Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 844:cd0c77df70a4
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 18 Feb 2004 03:57:13 +0000 |
| parents | 0defd90ef27c |
| children | f8d5ddc7aef1 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2004 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 QNXNTOAUDIO_SUPPORT |
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54 &QNXNTOAUDIO_bootstrap, |
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55 #endif |
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56 #ifdef SUNAUDIO_SUPPORT |
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57 &SUNAUDIO_bootstrap, |
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58 #endif |
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59 #ifdef DMEDIA_SUPPORT |
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60 &DMEDIA_bootstrap, |
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61 #endif |
| 0 | 62 #ifdef ARTSC_SUPPORT |
| 63 &ARTSC_bootstrap, | |
| 64 #endif | |
| 65 #ifdef ESD_SUPPORT | |
| 66 &ESD_bootstrap, | |
| 67 #endif | |
| 68 #ifdef NAS_SUPPORT | |
| 69 &NAS_bootstrap, | |
| 70 #endif | |
| 71 #ifdef ENABLE_DIRECTX | |
| 72 &DSOUND_bootstrap, | |
| 73 #endif | |
| 74 #ifdef ENABLE_WINDIB | |
| 75 &WAVEOUT_bootstrap, | |
| 76 #endif | |
| 77 #ifdef __BEOS__ | |
| 78 &BAUDIO_bootstrap, | |
| 79 #endif | |
| 80 #if defined(macintosh) || TARGET_API_MAC_CARBON | |
| 81 &SNDMGR_bootstrap, | |
| 82 #endif | |
| 83 #ifdef _AIX | |
| 84 &Paud_bootstrap, | |
| 85 #endif | |
|
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86 #ifdef ENABLE_AHI |
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87 &AHI_bootstrap, |
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88 #endif |
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89 #ifdef MMEAUDIO_SUPPORT |
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90 &MMEAUDIO_bootstrap, |
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91 #endif |
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92 #ifdef MINTAUDIO_SUPPORT |
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93 &MINTAUDIO_GSXB_bootstrap, |
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94 &MINTAUDIO_MCSN_bootstrap, |
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95 &MINTAUDIO_STFA_bootstrap, |
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96 &MINTAUDIO_XBIOS_bootstrap, |
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97 &MINTAUDIO_DMA8_bootstrap, |
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98 #endif |
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99 #ifdef DISKAUD_SUPPORT |
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100 &DISKAUD_bootstrap, |
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101 #endif |
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102 #ifdef ENABLE_DC |
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103 &DCAUD_bootstrap, |
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104 #endif |
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105 #ifdef DRENDERER_SUPPORT |
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106 &DRENDERER_bootstrap, |
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107 #endif |
| 0 | 108 NULL |
| 109 }; | |
| 110 SDL_AudioDevice *current_audio = NULL; | |
| 111 | |
| 112 /* Various local functions */ | |
| 113 int SDL_AudioInit(const char *driver_name); | |
| 114 void SDL_AudioQuit(void); | |
| 115 | |
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116 #ifdef ENABLE_AHI |
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117 static int audio_configured = 0; |
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118 #endif |
| 0 | 119 |
| 120 /* The general mixing thread function */ | |
| 121 int SDL_RunAudio(void *audiop) | |
| 122 { | |
| 123 SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; | |
| 124 Uint8 *stream; | |
| 125 int stream_len; | |
| 126 void *udata; | |
| 127 void (*fill)(void *userdata,Uint8 *stream, int len); | |
| 128 int silence; | |
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129 #ifdef ENABLE_AHI |
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130 int started = 0; |
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131 |
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132 /* AmigaOS NEEDS that the audio driver is opened in the thread that uses it! */ |
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133 |
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134 D(bug("Task audio started audio struct:<%lx>...\n",audiop)); |
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135 |
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136 D(bug("Before Openaudio...")); |
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137 if(audio->OpenAudio(audio, &audio->spec)==-1) |
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138 { |
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139 D(bug("Open audio failed...\n")); |
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140 return(-1); |
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141 } |
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142 D(bug("OpenAudio...OK\n")); |
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143 #endif |
| 0 | 144 |
| 145 /* Perform any thread setup */ | |
| 146 if ( audio->ThreadInit ) { | |
| 147 audio->ThreadInit(audio); | |
