Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audio.c @ 1555:780fd5b61df1
Fixed bug #89
Date: Sun, 23 Oct 2005 16:39:03 +0200
From: "A. Schmid" <sahib@phreaker.net>
Subject: [SDL] no software surfaces with svgalib driver?
Hi,
I noticed that the SDL (1.2.9) svgalib driver only makes use of linear
addressable (framebuffer) video modes. On older systems (like one of
mine), linear addressable modes are often not available.
Especially for cards with VESA VBE < 2.0 the svgalib vesa driver is
unusable, since VESA only supports framebuffering for VBE 2.0 and later.
The changes necessary to add support for software surfaces seem to be
relatively small. I only had to hack src/video/svga/SDL_svgavideo.c (see
attached patch). The code worked fine for me, but it is no more than a
proof of concept and should be reviewed (probably has a memory leak when
switching modes). It also uses the vgagl library (included in the
svgalib package) and needs to be linked against it.
-Alex
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 19 Mar 2006 12:05:16 +0000 |
| parents | 30f189cdd82b |
| children | c724c4a99759 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
|
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* Allow access to a raw mixing buffer */ | |
| 25 | |
| 26 #include "SDL.h" | |
| 27 #include "SDL_audio_c.h" | |
| 28 #include "SDL_audiomem.h" | |
| 29 #include "SDL_sysaudio.h" | |
| 30 | |
| 1190 | 31 #ifdef __OS2__ |
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32 /* We'll need the DosSetPriority() API! */ |
| 1190 | 33 #define INCL_DOSPROCESS |
| 34 #include <os2.h> | |
| 35 #endif | |
| 36 | |
| 0 | 37 /* Available audio drivers */ |
| 38 static AudioBootStrap *bootstrap[] = { | |
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39 #if SDL_AUDIO_DRIVER_OPENBSD |
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40 &OPENBSD_AUDIO_bootstrap, |
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41 #endif |
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42 #if SDL_AUDIO_DRIVER_OSS |
| 0 | 43 &DSP_bootstrap, |
| 44 &DMA_bootstrap, | |
| 45 #endif | |
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46 #if SDL_AUDIO_DRIVER_ALSA |
| 0 | 47 &ALSA_bootstrap, |
| 48 #endif | |
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49 #if SDL_AUDIO_DRIVER_QNXNTO |
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50 &QNXNTOAUDIO_bootstrap, |
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51 #endif |
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52 #if SDL_AUDIO_DRIVER_SUNAUDIO |
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53 &SUNAUDIO_bootstrap, |
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54 #endif |
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55 #if SDL_AUDIO_DRIVER_DMEDIA |
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56 &DMEDIA_bootstrap, |
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57 #endif |
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58 #if SDL_AUDIO_DRIVER_ARTS |
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59 &ARTS_bootstrap, |
| 0 | 60 #endif |
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61 #if SDL_AUDIO_DRIVER_ESD |
| 0 | 62 &ESD_bootstrap, |
| 63 #endif | |
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64 #if SDL_AUDIO_DRIVER_NAS |
| 0 | 65 &NAS_bootstrap, |
| 66 #endif | |
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67 #if SDL_AUDIO_DRIVER_DSOUND |
| 0 | 68 &DSOUND_bootstrap, |
| 69 #endif | |
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70 #if SDL_AUDIO_DRIVER_WAVEOUT |
| 0 | 71 &WAVEOUT_bootstrap, |
| 72 #endif | |
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73 #if SDL_AUDIO_DRIVER_PAUD |
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74 &Paud_bootstrap, |
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75 #endif |
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76 #if SDL_AUDIO_DRIVER_BAUDIO |
| 0 | 77 &BAUDIO_bootstrap, |
| 78 #endif | |
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79 #if SDL_AUDIO_DRIVER_COREAUDIO |
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80 &COREAUDIO_bootstrap, |
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81 #endif |
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82 #if SDL_AUDIO_DRIVER_SNDMGR |
| 0 | 83 &SNDMGR_bootstrap, |
| 84 #endif | |
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85 #if SDL_AUDIO_DRIVER_AHI |
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86 &AHI_bootstrap, |
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87 #endif |
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88 #if SDL_AUDIO_DRIVER_MINT |
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89 &MINTAUDIO_GSXB_bootstrap, |
