Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 1204:f9794ee91dfc
Date: Tue, 13 Dec 2005 13:33:50 +0000
From: "alan buckley"
Subject: Patch to fix audio locking on RISC OS
When threads were not disabled on a RISC OS build
the audio mixer mutex was not created.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 13 Dec 2005 16:40:12 +0000 |
| parents | 173c063d4f55 |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2004 (Happy New Year!)
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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 | |
| 1190 | 41 #ifdef __OS2__ |
| 42 // We'll need the DosSetPriority() API! | |
| 43 #define INCL_DOSPROCESS | |
| 44 #include <os2.h> | |
| 45 #endif | |
| 46 | |
| 0 | 47 /* Available audio drivers */ |
| 48 static AudioBootStrap *bootstrap[] = { | |
|
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49 #ifdef OPENBSD_AUDIO_SUPPORT |
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50 &OPENBSD_AUDIO_bootstrap, |
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51 #endif |
| 0 | 52 #ifdef OSS_SUPPORT |
| 53 &DSP_bootstrap, | |
| 54 &DMA_bootstrap, | |
| 55 #endif | |
| 56 #ifdef ALSA_SUPPORT | |
| 57 &ALSA_bootstrap, | |
| 58 #endif | |
|
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59 #ifdef QNXNTOAUDIO_SUPPORT |
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60 &QNXNTOAUDIO_bootstrap, |
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61 #endif |
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62 #ifdef SUNAUDIO_SUPPORT |
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63 &SUNAUDIO_bootstrap, |
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64 #endif |
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65 #ifdef DMEDIA_SUPPORT |
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66 &DMEDIA_bootstrap, |
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67 #endif |
| 0 | 68 #ifdef ARTSC_SUPPORT |
| 69 &ARTSC_bootstrap, | |
| 70 #endif | |
| 71 #ifdef ESD_SUPPORT | |
| 72 &ESD_bootstrap, | |
| 73 #endif | |
| 74 #ifdef NAS_SUPPORT | |
| 75 &NAS_bootstrap, | |
| 76 #endif | |
| 77 #ifdef ENABLE_DIRECTX | |
| 78 &DSOUND_bootstrap, | |
| 79 #endif | |
| 80 #ifdef ENABLE_WINDIB | |
| 81 &WAVEOUT_bootstrap, | |
| 82 #endif | |
| 83 #ifdef __BEOS__ | |
| 84 &BAUDIO_bootstrap, | |
| 85 #endif | |
|
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86 #ifdef MACOSX |
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87 &COREAUDIO_bootstrap, |
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88 #endif |
| 0 | 89 #if defined(macintosh) || TARGET_API_MAC_CARBON |
| 90 &SNDMGR_bootstrap, | |
| 91 #endif | |
| 92 #ifdef _AIX | |
| 93 &Paud_bootstrap, | |
| 94 #endif | |
|
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95 #ifdef ENABLE_AHI |
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96 &AHI_bootstrap, |
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97 #endif |
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98 #ifdef MMEAUDIO_SUPPORT |
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99 &MMEAUDIO_bootstrap, |
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100 #endif |
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101 #ifdef MINTAUDIO_SUPPORT |
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102 &MINTAUDIO_GSXB_bootstrap, |
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103 &MINTAUDIO_MCSN_bootstrap, |
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104 &MINTAUDIO_STFA_bootstrap, |
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105 &MINTAUDIO_XBIOS_bootstrap, |
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106 &MINTAUDIO_DMA8_bootstrap, |
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107 #endif |
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108 #ifdef DISKAUD_SUPPORT |
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109 &DISKAUD_bootstrap, |
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110 #endif |
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111 #ifdef ENABLE_DC |
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112 &DCAUD_bootstrap, |
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113 #endif |
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114 #ifdef DRENDERER_SUPPORT |
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115 &DRENDERER_bootstrap, |
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116 #endif |
| 1190 | 117 #ifdef __OS2__ |
| 118 &DART_bootstrap, | |
| 119 #endif | |
| 0 | 120 NULL |
| 121 }; | |
| 122 SDL_AudioDevice *current_audio = NULL; | |
| 123 | |
| 124 /* Various local functions */ | |
| 125 int SDL_AudioInit(const char *driver_name); | |
| 126 void SDL_AudioQuit(void); | |
| 127 | |
|
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128 #ifdef ENABLE_AHI |
