Mercurial > sdl-ios-xcode
annotate src/audio/esd/SDL_esdaudio.c @ 1406:39ca9a4b22f3
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 21 Feb 2006 09:14:58 +0000 |
| parents | d910939febfa |
| children | 9f836cec0521 |
| 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 | |
| 26 #include <errno.h> | |
| 27 #include <esd.h> | |
| 28 | |
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29 #include "SDL_timer.h" |
| 0 | 30 #include "SDL_audio.h" |
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31 #include "../SDL_audiomem.h" |
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32 #include "../SDL_audio_c.h" |
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33 #include "../SDL_audiodev_c.h" |
| 0 | 34 #include "SDL_esdaudio.h" |
| 35 | |
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36 #ifdef SDL_AUDIO_DRIVER_ESD_DYNAMIC |
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37 #include "SDL_name.h" |
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38 #include "SDL_loadso.h" |
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39 #else |
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40 #define SDL_NAME(X) X |
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41 #endif |
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42 |
| 0 | 43 /* The tag name used by ESD audio */ |
| 44 #define ESD_DRIVER_NAME "esd" | |
| 45 | |
| 46 /* Audio driver functions */ | |
| 47 static int ESD_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 48 static void ESD_WaitAudio(_THIS); | |
| 49 static void ESD_PlayAudio(_THIS); | |
| 50 static Uint8 *ESD_GetAudioBuf(_THIS); | |
| 51 static void ESD_CloseAudio(_THIS); | |
| 52 | |
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53 #ifdef SDL_AUDIO_DRIVER_ESD_DYNAMIC |
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54 |
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55 static const char *esd_library = SDL_AUDIO_DRIVER_ESD_DYNAMIC; |
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56 static void *esd_handle = NULL; |
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57 static int esd_loaded = 0; |
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58 |
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59 static int (*SDL_NAME(esd_open_sound))( const char *host ); |
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60 static int (*SDL_NAME(esd_close))( int esd ); |
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61 static int (*SDL_NAME(esd_play_stream))( esd_format_t format, int rate, |
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62 const char *host, const char *name ); |
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63 static struct { |
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64 const char *name; |
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65 void **func; |
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66 } esd_functions[] = { |
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67 { "esd_open_sound", (void **)&SDL_NAME(esd_open_sound) }, |
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68 { "esd_close", (void **)&SDL_NAME(esd_close) }, |
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69 { "esd_play_stream", (void **)&SDL_NAME(esd_play_stream) }, |
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70 }; |
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71 |
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72 static void UnloadESDLibrary() |
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73 { |
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74 if ( esd_loaded ) { |
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75 SDL_UnloadObject(esd_handle); |
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76 esd_handle = NULL; |
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77 esd_loaded = 0; |
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78 } |
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79 } |
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80 |
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81 static int LoadESDLibrary(void) |
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82 { |
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83 int i, retval = -1; |
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84 |
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85 esd_handle = SDL_LoadObject(esd_library); |
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86 if ( esd_handle ) { |
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87 esd_loaded = 1; |
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88 retval = 0; |
