Mercurial > sdl-ios-xcode
annotate src/audio/esd/SDL_esdaudio.c @ 1312:c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
I batch edited these files, so please let me know if I've accidentally removed anybody's
credit here.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 01 Feb 2006 06:32:25 +0000 |
| parents | 0c892e99b65b |
| children | 3692456e7b0f |
| 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 */ |
| 22 | |
| 23 /* Allow access to an ESD network stream mixing buffer */ | |
| 24 | |
| 25 #ifdef ESD_SUPPORT | |
| 26 | |
| 27 #include <stdlib.h> | |
| 28 #include <stdio.h> | |
| 29 #include <string.h> | |
| 30 #include <errno.h> | |
| 31 #include <signal.h> | |
| 32 #include <unistd.h> | |
| 33 | |
| 34 #include <esd.h> | |
| 35 | |
| 36 #include "SDL_audio.h" | |
| 37 #include "SDL_error.h" | |
| 38 #include "SDL_audiomem.h" | |
| 39 #include "SDL_audio_c.h" | |
| 40 #include "SDL_timer.h" | |
| 41 #include "SDL_audiodev_c.h" | |
| 42 #include "SDL_esdaudio.h" | |
| 43 | |
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44 #ifdef ESD_DYNAMIC |
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45 #include "SDL_name.h" |
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46 #include "SDL_loadso.h" |
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47 #else |
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48 #define SDL_NAME(X) X |
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49 #endif |
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50 |
| 0 | 51 /* The tag name used by ESD audio */ |
| 52 #define ESD_DRIVER_NAME "esd" | |
| 53 | |
| 54 /* Audio driver functions */ | |
| 55 static int ESD_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 56 static void ESD_WaitAudio(_THIS); | |
| 57 static void ESD_PlayAudio(_THIS); | |
| 58 static Uint8 *ESD_GetAudioBuf(_THIS); | |
| 59 static void ESD_CloseAudio(_THIS); | |
| 60 | |
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61 #ifdef ESD_DYNAMIC |
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62 |
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63 static const char *esd_library = ESD_DYNAMIC; |
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64 static void *esd_handle = NULL; |
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65 static int esd_loaded = 0; |
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66 |
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67 static int (*SDL_NAME(esd_open_sound))( const char *host ); |
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68 static int (*SDL_NAME(esd_close))( int esd ); |
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69 static int (*SDL_NAME(esd_play_stream))( esd_format_t format, int rate, |
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70 const char *host, const char *name ); |
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71 static struct { |
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72 const char *name; |
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73 void **func; |
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74 } esd_functions[] = { |
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75 { "esd_open_sound", (void **)&SDL_NAME(esd_open_sound) }, |
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76 { "esd_close", (void **)&SDL_NAME(esd_close) }, |
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77 { "esd_play_stream", (void **)&SDL_NAME(esd_play_stream) }, |
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78 }; |
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79 |
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80 static void UnloadESDLibrary() |
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81 { |
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82 if ( esd_loaded ) { |
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83 SDL_UnloadObject(esd_handle); |
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84 esd_handle = NULL; |
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85 esd_loaded = 0; |
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86 } |
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87 } |
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88 |
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89 static int LoadESDLibrary(void) |
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90 { |
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91 int i, retval = -1; |
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92 |
