Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 653:1bd056de5d1b
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 22 Jul 2003 05:29:48 +0000 |
| parents | 594422ab8f9f |
| children | e92bcf2573cb |
| 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_GSXB_bootstrap, |
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88 &MINTAUDIO_MCSN_bootstrap, |
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89 &MINTAUDIO_STFA_bootstrap, |
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90 &MINTAUDIO_XBIOS_bootstrap, |
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91 &MINTAUDIO_DMA8_bootstrap, |
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92 #endif |
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93 #ifdef DISKAUD_SUPPORT |
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94 &DISKAUD_bootstrap, |
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95 #endif |
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96 #ifdef ENABLE_DC |
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97 &DCAUD_bootstrap, |
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98 #endif |
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99 #ifdef DRENDERER_SUPPORT |
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100 &DRENDERER_bootstrap, |
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101 #endif |
| 0 | 102 NULL |
| 103 }; | |
| 104 SDL_AudioDevice *current_audio = NULL; | |
| 105 | |
| 106 /* Various local functions */ | |
| 107 int SDL_AudioInit(const char *driver_name); | |
| 108 void SDL_AudioQuit(void); | |
| 109 | |
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110 #ifdef ENABLE_AHI |
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111 static int audio_configured = 0; |
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112 #endif |
| 0 | 113 |
| 114 /* The general mixing thread function */ | |
| 115 int SDL_RunAudio(void *audiop) | |
| 116 { | |
| 117 SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; | |
| 118 Uint8 *stream; | |
| 119 int stream_len; | |
| 120 void *udata; | |
| 121 void (*fill)(void *userdata,Uint8 *stream, int len); | |
| 122 int silence; | |
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123 #ifdef ENABLE_AHI |
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124 int started = 0; |
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125 |
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126 /* AmigaOS NEEDS that the audio driver is opened in the thread that uses it! */ |
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127 |
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128 D(bug("Task audio started audio struct:<%lx>...\n",audiop)); |
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129 |
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130 D(bug("Before Openaudio...")); |
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131 if(audio->OpenAudio(audio, &audio->spec)==-1) |
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132 { |
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133 D(bug("Open audio failed...\n")); |
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134 return(-1); |
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135 } |
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136 D(bug("OpenAudio...OK\n")); |
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137 #endif |
| 0 | 138 |
| 139 /* Perform any thread setup */ | |
| 140 if ( audio->ThreadInit ) { | |
| 141 audio->ThreadInit(audio); | |
| 142 } | |
| 143 audio->threadid = SDL_ThreadID(); | |
| 144 | |
| 145 /* Set up the mixing function */ | |
| 146 fill = audio->spec.callback; | |
| 147 udata = audio->spec.userdata; | |
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148 |
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149 #ifdef ENABLE_AHI |
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150 audio_configured = 1; |
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151 |
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152 D(bug("Audio configured... Checking for conversion\n")); |
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153 SDL_mutexP(audio->mixer_lock); |
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154 D(bug("Semaphore obtained...\n")); |
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155 #endif |
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156 |
| 0 | 157 if ( audio->convert.needed ) { |
| 158 if ( audio->convert.src_format == AUDIO_U8 ) { | |
| 159 silence = 0x80; | |
| 160 } else { | |
| 161 silence = 0; | |
| 162 } | |
| 163 stream_len = audio->convert.len; | |
| 164 } else { | |
| 165 silence = audio->spec.silence; | |
| 166 stream_len = audio->spec.size; | |
| 167 } | |
| 168 stream = audio->fake_stream; | |
| 169 | |
