Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 413:2a1486305412
Hmm
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 13 Jun 2002 16:54:43 +0000 |
| parents | d219b0e02f5f |
| children | dad72daf44b3 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga |
| 0 | 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 MINTAUDIO_SUPPORT |
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87 &MINTAUDIO_bootstrap, |
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88 #endif |
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89 #ifdef DISKAUD_SUPPORT |
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90 &DISKAUD_bootstrap, |
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91 #endif |
| 0 | 92 NULL |
| 93 }; | |
| 94 SDL_AudioDevice *current_audio = NULL; | |
| 95 | |
| 96 /* Various local functions */ | |
| 97 int SDL_AudioInit(const char *driver_name); | |
| 98 void SDL_AudioQuit(void); | |
| 99 | |
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100 #ifdef ENABLE_AHI |
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101 static int audio_configured = 0; |
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102 #endif |
| 0 | 103 |
| 104 /* The general mixing thread function */ | |
| 105 int SDL_RunAudio(void *audiop) | |
| 106 { | |
| 107 SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; | |
| 108 Uint8 *stream; | |
| 109 int stream_len; | |
| 110 void *udata; | |
| 111 void (*fill)(void *userdata,Uint8 *stream, int len); | |
| 112 int silence; | |
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113 #ifdef ENABLE_AHI |
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114 int started = 0; |
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115 |
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116 /* AmigaOS NEEDS that the audio driver is opened in the thread that uses it! */ |
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117 |
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118 D(bug("Task audio started audio struct:<%lx>...\n",audiop)); |
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119 |
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120 D(bug("Before Openaudio...")); |
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121 if(audio->OpenAudio(audio, &audio->spec)==-1) |
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122 { |
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123 D(bug("Open audio failed...\n")); |
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124 return(-1); |
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125 } |
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126 D(bug("OpenAudio...OK\n")); |
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127 #endif |
| 0 | 128 |
| 129 /* Perform any thread setup */ | |
| 130 if ( audio->ThreadInit ) { | |
| 131 audio->ThreadInit(audio); | |
| 132 } | |
| 133 audio->threadid = SDL_ThreadID(); | |
| 134 | |
| 135 /* Set up the mixing function */ | |
| 136 fill = audio->spec.callback; | |
| 137 udata = audio->spec.userdata; | |
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138 |
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139 #ifdef ENABLE_AHI |
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140 audio_configured = 1; |
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141 |
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142 D(bug("Audio configured... Checking for conversion\n")); |
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143 SDL_mutexP(audio->mixer_lock); |
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144 D(bug("Semaphore obtained...\n")); |
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145 #endif |
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146 |
| 0 | 147 if ( audio->convert.needed ) { |
| 148 if ( audio->convert.src_format == AUDIO_U8 ) { | |
| 149 silence = 0x80; | |
| 150 } else { | |
| 151 silence = 0; | |
| 152 } | |
| 153 stream_len = audio->convert.len; | |
| 154 } else { | |
| 155 silence = audio->spec.silence; | |
| 156 stream_len = audio->spec.size; | |
| 157 } | |
| 158 stream = audio->fake_stream; | |
| 159 | |
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160 #ifdef ENABLE_AHI |
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161 SDL_mutexV(audio->mixer_lock); |
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162 D(bug("Entering audio loop...\n")); |
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163 #endif |
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164 |
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165 |
| 0 | 166 /* Loop, filling the audio buffers */ |
