Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 1643:51038e80ae59
More general fix for bug #189
The clipping is done at a higher level, and the low level functions are
passed clipped rectangles. Drivers which don't support source clipping
have not been changed, so the image will be squished instead of clipped,
but at least they will no longer crash when the destination rect was out
of bounds.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 17 Apr 2006 06:47:23 +0000 |
| parents | 12b6d331d82a |
| children | 14717b52abc0 290b5baf2fca |
| 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__ |
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32 /* We'll need the DosSetPriority() API! */ |
| 1190 | 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_BSD |
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40 &BSD_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_DUMMY |
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99 &DUMMYAUD_bootstrap, |
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100 #endif |
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101 #if SDL_AUDIO_DRIVER_DC |
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102 &DCAUD_bootstrap, |
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103 #endif |
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104 #if SDL_AUDIO_DRIVER_MMEAUDIO |
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105 &MMEAUDIO_bootstrap, |
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106 #endif |
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107 #if SDL_AUDIO_DRIVER_DART |
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108 &DART_bootstrap, |
| 1190 | 109 #endif |
| 0 | 110 NULL |
| 111 }; | |
| 112 SDL_AudioDevice *current_audio = NULL; | |
| 113 | |
| 114 /* Various local functions */ | |
| 115 int SDL_AudioInit(const char *driver_name); | |
| 116 void SDL_AudioQuit(void); | |
| 117 | |
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118 #if SDL_AUDIO_DRIVER_AHI |
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119 static int audio_configured = 0; |
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120 #endif |
| 0 | 121 |
| 122 /* The general mixing thread function */ | |
| 123 int SDL_RunAudio(void *audiop) | |
| 124 { | |
| 125 SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; | |
| 126 Uint8 *stream; | |
| 127 int stream_len; | |
| 128 void *udata; | |
| 129 void (*fill)(void *userdata,Uint8 *stream, int len); | |
| 130 int silence; | |
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131 #if SDL_AUDIO_DRIVER_AHI |
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132 int started = 0; |
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133 |
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134 /* AmigaOS NEEDS that the audio driver is opened in the thread that uses it! */ |
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135 |
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136 D(bug("Task audio started audio struct:<%lx>...\n",audiop)); |
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137 |
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138 D(bug("Before Openaudio...")); |
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139 if(audio->OpenAudio(audio, &audio->spec)==-1) |
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140 { |
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141 D(bug("Open audio failed...\n")); |
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142 return(-1); |
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143 } |
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144 D(bug("OpenAudio...OK\n")); |
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145 #endif |
| 0 | 146 |
| 147 /* Perform any thread setup */ | |
| 148 if ( audio->ThreadInit ) { | |
| 149 audio->ThreadInit(audio); | |
| 150 } | |
| 151 audio->threadid = SDL_ThreadID(); | |
| 152 | |
| 153 /* Set up the mixing function */ | |
| 154 fill = audio->spec.callback; | |
| 155 udata = audio->spec.userdata; | |
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156 |
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157 #if SDL_AUDIO_DRIVER_AHI |
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158 audio_configured = 1; |
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159 |
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160 D(bug("Audio configured... Checking for conversion\n")); |
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161 SDL_mutexP(audio->mixer_lock); |
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162 D(bug("Semaphore obtained...\n")); |
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163 #endif |
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164 |
| 0 | 165 if ( audio->convert.needed ) { |
| 166 if ( audio->convert.src_format == AUDIO_U8 ) { | |
| 167 silence = 0x80; | |
