Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 1795:398ac0f88e4d
Fixed bug #220
The AltiVec blitters don't compile, since they require __VEC__ to be enabled in
order for the compiler to understand "vector" and friends (i.e. do AltiVec)
But you don't want to turn AltiVec on globally, since then the code would only
run on a G4 (there are already runtime tests, before using the AltiVec
variants)
The solution here is to enable AltiVec locally, for the actual AltiVec code.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 09 May 2006 15:09:47 +0000 |
| parents | 5605a9820134 |
| children | c121d94672cb c1b6bb5205f1 |
| 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 */ | |
| 1769 | 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; | |
| 1769 | 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 |
| 1794 | 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 | |
| 0 | 333 int SDL_AudioInit(const char *driver_name) |
| 334 { | |
| 335 SDL_AudioDevice *audio; | |
| 336 int i = 0, idx; | |
| 337 | |
| 338 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 339 if ( current_audio != NULL ) { | |
| 340 SDL_AudioQuit(); | |
| 341 } | |
| 342 | |
| 343 /* Select the proper audio driver */ | |
| 344 audio = NULL; | |
| 345 idx = 0; | |
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346 #if SDL_AUDIO_DRIVER_ESD |
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347 if ( (driver_name == NULL) && (SDL_getenv("ESPEAKER") != NULL) ) { |
| 0 | 348 /* Ahem, we know that if ESPEAKER is set, user probably wants |
| 349 to use ESD, but don't start it if it's not already running. | |
| 350 This probably isn't the place to do this, but... Shh! :) | |
| 351 */ | |
| 352 for ( i=0; bootstrap[i]; ++i ) { | |
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353 if ( SDL_strcmp(bootstrap[i]->name, "esd") == 0 ) { |
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354 #ifdef HAVE_PUTENV |
| 0 | 355 const char *esd_no_spawn; |
| 356 | |
| 357 /* Don't start ESD if it's not running */ | |
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358 esd_no_spawn = getenv("ESD_NO_SPAWN"); |
| 0 | 359 if ( esd_no_spawn == NULL ) { |
| 360 putenv("ESD_NO_SPAWN=1"); | |
| 361 } | |
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362 #endif |
| 0 | 363 if ( bootstrap[i]->available() ) { |
| 364 audio = bootstrap[i]->create(0); | |
| 365 break; | |
| 366 } | |
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367 #ifdef HAVE_UNSETENV |
| 0 | 368 if ( esd_no_spawn == NULL ) { |
| 369 unsetenv("ESD_NO_SPAWN"); | |
| 370 } | |
| 371 #endif | |
| 372 } | |
| 373 } | |
| 374 } | |
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375 #endif /* SDL_AUDIO_DRIVER_ESD */ |
| 0 | 376 if ( audio == NULL ) { |
| 377 if ( driver_name != NULL ) { | |
| 378 #if 0 /* This will be replaced with a better driver selection API */ | |
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379 if ( SDL_strrchr(driver_name, ':') != NULL ) { |
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380 idx = atoi(SDL_strrchr(driver_name, ':')+1); |
| 0 | 381 } |
| 382 #endif | |
| 383 for ( i=0; bootstrap[i]; ++i ) { | |
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384 if (SDL_strncmp(bootstrap[i]->name, driver_name, |
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385 SDL_strlen(bootstrap[i]->name)) == 0) { |
| 0 | 386 if ( bootstrap[i]->available() ) { |
| 387 audio=bootstrap[i]->create(idx); | |
| 388 break; | |
| 389 } | |
| 390 } | |
| 391 } | |
| 392 } else { | |
| 393 for ( i=0; bootstrap[i]; ++i ) { | |
| 394 if ( bootstrap[i]->available() ) { | |
| 395 audio = bootstrap[i]->create(idx); | |
| 396 if ( audio != NULL ) { | |
| 397 break; | |
| 398 } | |
| 399 } | |
| 400 } | |
| 401 } | |
| 402 if ( audio == NULL ) { | |
| 403 SDL_SetError("No available audio device"); | |
| 404 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 405 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 406 */ | |
| 407 return(-1); | |
| 408 #endif | |
| 409 } | |
| 410 } | |
| 411 current_audio = audio; | |
| 412 if ( current_audio ) { | |
| 413 current_audio->name = bootstrap[i]->name; | |
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414 if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
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415 current_audio->LockAudio = SDL_LockAudio_Default; |
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416 current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
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417 } |
| 0 | 418 } |
| 419 return(0); | |
| 420 } | |
| 421 | |
| 422 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 423 { | |
| 424 if ( current_audio != NULL ) { | |