| 148 } | |
| 149 audio->threadid = SDL_ThreadID(); | |
| 150 | |
| 151 /* Set up the mixing function */ | |
| 152 fill = audio->spec.callback; | |
| 153 udata = audio->spec.userdata; | |
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154 |
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155 #ifdef ENABLE_AHI |
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156 audio_configured = 1; |
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157 |
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158 D(bug("Audio configured... Checking for conversion\n")); |
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159 SDL_mutexP(audio->mixer_lock); |
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160 D(bug("Semaphore obtained...\n")); |
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161 #endif |
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162 |
| 0 | 163 if ( audio->convert.needed ) { |
| 164 if ( audio->convert.src_format == AUDIO_U8 ) { | |
| 165 silence = 0x80; | |
| 166 } else { | |
| 167 silence = 0; | |
| 168 } | |
| 169 stream_len = audio->convert.len; | |
| 170 } else { | |
| 171 silence = audio->spec.silence; | |
| 172 stream_len = audio->spec.size; | |
| 173 } | |
| 174 stream = audio->fake_stream; | |
| 175 | |
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176 #ifdef ENABLE_AHI |
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177 SDL_mutexV(audio->mixer_lock); |
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178 D(bug("Entering audio loop...\n")); |
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179 #endif |
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180 |
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181 |
| 0 | 182 /* Loop, filling the audio buffers */ |
| 183 while ( audio->enabled ) { | |
| 184 | |
| 185 /* Wait for new current buffer to finish playing */ | |
| 186 if ( stream == audio->fake_stream ) { | |
| 187 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); | |
| 188 } else { | |
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189 #ifdef ENABLE_AHI |
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190 if ( started > 1 ) |
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191 #endif |
| 0 | 192 audio->WaitAudio(audio); |
| 193 } | |
| 194 | |
| 195 /* Fill the current buffer with sound */ | |
| 196 if ( audio->convert.needed ) { | |
| 197 if ( audio->convert.buf ) { | |
| 198 stream = audio->convert.buf; | |
| 199 } else { | |
| 200 continue; | |
| 201 } | |
| 202 } else { | |
| 203 stream = audio->GetAudioBuf(audio); | |
| 204 if ( stream == NULL ) { | |
| 205 stream = audio->fake_stream; | |
| 206 } | |
| 207 } | |
| 208 memset(stream, silence, stream_len); | |
| 209 | |
| 210 if ( ! audio->paused ) { | |
| 211 SDL_mutexP(audio->mixer_lock); | |
| 212 (*fill)(udata, stream, stream_len); | |
| 213 SDL_mutexV(audio->mixer_lock); | |
| 214 } | |
| 215 | |
| 216 /* Convert the audio if necessary */ | |
| 217 if ( audio->convert.needed ) { | |
| 218 SDL_ConvertAudio(&audio->convert); | |
| 219 stream = audio->GetAudioBuf(audio); | |
| 220 if ( stream == NULL ) { | |
| 221 stream = audio->fake_stream; | |
| 222 } | |
| 223 memcpy(stream, audio->convert.buf, | |
| 224 audio->convert.len_cvt); | |
| 225 } | |
| 226 | |
| 227 /* Ready current buffer for play and change current buffer */ | |
| 228 if ( stream != audio->fake_stream ) { | |
| 229 audio->PlayAudio(audio); | |
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230 #ifdef ENABLE_AHI |
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231 /* AmigaOS don't have to wait the first time audio is played! */ |
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232 started++; |
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233 #endif |
| 0 | 234 } |
| 235 } | |
| 236 /* Wait for the audio to drain.. */ | |
| 237 if ( audio->WaitDone ) { | |
| 238 audio->WaitDone(audio); | |
| 239 } | |
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240 |
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241 #ifdef ENABLE_AHI |
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242 D(bug("WaitAudio...Done\n")); |
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243 |
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244 audio->CloseAudio(audio); |
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245 |
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246 D(bug("CloseAudio..Done, subtask exiting...\n")); |
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247 audio_configured = 0; |
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248 #endif |
| 0 | 249 return(0); |
| 250 } | |
| 251 | |
|
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252 static void SDL_LockAudio_Default(SDL_AudioDevice *audio) |
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253 { |
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254 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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255 return; |
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256 } |
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257 SDL_mutexP(audio->mixer_lock); |
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258 } |
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259 |
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260 static void SDL_UnlockAudio_Default(SDL_AudioDevice *audio) |
