Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 1406:39ca9a4b22f3
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 21 Feb 2006 09:14:58 +0000 |
| parents | d910939febfa |
| children | ceb5c2fec4f1 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 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 | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
|
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* Allow access to a raw mixing buffer */ | |
| 25 | |
| 26 #include "SDL.h" | |
| 27 #include "SDL_audio_c.h" | |
| 28 #include "SDL_audiomem.h" | |
| 29 #include "SDL_sysaudio.h" | |
| 30 | |
| 1190 | 31 #ifdef __OS2__ |
| 32 // We'll need the DosSetPriority() API! | |
| 33 #define INCL_DOSPROCESS | |
| 34 #include <os2.h> | |
| 35 #endif | |
| 36 | |
| 0 | 37 /* Available audio drivers */ |
| 38 static AudioBootStrap *bootstrap[] = { | |
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39 #if SDL_AUDIO_DRIVER_OPENBSD |
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40 &OPENBSD_AUDIO_bootstrap, |
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41 #endif |
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42 #if SDL_AUDIO_DRIVER_OSS |
| 0 | 43 &DSP_bootstrap, |
| 44 &DMA_bootstrap, | |
| 45 #endif | |
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46 #if SDL_AUDIO_DRIVER_ALSA |
| 0 | 47 &ALSA_bootstrap, |
| 48 #endif | |
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49 #if SDL_AUDIO_DRIVER_QNXNTO |
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50 &QNXNTOAUDIO_bootstrap, |
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51 #endif |
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52 #if SDL_AUDIO_DRIVER_SUNAUDIO |
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53 &SUNAUDIO_bootstrap, |
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54 #endif |
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55 #if SDL_AUDIO_DRIVER_DMEDIA |
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56 &DMEDIA_bootstrap, |
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57 #endif |
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58 #if SDL_AUDIO_DRIVER_ARTS |
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59 &ARTS_bootstrap, |
| 0 | 60 #endif |
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61 #if SDL_AUDIO_DRIVER_ESD |
| 0 | 62 &ESD_bootstrap, |
| 63 #endif | |
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64 #if SDL_AUDIO_DRIVER_NAS |
| 0 | 65 &NAS_bootstrap, |
| 66 #endif | |
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67 #if SDL_AUDIO_DRIVER_DSOUND |
| 0 | 68 &DSOUND_bootstrap, |
| 69 #endif | |
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70 #if SDL_AUDIO_DRIVER_WAVEOUT |
| 0 | 71 &WAVEOUT_bootstrap, |
| 72 #endif | |
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73 #if SDL_AUDIO_DRIVER_PAUD |
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74 &Paud_bootstrap, |
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75 #endif |
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76 #if SDL_AUDIO_DRIVER_BAUDIO |
| 0 | 77 &BAUDIO_bootstrap, |
| 78 #endif | |
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79 #if SDL_AUDIO_DRIVER_COREAUDIO |
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80 &COREAUDIO_bootstrap, |
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81 #endif |
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82 #if SDL_AUDIO_DRIVER_SNDMGR |
| 0 | 83 &SNDMGR_bootstrap, |
| 84 #endif | |
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85 #if SDL_AUDIO_DRIVER_AHI |
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86 &AHI_bootstrap, |
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87 #endif |
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88 #if SDL_AUDIO_DRIVER_MINT |
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89 &MINTAUDIO_GSXB_bootstrap, |
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90 &MINTAUDIO_MCSN_bootstrap, |
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91 &MINTAUDIO_STFA_bootstrap, |
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92 &MINTAUDIO_XBIOS_bootstrap, |
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93 &MINTAUDIO_DMA8_bootstrap, |
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94 #endif |
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95 #if SDL_AUDIO_DRIVER_DISK |
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96 &DISKAUD_bootstrap, |
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97 #endif |
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98 #if SDL_AUDIO_DRIVER_DC |
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99 &DCAUD_bootstrap, |
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100 #endif |
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101 #if SDL_AUDIO_DRIVER_MMEAUDIO |
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102 &MMEAUDIO_bootstrap, |
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103 #endif |
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104 #if SDL_AUDIO_DRIVER_DART |
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105 &DART_bootstrap, |
| 1190 | 106 #endif |
| 0 | 107 NULL |
| 108 }; | |
| 109 SDL_AudioDevice *current_audio = NULL; | |
| 110 | |
| 111 /* Various local functions */ | |