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93 esd_handle = SDL_LoadObject(esd_library); |
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94 if ( esd_handle ) { |
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95 esd_loaded = 1; |
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96 retval = 0; |
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97 for ( i=0; i<SDL_TABLESIZE(esd_functions); ++i ) { |
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98 *esd_functions[i].func = SDL_LoadFunction(esd_handle, esd_functions[i].name); |
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99 if ( !*esd_functions[i].func ) { |
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100 retval = -1; |
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101 UnloadESDLibrary(); |
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102 break; |
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103 } |
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104 } |
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105 } |
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106 return retval; |
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107 } |
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108 |
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109 #else |
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110 |
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111 static void UnloadESDLibrary() |
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112 { |
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113 return; |
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114 } |
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115 |
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116 static int LoadESDLibrary(void) |
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117 { |
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118 return 0; |
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119 } |
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120 |
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121 #endif /* ESD_DYNAMIC */ |
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122 |
| 0 | 123 /* Audio driver bootstrap functions */ |
| 124 | |
| 125 static int Audio_Available(void) | |
| 126 { | |
| 127 int connection; | |
| 128 int available; | |
| 129 | |
| 130 available = 0; | |
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131 if ( LoadESDLibrary() < 0 ) { |
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132 return available; |
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133 } |
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134 connection = SDL_NAME(esd_open_sound)(NULL); |
| 0 | 135 if ( connection >= 0 ) { |
| 136 available = 1; | |
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137 SDL_NAME(esd_close)(connection); |
| 0 | 138 } |
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139 UnloadESDLibrary(); |
| 0 | 140 return(available); |
| 141 } | |
| 142 | |
| 143 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 144 { | |
| 145 free(device->hidden); | |
| 146 free(device); | |
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147 UnloadESDLibrary(); |
| 0 | 148 } |
| 149 | |
| 150 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 151 { | |
| 152 SDL_AudioDevice *this; | |
| 153 | |
| 154 /* Initialize all variables that we clean on shutdown */ | |
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155 LoadESDLibrary(); |
| 0 | 156 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); |
| 157 if ( this ) { | |
| 158 memset(this, 0, (sizeof *this)); | |
| 159 this->hidden = (struct SDL_PrivateAudioData *) | |
| 160 malloc((sizeof *this->hidden)); | |
| 161 } | |
| 162 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 163 SDL_OutOfMemory(); | |
| 164 if ( this ) { | |
| 165 free(this); | |
| 166 } | |
| 167 return(0); | |
| 168 } | |
| 169 memset(this->hidden, 0, (sizeof *this->hidden)); | |
| 170 audio_fd = -1; | |
| 171 | |
| 172 /* Set the function pointers */ | |
| 173 this->OpenAudio = ESD_OpenAudio; | |
| 174 this->WaitAudio = ESD_WaitAudio; | |
| 175 this->PlayAudio = ESD_PlayAudio; | |
| 176 this->GetAudioBuf = ESD_GetAudioBuf; | |
| 177 this->CloseAudio = ESD_CloseAudio; | |
| 178 | |
| 179 this->free = Audio_DeleteDevice; | |
| 180 | |
| 181 return this; | |
| 182 } | |
| 183 | |
| 184 AudioBootStrap ESD_bootstrap = { | |
| 185 ESD_DRIVER_NAME, "Enlightened Sound Daemon", | |
| 186 Audio_Available, Audio_CreateDevice | |
| 187 }; | |
| 188 | |
