Mercurial > sdl-ios-xcode
annotate src/audio/esd/SDL_esdaudio.c @ 956:4263beff9e38
Date: Mon, 30 Aug 2004 18:20:25 +0200
From: Joost Baas
Subject: why call arts artsc?
I, and a few other people at the mplayer-docs-mailinglist were wondering why
you decided to call arts artsc. I understand usually users have nothing to do
with libsdl, just developers, but because you can choose the audio-driver
being used by mplayer, one of which is sdl, and you can also choose the sdl
subdriver, it is necessary to have a well-known or logical name. artsc is not
the logical choice, and it's very hard to look up the right name if you don't
know what you're looking for.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 17 Sep 2004 13:25:06 +0000 |
| parents | 0c892e99b65b |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 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 | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* Allow access to an ESD network stream mixing buffer */ | |
| 29 | |
| 30 #ifdef ESD_SUPPORT | |
| 31 | |
| 32 #include <stdlib.h> | |
| 33 #include <stdio.h> | |
| 34 #include <string.h> | |
| 35 #include <errno.h> | |
| 36 #include <signal.h> | |
| 37 #include <unistd.h> | |
| 38 | |
| 39 #include <esd.h> | |
| 40 | |
| 41 #include "SDL_audio.h" | |
| 42 #include "SDL_error.h" | |
| 43 #include "SDL_audiomem.h" | |
| 44 #include "SDL_audio_c.h" | |
| 45 #include "SDL_timer.h" | |
| 46 #include "SDL_audiodev_c.h" | |
| 47 #include "SDL_esdaudio.h" | |
| 48 | |
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49 #ifdef ESD_DYNAMIC |
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50 #include "SDL_name.h" |
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51 #include "SDL_loadso.h" |
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52 #else |
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53 #define SDL_NAME(X) X |
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54 #endif |
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55 |
| 0 | 56 /* The tag name used by ESD audio */ |
| 57 #define ESD_DRIVER_NAME "esd" | |
| 58 | |
| 59 /* Audio driver functions */ | |
| 60 static int ESD_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 61 static void ESD_WaitAudio(_THIS); | |
| 62 static void ESD_PlayAudio(_THIS); | |
| 63 static Uint8 *ESD_GetAudioBuf(_THIS); | |
| 64 static void ESD_CloseAudio(_THIS); | |
| 65 | |
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66 #ifdef ESD_DYNAMIC |
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67 |
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68 static const char *esd_library = ESD_DYNAMIC; |
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69 static void *esd_handle = NULL; |
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70 static int esd_loaded = 0; |
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71 |
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72 static int (*SDL_NAME(esd_open_sound))( const char *host ); |
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73 static int (*SDL_NAME(esd_close))( int esd ); |
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74 static int (*SDL_NAME(esd_play_stream))( esd_format_t format, int rate, |
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75 const char *host, const char *name ); |
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76 static struct { |
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77 const char *name; |
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78 void **func; |
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79 } esd_functions[] = { |
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80 { "esd_open_sound", (void **)&SDL_NAME(esd_open_sound) }, |
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81 { "esd_close", (void **)&SDL_NAME(esd_close) }, |
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82 { "esd_play_stream", (void **)&SDL_NAME(esd_play_stream) }, |
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83 }; |
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84 |
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85 static void UnloadESDLibrary() |
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86 { |
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87 if ( esd_loaded ) { |
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88 SDL_UnloadObject(esd_handle); |
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89 esd_handle = NULL; |
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90 esd_loaded = 0; |
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91 } |
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92 } |
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93 |