| 167 while ( audio->enabled ) { | |
| 168 | |
| 169 /* Wait for new current buffer to finish playing */ | |
| 170 if ( stream == audio->fake_stream ) { | |
| 171 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); | |
| 172 } else { | |
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173 #ifdef ENABLE_AHI |
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174 if ( started > 1 ) |
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175 #endif |
| 0 | 176 audio->WaitAudio(audio); |
| 177 } | |
| 178 | |
| 179 /* Fill the current buffer with sound */ | |
| 180 if ( audio->convert.needed ) { | |
| 181 if ( audio->convert.buf ) { | |
| 182 stream = audio->convert.buf; | |
| 183 } else { | |
| 184 continue; | |
| 185 } | |
| 186 } else { | |
| 187 stream = audio->GetAudioBuf(audio); | |
| 188 if ( stream == NULL ) { | |
| 189 stream = audio->fake_stream; | |
| 190 } | |
| 191 } | |
| 192 memset(stream, silence, stream_len); | |
| 193 | |
| 194 if ( ! audio->paused ) { | |
| 195 SDL_mutexP(audio->mixer_lock); | |
| 196 (*fill)(udata, stream, stream_len); | |
| 197 SDL_mutexV(audio->mixer_lock); | |
| 198 } | |
| 199 | |
| 200 /* Convert the audio if necessary */ | |
| 201 if ( audio->convert.needed ) { | |
| 202 SDL_ConvertAudio(&audio->convert); | |
| 203 stream = audio->GetAudioBuf(audio); | |
| 204 if ( stream == NULL ) { | |
| 205 stream = audio->fake_stream; | |
| 206 } | |
| 207 memcpy(stream, audio->convert.buf, | |
| 208 audio->convert.len_cvt); | |
| 209 } | |
| 210 | |
| 211 /* Ready current buffer for play and change current buffer */ | |
| 212 if ( stream != audio->fake_stream ) { | |
| 213 audio->PlayAudio(audio); | |
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214 #ifdef ENABLE_AHI |
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215 /* AmigaOS don't have to wait the first time audio is played! */ |
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216 started++; |
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217 #endif |
| 0 | 218 } |
| 219 } | |
| 220 /* Wait for the audio to drain.. */ | |
| 221 if ( audio->WaitDone ) { | |
| 222 audio->WaitDone(audio); | |
| 223 } | |
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224 |
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225 #ifdef ENABLE_AHI |
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226 D(bug("WaitAudio...Done\n")); |
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227 |
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228 audio->CloseAudio(audio); |
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229 |
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230 D(bug("CloseAudio..Done, subtask exiting...\n")); |
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231 audio_configured = 0; |
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232 #endif |
| 0 | 233 return(0); |
| 234 } | |
| 235 | |
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236 static void SDL_LockAudio_Default(SDL_AudioDevice *audio) |
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237 { |
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238 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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239 return; |
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240 } |
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241 SDL_mutexP(audio->mixer_lock); |
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242 } |
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243 |
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244 static void SDL_UnlockAudio_Default(SDL_AudioDevice *audio) |
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245 { |
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246 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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247 return; |
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248 } |
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249 SDL_mutexV(audio->mixer_lock); |
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250 } |
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251 |
| 0 | 252 int SDL_AudioInit(const char *driver_name) |
| 253 { | |
| 254 SDL_AudioDevice *audio; | |
| 255 int i = 0, idx; | |
| 256 | |
| 257 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 258 if ( current_audio != NULL ) { | |
| 259 SDL_AudioQuit(); | |
| 260 } | |
| 261 | |
| 262 /* Select the proper audio driver */ | |
| 263 audio = NULL; | |
| 264 idx = 0; | |
| 265 #ifdef unix | |
| 266 if ( (driver_name == NULL) && (getenv("ESPEAKER") != NULL) ) { | |
