Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 4100:ad8bdb215737 SDL-1.2
Stephen Hurd fixed bug #505
Borland compilers have the alloca() prototype in malloc.h as with WATCOM.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 28 Dec 2007 08:06:36 +0000 |
| parents | 009d85e98922 |
| children | 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 |
| 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_PULSE |
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50 &PULSE_bootstrap, |
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51 #endif |
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52 #if SDL_AUDIO_DRIVER_QNXNTO |
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53 &QNXNTOAUDIO_bootstrap, |
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54 #endif |
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55 #if SDL_AUDIO_DRIVER_SUNAUDIO |
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56 &SUNAUDIO_bootstrap, |
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57 #endif |
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58 #if SDL_AUDIO_DRIVER_DMEDIA |
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59 &DMEDIA_bootstrap, |
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60 #endif |
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61 #if SDL_AUDIO_DRIVER_ARTS |
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62 &ARTS_bootstrap, |
| 0 | 63 #endif |
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64 #if SDL_AUDIO_DRIVER_ESD |
| 0 | 65 &ESD_bootstrap, |
| 66 #endif | |
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67 #if SDL_AUDIO_DRIVER_NAS |
| 0 | 68 &NAS_bootstrap, |
| 69 #endif | |
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70 #if SDL_AUDIO_DRIVER_DSOUND |
| 0 | 71 &DSOUND_bootstrap, |
| 72 #endif | |
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73 #if SDL_AUDIO_DRIVER_WAVEOUT |
| 0 | 74 &WAVEOUT_bootstrap, |
| 75 #endif | |
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76 #if SDL_AUDIO_DRIVER_PAUD |
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77 &Paud_bootstrap, |
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78 #endif |
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79 #if SDL_AUDIO_DRIVER_BAUDIO |
| 0 | 80 &BAUDIO_bootstrap, |
| 81 #endif | |
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82 #if SDL_AUDIO_DRIVER_COREAUDIO |
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83 &COREAUDIO_bootstrap, |
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84 #endif |
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85 #if SDL_AUDIO_DRIVER_SNDMGR |
| 0 | 86 &SNDMGR_bootstrap, |
| 87 #endif | |
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88 #if SDL_AUDIO_DRIVER_MINT |
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89 &MINTAUDIO_GSXB_bootstrap, |
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90 &MINTAUDIO_MCSN_bootstrap, |
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91 &MINTAUDIO_STFA_bootstrap, |
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92 &MINTAUDIO_XBIOS_bootstrap, |
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93 &MINTAUDIO_DMA8_bootstrap, |
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94 #endif |
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95 #if SDL_AUDIO_DRIVER_DISK |
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96 &DISKAUD_bootstrap, |
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97 #endif |
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98 #if SDL_AUDIO_DRIVER_DUMMY |
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99 &DUMMYAUD_bootstrap, |
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100 #endif |
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101 #if SDL_AUDIO_DRIVER_DC |
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102 &DCAUD_bootstrap, |
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103 #endif |
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104 #if SDL_AUDIO_DRIVER_NDS |
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105 &NDSAUD_bootstrap, |
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106 #endif |
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107 #if SDL_AUDIO_DRIVER_MMEAUDIO |
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108 &MMEAUDIO_bootstrap, |
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109 #endif |
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110 #if SDL_AUDIO_DRIVER_DART |
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111 &DART_bootstrap, |
| 1190 | 112 #endif |
| 3975 | 113 #if SDL_AUDIO_DRIVER_EPOCAUDIO |
