Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 1561:c724c4a99759
Try to fill the hardware audio buffer immediately.
Fixes Bugzilla #18.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Tue, 21 Mar 2006 00:56:10 +0000 |
| parents | 30f189cdd82b |
| children | 1d487a3fab41 |
| 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_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_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 stream = audio->GetAudioBuf(audio); |
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178 if ( stream == NULL ) { |
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179 stream = audio->fake_stream; |
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180 } |
| 0 | 181 |
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182 #if SDL_AUDIO_DRIVER_AHI |
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183 SDL_mutexV(audio->mixer_lock); |
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184 D(bug("Entering audio loop...\n")); |
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185 #endif |
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186 |
| 1190 | 187 #ifdef __OS2__ |
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188 /* Increase the priority of this thread to make sure that |
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189 the audio will be continuous all the time! */ |
| 1190 | 190 #ifdef USE_DOSSETPRIORITY |
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191 if (SDL_getenv("SDL_USE_TIMECRITICAL_AUDIO")) |
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192 { |
| 1190 | 193 #ifdef DEBUG_BUILD |
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194 printf("[SDL_RunAudio] : Setting priority to TimeCritical+0! (TID%d)\n", SDL_ThreadID()); |
| 1190 | 195 #endif |
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196 DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0); |
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197 } |
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198 else |
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199 { |
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200 #ifdef DEBUG_BUILD |
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201 printf("[SDL_RunAudio] : Setting priority to ForegroundServer+0! (TID%d)\n", SDL_ThreadID()); |
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202 #endif |
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203 DosSetPriority(PRTYS_THREAD, PRTYC_FOREGROUNDSERVER, 0, 0); |
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204 } |
| 1190 | 205 #endif |
| 206 #endif | |
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207 |
| 0 | 208 /* Loop, filling the audio buffers */ |
| 209 while ( audio->enabled ) { | |
| 210 | |
| 211 /* Wait for new current buffer to finish playing */ | |
| 212 if ( stream == audio->fake_stream ) { | |
| 213 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); | |
| 214 } else { | |
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215 #if SDL_AUDIO_DRIVER_AHI |
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216 if ( started > 1 ) |
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217 #endif |
| 0 | 218 audio->WaitAudio(audio); |
| 219 } | |
| 220 | |
| 221 /* Fill the current buffer with sound */ | |
| 222 if ( audio->convert.needed ) { | |
| 223 if ( audio->convert.buf ) { | |
| 224 stream = audio->convert.buf; | |
| 225 } else { | |
| 226 continue; | |
| 227 } | |
| 228 } else { | |
| 229 stream = audio->GetAudioBuf(audio); | |
| 230 if ( stream == NULL ) { | |
| 231 stream = audio->fake_stream; | |
| 232 } | |
| 233 } | |
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234 SDL_memset(stream, silence, stream_len); |
| 0 | 235 |
| 236 if ( ! audio->paused ) { | |
| 237 SDL_mutexP(audio->mixer_lock); | |
| 238 (*fill)(udata, stream, stream_len); | |
| 239 SDL_mutexV(audio->mixer_lock); | |
| 240 } | |
| 241 | |
| 242 /* Convert the audio if necessary */ | |
| 243 if ( audio->convert.needed ) { | |
| 244 SDL_ConvertAudio(&audio->convert); | |
| 245 stream = audio->GetAudioBuf(audio); | |
| 246 if ( stream == NULL ) { | |
| 247 stream = audio->fake_stream; | |
| 248 } | |
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249 SDL_memcpy(stream, audio->convert.buf, |
| 0 | 250 audio->convert.len_cvt); |
| 251 } | |
| 252 | |
| 253 /* Ready current buffer for play and change current buffer */ | |
| 254 if ( stream != audio->fake_stream ) { | |
| 255 audio->PlayAudio(audio); | |
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256 #if SDL_AUDIO_DRIVER_AHI |
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257 /* AmigaOS don't have to wait the first time audio is played! */ |
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258 started++; |
