Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 610:95433459fbd2
Date: Mon, 14 Apr 2003 22:08:27 +0100
From: Patrice Mandin
Subject: [SDL][PATCH] 2 patches for sdl
Here are 2 patches for SDL:
- One is to put the dummy video drivers at the end of the
video drivers list. It gave me problems, when
SDL_VIDEODRIVER is not set, and the dummy driver is used
instead of the platform's driver, just because it is
always available. So the dummy driver must always be at
the end of the list. I suppose picogui and dc video
drivers also don't work.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 15 Apr 2003 15:46:56 +0000 |
| parents | dad72daf44b3 |
| children | 550bccdf04bd |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
297
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Updated copyright information for 2002
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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 SUNAUDIO_SUPPORT |
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54 &SUNAUDIO_bootstrap, |
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55 #endif |
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56 #ifdef DMEDIA_SUPPORT |
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57 &DMEDIA_bootstrap, |
|
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58 #endif |
| 0 | 59 #ifdef ARTSC_SUPPORT |
| 60 &ARTSC_bootstrap, | |
| 61 #endif | |
| 62 #ifdef ESD_SUPPORT | |
| 63 &ESD_bootstrap, | |
| 64 #endif | |
| 65 #ifdef NAS_SUPPORT | |
| 66 &NAS_bootstrap, | |
| 67 #endif | |
| 68 #ifdef ENABLE_DIRECTX | |
| 69 &DSOUND_bootstrap, | |
| 70 #endif | |
| 71 #ifdef ENABLE_WINDIB | |
| 72 &WAVEOUT_bootstrap, | |
| 73 #endif | |
| 74 #ifdef __BEOS__ | |
| 75 &BAUDIO_bootstrap, | |
| 76 #endif | |
| 77 #if defined(macintosh) || TARGET_API_MAC_CARBON | |
| 78 &SNDMGR_bootstrap, | |
| 79 #endif | |
| 80 #ifdef _AIX | |
| 81 &Paud_bootstrap, | |
| 82 #endif | |
|
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83 #ifdef ENABLE_AHI |
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84 &AHI_bootstrap, |
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85 #endif |
|
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86 #ifdef MINTAUDIO_SUPPORT |
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87 &MINTAUDIO_bootstrap, |
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88 #endif |
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89 #ifdef DISKAUD_SUPPORT |
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90 &DISKAUD_bootstrap, |
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91 #endif |
|
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92 #ifdef ENABLE_DC |
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93 &DCAUD_bootstrap, |
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94 #endif |
| 0 | 95 NULL |
| 96 }; | |
| 97 SDL_AudioDevice *current_audio = NULL; | |
| 98 | |
| 99 /* Various local functions */ | |
| 100 int SDL_AudioInit(const char *driver_name); | |
| 101 void SDL_AudioQuit(void); | |
| 102 | |
|
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103 #ifdef ENABLE_AHI |
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104 static int audio_configured = 0; |
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105 #endif |
| 0 | 106 |
| 107 /* The general mixing thread function */ | |
| 108 int SDL_RunAudio(void *audiop) | |
| 109 { | |
| 110 SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; | |
| 111 Uint8 *stream; | |
| 112 int stream_len; | |
| 113 void *udata; | |
| 114 void (*fill)(void *userdata,Uint8 *stream, int len); | |
| 115 int silence; | |
|
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116 #ifdef ENABLE_AHI |
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117 int started = 0; |
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118 |
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119 /* AmigaOS NEEDS that the audio driver is opened in the thread that uses it! */ |
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120 |
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121 D(bug("Task audio started audio struct:<%lx>...\n",audiop)); |
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122 |