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129 static int audio_configured = 0; |
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130 #endif |
| 0 | 131 |
| 132 /* The general mixing thread function */ | |
| 133 int SDL_RunAudio(void *audiop) | |
| 134 { | |
| 135 SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; | |
| 136 Uint8 *stream; | |
| 137 int stream_len; | |
| 138 void *udata; | |
| 139 void (*fill)(void *userdata,Uint8 *stream, int len); | |
| 140 int silence; | |
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141 #ifdef ENABLE_AHI |
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142 int started = 0; |
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143 |
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144 /* AmigaOS NEEDS that the audio driver is opened in the thread that uses it! */ |
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145 |
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146 D(bug("Task audio started audio struct:<%lx>...\n",audiop)); |
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147 |
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148 D(bug("Before Openaudio...")); |
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149 if(audio->OpenAudio(audio, &audio->spec)==-1) |
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150 { |
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151 D(bug("Open audio failed...\n")); |
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152 return(-1); |
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153 } |
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154 D(bug("OpenAudio...OK\n")); |
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155 #endif |
| 0 | 156 |
| 157 /* Perform any thread setup */ | |
| 158 if ( audio->ThreadInit ) { | |
| 159 audio->ThreadInit(audio); | |
| 160 } | |
| 161 audio->threadid = SDL_ThreadID(); | |
| 162 | |
| 163 /* Set up the mixing function */ | |
| 164 fill = audio->spec.callback; | |
| 165 udata = audio->spec.userdata; | |
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166 |
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167 #ifdef ENABLE_AHI |
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168 audio_configured = 1; |
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169 |
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170 D(bug("Audio configured... Checking for conversion\n")); |
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171 SDL_mutexP(audio->mixer_lock); |
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172 D(bug("Semaphore obtained...\n")); |
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173 #endif |
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174 |
| 0 | 175 if ( audio->convert.needed ) { |
| 176 if ( audio->convert.src_format == AUDIO_U8 ) { | |
| 177 silence = 0x80; | |
| 178 } else { | |
| 179 silence = 0; | |
| 180 } | |
| 181 stream_len = audio->convert.len; | |
| 182 } else { | |
| 183 silence = audio->spec.silence; | |
| 184 stream_len = audio->spec.size; | |
| 185 } | |
| 186 stream = audio->fake_stream; | |
| 187 | |
|
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188 #ifdef ENABLE_AHI |
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189 SDL_mutexV(audio->mixer_lock); |
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190 D(bug("Entering audio loop...\n")); |
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191 #endif |
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192 |
| 1190 | 193 #ifdef __OS2__ |
| 194 // Increase the priority of this thread to make sure that | |
| 195 // the audio will be continuous all the time! | |
| 196 #ifdef USE_DOSSETPRIORITY | |
| 197 #ifdef DEBUG_BUILD | |
| 198 printf("[SDL_RunAudio] : Setting priority to ForegroundServer+0! (TID%d)\n", SDL_ThreadID()); | |
| 199 #endif | |
| 200 DosSetPriority(PRTYS_THREAD, PRTYC_FOREGROUNDSERVER, 0, 0); | |
| 201 #endif | |
| 202 #endif | |
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203 |
| 0 | 204 /* Loop, filling the audio buffers */ |
| 205 while ( audio->enabled ) { | |
| 206 | |
| 207 /* Wait for new current buffer to finish playing */ | |
| 208 if ( stream == audio->fake_stream ) { | |
| 209 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); | |
| 210 } else { | |
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211 #ifdef ENABLE_AHI |
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212 if ( started > 1 ) |
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213 #endif |
| 0 | 214 audio->WaitAudio(audio); |
| 215 } | |
| 216 | |
| 217 /* Fill the current buffer with sound */ | |
| 218 if ( audio->convert.needed ) { | |
| 219 if ( audio->convert.buf ) { | |