| 267 /* Ahem, we know that if ESPEAKER is set, user probably wants | |
| 268 to use ESD, but don't start it if it's not already running. | |
| 269 This probably isn't the place to do this, but... Shh! :) | |
| 270 */ | |
| 271 for ( i=0; bootstrap[i]; ++i ) { | |
| 272 if ( strcmp(bootstrap[i]->name, "esd") == 0 ) { | |
| 273 const char *esd_no_spawn; | |
| 274 | |
| 275 /* Don't start ESD if it's not running */ | |
| 276 esd_no_spawn = getenv("ESD_NO_SPAWN"); | |
| 277 if ( esd_no_spawn == NULL ) { | |
| 278 putenv("ESD_NO_SPAWN=1"); | |
| 279 } | |
| 280 if ( bootstrap[i]->available() ) { | |
| 281 audio = bootstrap[i]->create(0); | |
| 282 break; | |
| 283 } | |
| 284 #ifdef linux /* No unsetenv() on most platforms */ | |
| 285 if ( esd_no_spawn == NULL ) { | |
| 286 unsetenv("ESD_NO_SPAWN"); | |
| 287 } | |
| 288 #endif | |
| 289 } | |
| 290 } | |
| 291 } | |
| 292 #endif /* unix */ | |
| 293 if ( audio == NULL ) { | |
| 294 if ( driver_name != NULL ) { | |
| 295 #if 0 /* This will be replaced with a better driver selection API */ | |
| 296 if ( strrchr(driver_name, ':') != NULL ) { | |
| 297 idx = atoi(strrchr(driver_name, ':')+1); | |
| 298 } | |
| 299 #endif | |
| 300 for ( i=0; bootstrap[i]; ++i ) { | |
| 301 if (strncmp(bootstrap[i]->name, driver_name, | |
| 302 strlen(bootstrap[i]->name)) == 0) { | |
| 303 if ( bootstrap[i]->available() ) { | |
| 304 audio=bootstrap[i]->create(idx); | |
| 305 break; | |
| 306 } | |
| 307 } | |
| 308 } | |
| 309 } else { | |
| 310 for ( i=0; bootstrap[i]; ++i ) { | |
| 311 if ( bootstrap[i]->available() ) { | |
| 312 audio = bootstrap[i]->create(idx); | |
| 313 if ( audio != NULL ) { | |
| 314 break; | |
| 315 } | |
| 316 } | |
| 317 } | |
| 318 } | |
| 319 if ( audio == NULL ) { | |
| 320 SDL_SetError("No available audio device"); | |
| 321 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 322 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 323 */ | |
| 324 return(-1); | |
| 325 #endif | |
| 326 } | |
| 327 } | |
| 328 current_audio = audio; | |
| 329 if ( current_audio ) { | |
| 330 current_audio->name = bootstrap[i]->name; | |
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331 if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
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332 current_audio->LockAudio = SDL_LockAudio_Default; |
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333 current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
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334 } |
| 0 | 335 } |
| 336 return(0); | |
| 337 } | |
| 338 | |
| 339 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 340 { | |
| 341 if ( current_audio != NULL ) { | |
| 342 strncpy(namebuf, current_audio->name, maxlen-1); | |
| 343 namebuf[maxlen-1] = '\0'; | |
| 344 return(namebuf); | |
| 345 } | |
| 346 return(NULL); | |
| 347 } | |
| 348 | |
| 349 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 350 { | |
| 351 SDL_AudioDevice *audio; | |
| 352 | |
| 353 /* Start up the audio driver, if necessary */ | |
| 354 if ( ! current_audio ) { | |
| 355 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 356 (current_audio == NULL) ) { | |
| 357 return(-1); | |
| 358 } | |
| 359 } | |
| 360 audio = current_audio; | |
| 361 | |
|
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362 if (audio->opened) { |
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363 SDL_SetError("Audio device is already opened"); |
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364 return(-1); |
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365 } |
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366 |
| 0 | 367 /* Verify some parameters */ |
| 368 if ( desired->callback == NULL ) { | |
| 369 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 370 return(-1); | |
| 371 } | |
| 372 switch ( desired->channels ) { | |
| 373 case 1: /* Mono */ | |
| 374 case 2: /* Stereo */ | |
| 375 break; | |
| 376 default: | |
| 377 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 378 return(-1); | |
| 379 } | |
| 380 | |
| 381 #ifdef macintosh | |
| 382 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ | |
| 383 #else | |
|
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384 #if defined(__MINT__) && !defined(ENABLE_THREADS) |
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385 /* Uses interrupt driven audio, without thread */ |
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386 #else |
| 0 | 387 /* Create a semaphore for locking the sound buffers */ |
| 388 audio->mixer_lock = SDL_CreateMutex(); | |
| 389 if ( audio->mixer_lock == NULL ) { | |
| 390 SDL_SetError("Couldn't create mixer lock"); | |
