 175 } else { | |
| 176 continue; | |
| 177 } | |
| 178 } else { | |
| 179 stream = audio->GetAudioBuf(audio); | |
| 180 if ( stream == NULL ) { | |
| 181 stream = audio->fake_stream; | |
| 182 } | |
| 183 } | |
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184 SDL_memset(stream, silence, stream_len); |
| 0 | 185 |
| 186 if ( ! audio->paused ) { | |
| 187 SDL_mutexP(audio->mixer_lock); | |
| 188 (*fill)(udata, stream, stream_len); | |
| 189 SDL_mutexV(audio->mixer_lock); | |
| 190 } | |
| 191 | |
| 192 /* Convert the audio if necessary */ | |
| 193 if ( audio->convert.needed ) { | |
| 194 SDL_ConvertAudio(&audio->convert); | |
| 195 stream = audio->GetAudioBuf(audio); | |
| 196 if ( stream == NULL ) { | |
| 197 stream = audio->fake_stream; | |
| 198 } | |
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199 SDL_memcpy(stream, audio->convert.buf, |
| 0 | 200 audio->convert.len_cvt); |
| 201 } | |
| 202 | |
| 203 /* Ready current buffer for play and change current buffer */ | |
| 204 if ( stream != audio->fake_stream ) { | |
| 205 audio->PlayAudio(audio); | |
| 1562 | 206 } |
| 207 | |
| 208 /* Wait for an audio buffer to become available */ | |
| 209 if ( stream == audio->fake_stream ) { | |
| 210 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); | |
| 211 } else { | |
| 212 audio->WaitAudio(audio); | |
| 0 | 213 } |
| 214 } | |
| 1562 | 215 |
| 0 | 216 /* Wait for the audio to drain.. */ |
| 217 if ( audio->WaitDone ) { | |
| 218 audio->WaitDone(audio); | |
| 219 } | |
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220 |
| 1190 | 221 #ifdef __OS2__ |
| 222 #ifdef DEBUG_BUILD | |
| 223 printf("[SDL_RunAudio] : Task exiting. (TID%d)\n", SDL_ThreadID()); | |
| 224 #endif | |
| 225 #endif | |
| 0 | 226 return(0); |
| 227 } | |
| 228 | |
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229 static void SDL_LockAudio_Default(SDL_AudioDevice *audio) |
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230 { |
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231 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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232 return; |
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233 } |
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234 SDL_mutexP(audio->mixer_lock); |
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235 } |
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236 |
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237 static void SDL_UnlockAudio_Default(SDL_AudioDevice *audio) |
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238 { |
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239 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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240 return; |
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241 } |
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242 SDL_mutexV(audio->mixer_lock); |
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243 } |
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244 |
| 1794 | 245 static Uint16 SDL_ParseAudioFormat(const char *string) |
| 246 { | |
| 247 Uint16 format = 0; | |
| 248 | |
| 249 switch (*string) { | |
| 250 case 'U': | |
| 251 ++string; | |
| 252 format |= 0x0000; | |
| 253 break; | |
| 254 case 'S': | |
| 255 ++string; | |
| 256 format |= 0x8000; | |
| 257 break; | |
| 258 default: | |
| 259 return 0; | |
| 260 } | |
| 261 switch (SDL_atoi(string)) { | |
| 262 case 8: | |
| 263 string += 1; | |
| 264 format |= 8; | |
| 265 break; | |
| 266 case 16: | |
| 267 string += 2; | |
| 268 format |= 16; | |
| 269 if ( SDL_strcmp(string, "LSB") == 0 | |
| 270 #if SDL_BYTEORDER == SDL_LIL_ENDIAN | |
| 271 || SDL_strcmp(string, "SYS") == 0 | |
| 272 #endif | |
| 273 ) { | |
| 274 format |= 0x0000; | |
| 275 } | |
| 276 if ( SDL_strcmp(string, "MSB") == 0 | |
| 277 #if SDL_BYTEORDER == SDL_BIG_ENDIAN | |
| 278 || SDL_strcmp(string, "SYS") == 0 | |
| 279 #endif | |
| 280 ) { | |
| 281 format |= 0x1000; | |
| 282 } | |
