Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 515:230b156829ed release-1.2.5
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 06 Oct 2002 20:31:34 +0000 |
| parents | dad72daf44b3 |
| children | 550bccdf04bd |
| 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 |
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92 #ifdef ENABLE_DC |
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93 &DCAUD_bootstrap, |
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94 #endif |
| 0 | 95 NULL |
| 96 }; | |
| 97 SDL_AudioDevice *current_audio = NULL; | |
| 98 | |
| 99 /* Various local functions */ | |
| 100 int SDL_AudioInit(const char *driver_name); | |
| 101 void SDL_AudioQuit(void); | |
| 102 | |
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103 #ifdef ENABLE_AHI |
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104 static int audio_configured = 0; |
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105 #endif |
| 0 | 106 |
| 107 /* The general mixing thread function */ | |
| 108 int SDL_RunAudio(void *audiop) | |
| 109 { | |
| 110 SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; | |
| 111 Uint8 *stream; | |
| 112 int stream_len; | |
| 113 void *udata; | |
| 114 void (*fill)(void *userdata,Uint8 *stream, int len); | |
| 115 int silence; | |
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116 #ifdef ENABLE_AHI |
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117 int started = 0; |
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118 |
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119 /* AmigaOS NEEDS that the audio driver is opened in the thread that uses it! */ |
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120 |
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121 D(bug("Task audio started audio struct:<%lx>...\n",audiop)); |
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122 |
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123 D(bug("Before Openaudio...")); |
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124 if(audio->OpenAudio(audio, &audio->spec)==-1) |
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125 { |
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126 D(bug("Open audio failed...\n")); |
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127 return(-1); |
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128 } |
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129 D(bug("OpenAudio...OK\n")); |
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130 #endif |
| 0 | 131 |
| 132 /* Perform any thread setup */ | |
| 133 if ( audio->ThreadInit ) { | |
| 134 audio->ThreadInit(audio); | |
| 135 } | |
| 136 audio->threadid = SDL_ThreadID(); | |
| 137 | |
| 138 /* Set up the mixing function */ | |
| 139 fill = audio->spec.callback; | |
| 140 udata = audio->spec.userdata; | |
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141 |
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142 #ifdef ENABLE_AHI |
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143 audio_configured = 1; |
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144 |
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145 D(bug("Audio configured... Checking for conversion\n")); |
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146 SDL_mutexP(audio->mixer_lock); |
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147 D(bug("Semaphore obtained...\n")); |
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148 #endif |
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149 |
| 0 | 150 if ( audio->convert.needed ) { |
| 151 if ( audio->convert.src_format == AUDIO_U8 ) { | |
| 152 silence = 0x80; | |
| 153 } else { | |
| 154 silence = 0; | |
| 155 } | |
| 156 stream_len = audio->convert.len; | |
| 157 } else { | |
| 158 silence = audio->spec.silence; | |
| 159 stream_len = audio->spec.size; | |
| 160 } | |
| 161 stream = audio->fake_stream; | |
| 162 | |
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163 #ifdef ENABLE_AHI |
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164 SDL_mutexV(audio->mixer_lock); |
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165 D(bug("Entering audio loop...\n")); |
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166 #endif |
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167 |
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168 |
| 0 | 169 /* Loop, filling the audio buffers */ |
| 170 while ( audio->enabled ) { | |
| 171 | |
| 172 /* Wait for new current buffer to finish playing */ | |
| 173 if ( stream == audio->fake_stream ) { | |
