Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 654:e92bcf2573cb
Added audio and CD-ROM support for OSF/Tru64 (thanks Hayashi!)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 22 Jul 2003 14:01:21 +0000 |
| parents | 594422ab8f9f |
| children | 8bedd6d61642 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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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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35
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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 MMEAUDIO_SUPPORT |
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87 &MMEAUDIO_bootstrap, |
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88 #endif |
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89 #ifdef MINTAUDIO_SUPPORT |
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90 &MINTAUDIO_GSXB_bootstrap, |
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91 &MINTAUDIO_MCSN_bootstrap, |
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92 &MINTAUDIO_STFA_bootstrap, |
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93 &MINTAUDIO_XBIOS_bootstrap, |
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94 &MINTAUDIO_DMA8_bootstrap, |
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95 #endif |
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96 #ifdef DISKAUD_SUPPORT |
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97 &DISKAUD_bootstrap, |
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98 #endif |
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99 #ifdef ENABLE_DC |
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100 &DCAUD_bootstrap, |
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101 #endif |
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102 #ifdef DRENDERER_SUPPORT |
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103 &DRENDERER_bootstrap, |
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104 #endif |
| 0 | 105 NULL |
| 106 }; | |
| 107 SDL_AudioDevice *current_audio = NULL; | |
| 108 | |
| 109 /* Various local functions */ | |
| 110 int SDL_AudioInit(const char *driver_name); | |
| 111 void SDL_AudioQuit(void); | |
| 112 | |
|
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113 #ifdef ENABLE_AHI |
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114 static int audio_configured = 0; |
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115 #endif |
| 0 | 116 |
| 117 /* The general mixing thread function */ | |
| 118 int SDL_RunAudio(void *audiop) | |
| 119 { | |
| 120 SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; | |
| 121 Uint8 *stream; | |
| 122 int stream_len; | |
| 123 void *udata; | |
| 124 void (*fill)(void *userdata,Uint8 *stream, int len); | |
| 125 int silence; | |
|
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126 #ifdef ENABLE_AHI |
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127 int started = 0; |
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128 |
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129 /* AmigaOS NEEDS that the audio driver is opened in the thread that uses it! */ |
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130 |
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131 D(bug("Task audio started audio struct:<%lx>...\n",audiop)); |
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132 |
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133 D(bug("Before Openaudio...")); |
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134 if(audio->OpenAudio(audio, &audio->spec)==-1) |
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135 { |
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136 D(bug("Open audio failed...\n")); |
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137 return(-1); |
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138 } |
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139 D(bug("OpenAudio...OK\n")); |
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140 #endif |
| 0 | 141 |
| 142 /* Perform any thread setup */ | |
| 143 if ( audio->ThreadInit ) { | |
| 144 audio->ThreadInit(audio); | |
| 145 } | |
| 146 audio->threadid = SDL_ThreadID(); | |
| 147 | |
| 148 /* Set up the mixing function */ | |
| 149 fill = audio->spec.callback; | |
| 150 udata = audio->spec.userdata; | |
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151 |
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152 #ifdef ENABLE_AHI |
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153 audio_configured = 1; |
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154 |
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155 D(bug("Audio configured... Checking for conversion\n")); |
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156 SDL_mutexP(audio->mixer_lock); |
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157 D(bug("Semaphore obtained...\n")); |
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158 #endif |