| 168 } else { | |
| 169 silence = 0; | |
| 170 } | |
| 171 stream_len = audio->convert.len; | |
| 172 } else { | |
| 173 silence = audio->spec.silence; | |
| 174 stream_len = audio->spec.size; | |
| 175 } | |
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176 |
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177 #if SDL_AUDIO_DRIVER_AHI |
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178 SDL_mutexV(audio->mixer_lock); |
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179 D(bug("Entering audio loop...\n")); |
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180 #endif |
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181 |
| 1190 | 182 #ifdef __OS2__ |
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183 /* Increase the priority of this thread to make sure that |
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184 the audio will be continuous all the time! */ |
| 1190 | 185 #ifdef USE_DOSSETPRIORITY |
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186 if (SDL_getenv("SDL_USE_TIMECRITICAL_AUDIO")) |
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187 { |
| 1190 | 188 #ifdef DEBUG_BUILD |
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189 printf("[SDL_RunAudio] : Setting priority to TimeCritical+0! (TID%d)\n", SDL_ThreadID()); |
| 1190 | 190 #endif |
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191 DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0); |
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192 } |
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193 else |
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194 { |
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195 #ifdef DEBUG_BUILD |
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196 printf("[SDL_RunAudio] : Setting priority to ForegroundServer+0! (TID%d)\n", SDL_ThreadID()); |
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197 #endif |
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198 DosSetPriority(PRTYS_THREAD, PRTYC_FOREGROUNDSERVER, 0, 0); |
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199 } |
| 1190 | 200 #endif |
| 201 #endif | |
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202 |
| 0 | 203 /* Loop, filling the audio buffers */ |
| 204 while ( audio->enabled ) { | |
| 205 | |
| 206 /* Fill the current buffer with sound */ | |
| 207 if ( audio->convert.needed ) { | |
| 208 if ( audio->convert.buf ) { | |
| 209 stream = audio->convert.buf; | |
| 210 } else { | |
| 211 continue; | |
| 212 } | |
| 213 } else { | |
| 214 stream = audio->GetAudioBuf(audio); | |
| 215 if ( stream == NULL ) { | |
| 216 stream = audio->fake_stream; | |
| 217 } | |
| 218 } | |
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219 SDL_memset(stream, silence, stream_len); |
| 0 | 220 |
| 221 if ( ! audio->paused ) { | |
| 222 SDL_mutexP(audio->mixer_lock); | |
| 223 (*fill)(udata, stream, stream_len); | |
| 224 SDL_mutexV(audio->mixer_lock); | |
| 225 } | |
| 226 | |
| 227 /* Convert the audio if necessary */ | |
| 228 if ( audio->convert.needed ) { | |
| 229 SDL_ConvertAudio(&audio->convert); | |
| 230 stream = audio->GetAudioBuf(audio); | |
| 231 if ( stream == NULL ) { | |
| 232 stream = audio->fake_stream; | |
| 233 } | |
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234 SDL_memcpy(stream, audio->convert.buf, |
| 0 | 235 audio->convert.len_cvt); |
| 236 } | |
| 237 | |
| 238 /* Ready current buffer for play and change current buffer */ | |
| 239 if ( stream != audio->fake_stream ) { | |
| 240 audio->PlayAudio(audio); | |
| 1562 | 241 } |
| 242 | |
| 243 /* Wait for an audio buffer to become available */ | |
| 244 if ( stream == audio->fake_stream ) { | |
| 245 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); | |
| 246 } else { | |
| 247 audio->WaitAudio(audio); | |
| 0 | 248 } |
| 249 } | |
| 1562 | 250 |
| 0 | 251 /* Wait for the audio to drain.. */ |
| 252 if ( audio->WaitDone ) { | |
| 253 audio->WaitDone(audio); | |
| 254 } | |
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255 |
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256 #if SDL_AUDIO_DRIVER_AHI |
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257 D(bug("WaitAudio...Done\n")); |
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258 |
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259 audio->CloseAudio(audio); |
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260 |
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261 D(bug("CloseAudio..Done, subtask exiting...\n")); |
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262 audio_configured = 0; |
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263 #endif |
| 1190 | 264 #ifdef __OS2__ |
| 265 #ifdef DEBUG_BUILD | |
| 266 printf("[SDL_RunAudio] : Task exiting. (TID%d)\n", SDL_ThreadID()); | |
| 267 #endif | |
| 268 #endif | |
| 0 | 269 return(0); |
| 270 } | |
| 271 | |
|
