Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 630:550bccdf04bd
Added initial support for RISC OS (thanks Peter Naulls!)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 29 May 2003 04:44:13 +0000 |
| parents | dad72daf44b3 |
| children | 594422ab8f9f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2002
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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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Added Atari audio support (thanks Patrice!)
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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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Added initial support for Dreamcast (thanks HERO!)
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92 #ifdef ENABLE_DC |
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93 &DCAUD_bootstrap, |
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94 #endif |
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95 #ifdef DRENDERER_SUPPORT |
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96 &DRENDERER_bootstrap, |
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97 #endif |
| 0 | 98 NULL |
| 99 }; | |
| 100 SDL_AudioDevice *current_audio = NULL; | |
| 101 | |
| 102 /* Various local functions */ | |
| 103 int SDL_AudioInit(const char *driver_name); | |
| 104 void SDL_AudioQuit(void); | |
| 105 | |
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106 #ifdef ENABLE_AHI |
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107 static int audio_configured = 0; |
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108 #endif |
| 0 | 109 |
| 110 /* The general mixing thread function */ | |
| 111 int SDL_RunAudio(void *audiop) | |
| 112 { | |
| 113 SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; | |
| 114 Uint8 *stream; | |
| 115 int stream_len; | |
| 116 void *udata; | |
| 117 void (*fill)(void *userdata,Uint8 *stream, int len); | |
| 118 int silence; | |
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119 #ifdef ENABLE_AHI |
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120 int started = 0; |
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121 |
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122 /* AmigaOS NEEDS that the audio driver is opened in the thread that uses it! */ |
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123 |
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124 D(bug("Task audio started audio struct:<%lx>...\n",audiop)); |
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125 |
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126 D(bug("Before Openaudio...")); |
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127 if(audio->OpenAudio(audio, &audio->spec)==-1) |
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128 { |
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129 D(bug("Open audio failed...\n")); |
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130 return(-1); |
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131 } |
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132 D(bug("OpenAudio...OK\n")); |
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133 #endif |
| 0 | 134 |
| 135 /* Perform any thread setup */ | |
| 136 if ( audio->ThreadInit ) { | |
| 137 audio->ThreadInit(audio); | |
| 138 } | |
| 139 audio->threadid = SDL_ThreadID(); | |
| 140 | |
| 141 /* Set up the mixing function */ | |
| 142 fill = audio->spec.callback; | |
| 143 udata = audio->spec.userdata; | |
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144 |
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145 #ifdef ENABLE_AHI |
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146 audio_configured = 1; |
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147 |
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148 D(bug("Audio configured... Checking for conversion\n")); |
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149 SDL_mutexP(audio->mixer_lock); |
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150 D(bug("Semaphore obtained...\n")); |
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151 #endif |
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152 |
| 0 | 153 if ( audio->convert.needed ) { |
| 154 if ( audio->convert.src_format == AUDIO_U8 ) { | |
| 155 silence = 0x80; | |
| 156 } else { | |
| 157 silence = 0; | |
| 158 } | |
| 159 stream_len = audio->convert.len; | |
| 160 } else { | |
| 161 silence = audio->spec.silence; | |
| 162 stream_len = audio->spec.size; | |
| 163 } | |
| 164 stream = audio->fake_stream; | |
| 165 | |
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166 #ifdef ENABLE_AHI |
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167 SDL_mutexV(audio->mixer_lock); |
