Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 136:717f739d6ec1
Added hardware stretching code to scale 640x480 to TV resolution
There's a bug of some kind in the 16bpp code. ??
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 01 Aug 2001 08:41:45 +0000 |
| parents | 43febd46d49d |
| children | 8758b8d42cd9 |
| 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[] = { | |
|
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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 | |
|
35
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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 #ifdef DISKAUD_SUPPORT |
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85 &DISKAUD_bootstrap, |
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86 #endif |
| 0 | 87 NULL |
| 88 }; | |
| 89 SDL_AudioDevice *current_audio = NULL; | |
| 90 | |
| 91 /* Various local functions */ | |
| 92 int SDL_AudioInit(const char *driver_name); | |
| 93 void SDL_AudioQuit(void); | |
| 94 | |
|
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95 #ifdef ENABLE_AHI |
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96 static int audio_configured = 0; |
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97 #endif |
| 0 | 98 |
| 99 /* The general mixing thread function */ | |
| 100 int SDL_RunAudio(void *audiop) | |
| 101 { | |
| 102 SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; | |
| 103 Uint8 *stream; | |
| 104 int stream_len; | |
| 105 void *udata; | |
| 106 void (*fill)(void *userdata,Uint8 *stream, int len); | |
| 107 int silence; | |
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108 #ifdef ENABLE_AHI |
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109 int started = 0; |
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110 |
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111 /* AmigaOS NEEDS that the audio driver is opened in the thread that uses it! */ |
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112 |
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113 D(bug("Task audio started audio struct:<%lx>...\n",audiop)); |
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114 |
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115 D(bug("Before Openaudio...")); |
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116 if(audio->OpenAudio(audio, &audio->spec)==-1) |
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117 { |
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118 D(bug("Open audio failed...\n")); |
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119 return(-1); |
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120 } |
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121 D(bug("OpenAudio...OK\n")); |
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122 #endif |
| 0 | 123 |
| 124 /* Perform any thread setup */ | |
| 125 if ( audio->ThreadInit ) { | |
| 126 audio->ThreadInit(audio); | |
| 127 } | |
| 128 audio->threadid = SDL_ThreadID(); | |
| 129 | |
| 130 /* Set up the mixing function */ | |
| 131 fill = audio->spec.callback; | |
| 132 udata = audio->spec.userdata; | |
|
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133 |
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134 #ifdef ENABLE_AHI |
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135 audio_configured = 1; |
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136 |
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137 D(bug("Audio configured... Checking for conversion\n")); |
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138 SDL_mutexP(audio->mixer_lock); |
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139 D(bug("Semaphore obtained...\n")); |
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140 #endif |
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141 |
| 0 | 142 if ( audio->convert.needed ) { |
| 143 if ( audio->convert.src_format == AUDIO_U8 ) { | |
| 144 silence = 0x80; | |
| 145 } else { | |
| 146 silence = 0; | |
| 147 } | |
| 148 stream_len = audio->convert.len; | |
| 149 } else { | |
| 150 silence = audio->spec.silence; | |
| 151 stream_len = audio->spec.size; | |