| 220 stream = audio->convert.buf; | |
| 221 } else { | |
| 222 continue; | |
| 223 } | |
| 224 } else { | |
| 225 stream = audio->GetAudioBuf(audio); | |
| 226 if ( stream == NULL ) { | |
| 227 stream = audio->fake_stream; | |
| 228 } | |
| 229 } | |
| 230 memset(stream, silence, stream_len); | |
| 231 | |
| 232 if ( ! audio->paused ) { | |
| 233 SDL_mutexP(audio->mixer_lock); | |
| 234 (*fill)(udata, stream, stream_len); | |
| 235 SDL_mutexV(audio->mixer_lock); | |
| 236 } | |
| 237 | |
| 238 /* Convert the audio if necessary */ | |
| 239 if ( audio->convert.needed ) { | |
| 240 SDL_ConvertAudio(&audio->convert); | |
| 241 stream = audio->GetAudioBuf(audio); | |
| 242 if ( stream == NULL ) { | |
| 243 stream = audio->fake_stream; | |
| 244 } | |
| 245 memcpy(stream, audio->convert.buf, | |
| 246 audio->convert.len_cvt); | |
| 247 } | |
| 248 | |
| 249 /* Ready current buffer for play and change current buffer */ | |
| 250 if ( stream != audio->fake_stream ) { | |
| 251 audio->PlayAudio(audio); | |
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252 #ifdef ENABLE_AHI |
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253 /* AmigaOS don't have to wait the first time audio is played! */ |
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254 started++; |
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255 #endif |
| 0 | 256 } |
| 257 } | |
| 258 /* Wait for the audio to drain.. */ | |
| 259 if ( audio->WaitDone ) { | |
| 260 audio->WaitDone(audio); | |
| 261 } | |
|
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262 |
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263 #ifdef ENABLE_AHI |
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264 D(bug("WaitAudio...Done\n")); |
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265 |
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266 audio->CloseAudio(audio); |
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267 |
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268 D(bug("CloseAudio..Done, subtask exiting...\n")); |
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269 audio_configured = 0; |
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270 #endif |
| 1190 | 271 #ifdef __OS2__ |
| 272 #ifdef DEBUG_BUILD | |
| 273 printf("[SDL_RunAudio] : Task exiting. (TID%d)\n", SDL_ThreadID()); | |
| 274 #endif | |
| 275 #endif | |
| 0 | 276 return(0); |
| 277 } | |
| 278 | |
|
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279 static void SDL_LockAudio_Default(SDL_AudioDevice *audio) |
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280 { |
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281 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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282 return; |
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283 } |
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284 SDL_mutexP(audio->mixer_lock); |
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285 } |
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286 |
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287 static void SDL_UnlockAudio_Default(SDL_AudioDevice *audio) |
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288 { |
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289 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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290 return; |
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291 } |
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292 SDL_mutexV(audio->mixer_lock); |
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293 } |
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294 |
| 0 | 295 int SDL_AudioInit(const char *driver_name) |
| 296 { | |
| 297 SDL_AudioDevice *audio; | |
| 298 int i = 0, idx; | |
| 299 | |
| 300 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 301 if ( current_audio != NULL ) { | |
| 302 SDL_AudioQuit(); | |
| 303 } | |
| 304 | |
| 305 /* Select the proper audio driver */ | |
| 306 audio = NULL; | |
| 307 idx = 0; | |
| 308 #ifdef unix | |
| 309 if ( (driver_name == NULL) && (getenv("ESPEAKER") != NULL) ) { | |
| 310 /* Ahem, we know that if ESPEAKER is set, user probably wants | |
| 311 to use ESD, but don't start it if it's not already running. | |
| 312 This probably isn't the place to do this, but... Shh! :) | |
| 313 */ | |
| 314 for ( i=0; bootstrap[i]; ++i ) { | |
| 315 if ( strcmp(bootstrap[i]->name, "esd") == 0 ) { | |
| 316 const char *esd_no_spawn; | |
| 317 | |
| 318 /* Don't start ESD if it's not running */ | |
| 319 esd_no_spawn = getenv("ESD_NO_SPAWN"); | |
| 320 if ( esd_no_spawn == NULL ) { | |
| 321 putenv("ESD_NO_SPAWN=1"); | |
| 322 } | |
| 323 if ( bootstrap[i]->available() ) { | |
| 324 audio = bootstrap[i]->create(0); | |