| 174 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); | |
| 175 } else { | |
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176 #ifdef ENABLE_AHI |
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177 if ( started > 1 ) |
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178 #endif |
| 0 | 179 audio->WaitAudio(audio); |
| 180 } | |
| 181 | |
| 182 /* Fill the current buffer with sound */ | |
| 183 if ( audio->convert.needed ) { | |
| 184 if ( audio->convert.buf ) { | |
| 185 stream = audio->convert.buf; | |
| 186 } else { | |
| 187 continue; | |
| 188 } | |
| 189 } else { | |
| 190 stream = audio->GetAudioBuf(audio); | |
| 191 if ( stream == NULL ) { | |
| 192 stream = audio->fake_stream; | |
| 193 } | |
| 194 } | |
| 195 memset(stream, silence, stream_len); | |
| 196 | |
| 197 if ( ! audio->paused ) { | |
| 198 SDL_mutexP(audio->mixer_lock); | |
| 199 (*fill)(udata, stream, stream_len); | |
| 200 SDL_mutexV(audio->mixer_lock); | |
| 201 } | |
| 202 | |
| 203 /* Convert the audio if necessary */ | |
| 204 if ( audio->convert.needed ) { | |
| 205 SDL_ConvertAudio(&audio->convert); | |
| 206 stream = audio->GetAudioBuf(audio); | |
| 207 if ( stream == NULL ) { | |
| 208 stream = audio->fake_stream; | |
| 209 } | |
| 210 memcpy(stream, audio->convert.buf, | |
| 211 audio->convert.len_cvt); | |
| 212 } | |
| 213 | |
| 214 /* Ready current buffer for play and change current buffer */ | |
| 215 if ( stream != audio->fake_stream ) { | |
| 216 audio->PlayAudio(audio); | |
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217 #ifdef ENABLE_AHI |
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218 /* AmigaOS don't have to wait the first time audio is played! */ |
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219 started++; |
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220 #endif |
| 0 | 221 } |
| 222 } | |
| 223 /* Wait for the audio to drain.. */ | |
| 224 if ( audio->WaitDone ) { | |
| 225 audio->WaitDone(audio); | |
| 226 } | |
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227 |
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228 #ifdef ENABLE_AHI |
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229 D(bug("WaitAudio...Done\n")); |
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230 |
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231 audio->CloseAudio(audio); |
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232 |
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233 D(bug("CloseAudio..Done, subtask exiting...\n")); |
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234 audio_configured = 0; |
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235 #endif |
| 0 | 236 return(0); |
| 237 } | |
| 238 | |
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239 static void SDL_LockAudio_Default(SDL_AudioDevice *audio) |
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240 { |
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241 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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242 return; |
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243 } |
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244 SDL_mutexP(audio->mixer_lock); |
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245 } |
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246 |
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247 static void SDL_UnlockAudio_Default(SDL_AudioDevice *audio) |
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248 { |
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249 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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250 return; |
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251 } |
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252 SDL_mutexV(audio->mixer_lock); |
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253 } |
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254 |
| 0 | 255 int SDL_AudioInit(const char *driver_name) |
| 256 { | |
| 257 SDL_AudioDevice *audio; | |
| 258 int i = 0, idx; | |
| 259 | |
| 260 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 261 if ( current_audio != NULL ) { | |
| 262 SDL_AudioQuit(); | |
| 263 } | |
| 264 | |
| 265 /* Select the proper audio driver */ | |
| 266 audio = NULL; | |
| 267 idx = 0; | |
| 268 #ifdef unix | |
| 269 if ( (driver_name == NULL) && (getenv("ESPEAKER") != NULL) ) { | |
| 270 /* Ahem, we know that if ESPEAKER is set, user probably wants | |
| 271 to use ESD, but don't start it if it's not already running. | |