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89 for ( i=0; i<SDL_arraysize(esd_functions); ++i ) { |
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90 *esd_functions[i].func = SDL_LoadFunction(esd_handle, esd_functions[i].name); |
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91 if ( !*esd_functions[i].func ) { |
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92 retval = -1; |
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93 UnloadESDLibrary(); |
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94 break; |
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95 } |
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96 } |
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97 } |
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98 return retval; |
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99 } |
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100 |
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101 #else |
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102 |
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103 static void UnloadESDLibrary() |
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104 { |
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105 return; |
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106 } |
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107 |
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108 static int LoadESDLibrary(void) |
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109 { |
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110 return 0; |
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111 } |
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112 |
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113 #endif /* SDL_AUDIO_DRIVER_ESD_DYNAMIC */ |
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114 |
| 0 | 115 /* Audio driver bootstrap functions */ |
| 116 | |
| 117 static int Audio_Available(void) | |
| 118 { | |
| 119 int connection; | |
| 120 int available; | |
| 121 | |
| 122 available = 0; | |
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123 if ( LoadESDLibrary() < 0 ) { |
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124 return available; |
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125 } |
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126 connection = SDL_NAME(esd_open_sound)(NULL); |
| 0 | 127 if ( connection >= 0 ) { |
| 128 available = 1; | |
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129 SDL_NAME(esd_close)(connection); |
| 0 | 130 } |
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131 UnloadESDLibrary(); |
| 0 | 132 return(available); |
| 133 } | |
| 134 | |
| 135 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 136 { | |
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137 SDL_free(device->hidden); |
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138 SDL_free(device); |
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139 UnloadESDLibrary(); |
| 0 | 140 } |
| 141 | |
| 142 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 143 { | |
| 144 SDL_AudioDevice *this; | |
| 145 | |
| 146 /* Initialize all variables that we clean on shutdown */ | |
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147 LoadESDLibrary(); |
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148 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 0 | 149 if ( this ) { |
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150 SDL_memset(this, 0, (sizeof *this)); |
| 0 | 151 this->hidden = (struct SDL_PrivateAudioData *) |
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152 SDL_malloc((sizeof *this->hidden)); |
| 0 | 153 } |
| 154 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 155 SDL_OutOfMemory(); | |
| 156 if ( this ) { | |
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157 SDL_free(this); |
| 0 | 158 } |
| 159 return(0); | |
| 160 } | |
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161 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| 0 | 162 audio_fd = -1; |
| 163 | |
| 164 /* Set the function pointers */ | |
| 165 this->OpenAudio = ESD_OpenAudio; | |
| 166 this->WaitAudio = ESD_WaitAudio; | |
| 167 this->PlayAudio = ESD_PlayAudio; | |
| 168 this->GetAudioBuf = ESD_GetAudioBuf; | |
| 169 this->CloseAudio = ESD_CloseAudio; | |
| 170 | |
| 171 this->free = Audio_DeleteDevice; | |
| 172 | |
| 173 return this; | |
| 174 } | |
| 175 | |
| 176 AudioBootStrap ESD_bootstrap = { | |
| 177 ESD_DRIVER_NAME, "Enlightened Sound Daemon", | |
| 178 Audio_Available, Audio_CreateDevice | |
| 179 }; | |
| 180 | |
| 181 /* This function waits until it is possible to write a full sound buffer */ | |