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425 SDL_strlcpy(namebuf, current_audio->name, maxlen); |
| 0 | 426 return(namebuf); |
| 427 } | |
| 428 return(NULL); | |
| 429 } | |
| 430 | |
| 431 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 432 { | |
| 433 SDL_AudioDevice *audio; | |
| 1794 | 434 const char *env; |
| 0 | 435 |
| 436 /* Start up the audio driver, if necessary */ | |
| 437 if ( ! current_audio ) { | |
| 438 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 439 (current_audio == NULL) ) { | |
| 440 return(-1); | |
| 441 } | |
| 442 } | |
| 443 audio = current_audio; | |
| 444 | |
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445 if (audio->opened) { |
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446 SDL_SetError("Audio device is already opened"); |
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447 return(-1); |
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448 } |
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449 |
| 0 | 450 /* Verify some parameters */ |
| 1794 | 451 if ( desired->freq == 0 ) { |
| 452 env = SDL_getenv("SDL_AUDIO_FREQUENCY"); | |
| 453 if ( env ) { | |
| 454 desired->freq = SDL_atoi(env); | |
| 455 } | |
| 456 } | |
| 457 if ( desired->freq == 0 ) { | |
| 458 /* Pick some default audio frequency */ | |
| 459 desired->freq = 22050; | |
| 460 } | |
| 461 if ( desired->format == 0 ) { | |
| 462 env = SDL_getenv("SDL_AUDIO_FORMAT"); | |
| 463 if ( env ) { | |
| 464 desired->format = SDL_ParseAudioFormat(env); | |
| 465 } | |
| 466 } | |
| 467 if ( desired->format == 0 ) { | |
| 468 /* Pick some default audio format */ | |
| 469 desired->format = AUDIO_S16; | |
| 470 } | |
| 471 if ( desired->channels == 0 ) { | |
| 472 env = SDL_getenv("SDL_AUDIO_CHANNELS"); | |
| 473 if ( env ) { | |
| 474 desired->channels = SDL_atoi(env); | |
| 475 } | |
| 476 } | |
| 477 if ( desired->channels == 0 ) { | |
| 478 /* Pick a default number of channels */ | |
| 479 desired->channels = 2; | |
| 0 | 480 } |
| 481 switch ( desired->channels ) { | |
| 482 case 1: /* Mono */ | |
| 483 case 2: /* Stereo */ | |
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484 case 4: /* surround */ |
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485 case 6: /* surround with center and lfe */ |
| 0 | 486 break; |
| 487 default: | |
| 488 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 489 return(-1); | |
| 490 } | |
| 1794 | 491 if ( desired->samples == 0 ) { |
| 492 env = SDL_getenv("SDL_AUDIO_SAMPLES"); | |
| 493 if ( env ) { | |
| 494 desired->samples = SDL_atoi(env); | |
| 495 } | |
| 496 } | |
| 497 if ( desired->samples == 0 ) { | |
| 498 /* Pick a default of ~46 ms at desired frequency */ | |
| 499 int samples = (desired->freq / 1000) * 46; | |
| 500 int power2 = 1; | |
| 501 while ( power2 < samples ) { | |
| 502 power2 *= 2; | |
| 503 } | |
| 504 desired->samples = power2; | |
| 505 } | |
| 506 if ( desired->callback == NULL ) { | |
| 507 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 508 return(-1); | |
| 509 } | |
| 0 | 510 |
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511 #if defined(__MACOS__) || (defined(__RISCOS__) && SDL_THREADS_DISABLED) |
| 0 | 512 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ |
| 513 #else | |
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514 #if defined(__MINT__) && SDL_THREADS_DISABLED |
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515 /* Uses interrupt driven audio, without thread */ |
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516 #else |
| 0 | 517 /* Create a semaphore for locking the sound buffers */ |
| 518 audio->mixer_lock = SDL_CreateMutex(); | |
| 519 if ( audio->mixer_lock == NULL ) { | |
| 520 SDL_SetError("Couldn't create mixer lock"); | |
| 521 SDL_CloseAudio(); | |
| 522 return(-1); | |
| 523 } | |
|
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524 #endif /* __MINT__ */ |
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525 #endif /* __MACOS__ */ |
| 0 | 526 |
| 527 /* Calculate the silence and size of the audio specification */ | |
| 528 SDL_CalculateAudioSpec(desired); | |
| 529 | |
| 530 /* Open the audio subsystem */ | |
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531 SDL_memcpy(&audio->spec, desired, sizeof(audio->spec)); |
| 0 | 532 audio->convert.needed = 0; |
| 533 audio->enabled = 1; | |
| 534 audio->paused = 1; | |
|
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535 |
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536 #if !SDL_AUDIO_DRIVER_AHI |
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537 |
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538 /* AmigaOS opens audio inside the main loop */ |
| 0 | 539 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
|
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540 |