| 391 SDL_CloseAudio(); | |
| 392 return(-1); | |
| 393 } | |
|
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394 #endif /* __MINT__ */ |
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395 #endif /* macintosh */ |
| 0 | 396 |
| 397 /* Calculate the silence and size of the audio specification */ | |
| 398 SDL_CalculateAudioSpec(desired); | |
| 399 | |
| 400 /* Open the audio subsystem */ | |
| 401 memcpy(&audio->spec, desired, sizeof(audio->spec)); | |
| 402 audio->convert.needed = 0; | |
| 403 audio->enabled = 1; | |
| 404 audio->paused = 1; | |
|
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405 |
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406 #ifndef ENABLE_AHI |
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407 |
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408 /* AmigaOS opens audio inside the main loop */ |
| 0 | 409 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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410 |
| 0 | 411 if ( ! audio->opened ) { |
| 412 SDL_CloseAudio(); | |
| 413 return(-1); | |
| 414 } | |
|
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415 #else |
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416 D(bug("Locking semaphore...")); |
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417 SDL_mutexP(audio->mixer_lock); |
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418 |
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419 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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420 D(bug("Created thread...\n")); |
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421 |
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422 if ( audio->thread == NULL ) { |
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423 SDL_mutexV(audio->mixer_lock); |
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424 SDL_CloseAudio(); |
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425 SDL_SetError("Couldn't create audio thread"); |
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426 return(-1); |
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427 } |
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428 |
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429 while(!audio_configured) |
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430 SDL_Delay(100); |
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431 #endif |
| 0 | 432 |
| 433 /* If the audio driver changes the buffer size, accept it */ | |
| 434 if ( audio->spec.samples != desired->samples ) { | |
| 435 desired->samples = audio->spec.samples; | |
| 436 SDL_CalculateAudioSpec(desired); | |
| 437 } | |
| 438 | |
| 439 /* Allocate a fake audio memory buffer */ | |
| 440 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 441 if ( audio->fake_stream == NULL ) { | |
| 442 SDL_CloseAudio(); | |
| 443 SDL_OutOfMemory(); | |
| 444 return(-1); | |
| 445 } | |
| 446 | |
| 447 /* See if we need to do any conversion */ | |
| 448 if ( memcmp(desired, &audio->spec, sizeof(audio->spec)) == 0 ) { | |
| 449 /* Just copy over the desired audio specification */ | |
| 450 if ( obtained != NULL ) { | |
| 451 memcpy(obtained, &audio->spec, sizeof(audio->spec)); | |
| 452 } | |
| 453 } else { | |
| 454 /* Copy over the audio specification if possible */ | |
| 455 if ( obtained != NULL ) { | |
| 456 memcpy(obtained, &audio->spec, sizeof(audio->spec)); | |
| 457 } else { | |
| 458 /* Build an audio conversion block */ | |
| 459 if ( SDL_BuildAudioCVT(&audio->convert, | |
| 460 desired->format, desired->channels, | |
| 461 desired->freq, | |
| 462 audio->spec.format, audio->spec.channels, | |
| 463 audio->spec.freq) < 0 ) { | |
| 464 SDL_CloseAudio(); | |
| 465 return(-1); | |
| 466 } | |
| 467 if ( audio->convert.needed ) { | |
| 468 audio->convert.len = desired->size; | |
| 469 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( | |
| 470 audio->convert.len*audio->convert.len_mult); | |
| 471 if ( audio->convert.buf == NULL ) { | |
| 472 SDL_CloseAudio(); | |
| 473 SDL_OutOfMemory(); | |
| 474 return(-1); | |
| 475 } | |
| 476 } | |
| 477 } | |
| 478 } | |
| 479 | |
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480 #ifndef ENABLE_AHI |
| 0 | 481 /* Start the audio thread if necessary */ |
| 482 switch (audio->opened) { | |
| 483 case 1: | |
| 484 /* Start the audio thread */ | |
| 485 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); | |
| 486 if ( audio->thread == NULL ) { | |
| 487 SDL_CloseAudio(); | |
| 488 SDL_SetError("Couldn't create audio thread"); | |
| 489 return(-1); | |
| 490 } | |
| 491 break; | |
