Mercurial > sdl-ios-xcode
annotate src/audio/esd/SDL_esdaudio.c @ 3848:4de14c915f4c SDL-1.2
Updated the snapshot build target to reflect the new source location
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 10 Jul 2006 21:23:11 +0000 |
| parents | 9f836cec0521 |
| children | 782fd950bd46 c121d94672cb a1b03ba2fcd0 |
| 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 an ESD network stream mixing buffer */ | |
| 25 | |
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26 #include <sys/types.h> |
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27 #include <unistd.h> |
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28 #include <signal.h> |
| 0 | 29 #include <errno.h> |
| 30 #include <esd.h> | |
| 31 | |
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32 #include "SDL_timer.h" |
| 0 | 33 #include "SDL_audio.h" |
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34 #include "../SDL_audiomem.h" |
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35 #include "../SDL_audio_c.h" |
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36 #include "../SDL_audiodev_c.h" |
| 0 | 37 #include "SDL_esdaudio.h" |
| 38 | |
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39 #ifdef SDL_AUDIO_DRIVER_ESD_DYNAMIC |
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40 #include "SDL_name.h" |
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41 #include "SDL_loadso.h" |
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42 #else |
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43 #define SDL_NAME(X) X |
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44 #endif |
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45 |
| 0 | 46 /* The tag name used by ESD audio */ |
| 47 #define ESD_DRIVER_NAME "esd" | |
| 48 | |
| 49 /* Audio driver functions */ | |
| 50 static int ESD_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 51 static void ESD_WaitAudio(_THIS); | |
| 52 static void ESD_PlayAudio(_THIS); | |
| 53 static Uint8 *ESD_GetAudioBuf(_THIS); | |
| 54 static void ESD_CloseAudio(_THIS); | |
| 55 | |
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56 #ifdef SDL_AUDIO_DRIVER_ESD_DYNAMIC |
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57 |
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58 static const char *esd_library = SDL_AUDIO_DRIVER_ESD_DYNAMIC; |
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59 static void *esd_handle = NULL; |
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60 static int esd_loaded = 0; |
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61 |
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62 static int (*SDL_NAME(esd_open_sound))( const char *host ); |
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63 static int (*SDL_NAME(esd_close))( int esd ); |
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64 static int (*SDL_NAME(esd_play_stream))( esd_format_t format, int rate, |
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65 const char *host, const char *name ); |
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66 static struct { |
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67 const char *name; |
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68 void **func; |
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69 } esd_functions[] = { |
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70 { "esd_open_sound", (void **)&SDL_NAME(esd_open_sound) }, |
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71 { "esd_close", (void **)&SDL_NAME(esd_close) }, |
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72 { "esd_play_stream", (void **)&SDL_NAME(esd_play_stream) }, |
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73 }; |
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74 |
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75 static void UnloadESDLibrary() |
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76 { |
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77 if ( esd_loaded ) { |
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78 SDL_UnloadObject(esd_handle); |
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79 esd_handle = NULL; |
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80 esd_loaded = 0; |
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81 } |
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82 } |
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83 |
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84 static int LoadESDLibrary(void) |
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85 { |
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86 int i, retval = -1; |
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87 |
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88 esd_handle = SDL_LoadObject(esd_library); |