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159 |
| 0 | 160 if ( audio->convert.needed ) { |
| 161 if ( audio->convert.src_format == AUDIO_U8 ) { | |
| 162 silence = 0x80; | |
| 163 } else { | |
| 164 silence = 0; | |
| 165 } | |
| 166 stream_len = audio->convert.len; | |
| 167 } else { | |
| 168 silence = audio->spec.silence; | |
| 169 stream_len = audio->spec.size; | |
| 170 } | |
| 171 stream = audio->fake_stream; | |
| 172 | |
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173 #ifdef ENABLE_AHI |
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174 SDL_mutexV(audio->mixer_lock); |
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175 D(bug("Entering audio loop...\n")); |
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176 #endif |
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177 |
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178 |
| 0 | 179 /* Loop, filling the audio buffers */ |
| 180 while ( audio->enabled ) { | |
| 181 | |
| 182 /* Wait for new current buffer to finish playing */ | |
| 183 if ( stream == audio->fake_stream ) { | |
| 184 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); | |
| 185 } else { | |
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186 #ifdef ENABLE_AHI |
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187 if ( started > 1 ) |
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188 #endif |
| 0 | 189 audio->WaitAudio(audio); |
| 190 } | |
| 191 | |
| 192 /* Fill the current buffer with sound */ | |
| 193 if ( audio->convert.needed ) { | |
| 194 if ( audio->convert.buf ) { | |
| 195 stream = audio->convert.buf; | |
| 196 } else { | |
| 197 continue; | |
| 198 } | |
| 199 } else { | |
| 200 stream = audio->GetAudioBuf(audio); | |
| 201 if ( stream == NULL ) { | |
| 202 stream = audio->fake_stream; | |
| 203 } | |
| 204 } | |
| 205 memset(stream, silence, stream_len); | |
| 206 | |
| 207 if ( ! audio->paused ) { | |
| 208 SDL_mutexP(audio->mixer_lock); | |
| 209 (*fill)(udata, stream, stream_len); | |
| 210 SDL_mutexV(audio->mixer_lock); | |
| 211 } | |
| 212 | |
| 213 /* Convert the audio if necessary */ | |
| 214 if ( audio->convert.needed ) { | |
| 215 SDL_ConvertAudio(&audio->convert); | |
| 216 stream = audio->GetAudioBuf(audio); | |
| 217 if ( stream == NULL ) { | |
| 218 stream = audio->fake_stream; | |
| 219 } | |
| 220 memcpy(stream, audio->convert.buf, | |
| 221 audio->convert.len_cvt); | |
| 222 } | |
| 223 | |
| 224 /* Ready current buffer for play and change current buffer */ | |
| 225 if ( stream != audio->fake_stream ) { | |
| 226 audio->PlayAudio(audio); | |
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227 #ifdef ENABLE_AHI |
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228 /* AmigaOS don't have to wait the first time audio is played! */ |
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229 started++; |
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230 #endif |
| 0 | 231 } |
| 232 } | |
| 233 /* Wait for the audio to drain.. */ | |
| 234 if ( audio->WaitDone ) { | |
| 235 audio->WaitDone(audio); | |
| 236 } | |
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237 |
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238 #ifdef ENABLE_AHI |
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239 D(bug("WaitAudio...Done\n")); |
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240 |
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241 audio->CloseAudio(audio); |
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242 |
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243 D(bug("CloseAudio..Done, subtask exiting...\n")); |
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244 audio_configured = 0; |
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245 #endif |
| 0 | 246 return(0); |
| 247 } | |
| 248 | |
|
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249 static void SDL_LockAudio_Default(SDL_AudioDevice *audio) |
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250 { |
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251 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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252 return; |
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253 } |
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254 SDL_mutexP(audio->mixer_lock); |
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255 } |
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256 |
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257 static void SDL_UnlockAudio_Default(SDL_AudioDevice *audio) |
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258 { |
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259 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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260 return; |
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261 } |
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262 SDL_mutexV(audio->mixer_lock); |