| 114 &EPOCAudio_bootstrap, | |
| 115 #endif | |
| 0 | 116 NULL |
| 117 }; | |
| 118 SDL_AudioDevice *current_audio = NULL; | |
| 119 | |
| 120 /* Various local functions */ | |
| 121 int SDL_AudioInit(const char *driver_name); | |
| 122 void SDL_AudioQuit(void); | |
| 123 | |
| 124 /* The general mixing thread function */ | |
| 1769 | 125 int SDLCALL SDL_RunAudio(void *audiop) |
| 0 | 126 { |
| 127 SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; | |
| 128 Uint8 *stream; | |
| 129 int stream_len; | |
| 130 void *udata; | |
| 1769 | 131 void (SDLCALL *fill)(void *userdata,Uint8 *stream, int len); |
| 0 | 132 int silence; |
| 133 | |
| 134 /* Perform any thread setup */ | |
| 135 if ( audio->ThreadInit ) { | |
| 136 audio->ThreadInit(audio); | |
| 137 } | |
| 138 audio->threadid = SDL_ThreadID(); | |
| 139 | |
| 140 /* Set up the mixing function */ | |
| 141 fill = audio->spec.callback; | |
| 142 udata = audio->spec.userdata; | |
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143 |
| 0 | 144 if ( audio->convert.needed ) { |
| 145 if ( audio->convert.src_format == AUDIO_U8 ) { | |
| 146 silence = 0x80; | |
| 147 } else { | |
| 148 silence = 0; | |
| 149 } | |
| 150 stream_len = audio->convert.len; | |
| 151 } else { | |
| 152 silence = audio->spec.silence; | |
| 153 stream_len = audio->spec.size; | |
| 154 } | |
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155 |
| 1190 | 156 #ifdef __OS2__ |
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157 /* Increase the priority of this thread to make sure that |
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158 the audio will be continuous all the time! */ |
| 1190 | 159 #ifdef USE_DOSSETPRIORITY |
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160 if (SDL_getenv("SDL_USE_TIMECRITICAL_AUDIO")) |
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161 { |
| 1190 | 162 #ifdef DEBUG_BUILD |
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163 printf("[SDL_RunAudio] : Setting priority to TimeCritical+0! (TID%d)\n", SDL_ThreadID()); |
| 1190 | 164 #endif |
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165 DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0); |
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166 } |
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167 else |
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168 { |
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169 #ifdef DEBUG_BUILD |
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170 printf("[SDL_RunAudio] : Setting priority to ForegroundServer+0! (TID%d)\n", SDL_ThreadID()); |
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171 #endif |
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172 DosSetPriority(PRTYS_THREAD, PRTYC_FOREGROUNDSERVER, 0, 0); |
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173 } |
| 1190 | 174 #endif |
| 175 #endif | |
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176 |
| 0 | 177 /* Loop, filling the audio buffers */ |
| 178 while ( audio->enabled ) { | |
| 179 | |
| 180 /* Fill the current buffer with sound */ | |
| 181 if ( audio->convert.needed ) { | |
| 182 if ( audio->convert.buf ) { | |
| 183 stream = audio->convert.buf; | |
| 184 } else { | |
| 185 continue; | |
| 186 } | |
| 187 } else { | |
| 188 stream = audio->GetAudioBuf(audio); | |
| 189 if ( stream == NULL ) { | |
| 190 stream = audio->fake_stream; | |
| 191 } | |
| 192 } | |
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193 |
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194 SDL_memset(stream, silence, stream_len); |
| 0 | 195 |
| 196 if ( ! audio->paused ) { | |
| 197 SDL_mutexP(audio->mixer_lock); | |
| 198 (*fill)(udata, stream, stream_len); | |
| 199 SDL_mutexV(audio->mixer_lock); | |
| 200 } | |
| 201 | |
| 202 /* Convert the audio if necessary */ | |
| 203 if ( audio->convert.needed ) { | |
| 204 SDL_ConvertAudio(&audio->convert); | |
| 205 stream = audio->GetAudioBuf(audio); | |
| 206 if ( stream == NULL ) { | |
| 207 stream = audio->fake_stream; | |
| 208 } | |
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209 SDL_memcpy(stream, audio->convert.buf, |
| 0 | 210 audio->convert.len_cvt); |
| 211 } | |
| 212 | |
| 213 /* Ready current buffer for play and change current buffer */ | |
| 214 if ( stream != audio->fake_stream ) { | |
| 215 audio->PlayAudio(audio); | |
| 1562 | 216 } |
| 217 | |
| 218 /* Wait for an audio buffer to become available */ | |
| 219 if ( stream == audio->fake_stream ) { | |
| 220 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); | |
| 221 } else { | |
| 222 audio->WaitAudio(audio); | |
