Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 277:255c7ee077cb
Added a YUV overlay test program (thanks Jon!)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 14 Feb 2002 00:47:46 +0000 |
| parents | ba5363e21df8 |
| children | f6ffac90895c |
| 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 | |
|
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20 slouken@libsdl.org |
| 0 | 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[] = { | |
|
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43 #ifdef OPENBSD_AUDIO_SUPPORT |
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44 &OPENBSD_AUDIO_bootstrap, |
|
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45 #endif |
| 0 | 46 #ifdef OSS_SUPPORT |
| 47 &DSP_bootstrap, | |
| 48 &DMA_bootstrap, | |
| 49 #endif | |
| 50 #ifdef ALSA_SUPPORT | |
| 51 &ALSA_bootstrap, | |
| 52 #endif | |
|
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53 #ifdef SUNAUDIO_SUPPORT |
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54 &SUNAUDIO_bootstrap, |
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55 #endif |
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56 #ifdef DMEDIA_SUPPORT |
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57 &DMEDIA_bootstrap, |
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58 #endif |
| 0 | 59 #ifdef ARTSC_SUPPORT |
| 60 &ARTSC_bootstrap, | |
| 61 #endif | |
| 62 #ifdef ESD_SUPPORT | |
| 63 &ESD_bootstrap, | |
| 64 #endif | |
| 65 #ifdef NAS_SUPPORT | |
| 66 &NAS_bootstrap, | |
| 67 #endif | |
| 68 #ifdef ENABLE_DIRECTX | |
| 69 &DSOUND_bootstrap, | |
| 70 #endif | |
| 71 #ifdef ENABLE_WINDIB | |
| 72 &WAVEOUT_bootstrap, | |
| 73 #endif | |
| 74 #ifdef __BEOS__ | |
| 75 &BAUDIO_bootstrap, | |
| 76 #endif | |
| 77 #if defined(macintosh) || TARGET_API_MAC_CARBON | |
| 78 &SNDMGR_bootstrap, | |
| 79 #endif | |
| 80 #ifdef _AIX | |
| 81 &Paud_bootstrap, | |
| 82 #endif | |
|
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83 #ifdef ENABLE_AHI |
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84 &AHI_bootstrap, |
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85 #endif |
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86 #ifdef DISKAUD_SUPPORT |
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87 &DISKAUD_bootstrap, |
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88 #endif |
| 0 | 89 NULL |
| 90 }; | |
| 91 SDL_AudioDevice *current_audio = NULL; | |
| 92 | |
| 93 /* Various local functions */ | |
| 94 int SDL_AudioInit(const char *driver_name); | |
| 95 void SDL_AudioQuit(void); | |
| 96 | |
|
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97 #ifdef ENABLE_AHI |
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98 static int audio_configured = 0; |
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99 #endif |
| 0 | 100 |
| 101 /* The general mixing thread function */ | |
| 102 int SDL_RunAudio(void *audiop) | |
| 103 { | |
| 104 SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; | |
| 105 Uint8 *stream; | |
| 106 int stream_len; | |
| 107 void *udata; | |
| 108 void (*fill)(void *userdata,Uint8 *stream, int len); | |
| 109 int silence; | |
|
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110 #ifdef ENABLE_AHI |
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111 int started = 0; |
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112 |
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113 /* AmigaOS NEEDS that the audio driver is opened in the thread that uses it! */ |
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114 |
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115 D(bug("Task audio started audio struct:<%lx>...\n",audiop)); |
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116 |
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117 D(bug("Before Openaudio...")); |
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118 if(audio->OpenAudio(audio, &audio->spec)==-1) |
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119 { |
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120 D(bug("Open audio failed...\n")); |
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121 return(-1); |
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122 } |
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123 D(bug("OpenAudio...OK\n")); |
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124 #endif |
| 0 | 125 |
| 126 /* Perform any thread setup */ | |
| 127 if ( audio->ThreadInit ) { | |
