Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 42:eb1459f3a3ae
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| author | Sam Lantinga <slouken@lokigames.com> |
|---|---|
| date | Sun, 27 May 2001 00:38:26 +0000 |
| parents | 80139f9b90d8 |
| children | ac6645260d31 |
| 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 #ifdef OSS_SUPPORT | |
| 44 &DSP_bootstrap, | |
| 45 &DMA_bootstrap, | |
| 46 #endif | |
| 47 #ifdef ALSA_SUPPORT | |
| 48 &ALSA_bootstrap, | |
| 49 #endif | |
|
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50 #ifdef __OpenBSD__ |
| 38 | 51 &OBSD_bootstrap, |
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52 #endif |
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53 #if (defined(unix) && !defined(__CYGWIN32__)) && \ |
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54 !defined(OSS_SUPPORT) && !defined(ALSA_SUPPORT) |
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55 &AUDIO_bootstrap, |
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56 #endif |
| 0 | 57 #ifdef ARTSC_SUPPORT |
| 58 &ARTSC_bootstrap, | |
| 59 #endif | |
| 60 #ifdef ESD_SUPPORT | |
| 61 &ESD_bootstrap, | |
| 62 #endif | |
| 63 #ifdef NAS_SUPPORT | |
| 64 &NAS_bootstrap, | |
| 65 #endif | |
| 66 #ifdef ENABLE_DIRECTX | |
| 67 &DSOUND_bootstrap, | |
| 68 #endif | |
| 69 #ifdef ENABLE_WINDIB | |
| 70 &WAVEOUT_bootstrap, | |
| 71 #endif | |
| 72 #ifdef __BEOS__ | |
| 73 &BAUDIO_bootstrap, | |
| 74 #endif | |
| 75 #if defined(macintosh) || TARGET_API_MAC_CARBON | |
| 76 &SNDMGR_bootstrap, | |
| 77 #endif | |
| 78 #ifdef _AIX | |
| 79 &Paud_bootstrap, | |
| 80 #endif | |
|
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81 #ifdef ENABLE_AHI |
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82 &AHI_bootstrap, |
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83 #endif |
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84 |
| 0 | 85 NULL |
| 86 }; | |
| 87 SDL_AudioDevice *current_audio = NULL; | |
| 88 | |
| 89 /* Various local functions */ | |
| 90 int SDL_AudioInit(const char *driver_name); | |
| 91 void SDL_AudioQuit(void); | |
| 92 | |
|
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93 #ifdef ENABLE_AHI |
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94 static int audio_configured = 0; |
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95 #endif |
| 0 | 96 |
| 97 /* The general mixing thread function */ | |
| 98 int SDL_RunAudio(void *audiop) | |
| 99 { | |
| 100 SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; | |
| 101 Uint8 *stream; | |
| 102 int stream_len; | |
| 103 void *udata; | |
| 104 void (*fill)(void *userdata,Uint8 *stream, int len); | |
| 105 int silence; | |
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106 #ifdef ENABLE_AHI |
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107 int started = 0; |
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108 |
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109 /* AmigaOS NEEDS that the audio driver is opened in the thread that uses it! */ |
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110 |
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111 D(bug("Task audio started audio struct:<%lx>...\n",audiop)); |
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112 |
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113 D(bug("Before Openaudio...")); |
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114 if(audio->OpenAudio(audio, &audio->spec)==-1) |
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115 { |
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116 D(bug("Open audio failed...\n")); |
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117 return(-1); |
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118 } |
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119 D(bug("OpenAudio...OK\n")); |
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120 #endif |
| 0 | 121 |
| 122 /* Perform any thread setup */ | |
| 123 if ( audio->ThreadInit ) { | |
| 124 audio->ThreadInit(audio); | |
| 125 } | |
| 126 audio->threadid = SDL_ThreadID(); | |
| 127 | |
| 128 /* Set up the mixing function */ | |
| 129 fill = audio->spec.callback; | |
| 130 udata = audio->spec.userdata; | |
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131 |
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132 #ifdef ENABLE_AHI |
