Mercurial > sdl-ios-xcode
annotate src/audio/esd/SDL_esdaudio.c @ 252:e8157fcb3114
Updated the source with the correct e-mail address
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 14 Dec 2001 12:38:15 +0000 |
| parents | 74212992fb08 |
| children | d2d48e10f370 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga | |
| 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 | |
|
252
e8157fcb3114
Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
parents:
0
diff
changeset
|
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 | |
| 49 /* The tag name used by ESD audio */ | |
| 50 #define ESD_DRIVER_NAME "esd" | |
| 51 | |
| 52 /* Audio driver functions */ | |
| 53 static int ESD_OpenAudio(_THIS, SDL_AudioSpec *spec); | |
| 54 static void ESD_WaitAudio(_THIS); | |
| 55 static void ESD_PlayAudio(_THIS); | |
| 56 static Uint8 *ESD_GetAudioBuf(_THIS); | |
| 57 static void ESD_CloseAudio(_THIS); | |
| 58 | |
| 59 /* Audio driver bootstrap functions */ | |
| 60 | |
| 61 static int Audio_Available(void) | |
| 62 { | |
| 63 int connection; | |
| 64 int available; | |
| 65 | |
| 66 available = 0; | |
| 67 connection = esd_open_sound(NULL); | |
| 68 if ( connection >= 0 ) { | |
| 69 available = 1; | |
| 70 esd_close(connection); | |
| 71 } | |
| 72 return(available); | |
| 73 } | |
| 74 | |
| 75 static void Audio_DeleteDevice(SDL_AudioDevice *device) | |
| 76 { | |
| 77 free(device->hidden); | |
| 78 free(device); | |
| 79 } | |
| 80 | |
| 81 static SDL_AudioDevice *Audio_CreateDevice(int devindex) | |
| 82 { | |
| 83 SDL_AudioDevice *this; | |
| 84 | |
| 85 /* Initialize all variables that we clean on shutdown */ | |
| 86 this = (SDL_AudioDevice *)malloc(sizeof(SDL_AudioDevice)); | |
| 87 if ( this ) { | |
| 88 memset(this, 0, (sizeof *this)); | |
| 89 this->hidden = (struct SDL_PrivateAudioData *) | |
| 90 malloc((sizeof *this->hidden)); | |
| 91 } | |
| 92 if ( (this == NULL) || (this->hidden == NULL) ) { | |
| 93 SDL_OutOfMemory(); | |
| 94 if ( this ) { | |
| 95 free(this); | |
| 96 } | |
| 97 return(0); | |
| 98 } | |
| 99 memset(this->hidden, 0, (sizeof *this->hidden)); | |
| 100 audio_fd = -1; | |
| 101 | |
| 102 /* Set the function pointers */ | |
| 103 this->OpenAudio = ESD_OpenAudio; | |
| 104 this->WaitAudio = ESD_WaitAudio; | |
| 105 this->PlayAudio = ESD_PlayAudio; | |
| 106 this->GetAudioBuf = ESD_GetAudioBuf; | |
| 107 this->CloseAudio = ESD_CloseAudio; | |
| 108 | |
| 109 this->free = Audio_DeleteDevice; | |
| 110 | |
| 111 return this; | |
| 112 } | |
| 113 | |
| 114 AudioBootStrap ESD_bootstrap = { | |
| 115 ESD_DRIVER_NAME, "Enlightened Sound Daemon", | |
| 116 Audio_Available, Audio_CreateDevice | |
| 117 }; | |
| 118 | |
| 119 /* This function waits until it is possible to write a full sound buffer */ | |
| 120 static void ESD_WaitAudio(_THIS) | |
| 121 { | |
| 122 Sint32 ticks; | |
| 123 | |
| 124 /* Check to see if the thread-parent process is still alive */ | |
| 125 { static int cnt = 0; | |
| 126 /* Note that this only works with thread implementations | |
| 127 that use a different process id for each thread. | |
| 128 */ | |
| 129 if (parent && (((++cnt)%10) == 0)) { /* Check every 10 loops */ | |
| 130 if ( kill(parent, 0) < 0 ) { | |
| 131 this->enabled = 0; | |
| 132 } | |
| 133 } | |
| 134 } | |
| 135 | |
| 136 /* Use timer for general audio synchronization */ | |
| 137 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS; | |
| 138 if ( ticks > 0 ) { | |
| 139 SDL_Delay(ticks); | |
| 140 } | |
| 141 } | |
| 142 | |
| 143 static void ESD_PlayAudio(_THIS) | |