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261 { |
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262 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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263 return; |
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264 } |
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265 SDL_mutexV(audio->mixer_lock); |
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266 } |
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267 |
| 0 | 268 int SDL_AudioInit(const char *driver_name) |
| 269 { | |
| 270 SDL_AudioDevice *audio; | |
| 271 int i = 0, idx; | |
| 272 | |
| 273 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 274 if ( current_audio != NULL ) { | |
| 275 SDL_AudioQuit(); | |
| 276 } | |
| 277 | |
| 278 /* Select the proper audio driver */ | |
| 279 audio = NULL; | |
| 280 idx = 0; | |
| 281 #ifdef unix | |
| 282 if ( (driver_name == NULL) && (getenv("ESPEAKER") != NULL) ) { | |
| 283 /* Ahem, we know that if ESPEAKER is set, user probably wants | |
| 284 to use ESD, but don't start it if it's not already running. | |
| 285 This probably isn't the place to do this, but... Shh! :) | |
| 286 */ | |
| 287 for ( i=0; bootstrap[i]; ++i ) { | |
| 288 if ( strcmp(bootstrap[i]->name, "esd") == 0 ) { | |
| 289 const char *esd_no_spawn; | |
| 290 | |
| 291 /* Don't start ESD if it's not running */ | |
| 292 esd_no_spawn = getenv("ESD_NO_SPAWN"); | |
| 293 if ( esd_no_spawn == NULL ) { | |
| 294 putenv("ESD_NO_SPAWN=1"); | |
| 295 } | |
| 296 if ( bootstrap[i]->available() ) { | |
| 297 audio = bootstrap[i]->create(0); | |
| 298 break; | |
| 299 } | |
| 300 #ifdef linux /* No unsetenv() on most platforms */ | |
| 301 if ( esd_no_spawn == NULL ) { | |
| 302 unsetenv("ESD_NO_SPAWN"); | |
| 303 } | |
| 304 #endif | |
| 305 } | |
| 306 } | |
| 307 } | |
| 308 #endif /* unix */ | |
| 309 if ( audio == NULL ) { | |
| 310 if ( driver_name != NULL ) { | |
| 311 #if 0 /* This will be replaced with a better driver selection API */ | |
| 312 if ( strrchr(driver_name, ':') != NULL ) { | |
| 313 idx = atoi(strrchr(driver_name, ':')+1); | |
| 314 } | |
| 315 #endif | |
| 316 for ( i=0; bootstrap[i]; ++i ) { | |
| 317 if (strncmp(bootstrap[i]->name, driver_name, | |
| 318 strlen(bootstrap[i]->name)) == 0) { | |
| 319 if ( bootstrap[i]->available() ) { | |
| 320 audio=bootstrap[i]->create(idx); | |
| 321 break; | |
| 322 } | |
| 323 } | |
| 324 } | |
| 325 } else { | |
| 326 for ( i=0; bootstrap[i]; ++i ) { | |
| 327 if ( bootstrap[i]->available() ) { | |
| 328 audio = bootstrap[i]->create(idx); | |
| 329 if ( audio != NULL ) { | |
| 330 break; | |
| 331 } | |
| 332 } | |
| 333 } | |
| 334 } | |
| 335 if ( audio == NULL ) { | |
| 336 SDL_SetError("No available audio device"); | |
| 337 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 338 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 339 */ | |
| 340 return(-1); | |
| 341 #endif | |
| 342 } | |
| 343 } | |
| 344 current_audio = audio; | |
| 345 if ( current_audio ) { | |
| 346 current_audio->name = bootstrap[i]->name; | |
|
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347 if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
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348 current_audio->LockAudio = SDL_LockAudio_Default; |
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349 current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
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350 } |
| 0 | 351 } |
| 352 return(0); | |
| 353 } | |
| 354 | |
| 355 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 356 { | |
| 357 if ( current_audio != NULL ) { | |
| 358 strncpy(namebuf, current_audio->name, maxlen-1); | |
| 359 namebuf[maxlen-1] = '\0'; | |
| 360 return(namebuf); | |
| 361 } | |
| 362 return(NULL); | |
| 363 } | |
| 364 | |
| 365 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 366 { | |
| 367 SDL_AudioDevice *audio; | |
| 368 | |
| 369 /* Start up the audio driver, if necessary */ | |
| 370 if ( ! current_audio ) { | |
| 371 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 372 (current_audio == NULL) ) { | |
| 373 return(-1); | |
| 374 } | |
| 375 } | |
| 376 audio = current_audio; | |
| 377 | |
|
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378 if (audio->opened) { |
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379 SDL_SetError("Audio device is already opened"); |
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380 return(-1); |
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381 } |
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382 |
| 0 | 383 /* Verify some parameters */ |
| 384 if ( desired->callback == NULL ) { | |
| 385 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 386 return(-1); | |
| 387 } | |
| 388 switch ( desired->channels ) { | |
| 389 case 1: /* Mono */ | |
| 390 case 2: /* Stereo */ | |
| 391 break; | |
| 392 default: | |
| 393 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 394 return(-1); | |
| 395 } | |
| 396 | |
|
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397 #if defined(macintosh) || defined(__riscos__) |
| 0 | 398 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ |
| 399 #else | |
|
398
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400 #if defined(__MINT__) && !defined(ENABLE_THREADS) |