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94 static int LoadESDLibrary(void) |
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95 { |
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96 int i, retval = -1; |
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97 |
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98 esd_handle = SDL_LoadObject(esd_library); |
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99 if ( esd_handle ) { |
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100 esd_loaded = 1; |
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101 retval = 0; |
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102 for ( i=0; i<SDL_TABLESIZE(esd_functions); ++i ) { |
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103 *esd_functions[i].func = SDL_LoadFunction(esd_handle, esd_functions[i].name); |
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104 if ( !*esd_functions[i].func ) { |
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105 retval = -1; |
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106 UnloadESDLibrary(); |
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107 break; |
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108 } |
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109 } |
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110 } |
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111 return retval; |
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112 } |
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113 |
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114 #else |
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115 |
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116 static void UnloadESDLibrary() |
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117 { |
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118 return; |
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119 } |
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120 |
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121 static int LoadESDLibrary(void) |
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122 { |
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123 return 0; |
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124 } |
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125 |
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126 #endif /* ESD_DYNAMIC */ |
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127 |
| 0 | 128 /* Audio driver bootstrap functions */ |
| 129 | |
| 130 static int Audio_Available(void) | |
| 131 { | |
| 132 int connection; | |
| 133 int available; | |
| 134 | |
| 135 available = 0; | |
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136 if ( LoadESDLibrary() < 0 ) { |
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137 return available; |
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138 } |
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139 connection = SDL_NAME(esd_open_sound)(NULL); |
| 0 | 140 if ( connection >= 0 ) { |
| 141 available = 1; | |
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142 SDL_NAME(esd_close)(connection); |
| 0 | 143 } |
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144 UnloadESDLibrary(); |
| 0 | 145 return(available); |
| 146 } | |
| 147 | |
| 148 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 149 { | |
| 150 free(device->hidden); | |
| 151 free(device); | |
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152 UnloadESDLibrary(); |
| 0 | 153 } |
| 154 | |
| 155 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 156 { | |
| 157 SDL_AudioDevice *this; | |
| 158 | |
| 159 /* Initialize all variables that we clean on shutdown */ | |
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160 LoadESDLibrary(); |
| 0 | 161 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); |
| 162 if ( this ) { | |
| 163 memset(this, 0, (sizeof *this)); | |
| 164 this->hidden = (struct SDL_PrivateAudioData *) | |
| 165 malloc((sizeof *this->hidden)); | |
| 166 } | |
| 167 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 168 SDL_OutOfMemory(); | |
| 169 if ( this ) { | |
| 170 free(this); | |
| 171 } | |
| 172 return(0); | |
| 173 } | |
| 174 memset(this->hidden, 0, (sizeof *this->hidden)); | |
| 175 audio_fd = -1; | |
| 176 | |
| 177 /* Set the function pointers */ | |
| 178 this->OpenAudio = ESD_OpenAudio; | |
| 179 this->WaitAudio = ESD_WaitAudio; | |
| 180 this->PlayAudio = ESD_PlayAudio; | |
| 181 this->GetAudioBuf = ESD_GetAudioBuf; | |
| 182 this->CloseAudio = ESD_CloseAudio; | |
| 183 | |
| 184 this->free = Audio_DeleteDevice; | |
| 185 | |
| 186 return this; | |
| 187 } | |
| 188 | |
| 189 AudioBootStrap ESD_bootstrap = { | |
