Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 779:68c8da837fc0
Date: Tue, 6 Jan 2004 21:54:02 +0100
From: Max Horn
Subject: Auto hide mouse & other changes
the attached bug adds the auto-hide-mouse feature I talked about
earlier. Turned out it was a lot simpler than I thought, simply by
using our existing code :-). I actually spent much more time on fixing
various bugs in the code and correcting (IMO) some behavior (although,
due to the lack of real specs for SDL, it's probably arguable what
'correct' means...).
* adds auto (un)hiding of mouse depending on whether it is in- or
outside the game window
* computation of course coordinates is correct now (it often and
reproducible got out of sync with the old code, since the NSEvent
window was in some cases *not* our window anymore, so locationInWindow
returned wrong results)
* added a method which at any time returns the mouse coords, relative
to our window
* fixed handling of lost/gain input/mouse/app focus "events"
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 07 Jan 2004 15:01:51 +0000 |
| parents | b8d311d90021 |
| children | 0defd90ef27c |
| 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 | |
| 41 /* Available audio drivers */ | |
| 42 static AudioBootStrap *bootstrap[] = { | |
|
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43 #ifdef OPENBSD_AUDIO_SUPPORT |
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44 &OPENBSD_AUDIO_bootstrap, |
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45 #endif |
| 0 | 46 #ifdef OSS_SUPPORT |
| 47 &DSP_bootstrap, | |
| 48 &DMA_bootstrap, | |
| 49 #endif | |
| 50 #ifdef ALSA_SUPPORT | |
| 51 &ALSA_bootstrap, | |
| 52 #endif | |
|
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53 #ifdef QNXNTOAUDIO_SUPPORT |
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54 &QNXNTOAUDIO_bootstrap, |
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55 #endif |
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56 #ifdef SUNAUDIO_SUPPORT |
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57 &SUNAUDIO_bootstrap, |
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58 #endif |
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59 #ifdef DMEDIA_SUPPORT |
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60 &DMEDIA_bootstrap, |
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61 #endif |
| 0 | 62 #ifdef ARTSC_SUPPORT |
| 63 &ARTSC_bootstrap, | |
| 64 #endif | |
| 65 #ifdef ESD_SUPPORT | |
| 66 &ESD_bootstrap, | |
| 67 #endif | |
| 68 #ifdef NAS_SUPPORT | |
| 69 &NAS_bootstrap, | |
| 70 #endif | |
| 71 #ifdef ENABLE_DIRECTX | |
| 72 &DSOUND_bootstrap, | |
| 73 #endif | |
| 74 #ifdef ENABLE_WINDIB | |
| 75 &WAVEOUT_bootstrap, | |
| 76 #endif | |
| 77 #ifdef __BEOS__ | |
| 78 &BAUDIO_bootstrap, | |
| 79 #endif | |
| 80 #if defined(macintosh) || TARGET_API_MAC_CARBON | |
| 81 &SNDMGR_bootstrap, | |
| 82 #endif | |
| 83 #ifdef _AIX | |
| 84 &Paud_bootstrap, | |
| 85 #endif | |
|
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86 #ifdef ENABLE_AHI |
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87 &AHI_bootstrap, |
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88 #endif |
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89 #ifdef MMEAUDIO_SUPPORT |
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90 &MMEAUDIO_bootstrap, |
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91 #endif |
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92 #ifdef MINTAUDIO_SUPPORT |
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93 &MINTAUDIO_GSXB_bootstrap, |
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94 &MINTAUDIO_MCSN_bootstrap, |
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95 &MINTAUDIO_STFA_bootstrap, |
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96 &MINTAUDIO_XBIOS_bootstrap, |
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97 &MINTAUDIO_DMA8_bootstrap, |
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98 #endif |
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99 #ifdef DISKAUD_SUPPORT |
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100 &DISKAUD_bootstrap, |
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101 #endif |
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102 #ifdef ENABLE_DC |
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103 &DCAUD_bootstrap, |
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104 #endif |
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105 #ifdef DRENDERER_SUPPORT |