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259 #endif |
| 0 | 260 } |
| 261 } | |
| 262 /* Wait for the audio to drain.. */ | |
| 263 if ( audio->WaitDone ) { | |
| 264 audio->WaitDone(audio); | |
| 265 } | |
|
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266 |
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267 #if SDL_AUDIO_DRIVER_AHI |
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268 D(bug("WaitAudio...Done\n")); |
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269 |
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270 audio->CloseAudio(audio); |
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271 |
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272 D(bug("CloseAudio..Done, subtask exiting...\n")); |
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273 audio_configured = 0; |
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274 #endif |
| 1190 | 275 #ifdef __OS2__ |
| 276 #ifdef DEBUG_BUILD | |
| 277 printf("[SDL_RunAudio] : Task exiting. (TID%d)\n", SDL_ThreadID()); | |
| 278 #endif | |
| 279 #endif | |
| 0 | 280 return(0); |
| 281 } | |
| 282 | |
|
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283 static void SDL_LockAudio_Default(SDL_AudioDevice *audio) |
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284 { |
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285 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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286 return; |
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287 } |
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288 SDL_mutexP(audio->mixer_lock); |
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289 } |
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290 |
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291 static void SDL_UnlockAudio_Default(SDL_AudioDevice *audio) |
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292 { |
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293 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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294 return; |
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295 } |
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296 SDL_mutexV(audio->mixer_lock); |
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297 } |
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298 |
| 0 | 299 int SDL_AudioInit(const char *driver_name) |
| 300 { | |
| 301 SDL_AudioDevice *audio; | |
| 302 int i = 0, idx; | |
| 303 | |
| 304 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 305 if ( current_audio != NULL ) { | |
| 306 SDL_AudioQuit(); | |
| 307 } | |
| 308 | |
| 309 /* Select the proper audio driver */ | |
| 310 audio = NULL; | |
| 311 idx = 0; | |
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312 #if SDL_AUDIO_DRIVER_ESD |
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313 if ( (driver_name == NULL) && (SDL_getenv("ESPEAKER") != NULL) ) { |
| 0 | 314 /* Ahem, we know that if ESPEAKER is set, user probably wants |
| 315 to use ESD, but don't start it if it's not already running. | |
| 316 This probably isn't the place to do this, but... Shh! :) | |
| 317 */ | |
| 318 for ( i=0; bootstrap[i]; ++i ) { | |
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319 if ( SDL_strcmp(bootstrap[i]->name, "esd") == 0 ) { |
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320 #ifdef HAVE_PUTENV |
| 0 | 321 const char *esd_no_spawn; |
| 322 | |
| 323 /* Don't start ESD if it's not running */ | |
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324 esd_no_spawn = getenv("ESD_NO_SPAWN"); |
| 0 | 325 if ( esd_no_spawn == NULL ) { |
| 326 putenv("ESD_NO_SPAWN=1"); | |
| 327 } | |
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328 #endif |
| 0 | 329 if ( bootstrap[i]->available() ) { |
| 330 audio = bootstrap[i]->create(0); | |
| 331 break; | |
| 332 } | |
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333 #ifdef HAVE_UNSETENV |
| 0 | 334 if ( esd_no_spawn == NULL ) { |
| 335 unsetenv("ESD_NO_SPAWN"); | |
| 336 } | |
| 337 #endif | |
| 338 } | |
| 339 } | |
| 340 } | |
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341 #endif /* SDL_AUDIO_DRIVER_ESD */ |
| 0 | 342 if ( audio == NULL ) { |
| 343 if ( driver_name != NULL ) { | |
| 344 #if 0 /* This will be replaced with a better driver selection API */ | |
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345 if ( SDL_strrchr(driver_name, ':') != NULL ) { |
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346 idx = atoi(SDL_strrchr(driver_name, ':')+1); |
| 0 | 347 } |
| 348 #endif | |
| 349 for ( i=0; bootstrap[i]; ++i ) { | |
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350 if (SDL_strncmp(bootstrap[i]->name, driver_name, |
