Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 1330:450721ad5436
It's now possible to build SDL without any C runtime at all on Windows,
using Visual C++ 2005
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 06 Feb 2006 08:28:51 +0000 |
| parents | c9b51268668f |
| children | 3692456e7b0f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 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 | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 /* Allow access to a raw mixing buffer */ | |
| 24 | |
| 25 #include "SDL.h" | |
| 26 #include "SDL_audio.h" | |
| 27 #include "SDL_timer.h" | |
| 28 #include "SDL_error.h" | |
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29 #include "SDL_string.h" |
| 0 | 30 #include "SDL_audio_c.h" |
| 31 #include "SDL_audiomem.h" | |
| 32 #include "SDL_sysaudio.h" | |
| 33 | |
| 1190 | 34 #ifdef __OS2__ |
| 35 // We'll need the DosSetPriority() API! | |
| 36 #define INCL_DOSPROCESS | |
| 37 #include <os2.h> | |
| 38 #endif | |
| 39 | |
| 0 | 40 /* Available audio drivers */ |
| 41 static AudioBootStrap *bootstrap[] = { | |
|
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42 #ifdef OPENBSD_AUDIO_SUPPORT |
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43 &OPENBSD_AUDIO_bootstrap, |
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44 #endif |
| 0 | 45 #ifdef OSS_SUPPORT |
| 46 &DSP_bootstrap, | |
| 47 &DMA_bootstrap, | |
| 48 #endif | |
| 49 #ifdef ALSA_SUPPORT | |
| 50 &ALSA_bootstrap, | |
| 51 #endif | |
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52 #ifdef QNXNTOAUDIO_SUPPORT |
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53 &QNXNTOAUDIO_bootstrap, |
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54 #endif |
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55 #ifdef SUNAUDIO_SUPPORT |
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56 &SUNAUDIO_bootstrap, |
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57 #endif |
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58 #ifdef DMEDIA_SUPPORT |
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59 &DMEDIA_bootstrap, |
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60 #endif |
| 0 | 61 #ifdef ARTSC_SUPPORT |
| 62 &ARTSC_bootstrap, | |
| 63 #endif | |
| 64 #ifdef ESD_SUPPORT | |
| 65 &ESD_bootstrap, | |
| 66 #endif | |
| 67 #ifdef NAS_SUPPORT | |
| 68 &NAS_bootstrap, | |
| 69 #endif | |
| 70 #ifdef ENABLE_DIRECTX | |
| 71 &DSOUND_bootstrap, | |
| 72 #endif | |
| 73 #ifdef ENABLE_WINDIB | |
| 74 &WAVEOUT_bootstrap, | |
| 75 #endif | |
| 76 #ifdef __BEOS__ | |
| 77 &BAUDIO_bootstrap, | |
| 78 #endif | |
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79 #ifdef MACOSX |
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80 &COREAUDIO_bootstrap, |
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81 #endif |
| 0 | 82 #if defined(macintosh) || TARGET_API_MAC_CARBON |
| 83 &SNDMGR_bootstrap, | |
| 84 #endif | |
| 85 #ifdef _AIX | |
| 86 &Paud_bootstrap, | |
| 87 #endif | |
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88 #ifdef ENABLE_AHI |
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89 &AHI_bootstrap, |
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90 #endif |
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91 #ifdef MMEAUDIO_SUPPORT |
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92 &MMEAUDIO_bootstrap, |
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93 #endif |
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94 #ifdef MINTAUDIO_SUPPORT |
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95 &MINTAUDIO_GSXB_bootstrap, |
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96 &MINTAUDIO_MCSN_bootstrap, |
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97 &MINTAUDIO_STFA_bootstrap, |
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98 &MINTAUDIO_XBIOS_bootstrap, |
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99 &MINTAUDIO_DMA8_bootstrap, |
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100 #endif |
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101 #ifdef DISKAUD_SUPPORT |
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102 &DISKAUD_bootstrap, |
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103 #endif |
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104 #ifdef ENABLE_DC |
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105 &DCAUD_bootstrap, |
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106 #endif |
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107 #ifdef DRENDERER_SUPPORT |
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108 &DRENDERER_bootstrap, |
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109 #endif |
| 1190 | 110 #ifdef __OS2__ |
| 111 &DART_bootstrap, | |
| 112 #endif | |
| 0 | 113 NULL |
| 114 }; | |
| 115 SDL_AudioDevice *current_audio = NULL; | |
| 116 | |
| 117 /* Various local functions */ | |
| 118 int SDL_AudioInit(const char *driver_name); | |
| 119 void SDL_AudioQuit(void); | |