| 0 | 541 if ( ! audio->opened ) { |
| 542 SDL_CloseAudio(); | |
| 543 return(-1); | |
| 544 } | |
|
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545 #else |
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546 D(bug("Locking semaphore...")); |
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547 SDL_mutexP(audio->mixer_lock); |
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548 |
|
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549 |
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550 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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551 D(bug("Created thread...\n")); |
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552 |
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553 if ( audio->thread == NULL ) { |
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554 SDL_mutexV(audio->mixer_lock); |
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555 SDL_CloseAudio(); |
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556 SDL_SetError("Couldn't create audio thread"); |
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557 return(-1); |
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558 } |
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559 |
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560 while(!audio_configured) |
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561 SDL_Delay(100); |
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562 #endif |
| 0 | 563 |
| 564 /* If the audio driver changes the buffer size, accept it */ | |
| 565 if ( audio->spec.samples != desired->samples ) { | |
| 566 desired->samples = audio->spec.samples; | |
| 567 SDL_CalculateAudioSpec(desired); | |
| 568 } | |
| 569 | |
| 570 /* Allocate a fake audio memory buffer */ | |
| 571 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 572 if ( audio->fake_stream == NULL ) { | |
| 573 SDL_CloseAudio(); | |
| 574 SDL_OutOfMemory(); | |
| 575 return(-1); | |
| 576 } | |
| 577 | |
| 578 /* See if we need to do any conversion */ | |
|
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579 if ( obtained != NULL ) { |
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580 SDL_memcpy(obtained, &audio->spec, sizeof(audio->spec)); |
|
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581 } else if ( desired->freq != audio->spec.freq || |
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582 desired->format != audio->spec.format || |
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583 desired->channels != audio->spec.channels ) { |
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584 /* Build an audio conversion block */ |
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585 if ( SDL_BuildAudioCVT(&audio->convert, |
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586 desired->format, desired->channels, |
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587 desired->freq, |
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588 audio->spec.format, audio->spec.channels, |
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589 audio->spec.freq) < 0 ) { |
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590 SDL_CloseAudio(); |
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591 return(-1); |
| 0 | 592 } |
|
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593 if ( audio->convert.needed ) { |
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594 audio->convert.len = desired->size; |
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595 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( |
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596 audio->convert.len*audio->convert.len_mult); |
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597 if ( audio->convert.buf == NULL ) { |
| 0 | 598 SDL_CloseAudio(); |
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599 SDL_OutOfMemory(); |
| 0 | 600 return(-1); |
| 601 } | |
| 602 } | |
| 603 } | |
| 604 | |
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605 #if !SDL_AUDIO_DRIVER_AHI |
| 0 | 606 /* Start the audio thread if necessary */ |
| 607 switch (audio->opened) { | |
| 608 case 1: | |
| 609 /* Start the audio thread */ | |
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610 #if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC) |
|
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611 #undef SDL_CreateThread |
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612 audio->thread = SDL_CreateThread(SDL_RunAudio, audio, NULL, NULL); |
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613 #else |
| 0 | 614 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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615 #endif |
| 0 | 616 if ( audio->thread == NULL ) { |