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168 D(bug("Entering audio loop...\n")); |
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169 #endif |
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170 |
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171 |
| 0 | 172 /* Loop, filling the audio buffers */ |
| 173 while ( audio->enabled ) { | |
| 174 | |
| 175 /* Wait for new current buffer to finish playing */ | |
| 176 if ( stream == audio->fake_stream ) { | |
| 177 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); | |
| 178 } else { | |
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179 #ifdef ENABLE_AHI |
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180 if ( started > 1 ) |
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181 #endif |
| 0 | 182 audio->WaitAudio(audio); |
| 183 } | |
| 184 | |
| 185 /* Fill the current buffer with sound */ | |
| 186 if ( audio->convert.needed ) { | |
| 187 if ( audio->convert.buf ) { | |
| 188 stream = audio->convert.buf; | |
| 189 } else { | |
| 190 continue; | |
| 191 } | |
| 192 } else { | |
| 193 stream = audio->GetAudioBuf(audio); | |
| 194 if ( stream == NULL ) { | |
| 195 stream = audio->fake_stream; | |
| 196 } | |
| 197 } | |
| 198 memset(stream, silence, stream_len); | |
| 199 | |
| 200 if ( ! audio->paused ) { | |
| 201 SDL_mutexP(audio->mixer_lock); | |
| 202 (*fill)(udata, stream, stream_len); | |
| 203 SDL_mutexV(audio->mixer_lock); | |
| 204 } | |
| 205 | |
| 206 /* Convert the audio if necessary */ | |
| 207 if ( audio->convert.needed ) { | |
| 208 SDL_ConvertAudio(&audio->convert); | |
| 209 stream = audio->GetAudioBuf(audio); | |
| 210 if ( stream == NULL ) { | |
| 211 stream = audio->fake_stream; | |
| 212 } | |
| 213 memcpy(stream, audio->convert.buf, | |
| 214 audio->convert.len_cvt); | |
| 215 } | |
| 216 | |
| 217 /* Ready current buffer for play and change current buffer */ | |
| 218 if ( stream != audio->fake_stream ) { | |
| 219 audio->PlayAudio(audio); | |
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220 #ifdef ENABLE_AHI |
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221 /* AmigaOS don't have to wait the first time audio is played! */ |
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222 started++; |
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223 #endif |
| 0 | 224 } |
| 225 } | |
| 226 /* Wait for the audio to drain.. */ | |
| 227 if ( audio->WaitDone ) { | |
| 228 audio->WaitDone(audio); | |
| 229 } | |
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230 |
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231 #ifdef ENABLE_AHI |
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232 D(bug("WaitAudio...Done\n")); |
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233 |
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234 audio->CloseAudio(audio); |
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235 |
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236 D(bug("CloseAudio..Done, subtask exiting...\n")); |
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237 audio_configured = 0; |
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238 #endif |
| 0 | 239 return(0); |
| 240 } | |
| 241 | |
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242 static void SDL_LockAudio_Default(SDL_AudioDevice *audio) |
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243 { |
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244 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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245 return; |
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246 } |
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247 SDL_mutexP(audio->mixer_lock); |
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248 } |
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249 |
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250 static void SDL_UnlockAudio_Default(SDL_AudioDevice *audio) |
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251 { |
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252 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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253 return; |
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254 } |
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255 SDL_mutexV(audio->mixer_lock); |
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256 } |
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257 |
| 0 | 258 int SDL_AudioInit(const char *driver_name) |
| 259 { | |
| 260 SDL_AudioDevice *audio; | |
| 261 int i = 0, idx; | |
| 262 | |
| 263 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 264 if ( current_audio != NULL ) { | |
| 265 SDL_AudioQuit(); | |