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351 SDL_strlen(bootstrap[i]->name)) == 0) { |
| 0 | 352 if ( bootstrap[i]->available() ) { |
| 353 audio=bootstrap[i]->create(idx); | |
| 354 break; | |
| 355 } | |
| 356 } | |
| 357 } | |
| 358 } else { | |
| 359 for ( i=0; bootstrap[i]; ++i ) { | |
| 360 if ( bootstrap[i]->available() ) { | |
| 361 audio = bootstrap[i]->create(idx); | |
| 362 if ( audio != NULL ) { | |
| 363 break; | |
| 364 } | |
| 365 } | |
| 366 } | |
| 367 } | |
| 368 if ( audio == NULL ) { | |
| 369 SDL_SetError("No available audio device"); | |
| 370 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 371 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 372 */ | |
| 373 return(-1); | |
| 374 #endif | |
| 375 } | |
| 376 } | |
| 377 current_audio = audio; | |
| 378 if ( current_audio ) { | |
| 379 current_audio->name = bootstrap[i]->name; | |
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380 if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
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381 current_audio->LockAudio = SDL_LockAudio_Default; |
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382 current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
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383 } |
| 0 | 384 } |
| 385 return(0); | |
| 386 } | |
| 387 | |
| 388 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 389 { | |
| 390 if ( current_audio != NULL ) { | |
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391 SDL_strlcpy(namebuf, current_audio->name, maxlen); |
| 0 | 392 return(namebuf); |
| 393 } | |
| 394 return(NULL); | |
| 395 } | |
| 396 | |
| 397 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 398 { | |
| 399 SDL_AudioDevice *audio; | |
| 400 | |
| 401 /* Start up the audio driver, if necessary */ | |
| 402 if ( ! current_audio ) { | |
| 403 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 404 (current_audio == NULL) ) { | |
| 405 return(-1); | |
| 406 } | |
| 407 } | |
| 408 audio = current_audio; | |
| 409 | |
|
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410 if (audio->opened) { |
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411 SDL_SetError("Audio device is already opened"); |
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412 return(-1); |
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413 } |
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414 |
| 0 | 415 /* Verify some parameters */ |
| 416 if ( desired->callback == NULL ) { | |
| 417 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 418 return(-1); | |
| 419 } | |
| 420 switch ( desired->channels ) { | |
| 421 case 1: /* Mono */ | |
| 422 case 2: /* Stereo */ | |
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423 case 4: /* surround */ |
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424 case 6: /* surround with center and lfe */ |
| 0 | 425 break; |
| 426 default: | |
| 427 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 428 return(-1); | |
| 429 } | |
| 430 | |
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431 #if defined(__MACOS__) || (defined(__RISCOS__) && SDL_THREADS_DISABLED) |
| 0 | 432 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ |
| 433 #else | |
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434 #if defined(__MINT__) && SDL_THREADS_DISABLED |
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435 /* Uses interrupt driven audio, without thread */ |
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436 #else |
| 0 | 437 /* Create a semaphore for locking the sound buffers */ |
| 438 audio->mixer_lock = SDL_CreateMutex(); | |
| 439 if ( audio->mixer_lock == NULL ) { | |
| 440 SDL_SetError("Couldn't create mixer lock"); | |
| 441 SDL_CloseAudio(); | |
| 442 return(-1); | |
| 443 } | |
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444 #endif /* __MINT__ */ |
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445 #endif /* __MACOS__ */ |
| 0 | 446 |
| 447 /* Calculate the silence and size of the audio specification */ | |
| 448 SDL_CalculateAudioSpec(desired); | |
| 449 | |
| 450 /* Open the audio subsystem */ | |
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451 SDL_memcpy(&audio->spec, desired, sizeof(audio->spec)); |
| 0 | 452 audio->convert.needed = 0; |
| 453 audio->enabled = 1; | |
| 454 audio->paused = 1; | |
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455 |
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456 #if !SDL_AUDIO_DRIVER_AHI |
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457 |
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458 /* AmigaOS opens audio inside the main loop */ |
| 0 | 459 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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460 |