| 189 /* This function waits until it is possible to write a full sound buffer */ | |
| 190 static void ESD_WaitAudio(_THIS) | |
| 191 { | |
| 192 Sint32 ticks; | |
| 193 | |
| 194 /* Check to see if the thread-parent process is still alive */ | |
| 195 { static int cnt = 0; | |
| 196 /* Note that this only works with thread implementations | |
| 197 that use a different process id for each thread. | |
| 198 */ | |
| 199 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */ | |
| 200 if ( kill(parent, 0) < 0 ) { | |
| 201 this->enabled = 0; | |
| 202 } | |
| 203 } | |
| 204 } | |
| 205 | |
| 206 /* Use timer for general audio synchronization */ | |
| 207 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS; | |
| 208 if ( ticks > 0 ) { | |
| 209 SDL_Delay(ticks); | |
| 210 } | |
| 211 } | |
| 212 | |
| 213 static void ESD_PlayAudio(_THIS) | |
| 214 { | |
| 215 int written; | |
| 216 | |
| 217 /* Write the audio data, checking for EAGAIN on broken audio drivers */ | |
| 218 do { | |
| 219 written = write(audio_fd, mixbuf, mixlen); | |
| 220 if ( (written < 0) && ((errno == 0) || (errno == EAGAIN)) ) { | |
| 221 SDL_Delay(1); /* Let a little CPU time go by */ | |
| 222 } | |
| 223 } while ( (written < 0) && | |
| 224 ((errno == 0) || (errno == EAGAIN) || (errno == EINTR)) ); | |
| 225 | |
| 226 /* Set the next write frame */ | |
| 227 next_frame += frame_ticks; | |
| 228 | |
| 229 /* If we couldn't write, assume fatal error for now */ | |
| 230 if ( written < 0 ) { | |
| 231 this->enabled = 0; | |
| 232 } | |
| 233 } | |
| 234 | |
| 235 static Uint8 *ESD_GetAudioBuf(_THIS) | |
| 236 { | |
| 237 return(mixbuf); | |
| 238 } | |
| 239 | |
| 240 static void ESD_CloseAudio(_THIS) | |
| 241 { | |
| 242 if ( mixbuf != NULL ) { | |
| 243 SDL_FreeAudioMem(mixbuf); | |
| 244 mixbuf = NULL; | |
| 245 } | |
| 246 if ( audio_fd >= 0 ) { | |
|
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|
247 SDL_NAME(esd_close)(audio_fd); |
| 0 | 248 audio_fd = -1; |
| 249 } | |
| 250 } | |
| 251 | |
| 252 /* Try to get the name of the program */ | |
| 253 static char *get_progname(void) | |
| 254 { | |
| 255 char *progname = NULL; | |
| 256 #ifdef linux | |
| 257 FILE *fp; | |
| 258 static char temp[BUFSIZ]; | |
| 259 | |
| 260 sprintf(temp, "/proc/%d/cmdline", getpid()); | |
| 261 fp = fopen(temp, "r"); | |
| 262 if ( fp != NULL ) { | |
| 263 if ( fgets(temp, sizeof(temp)-1, fp) ) { | |
| 264 progname = strrchr(temp, '/'); | |
| 265 if ( progname == NULL ) { | |
| 266 progname = temp; | |
| 267 } else { | |
| 268 progname = progname+1; | |
| 269 } | |
| 270 } | |
| 271 fclose(fp); | |
| 272 } | |
| 273 #endif | |
| 274 return(progname); | |
| 275 } | |
| 276 | |
| 277 static int ESD_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 278 { | |
| 279 esd_format_t format; | |
| 280 | |
| 281 /* Convert audio spec to the ESD audio format */ | |
| 282 format = (ESD_STREAM | ESD_PLAY); | |
| 283 switch ( spec->format & 0xFF ) { | |
| 284 case 8: | |
| 285 format |= ESD_BITS8; | |
| 286 break; | |
| 287 case 16: | |
| 288 format |= ESD_BITS16; | |
| 289 break; | |
| 290 default: | |
| 291 SDL_SetError("Unsupported ESD audio format"); | |
| 292 return(-1); | |
| 293 } | |
| 294 if ( spec->channels == 1 ) { | |
| 295 format |= ESD_MONO; | |
| 296 } else { | |
| 297 format |= ESD_STEREO; | |
| 298 } | |
| 299 #if 0 | |
| 300 spec->samples = ESD_BUF_SIZE; /* Darn, no way to change this yet */ | |
| 301 #endif | |
| 302 | |
| 303 /* Open a connection to the ESD audio server */ | |
|
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parents:
252
diff
changeset
|
304 audio_fd = SDL_NAME(esd_play_stream)(format, spec->freq, NULL, get_progname()); |
| 0 | 305 if ( audio_fd < 0 ) { |
| 306 SDL_SetError("Couldn't open ESD connection"); | |
| 307 return(-1); | |
| 308 } | |
| 309 | |
| 310 /* Calculate the final parameters for this audio specification */ | |
| 311 SDL_CalculateAudioSpec(spec); | |
| 312 frame_ticks = (float)(spec->samples*1000)/spec->freq; | |
| 313 next_frame = SDL_GetTicks()+frame_ticks; | |
| 314 | |
| 315 /* Allocate mixing buffer */ | |
| 316 mixlen = spec->size; | |
| 317 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); | |
| 318 if ( mixbuf == NULL ) { | |
| 319 return(-1); | |
| 320 } | |
| 321 memset(mixbuf, spec->silence, spec->size); | |
| 322 | |
| 323 /* Get the parent process id (we're the parent of the audio thread) */ | |
| 324 parent = getpid(); | |
| 325 | |
| 326 /* We're ready to rock and roll. :-) */ | |
| 327 return(0); | |
| 328 } | |
| 329 | |
| 330 #endif /* ESD_SUPPORT */ |