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123 D(bug("Before Openaudio...")); |
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124 if(audio->OpenAudio(audio, &audio->spec)==-1) |
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125 { |
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126 D(bug("Open audio failed...\n")); |
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127 return(-1); |
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128 } |
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129 D(bug("OpenAudio...OK\n")); |
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130 #endif |
| 0 | 131 |
| 132 /* Perform any thread setup */ | |
| 133 if ( audio->ThreadInit ) { | |
| 134 audio->ThreadInit(audio); | |
| 135 } | |
| 136 audio->threadid = SDL_ThreadID(); | |
| 137 | |
| 138 /* Set up the mixing function */ | |
| 139 fill = audio->spec.callback; | |
| 140 udata = audio->spec.userdata; | |
|
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141 |
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142 #ifdef ENABLE_AHI |
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143 audio_configured = 1; |
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144 |
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145 D(bug("Audio configured... Checking for conversion\n")); |
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146 SDL_mutexP(audio->mixer_lock); |
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147 D(bug("Semaphore obtained...\n")); |
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148 #endif |
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149 |
| 0 | 150 if ( audio->convert.needed ) { |
| 151 if ( audio->convert.src_format == AUDIO_U8 ) { | |
| 152 silence = 0x80; | |
| 153 } else { | |
| 154 silence = 0; | |
| 155 } | |
| 156 stream_len = audio->convert.len; | |
| 157 } else { | |
| 158 silence = audio->spec.silence; | |
| 159 stream_len = audio->spec.size; | |
| 160 } | |
| 161 stream = audio->fake_stream; | |
| 162 | |
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163 #ifdef ENABLE_AHI |
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164 SDL_mutexV(audio->mixer_lock); |
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165 D(bug("Entering audio loop...\n")); |
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166 #endif |
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167 |
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168 |
| 0 | 169 /* Loop, filling the audio buffers */ |
| 170 while ( audio->enabled ) { | |
| 171 | |
| 172 /* Wait for new current buffer to finish playing */ | |
| 173 if ( stream == audio->fake_stream ) { | |
| 174 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); | |
| 175 } else { | |
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176 #ifdef ENABLE_AHI |
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177 if ( started > 1 ) |
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178 #endif |
| 0 | 179 audio->WaitAudio(audio); |
| 180 } | |
| 181 | |
| 182 /* Fill the current buffer with sound */ | |
| 183 if ( audio->convert.needed ) { | |
| 184 if ( audio->convert.buf ) { | |
| 185 stream = audio->convert.buf; | |
| 186 } else { | |
| 187 continue; | |
| 188 } | |
| 189 } else { | |
| 190 stream = audio->GetAudioBuf(audio); | |
| 191 if ( stream == NULL ) { | |
| 192 stream = audio->fake_stream; | |
| 193 } | |
| 194 } | |
| 195 memset(stream, silence, stream_len); | |
| 196 | |
| 197 if ( ! audio->paused ) { | |
| 198 SDL_mutexP(audio->mixer_lock); | |
| 199 (*fill)(udata, stream, stream_len); | |
| 200 SDL_mutexV(audio->mixer_lock); | |
| 201 } | |
| 202 | |
| 203 /* Convert the audio if necessary */ | |
| 204 if ( audio->convert.needed ) { | |
| 205 SDL_ConvertAudio(&audio->convert); | |
| 206 stream = audio->GetAudioBuf(audio); | |
| 207 if ( stream == NULL ) { | |
| 208 stream = audio->fake_stream; | |
| 209 } | |
| 210 memcpy(stream, audio->convert.buf, | |
| 211 audio->convert.len_cvt); | |
| 212 } | |
| 213 | |
| 214 /* Ready current buffer for play and change current buffer */ | |
| 215 if ( stream != audio->fake_stream ) { | |
| 216 audio->PlayAudio(audio); | |
