Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 21:75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
| author | Sam Lantinga <slouken@lokigames.com> |
|---|---|
| date | Thu, 10 May 2001 20:13:29 +0000 |
| parents | 74212992fb08 |
| children | d3bc792e136d |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga | |
| 4 | |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 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 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
| 20 slouken@devolution.com | |
| 21 */ | |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* Allow access to a raw mixing buffer */ | |
| 29 #include <stdlib.h> | |
| 30 #include <stdio.h> | |
| 31 #include <string.h> | |
| 32 | |
| 33 #include "SDL.h" | |
| 34 #include "SDL_audio.h" | |
| 35 #include "SDL_timer.h" | |
| 36 #include "SDL_error.h" | |
| 37 #include "SDL_audio_c.h" | |
| 38 #include "SDL_audiomem.h" | |
| 39 #include "SDL_sysaudio.h" | |
| 40 | |
| 41 /* Available audio drivers */ | |
| 42 static AudioBootStrap *bootstrap[] = { | |
| 43 #if defined(unix) && \ | |
| 44 !defined(linux) && !defined(__FreeBSD__) && !defined(__CYGWIN32__) \ | |
| 45 && !defined(__bsdi__) | |
| 46 &AUDIO_bootstrap, | |
| 47 #endif | |
| 48 #ifdef OSS_SUPPORT | |
| 49 &DSP_bootstrap, | |
| 50 &DMA_bootstrap, | |
| 51 #endif | |
| 52 #ifdef ALSA_SUPPORT | |
| 53 &ALSA_bootstrap, | |
| 54 #endif | |
| 55 #ifdef ARTSC_SUPPORT | |
| 56 &ARTSC_bootstrap, | |
| 57 #endif | |
| 58 #ifdef ESD_SUPPORT | |
| 59 &ESD_bootstrap, | |
| 60 #endif | |
| 61 #ifdef NAS_SUPPORT | |
| 62 &NAS_bootstrap, | |
| 63 #endif | |
| 64 #ifdef ENABLE_DIRECTX | |
| 65 &DSOUND_bootstrap, | |
| 66 #endif | |
| 67 #ifdef ENABLE_WINDIB | |
| 68 &WAVEOUT_bootstrap, | |
| 69 #endif | |
| 70 #ifdef __BEOS__ | |
| 71 &BAUDIO_bootstrap, | |
| 72 #endif | |
| 73 #if defined(macintosh) || TARGET_API_MAC_CARBON | |
| 74 &SNDMGR_bootstrap, | |
| 75 #endif | |
| 76 #ifdef _AIX | |
| 77 &Paud_bootstrap, | |
| 78 #endif | |
|
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79 #ifdef ENABLE_AHI |
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80 &AHI_bootstrap, |
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81 #endif |
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82 |
| 0 | 83 NULL |
| 84 }; | |
| 85 SDL_AudioDevice *current_audio = NULL; | |
| 86 | |
| 87 /* Various local functions */ | |
| 88 int SDL_AudioInit(const char *driver_name); | |
| 89 void SDL_AudioQuit(void); | |
| 90 | |
|
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91 #ifdef ENABLE_AHI |
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92 static int audio_configured = 0; |
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93 #endif |
| 0 | 94 |
| 95 /* The general mixing thread function */ | |
| 96 int SDL_RunAudio(void *audiop) | |
| 97 { | |
| 98 SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; | |
| 99 Uint8 *stream; | |
| 100 int stream_len; | |
| 101 void *udata; | |
| 102 void (*fill)(void *userdata,Uint8 *stream, int len); | |
| 103 int silence; | |
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104 #ifdef ENABLE_AHI |
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105 int started = 0; |
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106 |
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107 /* AmigaOS NEEDS that the audio driver is opened in the thread that uses it! */ |
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108 |
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109 D(bug("Task audio started audio struct:<%lx>...\n",audiop)); |
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110 |
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111 D(bug("Before Openaudio...")); |
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112 if(audio->OpenAudio(audio, &audio->spec)==-1) |
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113 { |
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114 D(bug("Open audio failed...\n")); |
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115 return(-1); |
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116 } |
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117 D(bug("OpenAudio...OK\n")); |
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118 #endif |
| 0 | 119 |
| 120 /* Perform any thread setup */ | |
| 121 if ( audio->ThreadInit ) { | |
| 122 audio->ThreadInit(audio); | |
| 123 } | |