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106 &DRENDERER_bootstrap, |
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107 #endif |
| 0 | 108 NULL |
| 109 }; | |
| 110 SDL_AudioDevice *current_audio = NULL; | |
| 111 | |
| 112 /* Various local functions */ | |
| 113 int SDL_AudioInit(const char *driver_name); | |
| 114 void SDL_AudioQuit(void); | |
| 115 | |
|
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116 #ifdef ENABLE_AHI |
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117 static int audio_configured = 0; |
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118 #endif |
| 0 | 119 |
| 120 /* The general mixing thread function */ | |
| 121 int SDL_RunAudio(void *audiop) | |
| 122 { | |
| 123 SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; | |
| 124 Uint8 *stream; | |
| 125 int stream_len; | |
| 126 void *udata; | |
| 127 void (*fill)(void *userdata,Uint8 *stream, int len); | |
| 128 int silence; | |
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129 #ifdef ENABLE_AHI |
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130 int started = 0; |
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131 |
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132 /* AmigaOS NEEDS that the audio driver is opened in the thread that uses it! */ |
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133 |
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134 D(bug("Task audio started audio struct:<%lx>...\n",audiop)); |
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135 |
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136 D(bug("Before Openaudio...")); |
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137 if(audio->OpenAudio(audio, &audio->spec)==-1) |
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138 { |
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139 D(bug("Open audio failed...\n")); |
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140 return(-1); |
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141 } |
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142 D(bug("OpenAudio...OK\n")); |
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143 #endif |
| 0 | 144 |
| 145 /* Perform any thread setup */ | |
| 146 if ( audio->ThreadInit ) { | |
| 147 audio->ThreadInit(audio); | |
| 148 } | |
| 149 audio->threadid = SDL_ThreadID(); | |
| 150 | |
| 151 /* Set up the mixing function */ | |
| 152 fill = audio->spec.callback; | |
| 153 udata = audio->spec.userdata; | |
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154 |
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155 #ifdef ENABLE_AHI |
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156 audio_configured = 1; |
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157 |
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158 D(bug("Audio configured... Checking for conversion\n")); |
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159 SDL_mutexP(audio->mixer_lock); |
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160 D(bug("Semaphore obtained...\n")); |
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161 #endif |
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162 |
| 0 | 163 if ( audio->convert.needed ) { |
| 164 if ( audio->convert.src_format == AUDIO_U8 ) { | |
| 165 silence = 0x80; | |
| 166 } else { | |
| 167 silence = 0; | |
| 168 } | |
| 169 stream_len = audio->convert.len; | |
| 170 } else { | |
| 171 silence = audio->spec.silence; | |
| 172 stream_len = audio->spec.size; | |
| 173 } | |
| 174 stream = audio->fake_stream; | |
| 175 | |
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176 #ifdef ENABLE_AHI |
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177 SDL_mutexV(audio->mixer_lock); |
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178 D(bug("Entering audio loop...\n")); |
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179 #endif |
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180 |
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181 |
| 0 | 182 /* Loop, filling the audio buffers */ |
| 183 while ( audio->enabled ) { | |
| 184 | |
| 185 /* Wait for new current buffer to finish playing */ | |
| 186 if ( stream == audio->fake_stream ) { | |
| 187 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); | |
| 188 } else { | |
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189 #ifdef ENABLE_AHI |
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190 if ( started > 1 ) |
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191 #endif |
| 0 | 192 audio->WaitAudio(audio); |