| 128 audio->ThreadInit(audio); | |
| 129 } | |
| 130 audio->threadid = SDL_ThreadID(); | |
| 131 | |
| 132 /* Set up the mixing function */ | |
| 133 fill = audio->spec.callback; | |
| 134 udata = audio->spec.userdata; | |
|
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135 |
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136 #ifdef ENABLE_AHI |
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137 audio_configured = 1; |
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138 |
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139 D(bug("Audio configured... Checking for conversion\n")); |
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140 SDL_mutexP(audio->mixer_lock); |
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141 D(bug("Semaphore obtained...\n")); |
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142 #endif |
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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 } | |
| 155 stream = audio->fake_stream; | |
| 156 | |
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157 #ifdef ENABLE_AHI |
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158 SDL_mutexV(audio->mixer_lock); |
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159 D(bug("Entering audio loop...\n")); |
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160 #endif |
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161 |
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162 |
| 0 | 163 /* Loop, filling the audio buffers */ |
| 164 while ( audio->enabled ) { | |
| 165 | |
| 166 /* Wait for new current buffer to finish playing */ | |
| 167 if ( stream == audio->fake_stream ) { | |
| 168 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); | |
| 169 } else { | |
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170 #ifdef ENABLE_AHI |
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171 if ( started > 1 ) |
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172 #endif |
| 0 | 173 audio->WaitAudio(audio); |
| 174 } | |
| 175 | |
| 176 /* Fill the current buffer with sound */ | |
| 177 if ( audio->convert.needed ) { | |
| 178 if ( audio->convert.buf ) { | |
| 179 stream = audio->convert.buf; | |
| 180 } else { | |
| 181 continue; | |
| 182 } | |
| 183 } else { | |
| 184 stream = audio->GetAudioBuf(audio); | |
| 185 if ( stream == NULL ) { | |
| 186 stream = audio->fake_stream; | |
| 187 } | |
| 188 } | |
| 189 memset(stream, silence, stream_len); | |
| 190 | |
| 191 if ( ! audio->paused ) { | |
| 192 SDL_mutexP(audio->mixer_lock); | |
| 193 (*fill)(udata, stream, stream_len); | |
| 194 SDL_mutexV(audio->mixer_lock); | |
| 195 } | |
| 196 | |
| 197 /* Convert the audio if necessary */ | |
| 198 if ( audio->convert.needed ) { | |
| 199 SDL_ConvertAudio(&audio->convert); | |
| 200 stream = audio->GetAudioBuf(audio); | |
| 201 if ( stream == NULL ) { | |
| 202 stream = audio->fake_stream; | |
| 203 } | |
| 204 memcpy(stream, audio->convert.buf, | |
| 205 audio->convert.len_cvt); | |
| 206 } | |
| 207 | |
| 208 /* Ready current buffer for play and change current buffer */ | |
| 209 if ( stream != audio->fake_stream ) { | |
| 210 audio->PlayAudio(audio); | |
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211 #ifdef ENABLE_AHI |
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212 /* AmigaOS don't have to wait the first time audio is played! */ |
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213 started++; |
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214 #endif |
| 0 | 215 } |
| 216 } | |
| 217 /* Wait for the audio to drain.. */ | |
| 218 if ( audio->WaitDone ) { | |
| 219 audio->WaitDone(audio); | |
| 220 } | |
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221 |
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222 #ifdef ENABLE_AHI |
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223 D(bug("WaitAudio...Done\n")); |
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224 |
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225 audio->CloseAudio(audio); |
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226 |
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227 D(bug("CloseAudio..Done, subtask exiting...\n")); |
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228 audio_configured = 0; |
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229 #endif |
| 0 | 230 return(0); |
| 231 } | |
| 232 | |
| 233 int SDL_AudioInit(const char *driver_name) | |
| 234 { | |