| 283 break; | |
| 284 default: | |
| 285 return 0; | |
| 286 } | |
| 287 return format; | |
| 288 } | |
| 289 | |
| 0 | 290 int SDL_AudioInit(const char *driver_name) |
| 291 { | |
| 292 SDL_AudioDevice *audio; | |
| 293 int i = 0, idx; | |
| 294 | |
| 295 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 296 if ( current_audio != NULL ) { | |
| 297 SDL_AudioQuit(); | |
| 298 } | |
| 299 | |
| 300 /* Select the proper audio driver */ | |
| 301 audio = NULL; | |
| 302 idx = 0; | |
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303 #if SDL_AUDIO_DRIVER_ESD |
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304 if ( (driver_name == NULL) && (SDL_getenv("ESPEAKER") != NULL) ) { |
| 0 | 305 /* Ahem, we know that if ESPEAKER is set, user probably wants |
| 306 to use ESD, but don't start it if it's not already running. | |
| 307 This probably isn't the place to do this, but... Shh! :) | |
| 308 */ | |
| 309 for ( i=0; bootstrap[i]; ++i ) { | |
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310 if ( SDL_strcasecmp(bootstrap[i]->name, "esd") == 0 ) { |
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311 #ifdef HAVE_PUTENV |
| 0 | 312 const char *esd_no_spawn; |
| 313 | |
| 314 /* Don't start ESD if it's not running */ | |
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315 esd_no_spawn = getenv("ESD_NO_SPAWN"); |
| 0 | 316 if ( esd_no_spawn == NULL ) { |
| 317 putenv("ESD_NO_SPAWN=1"); | |
| 318 } | |
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319 #endif |
| 0 | 320 if ( bootstrap[i]->available() ) { |
| 321 audio = bootstrap[i]->create(0); | |
| 322 break; | |
| 323 } | |
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324 #ifdef HAVE_UNSETENV |
| 0 | 325 if ( esd_no_spawn == NULL ) { |
| 326 unsetenv("ESD_NO_SPAWN"); | |
| 327 } | |
| 328 #endif | |
| 329 } | |
| 330 } | |
| 331 } | |
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332 #endif /* SDL_AUDIO_DRIVER_ESD */ |
| 0 | 333 if ( audio == NULL ) { |
| 334 if ( driver_name != NULL ) { | |
| 335 #if 0 /* This will be replaced with a better driver selection API */ | |
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336 if ( SDL_strrchr(driver_name, ':') != NULL ) { |
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337 idx = atoi(SDL_strrchr(driver_name, ':')+1); |
| 0 | 338 } |
| 339 #endif | |
| 340 for ( i=0; bootstrap[i]; ++i ) { | |
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341 if (SDL_strcasecmp(bootstrap[i]->name, driver_name) == 0) { |
| 0 | 342 if ( bootstrap[i]->available() ) { |
| 343 audio=bootstrap[i]->create(idx); | |
| 344 break; | |
| 345 } | |
| 346 } | |
| 347 } | |
| 348 } else { | |
| 349 for ( i=0; bootstrap[i]; ++i ) { | |
| 350 if ( bootstrap[i]->available() ) { | |
| 351 audio = bootstrap[i]->create(idx); | |
| 352 if ( audio != NULL ) { | |
| 353 break; | |
| 354 } | |
| 355 } | |
| 356 } | |
| 357 } | |
| 358 if ( audio == NULL ) { | |
| 359 SDL_SetError("No available audio device"); | |
| 360 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 361 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 362 */ | |
| 363 return(-1); | |
| 364 #endif | |
| 365 } | |
| 366 } | |
| 367 current_audio = audio; | |
| 368 if ( current_audio ) { | |
| 369 current_audio->name = bootstrap[i]->name; | |
|
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370 if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
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371 current_audio->LockAudio = SDL_LockAudio_Default; |
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372 current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
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373 } |
| 0 | 374 } |
| 375 return(0); | |
| 376 } | |
| 377 | |
| 378 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 379 { | |
| 380 if ( current_audio != NULL ) { | |
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381 SDL_strlcpy(namebuf, current_audio->name, maxlen); |
| 0 | 382 return(namebuf); |
| 383 } | |