| 120 | |
|
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121 #ifdef ENABLE_AHI |
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122 static int audio_configured = 0; |
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123 #endif |
| 0 | 124 |
| 125 /* The general mixing thread function */ | |
| 126 int SDL_RunAudio(void *audiop) | |
| 127 { | |
| 128 SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; | |
| 129 Uint8 *stream; | |
| 130 int stream_len; | |
| 131 void *udata; | |
| 132 void (*fill)(void *userdata,Uint8 *stream, int len); | |
| 133 int silence; | |
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134 #ifdef ENABLE_AHI |
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135 int started = 0; |
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136 |
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137 /* AmigaOS NEEDS that the audio driver is opened in the thread that uses it! */ |
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138 |
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139 D(bug("Task audio started audio struct:<%lx>...\n",audiop)); |
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140 |
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141 D(bug("Before Openaudio...")); |
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142 if(audio->OpenAudio(audio, &audio->spec)==-1) |
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143 { |
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144 D(bug("Open audio failed...\n")); |
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145 return(-1); |
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146 } |
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147 D(bug("OpenAudio...OK\n")); |
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148 #endif |
| 0 | 149 |
| 150 /* Perform any thread setup */ | |
| 151 if ( audio->ThreadInit ) { | |
| 152 audio->ThreadInit(audio); | |
| 153 } | |
| 154 audio->threadid = SDL_ThreadID(); | |
| 155 | |
| 156 /* Set up the mixing function */ | |
| 157 fill = audio->spec.callback; | |
| 158 udata = audio->spec.userdata; | |
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159 |
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160 #ifdef ENABLE_AHI |
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161 audio_configured = 1; |
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162 |
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163 D(bug("Audio configured... Checking for conversion\n")); |
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164 SDL_mutexP(audio->mixer_lock); |
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165 D(bug("Semaphore obtained...\n")); |
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166 #endif |
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167 |
| 0 | 168 if ( audio->convert.needed ) { |
| 169 if ( audio->convert.src_format == AUDIO_U8 ) { | |
| 170 silence = 0x80; | |
| 171 } else { | |
| 172 silence = 0; | |
| 173 } | |
| 174 stream_len = audio->convert.len; | |
| 175 } else { | |
| 176 silence = audio->spec.silence; | |
| 177 stream_len = audio->spec.size; | |
| 178 } | |
| 179 stream = audio->fake_stream; | |
| 180 | |
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181 #ifdef ENABLE_AHI |
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182 SDL_mutexV(audio->mixer_lock); |
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183 D(bug("Entering audio loop...\n")); |
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184 #endif |
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185 |
| 1190 | 186 #ifdef __OS2__ |
| 187 // Increase the priority of this thread to make sure that | |
| 188 // the audio will be continuous all the time! | |
| 189 #ifdef USE_DOSSETPRIORITY | |
| 190 #ifdef DEBUG_BUILD | |
| 191 printf("[SDL_RunAudio] : Setting priority to ForegroundServer+0! (TID%d)\n", SDL_ThreadID()); | |
| 192 #endif | |
| 193 DosSetPriority(PRTYS_THREAD, PRTYC_FOREGROUNDSERVER, 0, 0); | |
| 194 #endif | |
| 195 #endif | |
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196 |
| 0 | 197 /* Loop, filling the audio buffers */ |
| 198 while ( audio->enabled ) { | |
| 199 | |
| 200 /* Wait for new current buffer to finish playing */ | |
| 201 if ( stream == audio->fake_stream ) { | |
| 202 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); | |
| 203 } else { | |
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204 #ifdef ENABLE_AHI |
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205 if ( started > 1 ) |
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206 #endif |
| 0 | 207 audio->WaitAudio(audio); |
| 208 } | |
| 209 | |
| 210 /* Fill the current buffer with sound */ | |
| 211 if ( audio->convert.needed ) { | |
| 212 if ( audio->convert.buf ) { | |
| 213 stream = audio->convert.buf; | |
| 214 } else { | |
| 215 continue; | |
| 216 } | |
| 217 } else { | |
| 218 stream = audio->GetAudioBuf(audio); | |