| 325 break; | |
| 326 } | |
| 327 #ifdef linux /* No unsetenv() on most platforms */ | |
| 328 if ( esd_no_spawn == NULL ) { | |
| 329 unsetenv("ESD_NO_SPAWN"); | |
| 330 } | |
| 331 #endif | |
| 332 } | |
| 333 } | |
| 334 } | |
| 335 #endif /* unix */ | |
| 336 if ( audio == NULL ) { | |
| 337 if ( driver_name != NULL ) { | |
| 338 #if 0 /* This will be replaced with a better driver selection API */ | |
| 339 if ( strrchr(driver_name, ':') != NULL ) { | |
| 340 idx = atoi(strrchr(driver_name, ':')+1); | |
| 341 } | |
| 342 #endif | |
| 343 for ( i=0; bootstrap[i]; ++i ) { | |
| 344 if (strncmp(bootstrap[i]->name, driver_name, | |
| 345 strlen(bootstrap[i]->name)) == 0) { | |
| 346 if ( bootstrap[i]->available() ) { | |
| 347 audio=bootstrap[i]->create(idx); | |
| 348 break; | |
| 349 } | |
| 350 } | |
| 351 } | |
| 352 } else { | |
| 353 for ( i=0; bootstrap[i]; ++i ) { | |
| 354 if ( bootstrap[i]->available() ) { | |
| 355 audio = bootstrap[i]->create(idx); | |
| 356 if ( audio != NULL ) { | |
| 357 break; | |
| 358 } | |
| 359 } | |
| 360 } | |
| 361 } | |
| 362 if ( audio == NULL ) { | |
| 363 SDL_SetError("No available audio device"); | |
| 364 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 365 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 366 */ | |
| 367 return(-1); | |
| 368 #endif | |
| 369 } | |
| 370 } | |
| 371 current_audio = audio; | |
| 372 if ( current_audio ) { | |
| 373 current_audio->name = bootstrap[i]->name; | |
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374 if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
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375 current_audio->LockAudio = SDL_LockAudio_Default; |
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376 current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
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377 } |
| 0 | 378 } |
| 379 return(0); | |
| 380 } | |
| 381 | |
| 382 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 383 { | |
| 384 if ( current_audio != NULL ) { | |
| 385 strncpy(namebuf, current_audio->name, maxlen-1); | |
| 386 namebuf[maxlen-1] = '\0'; | |
| 387 return(namebuf); | |
| 388 } | |
| 389 return(NULL); | |
| 390 } | |
| 391 | |
| 392 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 393 { | |
| 394 SDL_AudioDevice *audio; | |
| 395 | |
| 396 /* Start up the audio driver, if necessary */ | |
| 397 if ( ! current_audio ) { | |
| 398 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 399 (current_audio == NULL) ) { | |
| 400 return(-1); | |
| 401 } | |
| 402 } | |
| 403 audio = current_audio; | |
| 404 | |
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405 if (audio->opened) { |
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406 SDL_SetError("Audio device is already opened"); |
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407 return(-1); |
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408 } |
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409 |
| 0 | 410 /* Verify some parameters */ |
| 411 if ( desired->callback == NULL ) { | |
| 412 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 413 return(-1); | |
| 414 } | |
| 415 switch ( desired->channels ) { | |
| 416 case 1: /* Mono */ | |
| 417 case 2: /* Stereo */ | |
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418 case 4: /* surround */ |
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419 case 6: /* surround with center and lfe */ |
| 0 | 420 break; |
| 421 default: | |
| 422 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 423 return(-1); | |
| 424 } | |
| 425 | |
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426 #if defined(macintosh) || (defined(__riscos__) && defined(DISABLE_THREADS)) |
| 0 | 427 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ |
| 428 #else | |
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429 #if defined(__MINT__) && !defined(ENABLE_THREADS) |
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430 /* Uses interrupt driven audio, without thread */ |
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431 #else |
| 0 | 432 /* Create a semaphore for locking the sound buffers */ |
| 433 audio->mixer_lock = SDL_CreateMutex(); | |
| 434 if ( audio->mixer_lock == NULL ) { | |
| 435 SDL_SetError("Couldn't create mixer lock"); | |
| 436 SDL_CloseAudio(); | |
| 437 return(-1); | |
| 438 } | |
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439 #endif /* __MINT__ */ |
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440 #endif /* macintosh */ |
| 0 | 441 |
| 442 /* Calculate the silence and size of the audio specification */ | |
| 443 SDL_CalculateAudioSpec(desired); | |
| 444 | |
| 445 /* Open the audio subsystem */ | |
| 446 memcpy(&audio->spec, desired, sizeof(audio->spec)); | |
