Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 3976:8582c6a5ca16 SDL-1.2
Added initial support for Nintendo DS, based on the work by Troy Davis (GPF)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 25 Jun 2007 00:50:20 +0000 |
| parents | e85e65aec22f |
| children | 6831b8723a85 |
| 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 SDL_memset(stream, silence, stream_len); |
| 0 | 194 |
| 195 if ( ! audio->paused ) { | |
| 196 SDL_mutexP(audio->mixer_lock); | |
| 197 (*fill)(udata, stream, stream_len); | |
| 198 SDL_mutexV(audio->mixer_lock); | |
| 199 } | |
| 200 | |
| 201 /* Convert the audio if necessary */ | |
| 202 if ( audio->convert.needed ) { | |
| 203 SDL_ConvertAudio(&audio->convert); | |
| 204 stream = audio->GetAudioBuf(audio); | |
| 205 if ( stream == NULL ) { | |
| 206 stream = audio->fake_stream; | |
| 207 } | |
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208 SDL_memcpy(stream, audio->convert.buf, |
| 0 | 209 audio->convert.len_cvt); |
| 210 } | |
| 211 | |
| 212 /* Ready current buffer for play and change current buffer */ | |
| 213 if ( stream != audio->fake_stream ) { | |
| 214 audio->PlayAudio(audio); | |
| 1562 | 215 } |
| 216 | |
| 217 /* Wait for an audio buffer to become available */ | |
| 218 if ( stream == audio->fake_stream ) { | |
| 219 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); | |
| 220 } else { | |
| 221 audio->WaitAudio(audio); | |
| 0 | 222 } |
| 223 } | |
| 1562 | 224 |
| 0 | 225 /* Wait for the audio to drain.. */ |
| 226 if ( audio->WaitDone ) { | |
| 227 audio->WaitDone(audio); | |
| 228 } | |
|
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229 |
| 1190 | 230 #ifdef __OS2__ |
| 231 #ifdef DEBUG_BUILD | |
| 232 printf("[SDL_RunAudio] : Task exiting. (TID%d)\n", SDL_ThreadID()); | |
| 233 #endif | |
| 234 #endif | |
| 0 | 235 return(0); |
| 236 } | |
| 237 | |
|
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238 static void SDL_LockAudio_Default(SDL_AudioDevice *audio) |
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239 { |
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240 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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241 return; |
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242 } |
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243 SDL_mutexP(audio->mixer_lock); |
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244 } |
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245 |
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246 static void SDL_UnlockAudio_Default(SDL_AudioDevice *audio) |
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247 { |
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248 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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249 return; |
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250 } |
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251 SDL_mutexV(audio->mixer_lock); |
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252 } |
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253 |
| 1794 | 254 static Uint16 SDL_ParseAudioFormat(const char *string) |
| 255 { | |
| 256 Uint16 format = 0; | |
| 257 | |
| 258 switch (*string) { | |
| 259 case 'U': | |
| 260 ++string; | |
| 261 format |= 0x0000; | |
| 262 break; | |
| 263 case 'S': | |
| 264 ++string; | |
| 265 format |= 0x8000; | |
| 266 break; | |
| 267 default: | |
| 268 return 0; | |
| 269 } | |
| 270 switch (SDL_atoi(string)) { | |
| 271 case 8: | |
| 272 string += 1; | |
| 273 format |= 8; | |
| 274 break; | |
| 275 case 16: | |
| 276 string += 2; | |
| 277 format |= 16; | |
| 278 if ( SDL_strcmp(string, "LSB") == 0 | |
| 279 #if SDL_BYTEORDER == SDL_LIL_ENDIAN | |
| 280 || SDL_strcmp(string, "SYS") == 0 | |
| 281 #endif | |
| 282 ) { | |
| 283 format |= 0x0000; | |
| 284 } | |
| 285 if ( SDL_strcmp(string, "MSB") == 0 | |
| 286 #if SDL_BYTEORDER == SDL_BIG_ENDIAN | |