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272 static void SDL_LockAudio_Default(SDL_AudioDevice *audio) |
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273 { |
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274 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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275 return; |
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276 } |
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277 SDL_mutexP(audio->mixer_lock); |
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278 } |
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279 |
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280 static void SDL_UnlockAudio_Default(SDL_AudioDevice *audio) |
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281 { |
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282 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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283 return; |
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284 } |
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285 SDL_mutexV(audio->mixer_lock); |
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286 } |
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287 |
| 0 | 288 int SDL_AudioInit(const char *driver_name) |
| 289 { | |
| 290 SDL_AudioDevice *audio; | |
| 291 int i = 0, idx; | |
| 292 | |
| 293 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 294 if ( current_audio != NULL ) { | |
| 295 SDL_AudioQuit(); | |
| 296 } | |
| 297 | |
| 298 /* Select the proper audio driver */ | |
| 299 audio = NULL; | |
| 300 idx = 0; | |
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301 #if SDL_AUDIO_DRIVER_ESD |
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302 if ( (driver_name == NULL) && (SDL_getenv("ESPEAKER") != NULL) ) { |
| 0 | 303 /* Ahem, we know that if ESPEAKER is set, user probably wants |
| 304 to use ESD, but don't start it if it's not already running. | |
| 305 This probably isn't the place to do this, but... Shh! :) | |
| 306 */ | |
| 307 for ( i=0; bootstrap[i]; ++i ) { | |
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308 if ( SDL_strcmp(bootstrap[i]->name, "esd") == 0 ) { |
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309 #ifdef HAVE_PUTENV |
| 0 | 310 const char *esd_no_spawn; |
| 311 | |
| 312 /* Don't start ESD if it's not running */ | |
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313 esd_no_spawn = getenv("ESD_NO_SPAWN"); |
| 0 | 314 if ( esd_no_spawn == NULL ) { |
| 315 putenv("ESD_NO_SPAWN=1"); | |
| 316 } | |
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317 #endif |
| 0 | 318 if ( bootstrap[i]->available() ) { |
| 319 audio = bootstrap[i]->create(0); | |
| 320 break; | |
| 321 } | |
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322 #ifdef HAVE_UNSETENV |
| 0 | 323 if ( esd_no_spawn == NULL ) { |
| 324 unsetenv("ESD_NO_SPAWN"); | |
| 325 } | |
| 326 #endif | |
| 327 } | |
| 328 } | |
| 329 } | |
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330 #endif /* SDL_AUDIO_DRIVER_ESD */ |
| 0 | 331 if ( audio == NULL ) { |
| 332 if ( driver_name != NULL ) { | |
| 333 #if 0 /* This will be replaced with a better driver selection API */ | |
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334 if ( SDL_strrchr(driver_name, ':') != NULL ) { |
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335 idx = atoi(SDL_strrchr(driver_name, ':')+1); |
| 0 | 336 } |
| 337 #endif | |
| 338 for ( i=0; bootstrap[i]; ++i ) { | |
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339 if (SDL_strncmp(bootstrap[i]->name, driver_name, |
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340 SDL_strlen(bootstrap[i]->name)) == 0) { |
| 0 | 341 if ( bootstrap[i]->available() ) { |
| 342 audio=bootstrap[i]->create(idx); | |
| 343 break; | |
| 344 } | |
| 345 } | |
| 346 } | |
| 347 } else { | |
| 348 for ( i=0; bootstrap[i]; ++i ) { | |
| 349 if ( bootstrap[i]->available() ) { | |
| 350 audio = bootstrap[i]->create(idx); | |
| 351 if ( audio != NULL ) { | |
| 352 break; | |
| 353 } | |
| 354 } | |
| 355 } | |
| 356 } | |
| 357 if ( audio == NULL ) { | |
| 358 SDL_SetError("No available audio device"); | |
| 359 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 360 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 361 */ | |
| 362 return(-1); | |
| 363 #endif | |
| 364 } | |
| 365 } | |
| 366 current_audio = audio; | |
| 367 if ( current_audio ) { | |
| 368 current_audio->name = bootstrap[i]->name; | |
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369 if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
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370 current_audio->LockAudio = SDL_LockAudio_Default; |
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371 current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
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372 } |
