Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 1445:0133f0ca5de7
Need this or things might misbuild on G3 Mac OS, I think.
Potentially fixes Bugzilla #148.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Mon, 27 Feb 2006 01:32:12 +0000 |
| parents | e3242177fe4a |
| children | dc6b59e925a2 |
| 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 | |
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184 if (SDL_getenv("SDL_USE_TIMECRITICAL_AUDIO")) |
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185 { |
| 1190 | 186 #ifdef DEBUG_BUILD |
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187 printf("[SDL_RunAudio] : Setting priority to TimeCritical+0! (TID%d)\n", SDL_ThreadID()); |
| 1190 | 188 #endif |
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189 DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0); |
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190 } |
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191 else |
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192 { |
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193 #ifdef DEBUG_BUILD |
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194 printf("[SDL_RunAudio] : Setting priority to ForegroundServer+0! (TID%d)\n", SDL_ThreadID()); |
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195 #endif |
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196 DosSetPriority(PRTYS_THREAD, PRTYC_FOREGROUNDSERVER, 0, 0); |
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197 } |
| 1190 | 198 #endif |
| 199 #endif | |
|
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200 |
| 0 | 201 /* Loop, filling the audio buffers */ |
| 202 while ( audio->enabled ) { | |
| 203 | |
| 204 /* Wait for new current buffer to finish playing */ | |
| 205 if ( stream == audio->fake_stream ) { | |
| 206 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); | |
| 207 } else { | |
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208 #if SDL_AUDIO_DRIVER_AHI |
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209 if ( started > 1 ) |
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210 #endif |
| 0 | 211 audio->WaitAudio(audio); |
| 212 } | |
| 213 | |
| 214 /* Fill the current buffer with sound */ | |
| 215 if ( audio->convert.needed ) { | |
| 216 if ( audio->convert.buf ) { | |
| 217 stream = audio->convert.buf; | |
| 218 } else { | |
| 219 continue; | |
| 220 } | |
| 221 } else { | |
| 222 stream = audio->GetAudioBuf(audio); | |
| 223 if ( stream == NULL ) { | |
| 224 stream = audio->fake_stream; | |
| 225 } | |
| 226 } | |
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227 SDL_memset(stream, silence, stream_len); |
| 0 | 228 |
| 229 if ( ! audio->paused ) { | |
| 230 SDL_mutexP(audio->mixer_lock); | |
| 231 (*fill)(udata, stream, stream_len); | |
| 232 SDL_mutexV(audio->mixer_lock); | |
| 233 } | |
| 234 | |
| 235 /* Convert the audio if necessary */ | |
| 236 if ( audio->convert.needed ) { | |
| 237 SDL_ConvertAudio(&audio->convert); | |
| 238 stream = audio->GetAudioBuf(audio); | |
| 239 if ( stream == NULL ) { | |
| 240 stream = audio->fake_stream; | |
| 241 } | |
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242 SDL_memcpy(stream, audio->convert.buf, |
| 0 | 243 audio->convert.len_cvt); |
| 244 } | |
| 245 | |
| 246 /* Ready current buffer for play and change current buffer */ | |
| 247 if ( stream != audio->fake_stream ) { | |
| 248 audio->PlayAudio(audio); | |
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249 #if SDL_AUDIO_DRIVER_AHI |
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250 /* AmigaOS don't have to wait the first time audio is played! */ |
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251 started++; |
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252 #endif |
| 0 | 253 } |
| 254 } | |
| 255 /* Wait for the audio to drain.. */ | |
| 256 if ( audio->WaitDone ) { | |
| 257 audio->WaitDone(audio); | |
| 258 } | |
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259 |
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260 #if SDL_AUDIO_DRIVER_AHI |
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261 D(bug("WaitAudio...Done\n")); |
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262 |
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263 audio->CloseAudio(audio); |
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264 |
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265 D(bug("CloseAudio..Done, subtask exiting...\n")); |
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266 audio_configured = 0; |