| 124 audio->threadid = SDL_ThreadID(); | |
| 125 | |
| 126 /* Set up the mixing function */ | |
| 127 fill = audio->spec.callback; | |
| 128 udata = audio->spec.userdata; | |
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129 |
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130 #ifdef ENABLE_AHI |
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131 audio_configured = 1; |
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132 |
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133 D(bug("Audio configured... Checking for conversion\n")); |
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134 SDL_mutexP(audio->mixer_lock); |
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135 D(bug("Semaphore obtained...\n")); |
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136 #endif |
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137 |
| 0 | 138 if ( audio->convert.needed ) { |
| 139 if ( audio->convert.src_format == AUDIO_U8 ) { | |
| 140 silence = 0x80; | |
| 141 } else { | |
| 142 silence = 0; | |
| 143 } | |
| 144 stream_len = audio->convert.len; | |
| 145 } else { | |
| 146 silence = audio->spec.silence; | |
| 147 stream_len = audio->spec.size; | |
| 148 } | |
| 149 stream = audio->fake_stream; | |
| 150 | |
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151 #ifdef ENABLE_AHI |
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152 SDL_mutexV(audio->mixer_lock); |
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153 D(bug("Entering audio loop...\n")); |
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154 #endif |
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155 |
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156 |
| 0 | 157 /* Loop, filling the audio buffers */ |
| 158 while ( audio->enabled ) { | |
| 159 | |
| 160 /* Wait for new current buffer to finish playing */ | |
| 161 if ( stream == audio->fake_stream ) { | |
| 162 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); | |
| 163 } else { | |
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164 #ifdef ENABLE_AHI |
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165 if ( started > 1 ) |
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166 #endif |
| 0 | 167 audio->WaitAudio(audio); |
| 168 } | |
| 169 | |
| 170 /* Fill the current buffer with sound */ | |
| 171 if ( audio->convert.needed ) { | |
| 172 if ( audio->convert.buf ) { | |
| 173 stream = audio->convert.buf; | |
| 174 } else { | |
| 175 continue; | |
| 176 } | |
| 177 } else { | |
| 178 stream = audio->GetAudioBuf(audio); | |
| 179 if ( stream == NULL ) { | |
| 180 stream = audio->fake_stream; | |
| 181 } | |
| 182 } | |
| 183 memset(stream, silence, stream_len); | |
| 184 | |
| 185 if ( ! audio->paused ) { | |
| 186 SDL_mutexP(audio->mixer_lock); | |
| 187 (*fill)(udata, stream, stream_len); | |
| 188 SDL_mutexV(audio->mixer_lock); | |
| 189 } | |
| 190 | |
| 191 /* Convert the audio if necessary */ | |
| 192 if ( audio->convert.needed ) { | |
| 193 SDL_ConvertAudio(&audio->convert); | |
| 194 stream = audio->GetAudioBuf(audio); | |
| 195 if ( stream == NULL ) { | |
| 196 stream = audio->fake_stream; | |
| 197 } | |
| 198 memcpy(stream, audio->convert.buf, | |
| 199 audio->convert.len_cvt); | |
| 200 } | |
| 201 | |
| 202 /* Ready current buffer for play and change current buffer */ | |
| 203 if ( stream != audio->fake_stream ) { | |
| 204 audio->PlayAudio(audio); | |
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205 #ifdef ENABLE_AHI |
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206 /* AmigaOS don't have to wait the first time audio is played! */ |
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207 started++; |
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208 #endif |
| 0 | 209 } |
| 210 } | |
| 211 /* Wait for the audio to drain.. */ | |
| 212 if ( audio->WaitDone ) { | |
| 213 audio->WaitDone(audio); | |
| 214 } | |
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215 |
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216 #ifdef ENABLE_AHI |
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217 D(bug("WaitAudio...Done\n")); |
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218 |
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219 audio->CloseAudio(audio); |
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220 |
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221 D(bug("CloseAudio..Done, subtask exiting...\n")); |