| 235 SDL_AudioDevice *audio; | |
| 236 int i = 0, idx; | |
| 237 | |
| 238 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 239 if ( current_audio != NULL ) { | |
| 240 SDL_AudioQuit(); | |
| 241 } | |
| 242 | |
| 243 /* Select the proper audio driver */ | |
| 244 audio = NULL; | |
| 245 idx = 0; | |
| 246 #ifdef unix | |
| 247 if ( (driver_name == NULL) && (getenv("ESPEAKER") != NULL) ) { | |
| 248 /* Ahem, we know that if ESPEAKER is set, user probably wants | |
| 249 to use ESD, but don't start it if it's not already running. | |
| 250 This probably isn't the place to do this, but... Shh! :) | |
| 251 */ | |
| 252 for ( i=0; bootstrap[i]; ++i ) { | |
| 253 if ( strcmp(bootstrap[i]->name, "esd") == 0 ) { | |
| 254 const char *esd_no_spawn; | |
| 255 | |
| 256 /* Don't start ESD if it's not running */ | |
| 257 esd_no_spawn = getenv("ESD_NO_SPAWN"); | |
| 258 if ( esd_no_spawn == NULL ) { | |
| 259 putenv("ESD_NO_SPAWN=1"); | |
| 260 } | |
| 261 if ( bootstrap[i]->available() ) { | |
| 262 audio = bootstrap[i]->create(0); | |
| 263 break; | |
| 264 } | |
| 265 #ifdef linux /* No unsetenv() on most platforms */ | |
| 266 if ( esd_no_spawn == NULL ) { | |
| 267 unsetenv("ESD_NO_SPAWN"); | |
| 268 } | |
| 269 #endif | |
| 270 } | |
| 271 } | |
| 272 } | |
| 273 #endif /* unix */ | |
| 274 if ( audio == NULL ) { | |
| 275 if ( driver_name != NULL ) { | |
| 276 #if 0 /* This will be replaced with a better driver selection API */ | |
| 277 if ( strrchr(driver_name, ':') != NULL ) { | |
| 278 idx = atoi(strrchr(driver_name, ':')+1); | |
| 279 } | |
| 280 #endif | |
| 281 for ( i=0; bootstrap[i]; ++i ) { | |
| 282 if (strncmp(bootstrap[i]->name, driver_name, | |
| 283 strlen(bootstrap[i]->name)) == 0) { | |
| 284 if ( bootstrap[i]->available() ) { | |
| 285 audio=bootstrap[i]->create(idx); | |
| 286 break; | |
| 287 } | |
| 288 } | |
| 289 } | |
| 290 } else { | |
| 291 for ( i=0; bootstrap[i]; ++i ) { | |
| 292 if ( bootstrap[i]->available() ) { | |
| 293 audio = bootstrap[i]->create(idx); | |
| 294 if ( audio != NULL ) { | |
| 295 break; | |
| 296 } | |
| 297 } | |
| 298 } | |
| 299 } | |
| 300 if ( audio == NULL ) { | |
| 301 SDL_SetError("No available audio device"); | |
| 302 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 303 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 304 */ | |
| 305 return(-1); | |
| 306 #endif | |
| 307 } | |
| 308 } | |
| 309 current_audio = audio; | |
| 310 if ( current_audio ) { | |
| 311 current_audio->name = bootstrap[i]->name; | |
| 312 } | |
| 313 return(0); | |
| 314 } | |
| 315 | |
| 316 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 317 { | |
| 318 if ( current_audio != NULL ) { | |
| 319 strncpy(namebuf, current_audio->name, maxlen-1); | |
| 320 namebuf[maxlen-1] = '\0'; | |
| 321 return(namebuf); | |
| 322 } | |
| 323 return(NULL); | |
| 324 } | |
| 325 | |
| 326 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 327 { | |
| 328 SDL_AudioDevice *audio; | |
| 329 | |
| 330 /* Start up the audio driver, if necessary */ | |
| 331 if ( ! current_audio ) { | |
| 332 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 333 (current_audio == NULL) ) { | |
| 334 return(-1); | |
| 335 } | |
| 336 } | |
| 337 audio = current_audio; | |
| 338 | |
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339 if (audio->opened) { |
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340 SDL_SetError("Audio device is already opened"); |
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341 return(-1); |
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342 } |
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343 |
| 0 | 344 /* Verify some parameters */ |
| 345 if ( desired->callback == NULL ) { | |
| 346 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 347 return(-1); | |
| 348 } | |
| 349 switch ( desired->channels ) { | |
| 350 case 1: /* Mono */ | |
| 351 case 2: /* Stereo */ | |
| 352 break; | |
| 353 default: | |
| 354 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 355 return(-1); | |
| 356 } | |
| 357 | |
| 358 #ifdef macintosh | |
| 359 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ | |
| 360 #else | |
| 361 /* Create a semaphore for locking the sound buffers */ | |
| 362 audio->mixer_lock = SDL_CreateMutex(); | |
| 363 if ( audio->mixer_lock == NULL ) { | |
| 364 SDL_SetError("Couldn't create mixer lock"); | |
| 365 SDL_CloseAudio(); | |
| 366 return(-1); | |
| 367 } | |
| 368 #endif | |
| 369 | |