| 0 | 223 } |
| 224 } | |
| 1562 | 225 |
| 0 | 226 /* Wait for the audio to drain.. */ |
| 227 if ( audio->WaitDone ) { | |
| 228 audio->WaitDone(audio); | |
| 229 } | |
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230 |
| 1190 | 231 #ifdef __OS2__ |
| 232 #ifdef DEBUG_BUILD | |
| 233 printf("[SDL_RunAudio] : Task exiting. (TID%d)\n", SDL_ThreadID()); | |
| 234 #endif | |
| 235 #endif | |
| 0 | 236 return(0); |
| 237 } | |
| 238 | |
|
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239 static void SDL_LockAudio_Default(SDL_AudioDevice *audio) |
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240 { |
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241 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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242 return; |
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243 } |
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244 SDL_mutexP(audio->mixer_lock); |
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245 } |
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246 |
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247 static void SDL_UnlockAudio_Default(SDL_AudioDevice *audio) |
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248 { |
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249 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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250 return; |
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251 } |
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252 SDL_mutexV(audio->mixer_lock); |
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253 } |
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254 |
| 1794 | 255 static Uint16 SDL_ParseAudioFormat(const char *string) |
| 256 { | |
| 257 Uint16 format = 0; | |
| 258 | |
| 259 switch (*string) { | |
| 260 case 'U': | |
| 261 ++string; | |
| 262 format |= 0x0000; | |
| 263 break; | |
| 264 case 'S': | |
| 265 ++string; | |
| 266 format |= 0x8000; | |
| 267 break; | |
| 268 default: | |
| 269 return 0; | |
| 270 } | |
| 271 switch (SDL_atoi(string)) { | |
| 272 case 8: | |
| 273 string += 1; | |
| 274 format |= 8; | |
| 275 break; | |
| 276 case 16: | |
| 277 string += 2; | |
| 278 format |= 16; | |
| 279 if ( SDL_strcmp(string, "LSB") == 0 | |
| 280 #if SDL_BYTEORDER == SDL_LIL_ENDIAN | |
| 281 || SDL_strcmp(string, "SYS") == 0 | |
| 282 #endif | |
| 283 ) { | |
| 284 format |= 0x0000; | |
| 285 } | |
| 286 if ( SDL_strcmp(string, "MSB") == 0 | |
| 287 #if SDL_BYTEORDER == SDL_BIG_ENDIAN | |
| 288 || SDL_strcmp(string, "SYS") == 0 | |
| 289 #endif | |
| 290 ) { | |
| 291 format |= 0x1000; | |
| 292 } | |
| 293 break; | |
| 294 default: | |
| 295 return 0; | |
| 296 } | |
| 297 return format; | |
| 298 } | |
| 299 | |
| 0 | 300 int SDL_AudioInit(const char *driver_name) |
| 301 { | |
| 302 SDL_AudioDevice *audio; | |
| 303 int i = 0, idx; | |
| 304 | |
| 305 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 306 if ( current_audio != NULL ) { | |
| 307 SDL_AudioQuit(); | |
| 308 } | |
| 309 | |
| 310 /* Select the proper audio driver */ | |
| 311 audio = NULL; | |
| 312 idx = 0; | |
|
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313 #if SDL_AUDIO_DRIVER_ESD |
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314 if ( (driver_name == NULL) && (SDL_getenv("ESPEAKER") != NULL) ) { |
| 0 | 315 /* Ahem, we know that if ESPEAKER is set, user probably wants |
| 316 to use ESD, but don't start it if it's not already running. | |
| 317 This probably isn't the place to do this, but... Shh! :) | |
| 318 */ | |
| 319 for ( i=0; bootstrap[i]; ++i ) { | |
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320 if ( SDL_strcasecmp(bootstrap[i]->name, "esd") == 0 ) { |
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321 #ifdef HAVE_PUTENV |
| 0 | 322 const char *esd_no_spawn; |
| 323 | |
| 324 /* Don't start ESD if it's not running */ | |
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325 esd_no_spawn = getenv("ESD_NO_SPAWN"); |
| 0 | 326 if ( esd_no_spawn == NULL ) { |
| 327 putenv("ESD_NO_SPAWN=1"); | |
| 328 } | |
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329 #endif |
| 0 | 330 if ( bootstrap[i]->available() ) { |
| 331 audio = bootstrap[i]->create(0); | |
| 332 break; | |
| 333 } | |
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334 #ifdef HAVE_UNSETENV |
| 0 | 335 if ( esd_no_spawn == NULL ) { |
| 336 unsetenv("ESD_NO_SPAWN"); | |
| 337 } | |
| 338 #endif | |
| 339 } | |
| 340 } | |
| 341 } | |
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342 #endif /* SDL_AUDIO_DRIVER_ESD */ |