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170 #ifdef ENABLE_AHI |
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171 SDL_mutexV(audio->mixer_lock); |
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172 D(bug("Entering audio loop...\n")); |
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173 #endif |
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174 |
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175 |
| 0 | 176 /* Loop, filling the audio buffers */ |
| 177 while ( audio->enabled ) { | |
| 178 | |
| 179 /* Wait for new current buffer to finish playing */ | |
| 180 if ( stream == audio->fake_stream ) { | |
| 181 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); | |
| 182 } else { | |
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183 #ifdef ENABLE_AHI |
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184 if ( started > 1 ) |
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185 #endif |
| 0 | 186 audio->WaitAudio(audio); |
| 187 } | |
| 188 | |
| 189 /* Fill the current buffer with sound */ | |
| 190 if ( audio->convert.needed ) { | |
| 191 if ( audio->convert.buf ) { | |
| 192 stream = audio->convert.buf; | |
| 193 } else { | |
| 194 continue; | |
| 195 } | |
| 196 } else { | |
| 197 stream = audio->GetAudioBuf(audio); | |
| 198 if ( stream == NULL ) { | |
| 199 stream = audio->fake_stream; | |
| 200 } | |
| 201 } | |
| 202 memset(stream, silence, stream_len); | |
| 203 | |
| 204 if ( ! audio->paused ) { | |
| 205 SDL_mutexP(audio->mixer_lock); | |
| 206 (*fill)(udata, stream, stream_len); | |
| 207 SDL_mutexV(audio->mixer_lock); | |
| 208 } | |
| 209 | |
| 210 /* Convert the audio if necessary */ | |
| 211 if ( audio->convert.needed ) { | |
| 212 SDL_ConvertAudio(&audio->convert); | |
| 213 stream = audio->GetAudioBuf(audio); | |
| 214 if ( stream == NULL ) { | |
| 215 stream = audio->fake_stream; | |
| 216 } | |
| 217 memcpy(stream, audio->convert.buf, | |
| 218 audio->convert.len_cvt); | |
| 219 } | |
| 220 | |
| 221 /* Ready current buffer for play and change current buffer */ | |
| 222 if ( stream != audio->fake_stream ) { | |
| 223 audio->PlayAudio(audio); | |
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224 #ifdef ENABLE_AHI |
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225 /* AmigaOS don't have to wait the first time audio is played! */ |
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226 started++; |
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227 #endif |
| 0 | 228 } |
| 229 } | |
| 230 /* Wait for the audio to drain.. */ | |
| 231 if ( audio->WaitDone ) { | |
| 232 audio->WaitDone(audio); | |
| 233 } | |
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234 |
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235 #ifdef ENABLE_AHI |
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236 D(bug("WaitAudio...Done\n")); |
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237 |
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238 audio->CloseAudio(audio); |
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239 |
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240 D(bug("CloseAudio..Done, subtask exiting...\n")); |
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241 audio_configured = 0; |
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242 #endif |
| 0 | 243 return(0); |
| 244 } | |
| 245 | |
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246 static void SDL_LockAudio_Default(SDL_AudioDevice *audio) |
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247 { |
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248 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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249 return; |
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250 } |
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251 SDL_mutexP(audio->mixer_lock); |
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252 } |
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253 |
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254 static void SDL_UnlockAudio_Default(SDL_AudioDevice *audio) |
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255 { |
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256 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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257 return; |
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258 } |
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259 SDL_mutexV(audio->mixer_lock); |
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260 } |
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261 |
| 0 | 262 int SDL_AudioInit(const char *driver_name) |
| 263 { | |
| 264 SDL_AudioDevice *audio; | |
| 265 int i = 0, idx; | |
| 266 | |