| 447 audio->convert.needed = 0; | |
| 448 audio->enabled = 1; | |
| 449 audio->paused = 1; | |
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450 |
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451 #ifndef ENABLE_AHI |
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452 |
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453 /* AmigaOS opens audio inside the main loop */ |
| 0 | 454 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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455 |
| 0 | 456 if ( ! audio->opened ) { |
| 457 SDL_CloseAudio(); | |
| 458 return(-1); | |
| 459 } | |
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460 #else |
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461 D(bug("Locking semaphore...")); |
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462 SDL_mutexP(audio->mixer_lock); |
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463 |
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464 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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465 D(bug("Created thread...\n")); |
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466 |
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467 if ( audio->thread == NULL ) { |
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468 SDL_mutexV(audio->mixer_lock); |
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469 SDL_CloseAudio(); |
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470 SDL_SetError("Couldn't create audio thread"); |
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471 return(-1); |
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472 } |
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473 |
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474 while(!audio_configured) |
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475 SDL_Delay(100); |
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476 #endif |
| 0 | 477 |
| 478 /* If the audio driver changes the buffer size, accept it */ | |
| 479 if ( audio->spec.samples != desired->samples ) { | |
| 480 desired->samples = audio->spec.samples; | |
| 481 SDL_CalculateAudioSpec(desired); | |
| 482 } | |
| 483 | |
| 484 /* Allocate a fake audio memory buffer */ | |
| 485 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 486 if ( audio->fake_stream == NULL ) { | |
| 487 SDL_CloseAudio(); | |
| 488 SDL_OutOfMemory(); | |
| 489 return(-1); | |
| 490 } | |
| 491 | |
| 492 /* See if we need to do any conversion */ | |
|
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493 if ( obtained != NULL ) { |
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494 memcpy(obtained, &audio->spec, sizeof(audio->spec)); |
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495 } else if ( desired->freq != audio->spec.freq || |
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496 desired->format != audio->spec.format || |
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497 desired->channels != audio->spec.channels ) { |
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498 /* Build an audio conversion block */ |
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499 if ( SDL_BuildAudioCVT(&audio->convert, |
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500 desired->format, desired->channels, |
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501 desired->freq, |
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502 audio->spec.format, audio->spec.channels, |
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503 audio->spec.freq) < 0 ) { |
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504 SDL_CloseAudio(); |
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505 return(-1); |
| 0 | 506 } |
|
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507 if ( audio->convert.needed ) { |
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508 audio->convert.len = desired->size; |
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509 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( |
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510 audio->convert.len*audio->convert.len_mult); |
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511 if ( audio->convert.buf == NULL ) { |
| 0 | 512 SDL_CloseAudio(); |
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513 SDL_OutOfMemory(); |
| 0 | 514 return(-1); |
| 515 } | |
| 516 } | |
| 517 } | |
| 518 | |
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519 #ifndef ENABLE_AHI |
| 0 | 520 /* Start the audio thread if necessary */ |
| 521 switch (audio->opened) { | |
| 522 case 1: | |
| 523 /* Start the audio thread */ | |
| 524 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); | |
| 525 if ( audio->thread == NULL ) { | |