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217 #ifdef ENABLE_AHI |
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218 /* AmigaOS don't have to wait the first time audio is played! */ |
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219 started++; |
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220 #endif |
| 0 | 221 } |
| 222 } | |
| 223 /* Wait for the audio to drain.. */ | |
| 224 if ( audio->WaitDone ) { | |
| 225 audio->WaitDone(audio); | |
| 226 } | |
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227 |
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228 #ifdef ENABLE_AHI |
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229 D(bug("WaitAudio...Done\n")); |
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230 |
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231 audio->CloseAudio(audio); |
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232 |
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233 D(bug("CloseAudio..Done, subtask exiting...\n")); |
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234 audio_configured = 0; |
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235 #endif |
| 0 | 236 return(0); |
| 237 } | |
| 238 | |
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239 static void SDL_LockAudio_Default(SDL_AudioDevice *audio) |
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240 { |
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241 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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242 return; |
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243 } |
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244 SDL_mutexP(audio->mixer_lock); |
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245 } |
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246 |
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247 static void SDL_UnlockAudio_Default(SDL_AudioDevice *audio) |
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248 { |
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249 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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250 return; |
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251 } |
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252 SDL_mutexV(audio->mixer_lock); |
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253 } |
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254 |
| 0 | 255 int SDL_AudioInit(const char *driver_name) |
| 256 { | |
| 257 SDL_AudioDevice *audio; | |
| 258 int i = 0, idx; | |
| 259 | |
| 260 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 261 if ( current_audio != NULL ) { | |
| 262 SDL_AudioQuit(); | |
| 263 } | |
| 264 | |
| 265 /* Select the proper audio driver */ | |
| 266 audio = NULL; | |
| 267 idx = 0; | |
| 268 #ifdef unix | |
| 269 if ( (driver_name == NULL) && (getenv("ESPEAKER") != NULL) ) { | |
| 270 /* Ahem, we know that if ESPEAKER is set, user probably wants | |
| 271 to use ESD, but don't start it if it's not already running. | |
| 272 This probably isn't the place to do this, but... Shh! :) | |
| 273 */ | |
| 274 for ( i=0; bootstrap[i]; ++i ) { | |
| 275 if ( strcmp(bootstrap[i]->name, "esd") == 0 ) { | |
| 276 const char *esd_no_spawn; | |
| 277 | |
| 278 /* Don't start ESD if it's not running */ | |
| 279 esd_no_spawn = getenv("ESD_NO_SPAWN"); | |
| 280 if ( esd_no_spawn == NULL ) { | |
| 281 putenv("ESD_NO_SPAWN=1"); | |
| 282 } | |
| 283 if ( bootstrap[i]->available() ) { | |
| 284 audio = bootstrap[i]->create(0); | |
| 285 break; | |
| 286 } | |
| 287 #ifdef linux /* No unsetenv() on most platforms */ | |
| 288 if ( esd_no_spawn == NULL ) { | |
| 289 unsetenv("ESD_NO_SPAWN"); | |
| 290 } | |
| 291 #endif | |
| 292 } | |
| 293 } | |
| 294 } | |
| 295 #endif /* unix */ | |
| 296 if ( audio == NULL ) { | |
| 297 if ( driver_name != NULL ) { | |
| 298 #if 0 /* This will be replaced with a better driver selection API */ | |
| 299 if ( strrchr(driver_name, ':') != NULL ) { | |
| 300 idx = atoi(strrchr(driver_name, ':')+1); | |
| 301 } | |
| 302 #endif | |
| 303 for ( i=0; bootstrap[i]; ++i ) { | |
| 304 if (strncmp(bootstrap[i]->name, driver_name, | |