| 287 || SDL_strcmp(string, "SYS") == 0 | |
| 288 #endif | |
| 289 ) { | |
| 290 format |= 0x1000; | |
| 291 } | |
| 292 break; | |
| 293 default: | |
| 294 return 0; | |
| 295 } | |
| 296 return format; | |
| 297 } | |
| 298 | |
| 0 | 299 int SDL_AudioInit(const char *driver_name) |
| 300 { | |
| 301 SDL_AudioDevice *audio; | |
| 302 int i = 0, idx; | |
| 303 | |
| 304 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 305 if ( current_audio != NULL ) { | |
| 306 SDL_AudioQuit(); | |
| 307 } | |
| 308 | |
| 309 /* Select the proper audio driver */ | |
| 310 audio = NULL; | |
| 311 idx = 0; | |
|
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312 #if SDL_AUDIO_DRIVER_ESD |
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313 if ( (driver_name == NULL) && (SDL_getenv("ESPEAKER") != NULL) ) { |
| 0 | 314 /* Ahem, we know that if ESPEAKER is set, user probably wants |
| 315 to use ESD, but don't start it if it's not already running. | |
| 316 This probably isn't the place to do this, but... Shh! :) | |
| 317 */ | |
| 318 for ( i=0; bootstrap[i]; ++i ) { | |
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319 if ( SDL_strcasecmp(bootstrap[i]->name, "esd") == 0 ) { |
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320 #ifdef HAVE_PUTENV |
| 0 | 321 const char *esd_no_spawn; |
| 322 | |
| 323 /* Don't start ESD if it's not running */ | |
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324 esd_no_spawn = getenv("ESD_NO_SPAWN"); |
| 0 | 325 if ( esd_no_spawn == NULL ) { |
| 326 putenv("ESD_NO_SPAWN=1"); | |
| 327 } | |
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328 #endif |
| 0 | 329 if ( bootstrap[i]->available() ) { |
| 330 audio = bootstrap[i]->create(0); | |
| 331 break; | |
| 332 } | |
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333 #ifdef HAVE_UNSETENV |
| 0 | 334 if ( esd_no_spawn == NULL ) { |
| 335 unsetenv("ESD_NO_SPAWN"); | |
| 336 } | |
| 337 #endif | |
| 338 } | |
| 339 } | |
| 340 } | |
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341 #endif /* SDL_AUDIO_DRIVER_ESD */ |
| 0 | 342 if ( audio == NULL ) { |
| 343 if ( driver_name != NULL ) { | |
| 344 #if 0 /* This will be replaced with a better driver selection API */ | |
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345 if ( SDL_strrchr(driver_name, ':') != NULL ) { |
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346 idx = atoi(SDL_strrchr(driver_name, ':')+1); |
| 0 | 347 } |
| 348 #endif | |
| 349 for ( i=0; bootstrap[i]; ++i ) { | |
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350 if (SDL_strcasecmp(bootstrap[i]->name, driver_name) == 0) { |
| 0 | 351 if ( bootstrap[i]->available() ) { |
| 352 audio=bootstrap[i]->create(idx); | |
| 353 break; | |
| 354 } | |
| 355 } | |
| 356 } | |
| 357 } else { | |
| 358 for ( i=0; bootstrap[i]; ++i ) { | |
| 359 if ( bootstrap[i]->available() ) { | |
| 360 audio = bootstrap[i]->create(idx); | |
| 361 if ( audio != NULL ) { | |
| 362 break; | |
| 363 } | |
| 364 } | |
| 365 } | |
| 366 } | |
| 367 if ( audio == NULL ) { | |
| 368 SDL_SetError("No available audio device"); | |
| 369 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 370 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 371 */ | |
| 372 return(-1); | |
| 373 #endif | |
| 374 } | |
| 375 } | |
| 376 current_audio = audio; | |
| 377 if ( current_audio ) { | |
| 378 current_audio->name = bootstrap[i]->name; | |
|
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379 if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
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380 current_audio->LockAudio = SDL_LockAudio_Default; |
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381 current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
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382 } |
| 0 | 383 } |
| 384 return(0); | |
| 385 } | |
| 386 | |
| 387 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 388 { | |