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90 &MINTAUDIO_MCSN_bootstrap, |
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91 &MINTAUDIO_STFA_bootstrap, |
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92 &MINTAUDIO_XBIOS_bootstrap, |
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93 &MINTAUDIO_DMA8_bootstrap, |
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94 #endif |
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95 #if SDL_AUDIO_DRIVER_DISK |
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96 &DISKAUD_bootstrap, |
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97 #endif |
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98 #if SDL_AUDIO_DRIVER_DUMMY |
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99 &DUMMYAUD_bootstrap, |
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100 #endif |
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101 #if SDL_AUDIO_DRIVER_DC |
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102 &DCAUD_bootstrap, |
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103 #endif |
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104 #if SDL_AUDIO_DRIVER_MMEAUDIO |
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105 &MMEAUDIO_bootstrap, |
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106 #endif |
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107 #if SDL_AUDIO_DRIVER_DART |
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108 &DART_bootstrap, |
| 1190 | 109 #endif |
| 0 | 110 NULL |
| 111 }; | |
| 112 SDL_AudioDevice *current_audio = NULL; | |
| 113 | |
| 114 /* Various local functions */ | |
| 115 int SDL_AudioInit(const char *driver_name); | |
| 116 void SDL_AudioQuit(void); | |
| 117 | |
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118 #if SDL_AUDIO_DRIVER_AHI |
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119 static int audio_configured = 0; |
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120 #endif |
| 0 | 121 |
| 122 /* The general mixing thread function */ | |
| 123 int SDL_RunAudio(void *audiop) | |
| 124 { | |
| 125 SDL_AudioDevice *audio = (SDL_AudioDevice *)audiop; | |
| 126 Uint8 *stream; | |
| 127 int stream_len; | |
| 128 void *udata; | |
| 129 void (*fill)(void *userdata,Uint8 *stream, int len); | |
| 130 int silence; | |
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131 #if SDL_AUDIO_DRIVER_AHI |
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132 int started = 0; |
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133 |
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134 /* AmigaOS NEEDS that the audio driver is opened in the thread that uses it! */ |
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135 |
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136 D(bug("Task audio started audio struct:<%lx>...\n",audiop)); |
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137 |
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138 D(bug("Before Openaudio...")); |
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139 if(audio->OpenAudio(audio, &audio->spec)==-1) |
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140 { |
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141 D(bug("Open audio failed...\n")); |
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142 return(-1); |
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143 } |
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144 D(bug("OpenAudio...OK\n")); |
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145 #endif |
| 0 | 146 |
| 147 /* Perform any thread setup */ | |
| 148 if ( audio->ThreadInit ) { | |
| 149 audio->ThreadInit(audio); | |
| 150 } | |
| 151 audio->threadid = SDL_ThreadID(); | |
| 152 | |
| 153 /* Set up the mixing function */ | |
| 154 fill = audio->spec.callback; | |
| 155 udata = audio->spec.userdata; | |
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156 |
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157 #if SDL_AUDIO_DRIVER_AHI |
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158 audio_configured = 1; |
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159 |
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160 D(bug("Audio configured... Checking for conversion\n")); |
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161 SDL_mutexP(audio->mixer_lock); |
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162 D(bug("Semaphore obtained...\n")); |
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163 #endif |
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164 |
| 0 | 165 if ( audio->convert.needed ) { |
| 166 if ( audio->convert.src_format == AUDIO_U8 ) { | |
| 167 silence = 0x80; | |
| 168 } else { | |