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263 } |
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264 |
| 0 | 265 int SDL_AudioInit(const char *driver_name) |
| 266 { | |
| 267 SDL_AudioDevice *audio; | |
| 268 int i = 0, idx; | |
| 269 | |
| 270 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 271 if ( current_audio != NULL ) { | |
| 272 SDL_AudioQuit(); | |
| 273 } | |
| 274 | |
| 275 /* Select the proper audio driver */ | |
| 276 audio = NULL; | |
| 277 idx = 0; | |
| 278 #ifdef unix | |
| 279 if ( (driver_name == NULL) && (getenv("ESPEAKER") != NULL) ) { | |
| 280 /* Ahem, we know that if ESPEAKER is set, user probably wants | |
| 281 to use ESD, but don't start it if it's not already running. | |
| 282 This probably isn't the place to do this, but... Shh! :) | |
| 283 */ | |
| 284 for ( i=0; bootstrap[i]; ++i ) { | |
| 285 if ( strcmp(bootstrap[i]->name, "esd") == 0 ) { | |
| 286 const char *esd_no_spawn; | |
| 287 | |
| 288 /* Don't start ESD if it's not running */ | |
| 289 esd_no_spawn = getenv("ESD_NO_SPAWN"); | |
| 290 if ( esd_no_spawn == NULL ) { | |
| 291 putenv("ESD_NO_SPAWN=1"); | |
| 292 } | |
| 293 if ( bootstrap[i]->available() ) { | |
| 294 audio = bootstrap[i]->create(0); | |
| 295 break; | |
| 296 } | |
| 297 #ifdef linux /* No unsetenv() on most platforms */ | |
| 298 if ( esd_no_spawn == NULL ) { | |
| 299 unsetenv("ESD_NO_SPAWN"); | |
| 300 } | |
| 301 #endif | |
| 302 } | |
| 303 } | |
| 304 } | |
| 305 #endif /* unix */ | |
| 306 if ( audio == NULL ) { | |
| 307 if ( driver_name != NULL ) { | |
| 308 #if 0 /* This will be replaced with a better driver selection API */ | |
| 309 if ( strrchr(driver_name, ':') != NULL ) { | |
| 310 idx = atoi(strrchr(driver_name, ':')+1); | |
| 311 } | |
| 312 #endif | |
| 313 for ( i=0; bootstrap[i]; ++i ) { | |
| 314 if (strncmp(bootstrap[i]->name, driver_name, | |
| 315 strlen(bootstrap[i]->name)) == 0) { | |
| 316 if ( bootstrap[i]->available() ) { | |
| 317 audio=bootstrap[i]->create(idx); | |
| 318 break; | |
| 319 } | |
| 320 } | |
| 321 } | |
| 322 } else { | |
| 323 for ( i=0; bootstrap[i]; ++i ) { | |
| 324 if ( bootstrap[i]->available() ) { | |
| 325 audio = bootstrap[i]->create(idx); | |
| 326 if ( audio != NULL ) { | |
| 327 break; | |
| 328 } | |
| 329 } | |
| 330 } | |
| 331 } | |
| 332 if ( audio == NULL ) { | |
| 333 SDL_SetError("No available audio device"); | |
| 334 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 335 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 336 */ | |
| 337 return(-1); | |
| 338 #endif | |
| 339 } | |
| 340 } | |
| 341 current_audio = audio; | |
| 342 if ( current_audio ) { | |
| 343 current_audio->name = bootstrap[i]->name; | |
|
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344 if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
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345 current_audio->LockAudio = SDL_LockAudio_Default; |
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346 current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
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347 } |
| 0 | 348 } |
| 349 return(0); | |
| 350 } | |
| 351 | |
| 352 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 353 { | |
| 354 if ( current_audio != NULL ) { | |
| 355 strncpy(namebuf, current_audio->name, maxlen-1); | |
| 356 namebuf[maxlen-1] = '\0'; | |
| 357 return(namebuf); | |
| 358 } | |
| 359 return(NULL); | |
| 360 } | |
| 361 | |
| 362 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 363 { | |
| 364 SDL_AudioDevice *audio; | |
| 365 | |
| 366 /* Start up the audio driver, if necessary */ | |
| 367 if ( ! current_audio ) { | |
| 368 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 369 (current_audio == NULL) ) { | |
| 370 return(-1); | |
| 371 } | |
| 372 } | |
| 373 audio = current_audio; | |
| 374 | |
|
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375 if (audio->opened) { |
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376 SDL_SetError("Audio device is already opened"); |
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377 return(-1); |
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378 } |
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379 |
| 0 | 380 /* Verify some parameters */ |
| 381 if ( desired->callback == NULL ) { | |
| 382 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 383 return(-1); | |
| 384 } | |
| 385 switch ( desired->channels ) { | |
| 386 case 1: /* Mono */ | |
| 387 case 2: /* Stereo */ | |
| 388 break; | |
| 389 default: | |
| 390 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 391 return(-1); | |
| 392 } | |
| 393 | |
|
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394 #if defined(macintosh) || defined(__riscos__) |
| 0 | 395 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ |
| 396 #else | |
|
398
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397 #if defined(__MINT__) && !defined(ENABLE_THREADS) |