| 389 if ( current_audio != NULL ) { | |
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390 SDL_strlcpy(namebuf, current_audio->name, maxlen); |
| 0 | 391 return(namebuf); |
| 392 } | |
| 393 return(NULL); | |
| 394 } | |
| 395 | |
| 396 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 397 { | |
| 398 SDL_AudioDevice *audio; | |
| 1794 | 399 const char *env; |
| 0 | 400 |
| 401 /* Start up the audio driver, if necessary */ | |
| 402 if ( ! current_audio ) { | |
| 403 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 404 (current_audio == NULL) ) { | |
| 405 return(-1); | |
| 406 } | |
| 407 } | |
| 408 audio = current_audio; | |
| 409 | |
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410 if (audio->opened) { |
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411 SDL_SetError("Audio device is already opened"); |
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412 return(-1); |
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413 } |
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414 |
| 0 | 415 /* Verify some parameters */ |
| 1794 | 416 if ( desired->freq == 0 ) { |
| 417 env = SDL_getenv("SDL_AUDIO_FREQUENCY"); | |
| 418 if ( env ) { | |
| 419 desired->freq = SDL_atoi(env); | |
| 420 } | |
| 421 } | |
| 422 if ( desired->freq == 0 ) { | |
| 423 /* Pick some default audio frequency */ | |
| 424 desired->freq = 22050; | |
| 425 } | |
| 426 if ( desired->format == 0 ) { | |
| 427 env = SDL_getenv("SDL_AUDIO_FORMAT"); | |
| 428 if ( env ) { | |
| 429 desired->format = SDL_ParseAudioFormat(env); | |
| 430 } | |
| 431 } | |
| 432 if ( desired->format == 0 ) { | |
| 433 /* Pick some default audio format */ | |
| 434 desired->format = AUDIO_S16; | |
| 435 } | |
| 436 if ( desired->channels == 0 ) { | |
| 437 env = SDL_getenv("SDL_AUDIO_CHANNELS"); | |
| 438 if ( env ) { | |
| 439 desired->channels = SDL_atoi(env); | |
| 440 } | |
| 441 } | |
| 442 if ( desired->channels == 0 ) { | |
| 443 /* Pick a default number of channels */ | |
| 444 desired->channels = 2; | |
| 0 | 445 } |
| 446 switch ( desired->channels ) { | |
| 447 case 1: /* Mono */ | |
| 448 case 2: /* Stereo */ | |
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449 case 4: /* surround */ |
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450 case 6: /* surround with center and lfe */ |
| 0 | 451 break; |
| 452 default: | |
| 453 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 454 return(-1); | |
| 455 } | |
| 1794 | 456 if ( desired->samples == 0 ) { |
| 457 env = SDL_getenv("SDL_AUDIO_SAMPLES"); | |
| 458 if ( env ) { | |
| 459 desired->samples = SDL_atoi(env); | |
| 460 } | |
| 461 } | |
| 462 if ( desired->samples == 0 ) { | |
| 463 /* Pick a default of ~46 ms at desired frequency */ | |
| 464 int samples = (desired->freq / 1000) * 46; | |
| 465 int power2 = 1; | |
| 466 while ( power2 < samples ) { | |
| 467 power2 *= 2; | |
| 468 } | |
| 469 desired->samples = power2; | |
| 470 } | |
| 471 if ( desired->callback == NULL ) { | |
| 472 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 473 return(-1); | |
| 474 } | |
| 0 | 475 |
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476 #if SDL_THREADS_DISABLED |
|
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477 /* Uses interrupt driven audio, without thread */ |
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478 #else |
| 0 | 479 /* Create a semaphore for locking the sound buffers */ |
| 480 audio->mixer_lock = SDL_CreateMutex(); | |
| 481 if ( audio->mixer_lock == NULL ) { | |
| 482 SDL_SetError("Couldn't create mixer lock"); | |
| 483 SDL_CloseAudio(); | |
| 484 return(-1); | |
| 485 } | |
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486 #endif /* SDL_THREADS_DISABLED */ |
| 0 | 487 |
| 488 /* Calculate the silence and size of the audio specification */ | |
| 489 SDL_CalculateAudioSpec(desired); | |
| 490 | |
| 491 /* Open the audio subsystem */ | |
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492 SDL_memcpy(&audio->spec, desired, sizeof(audio->spec)); |