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133 audio_configured = 1; |
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134 |
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135 D(bug("Audio configured... Checking for conversion\n")); |
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136 SDL_mutexP(audio->mixer_lock); |
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137 D(bug("Semaphore obtained...\n")); |
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138 #endif |
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139 |
| 0 | 140 if ( audio->convert.needed ) { |
| 141 if ( audio->convert.src_format == AUDIO_U8 ) { | |
| 142 silence = 0x80; | |
| 143 } else { | |
| 144 silence = 0; | |
| 145 } | |
| 146 stream_len = audio->convert.len; | |
| 147 } else { | |
| 148 silence = audio->spec.silence; | |
| 149 stream_len = audio->spec.size; | |
| 150 } | |
| 151 stream = audio->fake_stream; | |
| 152 | |
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153 #ifdef ENABLE_AHI |
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154 SDL_mutexV(audio->mixer_lock); |
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155 D(bug("Entering audio loop...\n")); |
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156 #endif |
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157 |
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158 |
| 0 | 159 /* Loop, filling the audio buffers */ |
| 160 while ( audio->enabled ) { | |
| 161 | |
| 162 /* Wait for new current buffer to finish playing */ | |
| 163 if ( stream == audio->fake_stream ) { | |
| 164 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); | |
| 165 } else { | |
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166 #ifdef ENABLE_AHI |
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167 if ( started > 1 ) |
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168 #endif |
| 0 | 169 audio->WaitAudio(audio); |
| 170 } | |
| 171 | |
| 172 /* Fill the current buffer with sound */ | |
| 173 if ( audio->convert.needed ) { | |
| 174 if ( audio->convert.buf ) { | |
| 175 stream = audio->convert.buf; | |
| 176 } else { | |
| 177 continue; | |
| 178 } | |
| 179 } else { | |
| 180 stream = audio->GetAudioBuf(audio); | |
| 181 if ( stream == NULL ) { | |
| 182 stream = audio->fake_stream; | |
| 183 } | |
| 184 } | |
| 185 memset(stream, silence, stream_len); | |
| 186 | |
| 187 if ( ! audio->paused ) { | |
| 188 SDL_mutexP(audio->mixer_lock); | |
| 189 (*fill)(udata, stream, stream_len); | |
| 190 SDL_mutexV(audio->mixer_lock); | |
| 191 } | |
| 192 | |
| 193 /* Convert the audio if necessary */ | |
| 194 if ( audio->convert.needed ) { | |
| 195 SDL_ConvertAudio(&audio->convert); | |
| 196 stream = audio->GetAudioBuf(audio); | |
| 197 if ( stream == NULL ) { | |
| 198 stream = audio->fake_stream; | |
| 199 } | |
| 200 memcpy(stream, audio->convert.buf, | |
| 201 audio->convert.len_cvt); | |
| 202 } | |
| 203 | |
| 204 /* Ready current buffer for play and change current buffer */ | |
| 205 if ( stream != audio->fake_stream ) { | |
| 206 audio->PlayAudio(audio); | |
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207 #ifdef ENABLE_AHI |
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208 /* AmigaOS don't have to wait the first time audio is played! */ |
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209 started++; |
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210 #endif |
| 0 | 211 } |
| 212 } | |
| 213 /* Wait for the audio to drain.. */ | |
| 214 if ( audio->WaitDone ) { | |
| 215 audio->WaitDone(audio); | |
| 216 } | |
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217 |
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218 #ifdef ENABLE_AHI |
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219 D(bug("WaitAudio...Done\n")); |
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220 |
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221 audio->CloseAudio(audio); |
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222 |
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223 D(bug("CloseAudio..Done, subtask exiting...\n")); |
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224 audio_configured = 0; |
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225 #endif |
| 0 | 226 return(0); |
| 227 } | |
| 228 | |
| 229 int SDL_AudioInit(const char *driver_name) | |
