Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 3884:dba874934f0c SDL-1.2
Fix for buffer overflow in audio code, when feeding a device that needs
resampling.
Fixes Bugzilla #298.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Fri, 27 Oct 2006 20:18:24 +0000 |
| parents | c1b6bb5205f1 |
| children | 6d2e1961661a |
| 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_strcasecmp(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_strcasecmp(bootstrap[i]->name, driver_name) == 0) { |
| 0 | 385 if ( bootstrap[i]->available() ) { |
| 386 audio=bootstrap[i]->create(idx); | |
| 387 break; | |
| 388 } | |
| 389 } | |
| 390 } | |
| 391 } else { | |
| 392 for ( i=0; bootstrap[i]; ++i ) { | |
| 393 if ( bootstrap[i]->available() ) { | |
| 394 audio = bootstrap[i]->create(idx); | |
| 395 if ( audio != NULL ) { | |
| 396 break; | |
| 397 } | |
| 398 } | |
| 399 } | |
| 400 } | |
| 401 if ( audio == NULL ) { | |
| 402 SDL_SetError("No available audio device"); | |
| 403 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 404 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 405 */ | |
| 406 return(-1); | |
| 407 #endif | |
| 408 } | |
| 409 } | |
| 410 current_audio = audio; | |
| 411 if ( current_audio ) { | |
| 412 current_audio->name = bootstrap[i]->name; | |
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413 if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
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414 current_audio->LockAudio = SDL_LockAudio_Default; |
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415 current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
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416 } |
| 0 | 417 } |
| 418 return(0); | |
| 419 } | |
| 420 | |
| 421 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 422 { | |
| 423 if ( current_audio != NULL ) { | |
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424 SDL_strlcpy(namebuf, current_audio->name, maxlen); |
| 0 | 425 return(namebuf); |
| 426 } | |
| 427 return(NULL); | |
| 428 } | |
| 429 | |
| 430 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 431 { | |
| 432 SDL_AudioDevice *audio; | |
| 1794 | 433 const char *env; |
| 0 | 434 |
| 435 /* Start up the audio driver, if necessary */ | |
| 436 if ( ! current_audio ) { | |
| 437 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 438 (current_audio == NULL) ) { | |
| 439 return(-1); | |
| 440 } | |
| 441 } | |
| 442 audio = current_audio; | |
| 443 | |
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444 if (audio->opened) { |
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445 SDL_SetError("Audio device is already opened"); |
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446 return(-1); |
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447 } |
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448 |
| 0 | 449 /* Verify some parameters */ |
| 1794 | 450 if ( desired->freq == 0 ) { |
| 451 env = SDL_getenv("SDL_AUDIO_FREQUENCY"); | |
| 452 if ( env ) { | |
| 453 desired->freq = SDL_atoi(env); | |
| 454 } | |
| 455 } | |
| 456 if ( desired->freq == 0 ) { | |
| 457 /* Pick some default audio frequency */ | |
| 458 desired->freq = 22050; | |
| 459 } | |
| 460 if ( desired->format == 0 ) { | |
| 461 env = SDL_getenv("SDL_AUDIO_FORMAT"); | |
| 462 if ( env ) { | |
| 463 desired->format = SDL_ParseAudioFormat(env); | |
| 464 } | |
| 465 } | |
| 466 if ( desired->format == 0 ) { | |
| 467 /* Pick some default audio format */ | |
| 468 desired->format = AUDIO_S16; | |
| 469 } | |
| 470 if ( desired->channels == 0 ) { | |
| 471 env = SDL_getenv("SDL_AUDIO_CHANNELS"); | |
| 472 if ( env ) { | |
| 473 desired->channels = SDL_atoi(env); | |
| 474 } | |
| 475 } | |
| 476 if ( desired->channels == 0 ) { | |
| 477 /* Pick a default number of channels */ | |
| 478 desired->channels = 2; | |
| 0 | 479 } |
| 480 switch ( desired->channels ) { | |
| 481 case 1: /* Mono */ | |
| 482 case 2: /* Stereo */ | |
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483 case 4: /* surround */ |
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484 case 6: /* surround with center and lfe */ |
| 0 | 485 break; |
| 486 default: | |
| 487 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 488 return(-1); | |
| 489 } | |
| 1794 | 490 if ( desired->samples == 0 ) { |
| 491 env = SDL_getenv("SDL_AUDIO_SAMPLES"); | |
| 492 if ( env ) { | |
| 493 desired->samples = SDL_atoi(env); | |
| 494 } | |
| 495 } | |
| 496 if ( desired->samples == 0 ) { | |
| 497 /* Pick a default of ~46 ms at desired frequency */ | |
| 498 int samples = (desired->freq / 1000) * 46; | |
| 499 int power2 = 1; | |
| 500 while ( power2 < samples ) { | |
| 501 power2 *= 2; | |
| 502 } | |
| 503 desired->samples = power2; | |
| 504 } | |
| 505 if ( desired->callback == NULL ) { | |
| 506 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 507 return(-1); | |
| 508 } | |
| 0 | 509 |
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510 #if defined(__MACOS__) || (defined(__RISCOS__) && SDL_THREADS_DISABLED) |
| 0 | 511 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ |
| 512 #else | |
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513 #if defined(__MINT__) && SDL_THREADS_DISABLED |