| 0 | 493 audio->convert.needed = 0; |
| 494 audio->enabled = 1; | |
| 495 audio->paused = 1; | |
|
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496 |
| 0 | 497 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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498 |
| 0 | 499 if ( ! audio->opened ) { |
| 500 SDL_CloseAudio(); | |
| 501 return(-1); | |
| 502 } | |
| 503 | |
| 504 /* If the audio driver changes the buffer size, accept it */ | |
| 505 if ( audio->spec.samples != desired->samples ) { | |
| 506 desired->samples = audio->spec.samples; | |
| 507 SDL_CalculateAudioSpec(desired); | |
| 508 } | |
| 509 | |
| 510 /* Allocate a fake audio memory buffer */ | |
| 511 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 512 if ( audio->fake_stream == NULL ) { | |
| 513 SDL_CloseAudio(); | |
| 514 SDL_OutOfMemory(); | |
| 515 return(-1); | |
| 516 } | |
| 517 | |
| 518 /* See if we need to do any conversion */ | |
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519 if ( obtained != NULL ) { |
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520 SDL_memcpy(obtained, &audio->spec, sizeof(audio->spec)); |
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521 } else if ( desired->freq != audio->spec.freq || |
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522 desired->format != audio->spec.format || |
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523 desired->channels != audio->spec.channels ) { |
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524 /* Build an audio conversion block */ |
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525 if ( SDL_BuildAudioCVT(&audio->convert, |
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526 desired->format, desired->channels, |
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527 desired->freq, |
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528 audio->spec.format, audio->spec.channels, |
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529 audio->spec.freq) < 0 ) { |
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530 SDL_CloseAudio(); |
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531 return(-1); |
| 0 | 532 } |
|
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533 if ( audio->convert.needed ) { |
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534 audio->convert.len = (int) ( ((double) desired->size) / |
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535 audio->convert.len_ratio ); |
|
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536 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( |
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537 audio->convert.len*audio->convert.len_mult); |
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538 if ( audio->convert.buf == NULL ) { |
| 0 | 539 SDL_CloseAudio(); |
|
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540 SDL_OutOfMemory(); |
| 0 | 541 return(-1); |
| 542 } | |
| 543 } | |
| 544 } | |
| 545 | |
| 546 /* Start the audio thread if necessary */ | |
| 547 switch (audio->opened) { | |
| 548 case 1: | |
| 549 /* Start the audio thread */ | |
| 3975 | 550 #if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC) && !defined(__SYMBIAN32__) |
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551 #undef SDL_CreateThread |
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552 audio->thread = SDL_CreateThread(SDL_RunAudio, audio, NULL, NULL); |
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553 #else |
| 0 | 554 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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555 #endif |
| 0 | 556 if ( audio->thread == NULL ) { |
| 557 SDL_CloseAudio(); | |
| 558 SDL_SetError("Couldn't create audio thread"); | |
| 559 return(-1); | |
| 560 } | |
| 561 break; | |
| 562 | |
| 563 default: | |
| 564 /* The audio is now playing */ | |
| 565 break; | |
| 566 } | |
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567 |
