Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 1660:8b9d79e7eacf SDL-1.3
Added API requested in bug #43:
Added SDL_GetNumVideoDrivers() and SDL_GetVideoDriver().
Replaced SDL_VideoDriverName() with SDL_GetCurrentVideoDriver()
Added SDL_GetNumAudioDrivers() and SDL_GetAudioDriver().
Replaced SDL_AudioDriverName() with SDL_GetCurrentAudioDriver()
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 20 May 2006 04:35:58 +0000 |
| parents | 14717b52abc0 |
| children | 782fd950bd46 |
| 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 */ | |
| 1659 | 123 int SDLCALL SDL_RunAudio(void *audiop) |
| 0 | 124 { |
| 125 SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; | |
| 126 Uint8 *stream; | |
| 127 int stream_len; | |
| 128 void *udata; | |
| 1659 | 129 void (SDLCALL *fill)(void *userdata,Uint8 *stream, int len); |
| 0 | 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 |
| 1659 | 288 static Uint16 SDL_ParseAudioFormat(const char *string) |
| 289 { | |
| 290 Uint16 format = 0; | |
| 291 | |
| 292 switch (*string) { | |
| 293 case 'U': | |
| 294 ++string; | |
| 295 format |= 0x0000; | |
| 296 break; | |
| 297 case 'S': | |
| 298 ++string; | |
| 299 format |= 0x8000; | |
| 300 break; | |
| 301 default: | |
| 302 return 0; | |
| 303 } | |
| 304 switch (SDL_atoi(string)) { | |
| 305 case 8: | |
| 306 string += 1; | |
| 307 format |= 8; | |
| 308 break; | |
| 309 case 16: | |
| 310 string += 2; | |
| 311 format |= 16; | |
| 312 if ( SDL_strcmp(string, "LSB") == 0 | |
| 313 #if SDL_BYTEORDER == SDL_LIL_ENDIAN | |
| 314 || SDL_strcmp(string, "SYS") == 0 | |
| 315 #endif | |
| 316 ) { | |
| 317 format |= 0x0000; | |
| 318 } | |
| 319 if ( SDL_strcmp(string, "MSB") == 0 | |
| 320 #if SDL_BYTEORDER == SDL_BIG_ENDIAN | |
| 321 || SDL_strcmp(string, "SYS") == 0 | |
| 322 #endif | |
| 323 ) { | |
| 324 format |= 0x1000; | |
| 325 } | |
| 326 break; | |
| 327 default: | |
| 328 return 0; | |
| 329 } | |
| 330 return format; | |
| 331 } | |
| 332 | |
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333 int SDL_GetNumAudioDrivers(void) |
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334 { |
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335 return(SDL_arraysize(bootstrap)-1); |
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336 } |
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337 |
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338 const char *SDL_GetAudioDriver(int index) |
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339 { |
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340 if ( index >= 0 && index < SDL_GetNumAudioDrivers() ) { |
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341 return(bootstrap[index]->name); |
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342 } |
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343 return(NULL); |
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344 } |
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345 |
| 0 | 346 int SDL_AudioInit(const char *driver_name) |
| 347 { | |
| 348 SDL_AudioDevice *audio; | |
| 349 int i = 0, idx; | |
| 350 | |
| 351 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 352 if ( current_audio != NULL ) { | |
| 353 SDL_AudioQuit(); | |
| 354 } | |
| 355 | |
| 356 /* Select the proper audio driver */ | |
| 357 audio = NULL; | |
| 358 idx = 0; | |
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359 #if SDL_AUDIO_DRIVER_ESD |
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360 if ( (driver_name == NULL) && (SDL_getenv("ESPEAKER") != NULL) ) { |
| 0 | 361 /* Ahem, we know that if ESPEAKER is set, user probably wants |
| 362 to use ESD, but don't start it if it's not already running. | |
| 363 This probably isn't the place to do this, but... Shh! :) | |
| 364 */ | |
| 365 for ( i=0; bootstrap[i]; ++i ) { | |
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366 if ( SDL_strcmp(bootstrap[i]->name, "esd") == 0 ) { |
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367 #ifdef HAVE_PUTENV |
| 0 | 368 const char *esd_no_spawn; |
| 369 | |
| 370 /* Don't start ESD if it's not running */ | |
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371 esd_no_spawn = getenv("ESD_NO_SPAWN"); |
| 0 | 372 if ( esd_no_spawn == NULL ) { |
