| 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997-2009 Sam Lantinga |
| 4 | |
| 5 | This library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 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 |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with this library; if not, write to the Free Software |
| 17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | |
| 19 | Sam Lantinga |
| 20 | slouken@libsdl.org |
| 21 | */ |
| 22 | #include "SDL_config.h" |
| 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 | |
| 31 | #ifdef __OS2__ |
| 32 | /* We'll need the DosSetPriority() API! */ |
| 33 | #define INCL_DOSPROCESS |
| 34 | #include <os2.h> |
| 35 | #endif |
| 36 | |
| 37 | /* Available audio drivers */ |
| 38 | static AudioBootStrap *bootstrap[] = { |
| 39 | #if SDL_AUDIO_DRIVER_BSD |
| 40 | &BSD_AUDIO_bootstrap, |
| 41 | #endif |
| 42 | #if SDL_AUDIO_DRIVER_PULSE |
| 43 | &PULSE_bootstrap, |
| 44 | #endif |
| 45 | #if SDL_AUDIO_DRIVER_ALSA |
| 46 | &ALSA_bootstrap, |
| 47 | #endif |
| 48 | #if SDL_AUDIO_DRIVER_OSS |
| 49 | &DSP_bootstrap, |
| 50 | &DMA_bootstrap, |
| 51 | #endif |
| 52 | #if SDL_AUDIO_DRIVER_QNXNTO |
| 53 | &QNXNTOAUDIO_bootstrap, |
| 54 | #endif |
| 55 | #if SDL_AUDIO_DRIVER_SUNAUDIO |
| 56 | &SUNAUDIO_bootstrap, |
| 57 | #endif |
| 58 | #if SDL_AUDIO_DRIVER_DMEDIA |
| 59 | &DMEDIA_bootstrap, |
| 60 | #endif |
| 61 | #if SDL_AUDIO_DRIVER_ARTS |
| 62 | &ARTS_bootstrap, |
| 63 | #endif |
| 64 | #if SDL_AUDIO_DRIVER_ESD |
| 65 | &ESD_bootstrap, |
| 66 | #endif |
| 67 | #if SDL_AUDIO_DRIVER_NAS |
| 68 | &NAS_bootstrap, |
| 69 | #endif |
| 70 | #if SDL_AUDIO_DRIVER_DSOUND |
| 71 | &DSOUND_bootstrap, |
| 72 | #endif |
| 73 | #if SDL_AUDIO_DRIVER_WAVEOUT |
| 74 | &WAVEOUT_bootstrap, |
| 75 | #endif |
| 76 | #if SDL_AUDIO_DRIVER_PAUD |
| 77 | &Paud_bootstrap, |
| 78 | #endif |
| 79 | #if SDL_AUDIO_DRIVER_BAUDIO |
| 80 | &BAUDIO_bootstrap, |
| 81 | #endif |
| 82 | #if SDL_AUDIO_DRIVER_COREAUDIO |
| 83 | &COREAUDIO_bootstrap, |
| 84 | #endif |
| 85 | #if SDL_AUDIO_DRIVER_SNDMGR |
| 86 | &SNDMGR_bootstrap, |
| 87 | #endif |
| 88 | #if SDL_AUDIO_DRIVER_MINT |
| 89 | &MINTAUDIO_GSXB_bootstrap, |
| 90 | &MINTAUDIO_MCSN_bootstrap, |
| 91 | &MINTAUDIO_STFA_bootstrap, |
| 92 | &MINTAUDIO_XBIOS_bootstrap, |
| 93 | &MINTAUDIO_DMA8_bootstrap, |
| 94 | #endif |
| 95 | #if SDL_AUDIO_DRIVER_DISK |
| 96 | &DISKAUD_bootstrap, |
| 97 | #endif |
| 98 | #if SDL_AUDIO_DRIVER_DUMMY |
| 99 | &DUMMYAUD_bootstrap, |
| 100 | #endif |
| 101 | #if SDL_AUDIO_DRIVER_DC |
| 102 | &DCAUD_bootstrap, |
| 103 | #endif |
| 104 | #if SDL_AUDIO_DRIVER_NDS |
| 105 | &NDSAUD_bootstrap, |
| 106 | #endif |
| 107 | #if SDL_AUDIO_DRIVER_MMEAUDIO |
| 108 | &MMEAUDIO_bootstrap, |
| 109 | #endif |
| 110 | #if SDL_AUDIO_DRIVER_DART |
| 111 | &DART_bootstrap, |
| 112 | #endif |
| 113 | #if SDL_AUDIO_DRIVER_EPOCAUDIO |
| 114 | &EPOCAudio_bootstrap, |
| 115 | #endif |
| 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 */ |
| 125 | int SDLCALL SDL_RunAudio(void *audiop) |
| 126 | { |
| 127 | SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; |
| 128 | Uint8 *stream; |
| 129 | int stream_len; |
| 130 | void *udata; |
| 131 | void (SDLCALL *fill)(void *userdata,Uint8 *stream, int len); |
| 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; |
| 143 | |
| 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 | } |
| 155 | |
| 156 | #ifdef __OS2__ |
| 157 | /* Increase the priority of this thread to make sure that |
| 158 | the audio will be continuous all the time! */ |
| 159 | #ifdef USE_DOSSETPRIORITY |
| 160 | if (SDL_getenv("SDL_USE_TIMECRITICAL_AUDIO")) |
| 161 | { |
| 162 | #ifdef DEBUG_BUILD |
| 163 | printf("[SDL_RunAudio] : Setting priority to TimeCritical+0! (TID%d)\n", SDL_ThreadID()); |