| 230 { | |
| 231 SDL_AudioDevice *audio; | |
| 232 int i = 0, idx; | |
| 233 | |
| 234 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 235 if ( current_audio != NULL ) { | |
| 236 SDL_AudioQuit(); | |
| 237 } | |
| 238 | |
| 239 /* Select the proper audio driver */ | |
| 240 audio = NULL; | |
| 241 idx = 0; | |
| 242 #ifdef unix | |
| 243 if ( (driver_name == NULL) && (getenv("ESPEAKER") != NULL) ) { | |
| 244 /* Ahem, we know that if ESPEAKER is set, user probably wants | |
| 245 to use ESD, but don't start it if it's not already running. | |
| 246 This probably isn't the place to do this, but... Shh! :) | |
| 247 */ | |
| 248 for ( i=0; bootstrap[i]; ++i ) { | |
| 249 if ( strcmp(bootstrap[i]->name, "esd") == 0 ) { | |
| 250 const char *esd_no_spawn; | |
| 251 | |
| 252 /* Don't start ESD if it's not running */ | |
| 253 esd_no_spawn = getenv("ESD_NO_SPAWN"); | |
| 254 if ( esd_no_spawn == NULL ) { | |
| 255 putenv("ESD_NO_SPAWN=1"); | |
| 256 } | |
| 257 if ( bootstrap[i]->available() ) { | |
| 258 audio = bootstrap[i]->create(0); | |
| 259 break; | |
| 260 } | |
| 261 #ifdef linux /* No unsetenv() on most platforms */ | |
| 262 if ( esd_no_spawn == NULL ) { | |
| 263 unsetenv("ESD_NO_SPAWN"); | |
| 264 } | |
| 265 #endif | |
| 266 } | |
| 267 } | |
| 268 } | |
| 269 #endif /* unix */ | |
| 270 if ( audio == NULL ) { | |
| 271 if ( driver_name != NULL ) { | |
| 272 #if 0 /* This will be replaced with a better driver selection API */ | |
| 273 if ( strrchr(driver_name, ':') != NULL ) { | |
| 274 idx = atoi(strrchr(driver_name, ':')+1); | |
| 275 } | |
| 276 #endif | |
| 277 for ( i=0; bootstrap[i]; ++i ) { | |
| 278 if (strncmp(bootstrap[i]->name, driver_name, | |
| 279 strlen(bootstrap[i]->name)) == 0) { | |
| 280 if ( bootstrap[i]->available() ) { | |
| 281 audio=bootstrap[i]->create(idx); | |
| 282 break; | |
| 283 } | |
| 284 } | |
| 285 } | |
| 286 } else { | |
| 287 for ( i=0; bootstrap[i]; ++i ) { | |
| 288 if ( bootstrap[i]->available() ) { | |
| 289 audio = bootstrap[i]->create(idx); | |
| 290 if ( audio != NULL ) { | |
| 291 break; | |
| 292 } | |
| 293 } | |
| 294 } | |
| 295 } | |
| 296 if ( audio == NULL ) { | |
| 297 SDL_SetError("No available audio device"); | |
| 298 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 299 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 300 */ | |
| 301 return(-1); | |
| 302 #endif | |
| 303 } | |
| 304 } | |
| 305 current_audio = audio; | |
| 306 if ( current_audio ) { | |
| 307 current_audio->name = bootstrap[i]->name; | |
| 308 } | |
| 309 return(0); | |
| 310 } | |
| 311 | |
| 312 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 313 { | |
| 314 if ( current_audio != NULL ) { | |
| 315 strncpy(namebuf, current_audio->name, maxlen-1); | |
| 316 namebuf[maxlen-1] = '\0'; | |
| 317 return(namebuf); | |
| 318 } | |
| 319 return(NULL); | |
| 320 } | |
| 321 | |
| 322 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 323 { | |
| 324 SDL_AudioDevice *audio; | |
| 325 | |
| 326 /* Start up the audio driver, if necessary */ | |
| 327 if ( ! current_audio ) { | |
| 328 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 329 (current_audio == NULL) ) { | |
| 330 return(-1); | |
| 331 } | |
| 332 } | |
| 333 audio = current_audio; | |
| 334 | |
| 335 /* Verify some parameters */ | |
| 336 if ( desired->callback == NULL ) { | |
| 337 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 338 return(-1); | |
| 339 } | |
| 340 switch ( desired->channels ) { | |
| 341 case 1: /* Mono */ | |
| 342 case 2: /* Stereo */ | |
| 343 break; | |
| 344 default: | |
| 345 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 346 return(-1); | |
| 347 } | |
| 348 | |
| 349 #ifdef macintosh | |
| 350 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ | |
| 351 #else | |
| 352 /* Create a semaphore for locking the sound buffers */ | |
| 353 audio->mixer_lock = SDL_CreateMutex(); | |
| 354 if ( audio->mixer_lock == NULL ) { | |
| 355 SDL_SetError("Couldn't create mixer lock"); | |
| 356 SDL_CloseAudio(); | |
| 357 return(-1); | |
| 358 } | |
| 359 #endif | |
| 360 | |
| 361 /* Calculate the silence and size of the audio specification */ | |
| 362 SDL_CalculateAudioSpec(desired); | |
| 363 | |
| 364 /* Open the audio subsystem */ | |
| 365 memcpy(&audio->spec, desired, sizeof(audio->spec)); | |