| 193 } | |
| 194 | |
| 195 /* Fill the current buffer with sound */ | |
| 196 if ( audio->convert.needed ) { | |
| 197 if ( audio->convert.buf ) { | |
| 198 stream = audio->convert.buf; | |
| 199 } else { | |
| 200 continue; | |
| 201 } | |
| 202 } else { | |
| 203 stream = audio->GetAudioBuf(audio); | |
| 204 if ( stream == NULL ) { | |
| 205 stream = audio->fake_stream; | |
| 206 } | |
| 207 } | |
| 208 memset(stream, silence, stream_len); | |
| 209 | |
| 210 if ( ! audio->paused ) { | |
| 211 SDL_mutexP(audio->mixer_lock); | |
| 212 (*fill)(udata, stream, stream_len); | |
| 213 SDL_mutexV(audio->mixer_lock); | |
| 214 } | |
| 215 | |
| 216 /* Convert the audio if necessary */ | |
| 217 if ( audio->convert.needed ) { | |
| 218 SDL_ConvertAudio(&audio->convert); | |
| 219 stream = audio->GetAudioBuf(audio); | |
| 220 if ( stream == NULL ) { | |
| 221 stream = audio->fake_stream; | |
| 222 } | |
| 223 memcpy(stream, audio->convert.buf, | |
| 224 audio->convert.len_cvt); | |
| 225 } | |
| 226 | |
| 227 /* Ready current buffer for play and change current buffer */ | |
| 228 if ( stream != audio->fake_stream ) { | |
| 229 audio->PlayAudio(audio); | |
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230 #ifdef ENABLE_AHI |
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231 /* AmigaOS don't have to wait the first time audio is played! */ |
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232 started++; |
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233 #endif |
| 0 | 234 } |
| 235 } | |
| 236 /* Wait for the audio to drain.. */ | |
| 237 if ( audio->WaitDone ) { | |
| 238 audio->WaitDone(audio); | |
| 239 } | |
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240 |
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241 #ifdef ENABLE_AHI |
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242 D(bug("WaitAudio...Done\n")); |
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243 |
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244 audio->CloseAudio(audio); |
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245 |
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246 D(bug("CloseAudio..Done, subtask exiting...\n")); |
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247 audio_configured = 0; |
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248 #endif |
| 0 | 249 return(0); |
| 250 } | |
| 251 | |
|
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252 static void SDL_LockAudio_Default(SDL_AudioDevice *audio) |
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253 { |
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254 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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255 return; |
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256 } |
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257 SDL_mutexP(audio->mixer_lock); |
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258 } |
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259 |
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260 static void SDL_UnlockAudio_Default(SDL_AudioDevice *audio) |
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261 { |
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262 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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263 return; |
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264 } |
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265 SDL_mutexV(audio->mixer_lock); |
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266 } |
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267 |
| 0 | 268 int SDL_AudioInit(const char *driver_name) |
| 269 { | |
| 270 SDL_AudioDevice *audio; | |
| 271 int i = 0, idx; | |
| 272 | |
| 273 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 274 if ( current_audio != NULL ) { | |
| 275 SDL_AudioQuit(); | |
| 276 } | |
| 277 | |
| 278 /* Select the proper audio driver */ | |
| 279 audio = NULL; | |
| 280 idx = 0; | |
| 281 #ifdef unix | |
| 282 if ( (driver_name == NULL) && (getenv("ESPEAKER") != NULL) ) { | |
| 283 /* Ahem, we know that if ESPEAKER is set, user probably wants | |
| 284 to use ESD, but don't start it if it's not already running. | |
| 285 This probably isn't the place to do this, but... Shh! :) | |
| 286 */ | |
| 287 for ( i=0; bootstrap[i]; ++i ) { | |
| 288 if ( strcmp(bootstrap[i]->name, "esd") == 0 ) { | |
| 289 const char *esd_no_spawn; | |
| 290 | |
| 291 /* Don't start ESD if it's not running */ | |