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401 /* Uses interrupt driven audio, without thread */ |
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402 #else |
| 0 | 403 /* Create a semaphore for locking the sound buffers */ |
| 404 audio->mixer_lock = SDL_CreateMutex(); | |
| 405 if ( audio->mixer_lock == NULL ) { | |
| 406 SDL_SetError("Couldn't create mixer lock"); | |
| 407 SDL_CloseAudio(); | |
| 408 return(-1); | |
| 409 } | |
|
398
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410 #endif /* __MINT__ */ |
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411 #endif /* macintosh */ |
| 0 | 412 |
| 413 /* Calculate the silence and size of the audio specification */ | |
| 414 SDL_CalculateAudioSpec(desired); | |
| 415 | |
| 416 /* Open the audio subsystem */ | |
| 417 memcpy(&audio->spec, desired, sizeof(audio->spec)); | |
| 418 audio->convert.needed = 0; | |
| 419 audio->enabled = 1; | |
| 420 audio->paused = 1; | |
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421 |
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422 #ifndef ENABLE_AHI |
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423 |
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424 /* AmigaOS opens audio inside the main loop */ |
| 0 | 425 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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426 |
| 0 | 427 if ( ! audio->opened ) { |
| 428 SDL_CloseAudio(); | |
| 429 return(-1); | |
| 430 } | |
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431 #else |
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432 D(bug("Locking semaphore...")); |
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433 SDL_mutexP(audio->mixer_lock); |
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434 |
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435 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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436 D(bug("Created thread...\n")); |
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437 |
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438 if ( audio->thread == NULL ) { |
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439 SDL_mutexV(audio->mixer_lock); |
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440 SDL_CloseAudio(); |
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441 SDL_SetError("Couldn't create audio thread"); |
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442 return(-1); |
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443 } |
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444 |
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445 while(!audio_configured) |
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446 SDL_Delay(100); |
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447 #endif |
| 0 | 448 |
| 449 /* If the audio driver changes the buffer size, accept it */ | |
| 450 if ( audio->spec.samples != desired->samples ) { | |
| 451 desired->samples = audio->spec.samples; | |
| 452 SDL_CalculateAudioSpec(desired); | |
| 453 } | |
| 454 | |
| 455 /* Allocate a fake audio memory buffer */ | |
| 456 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 457 if ( audio->fake_stream == NULL ) { | |
| 458 SDL_CloseAudio(); | |
| 459 SDL_OutOfMemory(); | |
| 460 return(-1); | |
| 461 } | |
| 462 | |
| 463 /* See if we need to do any conversion */ | |
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464 if ( obtained != NULL ) { |
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465 memcpy(obtained, &audio->spec, sizeof(audio->spec)); |
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466 } else if ( desired->freq != audio->spec.freq || |
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467 desired->format != audio->spec.format || |
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468 desired->channels != audio->spec.channels ) { |
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469 /* Build an audio conversion block */ |
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470 if ( SDL_BuildAudioCVT(&audio->convert, |
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471 desired->format, desired->channels, |
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472 desired->freq, |
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473 audio->spec.format, audio->spec.channels, |
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474 audio->spec.freq) < 0 ) { |
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475 SDL_CloseAudio(); |
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476 return(-1); |
| 0 | 477 } |
|
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478 if ( audio->convert.needed ) { |
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479 audio->convert.len = desired->size; |
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480 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( |
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481 audio->convert.len*audio->convert.len_mult); |
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482 if ( audio->convert.buf == NULL ) { |
| 0 | 483 SDL_CloseAudio(); |
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484 SDL_OutOfMemory(); |
| 0 | 485 return(-1); |
| 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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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 } |