| 617 SDL_CloseAudio(); | |
| 618 SDL_SetError("Couldn't create audio thread"); | |
| 619 return(-1); | |
| 620 } | |
| 621 break; | |
| 622 | |
| 623 default: | |
| 624 /* The audio is now playing */ | |
| 625 break; | |
| 626 } | |
|
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627 #else |
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628 SDL_mutexV(audio->mixer_lock); |
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629 D(bug("SDL_OpenAudio USCITA...\n")); |
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630 |
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631 #endif |
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632 |
| 0 | 633 return(0); |
| 634 } | |
| 635 | |
| 636 SDL_audiostatus SDL_GetAudioStatus(void) | |
| 637 { | |
| 638 SDL_AudioDevice *audio = current_audio; | |
| 639 SDL_audiostatus status; | |
| 640 | |
| 641 status = SDL_AUDIO_STOPPED; | |
| 642 if ( audio && audio->enabled ) { | |
| 643 if ( audio->paused ) { | |
| 644 status = SDL_AUDIO_PAUSED; | |
| 645 } else { | |
| 646 status = SDL_AUDIO_PLAYING; | |
| 647 } | |
| 648 } | |
| 649 return(status); | |
| 650 } | |
| 651 | |
| 652 void SDL_PauseAudio (int pause_on) | |
| 653 { | |
| 654 SDL_AudioDevice *audio = current_audio; | |
| 655 | |
| 656 if ( audio ) { | |
| 657 audio->paused = pause_on; | |
| 658 } | |
| 659 } | |
| 660 | |
| 661 void SDL_LockAudio (void) | |
| 662 { | |
| 663 SDL_AudioDevice *audio = current_audio; | |
| 664 | |
| 665 /* Obtain a lock on the mixing buffers */ | |
|
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666 if ( audio && audio->LockAudio ) { |
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667 audio->LockAudio(audio); |
| 0 | 668 } |
| 669 } | |
| 670 | |
| 671 void SDL_UnlockAudio (void) | |
| 672 { | |
| 673 SDL_AudioDevice *audio = current_audio; | |
| 674 | |
| 675 /* Release lock on the mixing buffers */ | |
|
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676 if ( audio && audio->UnlockAudio ) { |
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677 audio->UnlockAudio(audio); |
| 0 | 678 } |
| 679 } | |
| 680 | |
| 681 void SDL_CloseAudio (void) | |
| 682 { | |
| 683 SDL_QuitSubSystem(SDL_INIT_AUDIO); | |
| 684 } | |
| 685 | |
| 686 void SDL_AudioQuit(void) | |
| 687 { | |
| 688 SDL_AudioDevice *audio = current_audio; | |
| 689 | |
| 690 if ( audio ) { | |
| 691 audio->enabled = 0; | |
| 692 if ( audio->thread != NULL ) { | |
| 693 SDL_WaitThread(audio->thread, NULL); | |
| 694 } | |
| 695 if ( audio->mixer_lock != NULL ) { | |
| 696 SDL_DestroyMutex(audio->mixer_lock); | |
| 697 } | |
| 698 if ( audio->fake_stream != NULL ) { | |
| 699 SDL_FreeAudioMem(audio->fake_stream); | |
| 700 } | |
| 701 if ( audio->convert.needed ) { | |
| 702 SDL_FreeAudioMem(audio->convert.buf); | |
|
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703 |
| 0 | 704 } |
|
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705 #if !SDL_AUDIO_DRIVER_AHI |
| 0 | 706 if ( audio->opened ) { |
| 707 audio->CloseAudio(audio); | |
| 708 audio->opened = 0; | |
| 709 } | |
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710 #endif |
| 0 | 711 /* Free the driver data */ |
| 712 audio->free(audio); | |
| 713 current_audio = NULL; | |
| 714 } | |
| 715 } | |
| 716 | |
| 717 #define NUM_FORMATS 6 | |
| 718 static int format_idx; | |
| 719 static int format_idx_sub; | |
| 720 static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { | |
| 721 { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 722 { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 723 { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 724 { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 725 { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 726 { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 727 }; | |
| 728 | |
| 729 Uint16 SDL_FirstAudioFormat(Uint16 format) | |
| 730 { | |
| 731 for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { | |
| 732 if ( format_list[format_idx][0] == format ) { | |
| 733 break; | |
| 734 } | |
| 735 } | |
| 736 format_idx_sub = 0; | |
| 737 return(SDL_NextAudioFormat()); | |
| 738 } | |
| 739 | |
| 740 Uint16 SDL_NextAudioFormat(void) | |
| 741 { | |
| 742 if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { | |
| 743 return(0); | |
| 744 } | |
| 745 return(format_list[format_idx][format_idx_sub++]); | |
| 746 } | |
| 747 | |
| 748 void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) | |
| 749 { | |
| 750 switch (spec->format) { | |
| 751 case AUDIO_U8: | |
| 752 spec->silence = 0x80; | |
| 753 break; | |
| 754 default: | |
| 755 spec->silence = 0x00; | |
| 756 break; | |
| 757 } | |
| 758 spec->size = (spec->format&0xFF)/8; | |
| 759 spec->size *= spec->channels; | |
| 760 spec->size *= spec->samples; | |
| 761 } |