| 112 int SDL_AudioInit(const char *driver_name); | |
| 113 void SDL_AudioQuit(void); | |
| 114 | |
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115 #if SDL_AUDIO_DRIVER_AHI |
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116 static int audio_configured = 0; |
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117 #endif |
| 0 | 118 |
| 119 /* The general mixing thread function */ | |
| 120 int SDL_RunAudio(void *audiop) | |
| 121 { | |
| 122 SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; | |
| 123 Uint8 *stream; | |
| 124 int stream_len; | |
| 125 void *udata; | |
| 126 void (*fill)(void *userdata,Uint8 *stream, int len); | |
| 127 int silence; | |
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128 #if SDL_AUDIO_DRIVER_AHI |
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129 int started = 0; |
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130 |
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131 /* AmigaOS NEEDS that the audio driver is opened in the thread that uses it! */ |
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132 |
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133 D(bug("Task audio started audio struct:<%lx>...\n",audiop)); |
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134 |
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135 D(bug("Before Openaudio...")); |
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136 if(audio->OpenAudio(audio, &audio->spec)==-1) |
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137 { |
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138 D(bug("Open audio failed...\n")); |
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139 return(-1); |
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140 } |
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141 D(bug("OpenAudio...OK\n")); |
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142 #endif |
| 0 | 143 |
| 144 /* Perform any thread setup */ | |
| 145 if ( audio->ThreadInit ) { | |
| 146 audio->ThreadInit(audio); | |
| 147 } | |
| 148 audio->threadid = SDL_ThreadID(); | |
| 149 | |
| 150 /* Set up the mixing function */ | |
| 151 fill = audio->spec.callback; | |
| 152 udata = audio->spec.userdata; | |
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153 |
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154 #if SDL_AUDIO_DRIVER_AHI |
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155 audio_configured = 1; |
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156 |
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157 D(bug("Audio configured... Checking for conversion\n")); |
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158 SDL_mutexP(audio->mixer_lock); |
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159 D(bug("Semaphore obtained...\n")); |
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160 #endif |
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161 |
| 0 | 162 if ( audio->convert.needed ) { |
| 163 if ( audio->convert.src_format == AUDIO_U8 ) { | |
| 164 silence = 0x80; | |
| 165 } else { | |
| 166 silence = 0; | |
| 167 } | |
| 168 stream_len = audio->convert.len; | |
| 169 } else { | |
| 170 silence = audio->spec.silence; | |
| 171 stream_len = audio->spec.size; | |
| 172 } | |
| 173 stream = audio->fake_stream; | |
| 174 | |
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175 #if SDL_AUDIO_DRIVER_AHI |
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176 SDL_mutexV(audio->mixer_lock); |
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177 D(bug("Entering audio loop...\n")); |
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178 #endif |
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179 |
| 1190 | 180 #ifdef __OS2__ |
| 181 // Increase the priority of this thread to make sure that | |
| 182 // the audio will be continuous all the time! | |
| 183 #ifdef USE_DOSSETPRIORITY | |
| 184 #ifdef DEBUG_BUILD | |
| 185 printf("[SDL_RunAudio] : Setting priority to ForegroundServer+0! (TID%d)\n", SDL_ThreadID()); | |
| 186 #endif | |
| 187 DosSetPriority(PRTYS_THREAD, PRTYC_FOREGROUNDSERVER, 0, 0); | |
| 188 #endif | |
| 189 #endif | |
|
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190 |
| 0 | 191 /* Loop, filling the audio buffers */ |
| 192 while ( audio->enabled ) { | |
| 193 | |
| 194 /* Wait for new current buffer to finish playing */ | |
| 195 if ( stream == audio->fake_stream ) { | |
| 196 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); | |
| 197 } else { | |
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198 #if SDL_AUDIO_DRIVER_AHI |
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199 if ( started > 1 ) |
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200 #endif |
| 0 | 201 audio->WaitAudio(audio); |
| 202 } | |
| 203 | |
| 204 /* Fill the current buffer with sound */ | |
| 205 if ( audio->convert.needed ) { | |
| 206 if ( audio->convert.buf ) { | |
| 207 stream = audio->convert.buf; | |
| 208 } else { | |
| 209 continue; | |
| 210 } | |
| 211 } else { | |
| 212 stream = audio->GetAudioBuf(audio); | |
| 213 if ( stream == NULL ) { | |
| 214 stream = audio->fake_stream; | |
| 215 } | |
| 216 } | |
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217 SDL_memset(stream, silence, stream_len); |
| 0 | 218 |
| 219 if ( ! audio->paused ) { | |