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267 #endif |
| 1190 | 268 #ifdef __OS2__ |
| 269 #ifdef DEBUG_BUILD | |
| 270 printf("[SDL_RunAudio] : Task exiting. (TID%d)\n", SDL_ThreadID()); | |
| 271 #endif | |
| 272 #endif | |
| 0 | 273 return(0); |
| 274 } | |
| 275 | |
|
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276 static void SDL_LockAudio_Default(SDL_AudioDevice *audio) |
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277 { |
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278 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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279 return; |
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280 } |
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281 SDL_mutexP(audio->mixer_lock); |
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282 } |
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283 |
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284 static void SDL_UnlockAudio_Default(SDL_AudioDevice *audio) |
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285 { |
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286 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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287 return; |
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288 } |
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289 SDL_mutexV(audio->mixer_lock); |
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290 } |
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291 |
| 0 | 292 int SDL_AudioInit(const char *driver_name) |
| 293 { | |
| 294 SDL_AudioDevice *audio; | |
| 295 int i = 0, idx; | |
| 296 | |
| 297 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 298 if ( current_audio != NULL ) { | |
| 299 SDL_AudioQuit(); | |
| 300 } | |
| 301 | |
| 302 /* Select the proper audio driver */ | |
| 303 audio = NULL; | |
| 304 idx = 0; | |
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305 #if SDL_AUDIO_DRIVER_ESD |
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306 if ( (driver_name == NULL) && (SDL_getenv("ESPEAKER") != NULL) ) { |
| 0 | 307 /* Ahem, we know that if ESPEAKER is set, user probably wants |
| 308 to use ESD, but don't start it if it's not already running. | |
| 309 This probably isn't the place to do this, but... Shh! :) | |
| 310 */ | |
| 311 for ( i=0; bootstrap[i]; ++i ) { | |
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312 if ( SDL_strcmp(bootstrap[i]->name, "esd") == 0 ) { |
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313 #ifdef HAVE_PUTENV |
| 0 | 314 const char *esd_no_spawn; |
| 315 | |
| 316 /* Don't start ESD if it's not running */ | |
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317 esd_no_spawn = getenv("ESD_NO_SPAWN"); |
| 0 | 318 if ( esd_no_spawn == NULL ) { |
| 319 putenv("ESD_NO_SPAWN=1"); | |
| 320 } | |
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321 #endif |
| 0 | 322 if ( bootstrap[i]->available() ) { |
| 323 audio = bootstrap[i]->create(0); | |
| 324 break; | |
| 325 } | |
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326 #ifdef HAVE_UNSETENV |
| 0 | 327 if ( esd_no_spawn == NULL ) { |
| 328 unsetenv("ESD_NO_SPAWN"); | |
| 329 } | |
| 330 #endif | |
| 331 } | |
| 332 } | |
| 333 } | |
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334 #endif /* SDL_AUDIO_DRIVER_ESD */ |
| 0 | 335 if ( audio == NULL ) { |
| 336 if ( driver_name != NULL ) { | |
| 337 #if 0 /* This will be replaced with a better driver selection API */ | |
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338 if ( SDL_strrchr(driver_name, ':') != NULL ) { |
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339 idx = atoi(SDL_strrchr(driver_name, ':')+1); |
| 0 | 340 } |
| 341 #endif | |
| 342 for ( i=0; bootstrap[i]; ++i ) { | |
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343 if (SDL_strncmp(bootstrap[i]->name, driver_name, |
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344 SDL_strlen(bootstrap[i]->name)) == 0) { |
| 0 | 345 if ( bootstrap[i]->available() ) { |
| 346 audio=bootstrap[i]->create(idx); | |
| 347 break; | |
| 348 } | |
| 349 } | |
| 350 } | |
| 351 } else { | |
| 352 for ( i=0; bootstrap[i]; ++i ) { | |
| 353 if ( bootstrap[i]->available() ) { | |
| 354 audio = bootstrap[i]->create(idx); | |
| 355 if ( audio != NULL ) { | |
| 356 break; | |
| 357 } | |
| 358 } | |
| 359 } | |
| 360 } | |
| 361 if ( audio == NULL ) { | |
| 362 SDL_SetError("No available audio device"); | |