| 272 This probably isn't the place to do this, but... Shh! :) | |
| 273 */ | |
| 274 for ( i=0; bootstrap[i]; ++i ) { | |
| 275 if ( strcmp(bootstrap[i]->name, "esd") == 0 ) { | |
| 276 const char *esd_no_spawn; | |
| 277 | |
| 278 /* Don't start ESD if it's not running */ | |
| 279 esd_no_spawn = getenv("ESD_NO_SPAWN"); | |
| 280 if ( esd_no_spawn == NULL ) { | |
| 281 putenv("ESD_NO_SPAWN=1"); | |
| 282 } | |
| 283 if ( bootstrap[i]->available() ) { | |
| 284 audio = bootstrap[i]->create(0); | |
| 285 break; | |
| 286 } | |
| 287 #ifdef linux /* No unsetenv() on most platforms */ | |
| 288 if ( esd_no_spawn == NULL ) { | |
| 289 unsetenv("ESD_NO_SPAWN"); | |
| 290 } | |
| 291 #endif | |
| 292 } | |
| 293 } | |
| 294 } | |
| 295 #endif /* unix */ | |
| 296 if ( audio == NULL ) { | |
| 297 if ( driver_name != NULL ) { | |
| 298 #if 0 /* This will be replaced with a better driver selection API */ | |
| 299 if ( strrchr(driver_name, ':') != NULL ) { | |
| 300 idx = atoi(strrchr(driver_name, ':')+1); | |
| 301 } | |
| 302 #endif | |
| 303 for ( i=0; bootstrap[i]; ++i ) { | |
| 304 if (strncmp(bootstrap[i]->name, driver_name, | |
| 305 strlen(bootstrap[i]->name)) == 0) { | |
| 306 if ( bootstrap[i]->available() ) { | |
| 307 audio=bootstrap[i]->create(idx); | |
| 308 break; | |
| 309 } | |
| 310 } | |
| 311 } | |
| 312 } else { | |
| 313 for ( i=0; bootstrap[i]; ++i ) { | |
| 314 if ( bootstrap[i]->available() ) { | |
| 315 audio = bootstrap[i]->create(idx); | |
| 316 if ( audio != NULL ) { | |
| 317 break; | |
| 318 } | |
| 319 } | |
| 320 } | |
| 321 } | |
| 322 if ( audio == NULL ) { | |
| 323 SDL_SetError("No available audio device"); | |
| 324 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 325 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 326 */ | |
| 327 return(-1); | |
| 328 #endif | |
| 329 } | |
| 330 } | |
| 331 current_audio = audio; | |
| 332 if ( current_audio ) { | |
| 333 current_audio->name = bootstrap[i]->name; | |
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334 if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
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335 current_audio->LockAudio = SDL_LockAudio_Default; |
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336 current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
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337 } |
| 0 | 338 } |
| 339 return(0); | |
| 340 } | |
| 341 | |
| 342 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 343 { | |
| 344 if ( current_audio != NULL ) { | |
| 345 strncpy(namebuf, current_audio->name, maxlen-1); | |
| 346 namebuf[maxlen-1] = '\0'; | |
| 347 return(namebuf); | |
| 348 } | |
| 349 return(NULL); | |
| 350 } | |
| 351 | |
| 352 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 353 { | |
| 354 SDL_AudioDevice *audio; | |
| 355 | |
| 356 /* Start up the audio driver, if necessary */ | |
| 357 if ( ! current_audio ) { | |
| 358 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 359 (current_audio == NULL) ) { | |
| 360 return(-1); | |
| 361 } | |
| 362 } | |
| 363 audio = current_audio; | |
| 364 | |
|
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365 if (audio->opened) { |
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366 SDL_SetError("Audio device is already opened"); |
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367 return(-1); |
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368 } |
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369 |
| 0 | 370 /* Verify some parameters */ |
| 371 if ( desired->callback == NULL ) { | |
| 372 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 373 return(-1); | |
| 374 } | |
| 375 switch ( desired->channels ) { | |
| 376 case 1: /* Mono */ | |
| 377 case 2: /* Stereo */ | |
| 378 break; | |
| 379 default: | |
| 380 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 381 return(-1); | |
| 382 } | |
| 383 | |
| 384 #ifdef macintosh | |
| 385 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ | |
| 386 #else | |
|
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387 #if defined(__MINT__) && !defined(ENABLE_THREADS) |
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388 /* Uses interrupt driven audio, without thread */ |
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389 #else |
| 0 | 390 /* Create a semaphore for locking the sound buffers */ |
| 391 audio->mixer_lock = SDL_CreateMutex(); | |
| 392 if ( audio->mixer_lock == NULL ) { | |
| 393 SDL_SetError("Couldn't create mixer lock"); | |
| 394 SDL_CloseAudio(); | |
| 395 return(-1); | |
| 396 } | |
|