| 219 if ( stream == NULL ) { | |
| 220 stream = audio->fake_stream; | |
| 221 } | |
| 222 } | |
| 223 memset(stream, silence, stream_len); | |
| 224 | |
| 225 if ( ! audio->paused ) { | |
| 226 SDL_mutexP(audio->mixer_lock); | |
| 227 (*fill)(udata, stream, stream_len); | |
| 228 SDL_mutexV(audio->mixer_lock); | |
| 229 } | |
| 230 | |
| 231 /* Convert the audio if necessary */ | |
| 232 if ( audio->convert.needed ) { | |
| 233 SDL_ConvertAudio(&audio->convert); | |
| 234 stream = audio->GetAudioBuf(audio); | |
| 235 if ( stream == NULL ) { | |
| 236 stream = audio->fake_stream; | |
| 237 } | |
| 238 memcpy(stream, audio->convert.buf, | |
| 239 audio->convert.len_cvt); | |
| 240 } | |
| 241 | |
| 242 /* Ready current buffer for play and change current buffer */ | |
| 243 if ( stream != audio->fake_stream ) { | |
| 244 audio->PlayAudio(audio); | |
|
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245 #ifdef ENABLE_AHI |
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246 /* AmigaOS don't have to wait the first time audio is played! */ |
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247 started++; |
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248 #endif |
| 0 | 249 } |
| 250 } | |
| 251 /* Wait for the audio to drain.. */ | |
| 252 if ( audio->WaitDone ) { | |
| 253 audio->WaitDone(audio); | |
| 254 } | |
|
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255 |
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256 #ifdef ENABLE_AHI |
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257 D(bug("WaitAudio...Done\n")); |
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258 |
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259 audio->CloseAudio(audio); |
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260 |
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261 D(bug("CloseAudio..Done, subtask exiting...\n")); |
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262 audio_configured = 0; |
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263 #endif |
| 1190 | 264 #ifdef __OS2__ |
| 265 #ifdef DEBUG_BUILD | |
| 266 printf("[SDL_RunAudio] : Task exiting. (TID%d)\n", SDL_ThreadID()); | |
| 267 #endif | |
| 268 #endif | |
| 0 | 269 return(0); |
| 270 } | |
| 271 | |
|
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272 static void SDL_LockAudio_Default(SDL_AudioDevice *audio) |
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273 { |
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274 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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275 return; |
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276 } |
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277 SDL_mutexP(audio->mixer_lock); |
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278 } |
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279 |
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280 static void SDL_UnlockAudio_Default(SDL_AudioDevice *audio) |
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281 { |
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282 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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283 return; |
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284 } |
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285 SDL_mutexV(audio->mixer_lock); |
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286 } |
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287 |
| 0 | 288 int SDL_AudioInit(const char *driver_name) |
| 289 { | |
| 290 SDL_AudioDevice *audio; | |
| 291 int i = 0, idx; | |
| 292 | |
| 293 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 294 if ( current_audio != NULL ) { | |
| 295 SDL_AudioQuit(); | |
| 296 } | |
| 297 | |
| 298 /* Select the proper audio driver */ | |
| 299 audio = NULL; | |
| 300 idx = 0; | |
| 301 #ifdef unix | |
| 302 if ( (driver_name == NULL) && (getenv("ESPEAKER") != NULL) ) { | |
| 303 /* Ahem, we know that if ESPEAKER is set, user probably wants | |
| 304 to use ESD, but don't start it if it's not already running. | |
| 305 This probably isn't the place to do this, but... Shh! :) | |
| 306 */ | |
| 307 for ( i=0; bootstrap[i]; ++i ) { | |
| 308 if ( strcmp(bootstrap[i]->name, "esd") == 0 ) { | |
| 309 const char *esd_no_spawn; | |
| 310 | |
| 311 /* Don't start ESD if it's not running */ | |
| 312 esd_no_spawn = getenv("ESD_NO_SPAWN"); | |
| 313 if ( esd_no_spawn == NULL ) { | |
| 314 putenv("ESD_NO_SPAWN=1"); | |
| 315 } | |
| 316 if ( bootstrap[i]->available() ) { | |
| 317 audio = bootstrap[i]->create(0); | |
| 318 break; | |
| 319 } | |
| 320 #ifdef linux /* No unsetenv() on most platforms */ | |
| 321 if ( esd_no_spawn == NULL ) { | |
| 322 unsetenv("ESD_NO_SPAWN"); | |
| 323 } | |
| 324 #endif | |
| 325 } | |
| 326 } | |
| 327 } | |
| 328 #endif /* unix */ | |
| 329 if ( audio == NULL ) { | |
| 330 if ( driver_name != NULL ) { | |
