| 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997-2009 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 |
| 20 | slouken@libsdl.org |
| 21 | */ |
| 22 | #include "SDL_config.h" |
| 23 | |
| 24 | /* |
| 25 | * Driver for native OpenBSD/NetBSD audio(4). |
| 26 | * vedge@vedge.com.ar. |
| 27 | */ |
| 28 | |
| 29 | #include <errno.h> |
| 30 | #include <unistd.h> |
| 31 | #include <fcntl.h> |
| 32 | #include <sys/time.h> |
| 33 | #include <sys/ioctl.h> |
| 34 | #include <sys/stat.h> |
| 35 | #include <sys/types.h> |
| 36 | #include <sys/audioio.h> |
| 37 | |
| 38 | #include "SDL_timer.h" |
| 39 | #include "SDL_audio.h" |
| 40 | #include "../SDL_audiomem.h" |
| 41 | #include "../SDL_audio_c.h" |
| 42 | #include "../SDL_audiodev_c.h" |
| 43 | #include "SDL_bsdaudio.h" |
| 44 | |
| 45 | /* The tag name used by NetBSD/OpenBSD audio */ |
| 46 | #ifdef __NetBSD__ |
| 47 | #define BSD_AUDIO_DRIVER_NAME "netbsd" |
| 48 | #define BSD_AUDIO_DRIVER_DESC "Native NetBSD audio" |
| 49 | #else |
| 50 | #define BSD_AUDIO_DRIVER_NAME "openbsd" |
| 51 | #define BSD_AUDIO_DRIVER_DESC "Native OpenBSD audio" |
| 52 | #endif |
| 53 | |
| 54 | /* Open the audio device for playback, and don't block if busy */ |
| 55 | /* #define USE_BLOCKING_WRITES */ |
| 56 | |
| 57 | /* Use timer for synchronization */ |
| 58 | /* #define USE_TIMER_SYNC */ |
| 59 | |
| 60 | /* #define DEBUG_AUDIO */ |
| 61 | /* #define DEBUG_AUDIO_STREAM */ |
| 62 | |
| 63 | #ifdef USE_BLOCKING_WRITES |
| 64 | #define OPEN_FLAGS O_WRONLY |
| 65 | #else |
| 66 | #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK) |
| 67 | #endif |
| 68 | |
| 69 | /* Audio driver functions */ |
| 70 | static void OBSD_WaitAudio(_THIS); |
| 71 | static int OBSD_OpenAudio(_THIS, SDL_AudioSpec *spec); |
| 72 | static void OBSD_PlayAudio(_THIS); |
| 73 | static Uint8 *OBSD_GetAudioBuf(_THIS); |
| 74 | static void OBSD_CloseAudio(_THIS); |
| 75 | |
| 76 | #ifdef DEBUG_AUDIO |
| 77 | static void OBSD_Status(_THIS); |
| 78 | #endif |
| 79 | |
| 80 | /* Audio driver bootstrap functions */ |
| 81 | |
| 82 | static int |
| 83 | Audio_Available(void) |
| 84 | { |
| 85 | int fd; |
| 86 | int available; |
| 87 | |
| 88 | available = 0; |
| 89 | fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0); |
| 90 | if(fd >= 0) { |
| 91 | available = 1; |
| 92 | close(fd); |
| 93 | } |
| 94 | return(available); |
| 95 | } |
| 96 | |
| 97 | static void |
| 98 | Audio_DeleteDevice(SDL_AudioDevice *device) |
| 99 | { |
| 100 | SDL_free(device->hidden); |
| 101 | SDL_free(device); |
| 102 | } |
| 103 | |
| 104 | static SDL_AudioDevice |
| 105 | *Audio_CreateDevice(int devindex) |
| 106 | { |
| 107 | SDL_AudioDevice *this; |
| 108 | |
| 109 | /* Initialize all variables that we clean on shutdown */ |
| 110 | this = (SDL_AudioDevice*)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 111 | if(this) { |
| 112 | SDL_memset(this, 0, (sizeof *this)); |
| 113 | this->hidden = |
| 114 | (struct SDL_PrivateAudioData*)SDL_malloc((sizeof *this->hidden)); |
| 115 | } |