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89 if ( esd_handle ) { |
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90 esd_loaded = 1; |
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91 retval = 0; |
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92 for ( i=0; i<SDL_arraysize(esd_functions); ++i ) { |
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93 *esd_functions[i].func = SDL_LoadFunction(esd_handle, esd_functions[i].name); |
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94 if ( !*esd_functions[i].func ) { |
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95 retval = -1; |
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96 UnloadESDLibrary(); |
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97 break; |
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98 } |
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99 } |
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100 } |
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101 return retval; |
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102 } |
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103 |
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104 #else |
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105 |
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106 static void UnloadESDLibrary() |
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107 { |
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108 return; |
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109 } |
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110 |
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111 static int LoadESDLibrary(void) |
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112 { |
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113 return 0; |
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114 } |
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115 |
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116 #endif /* SDL_AUDIO_DRIVER_ESD_DYNAMIC */ |
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117 |
| 0 | 118 /* Audio driver bootstrap functions */ |
| 119 | |
| 120 static int Audio_Available(void) | |
| 121 { | |
| 122 int connection; | |
| 123 int available; | |
| 124 | |
| 125 available = 0; | |
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126 if ( LoadESDLibrary() < 0 ) { |
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127 return available; |
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128 } |
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129 connection = SDL_NAME(esd_open_sound)(NULL); |
| 0 | 130 if ( connection >= 0 ) { |
| 131 available = 1; | |
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132 SDL_NAME(esd_close)(connection); |
| 0 | 133 } |
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134 UnloadESDLibrary(); |
| 0 | 135 return(available); |
| 136 } | |
| 137 | |
| 138 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 139 { | |
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140 SDL_free(device->hidden); |
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141 SDL_free(device); |
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142 UnloadESDLibrary(); |
| 0 | 143 } |
| 144 | |
| 145 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 146 { | |
| 147 SDL_AudioDevice *this; | |
| 148 | |
| 149 /* Initialize all variables that we clean on shutdown */ | |
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150 LoadESDLibrary(); |
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151 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 0 | 152 if ( this ) { |
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153 SDL_memset(this, 0, (sizeof *this)); |
| 0 | 154 this->hidden = (struct SDL_PrivateAudioData *) |
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155 SDL_malloc((sizeof *this->hidden)); |
| 0 | 156 } |
| 157 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 158 SDL_OutOfMemory(); | |
| 159 if ( this ) { | |
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160 SDL_free(this); |
| 0 | 161 } |
| 162 return(0); | |
| 163 } | |
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164 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| 0 | 165 audio_fd = -1; |
| 166 | |
| 167 /* Set the function pointers */ | |
| 168 this->OpenAudio = ESD_OpenAudio; | |
| 169 this->WaitAudio = ESD_WaitAudio; | |
| 170 this->PlayAudio = ESD_PlayAudio; | |
| 171 this->GetAudioBuf = ESD_GetAudioBuf; | |
| 172 this->CloseAudio = ESD_CloseAudio; | |
| 173 | |
| 174 this->free = Audio_DeleteDevice; | |
| 175 | |
| 176 return this; | |
| 177 } | |
| 178 | |
| 179 AudioBootStrap ESD_bootstrap = { | |
| 180 ESD_DRIVER_NAME, "Enlightened Sound Daemon", | |