| 266 } | |
| 267 | |
| 268 /* Select the proper audio driver */ | |
| 269 audio = NULL; | |
| 270 idx = 0; | |
| 271 #ifdef unix | |
| 272 if ( (driver_name == NULL) && (getenv("ESPEAKER") != NULL) ) { | |
| 273 /* Ahem, we know that if ESPEAKER is set, user probably wants | |
| 274 to use ESD, but don't start it if it's not already running. | |
| 275 This probably isn't the place to do this, but... Shh! :) | |
| 276 */ | |
| 277 for ( i=0; bootstrap[i]; ++i ) { | |
| 278 if ( strcmp(bootstrap[i]->name, "esd") == 0 ) { | |
| 279 const char *esd_no_spawn; | |
| 280 | |
| 281 /* Don't start ESD if it's not running */ | |
| 282 esd_no_spawn = getenv("ESD_NO_SPAWN"); | |
| 283 if ( esd_no_spawn == NULL ) { | |
| 284 putenv("ESD_NO_SPAWN=1"); | |
| 285 } | |
| 286 if ( bootstrap[i]->available() ) { | |
| 287 audio = bootstrap[i]->create(0); | |
| 288 break; | |
| 289 } | |
| 290 #ifdef linux /* No unsetenv() on most platforms */ | |
| 291 if ( esd_no_spawn == NULL ) { | |
| 292 unsetenv("ESD_NO_SPAWN"); | |
| 293 } | |
| 294 #endif | |
| 295 } | |
| 296 } | |
| 297 } | |
| 298 #endif /* unix */ | |
| 299 if ( audio == NULL ) { | |
| 300 if ( driver_name != NULL ) { | |
| 301 #if 0 /* This will be replaced with a better driver selection API */ | |
| 302 if ( strrchr(driver_name, ':') != NULL ) { | |
| 303 idx = atoi(strrchr(driver_name, ':')+1); | |
| 304 } | |
| 305 #endif | |
| 306 for ( i=0; bootstrap[i]; ++i ) { | |
| 307 if (strncmp(bootstrap[i]->name, driver_name, | |
| 308 strlen(bootstrap[i]->name)) == 0) { | |
| 309 if ( bootstrap[i]->available() ) { | |
| 310 audio=bootstrap[i]->create(idx); | |
| 311 break; | |
| 312 } | |
| 313 } | |
| 314 } | |
| 315 } else { | |
| 316 for ( i=0; bootstrap[i]; ++i ) { | |
| 317 if ( bootstrap[i]->available() ) { | |
| 318 audio = bootstrap[i]->create(idx); | |
| 319 if ( audio != NULL ) { | |
| 320 break; | |
| 321 } | |
| 322 } | |
| 323 } | |
| 324 } | |
| 325 if ( audio == NULL ) { | |
| 326 SDL_SetError("No available audio device"); | |
| 327 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 328 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 329 */ | |
| 330 return(-1); | |
| 331 #endif | |
| 332 } | |
| 333 } | |
| 334 current_audio = audio; | |
| 335 if ( current_audio ) { | |
| 336 current_audio->name = bootstrap[i]->name; | |
|
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337 if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
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338 current_audio->LockAudio = SDL_LockAudio_Default; |
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339 current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
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340 } |
| 0 | 341 } |
| 342 return(0); | |
| 343 } | |
| 344 | |
| 345 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 346 { | |
| 347 if ( current_audio != NULL ) { | |
| 348 strncpy(namebuf, current_audio->name, maxlen-1); | |
| 349 namebuf[maxlen-1] = '\0'; | |
| 350 return(namebuf); | |
| 351 } | |
| 352 return(NULL); | |
| 353 } | |
| 354 | |
| 355 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 356 { | |
| 357 SDL_AudioDevice *audio; | |
| 358 | |
| 359 /* Start up the audio driver, if necessary */ | |
| 360 if ( ! current_audio ) { | |
| 361 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 362 (current_audio == NULL) ) { | |
| 363 return(-1); | |
| 364 } | |
| 365 } | |
| 366 audio = current_audio; | |
| 367 | |
|
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368 if (audio->opened) { |
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369 SDL_SetError("Audio device is already opened"); |
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370 return(-1); |
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371 } |
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372 |
| 0 | 373 /* Verify some parameters */ |
| 374 if ( desired->callback == NULL ) { | |
| 375 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 376 return(-1); | |
| 377 } | |
| 378 switch ( desired->channels ) { | |
| 379 case 1: /* Mono */ | |
| 380 case 2: /* Stereo */ | |
| 381 break; | |
| 382 default: | |
| 383 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 384 return(-1); | |
| 385 } | |
| 386 | |
|
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387 #if defined(macintosh) || defined(__riscos__) |
| 0 | 388 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ |
| 389 #else | |
|
398
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390 #if defined(__MINT__) && !defined(ENABLE_THREADS) |
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391 /* Uses interrupt driven audio, without thread */ |
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392 #else |