| 116 | if((this == NULL) || (this->hidden == NULL)) { |
| 117 | SDL_OutOfMemory(); |
| 118 | if(this) SDL_free(this); |
| 119 | return(0); |
| 120 | } |
| 121 | SDL_memset(this->hidden, 0, (sizeof *this->hidden)); |
| 122 | audio_fd = -1; |
| 123 | |
| 124 | /* Set the function pointers */ |
| 125 | this->OpenAudio = OBSD_OpenAudio; |
| 126 | this->WaitAudio = OBSD_WaitAudio; |
| 127 | this->PlayAudio = OBSD_PlayAudio; |
| 128 | this->GetAudioBuf = OBSD_GetAudioBuf; |
| 129 | this->CloseAudio = OBSD_CloseAudio; |
| 130 | |
| 131 | this->free = Audio_DeleteDevice; |
| 132 | |
| 133 | return this; |
| 134 | } |
| 135 | |
| 136 | AudioBootStrap BSD_AUDIO_bootstrap = { |
| 137 | BSD_AUDIO_DRIVER_NAME, BSD_AUDIO_DRIVER_DESC, |
| 138 | Audio_Available, Audio_CreateDevice |
| 139 | }; |
| 140 | |
| 141 | /* This function waits until it is possible to write a full sound buffer */ |
| 142 | static void |
| 143 | OBSD_WaitAudio(_THIS) |
| 144 | { |
| 145 | #ifndef USE_BLOCKING_WRITES /* Not necessary when using blocking writes */ |
| 146 | /* See if we need to use timed audio synchronization */ |
| 147 | if ( frame_ticks ) { |
| 148 | /* Use timer for general audio synchronization */ |
| 149 | Sint32 ticks; |
| 150 | |
| 151 | ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS; |
| 152 | if ( ticks > 0 ) { |
| 153 | SDL_Delay(ticks); |
| 154 | } |
| 155 | } else { |
| 156 | /* Use select() for audio synchronization */ |
| 157 | fd_set fdset; |
| 158 | struct timeval timeout; |
| 159 | |
| 160 | FD_ZERO(&fdset); |
| 161 | FD_SET(audio_fd, &fdset); |
| 162 | timeout.tv_sec = 10; |
| 163 | timeout.tv_usec = 0; |
| 164 | #ifdef DEBUG_AUDIO |
| 165 | fprintf(stderr, "Waiting for audio to get ready\n"); |
| 166 | #endif |
| 167 | if ( select(audio_fd+1, NULL, &fdset, NULL, &timeout) <= 0 ) { |
| 168 | const char *message = |
| 169 | "Audio timeout - buggy audio driver? (disabled)"; |
| 170 | /* In general we should never print to the screen, |
| 171 | but in this case we have no other way of letting |
| 172 | the user know what happened. |
| 173 | */ |
| 174 | fprintf(stderr, "SDL: %s\n", message); |
| 175 | this->enabled = 0; |
| 176 | /* Don't try to close - may hang */ |
| 177 | audio_fd = -1; |
| 178 | #ifdef DEBUG_AUDIO |
| 179 | fprintf(stderr, "Done disabling audio\n"); |
| 180 | #endif |
| 181 | } |
| 182 | #ifdef DEBUG_AUDIO |
| 183 | fprintf(stderr, "Ready!\n"); |
| 184 | #endif |
| 185 | } |
| 186 | #endif /* !USE_BLOCKING_WRITES */ |
| 187 | } |
| 188 | |
| 189 | static void |
| 190 | OBSD_PlayAudio(_THIS) |
| 191 | { |
| 192 | int written, p=0; |
| 193 | |
| 194 | /* Write the audio data, checking for EAGAIN on broken audio drivers */ |
| 195 | do { |
| 196 | written = write(audio_fd, &mixbuf[p], mixlen-p); |
| 197 | if (written>0) |
| 198 | p += written; |
| 199 | if (written == -1 && errno != 0 && errno != EAGAIN && errno != EINTR) |
| 200 | { |
| 201 | /* Non recoverable error has occurred. It should be reported!!! */ |
| 202 | perror("audio"); |
| 203 | break; |
| 204 | } |