| 384 return(NULL); | |
| 385 } | |
| 386 | |
| 387 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 388 { | |
| 389 SDL_AudioDevice *audio; | |
| 1794 | 390 const char *env; |
| 0 | 391 |
| 392 /* Start up the audio driver, if necessary */ | |
| 393 if ( ! current_audio ) { | |
| 394 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 395 (current_audio == NULL) ) { | |
| 396 return(-1); | |
| 397 } | |
| 398 } | |
| 399 audio = current_audio; | |
| 400 | |
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401 if (audio->opened) { |
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402 SDL_SetError("Audio device is already opened"); |
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403 return(-1); |
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404 } |
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405 |
| 0 | 406 /* Verify some parameters */ |
| 1794 | 407 if ( desired->freq == 0 ) { |
| 408 env = SDL_getenv("SDL_AUDIO_FREQUENCY"); | |
| 409 if ( env ) { | |
| 410 desired->freq = SDL_atoi(env); | |
| 411 } | |
| 412 } | |
| 413 if ( desired->freq == 0 ) { | |
| 414 /* Pick some default audio frequency */ | |
| 415 desired->freq = 22050; | |
| 416 } | |
| 417 if ( desired->format == 0 ) { | |
| 418 env = SDL_getenv("SDL_AUDIO_FORMAT"); | |
| 419 if ( env ) { | |
| 420 desired->format = SDL_ParseAudioFormat(env); | |
| 421 } | |
| 422 } | |
| 423 if ( desired->format == 0 ) { | |
| 424 /* Pick some default audio format */ | |
| 425 desired->format = AUDIO_S16; | |
| 426 } | |
| 427 if ( desired->channels == 0 ) { | |
| 428 env = SDL_getenv("SDL_AUDIO_CHANNELS"); | |
| 429 if ( env ) { | |
| 430 desired->channels = SDL_atoi(env); | |
| 431 } | |
| 432 } | |
| 433 if ( desired->channels == 0 ) { | |
| 434 /* Pick a default number of channels */ | |
| 435 desired->channels = 2; | |
| 0 | 436 } |
| 437 switch ( desired->channels ) { | |
| 438 case 1: /* Mono */ | |
| 439 case 2: /* Stereo */ | |
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440 case 4: /* surround */ |
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441 case 6: /* surround with center and lfe */ |
| 0 | 442 break; |
| 443 default: | |
| 444 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 445 return(-1); | |
| 446 } | |
| 1794 | 447 if ( desired->samples == 0 ) { |
| 448 env = SDL_getenv("SDL_AUDIO_SAMPLES"); | |
| 449 if ( env ) { | |
| 450 desired->samples = SDL_atoi(env); | |
| 451 } | |
| 452 } | |
| 453 if ( desired->samples == 0 ) { | |
| 454 /* Pick a default of ~46 ms at desired frequency */ | |
| 455 int samples = (desired->freq / 1000) * 46; | |
| 456 int power2 = 1; | |
| 457 while ( power2 < samples ) { | |
| 458 power2 *= 2; | |
| 459 } | |
| 460 desired->samples = power2; | |
| 461 } | |
| 462 if ( desired->callback == NULL ) { | |
| 463 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 464 return(-1); | |
| 465 } | |
| 0 | 466 |
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467 #if defined(__MACOS__) || (defined(__RISCOS__) && SDL_THREADS_DISABLED) |
| 0 | 468 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ |
| 469 #else | |
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470 #if defined(__MINT__) && SDL_THREADS_DISABLED |
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471 /* Uses interrupt driven audio, without thread */ |
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472 #else |
| 0 | 473 /* Create a semaphore for locking the sound buffers */ |
| 474 audio->mixer_lock = SDL_CreateMutex(); | |
| 475 if ( audio->mixer_lock == NULL ) { | |
| 476 SDL_SetError("Couldn't create mixer lock"); | |
| 477 SDL_CloseAudio(); | |
| 478 return(-1); | |
| 479 } | |
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480 #endif /* __MINT__ */ |
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481 #endif /* __MACOS__ */ |
| 0 | 482 |
| 483 /* Calculate the silence and size of the audio specification */ | |
| 484 SDL_CalculateAudioSpec(desired); | |
| 485 | |
| 486 /* Open the audio subsystem */ | |