| 0 | 373 } |
| 374 return(0); | |
| 375 } | |
| 376 | |
| 377 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 378 { | |
| 379 if ( current_audio != NULL ) { | |
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380 SDL_strlcpy(namebuf, current_audio->name, maxlen); |
| 0 | 381 return(namebuf); |
| 382 } | |
| 383 return(NULL); | |
| 384 } | |
| 385 | |
| 386 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 387 { | |
| 388 SDL_AudioDevice *audio; | |
| 389 | |
| 390 /* Start up the audio driver, if necessary */ | |
| 391 if ( ! current_audio ) { | |
| 392 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 393 (current_audio == NULL) ) { | |
| 394 return(-1); | |
| 395 } | |
| 396 } | |
| 397 audio = current_audio; | |
| 398 | |
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399 if (audio->opened) { |
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400 SDL_SetError("Audio device is already opened"); |
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401 return(-1); |
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402 } |
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403 |
| 0 | 404 /* Verify some parameters */ |
| 405 if ( desired->callback == NULL ) { | |
| 406 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 407 return(-1); | |
| 408 } | |
| 409 switch ( desired->channels ) { | |
| 410 case 1: /* Mono */ | |
| 411 case 2: /* Stereo */ | |
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412 case 4: /* surround */ |
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413 case 6: /* surround with center and lfe */ |
| 0 | 414 break; |
| 415 default: | |
| 416 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 417 return(-1); | |
| 418 } | |
| 419 | |
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420 #if defined(__MACOS__) || (defined(__RISCOS__) && SDL_THREADS_DISABLED) |
| 0 | 421 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ |
| 422 #else | |
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423 #if defined(__MINT__) && SDL_THREADS_DISABLED |
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424 /* Uses interrupt driven audio, without thread */ |
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425 #else |
| 0 | 426 /* Create a semaphore for locking the sound buffers */ |
| 427 audio->mixer_lock = SDL_CreateMutex(); | |
| 428 if ( audio->mixer_lock == NULL ) { | |
| 429 SDL_SetError("Couldn't create mixer lock"); | |
| 430 SDL_CloseAudio(); | |
| 431 return(-1); | |
| 432 } | |
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433 #endif /* __MINT__ */ |
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434 #endif /* __MACOS__ */ |
| 0 | 435 |
| 436 /* Calculate the silence and size of the audio specification */ | |
| 437 SDL_CalculateAudioSpec(desired); | |
| 438 | |
| 439 /* Open the audio subsystem */ | |
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440 SDL_memcpy(&audio->spec, desired, sizeof(audio->spec)); |
| 0 | 441 audio->convert.needed = 0; |
| 442 audio->enabled = 1; | |
| 443 audio->paused = 1; | |
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444 |
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445 #if !SDL_AUDIO_DRIVER_AHI |
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446 |
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447 /* AmigaOS opens audio inside the main loop */ |
| 0 | 448 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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449 |
| 0 | 450 if ( ! audio->opened ) { |
| 451 SDL_CloseAudio(); | |
| 452 return(-1); | |
| 453 } | |
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454 #else |
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455 D(bug("Locking semaphore...")); |
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456 SDL_mutexP(audio->mixer_lock); |
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457 |
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458 |
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459 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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460 D(bug("Created thread...\n")); |
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461 |
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462 if ( audio->thread == NULL ) { |
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463 SDL_mutexV(audio->mixer_lock); |
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464 SDL_CloseAudio(); |
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465 SDL_SetError("Couldn't create audio thread"); |
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466 return(-1); |
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467 } |
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468 |
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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 } |