| 205 | |
| 206 | if ( p < written || ((written < 0) && ((errno == 0) || (errno == EAGAIN))) ) { |
| 207 | SDL_Delay(1); /* Let a little CPU time go by */ |
| 208 | } |
| 209 | } while ( p < written ); |
| 210 | |
| 211 | /* If timer synchronization is enabled, set the next write frame */ |
| 212 | if ( frame_ticks ) { |
| 213 | next_frame += frame_ticks; |
| 214 | } |
| 215 | |
| 216 | /* If we couldn't write, assume fatal error for now */ |
| 217 | if ( written < 0 ) { |
| 218 | this->enabled = 0; |
| 219 | } |
| 220 | #ifdef DEBUG_AUDIO |
| 221 | fprintf(stderr, "Wrote %d bytes of audio data\n", written); |
| 222 | #endif |
| 223 | } |
| 224 | |
| 225 | static Uint8 |
| 226 | *OBSD_GetAudioBuf(_THIS) |
| 227 | { |
| 228 | return(mixbuf); |
| 229 | } |
| 230 | |
| 231 | static void |
| 232 | OBSD_CloseAudio(_THIS) |
| 233 | { |
| 234 | if(mixbuf != NULL) { |
| 235 | SDL_FreeAudioMem(mixbuf); |
| 236 | mixbuf = NULL; |
| 237 | } |
| 238 | if(audio_fd >= 0) { |
| 239 | close(audio_fd); |
| 240 | audio_fd = -1; |
| 241 | } |
| 242 | } |
| 243 | |
| 244 | #ifdef DEBUG_AUDIO |
| 245 | void |
| 246 | OBSD_Status(_THIS) |
| 247 | { |
| 248 | audio_info_t info; |
| 249 | |
| 250 | if(ioctl(audio_fd, AUDIO_GETINFO, &info) < 0) { |
| 251 | fprintf(stderr,"AUDIO_GETINFO failed.\n"); |
| 252 | return; |
| 253 | } |
| 254 | |
| 255 | fprintf(stderr,"\n" |
| 256 | "[play/record info]\n" |
| 257 | "buffer size : %d bytes\n" |
| 258 | "sample rate : %i Hz\n" |
| 259 | "channels : %i\n" |
| 260 | "precision : %i-bit\n" |
| 261 | "encoding : 0x%x\n" |
| 262 | "seek : %i\n" |
| 263 | "sample count : %i\n" |
| 264 | "EOF count : %i\n" |
| 265 | "paused : %s\n" |
| 266 | "error occured : %s\n" |
| 267 | "waiting : %s\n" |
| 268 | "active : %s\n" |
| 269 | "", |
| 270 | info.play.buffer_size, |
| 271 | info.play.sample_rate, |
| 272 | info.play.channels, |
| 273 | info.play.precision, |
| 274 | info.play.encoding, |
| 275 | info.play.seek, |
| 276 | info.play.samples, |
| 277 | info.play.eof, |
| 278 | info.play.pause ? "yes" : "no", |
| 279 | info.play.error ? "yes" : "no", |
| 280 | info.play.waiting ? "yes" : "no", |
| 281 | info.play.active ? "yes": "no"); |
| 282 | |
| 283 | fprintf(stderr,"\n" |
| 284 | "[audio info]\n" |
| 285 | "monitor_gain : %i\n" |
| 286 | "hw block size : %d bytes\n" |
| 287 | "hi watermark : %i\n" |
| 288 | "lo watermark : %i\n" |
| 289 | "audio mode : %s\n" |
| 290 | "", |
| 291 | info.monitor_gain, |
| 292 | info.blocksize, |
| 293 | info.hiwat, info.lowat, |
| 294 | (info.mode == AUMODE_PLAY) ? "PLAY" |
| 295 | : (info.mode = AUMODE_RECORD) ? "RECORD" |
| 296 | : (info.mode == AUMODE_PLAY_ALL ? "PLAY_ALL" |
| 297 | : "?")); |
| 298 | } |
| 299 | #endif /* DEBUG_AUDIO */ |
| 300 | |
| 301 | static int |
| 302 | OBSD_OpenAudio(_THIS, SDL_AudioSpec *spec) |
| 303 | { |
| 304 | char audiodev[64]; |
| 305 | Uint16 format; |
| 306 | audio_info_t info; |
| 307 | |
| 308 | AUDIO_INITINFO(&info); |
| 309 | |
| 310 | /* Calculate the final parameters for this audio specification */ |