| 267 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 268 if ( current_audio != NULL ) { | |
| 269 SDL_AudioQuit(); | |
| 270 } | |
| 271 | |
| 272 /* Select the proper audio driver */ | |
| 273 audio = NULL; | |
| 274 idx = 0; | |
| 275 #ifdef unix | |
| 276 if ( (driver_name == NULL) && (getenv("ESPEAKER") != NULL) ) { | |
| 277 /* Ahem, we know that if ESPEAKER is set, user probably wants | |
| 278 to use ESD, but don't start it if it's not already running. | |
| 279 This probably isn't the place to do this, but... Shh! :) | |
| 280 */ | |
| 281 for ( i=0; bootstrap[i]; ++i ) { | |
| 282 if ( strcmp(bootstrap[i]->name, "esd") == 0 ) { | |
| 283 const char *esd_no_spawn; | |
| 284 | |
| 285 /* Don't start ESD if it's not running */ | |
| 286 esd_no_spawn = getenv("ESD_NO_SPAWN"); | |
| 287 if ( esd_no_spawn == NULL ) { | |
| 288 putenv("ESD_NO_SPAWN=1"); | |
| 289 } | |
| 290 if ( bootstrap[i]->available() ) { | |
| 291 audio = bootstrap[i]->create(0); | |
| 292 break; | |
| 293 } | |
| 294 #ifdef linux /* No unsetenv() on most platforms */ | |
| 295 if ( esd_no_spawn == NULL ) { | |
| 296 unsetenv("ESD_NO_SPAWN"); | |
| 297 } | |
| 298 #endif | |
| 299 } | |
| 300 } | |
| 301 } | |
| 302 #endif /* unix */ | |
| 303 if ( audio == NULL ) { | |
| 304 if ( driver_name != NULL ) { | |
| 305 #if 0 /* This will be replaced with a better driver selection API */ | |
| 306 if ( strrchr(driver_name, ':') != NULL ) { | |
| 307 idx = atoi(strrchr(driver_name, ':')+1); | |
| 308 } | |
| 309 #endif | |
| 310 for ( i=0; bootstrap[i]; ++i ) { | |
| 311 if (strncmp(bootstrap[i]->name, driver_name, | |
| 312 strlen(bootstrap[i]->name)) == 0) { | |
| 313 if ( bootstrap[i]->available() ) { | |
| 314 audio=bootstrap[i]->create(idx); | |
| 315 break; | |
| 316 } | |
| 317 } | |
| 318 } | |
| 319 } else { | |
| 320 for ( i=0; bootstrap[i]; ++i ) { | |
| 321 if ( bootstrap[i]->available() ) { | |
| 322 audio = bootstrap[i]->create(idx); | |
| 323 if ( audio != NULL ) { | |
| 324 break; | |
| 325 } | |
| 326 } | |
| 327 } | |
| 328 } | |
| 329 if ( audio == NULL ) { | |
| 330 SDL_SetError("No available audio device"); | |
| 331 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 332 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 333 */ | |
| 334 return(-1); | |
| 335 #endif | |
| 336 } | |
| 337 } | |
| 338 current_audio = audio; | |
| 339 if ( current_audio ) { | |
| 340 current_audio->name = bootstrap[i]->name; | |
|
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341 if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
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342 current_audio->LockAudio = SDL_LockAudio_Default; |
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343 current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
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344 } |
| 0 | 345 } |
| 346 return(0); | |
| 347 } | |
| 348 | |
| 349 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 350 { | |
| 351 if ( current_audio != NULL ) { | |
| 352 strncpy(namebuf, current_audio->name, maxlen-1); | |
| 353 namebuf[maxlen-1] = '\0'; | |
| 354 return(namebuf); | |
| 355 } | |
| 356 return(NULL); | |
| 357 } | |
| 358 | |
| 359 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 360 { | |
| 361 SDL_AudioDevice *audio; | |
| 362 | |
| 363 /* Start up the audio driver, if necessary */ | |
| 364 if ( ! current_audio ) { | |
| 365 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 366 (current_audio == NULL) ) { | |
| 367 return(-1); | |
| 368 } | |
| 369 } | |
| 370 audio = current_audio; | |
| 371 | |
|
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372 if (audio->opened) { |
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373 SDL_SetError("Audio device is already opened"); |
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374 return(-1); |
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375 } |
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376 |
| 0 | 377 /* Verify some parameters */ |
| 378 if ( desired->callback == NULL ) { | |
| 379 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 380 return(-1); | |
| 381 } | |
| 382 switch ( desired->channels ) { | |
| 383 case 1: /* Mono */ | |
| 384 case 2: /* Stereo */ | |
| 385 break; | |
| 386 default: | |
| 387 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 388 return(-1); | |
| 389 } | |
| 390 | |
|
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391 #if defined(macintosh) || defined(__riscos__) |
| 0 | 392 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ |
| 393 #else | |
|
398
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394 #if defined(__MINT__) && !defined(ENABLE_THREADS) |
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395 /* Uses interrupt driven audio, without thread */ |