| 373 putenv("ESD_NO_SPAWN=1"); | |
| 374 } | |
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375 #endif |
| 0 | 376 if ( bootstrap[i]->available() ) { |
| 377 audio = bootstrap[i]->create(0); | |
| 378 break; | |
| 379 } | |
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380 #ifdef HAVE_UNSETENV |
| 0 | 381 if ( esd_no_spawn == NULL ) { |
| 382 unsetenv("ESD_NO_SPAWN"); | |
| 383 } | |
| 384 #endif | |
| 385 } | |
| 386 } | |
| 387 } | |
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388 #endif /* SDL_AUDIO_DRIVER_ESD */ |
| 0 | 389 if ( audio == NULL ) { |
| 390 if ( driver_name != NULL ) { | |
| 391 #if 0 /* This will be replaced with a better driver selection API */ | |
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392 if ( SDL_strrchr(driver_name, ':') != NULL ) { |
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393 idx = atoi(SDL_strrchr(driver_name, ':')+1); |
| 0 | 394 } |
| 395 #endif | |
| 396 for ( i=0; bootstrap[i]; ++i ) { | |
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397 if (SDL_strncmp(bootstrap[i]->name, driver_name, |
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398 SDL_strlen(bootstrap[i]->name)) == 0) { |
| 0 | 399 if ( bootstrap[i]->available() ) { |
| 400 audio=bootstrap[i]->create(idx); | |
| 401 break; | |
| 402 } | |
| 403 } | |
| 404 } | |
| 405 } else { | |
| 406 for ( i=0; bootstrap[i]; ++i ) { | |
| 407 if ( bootstrap[i]->available() ) { | |
| 408 audio = bootstrap[i]->create(idx); | |
| 409 if ( audio != NULL ) { | |
| 410 break; | |
| 411 } | |
| 412 } | |
| 413 } | |
| 414 } | |
| 415 if ( audio == NULL ) { | |
| 416 SDL_SetError("No available audio device"); | |
| 417 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 418 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 419 */ | |
| 420 return(-1); | |
| 421 #endif | |
| 422 } | |
| 423 } | |
| 424 current_audio = audio; | |
| 425 if ( current_audio ) { | |
| 426 current_audio->name = bootstrap[i]->name; | |
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427 if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
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428 current_audio->LockAudio = SDL_LockAudio_Default; |
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429 current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
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430 } |
| 0 | 431 } |
| 432 return(0); | |
| 433 } | |
| 434 | |
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435 const char *SDL_GetCurrentAudioDriver() |
| 0 | 436 { |
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437 if ( current_audio ) { |
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438 return current_audio->name; |
| 0 | 439 } |
| 440 return(NULL); | |
| 441 } | |
| 442 | |
| 443 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 444 { | |
| 445 SDL_AudioDevice *audio; | |
| 1659 | 446 const char *env; |
| 0 | 447 |
| 448 /* Start up the audio driver, if necessary */ | |
| 449 if ( ! current_audio ) { | |
| 450 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 451 (current_audio == NULL) ) { | |
| 452 return(-1); | |
| 453 } | |
| 454 } | |
| 455 audio = current_audio; | |
| 456 | |
|
262
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457 if (audio->opened) { |
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458 SDL_SetError("Audio device is already opened"); |
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459 return(-1); |
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460 } |
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461 |
| 0 | 462 /* Verify some parameters */ |
| 1659 | 463 if ( desired->freq == 0 ) { |
| 464 env = SDL_getenv("SDL_AUDIO_FREQUENCY"); | |
| 465 if ( env ) { | |
| 466 desired->freq = SDL_atoi(env); | |
| 467 } | |
| 468 } | |
| 469 if ( desired->freq == 0 ) { | |
| 470 /* Pick some default audio frequency */ | |
| 471 desired->freq = 22050; | |
| 472 } | |
| 473 if ( desired->format == 0 ) { | |
| 474 env = SDL_getenv("SDL_AUDIO_FORMAT"); | |
| 475 if ( env ) { | |
| 476 desired->format = SDL_ParseAudioFormat(env); | |
| 477 } | |
| 478 } | |
| 479 if ( desired->format == 0 ) { | |
| 480 /* Pick some default audio format */ | |
| 481 desired->format = AUDIO_S16; | |