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222 audio_configured = 0; |
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223 #endif |
| 0 | 224 return(0); |
| 225 } | |
| 226 | |
| 227 int SDL_AudioInit(const char *driver_name) | |
| 228 { | |
| 229 SDL_AudioDevice *audio; | |
| 230 int i = 0, idx; | |
| 231 | |
| 232 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 233 if ( current_audio != NULL ) { | |
| 234 SDL_AudioQuit(); | |
| 235 } | |
| 236 | |
| 237 /* Select the proper audio driver */ | |
| 238 audio = NULL; | |
| 239 idx = 0; | |
| 240 #ifdef unix | |
| 241 if ( (driver_name == NULL) && (getenv("ESPEAKER") != NULL) ) { | |
| 242 /* Ahem, we know that if ESPEAKER is set, user probably wants | |
| 243 to use ESD, but don't start it if it's not already running. | |
| 244 This probably isn't the place to do this, but... Shh! :) | |
| 245 */ | |
| 246 for ( i=0; bootstrap[i]; ++i ) { | |
| 247 if ( strcmp(bootstrap[i]->name, "esd") == 0 ) { | |
| 248 const char *esd_no_spawn; | |
| 249 | |
| 250 /* Don't start ESD if it's not running */ | |
| 251 esd_no_spawn = getenv("ESD_NO_SPAWN"); | |
| 252 if ( esd_no_spawn == NULL ) { | |
| 253 putenv("ESD_NO_SPAWN=1"); | |
| 254 } | |
| 255 if ( bootstrap[i]->available() ) { | |
| 256 audio = bootstrap[i]->create(0); | |
| 257 break; | |
| 258 } | |
| 259 #ifdef linux /* No unsetenv() on most platforms */ | |
| 260 if ( esd_no_spawn == NULL ) { | |
| 261 unsetenv("ESD_NO_SPAWN"); | |
| 262 } | |
| 263 #endif | |
| 264 } | |
| 265 } | |
| 266 } | |
| 267 #endif /* unix */ | |
| 268 if ( audio == NULL ) { | |
| 269 if ( driver_name != NULL ) { | |
| 270 #if 0 /* This will be replaced with a better driver selection API */ | |
| 271 if ( strrchr(driver_name, ':') != NULL ) { | |
| 272 idx = atoi(strrchr(driver_name, ':')+1); | |
| 273 } | |
| 274 #endif | |
| 275 for ( i=0; bootstrap[i]; ++i ) { | |
| 276 if (strncmp(bootstrap[i]->name, driver_name, | |
| 277 strlen(bootstrap[i]->name)) == 0) { | |
| 278 if ( bootstrap[i]->available() ) { | |
| 279 audio=bootstrap[i]->create(idx); | |
| 280 break; | |
| 281 } | |
| 282 } | |
| 283 } | |
| 284 } else { | |
| 285 for ( i=0; bootstrap[i]; ++i ) { | |
| 286 if ( bootstrap[i]->available() ) { | |
| 287 audio = bootstrap[i]->create(idx); | |
| 288 if ( audio != NULL ) { | |
| 289 break; | |
| 290 } | |
| 291 } | |
| 292 } | |
| 293 } | |
| 294 if ( audio == NULL ) { | |
| 295 SDL_SetError("No available audio device"); | |
| 296 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 297 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 298 */ | |
| 299 return(-1); | |
| 300 #endif | |
| 301 } | |
| 302 } | |
| 303 current_audio = audio; | |
| 304 if ( current_audio ) { | |
| 305 current_audio->name = bootstrap[i]->name; | |
| 306 } | |
| 307 return(0); | |
| 308 } | |
| 309 | |
| 310 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 311 { | |
| 312 if ( current_audio != NULL ) { | |
| 313 strncpy(namebuf, current_audio->name, maxlen-1); | |
| 314 namebuf[maxlen-1] = '\0'; | |
| 315 return(namebuf); | |
| 316 } | |
| 317 return(NULL); | |
| 318 } | |
| 319 | |
| 320 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 321 { | |
| 322 SDL_AudioDevice *audio; | |
| 323 | |
| 324 /* Start up the audio driver, if necessary */ | |
| 325 if ( ! current_audio ) { | |
| 326 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 327 (current_audio == NULL) ) { | |
| 328 return(-1); | |
| 329 } | |
| 330 } | |
| 331 audio = current_audio; | |
| 332 | |
| 333 /* Verify some parameters */ | |
| 334 if ( desired->callback == NULL ) { | |
| 335 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 336 return(-1); | |
| 337 } | |
| 338 switch ( desired->channels ) { | |
| 339 case 1: /* Mono */ | |
| 340 case 2: /* Stereo */ | |
| 341 break; | |
| 342 default: | |
| 343 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 344 return(-1); | |
| 345 } | |
| 346 | |
| 347 #ifdef macintosh | |
| 348 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ | |
| 349 #else | |
| 350 /* Create a semaphore for locking the sound buffers */ | |
| 351 audio->mixer_lock = SDL_CreateMutex(); | |
| 352 if ( audio->mixer_lock == NULL ) { | |
| 353 SDL_SetError("Couldn't create mixer lock"); | |
| 354 SDL_CloseAudio(); | |
| 355 return(-1); | |
| 356 } | |
| 357 #endif | |
| 358 | |
| 359 /* Calculate the silence and size of the audio specification */ | |
| 360 SDL_CalculateAudioSpec(desired); | |