| 0 | 393 /* Create a semaphore for locking the sound buffers */ |
| 394 audio->mixer_lock = SDL_CreateMutex(); | |
| 395 if ( audio->mixer_lock == NULL ) { | |
| 396 SDL_SetError("Couldn't create mixer lock"); | |
| 397 SDL_CloseAudio(); | |
| 398 return(-1); | |
| 399 } | |
|
398
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400 #endif /* __MINT__ */ |
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401 #endif /* macintosh */ |
| 0 | 402 |
| 403 /* Calculate the silence and size of the audio specification */ | |
| 404 SDL_CalculateAudioSpec(desired); | |
| 405 | |
| 406 /* Open the audio subsystem */ | |
| 407 memcpy(&audio->spec, desired, sizeof(audio->spec)); | |
| 408 audio->convert.needed = 0; | |
| 409 audio->enabled = 1; | |
| 410 audio->paused = 1; | |
|
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411 |
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412 #ifndef ENABLE_AHI |
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413 |
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414 /* AmigaOS opens audio inside the main loop */ |
| 0 | 415 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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416 |
| 0 | 417 if ( ! audio->opened ) { |
| 418 SDL_CloseAudio(); | |
| 419 return(-1); | |
| 420 } | |
|
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421 #else |
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422 D(bug("Locking semaphore...")); |
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423 SDL_mutexP(audio->mixer_lock); |
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424 |
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425 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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426 D(bug("Created thread...\n")); |
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427 |
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428 if ( audio->thread == NULL ) { |
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429 SDL_mutexV(audio->mixer_lock); |
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430 SDL_CloseAudio(); |
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431 SDL_SetError("Couldn't create audio thread"); |
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432 return(-1); |
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433 } |
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434 |
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435 while(!audio_configured) |
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436 SDL_Delay(100); |
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437 #endif |
| 0 | 438 |
| 439 /* If the audio driver changes the buffer size, accept it */ | |
| 440 if ( audio->spec.samples != desired->samples ) { | |
| 441 desired->samples = audio->spec.samples; | |
| 442 SDL_CalculateAudioSpec(desired); | |
| 443 } | |
| 444 | |
| 445 /* Allocate a fake audio memory buffer */ | |
| 446 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 447 if ( audio->fake_stream == NULL ) { | |
| 448 SDL_CloseAudio(); | |
| 449 SDL_OutOfMemory(); | |
| 450 return(-1); | |
| 451 } | |
| 452 | |
| 453 /* See if we need to do any conversion */ | |
| 454 if ( memcmp(desired, &audio->spec, sizeof(audio->spec)) == 0 ) { | |
| 455 /* Just copy over the desired audio specification */ | |
| 456 if ( obtained != NULL ) { | |
| 457 memcpy(obtained, &audio->spec, sizeof(audio->spec)); | |
| 458 } | |
| 459 } else { | |
| 460 /* Copy over the audio specification if possible */ | |
| 461 if ( obtained != NULL ) { | |
| 462 memcpy(obtained, &audio->spec, sizeof(audio->spec)); | |
| 463 } else { | |
| 464 /* Build an audio conversion block */ | |
| 465 if ( SDL_BuildAudioCVT(&audio->convert, | |
| 466 desired->format, desired->channels, | |
| 467 desired->freq, | |
| 468 audio->spec.format, audio->spec.channels, | |
| 469 audio->spec.freq) < 0 ) { | |
| 470 SDL_CloseAudio(); | |
| 471 return(-1); | |
| 472 } | |
| 473 if ( audio->convert.needed ) { | |
| 474 audio->convert.len = desired->size; | |
| 475 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( | |
| 476 audio->convert.len*audio->convert.len_mult); | |
| 477 if ( audio->convert.buf == NULL ) { | |
| 478 SDL_CloseAudio(); | |
| 479 SDL_OutOfMemory(); | |
| 480 return(-1); | |
| 481 } | |
| 482 } | |
| 483 } | |
| 484 } | |
| 485 | |
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486 #ifndef ENABLE_AHI |
| 0 | 487 /* Start the audio thread if necessary */ |
| 488 switch (audio->opened) { | |
| 489 case 1: | |
| 490 /* Start the audio thread */ | |
| 491 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); | |
| 492 if ( audio->thread == NULL ) { | |
| 493 SDL_CloseAudio(); | |