| 482 } | |
| 483 if ( desired->channels == 0 ) { | |
| 484 env = SDL_getenv("SDL_AUDIO_CHANNELS"); | |
| 485 if ( env ) { | |
| 486 desired->channels = SDL_atoi(env); | |
| 487 } | |
| 488 } | |
| 489 if ( desired->channels == 0 ) { | |
| 490 /* Pick a default number of channels */ | |
| 491 desired->channels = 2; | |
| 0 | 492 } |
| 493 switch ( desired->channels ) { | |
| 494 case 1: /* Mono */ | |
| 495 case 2: /* Stereo */ | |
|
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496 case 4: /* surround */ |
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497 case 6: /* surround with center and lfe */ |
| 0 | 498 break; |
| 499 default: | |
| 500 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 501 return(-1); | |
| 502 } | |
| 1659 | 503 if ( desired->samples == 0 ) { |
| 504 env = SDL_getenv("SDL_AUDIO_SAMPLES"); | |
| 505 if ( env ) { | |
| 506 desired->samples = SDL_atoi(env); | |
| 507 } | |
| 508 } | |
| 509 if ( desired->samples == 0 ) { | |
| 510 /* Pick a default of ~46 ms at desired frequency */ | |
| 511 int samples = (desired->freq / 1000) * 46; | |
| 512 int power2 = 1; | |
| 513 while ( power2 < samples ) { | |
| 514 power2 *= 2; | |
| 515 } | |
| 516 desired->samples = power2; | |
| 517 } | |
| 518 if ( desired->callback == NULL ) { | |
| 519 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 520 return(-1); | |
| 521 } | |
| 0 | 522 |
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523 #if defined(__MACOS__) || (defined(__RISCOS__) && SDL_THREADS_DISABLED) |
| 0 | 524 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ |
| 525 #else | |
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526 #if defined(__MINT__) && SDL_THREADS_DISABLED |
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527 /* Uses interrupt driven audio, without thread */ |
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528 #else |
| 0 | 529 /* Create a semaphore for locking the sound buffers */ |
| 530 audio->mixer_lock = SDL_CreateMutex(); | |
| 531 if ( audio->mixer_lock == NULL ) { | |
| 532 SDL_SetError("Couldn't create mixer lock"); | |
| 533 SDL_CloseAudio(); | |
| 534 return(-1); | |
| 535 } | |
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536 #endif /* __MINT__ */ |
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537 #endif /* __MACOS__ */ |
| 0 | 538 |
| 539 /* Calculate the silence and size of the audio specification */ | |
| 540 SDL_CalculateAudioSpec(desired); | |
| 541 | |
| 542 /* Open the audio subsystem */ | |
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543 SDL_memcpy(&audio->spec, desired, sizeof(audio->spec)); |
| 0 | 544 audio->convert.needed = 0; |
| 545 audio->enabled = 1; | |
| 546 audio->paused = 1; | |
|
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547 |
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548 #if !SDL_AUDIO_DRIVER_AHI |
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549 |
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550 /* AmigaOS opens audio inside the main loop */ |
| 0 | 551 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
|
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552 |
| 0 | 553 if ( ! audio->opened ) { |
| 554 SDL_CloseAudio(); | |
| 555 return(-1); | |
| 556 } | |
|
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557 #else |
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558 D(bug("Locking semaphore...")); |
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559 SDL_mutexP(audio->mixer_lock); |
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560 |
|
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561 |
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562 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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563 D(bug("Created thread...\n")); |
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564 |
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565 if ( audio->thread == NULL ) { |
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566 SDL_mutexV(audio->mixer_lock); |
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567 SDL_CloseAudio(); |
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568 SDL_SetError("Couldn't create audio thread"); |