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514 /* Uses interrupt driven audio, without thread */ |
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515 #else |
| 0 | 516 /* Create a semaphore for locking the sound buffers */ |
| 517 audio->mixer_lock = SDL_CreateMutex(); | |
| 518 if ( audio->mixer_lock == NULL ) { | |
| 519 SDL_SetError("Couldn't create mixer lock"); | |
| 520 SDL_CloseAudio(); | |
| 521 return(-1); | |
| 522 } | |
|
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523 #endif /* __MINT__ */ |
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524 #endif /* __MACOS__ */ |
| 0 | 525 |
| 526 /* Calculate the silence and size of the audio specification */ | |
| 527 SDL_CalculateAudioSpec(desired); | |
| 528 | |
| 529 /* Open the audio subsystem */ | |
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530 SDL_memcpy(&audio->spec, desired, sizeof(audio->spec)); |
| 0 | 531 audio->convert.needed = 0; |
| 532 audio->enabled = 1; | |
| 533 audio->paused = 1; | |
|
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534 |
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535 #if !SDL_AUDIO_DRIVER_AHI |
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536 |
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537 /* AmigaOS opens audio inside the main loop */ |
| 0 | 538 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
|
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539 |
| 0 | 540 if ( ! audio->opened ) { |
| 541 SDL_CloseAudio(); | |
| 542 return(-1); | |
| 543 } | |
|
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544 #else |
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545 D(bug("Locking semaphore...")); |
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546 SDL_mutexP(audio->mixer_lock); |
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547 |
|
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548 |
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549 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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550 D(bug("Created thread...\n")); |
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551 |
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552 if ( audio->thread == NULL ) { |
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553 SDL_mutexV(audio->mixer_lock); |
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554 SDL_CloseAudio(); |
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555 SDL_SetError("Couldn't create audio thread"); |
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556 return(-1); |
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557 } |
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558 |
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559 while(!audio_configured) |
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560 SDL_Delay(100); |
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561 #endif |
| 0 | 562 |
| 563 /* If the audio driver changes the buffer size, accept it */ | |
| 564 if ( audio->spec.samples != desired->samples ) { | |
| 565 desired->samples = audio->spec.samples; | |
| 566 SDL_CalculateAudioSpec(desired); | |
| 567 } | |
| 568 | |
| 569 /* Allocate a fake audio memory buffer */ | |
| 570 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 571 if ( audio->fake_stream == NULL ) { | |
| 572 SDL_CloseAudio(); | |
| 573 SDL_OutOfMemory(); | |
| 574 return(-1); | |
| 575 } | |
| 576 | |
| 577 /* See if we need to do any conversion */ | |
|
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578 if ( obtained != NULL ) { |
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579 SDL_memcpy(obtained, &audio->spec, sizeof(audio->spec)); |
|
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580 } else if ( desired->freq != audio->spec.freq || |
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581 desired->format != audio->spec.format || |
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582 desired->channels != audio->spec.channels ) { |
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583 /* Build an audio conversion block */ |
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584 if ( SDL_BuildAudioCVT(&audio->convert, |
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585 desired->format, desired->channels, |
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586 desired->freq, |
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587 audio->spec.format, audio->spec.channels, |
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588 audio->spec.freq) < 0 ) { |
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589 SDL_CloseAudio(); |
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590 return(-1); |
| 0 | 591 } |
|
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592 if ( audio->convert.needed ) { |
|
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593 audio->convert.len = (int) ( ((double) desired->size) / |
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594 audio->convert.len_ratio ); |
|
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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 } |