| 494 SDL_SetError("Couldn't create audio thread"); | |
| 495 return(-1); | |
| 496 } | |
| 497 break; | |
| 498 | |
| 499 default: | |
| 500 /* The audio is now playing */ | |
| 501 break; | |
| 502 } | |
|
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503 #else |
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504 SDL_mutexV(audio->mixer_lock); |
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505 D(bug("SDL_OpenAudio USCITA...\n")); |
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506 |
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507 #endif |
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508 |
| 0 | 509 return(0); |
| 510 } | |
| 511 | |
| 512 SDL_audiostatus SDL_GetAudioStatus(void) | |
| 513 { | |
| 514 SDL_AudioDevice *audio = current_audio; | |
| 515 SDL_audiostatus status; | |
| 516 | |
| 517 status = SDL_AUDIO_STOPPED; | |
| 518 if ( audio && audio->enabled ) { | |
| 519 if ( audio->paused ) { | |
| 520 status = SDL_AUDIO_PAUSED; | |
| 521 } else { | |
| 522 status = SDL_AUDIO_PLAYING; | |
| 523 } | |
| 524 } | |
| 525 return(status); | |
| 526 } | |
| 527 | |
| 528 void SDL_PauseAudio (int pause_on) | |
| 529 { | |
| 530 SDL_AudioDevice *audio = current_audio; | |
| 531 | |
| 532 if ( audio ) { | |
| 533 audio->paused = pause_on; | |
| 534 } | |
| 535 } | |
| 536 | |
| 537 void SDL_LockAudio (void) | |
| 538 { | |
| 539 SDL_AudioDevice *audio = current_audio; | |
| 540 | |
| 541 /* Obtain a lock on the mixing buffers */ | |
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542 if ( audio && audio->LockAudio ) { |
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543 audio->LockAudio(audio); |
| 0 | 544 } |
| 545 } | |
| 546 | |
| 547 void SDL_UnlockAudio (void) | |
| 548 { | |
| 549 SDL_AudioDevice *audio = current_audio; | |
| 550 | |
| 551 /* Release lock on the mixing buffers */ | |
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552 if ( audio && audio->UnlockAudio ) { |
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553 audio->UnlockAudio(audio); |
| 0 | 554 } |
| 555 } | |
| 556 | |
| 557 void SDL_CloseAudio (void) | |
| 558 { | |
| 559 SDL_QuitSubSystem(SDL_INIT_AUDIO); | |
| 560 } | |
| 561 | |
| 562 void SDL_AudioQuit(void) | |
| 563 { | |
| 564 SDL_AudioDevice *audio = current_audio; | |
| 565 | |
| 566 if ( audio ) { | |
| 567 audio->enabled = 0; | |
| 568 if ( audio->thread != NULL ) { | |
| 569 SDL_WaitThread(audio->thread, NULL); | |
| 570 } | |
| 571 if ( audio->mixer_lock != NULL ) { | |
| 572 SDL_DestroyMutex(audio->mixer_lock); | |
| 573 } | |
| 574 if ( audio->fake_stream != NULL ) { | |
| 575 SDL_FreeAudioMem(audio->fake_stream); | |
| 576 } | |
| 577 if ( audio->convert.needed ) { | |
| 578 SDL_FreeAudioMem(audio->convert.buf); | |
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579 |
| 0 | 580 } |
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581 #ifndef ENABLE_AHI |
| 0 | 582 if ( audio->opened ) { |
| 583 audio->CloseAudio(audio); | |
| 584 audio->opened = 0; | |
| 585 } | |
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586 #endif |
| 0 | 587 /* Free the driver data */ |
| 588 audio->free(audio); | |
| 589 current_audio = NULL; | |
| 590 } | |
| 591 } | |
| 592 | |
| 593 #define NUM_FORMATS 6 | |
| 594 static int format_idx; | |
| 595 static int format_idx_sub; | |
| 596 static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { | |
| 597 { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 598 { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 599 { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 600 { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 601 { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 602 { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 603 }; | |
| 604 | |
| 605 Uint16 SDL_FirstAudioFormat(Uint16 format) | |
| 606 { | |
| 607 for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { | |
| 608 if ( format_list[format_idx][0] == format ) { | |
| 609 break; | |
| 610 } | |
| 611 } | |
| 612 format_idx_sub = 0; | |
| 613 return(SDL_NextAudioFormat()); | |
| 614 } | |
| 615 | |
| 616 Uint16 SDL_NextAudioFormat(void) | |
| 617 { | |
| 618 if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { | |
| 619 return(0); | |
| 620 } | |
| 621 return(format_list[format_idx][format_idx_sub++]); | |
| 622 } | |
| 623 | |
| 624 void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) | |
| 625 { | |
| 626 switch (spec->format) { | |
| 627 case AUDIO_U8: | |
| 628 spec->silence = 0x80; | |
| 629 break; | |
| 630 default: | |
| 631 spec->silence = 0x00; | |
| 632 break; | |
| 633 } | |
| 634 spec->size = (spec->format&0xFF)/8; | |
| 635 spec->size *= spec->channels; | |
| 636 spec->size *= spec->samples; | |
| 637 } |