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569 return(-1); |
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570 } |
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571 |
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572 while(!audio_configured) |
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573 SDL_Delay(100); |
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574 #endif |
| 0 | 575 |
| 576 /* If the audio driver changes the buffer size, accept it */ | |
| 577 if ( audio->spec.samples != desired->samples ) { | |
| 578 desired->samples = audio->spec.samples; | |
| 579 SDL_CalculateAudioSpec(desired); | |
| 580 } | |
| 581 | |
| 582 /* Allocate a fake audio memory buffer */ | |
| 583 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 584 if ( audio->fake_stream == NULL ) { | |
| 585 SDL_CloseAudio(); | |
| 586 SDL_OutOfMemory(); | |
| 587 return(-1); | |
| 588 } | |
| 589 | |
| 590 /* See if we need to do any conversion */ | |
|
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591 if ( obtained != NULL ) { |
|
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592 SDL_memcpy(obtained, &audio->spec, sizeof(audio->spec)); |
|
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593 } else if ( desired->freq != audio->spec.freq || |
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594 desired->format != audio->spec.format || |
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595 desired->channels != audio->spec.channels ) { |
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596 /* Build an audio conversion block */ |
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597 if ( SDL_BuildAudioCVT(&audio->convert, |
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598 desired->format, desired->channels, |
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599 desired->freq, |
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600 audio->spec.format, audio->spec.channels, |
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601 audio->spec.freq) < 0 ) { |
|
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602 SDL_CloseAudio(); |
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603 return(-1); |
| 0 | 604 } |
|
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605 if ( audio->convert.needed ) { |
|
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606 audio->convert.len = desired->size; |
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607 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( |
|
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608 audio->convert.len*audio->convert.len_mult); |
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609 if ( audio->convert.buf == NULL ) { |
| 0 | 610 SDL_CloseAudio(); |
|
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611 SDL_OutOfMemory(); |
| 0 | 612 return(-1); |
| 613 } | |
| 614 } | |
| 615 } | |
| 616 | |
|
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617 #if !SDL_AUDIO_DRIVER_AHI |
| 0 | 618 /* Start the audio thread if necessary */ |
| 619 switch (audio->opened) { | |
| 620 case 1: | |
| 621 /* Start the audio thread */ | |
|
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622 #if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC) |
|
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623 #undef SDL_CreateThread |
|
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624 audio->thread = SDL_CreateThread(SDL_RunAudio, audio, NULL, NULL); |
|
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625 #else |
| 0 | 626 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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|
627 #endif |
| 0 | 628 if ( audio->thread == NULL ) { |
| 629 SDL_CloseAudio(); | |
| 630 SDL_SetError("Couldn't create audio thread"); | |
| 631 return(-1); | |
| 632 } | |
| 633 break; | |
| 634 | |
| 635 default: | |
| 636 /* The audio is now playing */ | |
| 637 break; | |
| 638 } | |
|
21
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639 #else |
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640 SDL_mutexV(audio->mixer_lock); |
|
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|
641 D(bug("SDL_OpenAudio USCITA...\n")); |
|
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642 |