| 526 SDL_CloseAudio(); | |
| 527 SDL_SetError("Couldn't create audio thread"); | |
| 528 return(-1); | |
| 529 } | |
| 530 break; | |
| 531 | |
| 532 default: | |
| 533 /* The audio is now playing */ | |
| 534 break; | |
| 535 } | |
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536 #else |
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537 SDL_mutexV(audio->mixer_lock); |
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538 D(bug("SDL_OpenAudio USCITA...\n")); |
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539 |
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540 #endif |
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541 |
| 0 | 542 return(0); |
| 543 } | |
| 544 | |
| 545 SDL_audiostatus SDL_GetAudioStatus(void) | |
| 546 { | |
| 547 SDL_AudioDevice *audio = current_audio; | |
| 548 SDL_audiostatus status; | |
| 549 | |
| 550 status = SDL_AUDIO_STOPPED; | |
| 551 if ( audio && audio->enabled ) { | |
| 552 if ( audio->paused ) { | |
| 553 status = SDL_AUDIO_PAUSED; | |
| 554 } else { | |
| 555 status = SDL_AUDIO_PLAYING; | |
| 556 } | |
| 557 } | |
| 558 return(status); | |
| 559 } | |
| 560 | |
| 561 void SDL_PauseAudio (int pause_on) | |
| 562 { | |
| 563 SDL_AudioDevice *audio = current_audio; | |
| 564 | |
| 565 if ( audio ) { | |
| 566 audio->paused = pause_on; | |
| 567 } | |
| 568 } | |
| 569 | |
| 570 void SDL_LockAudio (void) | |
| 571 { | |
| 572 SDL_AudioDevice *audio = current_audio; | |
| 573 | |
| 574 /* Obtain a lock on the mixing buffers */ | |
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575 if ( audio && audio->LockAudio ) { |
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576 audio->LockAudio(audio); |
| 0 | 577 } |
| 578 } | |
| 579 | |
| 580 void SDL_UnlockAudio (void) | |
| 581 { | |
| 582 SDL_AudioDevice *audio = current_audio; | |
| 583 | |
| 584 /* Release lock on the mixing buffers */ | |
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585 if ( audio && audio->UnlockAudio ) { |
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586 audio->UnlockAudio(audio); |
| 0 | 587 } |
| 588 } | |
| 589 | |
| 590 void SDL_CloseAudio (void) | |
| 591 { | |
| 592 SDL_QuitSubSystem(SDL_INIT_AUDIO); | |
| 593 } | |
| 594 | |
| 595 void SDL_AudioQuit(void) | |
| 596 { | |
| 597 SDL_AudioDevice *audio = current_audio; | |
| 598 | |
| 599 if ( audio ) { | |
| 600 audio->enabled = 0; | |
| 601 if ( audio->thread != NULL ) { | |
| 602 SDL_WaitThread(audio->thread, NULL); | |
| 603 } | |
| 604 if ( audio->mixer_lock != NULL ) { | |
| 605 SDL_DestroyMutex(audio->mixer_lock); | |
| 606 } | |
| 607 if ( audio->fake_stream != NULL ) { | |
| 608 SDL_FreeAudioMem(audio->fake_stream); | |
| 609 } | |
| 610 if ( audio->convert.needed ) { | |
| 611 SDL_FreeAudioMem(audio->convert.buf); | |
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612 |
| 0 | 613 } |
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614 #ifndef ENABLE_AHI |
| 0 | 615 if ( audio->opened ) { |
| 616 audio->CloseAudio(audio); | |
| 617 audio->opened = 0; | |
| 618 } | |
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619 #endif |
| 0 | 620 /* Free the driver data */ |
| 621 audio->free(audio); | |
| 622 current_audio = NULL; | |
| 623 } | |
| 624 } | |
| 625 | |
| 626 #define NUM_FORMATS 6 | |
| 627 static int format_idx; | |
| 628 static int format_idx_sub; | |
| 629 static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { | |
| 630 { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 631 { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 632 { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 633 { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 634 { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 635 { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 636 }; | |
| 637 | |
| 638 Uint16 SDL_FirstAudioFormat(Uint16 format) | |
| 639 { | |
| 640 for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { | |
| 641 if ( format_list[format_idx][0] == format ) { | |
| 642 break; | |
| 643 } | |
| 644 } | |
| 645 format_idx_sub = 0; | |
| 646 return(SDL_NextAudioFormat()); | |
| 647 } | |
| 648 | |
| 649 Uint16 SDL_NextAudioFormat(void) | |
| 650 { | |
| 651 if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { | |
| 652 return(0); | |
| 653 } | |
| 654 return(format_list[format_idx][format_idx_sub++]); | |
| 655 } | |
| 656 | |
| 657 void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) | |
| 658 { | |
| 659 switch (spec->format) { | |
| 660 case AUDIO_U8: | |
| 661 spec->silence = 0x80; | |
| 662 break; | |
| 663 default: | |
| 664 spec->silence = 0x00; | |
| 665 break; | |
| 666 } | |
| 667 spec->size = (spec->format&0xFF)/8; | |
| 668 spec->size *= spec->channels; | |
| 669 spec->size *= spec->samples; | |
| 670 } |