| 370 /* Calculate the silence and size of the audio specification */ | |
| 371 SDL_CalculateAudioSpec(desired); | |
| 372 | |
| 373 /* Open the audio subsystem */ | |
| 374 memcpy(&audio->spec, desired, sizeof(audio->spec)); | |
| 375 audio->convert.needed = 0; | |
| 376 audio->enabled = 1; | |
| 377 audio->paused = 1; | |
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378 |
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379 #ifndef ENABLE_AHI |
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380 |
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381 /* AmigaOS opens audio inside the main loop */ |
| 0 | 382 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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383 |
| 0 | 384 if ( ! audio->opened ) { |
| 385 SDL_CloseAudio(); | |
| 386 return(-1); | |
| 387 } | |
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388 #else |
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389 D(bug("Locking semaphore...")); |
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390 SDL_mutexP(audio->mixer_lock); |
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391 |
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392 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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393 D(bug("Created thread...\n")); |
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394 |
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395 if ( audio->thread == NULL ) { |
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396 SDL_mutexV(audio->mixer_lock); |
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397 SDL_CloseAudio(); |
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398 SDL_SetError("Couldn't create audio thread"); |
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399 return(-1); |
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400 } |
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401 |
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402 while(!audio_configured) |
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403 SDL_Delay(100); |
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404 #endif |
| 0 | 405 |
| 406 /* If the audio driver changes the buffer size, accept it */ | |
| 407 if ( audio->spec.samples != desired->samples ) { | |
| 408 desired->samples = audio->spec.samples; | |
| 409 SDL_CalculateAudioSpec(desired); | |
| 410 } | |
| 411 | |
| 412 /* Allocate a fake audio memory buffer */ | |
| 413 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 414 if ( audio->fake_stream == NULL ) { | |
| 415 SDL_CloseAudio(); | |
| 416 SDL_OutOfMemory(); | |
| 417 return(-1); | |
| 418 } | |
| 419 | |
| 420 /* See if we need to do any conversion */ | |
| 421 if ( memcmp(desired, &audio->spec, sizeof(audio->spec)) == 0 ) { | |
| 422 /* Just copy over the desired audio specification */ | |
| 423 if ( obtained != NULL ) { | |
| 424 memcpy(obtained, &audio->spec, sizeof(audio->spec)); | |
| 425 } | |
| 426 } else { | |
| 427 /* Copy over the audio specification if possible */ | |
| 428 if ( obtained != NULL ) { | |
| 429 memcpy(obtained, &audio->spec, sizeof(audio->spec)); | |
| 430 } else { | |
| 431 /* Build an audio conversion block */ | |
| 432 if ( SDL_BuildAudioCVT(&audio->convert, | |
| 433 desired->format, desired->channels, | |
| 434 desired->freq, | |
| 435 audio->spec.format, audio->spec.channels, | |
| 436 audio->spec.freq) < 0 ) { | |
| 437 SDL_CloseAudio(); | |
| 438 return(-1); | |
| 439 } | |
| 440 if ( audio->convert.needed ) { | |
| 441 audio->convert.len = desired->size; | |
| 442 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( | |
| 443 audio->convert.len*audio->convert.len_mult); | |
| 444 if ( audio->convert.buf == NULL ) { | |
| 445 SDL_CloseAudio(); | |
| 446 SDL_OutOfMemory(); | |
| 447 return(-1); | |
| 448 } | |
| 449 } | |
| 450 } | |
| 451 } | |
| 452 | |
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453 #ifndef ENABLE_AHI |
| 0 | 454 /* Start the audio thread if necessary */ |
| 455 switch (audio->opened) { | |
| 456 case 1: | |
| 457 /* Start the audio thread */ | |
| 458 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); | |
| 459 if ( audio->thread == NULL ) { | |
| 460 SDL_CloseAudio(); | |
| 461 SDL_SetError("Couldn't create audio thread"); | |
| 462 return(-1); | |
| 463 } | |
| 464 break; | |
| 465 | |
| 466 default: | |
| 467 /* The audio is now playing */ | |
| 468 break; | |
| 469 } | |