| 220 SDL_mutexP(audio->mixer_lock); | |
| 221 (*fill)(udata, stream, stream_len); | |
| 222 SDL_mutexV(audio->mixer_lock); | |
| 223 } | |
| 224 | |
| 225 /* Convert the audio if necessary */ | |
| 226 if ( audio->convert.needed ) { | |
| 227 SDL_ConvertAudio(&audio->convert); | |
| 228 stream = audio->GetAudioBuf(audio); | |
| 229 if ( stream == NULL ) { | |
| 230 stream = audio->fake_stream; | |
| 231 } | |
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232 SDL_memcpy(stream, audio->convert.buf, |
| 0 | 233 audio->convert.len_cvt); |
| 234 } | |
| 235 | |
| 236 /* Ready current buffer for play and change current buffer */ | |
| 237 if ( stream != audio->fake_stream ) { | |
| 238 audio->PlayAudio(audio); | |
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239 #if SDL_AUDIO_DRIVER_AHI |
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240 /* AmigaOS don't have to wait the first time audio is played! */ |
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241 started++; |
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242 #endif |
| 0 | 243 } |
| 244 } | |
| 245 /* Wait for the audio to drain.. */ | |
| 246 if ( audio->WaitDone ) { | |
| 247 audio->WaitDone(audio); | |
| 248 } | |
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249 |
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250 #if SDL_AUDIO_DRIVER_AHI |
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251 D(bug("WaitAudio...Done\n")); |
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252 |
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253 audio->CloseAudio(audio); |
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254 |
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255 D(bug("CloseAudio..Done, subtask exiting...\n")); |
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256 audio_configured = 0; |
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257 #endif |
| 1190 | 258 #ifdef __OS2__ |
| 259 #ifdef DEBUG_BUILD | |
| 260 printf("[SDL_RunAudio] : Task exiting. (TID%d)\n", SDL_ThreadID()); | |
| 261 #endif | |
| 262 #endif | |
| 0 | 263 return(0); |
| 264 } | |
| 265 | |
|
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266 static void SDL_LockAudio_Default(SDL_AudioDevice *audio) |
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267 { |
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268 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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269 return; |
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270 } |
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271 SDL_mutexP(audio->mixer_lock); |
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272 } |
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273 |
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274 static void SDL_UnlockAudio_Default(SDL_AudioDevice *audio) |
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275 { |
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276 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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277 return; |
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278 } |
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279 SDL_mutexV(audio->mixer_lock); |
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280 } |
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281 |
| 0 | 282 int SDL_AudioInit(const char *driver_name) |
| 283 { | |
| 284 SDL_AudioDevice *audio; | |
| 285 int i = 0, idx; | |
| 286 | |
| 287 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 288 if ( current_audio != NULL ) { | |
| 289 SDL_AudioQuit(); | |
| 290 } | |
| 291 | |
| 292 /* Select the proper audio driver */ | |
| 293 audio = NULL; | |
| 294 idx = 0; | |
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295 #if SDL_AUDIO_DRIVER_ESD |
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296 if ( (driver_name == NULL) && (SDL_getenv("ESPEAKER") != NULL) ) { |
| 0 | 297 /* Ahem, we know that if ESPEAKER is set, user probably wants |
| 298 to use ESD, but don't start it if it's not already running. | |
| 299 This probably isn't the place to do this, but... Shh! :) | |
| 300 */ | |
| 301 for ( i=0; bootstrap[i]; ++i ) { | |
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302 if ( SDL_strcmp(bootstrap[i]->name, "esd") == 0 ) { |
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303 #ifdef HAVE_PUTENV |
| 0 | 304 const char *esd_no_spawn; |
| 305 | |
| 306 /* Don't start ESD if it's not running */ | |
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307 esd_no_spawn = getenv("ESD_NO_SPAWN"); |
| 0 | 308 if ( esd_no_spawn == NULL ) { |
| 309 putenv("ESD_NO_SPAWN=1"); | |
| 310 } | |
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311 #endif |
| 0 | 312 if ( bootstrap[i]->available() ) { |
| 313 audio = bootstrap[i]->create(0); | |
| 314 break; | |
| 315 } | |
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316 #ifdef HAVE_UNSETENV |
| 0 | 317 if ( esd_no_spawn == NULL ) { |
| 318 unsetenv("ESD_NO_SPAWN"); | |
| 319 } | |
| 320 #endif | |
| 321 } | |
| 322 } | |
| 323 } | |
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324 #endif /* SDL_AUDIO_DRIVER_ESD */ |
| 0 | 325 if ( audio == NULL ) { |
| 326 if ( driver_name != NULL ) { | |