| 152 } | |
| 153 stream = audio->fake_stream; | |
| 154 | |
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155 #ifdef ENABLE_AHI |
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156 SDL_mutexV(audio->mixer_lock); |
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157 D(bug("Entering audio loop...\n")); |
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158 #endif |
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159 |
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160 |
| 0 | 161 /* Loop, filling the audio buffers */ |
| 162 while ( audio->enabled ) { | |
| 163 | |
| 164 /* Wait for new current buffer to finish playing */ | |
| 165 if ( stream == audio->fake_stream ) { | |
| 166 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); | |
| 167 } else { | |
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168 #ifdef ENABLE_AHI |
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169 if ( started > 1 ) |
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170 #endif |
| 0 | 171 audio->WaitAudio(audio); |
| 172 } | |
| 173 | |
| 174 /* Fill the current buffer with sound */ | |
| 175 if ( audio->convert.needed ) { | |
| 176 if ( audio->convert.buf ) { | |
| 177 stream = audio->convert.buf; | |
| 178 } else { | |
| 179 continue; | |
| 180 } | |
| 181 } else { | |
| 182 stream = audio->GetAudioBuf(audio); | |
| 183 if ( stream == NULL ) { | |
| 184 stream = audio->fake_stream; | |
| 185 } | |
| 186 } | |
| 187 memset(stream, silence, stream_len); | |
| 188 | |
| 189 if ( ! audio->paused ) { | |
| 190 SDL_mutexP(audio->mixer_lock); | |
| 191 (*fill)(udata, stream, stream_len); | |
| 192 SDL_mutexV(audio->mixer_lock); | |
| 193 } | |
| 194 | |
| 195 /* Convert the audio if necessary */ | |
| 196 if ( audio->convert.needed ) { | |
| 197 SDL_ConvertAudio(&audio->convert); | |
| 198 stream = audio->GetAudioBuf(audio); | |
| 199 if ( stream == NULL ) { | |
| 200 stream = audio->fake_stream; | |
| 201 } | |
| 202 memcpy(stream, audio->convert.buf, | |
| 203 audio->convert.len_cvt); | |
| 204 } | |
| 205 | |
| 206 /* Ready current buffer for play and change current buffer */ | |
| 207 if ( stream != audio->fake_stream ) { | |
| 208 audio->PlayAudio(audio); | |
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209 #ifdef ENABLE_AHI |
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210 /* AmigaOS don't have to wait the first time audio is played! */ |
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211 started++; |
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212 #endif |
| 0 | 213 } |
| 214 } | |
| 215 /* Wait for the audio to drain.. */ | |
| 216 if ( audio->WaitDone ) { | |
| 217 audio->WaitDone(audio); | |
| 218 } | |
|
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219 |
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220 #ifdef ENABLE_AHI |
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221 D(bug("WaitAudio...Done\n")); |
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222 |
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223 audio->CloseAudio(audio); |
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224 |
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225 D(bug("CloseAudio..Done, subtask exiting...\n")); |
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226 audio_configured = 0; |
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227 #endif |
| 0 | 228 return(0); |
| 229 } | |
| 230 | |
| 231 int SDL_AudioInit(const char *driver_name) | |
| 232 { | |
| 233 SDL_AudioDevice *audio; | |
| 234 int i = 0, idx; | |
| 235 | |
| 236 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 237 if ( current_audio != NULL ) { | |
| 238 SDL_AudioQuit(); | |
| 239 } | |
| 240 | |
| 241 /* Select the proper audio driver */ | |
| 242 audio = NULL; | |
| 243 idx = 0; | |
| 244 #ifdef unix | |
| 245 if ( (driver_name == NULL) && (getenv("ESPEAKER") != NULL) ) { | |
| 246 /* Ahem, we know that if ESPEAKER is set, user probably wants | |
| 247 to use ESD, but don't start it if it's not already running. | |
| 248 This probably isn't the place to do this, but... Shh! :) | |
| 249 */ | |