| 190 ESD_DRIVER_NAME, "Enlightened Sound Daemon", | |
| 191 Audio_Available, Audio_CreateDevice | |
| 192 }; | |
| 193 | |
| 194 /* This function waits until it is possible to write a full sound buffer */ | |
| 195 static void ESD_WaitAudio(_THIS) | |
| 196 { | |
| 197 Sint32 ticks; | |
| 198 | |
| 199 /* Check to see if the thread-parent process is still alive */ | |
| 200 { static int cnt = 0; | |
| 201 /* Note that this only works with thread implementations | |
| 202 that use a different process id for each thread. | |
| 203 */ | |
| 204 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */ | |
| 205 if ( kill(parent, 0) < 0 ) { | |
| 206 this->enabled = 0; | |
| 207 } | |
| 208 } | |
| 209 } | |
| 210 | |
| 211 /* Use timer for general audio synchronization */ | |
| 212 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS; | |
| 213 if ( ticks > 0 ) { | |
| 214 SDL_Delay(ticks); | |
| 215 } | |
| 216 } | |
| 217 | |
| 218 static void ESD_PlayAudio(_THIS) | |
| 219 { | |
| 220 int written; | |
| 221 | |
| 222 /* Write the audio data, checking for EAGAIN on broken audio drivers */ | |
| 223 do { | |
| 224 written = write(audio_fd, mixbuf, mixlen); | |
| 225 if ( (written < 0) && ((errno == 0) || (errno == EAGAIN)) ) { | |
| 226 SDL_Delay(1); /* Let a little CPU time go by */ | |
| 227 } | |
| 228 } while ( (written < 0) && | |
| 229 ((errno == 0) || (errno == EAGAIN) || (errno == EINTR)) ); | |
| 230 | |
| 231 /* Set the next write frame */ | |
| 232 next_frame += frame_ticks; | |
| 233 | |
| 234 /* If we couldn't write, assume fatal error for now */ | |
| 235 if ( written < 0 ) { | |
| 236 this->enabled = 0; | |
| 237 } | |
| 238 } | |
| 239 | |
| 240 static Uint8 *ESD_GetAudioBuf(_THIS) | |
| 241 { | |
| 242 return(mixbuf); | |
| 243 } | |
| 244 | |
| 245 static void ESD_CloseAudio(_THIS) | |
| 246 { | |
| 247 if ( mixbuf != NULL ) { | |
| 248 SDL_FreeAudioMem(mixbuf); | |
| 249 mixbuf = NULL; | |
| 250 } | |
| 251 if ( audio_fd >= 0 ) { | |
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252 SDL_NAME(esd_close)(audio_fd); |
| 0 | 253 audio_fd = -1; |
| 254 } | |
| 255 } | |
| 256 | |
| 257 /* Try to get the name of the program */ | |
| 258 static char *get_progname(void) | |
| 259 { | |
| 260 char *progname = NULL; | |
| 261 #ifdef linux | |
| 262 FILE *fp; | |
| 263 static char temp[BUFSIZ]; | |
| 264 | |
| 265 sprintf(temp, "/proc/%d/cmdline", getpid()); | |
| 266 fp = fopen(temp, "r"); | |
| 267 if ( fp != NULL ) { | |
| 268 if ( fgets(temp, sizeof(temp)-1, fp) ) { | |
| 269 progname = strrchr(temp, '/'); | |
| 270 if ( progname == NULL ) { | |
| 271 progname = temp; | |
| 272 } else { | |
| 273 progname = progname+1; | |
| 274 } | |
| 275 } | |
| 276 fclose(fp); | |
| 277 } | |
| 278 #endif | |
| 279 return(progname); | |
| 280 } | |
| 281 | |
| 282 static int ESD_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 283 { | |
| 284 esd_format_t format; | |
| 285 | |
| 286 /* Convert audio spec to the ESD audio format */ | |
| 287 format = (ESD_STREAM | ESD_PLAY); | |
| 288 switch ( spec->format & 0xFF ) { | |
| 289 case 8: | |
| 290 format |= ESD_BITS8; | |
| 291 break; | |
| 292 case 16: | |
| 293 format |= ESD_BITS16; | |
| 294 break; | |
| 295 default: | |
| 296 SDL_SetError("Unsupported ESD audio format"); | |
| 297 return(-1); | |
| 298 } | |
| 299 if ( spec->channels == 1 ) { | |
| 300 format |= ESD_MONO; | |
| 301 } else { | |
| 302 format |= ESD_STEREO; | |
| 303 } | |
| 304 #if 0 | |
| 305 spec->samples = ESD_BUF_SIZE; /* Darn, no way to change this yet */ | |
| 306 #endif | |
| 307 | |
| 308 /* Open a connection to the ESD audio server */ | |
|
294
d2d48e10f370
Added a new header file: SDL_loadso.h
Sam Lantinga <slouken@libsdl.org>
parents:
252
diff
changeset
|
309 audio_fd = SDL_NAME(esd_play_stream)(format, spec->freq, NULL, get_progname()); |
| 0 | 310 if ( audio_fd < 0 ) { |
| 311 SDL_SetError("Couldn't open ESD connection"); | |
| 312 return(-1); | |
| 313 } | |
| 314 | |
| 315 /* Calculate the final parameters for this audio specification */ | |
| 316 SDL_CalculateAudioSpec(spec); | |
| 317 frame_ticks = (float)(spec->samples*1000)/spec->freq; | |
| 318 next_frame = SDL_GetTicks()+frame_ticks; | |
| 319 | |
| 320 /* Allocate mixing buffer */ | |
| 321 mixlen = spec->size; | |
| 322 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); | |
| 323 if ( mixbuf == NULL ) { | |
| 324 return(-1); | |
| 325 } | |
| 326 memset(mixbuf, spec->silence, spec->size); | |
| 327 | |
| 328 /* Get the parent process id (we're the parent of the audio thread) */ | |
| 329 parent = getpid(); | |
| 330 | |
| 331 /* We're ready to rock and roll. :-) */ | |
| 332 return(0); | |
| 333 } | |
| 334 | |
| 335 #endif /* ESD_SUPPORT */ |