| 0 | 568 return(0); |
| 569 } | |
| 570 | |
| 571 SDL_audiostatus SDL_GetAudioStatus(void) | |
| 572 { | |
| 573 SDL_AudioDevice *audio = current_audio; | |
| 574 SDL_audiostatus status; | |
| 575 | |
| 576 status = SDL_AUDIO_STOPPED; | |
| 577 if ( audio && audio->enabled ) { | |
| 578 if ( audio->paused ) { | |
| 579 status = SDL_AUDIO_PAUSED; | |
| 580 } else { | |
| 581 status = SDL_AUDIO_PLAYING; | |
| 582 } | |
| 583 } | |
| 584 return(status); | |
| 585 } | |
| 586 | |
| 587 void SDL_PauseAudio (int pause_on) | |
| 588 { | |
| 589 SDL_AudioDevice *audio = current_audio; | |
| 590 | |
| 591 if ( audio ) { | |
| 592 audio->paused = pause_on; | |
| 593 } | |
| 594 } | |
| 595 | |
| 596 void SDL_LockAudio (void) | |
| 597 { | |
| 598 SDL_AudioDevice *audio = current_audio; | |
| 599 | |
| 600 /* Obtain a lock on the mixing buffers */ | |
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601 if ( audio && audio->LockAudio ) { |
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602 audio->LockAudio(audio); |
| 0 | 603 } |
| 604 } | |
| 605 | |
| 606 void SDL_UnlockAudio (void) | |
| 607 { | |
| 608 SDL_AudioDevice *audio = current_audio; | |
| 609 | |
| 610 /* Release lock on the mixing buffers */ | |
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611 if ( audio && audio->UnlockAudio ) { |
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612 audio->UnlockAudio(audio); |
| 0 | 613 } |
| 614 } | |
| 615 | |
| 616 void SDL_CloseAudio (void) | |
| 617 { | |
| 618 SDL_QuitSubSystem(SDL_INIT_AUDIO); | |
| 619 } | |
| 620 | |
| 621 void SDL_AudioQuit(void) | |
| 622 { | |
| 623 SDL_AudioDevice *audio = current_audio; | |
| 624 | |
| 625 if ( audio ) { | |
| 626 audio->enabled = 0; | |
| 627 if ( audio->thread != NULL ) { | |
| 628 SDL_WaitThread(audio->thread, NULL); | |
| 629 } | |
| 630 if ( audio->mixer_lock != NULL ) { | |
| 631 SDL_DestroyMutex(audio->mixer_lock); | |
| 632 } | |
| 633 if ( audio->fake_stream != NULL ) { | |
| 634 SDL_FreeAudioMem(audio->fake_stream); | |
| 635 } | |
| 636 if ( audio->convert.needed ) { | |
| 637 SDL_FreeAudioMem(audio->convert.buf); | |
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638 |
| 0 | 639 } |
| 640 if ( audio->opened ) { | |
| 641 audio->CloseAudio(audio); | |
| 642 audio->opened = 0; | |
| 643 } | |
| 644 /* Free the driver data */ | |
| 645 audio->free(audio); | |
| 646 current_audio = NULL; | |
| 647 } | |
| 648 } | |
| 649 | |
| 650 #define NUM_FORMATS 6 | |
| 651 static int format_idx; | |
| 652 static int format_idx_sub; | |
| 653 static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { | |
| 654 { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 655 { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 656 { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 657 { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 658 { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 659 { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 660 }; | |
| 661 | |
| 662 Uint16 SDL_FirstAudioFormat(Uint16 format) | |
| 663 { | |
| 664 for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { | |
| 665 if ( format_list[format_idx][0] == format ) { | |
| 666 break; | |
| 667 } | |
| 668 } | |
| 669 format_idx_sub = 0; | |
| 670 return(SDL_NextAudioFormat()); | |
| 671 } | |
| 672 | |
| 673 Uint16 SDL_NextAudioFormat(void) | |
| 674 { | |
| 675 if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { | |
| 676 return(0); | |
| 677 } | |
| 678 return(format_list[format_idx][format_idx_sub++]); | |
| 679 } | |
| 680 | |
| 681 void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) | |
| 682 { | |
| 683 switch (spec->format) { | |
| 684 case AUDIO_U8: | |
| 685 spec->silence = 0x80; | |
| 686 break; | |
| 687 default: | |
| 688 spec->silence = 0x00; | |
| 689 break; | |
| 690 } | |
| 691 spec->size = (spec->format&0xFF)/8; | |
| 692 spec->size *= spec->channels; | |
| 693 spec->size *= spec->samples; | |
| 694 } |