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398 /* Uses interrupt driven audio, without thread */ |
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399 #else |
| 0 | 400 /* Create a semaphore for locking the sound buffers */ |
| 401 audio->mixer_lock = SDL_CreateMutex(); | |
| 402 if ( audio->mixer_lock == NULL ) { | |
| 403 SDL_SetError("Couldn't create mixer lock"); | |
| 404 SDL_CloseAudio(); | |
| 405 return(-1); | |
| 406 } | |
|
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407 #endif /* __MINT__ */ |
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408 #endif /* macintosh */ |
| 0 | 409 |
| 410 /* Calculate the silence and size of the audio specification */ | |
| 411 SDL_CalculateAudioSpec(desired); | |
| 412 | |
| 413 /* Open the audio subsystem */ | |
| 414 memcpy(&audio->spec, desired, sizeof(audio->spec)); | |
| 415 audio->convert.needed = 0; | |
| 416 audio->enabled = 1; | |
| 417 audio->paused = 1; | |
|
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418 |
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419 #ifndef ENABLE_AHI |
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420 |
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421 /* AmigaOS opens audio inside the main loop */ |
| 0 | 422 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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423 |
| 0 | 424 if ( ! audio->opened ) { |
| 425 SDL_CloseAudio(); | |
| 426 return(-1); | |
| 427 } | |
|
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428 #else |
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429 D(bug("Locking semaphore...")); |
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430 SDL_mutexP(audio->mixer_lock); |
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431 |
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432 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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433 D(bug("Created thread...\n")); |
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434 |
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435 if ( audio->thread == NULL ) { |
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436 SDL_mutexV(audio->mixer_lock); |
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437 SDL_CloseAudio(); |
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438 SDL_SetError("Couldn't create audio thread"); |
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439 return(-1); |
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440 } |
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441 |
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442 while(!audio_configured) |
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443 SDL_Delay(100); |
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444 #endif |
| 0 | 445 |
| 446 /* If the audio driver changes the buffer size, accept it */ | |
| 447 if ( audio->spec.samples != desired->samples ) { | |
| 448 desired->samples = audio->spec.samples; | |
| 449 SDL_CalculateAudioSpec(desired); | |
| 450 } | |
| 451 | |
| 452 /* Allocate a fake audio memory buffer */ | |
| 453 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 454 if ( audio->fake_stream == NULL ) { | |
| 455 SDL_CloseAudio(); | |
| 456 SDL_OutOfMemory(); | |
| 457 return(-1); | |
| 458 } | |
| 459 | |
| 460 /* See if we need to do any conversion */ | |
| 461 if ( memcmp(desired, &audio->spec, sizeof(audio->spec)) == 0 ) { | |
| 462 /* Just copy over the desired audio specification */ | |
| 463 if ( obtained != NULL ) { | |
| 464 memcpy(obtained, &audio->spec, sizeof(audio->spec)); | |
| 465 } | |
| 466 } else { | |
| 467 /* Copy over the audio specification if possible */ | |
| 468 if ( obtained != NULL ) { | |
| 469 memcpy(obtained, &audio->spec, sizeof(audio->spec)); | |
| 470 } else { | |
| 471 /* Build an audio conversion block */ | |
| 472 if ( SDL_BuildAudioCVT(&audio->convert, | |
| 473 desired->format, desired->channels, | |
| 474 desired->freq, | |
| 475 audio->spec.format, audio->spec.channels, | |
| 476 audio->spec.freq) < 0 ) { | |
| 477 SDL_CloseAudio(); | |
| 478 return(-1); | |
| 479 } | |
| 480 if ( audio->convert.needed ) { | |
| 481 audio->convert.len = desired->size; | |
| 482 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( | |
| 483 audio->convert.len*audio->convert.len_mult); | |
| 484 if ( audio->convert.buf == NULL ) { | |
| 485 SDL_CloseAudio(); | |
| 486 SDL_OutOfMemory(); | |
| 487 return(-1); | |
| 488 } | |
| 489 } | |
| 490 } | |
| 491 } | |
| 492 | |
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493 #ifndef ENABLE_AHI |
| 0 | 494 /* Start the audio thread if necessary */ |
| 495 switch (audio->opened) { | |
| 496 case 1: | |
| 497 /* Start the audio thread */ | |
| 498 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); | |
| 499 if ( audio->thread == NULL ) { | |
| 500 SDL_CloseAudio(); | |
| 501 SDL_SetError("Couldn't create audio thread"); | |
| 502 return(-1); | |
| 503 } | |