| 250 for ( i=0; bootstrap[i]; ++i ) { | |
| 251 if ( strcmp(bootstrap[i]->name, "esd") == 0 ) { | |
| 252 const char *esd_no_spawn; | |
| 253 | |
| 254 /* Don't start ESD if it's not running */ | |
| 255 esd_no_spawn = getenv("ESD_NO_SPAWN"); | |
| 256 if ( esd_no_spawn == NULL ) { | |
| 257 putenv("ESD_NO_SPAWN=1"); | |
| 258 } | |
| 259 if ( bootstrap[i]->available() ) { | |
| 260 audio = bootstrap[i]->create(0); | |
| 261 break; | |
| 262 } | |
| 263 #ifdef linux /* No unsetenv() on most platforms */ | |
| 264 if ( esd_no_spawn == NULL ) { | |
| 265 unsetenv("ESD_NO_SPAWN"); | |
| 266 } | |
| 267 #endif | |
| 268 } | |
| 269 } | |
| 270 } | |
| 271 #endif /* unix */ | |
| 272 if ( audio == NULL ) { | |
| 273 if ( driver_name != NULL ) { | |
| 274 #if 0 /* This will be replaced with a better driver selection API */ | |
| 275 if ( strrchr(driver_name, ':') != NULL ) { | |
| 276 idx = atoi(strrchr(driver_name, ':')+1); | |
| 277 } | |
| 278 #endif | |
| 279 for ( i=0; bootstrap[i]; ++i ) { | |
| 280 if (strncmp(bootstrap[i]->name, driver_name, | |
| 281 strlen(bootstrap[i]->name)) == 0) { | |
| 282 if ( bootstrap[i]->available() ) { | |
| 283 audio=bootstrap[i]->create(idx); | |
| 284 break; | |
| 285 } | |
| 286 } | |
| 287 } | |
| 288 } else { | |
| 289 for ( i=0; bootstrap[i]; ++i ) { | |
| 290 if ( bootstrap[i]->available() ) { | |
| 291 audio = bootstrap[i]->create(idx); | |
| 292 if ( audio != NULL ) { | |
| 293 break; | |
| 294 } | |
| 295 } | |
| 296 } | |
| 297 } | |
| 298 if ( audio == NULL ) { | |
| 299 SDL_SetError("No available audio device"); | |
| 300 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 301 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 302 */ | |
| 303 return(-1); | |
| 304 #endif | |
| 305 } | |
| 306 } | |
| 307 current_audio = audio; | |
| 308 if ( current_audio ) { | |
| 309 current_audio->name = bootstrap[i]->name; | |
| 310 } | |
| 311 return(0); | |
| 312 } | |
| 313 | |
| 314 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 315 { | |
| 316 if ( current_audio != NULL ) { | |
| 317 strncpy(namebuf, current_audio->name, maxlen-1); | |
| 318 namebuf[maxlen-1] = '\0'; | |
| 319 return(namebuf); | |
| 320 } | |
| 321 return(NULL); | |
| 322 } | |
| 323 | |
| 324 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 325 { | |
| 326 SDL_AudioDevice *audio; | |
| 327 | |
| 328 /* Start up the audio driver, if necessary */ | |
| 329 if ( ! current_audio ) { | |
| 330 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 331 (current_audio == NULL) ) { | |
| 332 return(-1); | |
| 333 } | |
| 334 } | |
| 335 audio = current_audio; | |
| 336 | |
| 337 /* Verify some parameters */ | |
| 338 if ( desired->callback == NULL ) { | |
| 339 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 340 return(-1); | |
| 341 } | |
| 342 switch ( desired->channels ) { | |
| 343 case 1: /* Mono */ | |
| 344 case 2: /* Stereo */ | |
| 345 break; | |
| 346 default: | |
| 347 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 348 return(-1); | |
| 349 } | |
| 350 | |
| 351 #ifdef macintosh | |
| 352 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ | |
| 353 #else | |
| 354 /* Create a semaphore for locking the sound buffers */ | |
| 355 audio->mixer_lock = SDL_CreateMutex(); | |
| 356 if ( audio->mixer_lock == NULL ) { | |
| 357 SDL_SetError("Couldn't create mixer lock"); | |
| 358 SDL_CloseAudio(); | |
| 359 return(-1); | |
| 360 } | |
| 361 #endif | |
| 362 | |
| 363 /* Calculate the silence and size of the audio specification */ | |
| 364 SDL_CalculateAudioSpec(desired); | |
| 365 | |
| 366 /* Open the audio subsystem */ | |
| 367 memcpy(&audio->spec, desired, sizeof(audio->spec)); | |
| 368 audio->convert.needed = 0; | |
| 369 audio->enabled = 1; | |
| 370 audio->paused = 1; | |
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371 |
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372 #ifndef ENABLE_AHI |
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373 |
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374 /* AmigaOS opens audio inside the main loop */ |
| 0 | 375 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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376 |