| 305 strlen(bootstrap[i]->name)) == 0) { | |
| 306 if ( bootstrap[i]->available() ) { | |
| 307 audio=bootstrap[i]->create(idx); | |
| 308 break; | |
| 309 } | |
| 310 } | |
| 311 } | |
| 312 } else { | |
| 313 for ( i=0; bootstrap[i]; ++i ) { | |
| 314 if ( bootstrap[i]->available() ) { | |
| 315 audio = bootstrap[i]->create(idx); | |
| 316 if ( audio != NULL ) { | |
| 317 break; | |
| 318 } | |
| 319 } | |
| 320 } | |
| 321 } | |
| 322 if ( audio == NULL ) { | |
| 323 SDL_SetError("No available audio device"); | |
| 324 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 325 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 326 */ | |
| 327 return(-1); | |
| 328 #endif | |
| 329 } | |
| 330 } | |
| 331 current_audio = audio; | |
| 332 if ( current_audio ) { | |
| 333 current_audio->name = bootstrap[i]->name; | |
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334 if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
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335 current_audio->LockAudio = SDL_LockAudio_Default; |
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336 current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
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337 } |
| 0 | 338 } |
| 339 return(0); | |
| 340 } | |
| 341 | |
| 342 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 343 { | |
| 344 if ( current_audio != NULL ) { | |
| 345 strncpy(namebuf, current_audio->name, maxlen-1); | |
| 346 namebuf[maxlen-1] = '\0'; | |
| 347 return(namebuf); | |
| 348 } | |
| 349 return(NULL); | |
| 350 } | |
| 351 | |
| 352 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 353 { | |
| 354 SDL_AudioDevice *audio; | |
| 355 | |
| 356 /* Start up the audio driver, if necessary */ | |
| 357 if ( ! current_audio ) { | |
| 358 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 359 (current_audio == NULL) ) { | |
| 360 return(-1); | |
| 361 } | |
| 362 } | |
| 363 audio = current_audio; | |
| 364 | |
|
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365 if (audio->opened) { |
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366 SDL_SetError("Audio device is already opened"); |
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367 return(-1); |
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368 } |
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369 |
| 0 | 370 /* Verify some parameters */ |
| 371 if ( desired->callback == NULL ) { | |
| 372 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 373 return(-1); | |
| 374 } | |
| 375 switch ( desired->channels ) { | |
| 376 case 1: /* Mono */ | |
| 377 case 2: /* Stereo */ | |
| 378 break; | |
| 379 default: | |
| 380 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 381 return(-1); | |
| 382 } | |
| 383 | |
| 384 #ifdef macintosh | |
| 385 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ | |
| 386 #else | |
|
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387 #if defined(__MINT__) && !defined(ENABLE_THREADS) |
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388 /* Uses interrupt driven audio, without thread */ |
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389 #else |
| 0 | 390 /* Create a semaphore for locking the sound buffers */ |
| 391 audio->mixer_lock = SDL_CreateMutex(); | |
| 392 if ( audio->mixer_lock == NULL ) { | |
| 393 SDL_SetError("Couldn't create mixer lock"); | |
| 394 SDL_CloseAudio(); | |
| 395 return(-1); | |
| 396 } | |
|
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397 #endif /* __MINT__ */ |
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398 #endif /* macintosh */ |
| 0 | 399 |
| 400 /* Calculate the silence and size of the audio specification */ | |
| 401 SDL_CalculateAudioSpec(desired); | |
| 402 | |
| 403 /* Open the audio subsystem */ | |
| 404 memcpy(&audio->spec, desired, sizeof(audio->spec)); | |
| 405 audio->convert.needed = 0; | |
| 406 audio->enabled = 1; | |
| 407 audio->paused = 1; | |
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408 |
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409 #ifndef ENABLE_AHI |
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410 |
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411 /* AmigaOS opens audio inside the main loop */ |