| 331 #if 0 /* This will be replaced with a better driver selection API */ | |
| 332 if ( strrchr(driver_name, ':') != NULL ) { | |
| 333 idx = atoi(strrchr(driver_name, ':')+1); | |
| 334 } | |
| 335 #endif | |
| 336 for ( i=0; bootstrap[i]; ++i ) { | |
| 337 if (strncmp(bootstrap[i]->name, driver_name, | |
| 338 strlen(bootstrap[i]->name)) == 0) { | |
| 339 if ( bootstrap[i]->available() ) { | |
| 340 audio=bootstrap[i]->create(idx); | |
| 341 break; | |
| 342 } | |
| 343 } | |
| 344 } | |
| 345 } else { | |
| 346 for ( i=0; bootstrap[i]; ++i ) { | |
| 347 if ( bootstrap[i]->available() ) { | |
| 348 audio = bootstrap[i]->create(idx); | |
| 349 if ( audio != NULL ) { | |
| 350 break; | |
| 351 } | |
| 352 } | |
| 353 } | |
| 354 } | |
| 355 if ( audio == NULL ) { | |
| 356 SDL_SetError("No available audio device"); | |
| 357 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 358 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 359 */ | |
| 360 return(-1); | |
| 361 #endif | |
| 362 } | |
| 363 } | |
| 364 current_audio = audio; | |
| 365 if ( current_audio ) { | |
| 366 current_audio->name = bootstrap[i]->name; | |
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367 if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
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368 current_audio->LockAudio = SDL_LockAudio_Default; |
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369 current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
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370 } |
| 0 | 371 } |
| 372 return(0); | |
| 373 } | |
| 374 | |
| 375 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 376 { | |
| 377 if ( current_audio != NULL ) { | |
| 378 strncpy(namebuf, current_audio->name, maxlen-1); | |
| 379 namebuf[maxlen-1] = '\0'; | |
| 380 return(namebuf); | |
| 381 } | |
| 382 return(NULL); | |
| 383 } | |
| 384 | |
| 385 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 386 { | |
| 387 SDL_AudioDevice *audio; | |
| 388 | |
| 389 /* Start up the audio driver, if necessary */ | |
| 390 if ( ! current_audio ) { | |
| 391 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 392 (current_audio == NULL) ) { | |
| 393 return(-1); | |
| 394 } | |
| 395 } | |
| 396 audio = current_audio; | |
| 397 | |
|
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398 if (audio->opened) { |
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399 SDL_SetError("Audio device is already opened"); |
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400 return(-1); |
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401 } |
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402 |
| 0 | 403 /* Verify some parameters */ |
| 404 if ( desired->callback == NULL ) { | |
| 405 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 406 return(-1); | |
| 407 } | |
| 408 switch ( desired->channels ) { | |
| 409 case 1: /* Mono */ | |
| 410 case 2: /* Stereo */ | |
|
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411 case 4: /* surround */ |
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412 case 6: /* surround with center and lfe */ |
| 0 | 413 break; |
| 414 default: | |
| 415 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 416 return(-1); | |
| 417 } | |
| 418 | |
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419 #if defined(macintosh) || (defined(__riscos__) && defined(DISABLE_THREADS)) |
| 0 | 420 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ |
| 421 #else | |
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422 #if defined(__MINT__) && !defined(ENABLE_THREADS) |
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423 /* Uses interrupt driven audio, without thread */ |
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424 #else |
| 0 | 425 /* Create a semaphore for locking the sound buffers */ |
| 426 audio->mixer_lock = SDL_CreateMutex(); | |
| 427 if ( audio->mixer_lock == NULL ) { | |
| 428 SDL_SetError("Couldn't create mixer lock"); | |
| 429 SDL_CloseAudio(); | |
| 430 return(-1); | |
| 431 } | |
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432 #endif /* __MINT__ */ |
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433 #endif /* macintosh */ |
| 0 | 434 |
| 435 /* Calculate the silence and size of the audio specification */ | |
| 436 SDL_CalculateAudioSpec(desired); | |
| 437 | |
| 438 /* Open the audio subsystem */ | |
| 439 memcpy(&audio->spec, desired, sizeof(audio->spec)); | |
| 440 audio->convert.needed = 0; | |
| 441 audio->enabled = 1; | |
| 442 audio->paused = 1; | |
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443 |
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444 #ifndef ENABLE_AHI |
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445 |
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446 /* AmigaOS opens audio inside the main loop */ |
| 0 | 447 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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448 |
| 0 | 449 if ( ! audio->opened ) { |