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397 #endif /* __MINT__ */ |
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398 #endif /* macintosh */ |
| 0 | 399 |
| 400 /* Calculate the silence and size of the audio specification */ | |
| 401 SDL_CalculateAudioSpec(desired); | |
| 402 | |
| 403 /* Open the audio subsystem */ | |
| 404 memcpy(&audio->spec, desired, sizeof(audio->spec)); | |
| 405 audio->convert.needed = 0; | |
| 406 audio->enabled = 1; | |
| 407 audio->paused = 1; | |
|
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408 |
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409 #ifndef ENABLE_AHI |
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410 |
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411 /* AmigaOS opens audio inside the main loop */ |
| 0 | 412 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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413 |
| 0 | 414 if ( ! audio->opened ) { |
| 415 SDL_CloseAudio(); | |
| 416 return(-1); | |
| 417 } | |
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418 #else |
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419 D(bug("Locking semaphore...")); |
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420 SDL_mutexP(audio->mixer_lock); |
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421 |
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422 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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423 D(bug("Created thread...\n")); |
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424 |
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425 if ( audio->thread == NULL ) { |
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426 SDL_mutexV(audio->mixer_lock); |
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427 SDL_CloseAudio(); |
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428 SDL_SetError("Couldn't create audio thread"); |
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429 return(-1); |
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430 } |
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431 |
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432 while(!audio_configured) |
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433 SDL_Delay(100); |
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434 #endif |
| 0 | 435 |
| 436 /* If the audio driver changes the buffer size, accept it */ | |
| 437 if ( audio->spec.samples != desired->samples ) { | |
| 438 desired->samples = audio->spec.samples; | |
| 439 SDL_CalculateAudioSpec(desired); | |
| 440 } | |
| 441 | |
| 442 /* Allocate a fake audio memory buffer */ | |
| 443 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 444 if ( audio->fake_stream == NULL ) { | |
| 445 SDL_CloseAudio(); | |
| 446 SDL_OutOfMemory(); | |
| 447 return(-1); | |
| 448 } | |
| 449 | |
| 450 /* See if we need to do any conversion */ | |
| 451 if ( memcmp(desired, &audio->spec, sizeof(audio->spec)) == 0 ) { | |
| 452 /* Just copy over the desired audio specification */ | |
| 453 if ( obtained != NULL ) { | |
| 454 memcpy(obtained, &audio->spec, sizeof(audio->spec)); | |
| 455 } | |
| 456 } else { | |
| 457 /* Copy over the audio specification if possible */ | |
| 458 if ( obtained != NULL ) { | |
| 459 memcpy(obtained, &audio->spec, sizeof(audio->spec)); | |
| 460 } else { | |
| 461 /* Build an audio conversion block */ | |
| 462 if ( SDL_BuildAudioCVT(&audio->convert, | |
| 463 desired->format, desired->channels, | |
| 464 desired->freq, | |
| 465 audio->spec.format, audio->spec.channels, | |
| 466 audio->spec.freq) < 0 ) { | |
| 467 SDL_CloseAudio(); | |
| 468 return(-1); | |
| 469 } | |
| 470 if ( audio->convert.needed ) { | |
| 471 audio->convert.len = desired->size; | |
| 472 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( | |
| 473 audio->convert.len*audio->convert.len_mult); | |
| 474 if ( audio->convert.buf == NULL ) { | |
| 475 SDL_CloseAudio(); | |
| 476 SDL_OutOfMemory(); | |
| 477 return(-1); | |
| 478 } | |
| 479 } | |
| 480 } | |
| 481 } | |
| 482 | |
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483 #ifndef ENABLE_AHI |
| 0 | 484 /* Start the audio thread if necessary */ |
| 485 switch (audio->opened) { | |
| 486 case 1: | |
| 487 /* Start the audio thread */ | |
| 488 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); | |
| 489 if ( audio->thread == NULL ) { | |
| 490 SDL_CloseAudio(); | |
| 491 SDL_SetError("Couldn't create audio thread"); | |
| 492 return(-1); | |
| 493 } | |
| 494 break; | |
| 495 | |
| 496 default: | |