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643 #endif |
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644 |
| 0 | 645 return(0); |
| 646 } | |
| 647 | |
| 648 SDL_audiostatus SDL_GetAudioStatus(void) | |
| 649 { | |
| 650 SDL_AudioDevice *audio = current_audio; | |
| 651 SDL_audiostatus status; | |
| 652 | |
| 653 status = SDL_AUDIO_STOPPED; | |
| 654 if ( audio && audio->enabled ) { | |
| 655 if ( audio->paused ) { | |
| 656 status = SDL_AUDIO_PAUSED; | |
| 657 } else { | |
| 658 status = SDL_AUDIO_PLAYING; | |
| 659 } | |
| 660 } | |
| 661 return(status); | |
| 662 } | |
| 663 | |
| 664 void SDL_PauseAudio (int pause_on) | |
| 665 { | |
| 666 SDL_AudioDevice *audio = current_audio; | |
| 667 | |
| 668 if ( audio ) { | |
| 669 audio->paused = pause_on; | |
| 670 } | |
| 671 } | |
| 672 | |
| 673 void SDL_LockAudio (void) | |
| 674 { | |
| 675 SDL_AudioDevice *audio = current_audio; | |
| 676 | |
| 677 /* Obtain a lock on the mixing buffers */ | |
|
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678 if ( audio && audio->LockAudio ) { |
|
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679 audio->LockAudio(audio); |
| 0 | 680 } |
| 681 } | |
| 682 | |
| 683 void SDL_UnlockAudio (void) | |
| 684 { | |
| 685 SDL_AudioDevice *audio = current_audio; | |
| 686 | |
| 687 /* Release lock on the mixing buffers */ | |
|
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688 if ( audio && audio->UnlockAudio ) { |
|
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689 audio->UnlockAudio(audio); |
| 0 | 690 } |
| 691 } | |
| 692 | |
| 693 void SDL_CloseAudio (void) | |
| 694 { | |
| 695 SDL_QuitSubSystem(SDL_INIT_AUDIO); | |
| 696 } | |
| 697 | |
| 698 void SDL_AudioQuit(void) | |
| 699 { | |
| 700 SDL_AudioDevice *audio = current_audio; | |
| 701 | |
| 702 if ( audio ) { | |
| 703 audio->enabled = 0; | |
| 704 if ( audio->thread != NULL ) { | |
| 705 SDL_WaitThread(audio->thread, NULL); | |
| 706 } | |
| 707 if ( audio->mixer_lock != NULL ) { | |
| 708 SDL_DestroyMutex(audio->mixer_lock); | |
| 709 } | |
| 710 if ( audio->fake_stream != NULL ) { | |
| 711 SDL_FreeAudioMem(audio->fake_stream); | |
| 712 } | |
| 713 if ( audio->convert.needed ) { | |
| 714 SDL_FreeAudioMem(audio->convert.buf); | |
|
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715 |
| 0 | 716 } |
|
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717 #if !SDL_AUDIO_DRIVER_AHI |
| 0 | 718 if ( audio->opened ) { |
| 719 audio->CloseAudio(audio); | |
| 720 audio->opened = 0; | |
| 721 } | |
|
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722 #endif |
| 0 | 723 /* Free the driver data */ |
| 724 audio->free(audio); | |
| 725 current_audio = NULL; | |
| 726 } | |
| 727 } | |
| 728 | |
| 729 #define NUM_FORMATS 6 | |
| 730 static int format_idx; | |
| 731 static int format_idx_sub; | |
| 732 static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { | |
| 733 { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 734 { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 735 { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 736 { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 737 { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 738 { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 739 }; | |
| 740 | |
| 741 Uint16 SDL_FirstAudioFormat(Uint16 format) | |
| 742 { | |
| 743 for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { | |
| 744 if ( format_list[format_idx][0] == format ) { | |
| 745 break; | |
| 746 } | |
| 747 } | |
| 748 format_idx_sub = 0; | |
| 749 return(SDL_NextAudioFormat()); | |
| 750 } | |
| 751 | |
| 752 Uint16 SDL_NextAudioFormat(void) | |
| 753 { | |
| 754 if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { | |
| 755 return(0); | |
| 756 } | |
| 757 return(format_list[format_idx][format_idx_sub++]); | |
| 758 } | |
| 759 | |
| 760 void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) | |
| 761 { | |
| 762 switch (spec->format) { | |
| 763 case AUDIO_U8: | |
| 764 spec->silence = 0x80; | |
| 765 break; | |
| 766 default: | |
| 767 spec->silence = 0x00; | |
| 768 break; | |
| 769 } | |
| 770 spec->size = (spec->format&0xFF)/8; | |
| 771 spec->size *= spec->channels; | |
| 772 spec->size *= spec->samples; | |
| 773 } |