| 181 Audio_Available, Audio_CreateDevice | |
| 182 }; | |
| 183 | |
| 184 /* This function waits until it is possible to write a full sound buffer */ | |
| 185 static void ESD_WaitAudio(_THIS) | |
| 186 { | |
| 187 Sint32 ticks; | |
| 188 | |
| 189 /* Check to see if the thread-parent process is still alive */ | |
| 190 { static int cnt = 0; | |
| 191 /* Note that this only works with thread implementations | |
| 192 that use a different process id for each thread. | |
| 193 */ | |
| 194 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */ | |
| 195 if ( kill(parent, 0) < 0 ) { | |
| 196 this->enabled = 0; | |
| 197 } | |
| 198 } | |
| 199 } | |
| 200 | |
| 201 /* Use timer for general audio synchronization */ | |
| 202 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS; | |
| 203 if ( ticks > 0 ) { | |
| 204 SDL_Delay(ticks); | |
| 205 } | |
| 206 } | |
| 207 | |
| 208 static void ESD_PlayAudio(_THIS) | |
| 209 { | |
| 210 int written; | |
| 211 | |
| 212 /* Write the audio data, checking for EAGAIN on broken audio drivers */ | |
| 213 do { | |
| 214 written = write(audio_fd, mixbuf, mixlen); | |
| 215 if ( (written < 0) && ((errno == 0) || (errno == EAGAIN)) ) { | |
| 216 SDL_Delay(1); /* Let a little CPU time go by */ | |
| 217 } | |
| 218 } while ( (written < 0) && | |
| 219 ((errno == 0) || (errno == EAGAIN) || (errno == EINTR)) ); | |
| 220 | |
| 221 /* Set the next write frame */ | |
| 222 next_frame += frame_ticks; | |
| 223 | |
| 224 /* If we couldn't write, assume fatal error for now */ | |
| 225 if ( written < 0 ) { | |
| 226 this->enabled = 0; | |
| 227 } | |
| 228 } | |
| 229 | |
| 230 static Uint8 *ESD_GetAudioBuf(_THIS) | |
| 231 { | |
| 232 return(mixbuf); | |
| 233 } | |
| 234 | |
| 235 static void ESD_CloseAudio(_THIS) | |
| 236 { | |
| 237 if ( mixbuf != NULL ) { | |
| 238 SDL_FreeAudioMem(mixbuf); | |
| 239 mixbuf = NULL; | |
| 240 } | |
| 241 if ( audio_fd >= 0 ) { | |
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242 SDL_NAME(esd_close)(audio_fd); |
| 0 | 243 audio_fd = -1; |
| 244 } | |
| 245 } | |
| 246 | |
| 247 /* Try to get the name of the program */ | |
| 248 static char *get_progname(void) | |
| 249 { | |
| 250 char *progname = NULL; | |
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251 #ifdef __LINUX__ |
| 0 | 252 FILE *fp; |
| 253 static char temp[BUFSIZ]; | |
| 254 | |
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255 SDL_snprintf(temp, SDL_arraysize(temp), "/proc/%d/cmdline", getpid()); |
| 0 | 256 fp = fopen(temp, "r"); |
| 257 if ( fp != NULL ) { | |
| 258 if ( fgets(temp, sizeof(temp)-1, fp) ) { | |
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259 progname = SDL_strrchr(temp, '/'); |
| 0 | 260 if ( progname == NULL ) { |
| 261 progname = temp; | |
| 262 } else { | |
| 263 progname = progname+1; | |
| 264 } | |
| 265 } | |
| 266 fclose(fp); | |
| 267 } | |
| 268 #endif | |
| 269 return(progname); | |
| 270 } | |
| 271 | |
| 272 static int ESD_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 273 { | |
| 274 esd_format_t format; | |
| 275 | |
| 276 /* Convert audio spec to the ESD audio format */ | |
| 277 format = (ESD_STREAM | ESD_PLAY); | |
| 278 switch ( spec->format & 0xFF ) { | |
| 279 case 8: | |
| 280 format |= ESD_BITS8; | |
| 281 break; | |
| 282 case 16: | |
| 283 format |= ESD_BITS16; | |
| 284 break; | |
| 285 default: | |
| 286 SDL_SetError("Unsupported ESD audio format"); | |
| 287 return(-1); | |
| 288 } | |
| 289 if ( spec->channels == 1 ) { | |
| 290 format |= ESD_MONO; | |
| 291 } else { | |
| 292 format |= ESD_STEREO; | |
| 293 } | |
| 294 #if 0 | |
| 295 spec->samples = ESD_BUF_SIZE; /* Darn, no way to change this yet */ | |
| 296 #endif | |
| 297 | |
| 298 /* Open a connection to the ESD audio server */ | |
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299 audio_fd = SDL_NAME(esd_play_stream)(format, spec->freq, NULL, get_progname()); |
| 0 | 300 if ( audio_fd < 0 ) { |
| 301 SDL_SetError("Couldn't open ESD connection"); | |
| 302 return(-1); | |
| 303 } | |
| 304 | |
| 305 /* Calculate the final parameters for this audio specification */ | |
| 306 SDL_CalculateAudioSpec(spec); | |
| 307 frame_ticks = (float)(spec->samples*1000)/spec->freq; | |
| 308 next_frame = SDL_GetTicks()+frame_ticks; | |
| 309 | |
| 310 /* Allocate mixing buffer */ | |
| 311 mixlen = spec->size; | |
| 312 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); | |
| 313 if ( mixbuf == NULL ) { | |
| 314 return(-1); | |
| 315 } | |
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316 SDL_memset(mixbuf, spec->silence, spec->size); |
| 0 | 317 |
| 318 /* Get the parent process id (we're the parent of the audio thread) */ | |
| 319 parent = getpid(); | |
| 320 | |
| 321 /* We're ready to rock and roll. :-) */ | |
| 322 return(0); | |
| 323 } |