| 182 static void ESD_WaitAudio(_THIS) | |
| 183 { | |
| 184 Sint32 ticks; | |
| 185 | |
| 186 /* Check to see if the thread-parent process is still alive */ | |
| 187 { static int cnt = 0; | |
| 188 /* Note that this only works with thread implementations | |
| 189 that use a different process id for each thread. | |
| 190 */ | |
| 191 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */ | |
| 192 if ( kill(parent, 0) < 0 ) { | |
| 193 this->enabled = 0; | |
| 194 } | |
| 195 } | |
| 196 } | |
| 197 | |
| 198 /* Use timer for general audio synchronization */ | |
| 199 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS; | |
| 200 if ( ticks > 0 ) { | |
| 201 SDL_Delay(ticks); | |
| 202 } | |
| 203 } | |
| 204 | |
| 205 static void ESD_PlayAudio(_THIS) | |
| 206 { | |
| 207 int written; | |
| 208 | |
| 209 /* Write the audio data, checking for EAGAIN on broken audio drivers */ | |
| 210 do { | |
| 211 written = write(audio_fd, mixbuf, mixlen); | |
| 212 if ( (written < 0) && ((errno == 0) || (errno == EAGAIN)) ) { | |
| 213 SDL_Delay(1); /* Let a little CPU time go by */ | |
| 214 } | |
| 215 } while ( (written < 0) && | |
| 216 ((errno == 0) || (errno == EAGAIN) || (errno == EINTR)) ); | |
| 217 | |
| 218 /* Set the next write frame */ | |
| 219 next_frame += frame_ticks; | |
| 220 | |
| 221 /* If we couldn't write, assume fatal error for now */ | |
| 222 if ( written < 0 ) { | |
| 223 this->enabled = 0; | |
| 224 } | |
| 225 } | |
| 226 | |
| 227 static Uint8 *ESD_GetAudioBuf(_THIS) | |
| 228 { | |
| 229 return(mixbuf); | |
| 230 } | |
| 231 | |
| 232 static void ESD_CloseAudio(_THIS) | |
| 233 { | |
| 234 if ( mixbuf != NULL ) { | |
| 235 SDL_FreeAudioMem(mixbuf); | |
| 236 mixbuf = NULL; | |
| 237 } | |
| 238 if ( audio_fd >= 0 ) { | |
|
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239 SDL_NAME(esd_close)(audio_fd); |
| 0 | 240 audio_fd = -1; |
| 241 } | |
| 242 } | |
| 243 | |
| 244 /* Try to get the name of the program */ | |
| 245 static char *get_progname(void) | |
| 246 { | |
| 247 char *progname = NULL; | |
|
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248 #ifdef __LINUX__ |
| 0 | 249 FILE *fp; |
| 250 static char temp[BUFSIZ]; | |
| 251 | |
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252 SDL_snprintf(temp, SDL_arraysize(temp), "/proc/%d/cmdline", getpid()); |
| 0 | 253 fp = fopen(temp, "r"); |
| 254 if ( fp != NULL ) { | |
| 255 if ( fgets(temp, sizeof(temp)-1, fp) ) { | |
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256 progname = SDL_strrchr(temp, '/'); |
| 0 | 257 if ( progname == NULL ) { |
| 258 progname = temp; | |
| 259 } else { | |
| 260 progname = progname+1; | |
| 261 } | |
| 262 } | |
| 263 fclose(fp); | |
| 264 } | |
| 265 #endif | |
| 266 return(progname); | |
| 267 } | |
| 268 | |
| 269 static int ESD_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 270 { | |
| 271 esd_format_t format; | |
| 272 | |
| 273 /* Convert audio spec to the ESD audio format */ | |
| 274 format = (ESD_STREAM | ESD_PLAY); | |
| 275 switch ( spec->format & 0xFF ) { | |
| 276 case 8: | |
| 277 format |= ESD_BITS8; | |
| 278 break; | |
| 279 case 16: | |
| 280 format |= ESD_BITS16; | |
| 281 break; | |
| 282 default: | |
| 283 SDL_SetError("Unsupported ESD audio format"); | |
| 284 return(-1); | |
| 285 } | |
| 286 if ( spec->channels == 1 ) { | |
| 287 format |= ESD_MONO; | |
| 288 } else { | |
| 289 format |= ESD_STEREO; | |
| 290 } | |
| 291 #if 0 | |
| 292 spec->samples = ESD_BUF_SIZE; /* Darn, no way to change this yet */ | |
| 293 #endif | |
| 294 | |
| 295 /* Open a connection to the ESD audio server */ | |
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296 audio_fd = SDL_NAME(esd_play_stream)(format, spec->freq, NULL, get_progname()); |
| 0 | 297 if ( audio_fd < 0 ) { |
| 298 SDL_SetError("Couldn't open ESD connection"); | |
| 299 return(-1); | |
| 300 } | |
| 301 | |
| 302 /* Calculate the final parameters for this audio specification */ | |
| 303 SDL_CalculateAudioSpec(spec); | |
| 304 frame_ticks = (float)(spec->samples*1000)/spec->freq; | |
| 305 next_frame = SDL_GetTicks()+frame_ticks; | |
| 306 | |
| 307 /* Allocate mixing buffer */ | |
| 308 mixlen = spec->size; | |
| 309 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); | |
| 310 if ( mixbuf == NULL ) { | |
| 311 return(-1); | |
| 312 } | |
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313 SDL_memset(mixbuf, spec->silence, spec->size); |
| 0 | 314 |
| 315 /* Get the parent process id (we're the parent of the audio thread) */ | |
| 316 parent = getpid(); | |
| 317 | |
| 318 /* We're ready to rock and roll. :-) */ | |
| 319 return(0); | |
| 320 } |