| 327 #if 0 /* This will be replaced with a better driver selection API */ | |
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328 if ( SDL_strrchr(driver_name, ':') != NULL ) { |
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329 idx = atoi(SDL_strrchr(driver_name, ':')+1); |
| 0 | 330 } |
| 331 #endif | |
| 332 for ( i=0; bootstrap[i]; ++i ) { | |
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333 if (SDL_strncmp(bootstrap[i]->name, driver_name, |
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334 SDL_strlen(bootstrap[i]->name)) == 0) { |
| 0 | 335 if ( bootstrap[i]->available() ) { |
| 336 audio=bootstrap[i]->create(idx); | |
| 337 break; | |
| 338 } | |
| 339 } | |
| 340 } | |
| 341 } else { | |
| 342 for ( i=0; bootstrap[i]; ++i ) { | |
| 343 if ( bootstrap[i]->available() ) { | |
| 344 audio = bootstrap[i]->create(idx); | |
| 345 if ( audio != NULL ) { | |
| 346 break; | |
| 347 } | |
| 348 } | |
| 349 } | |
| 350 } | |
| 351 if ( audio == NULL ) { | |
| 352 SDL_SetError("No available audio device"); | |
| 353 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 354 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 355 */ | |
| 356 return(-1); | |
| 357 #endif | |
| 358 } | |
| 359 } | |
| 360 current_audio = audio; | |
| 361 if ( current_audio ) { | |
| 362 current_audio->name = bootstrap[i]->name; | |
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363 if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
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364 current_audio->LockAudio = SDL_LockAudio_Default; |
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365 current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
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366 } |
| 0 | 367 } |
| 368 return(0); | |
| 369 } | |
| 370 | |
| 371 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 372 { | |
| 373 if ( current_audio != NULL ) { | |
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374 SDL_strlcpy(namebuf, current_audio->name, maxlen); |
| 0 | 375 return(namebuf); |
| 376 } | |
| 377 return(NULL); | |
| 378 } | |
| 379 | |
| 380 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 381 { | |
| 382 SDL_AudioDevice *audio; | |
| 383 | |
| 384 /* Start up the audio driver, if necessary */ | |
| 385 if ( ! current_audio ) { | |
| 386 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 387 (current_audio == NULL) ) { | |
| 388 return(-1); | |
| 389 } | |
| 390 } | |
| 391 audio = current_audio; | |
| 392 | |
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393 if (audio->opened) { |
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394 SDL_SetError("Audio device is already opened"); |
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395 return(-1); |
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396 } |
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397 |
| 0 | 398 /* Verify some parameters */ |
| 399 if ( desired->callback == NULL ) { | |
| 400 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 401 return(-1); | |
| 402 } | |
| 403 switch ( desired->channels ) { | |
| 404 case 1: /* Mono */ | |
| 405 case 2: /* Stereo */ | |
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406 case 4: /* surround */ |
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407 case 6: /* surround with center and lfe */ |
| 0 | 408 break; |
| 409 default: | |
| 410 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 411 return(-1); | |
| 412 } | |
| 413 | |
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414 #if defined(__MACOS__) || (defined(__RISCOS__) && SDL_THREADS_DISABLED) |
| 0 | 415 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ |
| 416 #else | |
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417 #if defined(__MINT__) && SDL_THREADS_DISABLED |
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418 /* Uses interrupt driven audio, without thread */ |
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419 #else |
| 0 | 420 /* Create a semaphore for locking the sound buffers */ |
| 421 audio->mixer_lock = SDL_CreateMutex(); | |
| 422 if ( audio->mixer_lock == NULL ) { | |
| 423 SDL_SetError("Couldn't create mixer lock"); | |
| 424 SDL_CloseAudio(); | |
| 425 return(-1); | |
| 426 } | |
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427 #endif /* __MINT__ */ |
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428 #endif /* __MACOS__ */ |
| 0 | 429 |
| 430 /* Calculate the silence and size of the audio specification */ | |
| 431 SDL_CalculateAudioSpec(desired); | |
| 432 | |
| 433 /* Open the audio subsystem */ | |
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434 SDL_memcpy(&audio->spec, desired, sizeof(audio->spec)); |
| 0 | 435 audio->convert.needed = 0; |
| 436 audio->enabled = 1; | |
| 437 audio->paused = 1; | |
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438 |
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439 #if !SDL_AUDIO_DRIVER_AHI |
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440 |
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441 /* AmigaOS opens audio inside the main loop */ |
| 0 | 442 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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443 |
| 0 | 444 if ( ! audio->opened ) { |
| 445 SDL_CloseAudio(); | |
| 446 return(-1); | |
| 447 } | |