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396 #else |
| 0 | 397 /* Create a semaphore for locking the sound buffers */ |
| 398 audio->mixer_lock = SDL_CreateMutex(); | |
| 399 if ( audio->mixer_lock == NULL ) { | |
| 400 SDL_SetError("Couldn't create mixer lock"); | |
| 401 SDL_CloseAudio(); | |
| 402 return(-1); | |
| 403 } | |
|
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404 #endif /* __MINT__ */ |
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405 #endif /* macintosh */ |
| 0 | 406 |
| 407 /* Calculate the silence and size of the audio specification */ | |
| 408 SDL_CalculateAudioSpec(desired); | |
| 409 | |
| 410 /* Open the audio subsystem */ | |
| 411 memcpy(&audio->spec, desired, sizeof(audio->spec)); | |
| 412 audio->convert.needed = 0; | |
| 413 audio->enabled = 1; | |
| 414 audio->paused = 1; | |
|
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415 |
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416 #ifndef ENABLE_AHI |
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417 |
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418 /* AmigaOS opens audio inside the main loop */ |
| 0 | 419 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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420 |
| 0 | 421 if ( ! audio->opened ) { |
| 422 SDL_CloseAudio(); | |
| 423 return(-1); | |
| 424 } | |
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425 #else |
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426 D(bug("Locking semaphore...")); |
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427 SDL_mutexP(audio->mixer_lock); |
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428 |
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429 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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430 D(bug("Created thread...\n")); |
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431 |
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432 if ( audio->thread == NULL ) { |
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433 SDL_mutexV(audio->mixer_lock); |
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434 SDL_CloseAudio(); |
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435 SDL_SetError("Couldn't create audio thread"); |
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436 return(-1); |
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437 } |
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438 |
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439 while(!audio_configured) |
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440 SDL_Delay(100); |
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441 #endif |
| 0 | 442 |
| 443 /* If the audio driver changes the buffer size, accept it */ | |
| 444 if ( audio->spec.samples != desired->samples ) { | |
| 445 desired->samples = audio->spec.samples; | |
| 446 SDL_CalculateAudioSpec(desired); | |
| 447 } | |
| 448 | |
| 449 /* Allocate a fake audio memory buffer */ | |
| 450 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 451 if ( audio->fake_stream == NULL ) { | |
| 452 SDL_CloseAudio(); | |
| 453 SDL_OutOfMemory(); | |
| 454 return(-1); | |
| 455 } | |
| 456 | |
| 457 /* See if we need to do any conversion */ | |
| 458 if ( memcmp(desired, &audio->spec, sizeof(audio->spec)) == 0 ) { | |
| 459 /* Just copy over the desired audio specification */ | |
| 460 if ( obtained != NULL ) { | |
| 461 memcpy(obtained, &audio->spec, sizeof(audio->spec)); | |
| 462 } | |
| 463 } else { | |
| 464 /* Copy over the audio specification if possible */ | |
| 465 if ( obtained != NULL ) { | |
| 466 memcpy(obtained, &audio->spec, sizeof(audio->spec)); | |
| 467 } else { | |
| 468 /* Build an audio conversion block */ | |
| 469 if ( SDL_BuildAudioCVT(&audio->convert, | |
| 470 desired->format, desired->channels, | |
| 471 desired->freq, | |
| 472 audio->spec.format, audio->spec.channels, | |
| 473 audio->spec.freq) < 0 ) { | |
| 474 SDL_CloseAudio(); | |
| 475 return(-1); | |
| 476 } | |
| 477 if ( audio->convert.needed ) { | |
| 478 audio->convert.len = desired->size; | |
| 479 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( | |
| 480 audio->convert.len*audio->convert.len_mult); | |
| 481 if ( audio->convert.buf == NULL ) { | |
| 482 SDL_CloseAudio(); | |
| 483 SDL_OutOfMemory(); | |
| 484 return(-1); | |
| 485 } | |
| 486 } | |
| 487 } | |
| 488 } | |
| 489 | |
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490 #ifndef ENABLE_AHI |
| 0 | 491 /* Start the audio thread if necessary */ |
| 492 switch (audio->opened) { | |
| 493 case 1: | |
| 494 /* Start the audio thread */ | |
| 495 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); | |
| 496 if ( audio->thread == NULL ) { | |
| 497 SDL_CloseAudio(); | |