| 169 silence = 0; | |
| 170 } | |
| 171 stream_len = audio->convert.len; | |
| 172 } else { | |
| 173 silence = audio->spec.silence; | |
| 174 stream_len = audio->spec.size; | |
| 175 } | |
| 176 stream = audio->fake_stream; | |
| 177 | |
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178 #if SDL_AUDIO_DRIVER_AHI |
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179 SDL_mutexV(audio->mixer_lock); |
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180 D(bug("Entering audio loop...\n")); |
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181 #endif |
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182 |
| 1190 | 183 #ifdef __OS2__ |
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184 /* Increase the priority of this thread to make sure that |
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185 the audio will be continuous all the time! */ |
| 1190 | 186 #ifdef USE_DOSSETPRIORITY |
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187 if (SDL_getenv("SDL_USE_TIMECRITICAL_AUDIO")) |
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188 { |
| 1190 | 189 #ifdef DEBUG_BUILD |
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190 printf("[SDL_RunAudio] : Setting priority to TimeCritical+0! (TID%d)\n", SDL_ThreadID()); |
| 1190 | 191 #endif |
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192 DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0); |
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193 } |
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194 else |
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195 { |
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196 #ifdef DEBUG_BUILD |
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197 printf("[SDL_RunAudio] : Setting priority to ForegroundServer+0! (TID%d)\n", SDL_ThreadID()); |
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198 #endif |
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199 DosSetPriority(PRTYS_THREAD, PRTYC_FOREGROUNDSERVER, 0, 0); |
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200 } |
| 1190 | 201 #endif |
| 202 #endif | |
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203 |
| 0 | 204 /* Loop, filling the audio buffers */ |
| 205 while ( audio->enabled ) { | |
| 206 | |
| 207 /* Wait for new current buffer to finish playing */ | |
| 208 if ( stream == audio->fake_stream ) { | |
| 209 SDL_Delay((audio->spec.samples*1000)/audio->spec.freq); | |
| 210 } else { | |
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211 #if SDL_AUDIO_DRIVER_AHI |
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212 if ( started > 1 ) |
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213 #endif |
| 0 | 214 audio->WaitAudio(audio); |
| 215 } | |
| 216 | |
| 217 /* Fill the current buffer with sound */ | |
| 218 if ( audio->convert.needed ) { | |
| 219 if ( audio->convert.buf ) { | |
| 220 stream = audio->convert.buf; | |
| 221 } else { | |
| 222 continue; | |
| 223 } | |
| 224 } else { | |
| 225 stream = audio->GetAudioBuf(audio); | |
| 226 if ( stream == NULL ) { | |
| 227 stream = audio->fake_stream; | |
| 228 } | |
| 229 } | |
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230 SDL_memset(stream, silence, stream_len); |
| 0 | 231 |
| 232 if ( ! audio->paused ) { | |
| 233 SDL_mutexP(audio->mixer_lock); | |
| 234 (*fill)(udata, stream, stream_len); | |
| 235 SDL_mutexV(audio->mixer_lock); | |
| 236 } | |
| 237 | |
| 238 /* Convert the audio if necessary */ | |
| 239 if ( audio->convert.needed ) { | |
| 240 SDL_ConvertAudio(&audio->convert); | |
| 241 stream = audio->GetAudioBuf(audio); | |
| 242 if ( stream == NULL ) { | |
| 243 stream = audio->fake_stream; | |
| 244 } | |
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245 SDL_memcpy(stream, audio->convert.buf, |
| 0 | 246 audio->convert.len_cvt); |
| 247 } | |
| 248 | |
| 249 /* Ready current buffer for play and change current buffer */ | |
| 250 if ( stream != audio->fake_stream ) { | |
| 251 audio->PlayAudio(audio); | |
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252 #if SDL_AUDIO_DRIVER_AHI |
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253 /* AmigaOS don't have to wait the first time audio is played! */ |
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254 started++; |
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255 #endif |
| 0 | 256 } |
| 257 } | |
| 258 /* Wait for the audio to drain.. */ | |
| 259 if ( audio->WaitDone ) { | |
| 260 audio->WaitDone(audio); | |
| 261 } | |
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262 |
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263 #if SDL_AUDIO_DRIVER_AHI |
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264 D(bug("WaitAudio...Done\n")); |