| 164 | #endif |
| 165 | DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0); |
| 166 | } |
| 167 | else |
| 168 | { |
| 169 | #ifdef DEBUG_BUILD |
| 170 | printf("[SDL_RunAudio] : Setting priority to ForegroundServer+0! (TID%d)\n", SDL_ThreadID()); |
| 171 | #endif |
| 172 | DosSetPriority(PRTYS_THREAD, PRTYC_FOREGROUNDSERVER, 0, 0); |
| 173 | } |
| 174 | #endif |
| 175 | #endif |
| 176 | |
| 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 | } |
| 193 | |
| 194 | SDL_memset(stream, silence, stream_len); |
| 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 | } |
| 209 | SDL_memcpy(stream, audio->convert.buf, |
| 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); |
| 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); |
| 223 | } |
| 224 | } |
| 225 | |
| 226 | /* Wait for the audio to drain.. */ |
| 227 | if ( audio->WaitDone ) { |
| 228 | audio->WaitDone(audio); |
| 229 | } |
| 230 | |
| 231 | #ifdef __OS2__ |
| 232 | #ifdef DEBUG_BUILD |
| 233 | printf("[SDL_RunAudio] : Task exiting. (TID%d)\n", SDL_ThreadID()); |
| 234 | #endif |
| 235 | #endif |
| 236 | return(0); |
| 237 | } |
| 238 | |
| 239 | static void SDL_LockAudio_Default(SDL_AudioDevice *audio) |
| 240 | { |
| 241 | if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
| 242 | return; |
| 243 | } |
| 244 | SDL_mutexP(audio->mixer_lock); |
| 245 | } |
| 246 | |
| 247 | static void SDL_UnlockAudio_Default(SDL_AudioDevice *audio) |
| 248 | { |
| 249 | if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
| 250 | return; |
| 251 | } |
| 252 | SDL_mutexV(audio->mixer_lock); |
| 253 | } |
| 254 | |
| 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 | |
| 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; |
| 313 | #if SDL_AUDIO_DRIVER_ESD |
| 314 | if ( (driver_name == NULL) && (SDL_getenv("ESPEAKER") != NULL) ) { |
| 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 ) { |
| 320 | if ( SDL_strcasecmp(bootstrap[i]->name, "esd") == 0 ) { |
| 321 | #ifdef HAVE_PUTENV |
| 322 | const char *esd_no_spawn; |
| 323 | |
| 324 | /* Don't start ESD if it's not running */ |
| 325 | esd_no_spawn = getenv("ESD_NO_SPAWN"); |
| 326 | if ( esd_no_spawn == NULL ) { |
| 327 | putenv("ESD_NO_SPAWN=1"); |
| 328 | } |
| 329 | #endif |
| 330 | if ( bootstrap[i]->available() ) { |
| 331 | audio = bootstrap[i]->create(0); |
| 332 | break; |
| 333 | } |
| 334 | #ifdef HAVE_UNSETENV |
| 335 | if ( esd_no_spawn == NULL ) { |
| 336 | unsetenv("ESD_NO_SPAWN"); |
| 337 | } |
| 338 | #endif |
| 339 | } |
| 340 | } |
| 341 | } |
| 342 | #endif /* SDL_AUDIO_DRIVER_ESD */ |
| 343 | if ( audio == NULL ) { |
| 344 | if ( driver_name != NULL ) { |
| 345 | #if 0 /* This will be replaced with a better driver selection API */ |
| 346 | if ( SDL_strrchr(driver_name, ':') != NULL ) { |
| 347 | idx = atoi(SDL_strrchr(driver_name, ':')+1); |
| 348 | } |
| 349 | #endif |
| 350 | for ( i=0; bootstrap[i]; ++i ) { |
| 351 | if (SDL_strcasecmp(bootstrap[i]->name, driver_name) == 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; |
| 380 | if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
| 381 | current_audio->LockAudio = SDL_LockAudio_Default; |
| 382 | current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
| 383 | } |
| 384 | } |
| 385 | return(0); |
| 386 | } |
| 387 | |
| 388 | char *SDL_AudioDriverName(char *namebuf, int maxlen) |
| 389 | { |
| 390 | if ( current_audio != NULL ) { |
| 391 | SDL_strlcpy(namebuf, current_audio->name, maxlen); |
| 392 | return(namebuf); |
| 393 | } |
| 394 | return(NULL); |
| 395 | } |
| 396 | |
| 397 | int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) |
| 398 | { |
| 399 | SDL_AudioDevice *audio; |
| 400 | const char *env; |