| 450 SDL_CloseAudio(); | |
| 451 return(-1); | |
| 452 } | |
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453 #else |
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454 D(bug("Locking semaphore...")); |
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455 SDL_mutexP(audio->mixer_lock); |
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456 |
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457 #if (defined(_WIN32) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC) |
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458 #undef SDL_CreateThread |
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459 audio->thread = SDL_CreateThread(SDL_RunAudio, audio, NULL, NULL); |
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460 #else |
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461 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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462 #endif |
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463 D(bug("Created thread...\n")); |
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464 |
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465 if ( audio->thread == NULL ) { |
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466 SDL_mutexV(audio->mixer_lock); |
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467 SDL_CloseAudio(); |
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468 SDL_SetError("Couldn't create audio thread"); |
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469 return(-1); |
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470 } |
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471 |
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472 while(!audio_configured) |
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473 SDL_Delay(100); |
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474 #endif |
| 0 | 475 |
| 476 /* If the audio driver changes the buffer size, accept it */ | |
| 477 if ( audio->spec.samples != desired->samples ) { | |
| 478 desired->samples = audio->spec.samples; | |
| 479 SDL_CalculateAudioSpec(desired); | |
| 480 } | |
| 481 | |
| 482 /* Allocate a fake audio memory buffer */ | |
| 483 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 484 if ( audio->fake_stream == NULL ) { | |
| 485 SDL_CloseAudio(); | |
| 486 SDL_OutOfMemory(); | |
| 487 return(-1); | |
| 488 } | |
| 489 | |
| 490 /* See if we need to do any conversion */ | |
|
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491 if ( obtained != NULL ) { |
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492 memcpy(obtained, &audio->spec, sizeof(audio->spec)); |
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493 } else if ( desired->freq != audio->spec.freq || |
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494 desired->format != audio->spec.format || |
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495 desired->channels != audio->spec.channels ) { |
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496 /* Build an audio conversion block */ |
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497 if ( SDL_BuildAudioCVT(&audio->convert, |
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498 desired->format, desired->channels, |
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499 desired->freq, |
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500 audio->spec.format, audio->spec.channels, |
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501 audio->spec.freq) < 0 ) { |
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502 SDL_CloseAudio(); |
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503 return(-1); |
| 0 | 504 } |
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505 if ( audio->convert.needed ) { |
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506 audio->convert.len = desired->size; |
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507 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( |
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508 audio->convert.len*audio->convert.len_mult); |
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509 if ( audio->convert.buf == NULL ) { |
| 0 | 510 SDL_CloseAudio(); |
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511 SDL_OutOfMemory(); |
| 0 | 512 return(-1); |
| 513 } | |
| 514 } | |
| 515 } | |
| 516 | |
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517 #ifndef ENABLE_AHI |
| 0 | 518 /* Start the audio thread if necessary */ |
| 519 switch (audio->opened) { | |
| 520 case 1: | |
| 521 /* Start the audio thread */ | |
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522 #if (defined(_WIN32) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC) |
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523 #undef SDL_CreateThread |
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524 audio->thread = SDL_CreateThread(SDL_RunAudio, audio, NULL, NULL); |
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525 #else |