| 0 | 461 if ( ! audio->opened ) { |
| 462 SDL_CloseAudio(); | |
| 463 return(-1); | |
| 464 } | |
|
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465 #else |
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466 D(bug("Locking semaphore...")); |
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467 SDL_mutexP(audio->mixer_lock); |
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468 |
|
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469 |
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470 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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471 D(bug("Created thread...\n")); |
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472 |
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473 if ( audio->thread == NULL ) { |
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474 SDL_mutexV(audio->mixer_lock); |
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475 SDL_CloseAudio(); |
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476 SDL_SetError("Couldn't create audio thread"); |
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477 return(-1); |
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478 } |
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479 |
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480 while(!audio_configured) |
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481 SDL_Delay(100); |
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482 #endif |
| 0 | 483 |
| 484 /* If the audio driver changes the buffer size, accept it */ | |
| 485 if ( audio->spec.samples != desired->samples ) { | |
| 486 desired->samples = audio->spec.samples; | |
| 487 SDL_CalculateAudioSpec(desired); | |
| 488 } | |
| 489 | |
| 490 /* Allocate a fake audio memory buffer */ | |
| 491 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 492 if ( audio->fake_stream == NULL ) { | |
| 493 SDL_CloseAudio(); | |
| 494 SDL_OutOfMemory(); | |
| 495 return(-1); | |
| 496 } | |
| 497 | |
| 498 /* See if we need to do any conversion */ | |
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499 if ( obtained != NULL ) { |
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500 SDL_memcpy(obtained, &audio->spec, sizeof(audio->spec)); |
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501 } else if ( desired->freq != audio->spec.freq || |
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502 desired->format != audio->spec.format || |
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503 desired->channels != audio->spec.channels ) { |
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504 /* Build an audio conversion block */ |
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505 if ( SDL_BuildAudioCVT(&audio->convert, |
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506 desired->format, desired->channels, |
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507 desired->freq, |
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508 audio->spec.format, audio->spec.channels, |
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509 audio->spec.freq) < 0 ) { |
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510 SDL_CloseAudio(); |
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511 return(-1); |
| 0 | 512 } |
|
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513 if ( audio->convert.needed ) { |
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514 audio->convert.len = desired->size; |
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515 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( |
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516 audio->convert.len*audio->convert.len_mult); |
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517 if ( audio->convert.buf == NULL ) { |
| 0 | 518 SDL_CloseAudio(); |
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519 SDL_OutOfMemory(); |
| 0 | 520 return(-1); |
| 521 } | |
| 522 } | |
| 523 } | |
| 524 | |
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525 #if !SDL_AUDIO_DRIVER_AHI |
| 0 | 526 /* Start the audio thread if necessary */ |
| 527 switch (audio->opened) { | |
| 528 case 1: | |
| 529 /* Start the audio thread */ | |
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530 #if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC) |
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531 #undef SDL_CreateThread |
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532 audio->thread = SDL_CreateThread(SDL_RunAudio, audio, NULL, NULL); |
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533 #else |
| 0 | 534 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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535 #endif |
| 0 | 536 if ( audio->thread == NULL ) { |