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265 |
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266 audio->CloseAudio(audio); |
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267 |
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268 D(bug("CloseAudio..Done, subtask exiting...\n")); |
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269 audio_configured = 0; |
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270 #endif |
| 1190 | 271 #ifdef __OS2__ |
| 272 #ifdef DEBUG_BUILD | |
| 273 printf("[SDL_RunAudio] : Task exiting. (TID%d)\n", SDL_ThreadID()); | |
| 274 #endif | |
| 275 #endif | |
| 0 | 276 return(0); |
| 277 } | |
| 278 | |
|
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279 static void SDL_LockAudio_Default(SDL_AudioDevice *audio) |
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280 { |
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281 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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282 return; |
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283 } |
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284 SDL_mutexP(audio->mixer_lock); |
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285 } |
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286 |
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287 static void SDL_UnlockAudio_Default(SDL_AudioDevice *audio) |
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288 { |
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289 if ( audio->thread && (SDL_ThreadID() == audio->threadid) ) { |
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290 return; |
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291 } |
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292 SDL_mutexV(audio->mixer_lock); |
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293 } |
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294 |
| 0 | 295 int SDL_AudioInit(const char *driver_name) |
| 296 { | |
| 297 SDL_AudioDevice *audio; | |
| 298 int i = 0, idx; | |
| 299 | |
| 300 /* Check to make sure we don't overwrite 'current_audio' */ | |
| 301 if ( current_audio != NULL ) { | |
| 302 SDL_AudioQuit(); | |
| 303 } | |
| 304 | |
| 305 /* Select the proper audio driver */ | |
| 306 audio = NULL; | |
| 307 idx = 0; | |
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308 #if SDL_AUDIO_DRIVER_ESD |
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309 if ( (driver_name == NULL) && (SDL_getenv("ESPEAKER") != NULL) ) { |
| 0 | 310 /* Ahem, we know that if ESPEAKER is set, user probably wants |
| 311 to use ESD, but don't start it if it's not already running. | |
| 312 This probably isn't the place to do this, but... Shh! :) | |
| 313 */ | |
| 314 for ( i=0; bootstrap[i]; ++i ) { | |
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315 if ( SDL_strcmp(bootstrap[i]->name, "esd") == 0 ) { |
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316 #ifdef HAVE_PUTENV |
| 0 | 317 const char *esd_no_spawn; |
| 318 | |
| 319 /* Don't start ESD if it's not running */ | |
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320 esd_no_spawn = getenv("ESD_NO_SPAWN"); |
| 0 | 321 if ( esd_no_spawn == NULL ) { |
| 322 putenv("ESD_NO_SPAWN=1"); | |
| 323 } | |
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324 #endif |
| 0 | 325 if ( bootstrap[i]->available() ) { |
| 326 audio = bootstrap[i]->create(0); | |
| 327 break; | |
| 328 } | |
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329 #ifdef HAVE_UNSETENV |
| 0 | 330 if ( esd_no_spawn == NULL ) { |
| 331 unsetenv("ESD_NO_SPAWN"); | |
| 332 } | |
| 333 #endif | |
| 334 } | |
| 335 } | |
| 336 } | |
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337 #endif /* SDL_AUDIO_DRIVER_ESD */ |
| 0 | 338 if ( audio == NULL ) { |
| 339 if ( driver_name != NULL ) { | |
| 340 #if 0 /* This will be replaced with a better driver selection API */ | |
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341 if ( SDL_strrchr(driver_name, ':') != NULL ) { |
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342 idx = atoi(SDL_strrchr(driver_name, ':')+1); |
| 0 | 343 } |
| 344 #endif | |
| 345 for ( i=0; bootstrap[i]; ++i ) { | |
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346 if (SDL_strncmp(bootstrap[i]->name, driver_name, |
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347 SDL_strlen(bootstrap[i]->name)) == 0) { |
| 0 | 348 if ( bootstrap[i]->available() ) { |
| 349 audio=bootstrap[i]->create(idx); | |
| 350 break; | |
| 351 } | |
| 352 } | |
| 353 } | |
| 354 } else { | |
| 355 for ( i=0; bootstrap[i]; ++i ) { | |
| 356 if ( bootstrap[i]->available() ) { | |
| 357 audio = bootstrap[i]->create(idx); | |