| 366 audio->convert.needed = 0; | |
| 367 audio->enabled = 1; | |
| 368 audio->paused = 1; | |
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369 |
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370 #ifndef ENABLE_AHI |
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371 |
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372 /* AmigaOS opens audio inside the main loop */ |
| 0 | 373 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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374 |
| 0 | 375 if ( ! audio->opened ) { |
| 376 SDL_CloseAudio(); | |
| 377 return(-1); | |
| 378 } | |
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379 #else |
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380 D(bug("Locking semaphore...")); |
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381 SDL_mutexP(audio->mixer_lock); |
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382 |
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383 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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384 D(bug("Created thread...\n")); |
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385 |
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386 if ( audio->thread == NULL ) { |
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387 SDL_mutexV(audio->mixer_lock); |
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388 SDL_CloseAudio(); |
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389 SDL_SetError("Couldn't create audio thread"); |
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390 return(-1); |
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391 } |
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392 |
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393 while(!audio_configured) |
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394 SDL_Delay(100); |
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395 #endif |
| 0 | 396 |
| 397 /* If the audio driver changes the buffer size, accept it */ | |
| 398 if ( audio->spec.samples != desired->samples ) { | |
| 399 desired->samples = audio->spec.samples; | |
| 400 SDL_CalculateAudioSpec(desired); | |
| 401 } | |
| 402 | |
| 403 /* Allocate a fake audio memory buffer */ | |
| 404 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 405 if ( audio->fake_stream == NULL ) { | |
| 406 SDL_CloseAudio(); | |
| 407 SDL_OutOfMemory(); | |
| 408 return(-1); | |
| 409 } | |
| 410 | |
| 411 /* See if we need to do any conversion */ | |
| 412 if ( memcmp(desired, &audio->spec, sizeof(audio->spec)) == 0 ) { | |
| 413 /* Just copy over the desired audio specification */ | |
| 414 if ( obtained != NULL ) { | |
| 415 memcpy(obtained, &audio->spec, sizeof(audio->spec)); | |
| 416 } | |
| 417 } else { | |
| 418 /* Copy over the audio specification if possible */ | |
| 419 if ( obtained != NULL ) { | |
| 420 memcpy(obtained, &audio->spec, sizeof(audio->spec)); | |
| 421 } else { | |
| 422 /* Build an audio conversion block */ | |
| 423 if ( SDL_BuildAudioCVT(&audio->convert, | |
| 424 desired->format, desired->channels, | |
| 425 desired->freq, | |
| 426 audio->spec.format, audio->spec.channels, | |
| 427 audio->spec.freq) < 0 ) { | |
| 428 SDL_CloseAudio(); | |
| 429 return(-1); | |
| 430 } | |
| 431 if ( audio->convert.needed ) { | |
| 432 audio->convert.len = desired->size; | |
| 433 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( | |
| 434 audio->convert.len*audio->convert.len_mult); | |
| 435 if ( audio->convert.buf == NULL ) { | |
| 436 SDL_CloseAudio(); | |
| 437 SDL_OutOfMemory(); | |
| 438 return(-1); | |
| 439 } | |
| 440 } | |
| 441 } | |
| 442 } | |
| 443 | |
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444 #ifndef ENABLE_AHI |
| 0 | 445 /* Start the audio thread if necessary */ |
| 446 switch (audio->opened) { | |
| 447 case 1: | |
| 448 /* Start the audio thread */ | |
| 449 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); | |
| 450 if ( audio->thread == NULL ) { | |
| 451 SDL_CloseAudio(); | |
| 452 SDL_SetError("Couldn't create audio thread"); | |
| 453 return(-1); | |
| 454 } | |
| 455 break; | |
| 456 | |
| 457 default: | |
| 458 /* The audio is now playing */ | |
| 459 break; | |
| 460 } | |
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461 #else |
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462 SDL_mutexV(audio->mixer_lock); |