| 504 break; | |
| 505 | |
| 506 default: | |
| 507 /* The audio is now playing */ | |
| 508 break; | |
| 509 } | |
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510 #else |
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511 SDL_mutexV(audio->mixer_lock); |
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512 D(bug("SDL_OpenAudio USCITA...\n")); |
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513 |
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514 #endif |
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515 |
| 0 | 516 return(0); |
| 517 } | |
| 518 | |
| 519 SDL_audiostatus SDL_GetAudioStatus(void) | |
| 520 { | |
| 521 SDL_AudioDevice *audio = current_audio; | |
| 522 SDL_audiostatus status; | |
| 523 | |
| 524 status = SDL_AUDIO_STOPPED; | |
| 525 if ( audio && audio->enabled ) { | |
| 526 if ( audio->paused ) { | |
| 527 status = SDL_AUDIO_PAUSED; | |
| 528 } else { | |
| 529 status = SDL_AUDIO_PLAYING; | |
| 530 } | |
| 531 } | |
| 532 return(status); | |
| 533 } | |
| 534 | |
| 535 void SDL_PauseAudio (int pause_on) | |
| 536 { | |
| 537 SDL_AudioDevice *audio = current_audio; | |
| 538 | |
| 539 if ( audio ) { | |
| 540 audio->paused = pause_on; | |
| 541 } | |
| 542 } | |
| 543 | |
| 544 void SDL_LockAudio (void) | |
| 545 { | |
| 546 SDL_AudioDevice *audio = current_audio; | |
| 547 | |
| 548 /* Obtain a lock on the mixing buffers */ | |
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549 if ( audio && audio->LockAudio ) { |
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550 audio->LockAudio(audio); |
| 0 | 551 } |
| 552 } | |
| 553 | |
| 554 void SDL_UnlockAudio (void) | |
| 555 { | |
| 556 SDL_AudioDevice *audio = current_audio; | |
| 557 | |
| 558 /* Release lock on the mixing buffers */ | |
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559 if ( audio && audio->UnlockAudio ) { |
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560 audio->UnlockAudio(audio); |
| 0 | 561 } |
| 562 } | |
| 563 | |
| 564 void SDL_CloseAudio (void) | |
| 565 { | |
| 566 SDL_QuitSubSystem(SDL_INIT_AUDIO); | |
| 567 } | |
| 568 | |
| 569 void SDL_AudioQuit(void) | |
| 570 { | |
| 571 SDL_AudioDevice *audio = current_audio; | |
| 572 | |
| 573 if ( audio ) { | |
| 574 audio->enabled = 0; | |
| 575 if ( audio->thread != NULL ) { | |
| 576 SDL_WaitThread(audio->thread, NULL); | |
| 577 } | |
| 578 if ( audio->mixer_lock != NULL ) { | |
| 579 SDL_DestroyMutex(audio->mixer_lock); | |
| 580 } | |
| 581 if ( audio->fake_stream != NULL ) { | |
| 582 SDL_FreeAudioMem(audio->fake_stream); | |
| 583 } | |
| 584 if ( audio->convert.needed ) { | |
| 585 SDL_FreeAudioMem(audio->convert.buf); | |
|
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Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
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changeset
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586 |
| 0 | 587 } |
|
21
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
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diff
changeset
|
588 #ifndef ENABLE_AHI |
| 0 | 589 if ( audio->opened ) { |
| 590 audio->CloseAudio(audio); | |
| 591 audio->opened = 0; | |
| 592 } | |
|
21
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
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diff
changeset
|
593 #endif |
| 0 | 594 /* Free the driver data */ |
| 595 audio->free(audio); | |
| 596 current_audio = NULL; | |
| 597 } | |
| 598 } | |
| 599 | |
| 600 #define NUM_FORMATS 6 | |
| 601 static int format_idx; | |
| 602 static int format_idx_sub; | |
| 603 static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { | |
| 604 { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 605 { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 606 { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 607 { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 608 { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 609 { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 610 }; | |
| 611 | |
| 612 Uint16 SDL_FirstAudioFormat(Uint16 format) | |
| 613 { | |
| 614 for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { | |
| 615 if ( format_list[format_idx][0] == format ) { | |
| 616 break; | |
| 617 } | |
| 618 } | |
| 619 format_idx_sub = 0; | |
| 620 return(SDL_NextAudioFormat()); | |
| 621 } | |
| 622 | |
| 623 Uint16 SDL_NextAudioFormat(void) | |
| 624 { | |
| 625 if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { | |
| 626 return(0); | |
| 627 } | |
| 628 return(format_list[format_idx][format_idx_sub++]); | |
| 629 } | |
| 630 | |
| 631 void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) | |
| 632 { | |
| 633 switch (spec->format) { | |
| 634 case AUDIO_U8: | |
| 635 spec->silence = 0x80; | |
| 636 break; | |
| 637 default: | |
| 638 spec->silence = 0x00; | |
| 639 break; | |
| 640 } | |
| 641 spec->size = (spec->format&0xFF)/8; | |
| 642 spec->size *= spec->channels; | |
| 643 spec->size *= spec->samples; | |
| 644 } |