| 0 | 377 if ( ! audio->opened ) { |
| 378 SDL_CloseAudio(); | |
| 379 return(-1); | |
| 380 } | |
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381 #else |
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382 D(bug("Locking semaphore...")); |
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383 SDL_mutexP(audio->mixer_lock); |
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384 |
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385 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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386 D(bug("Created thread...\n")); |
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387 |
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388 if ( audio->thread == NULL ) { |
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389 SDL_mutexV(audio->mixer_lock); |
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390 SDL_CloseAudio(); |
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391 SDL_SetError("Couldn't create audio thread"); |
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392 return(-1); |
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393 } |
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394 |
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395 while(!audio_configured) |
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396 SDL_Delay(100); |
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397 #endif |
| 0 | 398 |
| 399 /* If the audio driver changes the buffer size, accept it */ | |
| 400 if ( audio->spec.samples != desired->samples ) { | |
| 401 desired->samples = audio->spec.samples; | |
| 402 SDL_CalculateAudioSpec(desired); | |
| 403 } | |
| 404 | |
| 405 /* Allocate a fake audio memory buffer */ | |
| 406 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 407 if ( audio->fake_stream == NULL ) { | |
| 408 SDL_CloseAudio(); | |
| 409 SDL_OutOfMemory(); | |
| 410 return(-1); | |
| 411 } | |
| 412 | |
| 413 /* See if we need to do any conversion */ | |
| 414 if ( memcmp(desired, &audio->spec, sizeof(audio->spec)) == 0 ) { | |
| 415 /* Just copy over the desired audio specification */ | |
| 416 if ( obtained != NULL ) { | |
| 417 memcpy(obtained, &audio->spec, sizeof(audio->spec)); | |
| 418 } | |
| 419 } else { | |
| 420 /* Copy over the audio specification if possible */ | |
| 421 if ( obtained != NULL ) { | |
| 422 memcpy(obtained, &audio->spec, sizeof(audio->spec)); | |
| 423 } else { | |
| 424 /* Build an audio conversion block */ | |
| 425 if ( SDL_BuildAudioCVT(&audio->convert, | |
| 426 desired->format, desired->channels, | |
| 427 desired->freq, | |
| 428 audio->spec.format, audio->spec.channels, | |
| 429 audio->spec.freq) < 0 ) { | |
| 430 SDL_CloseAudio(); | |
| 431 return(-1); | |
| 432 } | |
| 433 if ( audio->convert.needed ) { | |
| 434 audio->convert.len = desired->size; | |
| 435 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( | |
| 436 audio->convert.len*audio->convert.len_mult); | |
| 437 if ( audio->convert.buf == NULL ) { | |
| 438 SDL_CloseAudio(); | |
| 439 SDL_OutOfMemory(); | |
| 440 return(-1); | |
| 441 } | |
| 442 } | |
| 443 } | |
| 444 } | |
| 445 | |
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446 #ifndef ENABLE_AHI |
| 0 | 447 /* Start the audio thread if necessary */ |
| 448 switch (audio->opened) { | |
| 449 case 1: | |
| 450 /* Start the audio thread */ | |
| 451 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); | |
| 452 if ( audio->thread == NULL ) { | |
| 453 SDL_CloseAudio(); | |
| 454 SDL_SetError("Couldn't create audio thread"); | |
| 455 return(-1); | |
| 456 } | |
| 457 break; | |
| 458 | |
| 459 default: | |
| 460 /* The audio is now playing */ | |
| 461 break; | |
| 462 } | |
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463 #else |
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464 SDL_mutexV(audio->mixer_lock); |
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465 D(bug("SDL_OpenAudio USCITA...\n")); |
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466 |
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467 #endif |