| 363 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 364 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 365 */ | |
| 366 return(-1); | |
| 367 #endif | |
| 368 } | |
| 369 } | |
| 370 current_audio = audio; | |
| 371 if ( current_audio ) { | |
| 372 current_audio->name = bootstrap[i]->name; | |
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373 if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
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374 current_audio->LockAudio = SDL_LockAudio_Default; |
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375 current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
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376 } |
| 0 | 377 } |
| 378 return(0); | |
| 379 } | |
| 380 | |
| 381 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 382 { | |
| 383 if ( current_audio != NULL ) { | |
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384 SDL_strlcpy(namebuf, current_audio->name, maxlen); |
| 0 | 385 return(namebuf); |
| 386 } | |
| 387 return(NULL); | |
| 388 } | |
| 389 | |
| 390 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 391 { | |
| 392 SDL_AudioDevice *audio; | |
| 393 | |
| 394 /* Start up the audio driver, if necessary */ | |
| 395 if ( ! current_audio ) { | |
| 396 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 397 (current_audio == NULL) ) { | |
| 398 return(-1); | |
| 399 } | |
| 400 } | |
| 401 audio = current_audio; | |
| 402 | |
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403 if (audio->opened) { |
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404 SDL_SetError("Audio device is already opened"); |
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405 return(-1); |
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406 } |
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407 |
| 0 | 408 /* Verify some parameters */ |
| 409 if ( desired->callback == NULL ) { | |
| 410 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 411 return(-1); | |
| 412 } | |
| 413 switch ( desired->channels ) { | |
| 414 case 1: /* Mono */ | |
| 415 case 2: /* Stereo */ | |
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416 case 4: /* surround */ |
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417 case 6: /* surround with center and lfe */ |
| 0 | 418 break; |
| 419 default: | |
| 420 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 421 return(-1); | |
| 422 } | |
| 423 | |
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424 #if defined(__MACOS__) || (defined(__RISCOS__) && SDL_THREADS_DISABLED) |
| 0 | 425 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ |
| 426 #else | |
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427 #if defined(__MINT__) && SDL_THREADS_DISABLED |
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428 /* Uses interrupt driven audio, without thread */ |
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429 #else |
| 0 | 430 /* Create a semaphore for locking the sound buffers */ |
| 431 audio->mixer_lock = SDL_CreateMutex(); | |
| 432 if ( audio->mixer_lock == NULL ) { | |
| 433 SDL_SetError("Couldn't create mixer lock"); | |
| 434 SDL_CloseAudio(); | |
| 435 return(-1); | |
| 436 } | |
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437 #endif /* __MINT__ */ |
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438 #endif /* __MACOS__ */ |
| 0 | 439 |
| 440 /* Calculate the silence and size of the audio specification */ | |
| 441 SDL_CalculateAudioSpec(desired); | |
| 442 | |
| 443 /* Open the audio subsystem */ | |
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444 SDL_memcpy(&audio->spec, desired, sizeof(audio->spec)); |
| 0 | 445 audio->convert.needed = 0; |
| 446 audio->enabled = 1; | |
| 447 audio->paused = 1; | |
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448 |
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449 #if !SDL_AUDIO_DRIVER_AHI |
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450 |
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451 /* AmigaOS opens audio inside the main loop */ |
| 0 | 452 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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453 |
| 0 | 454 if ( ! audio->opened ) { |
| 455 SDL_CloseAudio(); | |
| 456 return(-1); | |
| 457 } | |
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458 #else |
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459 D(bug("Locking semaphore...")); |
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460 SDL_mutexP(audio->mixer_lock); |
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461 |