| 0 | 412 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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413 |
| 0 | 414 if ( ! audio->opened ) { |
| 415 SDL_CloseAudio(); | |
| 416 return(-1); | |
| 417 } | |
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418 #else |
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419 D(bug("Locking semaphore...")); |
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420 SDL_mutexP(audio->mixer_lock); |
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421 |
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422 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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423 D(bug("Created thread...\n")); |
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424 |
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425 if ( audio->thread == NULL ) { |
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426 SDL_mutexV(audio->mixer_lock); |
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427 SDL_CloseAudio(); |
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428 SDL_SetError("Couldn't create audio thread"); |
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429 return(-1); |
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430 } |
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431 |
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432 while(!audio_configured) |
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433 SDL_Delay(100); |
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434 #endif |
| 0 | 435 |
| 436 /* If the audio driver changes the buffer size, accept it */ | |
| 437 if ( audio->spec.samples != desired->samples ) { | |
| 438 desired->samples = audio->spec.samples; | |
| 439 SDL_CalculateAudioSpec(desired); | |
| 440 } | |
| 441 | |
| 442 /* Allocate a fake audio memory buffer */ | |
| 443 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 444 if ( audio->fake_stream == NULL ) { | |
| 445 SDL_CloseAudio(); | |
| 446 SDL_OutOfMemory(); | |
| 447 return(-1); | |
| 448 } | |
| 449 | |
| 450 /* See if we need to do any conversion */ | |
| 451 if ( memcmp(desired, &audio->spec, sizeof(audio->spec)) == 0 ) { | |
| 452 /* Just copy over the desired audio specification */ | |
| 453 if ( obtained != NULL ) { | |
| 454 memcpy(obtained, &audio->spec, sizeof(audio->spec)); | |
| 455 } | |
| 456 } else { | |
| 457 /* Copy over the audio specification if possible */ | |
| 458 if ( obtained != NULL ) { | |
| 459 memcpy(obtained, &audio->spec, sizeof(audio->spec)); | |
| 460 } else { | |
| 461 /* Build an audio conversion block */ | |
| 462 if ( SDL_BuildAudioCVT(&audio->convert, | |
| 463 desired->format, desired->channels, | |
| 464 desired->freq, | |
| 465 audio->spec.format, audio->spec.channels, | |
| 466 audio->spec.freq) < 0 ) { | |
| 467 SDL_CloseAudio(); | |
| 468 return(-1); | |
| 469 } | |
| 470 if ( audio->convert.needed ) { | |
| 471 audio->convert.len = desired->size; | |
| 472 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( | |
| 473 audio->convert.len*audio->convert.len_mult); | |
| 474 if ( audio->convert.buf == NULL ) { | |
| 475 SDL_CloseAudio(); | |
| 476 SDL_OutOfMemory(); | |
| 477 return(-1); | |
| 478 } | |
| 479 } | |
| 480 } | |
| 481 } | |
| 482 | |
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483 #ifndef ENABLE_AHI |
| 0 | 484 /* Start the audio thread if necessary */ |
| 485 switch (audio->opened) { | |
| 486 case 1: | |
| 487 /* Start the audio thread */ | |
| 488 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); | |
| 489 if ( audio->thread == NULL ) { | |
| 490 SDL_CloseAudio(); | |
| 491 SDL_SetError("Couldn't create audio thread"); | |
| 492 return(-1); | |
| 493 } | |
| 494 break; | |
| 495 | |
| 496 default: | |
| 497 /* The audio is now playing */ | |
| 498 break; | |
| 499 } | |
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500 #else |
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501 SDL_mutexV(audio->mixer_lock); |
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502 D(bug("SDL_OpenAudio USCITA...\n")); |
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503 |