| 537 SDL_CloseAudio(); | |
| 538 SDL_SetError("Couldn't create audio thread"); | |
| 539 return(-1); | |
| 540 } | |
| 541 break; | |
| 542 | |
| 543 default: | |
| 544 /* The audio is now playing */ | |
| 545 break; | |
| 546 } | |
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547 #else |
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548 SDL_mutexV(audio->mixer_lock); |
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549 D(bug("SDL_OpenAudio USCITA...\n")); |
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550 |
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551 #endif |
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552 |
| 0 | 553 return(0); |
| 554 } | |
| 555 | |
| 556 SDL_audiostatus SDL_GetAudioStatus(void) | |
| 557 { | |
| 558 SDL_AudioDevice *audio = current_audio; | |
| 559 SDL_audiostatus status; | |
| 560 | |
| 561 status = SDL_AUDIO_STOPPED; | |
| 562 if ( audio && audio->enabled ) { | |
| 563 if ( audio->paused ) { | |
| 564 status = SDL_AUDIO_PAUSED; | |
| 565 } else { | |
| 566 status = SDL_AUDIO_PLAYING; | |
| 567 } | |
| 568 } | |
| 569 return(status); | |
| 570 } | |
| 571 | |
| 572 void SDL_PauseAudio (int pause_on) | |
| 573 { | |
| 574 SDL_AudioDevice *audio = current_audio; | |
| 575 | |
| 576 if ( audio ) { | |
| 577 audio->paused = pause_on; | |
| 578 } | |
| 579 } | |
| 580 | |
| 581 void SDL_LockAudio (void) | |
| 582 { | |
| 583 SDL_AudioDevice *audio = current_audio; | |
| 584 | |
| 585 /* Obtain a lock on the mixing buffers */ | |
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586 if ( audio && audio->LockAudio ) { |
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587 audio->LockAudio(audio); |
| 0 | 588 } |
| 589 } | |
| 590 | |
| 591 void SDL_UnlockAudio (void) | |
| 592 { | |
| 593 SDL_AudioDevice *audio = current_audio; | |
| 594 | |
| 595 /* Release lock on the mixing buffers */ | |
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596 if ( audio && audio->UnlockAudio ) { |
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597 audio->UnlockAudio(audio); |
| 0 | 598 } |
| 599 } | |
| 600 | |
| 601 void SDL_CloseAudio (void) | |
| 602 { | |
| 603 SDL_QuitSubSystem(SDL_INIT_AUDIO); | |
| 604 } | |
| 605 | |
| 606 void SDL_AudioQuit(void) | |
| 607 { | |
| 608 SDL_AudioDevice *audio = current_audio; | |
| 609 | |
| 610 if ( audio ) { | |
| 611 audio->enabled = 0; | |
| 612 if ( audio->thread != NULL ) { | |
| 613 SDL_WaitThread(audio->thread, NULL); | |
| 614 } | |
| 615 if ( audio->mixer_lock != NULL ) { | |
| 616 SDL_DestroyMutex(audio->mixer_lock); | |
| 617 } | |
| 618 if ( audio->fake_stream != NULL ) { | |
| 619 SDL_FreeAudioMem(audio->fake_stream); | |
| 620 } | |
| 621 if ( audio->convert.needed ) { | |
| 622 SDL_FreeAudioMem(audio->convert.buf); | |
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623 |
| 0 | 624 } |
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625 #if !SDL_AUDIO_DRIVER_AHI |
| 0 | 626 if ( audio->opened ) { |
| 627 audio->CloseAudio(audio); | |
| 628 audio->opened = 0; | |
| 629 } | |
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630 #endif |
| 0 | 631 /* Free the driver data */ |
| 632 audio->free(audio); | |
| 633 current_audio = NULL; | |
| 634 } | |
| 635 } | |
| 636 | |
| 637 #define NUM_FORMATS 6 | |
| 638 static int format_idx; | |
| 639 static int format_idx_sub; | |
| 640 static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { | |
| 641 { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 642 { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 643 { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 644 { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 645 { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 646 { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 647 }; | |
| 648 | |
| 649 Uint16 SDL_FirstAudioFormat(Uint16 format) | |
| 650 { | |
| 651 for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { | |
| 652 if ( format_list[format_idx][0] == format ) { | |
| 653 break; | |
| 654 } | |
| 655 } | |
| 656 format_idx_sub = 0; | |
| 657 return(SDL_NextAudioFormat()); | |
| 658 } | |
| 659 | |
| 660 Uint16 SDL_NextAudioFormat(void) | |
| 661 { | |
| 662 if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { | |
| 663 return(0); | |
| 664 } | |
| 665 return(format_list[format_idx][format_idx_sub++]); | |
| 666 } | |
| 667 | |
| 668 void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) | |
| 669 { | |
| 670 switch (spec->format) { | |
| 671 case AUDIO_U8: | |
| 672 spec->silence = 0x80; | |
| 673 break; | |
| 674 default: | |
| 675 spec->silence = 0x00; | |
| 676 break; | |
| 677 } | |
| 678 spec->size = (spec->format&0xFF)/8; | |
| 679 spec->size *= spec->channels; | |
| 680 spec->size *= spec->samples; | |
| 681 } |