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470 #else |
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471 SDL_mutexV(audio->mixer_lock); |
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472 D(bug("SDL_OpenAudio USCITA...\n")); |
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473 |
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474 #endif |
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475 |
| 0 | 476 return(0); |
| 477 } | |
| 478 | |
| 479 SDL_audiostatus SDL_GetAudioStatus(void) | |
| 480 { | |
| 481 SDL_AudioDevice *audio = current_audio; | |
| 482 SDL_audiostatus status; | |
| 483 | |
| 484 status = SDL_AUDIO_STOPPED; | |
| 485 if ( audio && audio->enabled ) { | |
| 486 if ( audio->paused ) { | |
| 487 status = SDL_AUDIO_PAUSED; | |
| 488 } else { | |
| 489 status = SDL_AUDIO_PLAYING; | |
| 490 } | |
| 491 } | |
| 492 return(status); | |
| 493 } | |
| 494 | |
| 495 void SDL_PauseAudio (int pause_on) | |
| 496 { | |
| 497 SDL_AudioDevice *audio = current_audio; | |
| 498 | |
| 499 if ( audio ) { | |
| 500 audio->paused = pause_on; | |
| 501 } | |
| 502 } | |
| 503 | |
| 504 void SDL_LockAudio (void) | |
| 505 { | |
| 506 SDL_AudioDevice *audio = current_audio; | |
| 507 | |
| 508 /* Obtain a lock on the mixing buffers */ | |
| 509 if ( audio ) { | |
| 510 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { | |
| 511 return; | |
| 512 } | |
| 513 SDL_mutexP(audio->mixer_lock); | |
| 514 } | |
| 515 } | |
| 516 | |
| 517 void SDL_UnlockAudio (void) | |
| 518 { | |
| 519 SDL_AudioDevice *audio = current_audio; | |
| 520 | |
| 521 /* Release lock on the mixing buffers */ | |
| 522 if ( audio ) { | |
| 523 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { | |
| 524 return; | |
| 525 } | |
| 526 SDL_mutexV(audio->mixer_lock); | |
| 527 } | |
| 528 } | |
| 529 | |
| 530 void SDL_CloseAudio (void) | |
| 531 { | |
| 532 SDL_QuitSubSystem(SDL_INIT_AUDIO); | |
| 533 } | |
| 534 | |
| 535 void SDL_AudioQuit(void) | |
| 536 { | |
| 537 SDL_AudioDevice *audio = current_audio; | |
| 538 | |
| 539 if ( audio ) { | |
| 540 audio->enabled = 0; | |
| 541 if ( audio->thread != NULL ) { | |
| 542 SDL_WaitThread(audio->thread, NULL); | |
| 543 } | |
| 544 if ( audio->mixer_lock != NULL ) { | |
| 545 SDL_DestroyMutex(audio->mixer_lock); | |
| 546 } | |
| 547 if ( audio->fake_stream != NULL ) { | |
| 548 SDL_FreeAudioMem(audio->fake_stream); | |
| 549 } | |
| 550 if ( audio->convert.needed ) { | |
| 551 SDL_FreeAudioMem(audio->convert.buf); | |
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552 |
| 0 | 553 } |
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554 #ifndef ENABLE_AHI |
| 0 | 555 if ( audio->opened ) { |
| 556 audio->CloseAudio(audio); | |
| 557 audio->opened = 0; | |
| 558 } | |
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559 #endif |
| 0 | 560 /* Free the driver data */ |
| 561 audio->free(audio); | |
| 562 current_audio = NULL; | |
| 563 } | |
| 564 } | |
| 565 | |
| 566 #define NUM_FORMATS 6 | |
| 567 static int format_idx; | |
| 568 static int format_idx_sub; | |
| 569 static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { | |
| 570 { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 571 { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 572 { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 573 { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 574 { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 575 { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 576 }; | |
| 577 | |
| 578 Uint16 SDL_FirstAudioFormat(Uint16 format) | |
| 579 { | |
| 580 for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { | |
| 581 if ( format_list[format_idx][0] == format ) { | |
| 582 break; | |
| 583 } | |
| 584 } | |
| 585 format_idx_sub = 0; | |
| 586 return(SDL_NextAudioFormat()); | |
| 587 } | |
| 588 | |
| 589 Uint16 SDL_NextAudioFormat(void) | |
| 590 { | |
| 591 if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { | |
| 592 return(0); | |
| 593 } | |
| 594 return(format_list[format_idx][format_idx_sub++]); | |
| 595 } | |
| 596 | |
| 597 void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) | |
| 598 { | |
| 599 switch (spec->format) { | |
| 600 case AUDIO_U8: | |
| 601 spec->silence = 0x80; | |
| 602 break; | |
| 603 default: | |
| 604 spec->silence = 0x00; | |
| 605 break; | |
| 606 } | |
| 607 spec->size = (spec->format&0xFF)/8; | |
| 608 spec->size *= spec->channels; | |
| 609 spec->size *= spec->samples; | |
| 610 } |