| 361 | |
| 362 /* Open the audio subsystem */ | |
| 363 memcpy(&audio->spec, desired, sizeof(audio->spec)); | |
| 364 audio->convert.needed = 0; | |
| 365 audio->enabled = 1; | |
| 366 audio->paused = 1; | |
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367 |
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368 #ifndef ENABLE_AHI |
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369 |
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370 /* AmigaOS opens audio inside the main loop */ |
| 0 | 371 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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372 |
| 0 | 373 if ( ! audio->opened ) { |
| 374 SDL_CloseAudio(); | |
| 375 return(-1); | |
| 376 } | |
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377 #else |
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378 D(bug("Locking semaphore...")); |
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379 SDL_mutexP(audio->mixer_lock); |
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380 |
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381 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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382 D(bug("Created thread...\n")); |
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383 |
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384 if ( audio->thread == NULL ) { |
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385 SDL_mutexV(audio->mixer_lock); |
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386 SDL_CloseAudio(); |
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387 SDL_SetError("Couldn't create audio thread"); |
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388 return(-1); |
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389 } |
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390 |
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391 while(!audio_configured) |
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392 SDL_Delay(100); |
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393 #endif |
| 0 | 394 |
| 395 /* If the audio driver changes the buffer size, accept it */ | |
| 396 if ( audio->spec.samples != desired->samples ) { | |
| 397 desired->samples = audio->spec.samples; | |
| 398 SDL_CalculateAudioSpec(desired); | |
| 399 } | |
| 400 | |
| 401 /* Allocate a fake audio memory buffer */ | |
| 402 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 403 if ( audio->fake_stream == NULL ) { | |
| 404 SDL_CloseAudio(); | |
| 405 SDL_OutOfMemory(); | |
| 406 return(-1); | |
| 407 } | |
| 408 | |
| 409 /* See if we need to do any conversion */ | |
| 410 if ( memcmp(desired, &audio->spec, sizeof(audio->spec)) == 0 ) { | |
| 411 /* Just copy over the desired audio specification */ | |
| 412 if ( obtained != NULL ) { | |
| 413 memcpy(obtained, &audio->spec, sizeof(audio->spec)); | |
| 414 } | |
| 415 } else { | |
| 416 /* Copy over the audio specification if possible */ | |
| 417 if ( obtained != NULL ) { | |
| 418 memcpy(obtained, &audio->spec, sizeof(audio->spec)); | |
| 419 } else { | |
| 420 /* Build an audio conversion block */ | |
| 421 if ( SDL_BuildAudioCVT(&audio->convert, | |
| 422 desired->format, desired->channels, | |
| 423 desired->freq, | |
| 424 audio->spec.format, audio->spec.channels, | |
| 425 audio->spec.freq) < 0 ) { | |
| 426 SDL_CloseAudio(); | |
| 427 return(-1); | |
| 428 } | |
| 429 if ( audio->convert.needed ) { | |
| 430 audio->convert.len = desired->size; | |
| 431 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( | |
| 432 audio->convert.len*audio->convert.len_mult); | |
| 433 if ( audio->convert.buf == NULL ) { | |
| 434 SDL_CloseAudio(); | |
| 435 SDL_OutOfMemory(); | |
| 436 return(-1); | |
| 437 } | |
| 438 } | |
| 439 } | |
| 440 } | |
| 441 | |
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442 #ifndef ENABLE_AHI |
| 0 | 443 /* Start the audio thread if necessary */ |
| 444 switch (audio->opened) { | |
| 445 case 1: | |
| 446 /* Start the audio thread */ | |
| 447 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); | |
| 448 if ( audio->thread == NULL ) { | |
| 449 SDL_CloseAudio(); | |
| 450 SDL_SetError("Couldn't create audio thread"); | |
| 451 return(-1); | |
| 452 } | |
| 453 break; | |
| 454 | |
| 455 default: | |
| 456 /* The audio is now playing */ | |
| 457 break; | |
| 458 } | |
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459 #else |