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463 D(bug("SDL_OpenAudio USCITA...\n")); |
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464 |
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465 #endif |
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466 |
| 0 | 467 return(0); |
| 468 } | |
| 469 | |
| 470 SDL_audiostatus SDL_GetAudioStatus(void) | |
| 471 { | |
| 472 SDL_AudioDevice *audio = current_audio; | |
| 473 SDL_audiostatus status; | |
| 474 | |
| 475 status = SDL_AUDIO_STOPPED; | |
| 476 if ( audio && audio->enabled ) { | |
| 477 if ( audio->paused ) { | |
| 478 status = SDL_AUDIO_PAUSED; | |
| 479 } else { | |
| 480 status = SDL_AUDIO_PLAYING; | |
| 481 } | |
| 482 } | |
| 483 return(status); | |
| 484 } | |
| 485 | |
| 486 void SDL_PauseAudio (int pause_on) | |
| 487 { | |
| 488 SDL_AudioDevice *audio = current_audio; | |
| 489 | |
| 490 if ( audio ) { | |
| 491 audio->paused = pause_on; | |
| 492 } | |
| 493 } | |
| 494 | |
| 495 void SDL_LockAudio (void) | |
| 496 { | |
| 497 SDL_AudioDevice *audio = current_audio; | |
| 498 | |
| 499 /* Obtain a lock on the mixing buffers */ | |
| 500 if ( audio ) { | |
| 501 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { | |
| 502 return; | |
| 503 } | |
| 504 SDL_mutexP(audio->mixer_lock); | |
| 505 } | |
| 506 } | |
| 507 | |
| 508 void SDL_UnlockAudio (void) | |
| 509 { | |
| 510 SDL_AudioDevice *audio = current_audio; | |
| 511 | |
| 512 /* Release lock on the mixing buffers */ | |
| 513 if ( audio ) { | |
| 514 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { | |
| 515 return; | |
| 516 } | |
| 517 SDL_mutexV(audio->mixer_lock); | |
| 518 } | |
| 519 } | |
| 520 | |
| 521 void SDL_CloseAudio (void) | |
| 522 { | |
| 523 SDL_QuitSubSystem(SDL_INIT_AUDIO); | |
| 524 } | |
| 525 | |
| 526 void SDL_AudioQuit(void) | |
| 527 { | |
| 528 SDL_AudioDevice *audio = current_audio; | |
| 529 | |
| 530 if ( audio ) { | |
| 531 audio->enabled = 0; | |
| 532 if ( audio->thread != NULL ) { | |
| 533 SDL_WaitThread(audio->thread, NULL); | |
| 534 } | |
| 535 if ( audio->mixer_lock != NULL ) { | |
| 536 SDL_DestroyMutex(audio->mixer_lock); | |
| 537 } | |
| 538 if ( audio->fake_stream != NULL ) { | |
| 539 SDL_FreeAudioMem(audio->fake_stream); | |
| 540 } | |
| 541 if ( audio->convert.needed ) { | |
| 542 SDL_FreeAudioMem(audio->convert.buf); | |
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543 |
| 0 | 544 } |
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545 #ifndef ENABLE_AHI |
| 0 | 546 if ( audio->opened ) { |
| 547 audio->CloseAudio(audio); | |
| 548 audio->opened = 0; | |
| 549 } | |
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550 #endif |
| 0 | 551 /* Free the driver data */ |
| 552 audio->free(audio); | |
| 553 current_audio = NULL; | |
| 554 } | |
| 555 } | |
| 556 | |
| 557 #define NUM_FORMATS 6 | |
| 558 static int format_idx; | |
| 559 static int format_idx_sub; | |
| 560 static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { | |
| 561 { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 562 { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 563 { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 564 { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 565 { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 566 { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 567 }; | |
| 568 | |
| 569 Uint16 SDL_FirstAudioFormat(Uint16 format) | |
| 570 { | |
| 571 for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { | |
| 572 if ( format_list[format_idx][0] == format ) { | |
| 573 break; | |
| 574 } | |
| 575 } | |
| 576 format_idx_sub = 0; | |
| 577 return(SDL_NextAudioFormat()); | |
| 578 } | |
| 579 | |
| 580 Uint16 SDL_NextAudioFormat(void) | |
| 581 { | |
| 582 if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { | |
| 583 return(0); | |
| 584 } | |
| 585 return(format_list[format_idx][format_idx_sub++]); | |
| 586 } | |
| 587 | |
| 588 void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) | |
| 589 { | |
| 590 switch (spec->format) { | |
| 591 case AUDIO_U8: | |
| 592 spec->silence = 0x80; | |
| 593 break; | |
| 594 default: | |
| 595 spec->silence = 0x00; | |
| 596 break; | |
| 597 } | |
| 598 spec->size = (spec->format&0xFF)/8; | |
| 599 spec->size *= spec->channels; | |
| 600 spec->size *= spec->samples; | |
| 601 } |