| 311 | SDL_CalculateAudioSpec(spec); |
| 312 | |
| 313 | #ifdef USE_TIMER_SYNC |
| 314 | frame_ticks = 0.0; |
| 315 | #endif |
| 316 | |
| 317 | /* Open the audio device */ |
| 318 | audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0); |
| 319 | if(audio_fd < 0) { |
| 320 | SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); |
| 321 | return(-1); |
| 322 | } |
| 323 | |
| 324 | /* Set to play mode */ |
| 325 | info.mode = AUMODE_PLAY; |
| 326 | if(ioctl(audio_fd, AUDIO_SETINFO, &info) < 0) { |
| 327 | SDL_SetError("Couldn't put device into play mode"); |
| 328 | return(-1); |
| 329 | } |
| 330 | |
| 331 | mixbuf = NULL; |
| 332 | AUDIO_INITINFO(&info); |
| 333 | for (format = SDL_FirstAudioFormat(spec->format); |
| 334 | format; format = SDL_NextAudioFormat()) |
| 335 | { |
| 336 | switch(format) { |
| 337 | case AUDIO_U8: |
| 338 | info.play.encoding = AUDIO_ENCODING_ULINEAR; |
| 339 | info.play.precision = 8; |
| 340 | break; |
| 341 | case AUDIO_S8: |
| 342 | info.play.encoding = AUDIO_ENCODING_SLINEAR; |
| 343 | info.play.precision = 8; |
| 344 | break; |
| 345 | case AUDIO_S16LSB: |
| 346 | info.play.encoding = AUDIO_ENCODING_SLINEAR_LE; |
| 347 | info.play.precision = 16; |
| 348 | break; |
| 349 | case AUDIO_S16MSB: |
| 350 | info.play.encoding = AUDIO_ENCODING_SLINEAR_BE; |
| 351 | info.play.precision = 16; |
| 352 | break; |
| 353 | case AUDIO_U16LSB: |
| 354 | info.play.encoding = AUDIO_ENCODING_ULINEAR_LE; |
| 355 | info.play.precision = 16; |
| 356 | break; |
| 357 | case AUDIO_U16MSB: |
| 358 | info.play.encoding = AUDIO_ENCODING_ULINEAR_BE; |
| 359 | info.play.precision = 16; |
| 360 | break; |
| 361 | default: |
| 362 | continue; |
| 363 | } |
| 364 | if (ioctl(audio_fd, AUDIO_SETINFO, &info) == 0) |
| 365 | break; |
| 366 | } |
| 367 | |
| 368 | if(!format) { |
| 369 | SDL_SetError("No supported encoding for 0x%x", spec->format); |
| 370 | return(-1); |
| 371 | } |
| 372 | |
| 373 | spec->format = format; |
| 374 | |
| 375 | AUDIO_INITINFO(&info); |
| 376 | info.play.channels = spec->channels; |
| 377 | if (ioctl(audio_fd, AUDIO_SETINFO, &info) == -1) |
| 378 | spec->channels = 1; |
| 379 | AUDIO_INITINFO(&info); |
| 380 | info.play.sample_rate = spec->freq; |
| 381 | info.blocksize = spec->size; |
| 382 | info.hiwat = 5; |
| 383 | info.lowat = 3; |
| 384 | (void)ioctl(audio_fd, AUDIO_SETINFO, &info); |
| 385 | (void)ioctl(audio_fd, AUDIO_GETINFO, &info); |
| 386 | spec->freq = info.play.sample_rate; |
| 387 | /* Allocate mixing buffer */ |
| 388 | mixlen = spec->size; |
| 389 | mixbuf = (Uint8*)SDL_AllocAudioMem(mixlen); |
| 390 | if(mixbuf == NULL) { |
| 391 | return(-1); |
| 392 | } |
| 393 | SDL_memset(mixbuf, spec->silence, spec->size); |
| 394 | |
| 395 | /* Get the parent process id (we're the parent of the audio thread) */ |
| 396 | parent = getpid(); |
| 397 | |
| 398 | #ifdef DEBUG_AUDIO |
| 399 | OBSD_Status(this); |
| 400 | #endif |
| 401 | |
| 402 | /* We're ready to rock and roll. :-) */ |
| 403 | return(0); |
| 404 | } |