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462 |
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463 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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464 D(bug("Created thread...\n")); |
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465 |
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466 if ( audio->thread == NULL ) { |
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467 SDL_mutexV(audio->mixer_lock); |
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468 SDL_CloseAudio(); |
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469 SDL_SetError("Couldn't create audio thread"); |
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470 return(-1); |
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471 } |
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472 |
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473 while(!audio_configured) |
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474 SDL_Delay(100); |
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475 #endif |
| 0 | 476 |
| 477 /* If the audio driver changes the buffer size, accept it */ | |
| 478 if ( audio->spec.samples != desired->samples ) { | |
| 479 desired->samples = audio->spec.samples; | |
| 480 SDL_CalculateAudioSpec(desired); | |
| 481 } | |
| 482 | |
| 483 /* Allocate a fake audio memory buffer */ | |
| 484 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 485 if ( audio->fake_stream == NULL ) { | |
| 486 SDL_CloseAudio(); | |
| 487 SDL_OutOfMemory(); | |
| 488 return(-1); | |
| 489 } | |
| 490 | |
| 491 /* See if we need to do any conversion */ | |
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492 if ( obtained != NULL ) { |
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493 SDL_memcpy(obtained, &audio->spec, sizeof(audio->spec)); |
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494 } else if ( desired->freq != audio->spec.freq || |
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495 desired->format != audio->spec.format || |
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496 desired->channels != audio->spec.channels ) { |
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497 /* Build an audio conversion block */ |
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498 if ( SDL_BuildAudioCVT(&audio->convert, |
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499 desired->format, desired->channels, |
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500 desired->freq, |
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501 audio->spec.format, audio->spec.channels, |
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502 audio->spec.freq) < 0 ) { |
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503 SDL_CloseAudio(); |
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504 return(-1); |
| 0 | 505 } |
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506 if ( audio->convert.needed ) { |
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507 audio->convert.len = desired->size; |
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508 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( |
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509 audio->convert.len*audio->convert.len_mult); |
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510 if ( audio->convert.buf == NULL ) { |
| 0 | 511 SDL_CloseAudio(); |
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512 SDL_OutOfMemory(); |
| 0 | 513 return(-1); |
| 514 } | |
| 515 } | |
| 516 } | |
| 517 | |
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518 #if !SDL_AUDIO_DRIVER_AHI |
| 0 | 519 /* Start the audio thread if necessary */ |
| 520 switch (audio->opened) { | |
| 521 case 1: | |
| 522 /* Start the audio thread */ | |
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523 #if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC) |
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524 #undef SDL_CreateThread |
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525 audio->thread = SDL_CreateThread(SDL_RunAudio, audio, NULL, NULL); |
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526 #else |
| 0 | 527 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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528 #endif |
| 0 | 529 if ( audio->thread == NULL ) { |
| 530 SDL_CloseAudio(); | |
| 531 SDL_SetError("Couldn't create audio thread"); | |
| 532 return(-1); | |
| 533 } | |
| 534 break; | |
| 535 | |
| 536 default: | |
| 537 /* The audio is now playing */ | |
| 538 break; | |
