Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 1199:2d6dc7de1145
From: Mike Frysinger <vapier@gentoo.org>
To: sdl@libsdl.org
Date: Sun, 11 Dec 2005 22:57:37 -0500
Subject: [SDL] exec stack in libsdl update
i posted back in September a patch to remove executable stacks:
http://www.devolution.com/pipermail/sdl/2005-September/070626.html
later in November, a similar patch was merged it seems:
http://www.libsdl.org/cgi/cvsweb.cgi/SDL12/src/hermes/mmx_main.asm
however, this lacks the additional output format checks that i posted in my
patch ... this isnt a problem if the hermes asm code is only ever used to
produce ELF objects, but if this is not true, then the additional checks in
my original patch will need to be merged
-mike
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Mon, 12 Dec 2005 09:13:12 +0000 |
| parents | 173c063d4f55 |
| children | f9794ee91dfc |
| 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 | |
| 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 } |