| 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 | |
| 411 | if (audio->opened) { |
| 412 | SDL_SetError("Audio device is already opened"); |
| 413 | return(-1); |
| 414 | } |
| 415 | |
| 416 | /* Verify some parameters */ |
| 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 ) { |
| 440 | desired->channels = (Uint8)SDL_atoi(env); |
| 441 | } |
| 442 | } |
| 443 | if ( desired->channels == 0 ) { |
| 444 | /* Pick a default number of channels */ |
| 445 | desired->channels = 2; |
| 446 | } |
| 447 | switch ( desired->channels ) { |
| 448 | case 1: /* Mono */ |
| 449 | case 2: /* Stereo */ |
| 450 | case 4: /* surround */ |
| 451 | case 6: /* surround with center and lfe */ |
| 452 | break; |
| 453 | default: |
| 454 | SDL_SetError("1 (mono) and 2 (stereo) channels supported"); |
| 455 | return(-1); |
| 456 | } |
| 457 | if ( desired->samples == 0 ) { |
| 458 | env = SDL_getenv("SDL_AUDIO_SAMPLES"); |
| 459 | if ( env ) { |
| 460 | desired->samples = (Uint16)SDL_atoi(env); |
| 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 | } |
| 476 | |
| 477 | #if SDL_THREADS_DISABLED |
| 478 | /* Uses interrupt driven audio, without thread */ |
| 479 | #else |
| 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 | } |
| 487 | #endif /* SDL_THREADS_DISABLED */ |
| 488 | |
| 489 | /* Calculate the silence and size of the audio specification */ |
| 490 | SDL_CalculateAudioSpec(desired); |
| 491 | |
| 492 | /* Open the audio subsystem */ |
| 493 | SDL_memcpy(&audio->spec, desired, sizeof(audio->spec)); |
| 494 | audio->convert.needed = 0; |
| 495 | audio->enabled = 1; |
| 496 | audio->paused = 1; |
| 497 | |
| 498 | audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
| 499 | |
| 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 */ |
| 520 | if ( obtained != NULL ) { |
| 521 | SDL_memcpy(obtained, &audio->spec, sizeof(audio->spec)); |
| 522 | } else if ( desired->freq != audio->spec.freq || |
| 523 | desired->format != audio->spec.format || |
| 524 | desired->channels != audio->spec.channels ) { |
| 525 | /* Build an audio conversion block */ |
| 526 | if ( SDL_BuildAudioCVT(&audio->convert, |
| 527 | desired->format, desired->channels, |
| 528 | desired->freq, |
| 529 | audio->spec.format, audio->spec.channels, |
| 530 | audio->spec.freq) < 0 ) { |
| 531 | SDL_CloseAudio(); |
| 532 | return(-1); |
| 533 | } |
| 534 | if ( audio->convert.needed ) { |
| 535 | audio->convert.len = (int) ( ((double) audio->spec.size) / |
| 536 | audio->convert.len_ratio ); |
| 537 | audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( |
| 538 | audio->convert.len*audio->convert.len_mult); |
| 539 | if ( audio->convert.buf == NULL ) { |
| 540 | SDL_CloseAudio(); |
| 541 | SDL_OutOfMemory(); |
| 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 */ |
| 551 | #if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC) && !defined(__SYMBIAN32__) |
| 552 | #undef SDL_CreateThread |
| 553 | audio->thread = SDL_CreateThread(SDL_RunAudio, audio, NULL, NULL); |
| 554 | #else |
| 555 | audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
| 556 | #endif |
| 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 | } |
| 568 | |
| 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 */ |
| 602 | if ( audio && audio->LockAudio ) { |
| 603 | audio->LockAudio(audio); |
| 604 | } |
| 605 | } |
| 606 | |
| 607 | void SDL_UnlockAudio (void) |
| 608 | { |
| 609 | SDL_AudioDevice *audio = current_audio; |
| 610 | |
| 611 | /* Release lock on the mixing buffers */ |
| 612 | if ( audio && audio->UnlockAudio ) { |
| 613 | audio->UnlockAudio(audio); |
| 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); |
| 639 | |
| 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 | } |