| 0 | 343 if ( audio == NULL ) { |
| 344 if ( driver_name != NULL ) { | |
| 345 #if 0 /* This will be replaced with a better driver selection API */ | |
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346 if ( SDL_strrchr(driver_name, ':') != NULL ) { |
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347 idx = atoi(SDL_strrchr(driver_name, ':')+1); |
| 0 | 348 } |
| 349 #endif | |
| 350 for ( i=0; bootstrap[i]; ++i ) { | |
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351 if (SDL_strcasecmp(bootstrap[i]->name, driver_name) == 0) { |
| 0 | 352 if ( bootstrap[i]->available() ) { |
| 353 audio=bootstrap[i]->create(idx); | |
| 354 break; | |
| 355 } | |
| 356 } | |
| 357 } | |
| 358 } else { | |
| 359 for ( i=0; bootstrap[i]; ++i ) { | |
| 360 if ( bootstrap[i]->available() ) { | |
| 361 audio = bootstrap[i]->create(idx); | |
| 362 if ( audio != NULL ) { | |
| 363 break; | |
| 364 } | |
| 365 } | |
| 366 } | |
| 367 } | |
| 368 if ( audio == NULL ) { | |
| 369 SDL_SetError("No available audio device"); | |
| 370 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 371 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 372 */ | |
| 373 return(-1); | |
| 374 #endif | |
| 375 } | |
| 376 } | |
| 377 current_audio = audio; | |
| 378 if ( current_audio ) { | |
| 379 current_audio->name = bootstrap[i]->name; | |
|
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380 if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
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381 current_audio->LockAudio = SDL_LockAudio_Default; |
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382 current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
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383 } |
| 0 | 384 } |
| 385 return(0); | |
| 386 } | |
| 387 | |
| 388 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 389 { | |
| 390 if ( current_audio != NULL ) { | |
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391 SDL_strlcpy(namebuf, current_audio->name, maxlen); |
| 0 | 392 return(namebuf); |
| 393 } | |
| 394 return(NULL); | |
| 395 } | |
| 396 | |
| 397 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 398 { | |
| 399 SDL_AudioDevice *audio; | |
| 1794 | 400 const char *env; |
| 0 | 401 |
| 402 /* Start up the audio driver, if necessary */ | |
| 403 if ( ! current_audio ) { | |
| 404 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 405 (current_audio == NULL) ) { | |
| 406 return(-1); | |
| 407 } | |
| 408 } | |
| 409 audio = current_audio; | |
| 410 | |
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411 if (audio->opened) { |
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412 SDL_SetError("Audio device is already opened"); |
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413 return(-1); |
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414 } |
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415 |
| 0 | 416 /* Verify some parameters */ |
| 1794 | 417 if ( desired->freq == 0 ) { |
| 418 env = SDL_getenv("SDL_AUDIO_FREQUENCY"); | |
| 419 if ( env ) { | |
| 420 desired->freq = SDL_atoi(env); | |
| 421 } | |
| 422 } | |
| 423 if ( desired->freq == 0 ) { | |
| 424 /* Pick some default audio frequency */ | |
| 425 desired->freq = 22050; | |
| 426 } | |
| 427 if ( desired->format == 0 ) { | |
| 428 env = SDL_getenv("SDL_AUDIO_FORMAT"); | |
| 429 if ( env ) { | |
| 430 desired->format = SDL_ParseAudioFormat(env); | |
| 431 } | |
| 432 } | |
| 433 if ( desired->format == 0 ) { | |
| 434 /* Pick some default audio format */ | |
| 435 desired->format = AUDIO_S16; | |
| 436 } | |
| 437 if ( desired->channels == 0 ) { | |
| 438 env = SDL_getenv("SDL_AUDIO_CHANNELS"); | |
| 439 if ( env ) { | |
| 4044 | 440 desired->channels = (Uint8)SDL_atoi(env); |
| 1794 | 441 } |
| 442 } | |
| 443 if ( desired->channels == 0 ) { | |
| 444 /* Pick a default number of channels */ | |
| 445 desired->channels = 2; | |
| 0 | 446 } |
| 447 switch ( desired->channels ) { | |
| 448 case 1: /* Mono */ | |
| 449 case 2: /* Stereo */ | |
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450 case 4: /* surround */ |
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451 case 6: /* surround with center and lfe */ |
| 0 | 452 break; |
| 453 default: | |
| 454 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 455 return(-1); | |
| 456 } | |
| 1794 | 457 if ( desired->samples == 0 ) { |
| 458 env = SDL_getenv("SDL_AUDIO_SAMPLES"); | |
| 459 if ( env ) { | |
| 4044 | 460 desired->samples = (Uint16)SDL_atoi(env); |
| 1794 | 461 } |
| 462 } | |
| 463 if ( desired->samples == 0 ) { | |