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448 #else |
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449 D(bug("Locking semaphore...")); |
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450 SDL_mutexP(audio->mixer_lock); |
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451 #endif |
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452 |
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453 #if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC) |
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454 #undef SDL_CreateThread |
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455 audio->thread = SDL_CreateThread(SDL_RunAudio, audio, NULL, NULL); |
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456 #else |
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457 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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458 #endif |
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459 D(bug("Created thread...\n")); |
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460 |
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461 if ( audio->thread == NULL ) { |
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462 SDL_mutexV(audio->mixer_lock); |
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463 SDL_CloseAudio(); |
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464 SDL_SetError("Couldn't create audio thread"); |
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465 return(-1); |
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466 } |
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467 |
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468 #if SDL_AUDIO_DRIVER_AHI |
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469 while(!audio_configured) |
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470 SDL_Delay(100); |
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471 #endif |
| 0 | 472 |
| 473 /* If the audio driver changes the buffer size, accept it */ | |
| 474 if ( audio->spec.samples != desired->samples ) { | |
| 475 desired->samples = audio->spec.samples; | |
| 476 SDL_CalculateAudioSpec(desired); | |
| 477 } | |
| 478 | |
| 479 /* Allocate a fake audio memory buffer */ | |
| 480 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 481 if ( audio->fake_stream == NULL ) { | |
| 482 SDL_CloseAudio(); | |
| 483 SDL_OutOfMemory(); | |
| 484 return(-1); | |
| 485 } | |
| 486 | |
| 487 /* See if we need to do any conversion */ | |
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488 if ( obtained != NULL ) { |
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489 SDL_memcpy(obtained, &audio->spec, sizeof(audio->spec)); |
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490 } else if ( desired->freq != audio->spec.freq || |
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491 desired->format != audio->spec.format || |
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492 desired->channels != audio->spec.channels ) { |
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493 /* Build an audio conversion block */ |
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494 if ( SDL_BuildAudioCVT(&audio->convert, |
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495 desired->format, desired->channels, |
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496 desired->freq, |
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497 audio->spec.format, audio->spec.channels, |
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498 audio->spec.freq) < 0 ) { |
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499 SDL_CloseAudio(); |
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500 return(-1); |
| 0 | 501 } |
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502 if ( audio->convert.needed ) { |
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503 audio->convert.len = desired->size; |
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504 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( |
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505 audio->convert.len*audio->convert.len_mult); |
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506 if ( audio->convert.buf == NULL ) { |
| 0 | 507 SDL_CloseAudio(); |
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508 SDL_OutOfMemory(); |
| 0 | 509 return(-1); |
| 510 } | |
| 511 } | |
| 512 } | |
| 513 | |
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514 #if !SDL_AUDIO_DRIVER_AHI |
| 0 | 515 /* Start the audio thread if necessary */ |
| 516 switch (audio->opened) { | |
| 517 case 1: | |
| 518 /* Start the audio thread */ | |
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519 #if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC) |
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520 #undef SDL_CreateThread |
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521 audio->thread = SDL_CreateThread(SDL_RunAudio, audio, NULL, NULL); |
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522 #else |
| 0 | 523 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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524 #endif |
| 0 | 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 #if !SDL_AUDIO_DRIVER_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 } |