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487 SDL_memcpy(&audio->spec, desired, sizeof(audio->spec)); |
| 0 | 488 audio->convert.needed = 0; |
| 489 audio->enabled = 1; | |
| 490 audio->paused = 1; | |
|
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491 |
| 0 | 492 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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493 |
| 0 | 494 if ( ! audio->opened ) { |
| 495 SDL_CloseAudio(); | |
| 496 return(-1); | |
| 497 } | |
| 498 | |
| 499 /* If the audio driver changes the buffer size, accept it */ | |
| 500 if ( audio->spec.samples != desired->samples ) { | |
| 501 desired->samples = audio->spec.samples; | |
| 502 SDL_CalculateAudioSpec(desired); | |
| 503 } | |
| 504 | |
| 505 /* Allocate a fake audio memory buffer */ | |
| 506 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 507 if ( audio->fake_stream == NULL ) { | |
| 508 SDL_CloseAudio(); | |
| 509 SDL_OutOfMemory(); | |
| 510 return(-1); | |
| 511 } | |
| 512 | |
| 513 /* See if we need to do any conversion */ | |
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514 if ( obtained != NULL ) { |
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515 SDL_memcpy(obtained, &audio->spec, sizeof(audio->spec)); |
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516 } else if ( desired->freq != audio->spec.freq || |
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517 desired->format != audio->spec.format || |
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518 desired->channels != audio->spec.channels ) { |
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519 /* Build an audio conversion block */ |
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520 if ( SDL_BuildAudioCVT(&audio->convert, |
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521 desired->format, desired->channels, |
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522 desired->freq, |
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523 audio->spec.format, audio->spec.channels, |
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524 audio->spec.freq) < 0 ) { |
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525 SDL_CloseAudio(); |
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526 return(-1); |
| 0 | 527 } |
|
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528 if ( audio->convert.needed ) { |
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529 audio->convert.len = (int) ( ((double) desired->size) / |
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530 audio->convert.len_ratio ); |
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531 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( |
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532 audio->convert.len*audio->convert.len_mult); |
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533 if ( audio->convert.buf == NULL ) { |
| 0 | 534 SDL_CloseAudio(); |
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535 SDL_OutOfMemory(); |
| 0 | 536 return(-1); |
| 537 } | |
| 538 } | |
| 539 } | |
| 540 | |
| 541 /* Start the audio thread if necessary */ | |
| 542 switch (audio->opened) { | |
| 543 case 1: | |
| 544 /* Start the audio thread */ | |
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545 #if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC) |
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546 #undef SDL_CreateThread |
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547 audio->thread = SDL_CreateThread(SDL_RunAudio, audio, NULL, NULL); |
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548 #else |
| 0 | 549 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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550 #endif |
| 0 | 551 if ( audio->thread == NULL ) { |
| 552 SDL_CloseAudio(); | |
| 553 SDL_SetError("Couldn't create audio thread"); | |
| 554 return(-1); | |
| 555 } | |
| 556 break; | |
| 557 | |
| 558 default: | |
| 559 /* The audio is now playing */ | |
| 560 break; | |
| 561 } | |