| 539 } | |
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540 #else |
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541 SDL_mutexV(audio->mixer_lock); |
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542 D(bug("SDL_OpenAudio USCITA...\n")); |
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543 |
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544 #endif |
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545 |
| 0 | 546 return(0); |
| 547 } | |
| 548 | |
| 549 SDL_audiostatus SDL_GetAudioStatus(void) | |
| 550 { | |
| 551 SDL_AudioDevice *audio = current_audio; | |
| 552 SDL_audiostatus status; | |
| 553 | |
| 554 status = SDL_AUDIO_STOPPED; | |
| 555 if ( audio && audio->enabled ) { | |
| 556 if ( audio->paused ) { | |
| 557 status = SDL_AUDIO_PAUSED; | |
| 558 } else { | |
| 559 status = SDL_AUDIO_PLAYING; | |
| 560 } | |
| 561 } | |
| 562 return(status); | |
| 563 } | |
| 564 | |
| 565 void SDL_PauseAudio (int pause_on) | |
| 566 { | |
| 567 SDL_AudioDevice *audio = current_audio; | |
| 568 | |
| 569 if ( audio ) { | |
| 570 audio->paused = pause_on; | |
| 571 } | |
| 572 } | |
| 573 | |
| 574 void SDL_LockAudio (void) | |
| 575 { | |
| 576 SDL_AudioDevice *audio = current_audio; | |
| 577 | |
| 578 /* Obtain a lock on the mixing buffers */ | |
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579 if ( audio && audio->LockAudio ) { |
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580 audio->LockAudio(audio); |
| 0 | 581 } |
| 582 } | |
| 583 | |
| 584 void SDL_UnlockAudio (void) | |
| 585 { | |
| 586 SDL_AudioDevice *audio = current_audio; | |
| 587 | |
| 588 /* Release lock on the mixing buffers */ | |
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589 if ( audio && audio->UnlockAudio ) { |
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590 audio->UnlockAudio(audio); |
| 0 | 591 } |
| 592 } | |
| 593 | |
| 594 void SDL_CloseAudio (void) | |
| 595 { | |
| 596 SDL_QuitSubSystem(SDL_INIT_AUDIO); | |
| 597 } | |
| 598 | |
| 599 void SDL_AudioQuit(void) | |
| 600 { | |
| 601 SDL_AudioDevice *audio = current_audio; | |
| 602 | |
| 603 if ( audio ) { | |
| 604 audio->enabled = 0; | |
| 605 if ( audio->thread != NULL ) { | |
| 606 SDL_WaitThread(audio->thread, NULL); | |
| 607 } | |
| 608 if ( audio->mixer_lock != NULL ) { | |
| 609 SDL_DestroyMutex(audio->mixer_lock); | |
| 610 } | |
| 611 if ( audio->fake_stream != NULL ) { | |
| 612 SDL_FreeAudioMem(audio->fake_stream); | |
| 613 } | |
| 614 if ( audio->convert.needed ) { | |
| 615 SDL_FreeAudioMem(audio->convert.buf); | |
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616 |
| 0 | 617 } |
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618 #if !SDL_AUDIO_DRIVER_AHI |
| 0 | 619 if ( audio->opened ) { |
| 620 audio->CloseAudio(audio); | |
| 621 audio->opened = 0; | |
| 622 } | |
|
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623 #endif |
| 0 | 624 /* Free the driver data */ |
| 625 audio->free(audio); | |
| 626 current_audio = NULL; | |
| 627 } | |
| 628 } | |
| 629 | |
| 630 #define NUM_FORMATS 6 | |
| 631 static int format_idx; | |
| 632 static int format_idx_sub; | |
| 633 static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { | |
| 634 { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 635 { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 636 { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 637 { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 638 { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 639 { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 640 }; | |
| 641 | |
| 642 Uint16 SDL_FirstAudioFormat(Uint16 format) | |
| 643 { | |
| 644 for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { | |
| 645 if ( format_list[format_idx][0] == format ) { | |
| 646 break; | |
| 647 } | |
| 648 } | |
| 649 format_idx_sub = 0; | |
| 650 return(SDL_NextAudioFormat()); | |
| 651 } | |
| 652 | |
| 653 Uint16 SDL_NextAudioFormat(void) | |
| 654 { | |
| 655 if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { | |
| 656 return(0); | |
| 657 } | |
| 658 return(format_list[format_idx][format_idx_sub++]); | |
| 659 } | |
| 660 | |
| 661 void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) | |
| 662 { | |
| 663 switch (spec->format) { | |
| 664 case AUDIO_U8: | |
| 665 spec->silence = 0x80; | |
| 666 break; | |
| 667 default: | |
| 668 spec->silence = 0x00; | |
| 669 break; | |
| 670 } | |
| 671 spec->size = (spec->format&0xFF)/8; | |
| 672 spec->size *= spec->channels; | |
| 673 spec->size *= spec->samples; | |
| 674 } |