| 358 if ( audio != NULL ) { | |
| 359 break; | |
| 360 } | |
| 361 } | |
| 362 } | |
| 363 } | |
| 364 if ( audio == NULL ) { | |
| 365 SDL_SetError("No available audio device"); | |
| 366 #if 0 /* Don't fail SDL_Init() if audio isn't available. | |
| 367 SDL_OpenAudio() will handle it at that point. *sigh* | |
| 368 */ | |
| 369 return(-1); | |
| 370 #endif | |
| 371 } | |
| 372 } | |
| 373 current_audio = audio; | |
| 374 if ( current_audio ) { | |
| 375 current_audio->name = bootstrap[i]->name; | |
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376 if ( !current_audio->LockAudio && !current_audio->UnlockAudio ) { |
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377 current_audio->LockAudio = SDL_LockAudio_Default; |
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378 current_audio->UnlockAudio = SDL_UnlockAudio_Default; |
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379 } |
| 0 | 380 } |
| 381 return(0); | |
| 382 } | |
| 383 | |
| 384 char *SDL_AudioDriverName(char *namebuf, int maxlen) | |
| 385 { | |
| 386 if ( current_audio != NULL ) { | |
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387 SDL_strlcpy(namebuf, current_audio->name, maxlen); |
| 0 | 388 return(namebuf); |
| 389 } | |
| 390 return(NULL); | |
| 391 } | |
| 392 | |
| 393 int SDL_OpenAudio(SDL_AudioSpec *desired, SDL_AudioSpec *obtained) | |
| 394 { | |
| 395 SDL_AudioDevice *audio; | |
| 396 | |
| 397 /* Start up the audio driver, if necessary */ | |
| 398 if ( ! current_audio ) { | |
| 399 if ( (SDL_InitSubSystem(SDL_INIT_AUDIO) < 0) || | |
| 400 (current_audio == NULL) ) { | |
| 401 return(-1); | |
| 402 } | |
| 403 } | |
| 404 audio = current_audio; | |
| 405 | |
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406 if (audio->opened) { |
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407 SDL_SetError("Audio device is already opened"); |
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408 return(-1); |
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409 } |
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410 |
| 0 | 411 /* Verify some parameters */ |
| 412 if ( desired->callback == NULL ) { | |
| 413 SDL_SetError("SDL_OpenAudio() passed a NULL callback"); | |
| 414 return(-1); | |
| 415 } | |
| 416 switch ( desired->channels ) { | |
| 417 case 1: /* Mono */ | |
| 418 case 2: /* Stereo */ | |
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419 case 4: /* surround */ |
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420 case 6: /* surround with center and lfe */ |
| 0 | 421 break; |
| 422 default: | |
| 423 SDL_SetError("1 (mono) and 2 (stereo) channels supported"); | |
| 424 return(-1); | |
| 425 } | |
| 426 | |
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427 #if defined(__MACOS__) || (defined(__RISCOS__) && SDL_THREADS_DISABLED) |
| 0 | 428 /* FIXME: Need to implement PPC interrupt asm for SDL_LockAudio() */ |
| 429 #else | |
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430 #if defined(__MINT__) && SDL_THREADS_DISABLED |
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431 /* Uses interrupt driven audio, without thread */ |
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432 #else |
| 0 | 433 /* Create a semaphore for locking the sound buffers */ |
| 434 audio->mixer_lock = SDL_CreateMutex(); | |
| 435 if ( audio->mixer_lock == NULL ) { | |
| 436 SDL_SetError("Couldn't create mixer lock"); | |
| 437 SDL_CloseAudio(); | |
| 438 return(-1); | |
| 439 } | |
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440 #endif /* __MINT__ */ |
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441 #endif /* __MACOS__ */ |
| 0 | 442 |
| 443 /* Calculate the silence and size of the audio specification */ | |
| 444 SDL_CalculateAudioSpec(desired); | |
| 445 | |
| 446 /* Open the audio subsystem */ | |
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447 SDL_memcpy(&audio->spec, desired, sizeof(audio->spec)); |
| 0 | 448 audio->convert.needed = 0; |
| 449 audio->enabled = 1; | |
| 450 audio->paused = 1; | |
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451 |
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452 #if !SDL_AUDIO_DRIVER_AHI |
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453 |
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454 /* AmigaOS opens audio inside the main loop */ |
| 0 | 455 audio->opened = audio->OpenAudio(audio, &audio->spec)+1; |
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456 |
| 0 | 457 if ( ! audio->opened ) { |
| 458 SDL_CloseAudio(); | |
| 459 return(-1); | |
| 460 } | |
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461 #else |
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462 D(bug("Locking semaphore...")); |