| 498 SDL_SetError("Couldn't create audio thread"); | |
| 499 return(-1); | |
| 500 } | |
| 501 break; | |
| 502 | |
| 503 default: | |
| 504 /* The audio is now playing */ | |
| 505 break; | |
| 506 } | |
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507 #else |
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508 SDL_mutexV(audio->mixer_lock); |
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509 D(bug("SDL_OpenAudio USCITA...\n")); |
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510 |
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511 #endif |
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512 |
| 0 | 513 return(0); |
| 514 } | |
| 515 | |
| 516 SDL_audiostatus SDL_GetAudioStatus(void) | |
| 517 { | |
| 518 SDL_AudioDevice *audio = current_audio; | |
| 519 SDL_audiostatus status; | |
| 520 | |
| 521 status = SDL_AUDIO_STOPPED; | |
| 522 if ( audio && audio->enabled ) { | |
| 523 if ( audio->paused ) { | |
| 524 status = SDL_AUDIO_PAUSED; | |
| 525 } else { | |
| 526 status = SDL_AUDIO_PLAYING; | |
| 527 } | |
| 528 } | |
| 529 return(status); | |
| 530 } | |
| 531 | |
| 532 void SDL_PauseAudio (int pause_on) | |
| 533 { | |
| 534 SDL_AudioDevice *audio = current_audio; | |
| 535 | |
| 536 if ( audio ) { | |
| 537 audio->paused = pause_on; | |
| 538 } | |
| 539 } | |
| 540 | |
| 541 void SDL_LockAudio (void) | |
| 542 { | |
| 543 SDL_AudioDevice *audio = current_audio; | |
| 544 | |
| 545 /* Obtain a lock on the mixing buffers */ | |
|
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546 if ( audio && audio->LockAudio ) { |
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547 audio->LockAudio(audio); |
| 0 | 548 } |
| 549 } | |
| 550 | |
| 551 void SDL_UnlockAudio (void) | |
| 552 { | |
| 553 SDL_AudioDevice *audio = current_audio; | |
| 554 | |
| 555 /* Release lock on the mixing buffers */ | |
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556 if ( audio && audio->UnlockAudio ) { |
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557 audio->UnlockAudio(audio); |
| 0 | 558 } |
| 559 } | |
| 560 | |
| 561 void SDL_CloseAudio (void) | |
| 562 { | |
| 563 SDL_QuitSubSystem(SDL_INIT_AUDIO); | |
| 564 } | |
| 565 | |
| 566 void SDL_AudioQuit(void) | |
| 567 { | |
| 568 SDL_AudioDevice *audio = current_audio; | |
| 569 | |
| 570 if ( audio ) { | |
| 571 audio->enabled = 0; | |
| 572 if ( audio->thread != NULL ) { | |
| 573 SDL_WaitThread(audio->thread, NULL); | |
| 574 } | |
| 575 if ( audio->mixer_lock != NULL ) { | |
| 576 SDL_DestroyMutex(audio->mixer_lock); | |
| 577 } | |
| 578 if ( audio->fake_stream != NULL ) { | |
| 579 SDL_FreeAudioMem(audio->fake_stream); | |
| 580 } | |
| 581 if ( audio->convert.needed ) { | |
| 582 SDL_FreeAudioMem(audio->convert.buf); | |
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583 |
| 0 | 584 } |
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585 #ifndef ENABLE_AHI |
| 0 | 586 if ( audio->opened ) { |
| 587 audio->CloseAudio(audio); | |
| 588 audio->opened = 0; | |
| 589 } | |
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21
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
590 #endif |
| 0 | 591 /* Free the driver data */ |
| 592 audio->free(audio); | |
| 593 current_audio = NULL; | |
| 594 } | |
| 595 } | |
| 596 | |
| 597 #define NUM_FORMATS 6 | |
| 598 static int format_idx; | |
| 599 static int format_idx_sub; | |
| 600 static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { | |
| 601 { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 602 { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 603 { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 604 { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 605 { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 606 { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 607 }; | |
| 608 | |
| 609 Uint16 SDL_FirstAudioFormat(Uint16 format) | |
| 610 { | |
| 611 for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { | |
| 612 if ( format_list[format_idx][0] == format ) { | |
| 613 break; | |
| 614 } | |
| 615 } | |
| 616 format_idx_sub = 0; | |
| 617 return(SDL_NextAudioFormat()); | |
| 618 } | |
| 619 | |
| 620 Uint16 SDL_NextAudioFormat(void) | |
| 621 { | |
| 622 if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { | |
| 623 return(0); | |
| 624 } | |
| 625 return(format_list[format_idx][format_idx_sub++]); | |
| 626 } | |
| 627 | |
| 628 void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) | |
| 629 { | |
| 630 switch (spec->format) { | |
| 631 case AUDIO_U8: | |
| 632 spec->silence = 0x80; | |
| 633 break; | |
| 634 default: | |
| 635 spec->silence = 0x00; | |
| 636 break; | |
| 637 } | |
| 638 spec->size = (spec->format&0xFF)/8; | |
| 639 spec->size *= spec->channels; | |
| 640 spec->size *= spec->samples; | |
| 641 } |