| 292 esd_no_spawn = getenv("ESD_NO_SPAWN"); | |
| 293 if ( esd_no_spawn == NULL ) { | |
| 294 putenv("ESD_NO_SPAWN=1"); | |
| 295 } | |
| 296 if ( bootstrap[i]->available() ) { | |
| 297 audio = bootstrap[i]->create(0); | |
| 298 break; | |
| 299 } | |
| 300 #ifdef linux /* No unsetenv() on most platforms */ | |
| 301 if ( esd_no_spawn == NULL ) { | |
| 302 unsetenv("ESD_NO_SPAWN"); | |
| 303 } | |
| 304 #endif | |
| 305 } | |
| 306 } | |
| 307 } | |
| 308 #endif /* unix */ | |
| 309 if ( audio == NULL ) { | |
| 310 if ( driver_name != NULL ) { | |
| 311 #if 0 /* This will be replaced with a better driver selection API */ | |
| 312 if ( strrchr(driver_name, ':') != NULL ) { | |
| 313 idx = atoi(strrchr(driver_name, ':')+1); | |
| 314 } | |
| 315 #endif | |
| 316 for ( i=0; bootstrap[i]; ++i ) { | |
| 317 if (strncmp(bootstrap[i]->name, driver_name, | |
| 318 strlen(bootstrap[i]->name)) == 0) { | |
| 319 if ( bootstrap[i]->available() ) { | |
| 320 audio=bootstrap[i]->create(idx); | |
| 321 break; | |
| 322 } | |
| 323 } | |
| 324 } | |
| 325 } else { | |
| 326 for ( i=0; bootstrap[i]; ++i ) { | |
| 327 if ( bootstrap[i]->available() ) { | |
| 328 audio = bootstrap[i]->create(idx); | |
| 329 if ( audio != NULL ) { | |
| 330 break; | |
| 331 } | |
| 332 } | |
| 333 } | |
| 334 } | |
| 335 if ( audio == NULL ) { | |
| 336 SDL_SetError("No available audio device"); | |
| 337 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 338 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 339 */ | |
| 340 return(-1); | |
| 341 #endif | |
| 342 } | |
| 343 } | |
| 344 current_audio = audio; | |
| 345 if ( current_audio ) { | |
| 346 current_audio->name = bootstrap[i]->name; | |
|
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347 if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
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348 current_audio->LockAudio = SDL_LockAudio_Default; |
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349 current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
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350 } |
| 0 | 351 } |
| 352 return(0); | |
| 353 } | |
| 354 | |
| 355 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 356 { | |
| 357 if ( current_audio != NULL ) { | |
| 358 strncpy(namebuf, current_audio->name, maxlen-1); | |
| 359 namebuf[maxlen-1] = '\0'; | |
| 360 return(namebuf); | |
| 361 } | |
| 362 return(NULL); | |
| 363 } | |
| 364 | |
| 365 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 366 { | |
| 367 SDL_AudioDevice *audio; | |
| 368 | |
| 369 /* Start up the audio driver, if necessary */ | |
| 370 if ( ! current_audio ) { | |
| 371 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 372 (current_audio == NULL) ) { | |
| 373 return(-1); | |
| 374 } | |
| 375 } | |
| 376 audio = current_audio; | |
| 377 | |
|
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378 if (audio->opened) { |
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379 SDL_SetError("Audio device is already opened"); |
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380 return(-1); |
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381 } |
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382 |
| 0 | 383 /* Verify some parameters */ |
| 384 if ( desired->callback == NULL ) { | |
| 385 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 386 return(-1); | |
| 387 } | |
| 388 switch ( desired->channels ) { | |
| 389 case 1: /* Mono */ | |
| 390 case 2: /* Stereo */ | |
| 391 break; | |
| 392 default: | |
| 393 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 394 return(-1); | |
| 395 } | |
| 396 | |
|
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397 #if defined(macintosh) || defined(__riscos__) |
| 0 | 398 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ |
| 399 #else | |
|
398
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400 #if defined(__MINT__) && !defined(ENABLE_THREADS) |
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401 /* Uses interrupt driven audio, without thread */ |
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402 #else |
| 0 | 403 /* Create a semaphore for locking the sound buffers */ |
| 404 audio->mixer_lock = SDL_CreateMutex(); | |
| 405 if ( audio->mixer_lock == NULL ) { | |
| 406 SDL_SetError("Couldn't create mixer lock"); | |
| 407 SDL_CloseAudio(); | |
| 408 return(-1); | |
| 409 } | |
|
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410 #endif /* __MINT__ */ |
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411 #endif /* macintosh */ |