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468 |
| 0 | 469 return(0); |
| 470 } | |
| 471 | |
| 472 SDL_audiostatus SDL_GetAudioStatus(void) | |
| 473 { | |
| 474 SDL_AudioDevice *audio = current_audio; | |
| 475 SDL_audiostatus status; | |
| 476 | |
| 477 status = SDL_AUDIO_STOPPED; | |
| 478 if ( audio && audio->enabled ) { | |
| 479 if ( audio->paused ) { | |
| 480 status = SDL_AUDIO_PAUSED; | |
| 481 } else { | |
| 482 status = SDL_AUDIO_PLAYING; | |
| 483 } | |
| 484 } | |
| 485 return(status); | |
| 486 } | |
| 487 | |
| 488 void SDL_PauseAudio (int pause_on) | |
| 489 { | |
| 490 SDL_AudioDevice *audio = current_audio; | |
| 491 | |
| 492 if ( audio ) { | |
| 493 audio->paused = pause_on; | |
| 494 } | |
| 495 } | |
| 496 | |
| 497 void SDL_LockAudio (void) | |
| 498 { | |
| 499 SDL_AudioDevice *audio = current_audio; | |
| 500 | |
| 501 /* Obtain a lock on the mixing buffers */ | |
| 502 if ( audio ) { | |
| 503 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { | |
| 504 return; | |
| 505 } | |
| 506 SDL_mutexP(audio->mixer_lock); | |
| 507 } | |
| 508 } | |
| 509 | |
| 510 void SDL_UnlockAudio (void) | |
| 511 { | |
| 512 SDL_AudioDevice *audio = current_audio; | |
| 513 | |
| 514 /* Release lock on the mixing buffers */ | |
| 515 if ( audio ) { | |
| 516 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { | |
| 517 return; | |
| 518 } | |
| 519 SDL_mutexV(audio->mixer_lock); | |
| 520 } | |
| 521 } | |
| 522 | |
| 523 void SDL_CloseAudio (void) | |
| 524 { | |
| 525 SDL_QuitSubSystem(SDL_INIT_AUDIO); | |
| 526 } | |
| 527 | |
| 528 void SDL_AudioQuit(void) | |
| 529 { | |
| 530 SDL_AudioDevice *audio = current_audio; | |
| 531 | |
| 532 if ( audio ) { | |
| 533 audio->enabled = 0; | |
| 534 if ( audio->thread != NULL ) { | |
| 535 SDL_WaitThread(audio->thread, NULL); | |
| 536 } | |
| 537 if ( audio->mixer_lock != NULL ) { | |
| 538 SDL_DestroyMutex(audio->mixer_lock); | |
| 539 } | |
| 540 if ( audio->fake_stream != NULL ) { | |
| 541 SDL_FreeAudioMem(audio->fake_stream); | |
| 542 } | |
| 543 if ( audio->convert.needed ) { | |
| 544 SDL_FreeAudioMem(audio->convert.buf); | |
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545 |
| 0 | 546 } |
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547 #ifndef ENABLE_AHI |
| 0 | 548 if ( audio->opened ) { |
| 549 audio->CloseAudio(audio); | |
| 550 audio->opened = 0; | |
| 551 } | |
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552 #endif |
| 0 | 553 /* Free the driver data */ |
| 554 audio->free(audio); | |
| 555 current_audio = NULL; | |
| 556 } | |
| 557 } | |
| 558 | |
| 559 #define NUM_FORMATS 6 | |
| 560 static int format_idx; | |
| 561 static int format_idx_sub; | |
| 562 static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { | |
| 563 { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 564 { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 565 { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 566 { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 567 { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 568 { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 569 }; | |
| 570 | |
| 571 Uint16 SDL_FirstAudioFormat(Uint16 format) | |
| 572 { | |
| 573 for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { | |
| 574 if ( format_list[format_idx][0] == format ) { | |
| 575 break; | |
| 576 } | |
| 577 } | |
| 578 format_idx_sub = 0; | |
| 579 return(SDL_NextAudioFormat()); | |
| 580 } | |
| 581 | |
| 582 Uint16 SDL_NextAudioFormat(void) | |
| 583 { | |
| 584 if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { | |
| 585 return(0); | |
| 586 } | |
| 587 return(format_list[format_idx][format_idx_sub++]); | |
| 588 } | |
| 589 | |
| 590 void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) | |
| 591 { | |
| 592 switch (spec->format) { | |
| 593 case AUDIO_U8: | |
| 594 spec->silence = 0x80; | |
| 595 break; | |
| 596 default: | |
| 597 spec->silence = 0x00; | |
| 598 break; | |
| 599 } | |
| 600 spec->size = (spec->format&0xFF)/8; | |
| 601 spec->size *= spec->channels; | |
| 602 spec->size *= spec->samples; | |
| 603 } |