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562 |
| 0 | 563 return(0); |
| 564 } | |
| 565 | |
| 566 SDL_audiostatus SDL_GetAudioStatus(void) | |
| 567 { | |
| 568 SDL_AudioDevice *audio = current_audio; | |
| 569 SDL_audiostatus status; | |
| 570 | |
| 571 status = SDL_AUDIO_STOPPED; | |
| 572 if ( audio && audio->enabled ) { | |
| 573 if ( audio->paused ) { | |
| 574 status = SDL_AUDIO_PAUSED; | |
| 575 } else { | |
| 576 status = SDL_AUDIO_PLAYING; | |
| 577 } | |
| 578 } | |
| 579 return(status); | |
| 580 } | |
| 581 | |
| 582 void SDL_PauseAudio (int pause_on) | |
| 583 { | |
| 584 SDL_AudioDevice *audio = current_audio; | |
| 585 | |
| 586 if ( audio ) { | |
| 587 audio->paused = pause_on; | |
| 588 } | |
| 589 } | |
| 590 | |
| 591 void SDL_LockAudio (void) | |
| 592 { | |
| 593 SDL_AudioDevice *audio = current_audio; | |
| 594 | |
| 595 /* Obtain a lock on the mixing buffers */ | |
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596 if ( audio && audio->LockAudio ) { |
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597 audio->LockAudio(audio); |
| 0 | 598 } |
| 599 } | |
| 600 | |
| 601 void SDL_UnlockAudio (void) | |
| 602 { | |
| 603 SDL_AudioDevice *audio = current_audio; | |
| 604 | |
| 605 /* Release lock on the mixing buffers */ | |
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606 if ( audio && audio->UnlockAudio ) { |
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607 audio->UnlockAudio(audio); |
| 0 | 608 } |
| 609 } | |
| 610 | |
| 611 void SDL_CloseAudio (void) | |
| 612 { | |
| 613 SDL_QuitSubSystem(SDL_INIT_AUDIO); | |
| 614 } | |
| 615 | |
| 616 void SDL_AudioQuit(void) | |
| 617 { | |
| 618 SDL_AudioDevice *audio = current_audio; | |
| 619 | |
| 620 if ( audio ) { | |
| 621 audio->enabled = 0; | |
| 622 if ( audio->thread != NULL ) { | |
| 623 SDL_WaitThread(audio->thread, NULL); | |
| 624 } | |
| 625 if ( audio->mixer_lock != NULL ) { | |
| 626 SDL_DestroyMutex(audio->mixer_lock); | |
| 627 } | |
| 628 if ( audio->fake_stream != NULL ) { | |
| 629 SDL_FreeAudioMem(audio->fake_stream); | |
| 630 } | |
| 631 if ( audio->convert.needed ) { | |
| 632 SDL_FreeAudioMem(audio->convert.buf); | |
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633 |
| 0 | 634 } |
| 635 if ( audio->opened ) { | |
| 636 audio->CloseAudio(audio); | |
| 637 audio->opened = 0; | |
| 638 } | |
| 639 /* Free the driver data */ | |
| 640 audio->free(audio); | |
| 641 current_audio = NULL; | |
| 642 } | |
| 643 } | |
| 644 | |
| 645 #define NUM_FORMATS 6 | |
| 646 static int format_idx; | |
| 647 static int format_idx_sub; | |
| 648 static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { | |
| 649 { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 650 { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 651 { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 652 { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 653 { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 654 { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 655 }; | |
| 656 | |
| 657 Uint16 SDL_FirstAudioFormat(Uint16 format) | |
| 658 { | |
| 659 for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { | |
| 660 if ( format_list[format_idx][0] == format ) { | |
| 661 break; | |
| 662 } | |
| 663 } | |
| 664 format_idx_sub = 0; | |
| 665 return(SDL_NextAudioFormat()); | |
| 666 } | |
| 667 | |
| 668 Uint16 SDL_NextAudioFormat(void) | |
| 669 { | |
| 670 if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { | |
| 671 return(0); | |
| 672 } | |
| 673 return(format_list[format_idx][format_idx_sub++]); | |
| 674 } | |
| 675 | |
| 676 void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) | |
| 677 { | |
| 678 switch (spec->format) { | |
| 679 case AUDIO_U8: | |
| 680 spec->silence = 0x80; | |
| 681 break; | |
| 682 default: | |
| 683 spec->silence = 0x00; | |
| 684 break; | |
| 685 } | |
| 686 spec->size = (spec->format&0xFF)/8; | |
| 687 spec->size *= spec->channels; | |
| 688 spec->size *= spec->samples; | |
| 689 } |