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463 SDL_mutexP(audio->mixer_lock); |
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464 |
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465 |
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466 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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467 D(bug("Created thread...\n")); |
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468 |
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469 if ( audio->thread == NULL ) { |
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470 SDL_mutexV(audio->mixer_lock); |
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471 SDL_CloseAudio(); |
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472 SDL_SetError("Couldn't create audio thread"); |
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473 return(-1); |
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474 } |
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475 |
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476 while(!audio_configured) |
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477 SDL_Delay(100); |
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478 #endif |
| 0 | 479 |
| 480 /* If the audio driver changes the buffer size, accept it */ | |
| 481 if ( audio->spec.samples != desired->samples ) { | |
| 482 desired->samples = audio->spec.samples; | |
| 483 SDL_CalculateAudioSpec(desired); | |
| 484 } | |
| 485 | |
| 486 /* Allocate a fake audio memory buffer */ | |
| 487 audio->fake_stream = SDL_AllocAudioMem(audio->spec.size); | |
| 488 if ( audio->fake_stream == NULL ) { | |
| 489 SDL_CloseAudio(); | |
| 490 SDL_OutOfMemory(); | |
| 491 return(-1); | |
| 492 } | |
| 493 | |
| 494 /* See if we need to do any conversion */ | |
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495 if ( obtained != NULL ) { |
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496 SDL_memcpy(obtained, &audio->spec, sizeof(audio->spec)); |
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497 } else if ( desired->freq != audio->spec.freq || |
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498 desired->format != audio->spec.format || |
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499 desired->channels != audio->spec.channels ) { |
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500 /* Build an audio conversion block */ |
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501 if ( SDL_BuildAudioCVT(&audio->convert, |
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502 desired->format, desired->channels, |
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503 desired->freq, |
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504 audio->spec.format, audio->spec.channels, |
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505 audio->spec.freq) < 0 ) { |
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506 SDL_CloseAudio(); |
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507 return(-1); |
| 0 | 508 } |
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509 if ( audio->convert.needed ) { |
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510 audio->convert.len = desired->size; |
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511 audio->convert.buf =(Uint8 *)SDL_AllocAudioMem( |
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512 audio->convert.len*audio->convert.len_mult); |
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513 if ( audio->convert.buf == NULL ) { |
| 0 | 514 SDL_CloseAudio(); |
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515 SDL_OutOfMemory(); |
| 0 | 516 return(-1); |
| 517 } | |
| 518 } | |
| 519 } | |
| 520 | |
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521 #if !SDL_AUDIO_DRIVER_AHI |
| 0 | 522 /* Start the audio thread if necessary */ |
| 523 switch (audio->opened) { | |
| 524 case 1: | |
| 525 /* Start the audio thread */ | |
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526 #if (defined(__WIN32__) && !defined(_WIN32_WCE)) && !defined(HAVE_LIBC) |
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527 #undef SDL_CreateThread |
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528 audio->thread = SDL_CreateThread(SDL_RunAudio, audio, NULL, NULL); |
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529 #else |
| 0 | 530 audio->thread = SDL_CreateThread(SDL_RunAudio, audio); |
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531 #endif |
| 0 | 532 if ( audio->thread == NULL ) { |
| 533 SDL_CloseAudio(); | |
| 534 SDL_SetError("Couldn't create audio thread"); | |
| 535 return(-1); | |
| 536 } | |
| 537 break; | |
| 538 | |
| 539 default: | |