| 497 /* The audio is now playing */ | |
| 498 break; | |
| 499 } | |
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500 #else |
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501 SDL_mutexV(audio->mixer_lock); |
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502 D(bug("SDL_OpenAudio USCITA...\n")); |
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503 |
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504 #endif |
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505 |
| 0 | 506 return(0); |
| 507 } | |
| 508 | |
| 509 SDL_audiostatus SDL_GetAudioStatus(void) | |
| 510 { | |
| 511 SDL_AudioDevice *audio = current_audio; | |
| 512 SDL_audiostatus status; | |
| 513 | |
| 514 status = SDL_AUDIO_STOPPED; | |
| 515 if ( audio && audio->enabled ) { | |
| 516 if ( audio->paused ) { | |
| 517 status = SDL_AUDIO_PAUSED; | |
| 518 } else { | |
| 519 status = SDL_AUDIO_PLAYING; | |
| 520 } | |
| 521 } | |
| 522 return(status); | |
| 523 } | |
| 524 | |
| 525 void SDL_PauseAudio (int pause_on) | |
| 526 { | |
| 527 SDL_AudioDevice *audio = current_audio; | |
| 528 | |
| 529 if ( audio ) { | |
| 530 audio->paused = pause_on; | |
| 531 } | |
| 532 } | |
| 533 | |
| 534 void SDL_LockAudio (void) | |
| 535 { | |
| 536 SDL_AudioDevice *audio = current_audio; | |
| 537 | |
| 538 /* Obtain a lock on the mixing buffers */ | |
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539 if ( audio && audio->LockAudio ) { |
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540 audio->LockAudio(audio); |
| 0 | 541 } |
| 542 } | |
| 543 | |
| 544 void SDL_UnlockAudio (void) | |
| 545 { | |
| 546 SDL_AudioDevice *audio = current_audio; | |
| 547 | |
| 548 /* Release lock on the mixing buffers */ | |
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549 if ( audio && audio->UnlockAudio ) { |
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550 audio->UnlockAudio(audio); |
| 0 | 551 } |
| 552 } | |
| 553 | |
| 554 void SDL_CloseAudio (void) | |
| 555 { | |
| 556 SDL_QuitSubSystem(SDL_INIT_AUDIO); | |
| 557 } | |
| 558 | |
| 559 void SDL_AudioQuit(void) | |
| 560 { | |
| 561 SDL_AudioDevice *audio = current_audio; | |
| 562 | |
| 563 if ( audio ) { | |
| 564 audio->enabled = 0; | |
| 565 if ( audio->thread != NULL ) { | |
| 566 SDL_WaitThread(audio->thread, NULL); | |
| 567 } | |
| 568 if ( audio->mixer_lock != NULL ) { | |
| 569 SDL_DestroyMutex(audio->mixer_lock); | |
| 570 } | |
| 571 if ( audio->fake_stream != NULL ) { | |
| 572 SDL_FreeAudioMem(audio->fake_stream); | |
| 573 } | |
| 574 if ( audio->convert.needed ) { | |
| 575 SDL_FreeAudioMem(audio->convert.buf); | |
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576 |
| 0 | 577 } |
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578 #ifndef ENABLE_AHI |
| 0 | 579 if ( audio->opened ) { |
| 580 audio->CloseAudio(audio); | |
| 581 audio->opened = 0; | |
| 582 } | |
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583 #endif |
| 0 | 584 /* Free the driver data */ |
| 585 audio->free(audio); | |
| 586 current_audio = NULL; | |
| 587 } | |
| 588 } | |
| 589 | |
| 590 #define NUM_FORMATS 6 | |
| 591 static int format_idx; | |
| 592 static int format_idx_sub; | |
| 593 static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { | |
| 594 { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 595 { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 596 { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 597 { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 598 { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 599 { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 600 }; | |
| 601 | |
| 602 Uint16 SDL_FirstAudioFormat(Uint16 format) | |
| 603 { | |
| 604 for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { | |
| 605 if ( format_list[format_idx][0] == format ) { | |
| 606 break; | |
| 607 } | |
| 608 } | |
| 609 format_idx_sub = 0; | |
| 610 return(SDL_NextAudioFormat()); | |
| 611 } | |
| 612 | |
| 613 Uint16 SDL_NextAudioFormat(void) | |
| 614 { | |
| 615 if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { | |
| 616 return(0); | |
| 617 } | |
| 618 return(format_list[format_idx][format_idx_sub++]); | |
| 619 } | |
| 620 | |
| 621 void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) | |
| 622 { | |
| 623 switch (spec->format) { | |
| 624 case AUDIO_U8: | |
| 625 spec->silence = 0x80; | |
| 626 break; | |
| 627 default: | |
| 628 spec->silence = 0x00; | |
| 629 break; | |
| 630 } | |
| 631 spec->size = (spec->format&0xFF)/8; | |
| 632 spec->size *= spec->channels; | |
| 633 spec->size *= spec->samples; | |
| 634 } |