| 144 { | |
| 145 int written; | |
| 146 | |
| 147 /* Write the audio data, checking for EAGAIN on broken audio drivers */ | |
| 148 do { | |
| 149 written = write(audio_fd, mixbuf, mixlen); | |
| 150 if ( (written < 0) && ((errno == 0) || (errno == EAGAIN)) ) { | |
| 151 SDL_Delay(1); /* Let a little CPU time go by */ | |
| 152 } | |
| 153 } while ( (written < 0) && | |
| 154 ((errno == 0) || (errno == EAGAIN) || (errno == EINTR)) ); | |
| 155 | |
| 156 /* Set the next write frame */ | |
| 157 next_frame += frame_ticks; | |
| 158 | |
| 159 /* If we couldn't write, assume fatal error for now */ | |
| 160 if ( written < 0 ) { | |
| 161 this->enabled = 0; | |
| 162 } | |
| 163 } | |
| 164 | |
| 165 static Uint8 *ESD_GetAudioBuf(_THIS) | |
| 166 { | |
| 167 return(mixbuf); | |
| 168 } | |
| 169 | |
| 170 static void ESD_CloseAudio(_THIS) | |
| 171 { | |
| 172 if ( mixbuf != NULL ) { | |
| 173 SDL_FreeAudioMem(mixbuf); | |
| 174 mixbuf = NULL; | |
| 175 } | |
| 176 if ( audio_fd >= 0 ) { | |
| 177 close(audio_fd); | |
| 178 audio_fd = -1; | |
| 179 } | |
| 180 } | |
| 181 | |
| 182 /* Try to get the name of the program */ | |
| 183 static char *get_progname(void) | |
| 184 { | |
| 185 char *progname = NULL; | |
| 186 #ifdef linux | |
| 187 FILE *fp; | |
| 188 static char temp[BUFSIZ]; | |
| 189 | |
| 190 sprintf(temp, "/proc/%d/cmdline", getpid()); | |
| 191 fp = fopen(temp, "r"); | |
| 192 if ( fp != NULL ) { | |
| 193 if ( fgets(temp, sizeof(temp)-1, fp) ) { | |
| 194 progname = strrchr(temp, '/'); | |
| 195 if ( progname == NULL ) { | |
| 196 progname = temp; | |
| 197 } else { | |
| 198 progname = progname+1; | |
| 199 } | |
| 200 } | |
| 201 fclose(fp); | |
| 202 } | |
| 203 #endif | |
| 204 return(progname); | |
| 205 } | |
| 206 | |
| 207 static int ESD_OpenAudio(_THIS, SDL_AudioSpec *spec) | |
| 208 { | |
| 209 esd_format_t format; | |
| 210 | |
| 211 /* Convert audio spec to the ESD audio format */ | |
| 212 format = (ESD_STREAM | ESD_PLAY); | |
| 213 switch ( spec->format & 0xFF ) { | |
| 214 case 8: | |
| 215 format |= ESD_BITS8; | |
| 216 break; | |
| 217 case 16: | |
| 218 format |= ESD_BITS16; | |
| 219 break; | |
| 220 default: | |
| 221 SDL_SetError("Unsupported ESD audio format"); | |
| 222 return(-1); | |
| 223 } | |
| 224 if ( spec->channels == 1 ) { | |
| 225 format |= ESD_MONO; | |
| 226 } else { | |
| 227 format |= ESD_STEREO; | |
| 228 } | |
| 229 #if 0 | |
| 230 spec->samples = ESD_BUF_SIZE; /* Darn, no way to change this yet */ | |
| 231 #endif | |
| 232 | |
| 233 /* Open a connection to the ESD audio server */ | |
| 234 audio_fd = esd_play_stream(format, spec->freq, NULL, get_progname()); | |
| 235 if ( audio_fd < 0 ) { | |
| 236 SDL_SetError("Couldn't open ESD connection"); | |
| 237 return(-1); | |
| 238 } | |
| 239 | |
| 240 /* Calculate the final parameters for this audio specification */ | |
| 241 SDL_CalculateAudioSpec(spec); | |
| 242 frame_ticks = (float)(spec->samples*1000)/spec->freq; | |
| 243 next_frame = SDL_GetTicks()+frame_ticks; | |
| 244 | |
| 245 /* Allocate mixing buffer */ | |
| 246 mixlen = spec->size; | |
| 247 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); | |
| 248 if ( mixbuf == NULL ) { | |
| 249 return(-1); | |
| 250 } | |
| 251 memset(mixbuf, spec->silence, spec->size); | |
| 252 | |
| 253 /* Get the parent process id (we're the parent of the audio thread) */ | |
| 254 parent = getpid(); | |
| 255 | |
| 256 /* We're ready to rock and roll. :-) */ | |
| 257 return(0); | |
| 258 } | |
| 259 | |
| 260 #endif /* ESD_SUPPORT */ |