| 0 | 526 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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527 #endif |
| 0 | 528 if ( audio->thread == NULL ) { |
| 529 SDL_CloseAudio(); | |
| 530 SDL_SetError("Couldn't create audio thread"); | |
| 531 return(-1); | |
| 532 } | |
| 533 break; | |
| 534 | |
| 535 default: | |
| 536 /* The audio is now playing */ | |
| 537 break; | |
| 538 } | |
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539 #else |
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540 SDL_mutexV(audio->mixer_lock); |
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541 D(bug("SDL_OpenAudio USCITA...\n")); |
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542 |
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543 #endif |
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544 |
| 0 | 545 return(0); |
| 546 } | |
| 547 | |
| 548 SDL_audiostatus SDL_GetAudioStatus(void) | |
| 549 { | |
| 550 SDL_AudioDevice *audio = current_audio; | |
| 551 SDL_audiostatus status; | |
| 552 | |
| 553 status = SDL_AUDIO_STOPPED; | |
| 554 if ( audio && audio->enabled ) { | |
| 555 if ( audio->paused ) { | |
| 556 status = SDL_AUDIO_PAUSED; | |
| 557 } else { | |
| 558 status = SDL_AUDIO_PLAYING; | |
| 559 } | |
| 560 } | |
| 561 return(status); | |
| 562 } | |
| 563 | |
| 564 void SDL_PauseAudio (int pause_on) | |
| 565 { | |
| 566 SDL_AudioDevice *audio = current_audio; | |
| 567 | |
| 568 if ( audio ) { | |
| 569 audio->paused = pause_on; | |
| 570 } | |
| 571 } | |
| 572 | |
| 573 void SDL_LockAudio (void) | |
| 574 { | |
| 575 SDL_AudioDevice *audio = current_audio; | |
| 576 | |
| 577 /* Obtain a lock on the mixing buffers */ | |
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578 if ( audio && audio->LockAudio ) { |
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579 audio->LockAudio(audio); |
| 0 | 580 } |
| 581 } | |
| 582 | |
| 583 void SDL_UnlockAudio (void) | |
| 584 { | |
| 585 SDL_AudioDevice *audio = current_audio; | |
| 586 | |
| 587 /* Release lock on the mixing buffers */ | |
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588 if ( audio && audio->UnlockAudio ) { |
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589 audio->UnlockAudio(audio); |
| 0 | 590 } |
| 591 } | |
| 592 | |
| 593 void SDL_CloseAudio (void) | |
| 594 { | |
| 595 SDL_QuitSubSystem(SDL_INIT_AUDIO); | |
| 596 } | |
| 597 | |
| 598 void SDL_AudioQuit(void) | |
| 599 { | |
| 600 SDL_AudioDevice *audio = current_audio; | |
| 601 | |
| 602 if ( audio ) { | |
| 603 audio->enabled = 0; | |
| 604 if ( audio->thread != NULL ) { | |
| 605 SDL_WaitThread(audio->thread, NULL); | |
| 606 } | |
| 607 if ( audio->mixer_lock != NULL ) { | |
| 608 SDL_DestroyMutex(audio->mixer_lock); | |
| 609 } | |
| 610 if ( audio->fake_stream != NULL ) { | |
| 611 SDL_FreeAudioMem(audio->fake_stream); | |
| 612 } | |
| 613 if ( audio->convert.needed ) { | |
| 614 SDL_FreeAudioMem(audio->convert.buf); | |
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615 |
| 0 | 616 } |
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617 #ifndef ENABLE_AHI |
| 0 | 618 if ( audio->opened ) { |
| 619 audio->CloseAudio(audio); | |
| 620 audio->opened = 0; | |
| 621 } | |
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622 #endif |
| 0 | 623 /* Free the driver data */ |
| 624 audio->free(audio); | |
| 625 current_audio = NULL; | |
| 626 } | |
| 627 } | |
| 628 | |
| 629 #define NUM_FORMATS 6 | |
| 630 static int format_idx; | |
| 631 static int format_idx_sub; | |
| 632 static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { | |
| 633 { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 634 { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 635 { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 636 { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 637 { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 638 { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 639 }; | |
| 640 | |
| 641 Uint16 SDL_FirstAudioFormat(Uint16 format) | |
| 642 { | |
| 643 for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { | |
| 644 if ( format_list[format_idx][0] == format ) { | |
| 645 break; | |
| 646 } | |
| 647 } | |
| 648 format_idx_sub = 0; | |
| 649 return(SDL_NextAudioFormat()); | |
| 650 } | |
| 651 | |
| 652 Uint16 SDL_NextAudioFormat(void) | |
| 653 { | |
| 654 if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { | |
| 655 return(0); | |
| 656 } | |
| 657 return(format_list[format_idx][format_idx_sub++]); | |
| 658 } | |
| 659 | |
| 660 void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) | |
| 661 { | |
| 662 switch (spec->format) { | |
| 663 case AUDIO_U8: | |
| 664 spec->silence = 0x80; | |
| 665 break; | |
| 666 default: | |
| 667 spec->silence = 0x00; | |
| 668 break; | |
| 669 } | |
| 670 spec->size = (spec->format&0xFF)/8; | |
| 671 spec->size *= spec->channels; | |
| 672 spec->size *= spec->samples; | |
| 673 } |