| 0 | 412 |
| 413 /* Calculate the silence and size of the audio specification */ | |
| 414 SDL_CalculateAudioSpec(desired); | |
| 415 | |
| 416 /* Open the audio subsystem */ | |
| 417 memcpy(&audio->spec, desired, sizeof(audio->spec)); | |
| 418 audio->convert.needed = 0; | |
| 419 audio->enabled = 1; | |
| 420 audio->paused = 1; | |
|
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421 |
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422 #ifndef ENABLE_AHI |
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423 |
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424 /* AmigaOS opens audio inside the main loop */ |
| 0 | 425 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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426 |
| 0 | 427 if ( ! audio->opened ) { |
| 428 SDL_CloseAudio(); | |
| 429 return(-1); | |
| 430 } | |
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431 #else |
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432 D(bug("Locking semaphore...")); |
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433 SDL_mutexP(audio->mixer_lock); |
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434 |
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435 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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436 D(bug("Created thread...\n")); |
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437 |
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438 if ( audio->thread == NULL ) { |
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439 SDL_mutexV(audio->mixer_lock); |
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440 SDL_CloseAudio(); |
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441 SDL_SetError("Couldn't create audio thread"); |
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442 return(-1); |
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443 } |
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444 |
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445 while(!audio_configured) |
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446 SDL_Delay(100); |
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447 #endif |
| 0 | 448 |
| 449 /* If the audio driver changes the buffer size, accept it */ | |
| 450 if ( audio->spec.samples != desired->samples ) { | |
| 451 desired->samples = audio->spec.samples; | |
| 452 SDL_CalculateAudioSpec(desired); | |
| 453 } | |
| 454 | |
| 455 /* Allocate a fake audio memory buffer */ | |
| 456 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 457 if ( audio->fake_stream == NULL ) { | |
| 458 SDL_CloseAudio(); | |
| 459 SDL_OutOfMemory(); | |
| 460 return(-1); | |
| 461 } | |
| 462 | |
| 463 /* See if we need to do any conversion */ | |
| 464 if ( memcmp(desired, &audio->spec, sizeof(audio->spec)) == 0 ) { | |
| 465 /* Just copy over the desired audio specification */ | |
| 466 if ( obtained != NULL ) { | |
| 467 memcpy(obtained, &audio->spec, sizeof(audio->spec)); | |
| 468 } | |
| 469 } else { | |
| 470 /* Copy over the audio specification if possible */ | |
| 471 if ( obtained != NULL ) { | |
| 472 memcpy(obtained, &audio->spec, sizeof(audio->spec)); | |
| 473 } else { | |
| 474 /* Build an audio conversion block */ | |
| 475 if ( SDL_BuildAudioCVT(&audio->convert, | |
| 476 desired->format, desired->channels, | |
| 477 desired->freq, | |
| 478 audio->spec.format, audio->spec.channels, | |
| 479 audio->spec.freq) < 0 ) { | |
| 480 SDL_CloseAudio(); | |
| 481 return(-1); | |
| 482 } | |
| 483 if ( audio->convert.needed ) { | |
| 484 audio->convert.len = desired->size; | |
| 485 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( | |
| 486 audio->convert.len*audio->convert.len_mult); | |
| 487 if ( audio->convert.buf == NULL ) { | |
| 488 SDL_CloseAudio(); | |
| 489 SDL_OutOfMemory(); | |
| 490 return(-1); | |
| 491 } | |
| 492 } | |
| 493 } | |
| 494 } | |
| 495 | |
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496 #ifndef ENABLE_AHI |
| 0 | 497 /* Start the audio thread if necessary */ |
| 498 switch (audio->opened) { | |
| 499 case 1: | |
| 500 /* Start the audio thread */ | |
| 501 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); | |
| 502 if ( audio->thread == NULL ) { | |
| 503 SDL_CloseAudio(); | |
| 504 SDL_SetError("Couldn't create audio thread"); | |
| 505 return(-1); | |
| 506 } | |
| 507 break; | |
| 508 | |
| 509 default: | |
| 510 /* The audio is now playing */ | |
| 511 break; | |
| 512 } | |
|