| 464 /* Pick a default of ~46 ms at desired frequency */ | |
| 465 int samples = (desired->freq / 1000) * 46; | |
| 466 int power2 = 1; | |
| 467 while ( power2 < samples ) { | |
| 468 power2 *= 2; | |
| 469 } | |
| 470 desired->samples = power2; | |
| 471 } | |
| 472 if ( desired->callback == NULL ) { | |
| 473 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 474 return(-1); | |
| 475 } | |
| 0 | 476 |
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477 #if SDL_THREADS_DISABLED |
|
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478 /* Uses interrupt driven audio, without thread */ |
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479 #else |
| 0 | 480 /* Create a semaphore for locking the sound buffers */ |
| 481 audio->mixer_lock = SDL_CreateMutex(); | |
| 482 if ( audio->mixer_lock == NULL ) { | |
| 483 SDL_SetError("Couldn't create mixer lock"); | |
| 484 SDL_CloseAudio(); | |
| 485 return(-1); | |
| 486 } | |
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487 #endif /* SDL_THREADS_DISABLED */ |
| 0 | 488 |
| 489 /* Calculate the silence and size of the audio specification */ | |
| 490 SDL_CalculateAudioSpec(desired); | |
| 491 | |
| 492 /* Open the audio subsystem */ | |
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493 SDL_memcpy(&audio->spec, desired, sizeof(audio->spec)); |
| 0 | 494 audio->convert.needed = 0; |
| 495 audio->enabled = 1; | |
| 496 audio->paused = 1; | |
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497 |
| 0 | 498 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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499 |
| 0 | 500 if ( ! audio->opened ) { |
| 501 SDL_CloseAudio(); | |
| 502 return(-1); | |
| 503 } | |
| 504 | |
| 505 /* If the audio driver changes the buffer size, accept it */ | |
| 506 if ( audio->spec.samples != desired->samples ) { | |
| 507 desired->samples = audio->spec.samples; | |
| 508 SDL_CalculateAudioSpec(desired); | |
| 509 } | |
| 510 | |
| 511 /* Allocate a fake audio memory buffer */ | |
| 512 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 513 if ( audio->fake_stream == NULL ) { | |
| 514 SDL_CloseAudio(); | |
| 515 SDL_OutOfMemory(); | |
| 516 return(-1); | |
| 517 } | |
| 518 | |
| 519 /* See if we need to do any conversion */ | |
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520 if ( obtained != NULL ) { |
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521 SDL_memcpy(obtained, &audio->spec, sizeof(audio->spec)); |
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522 } else if ( desired->freq != audio->spec.freq || |
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523 desired->format != audio->spec.format || |
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524 desired->channels != audio->spec.channels ) { |
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525 /* Build an audio conversion block */ |
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526 if ( SDL_BuildAudioCVT(&audio->convert, |
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527 desired->format, desired->channels, |
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528 desired->freq, |
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529 audio->spec.format, audio->spec.channels, |
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530 audio->spec.freq) < 0 ) { |
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531 SDL_CloseAudio(); |
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532 return(-1); |
| 0 | 533 } |
|
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534 if ( audio->convert.needed ) { |
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535 audio->convert.len = (int) ( ((double) desired->size) / |
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536 audio->convert.len_ratio ); |
|
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537 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( |
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538 audio->convert.len*audio->convert.len_mult); |
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539 if ( audio->convert.buf == NULL ) { |
| 0 | 540 SDL_CloseAudio(); |
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541 SDL_OutOfMemory(); |
| 0 | 542 return(-1); |
| 543 } | |
| 544 } | |
| 545 } | |
| 546 | |
| 547 /* Start the audio thread if necessary */ | |
| 548 switch (audio->opened) { | |
| 549 case 1: | |
| 550 /* Start the audio thread */ | |
| 3975 | 551 #if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC) && !defined(__SYMBIAN32__) |
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552 #undef SDL_CreateThread |