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460 SDL_mutexV(audio->mixer_lock); |
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461 D(bug("SDL_OpenAudio USCITA...\n")); |
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462 |
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463 #endif |
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464 |
| 0 | 465 return(0); |
| 466 } | |
| 467 | |
| 468 SDL_audiostatus SDL_GetAudioStatus(void) | |
| 469 { | |
| 470 SDL_AudioDevice *audio = current_audio; | |
| 471 SDL_audiostatus status; | |
| 472 | |
| 473 status = SDL_AUDIO_STOPPED; | |
| 474 if ( audio && audio->enabled ) { | |
| 475 if ( audio->paused ) { | |
| 476 status = SDL_AUDIO_PAUSED; | |
| 477 } else { | |
| 478 status = SDL_AUDIO_PLAYING; | |
| 479 } | |
| 480 } | |
| 481 return(status); | |
| 482 } | |
| 483 | |
| 484 void SDL_PauseAudio (int pause_on) | |
| 485 { | |
| 486 SDL_AudioDevice *audio = current_audio; | |
| 487 | |
| 488 if ( audio ) { | |
| 489 audio->paused = pause_on; | |
| 490 } | |
| 491 } | |
| 492 | |
| 493 void SDL_LockAudio (void) | |
| 494 { | |
| 495 SDL_AudioDevice *audio = current_audio; | |
| 496 | |
| 497 /* Obtain a lock on the mixing buffers */ | |
| 498 if ( audio ) { | |
| 499 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { | |
| 500 return; | |
| 501 } | |
| 502 SDL_mutexP(audio->mixer_lock); | |
| 503 } | |
| 504 } | |
| 505 | |
| 506 void SDL_UnlockAudio (void) | |
| 507 { | |
| 508 SDL_AudioDevice *audio = current_audio; | |
| 509 | |
| 510 /* Release lock on the mixing buffers */ | |
| 511 if ( audio ) { | |
| 512 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { | |
| 513 return; | |
| 514 } | |
| 515 SDL_mutexV(audio->mixer_lock); | |
| 516 } | |
| 517 } | |
| 518 | |
| 519 void SDL_CloseAudio (void) | |
| 520 { | |
| 521 SDL_QuitSubSystem(SDL_INIT_AUDIO); | |
| 522 } | |
| 523 | |
| 524 void SDL_AudioQuit(void) | |
| 525 { | |
| 526 SDL_AudioDevice *audio = current_audio; | |
| 527 | |
| 528 if ( audio ) { | |
| 529 audio->enabled = 0; | |
| 530 if ( audio->thread != NULL ) { | |
| 531 SDL_WaitThread(audio->thread, NULL); | |
| 532 } | |
| 533 if ( audio->mixer_lock != NULL ) { | |
| 534 SDL_DestroyMutex(audio->mixer_lock); | |
| 535 } | |
| 536 if ( audio->fake_stream != NULL ) { | |
| 537 SDL_FreeAudioMem(audio->fake_stream); | |
| 538 } | |
| 539 if ( audio->convert.needed ) { | |
| 540 SDL_FreeAudioMem(audio->convert.buf); | |
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541 |
| 0 | 542 } |
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543 #ifndef ENABLE_AHI |
| 0 | 544 if ( audio->opened ) { |
| 545 audio->CloseAudio(audio); | |
| 546 audio->opened = 0; | |
| 547 } | |
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548 #endif |
| 0 | 549 /* Free the driver data */ |
| 550 audio->free(audio); | |
| 551 current_audio = NULL; | |
| 552 } | |
| 553 } | |
| 554 | |
| 555 #define NUM_FORMATS 6 | |
| 556 static int format_idx; | |
| 557 static int format_idx_sub; | |
| 558 static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { | |
| 559 { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 560 { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 561 { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 562 { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 563 { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 564 { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 565 }; | |
| 566 | |
| 567 Uint16 SDL_FirstAudioFormat(Uint16 format) | |
| 568 { | |
| 569 for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { | |
| 570 if ( format_list[format_idx][0] == format ) { | |
| 571 break; | |
| 572 } | |
| 573 } | |
| 574 format_idx_sub = 0; | |
| 575 return(SDL_NextAudioFormat()); | |
| 576 } | |
| 577 | |
| 578 Uint16 SDL_NextAudioFormat(void) | |
| 579 { | |
| 580 if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { | |
| 581 return(0); | |
| 582 } | |
| 583 return(format_list[format_idx][format_idx_sub++]); | |
| 584 } | |
| 585 | |
| 586 void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) | |
| 587 { | |
| 588 switch (spec->format) { | |
| 589 case AUDIO_U8: | |
| 590 spec->silence = 0x80; | |
| 591 break; | |
| 592 default: | |
| 593 spec->silence = 0x00; | |
| 594 break; | |
| 595 } | |
| 596 spec->size = (spec->format&0xFF)/8; | |
| 597 spec->size *= spec->channels; | |
| 598 spec->size *= spec->samples; | |
| 599 } |