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504 #endif |
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505 |
| 0 | 506 return(0); |
| 507 } | |
| 508 | |
| 509 SDL_audiostatus SDL_GetAudioStatus(void) | |
| 510 { | |
| 511 SDL_AudioDevice *audio = current_audio; | |
| 512 SDL_audiostatus status; | |
| 513 | |
| 514 status = SDL_AUDIO_STOPPED; | |
| 515 if ( audio && audio->enabled ) { | |
| 516 if ( audio->paused ) { | |
| 517 status = SDL_AUDIO_PAUSED; | |
| 518 } else { | |
| 519 status = SDL_AUDIO_PLAYING; | |
| 520 } | |
| 521 } | |
| 522 return(status); | |
| 523 } | |
| 524 | |
| 525 void SDL_PauseAudio (int pause_on) | |
| 526 { | |
| 527 SDL_AudioDevice *audio = current_audio; | |
| 528 | |
| 529 if ( audio ) { | |
| 530 audio->paused = pause_on; | |
| 531 } | |
| 532 } | |
| 533 | |
| 534 void SDL_LockAudio (void) | |
| 535 { | |
| 536 SDL_AudioDevice *audio = current_audio; | |
| 537 | |
| 538 /* Obtain a lock on the mixing buffers */ | |
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539 if ( audio && audio->LockAudio ) { |
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540 audio->LockAudio(audio); |
| 0 | 541 } |
| 542 } | |
| 543 | |
| 544 void SDL_UnlockAudio (void) | |
| 545 { | |
| 546 SDL_AudioDevice *audio = current_audio; | |
| 547 | |
| 548 /* Release lock on the mixing buffers */ | |
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549 if ( audio && audio->UnlockAudio ) { |
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550 audio->UnlockAudio(audio); |
| 0 | 551 } |
| 552 } | |
| 553 | |
| 554 void SDL_CloseAudio (void) | |
| 555 { | |
| 556 SDL_QuitSubSystem(SDL_INIT_AUDIO); | |
| 557 } | |
| 558 | |
| 559 void SDL_AudioQuit(void) | |
| 560 { | |
| 561 SDL_AudioDevice *audio = current_audio; | |
| 562 | |
| 563 if ( audio ) { | |
| 564 audio->enabled = 0; | |
| 565 if ( audio->thread != NULL ) { | |
| 566 SDL_WaitThread(audio->thread, NULL); | |
| 567 } | |
| 568 if ( audio->mixer_lock != NULL ) { | |
| 569 SDL_DestroyMutex(audio->mixer_lock); | |
| 570 } | |
| 571 if ( audio->fake_stream != NULL ) { | |
| 572 SDL_FreeAudioMem(audio->fake_stream); | |
| 573 } | |
| 574 if ( audio->convert.needed ) { | |
| 575 SDL_FreeAudioMem(audio->convert.buf); | |
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576 |
| 0 | 577 } |
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578 #ifndef ENABLE_AHI |
| 0 | 579 if ( audio->opened ) { |
| 580 audio->CloseAudio(audio); | |
| 581 audio->opened = 0; | |
| 582 } | |
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583 #endif |
| 0 | 584 /* Free the driver data */ |
| 585 audio->free(audio); | |
| 586 current_audio = NULL; | |
| 587 } | |
| 588 } | |
| 589 | |
| 590 #define NUM_FORMATS 6 | |
| 591 static int format_idx; | |
| 592 static int format_idx_sub; | |
| 593 static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { | |
| 594 { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 595 { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 596 { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 597 { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 598 { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 599 { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 600 }; | |
| 601 | |
| 602 Uint16 SDL_FirstAudioFormat(Uint16 format) | |
| 603 { | |
| 604 for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { | |
| 605 if ( format_list[format_idx][0] == format ) { | |
| 606 break; | |
| 607 } | |
| 608 } | |
| 609 format_idx_sub = 0; | |
| 610 return(SDL_NextAudioFormat()); | |
| 611 } | |
| 612 | |
| 613 Uint16 SDL_NextAudioFormat(void) | |
| 614 { | |
| 615 if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { | |
| 616 return(0); | |
| 617 } | |
| 618 return(format_list[format_idx][format_idx_sub++]); | |
| 619 } | |
| 620 | |
| 621 void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) | |
| 622 { | |
| 623 switch (spec->format) { | |
| 624 case AUDIO_U8: | |
| 625 spec->silence = 0x80; | |
| 626 break; | |
| 627 default: | |
| 628 spec->silence = 0x00; | |
| 629 break; | |
| 630 } | |
| 631 spec->size = (spec->format&0xFF)/8; | |
| 632 spec->size *= spec->channels; | |
| 633 spec->size *= spec->samples; | |
| 634 } |