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553 audio->thread = SDL_CreateThread(SDL_RunAudio, audio, NULL, NULL); |
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554 #else |
| 0 | 555 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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556 #endif |
| 0 | 557 if ( audio->thread == NULL ) { |
| 558 SDL_CloseAudio(); | |
| 559 SDL_SetError("Couldn't create audio thread"); | |
| 560 return(-1); | |
| 561 } | |
| 562 break; | |
| 563 | |
| 564 default: | |
| 565 /* The audio is now playing */ | |
| 566 break; | |
| 567 } | |
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568 |
| 0 | 569 return(0); |
| 570 } | |
| 571 | |
| 572 SDL_audiostatus SDL_GetAudioStatus(void) | |
| 573 { | |
| 574 SDL_AudioDevice *audio = current_audio; | |
| 575 SDL_audiostatus status; | |
| 576 | |
| 577 status = SDL_AUDIO_STOPPED; | |
| 578 if ( audio && audio->enabled ) { | |
| 579 if ( audio->paused ) { | |
| 580 status = SDL_AUDIO_PAUSED; | |
| 581 } else { | |
| 582 status = SDL_AUDIO_PLAYING; | |
| 583 } | |
| 584 } | |
| 585 return(status); | |
| 586 } | |
| 587 | |
| 588 void SDL_PauseAudio (int pause_on) | |
| 589 { | |
| 590 SDL_AudioDevice *audio = current_audio; | |
| 591 | |
| 592 if ( audio ) { | |
| 593 audio->paused = pause_on; | |
| 594 } | |
| 595 } | |
| 596 | |
| 597 void SDL_LockAudio (void) | |
| 598 { | |
| 599 SDL_AudioDevice *audio = current_audio; | |
| 600 | |
| 601 /* Obtain a lock on the mixing buffers */ | |
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602 if ( audio && audio->LockAudio ) { |
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603 audio->LockAudio(audio); |
| 0 | 604 } |
| 605 } | |
| 606 | |
| 607 void SDL_UnlockAudio (void) | |
| 608 { | |
| 609 SDL_AudioDevice *audio = current_audio; | |
| 610 | |
| 611 /* Release lock on the mixing buffers */ | |
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612 if ( audio && audio->UnlockAudio ) { |
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613 audio->UnlockAudio(audio); |
| 0 | 614 } |
| 615 } | |
| 616 | |
| 617 void SDL_CloseAudio (void) | |
| 618 { | |
| 619 SDL_QuitSubSystem(SDL_INIT_AUDIO); | |
| 620 } | |
| 621 | |
| 622 void SDL_AudioQuit(void) | |
| 623 { | |
| 624 SDL_AudioDevice *audio = current_audio; | |
| 625 | |
| 626 if ( audio ) { | |
| 627 audio->enabled = 0; | |
| 628 if ( audio->thread != NULL ) { | |
| 629 SDL_WaitThread(audio->thread, NULL); | |
| 630 } | |
| 631 if ( audio->mixer_lock != NULL ) { | |
| 632 SDL_DestroyMutex(audio->mixer_lock); | |
| 633 } | |
| 634 if ( audio->fake_stream != NULL ) { | |
| 635 SDL_FreeAudioMem(audio->fake_stream); | |
| 636 } | |
| 637 if ( audio->convert.needed ) { | |
| 638 SDL_FreeAudioMem(audio->convert.buf); | |
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639 |
| 0 | 640 } |
| 641 if ( audio->opened ) { | |
| 642 audio->CloseAudio(audio); | |
| 643 audio->opened = 0; | |
| 644 } | |
| 645 /* Free the driver data */ | |
| 646 audio->free(audio); | |
| 647 current_audio = NULL; | |
| 648 } | |
| 649 } | |
| 650 | |
| 651 #define NUM_FORMATS 6 | |
| 652 static int format_idx; | |
| 653 static int format_idx_sub; | |
| 654 static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { | |
| 655 { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 656 { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 657 { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 658 { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 659 { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 660 { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 661 }; | |
| 662 | |
| 663 Uint16 SDL_FirstAudioFormat(Uint16 format) | |
| 664 { | |
| 665 for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { | |
| 666 if ( format_list[format_idx][0] == format ) { | |
| 667 break; | |
| 668 } | |
| 669 } | |
| 670 format_idx_sub = 0; | |
| 671 return(SDL_NextAudioFormat()); | |
| 672 } | |
| 673 | |
| 674 Uint16 SDL_NextAudioFormat(void) | |
| 675 { | |
| 676 if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { | |
| 677 return(0); | |
| 678 } | |
| 679 return(format_list[format_idx][format_idx_sub++]); | |
| 680 } | |
| 681 | |
| 682 void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) | |
| 683 { | |
| 684 switch (spec->format) { | |
| 685 case AUDIO_U8: | |
| 686 spec->silence = 0x80; | |
| 687 break; | |
| 688 default: | |
| 689 spec->silence = 0x00; | |
| 690 break; | |
| 691 } | |
| 692 spec->size = (spec->format&0xFF)/8; | |
| 693 spec->size *= spec->channels; | |
| 694 spec->size *= spec->samples; | |
| 695 } |