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513 #else |
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514 SDL_mutexV(audio->mixer_lock); |
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515 D(bug("SDL_OpenAudio USCITA...\n")); |
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516 |
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517 #endif |
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518 |
| 0 | 519 return(0); |
| 520 } | |
| 521 | |
| 522 SDL_audiostatus SDL_GetAudioStatus(void) | |
| 523 { | |
| 524 SDL_AudioDevice *audio = current_audio; | |
| 525 SDL_audiostatus status; | |
| 526 | |
| 527 status = SDL_AUDIO_STOPPED; | |
| 528 if ( audio && audio->enabled ) { | |
| 529 if ( audio->paused ) { | |
| 530 status = SDL_AUDIO_PAUSED; | |
| 531 } else { | |
| 532 status = SDL_AUDIO_PLAYING; | |
| 533 } | |
| 534 } | |
| 535 return(status); | |
| 536 } | |
| 537 | |
| 538 void SDL_PauseAudio (int pause_on) | |
| 539 { | |
| 540 SDL_AudioDevice *audio = current_audio; | |
| 541 | |
| 542 if ( audio ) { | |
| 543 audio->paused = pause_on; | |
| 544 } | |
| 545 } | |
| 546 | |
| 547 void SDL_LockAudio (void) | |
| 548 { | |
| 549 SDL_AudioDevice *audio = current_audio; | |
| 550 | |
| 551 /* Obtain a lock on the mixing buffers */ | |
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552 if ( audio && audio->LockAudio ) { |
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553 audio->LockAudio(audio); |
| 0 | 554 } |
| 555 } | |
| 556 | |
| 557 void SDL_UnlockAudio (void) | |
| 558 { | |
| 559 SDL_AudioDevice *audio = current_audio; | |
| 560 | |
| 561 /* Release lock on the mixing buffers */ | |
|
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562 if ( audio && audio->UnlockAudio ) { |
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563 audio->UnlockAudio(audio); |
| 0 | 564 } |
| 565 } | |
| 566 | |
| 567 void SDL_CloseAudio (void) | |
| 568 { | |
| 569 SDL_QuitSubSystem(SDL_INIT_AUDIO); | |
| 570 } | |
| 571 | |
| 572 void SDL_AudioQuit(void) | |
| 573 { | |
| 574 SDL_AudioDevice *audio = current_audio; | |
| 575 | |
| 576 if ( audio ) { | |
| 577 audio->enabled = 0; | |
| 578 if ( audio->thread != NULL ) { | |
| 579 SDL_WaitThread(audio->thread, NULL); | |
| 580 } | |
| 581 if ( audio->mixer_lock != NULL ) { | |
| 582 SDL_DestroyMutex(audio->mixer_lock); | |
| 583 } | |
| 584 if ( audio->fake_stream != NULL ) { | |
| 585 SDL_FreeAudioMem(audio->fake_stream); | |
| 586 } | |
| 587 if ( audio->convert.needed ) { | |
| 588 SDL_FreeAudioMem(audio->convert.buf); | |
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589 |
| 0 | 590 } |
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591 #ifndef ENABLE_AHI |
| 0 | 592 if ( audio->opened ) { |
| 593 audio->CloseAudio(audio); | |
| 594 audio->opened = 0; | |
| 595 } | |
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596 #endif |
| 0 | 597 /* Free the driver data */ |
| 598 audio->free(audio); | |
| 599 current_audio = NULL; | |
| 600 } | |
| 601 } | |
| 602 | |
| 603 #define NUM_FORMATS 6 | |
| 604 static int format_idx; | |
| 605 static int format_idx_sub; | |
| 606 static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { | |
| 607 { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 608 { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 609 { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 610 { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 611 { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 612 { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 613 }; | |
| 614 | |
| 615 Uint16 SDL_FirstAudioFormat(Uint16 format) | |
| 616 { | |
| 617 for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { | |
| 618 if ( format_list[format_idx][0] == format ) { | |
| 619 break; | |
| 620 } | |
| 621 } | |
| 622 format_idx_sub = 0; | |
| 623 return(SDL_NextAudioFormat()); | |
| 624 } | |
| 625 | |
| 626 Uint16 SDL_NextAudioFormat(void) | |
| 627 { | |
| 628 if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { | |
| 629 return(0); | |
| 630 } | |
| 631 return(format_list[format_idx][format_idx_sub++]); | |
| 632 } | |
| 633 | |
| 634 void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) | |
| 635 { | |
| 636 switch (spec->format) { | |
| 637 case AUDIO_U8: | |
| 638 spec->silence = 0x80; | |
| 639 break; | |
| 640 default: | |
| 641 spec->silence = 0x00; | |
| 642 break; | |
| 643 } | |
| 644 spec->size = (spec->format&0xFF)/8; | |
| 645 spec->size *= spec->channels; | |
| 646 spec->size *= spec->samples; | |
| 647 } |