| 540 /* The audio is now playing */ | |
| 541 break; | |
| 542 } | |
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543 #else |
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544 SDL_mutexV(audio->mixer_lock); |
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545 D(bug("SDL_OpenAudio USCITA...\n")); |
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546 |
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547 #endif |
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548 |
| 0 | 549 return(0); |
| 550 } | |
| 551 | |
| 552 SDL_audiostatus SDL_GetAudioStatus(void) | |
| 553 { | |
| 554 SDL_AudioDevice *audio = current_audio; | |
| 555 SDL_audiostatus status; | |
| 556 | |
| 557 status = SDL_AUDIO_STOPPED; | |
| 558 if ( audio && audio->enabled ) { | |
| 559 if ( audio->paused ) { | |
| 560 status = SDL_AUDIO_PAUSED; | |
| 561 } else { | |
| 562 status = SDL_AUDIO_PLAYING; | |
| 563 } | |
| 564 } | |
| 565 return(status); | |
| 566 } | |
| 567 | |
| 568 void SDL_PauseAudio (int pause_on) | |
| 569 { | |
| 570 SDL_AudioDevice *audio = current_audio; | |
| 571 | |
| 572 if ( audio ) { | |
| 573 audio->paused = pause_on; | |
| 574 } | |
| 575 } | |
| 576 | |
| 577 void SDL_LockAudio (void) | |
| 578 { | |
| 579 SDL_AudioDevice *audio = current_audio; | |
| 580 | |
| 581 /* Obtain a lock on the mixing buffers */ | |
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582 if ( audio && audio->LockAudio ) { |
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583 audio->LockAudio(audio); |
| 0 | 584 } |
| 585 } | |
| 586 | |
| 587 void SDL_UnlockAudio (void) | |
| 588 { | |
| 589 SDL_AudioDevice *audio = current_audio; | |
| 590 | |
| 591 /* Release lock on the mixing buffers */ | |
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592 if ( audio && audio->UnlockAudio ) { |
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593 audio->UnlockAudio(audio); |
| 0 | 594 } |
| 595 } | |
| 596 | |
| 597 void SDL_CloseAudio (void) | |
| 598 { | |
| 599 SDL_QuitSubSystem(SDL_INIT_AUDIO); | |
| 600 } | |
| 601 | |
| 602 void SDL_AudioQuit(void) | |
| 603 { | |
| 604 SDL_AudioDevice *audio = current_audio; | |
| 605 | |
| 606 if ( audio ) { | |
| 607 audio->enabled = 0; | |
| 608 if ( audio->thread != NULL ) { | |
| 609 SDL_WaitThread(audio->thread, NULL); | |
| 610 } | |
| 611 if ( audio->mixer_lock != NULL ) { | |
| 612 SDL_DestroyMutex(audio->mixer_lock); | |
| 613 } | |
| 614 if ( audio->fake_stream != NULL ) { | |
| 615 SDL_FreeAudioMem(audio->fake_stream); | |
| 616 } | |
| 617 if ( audio->convert.needed ) { | |
| 618 SDL_FreeAudioMem(audio->convert.buf); | |
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619 |
| 0 | 620 } |
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621 #if !SDL_AUDIO_DRIVER_AHI |
| 0 | 622 if ( audio->opened ) { |
| 623 audio->CloseAudio(audio); | |
| 624 audio->opened = 0; | |
| 625 } | |
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626 #endif |
| 0 | 627 /* Free the driver data */ |
| 628 audio->free(audio); | |
| 629 current_audio = NULL; | |
| 630 } | |
| 631 } | |
| 632 | |
| 633 #define NUM_FORMATS 6 | |
| 634 static int format_idx; | |
| 635 static int format_idx_sub; | |
| 636 static Uint16 format_list[NUM_FORMATS][NUM_FORMATS] = { | |
| 637 { AUDIO_U8, AUDIO_S8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 638 { AUDIO_S8, AUDIO_U8, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB }, | |
| 639 { AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 640 { AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 641 { AUDIO_U16LSB, AUDIO_U16MSB, AUDIO_S16LSB, AUDIO_S16MSB, AUDIO_U8, AUDIO_S8 }, | |
| 642 { AUDIO_U16MSB, AUDIO_U16LSB, AUDIO_S16MSB, AUDIO_S16LSB, AUDIO_U8, AUDIO_S8 }, | |
| 643 }; | |
| 644 | |
| 645 Uint16 SDL_FirstAudioFormat(Uint16 format) | |
| 646 { | |
| 647 for ( format_idx=0; format_idx < NUM_FORMATS; ++format_idx ) { | |
| 648 if ( format_list[format_idx][0] == format ) { | |
| 649 break; | |
| 650 } | |
| 651 } | |
| 652 format_idx_sub = 0; | |
| 653 return(SDL_NextAudioFormat()); | |
| 654 } | |
| 655 | |
| 656 Uint16 SDL_NextAudioFormat(void) | |
| 657 { | |
| 658 if ( (format_idx == NUM_FORMATS) || (format_idx_sub == NUM_FORMATS) ) { | |
| 659 return(0); | |
| 660 } | |
| 661 return(format_list[format_idx][format_idx_sub++]); | |
| 662 } | |
| 663 | |
| 664 void SDL_CalculateAudioSpec(SDL_AudioSpec *spec) | |
| 665 { | |
| 666 switch (spec->format) { | |
| 667 case AUDIO_U8: | |
| 668 spec->silence = 0x80; | |
| 669 break; | |
| 670 default: | |
| 671 spec->silence = 0x00; | |
| 672 break; | |
| 673 } | |
| 674 spec->size = (spec->format&0xFF)/8; | |
| 675 spec->size *= spec->channels; | |
| 676 spec->size *= spec->samples; | |
| 677 } |