| 492 | |
| 493 default: | |
| 494 /* The audio is now playing */ | |
| 495 break; | |
| 496 } | |
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497 #else |
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498 SDL_mutexV(audio->mixer_lock); |
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499 D(bug("SDL_OpenAudio USCITA...\n")); |
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500 |
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501 #endif |
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502 |
| 0 | 503 return(0); |
| 504 } | |
| 505 | |
| 506 SDL_audiostatus SDL_GetAudioStatus(void) | |
| 507 { | |
| 508 SDL_AudioDevice *audio = current_audio; | |
| 509 SDL_audiostatus status; | |
| 510 | |
| 511 status = SDL_AUDIO_STOPPED; | |
| 512 if ( audio && audio->enabled ) { | |
| 513 if ( audio->paused ) { | |
| 514 status = SDL_AUDIO_PAUSED; | |
| 515 } else { | |
| 516 status = SDL_AUDIO_PLAYING; | |
| 517 } | |
| 518 } | |
| 519 return(status); | |
| 520 } | |
| 521 | |
| 522 void SDL_PauseAudio (int pause_on) | |
| 523 { | |
| 524 SDL_AudioDevice *audio = current_audio; | |
| 525 | |
| 526 if ( audio ) { | |
| 527 audio->paused = pause_on; | |
| 528 } | |
| 529 } | |
| 530 | |
| 531 void SDL_LockAudio (void) | |
| 532 { | |
| 533 SDL_AudioDevice *audio = current_audio; | |
| 534 | |
| 535 /* Obtain a lock on the mixing buffers */ | |
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536 if ( audio && audio->LockAudio ) { |
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537 audio->LockAudio(audio); |
| 0 | 538 } |
| 539 } | |
| 540 | |
| 541 void SDL_UnlockAudio (void) | |
| 542 { | |
| 543 SDL_AudioDevice *audio = current_audio; | |
| 544 | |
| 545 /* Release lock on the mixing buffers */ | |
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546 if ( audio && audio->UnlockAudio ) { |
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547 audio->UnlockAudio(audio); |
| 0 | 548 } |
| 549 } | |
| 550 | |
| 551 void SDL_CloseAudio (void) | |
| 552 { | |
| 553 SDL_QuitSubSystem(SDL_INIT_AUDIO); | |
| 554 } | |
| 555 | |
| 556 void SDL_AudioQuit(void) | |
| 557 { | |
| 558 SDL_AudioDevice *audio = current_audio; | |
| 559 | |
| 560 if ( audio ) { | |
| 561 audio->enabled = 0; | |
| 562 if ( audio->thread != NULL ) { | |
| 563 SDL_WaitThread(audio->thread, NULL); | |
| 564 } | |
| 565 if ( audio->mixer_lock != NULL ) { | |
| 566 SDL_DestroyMutex(audio->mixer_lock); | |
| 567 } | |
| 568 if ( audio->fake_stream != NULL ) { | |
| 569 SDL_FreeAudioMem(audio->fake_stream); | |
| 570 } | |
| 571 if ( audio->convert.needed ) { | |
| 572 SDL_FreeAudioMem(audio->convert.buf); | |
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573 |
| 0 | 574 } |
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575 #ifndef ENABLE_AHI |
| 0 | 576 if ( audio->opened ) { |
| 577 audio->CloseAudio(audio); | |
| 578 audio->opened = 0; | |
| 579 } | |
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580 #endif |
| 0 | 581 /* Free the driver data */ |
| 582 audio->free(audio); | |
| 583 current_audio = NULL; | |
| 584 } | |
| 585 } | |
| 586 | |
| 587 #define NUM_FORMATS 6 | |
| 588 static int format_idx; | |
| 589 static int format_idx_sub; | |
| 590 static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { | |
| 591 { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 592 { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 593 { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 594 { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 595 { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 596 { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 597 }; | |
| 598 | |
| 599 Uint16 SDL_FirstAudioFormat(Uint16 format) | |
| 600 { | |
| 601 for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { | |
| 602 if ( format_list[format_idx][0] == format ) { | |
| 603 break; | |
| 604 } | |
| 605 } | |
| 606 format_idx_sub = 0; | |
| 607 return(SDL_NextAudioFormat()); | |
| 608 } | |
| 609 | |
| 610 Uint16 SDL_NextAudioFormat(void) | |
| 611 { | |
| 612 if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { | |
| 613 return(0); | |
| 614 } | |
| 615 return(format_list[format_idx][format_idx_sub++]); | |
| 616 } | |
| 617 | |
| 618 void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) | |
| 619 { | |
| 620 switch (spec->format) { | |
| 621 case AUDIO_U8: | |
| 622 spec->silence = 0x80; | |
| 623 break; | |
| 624 default: | |
| 625 spec->silence = 0x00; | |
| 626 break; | |
| 627 } | |
| 628 spec->size = (spec->format&0xFF)/8; | |
| 629 spec->size *= spec->channels; | |
| 630 spec->size *= spec->samples; | |
| 631 } |