1 /* 2 SDL - Simple DirectMedia Layer 3 Copyright (C) 1997-2006 Sam Lantinga 4 5 This library is free software; you can redistribute it and/or 6 modify it under the terms of the GNU Lesser General Public 7 License as published by the Free Software Foundation; either 8 version 2.1 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 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public 16 License along with this library; if not, write to the Free Software 17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 18 19 Carsten Griwodz 20 griff (at) kom.tu-darmstadt.de 21 22 based on linux/SDL_dspaudio.c by Sam Lantinga 23 */ 24 #include "SDL_config.h" 25 26 /* Allow access to a raw mixing buffer */ 27 28 #include <errno.h> 29 #include <unistd.h> 30 #include <fcntl.h> 31 #include <sys/time.h> 32 #include <sys/ioctl.h> 33 #include <sys/stat.h> 34 35 #include "SDL_timer.h" 36 #include "SDL_audio.h" 37 #include "../SDL_audiomem.h" 38 #include "../SDL_audio_c.h" 39 #include "../SDL_audiodev_c.h" 40 #include "SDL_paudio.h" 41 42 #define DEBUG_AUDIO 1 43 44 /* A conflict within AIX 4.3.3 <sys/> headers and probably others as well. 45 * I guess nobody ever uses audio... Shame over AIX header files. */ 46 #include <sys/machine.h> 47 #undef BIG_ENDIAN 48 #include <sys/audio.h> 49 50 /* The tag name used by paud audio */ 51 #define Paud_DRIVER_NAME "paud" 52 53 /* Open the audio device for playback, and don't block if busy */ 54 /* #define OPEN_FLAGS (O_WRONLY|O_NONBLOCK) */ 55 #define OPEN_FLAGS O_WRONLY 56 57 /* Audio driver functions */ 58 static int Paud_OpenAudio(_THIS, SDL_AudioSpec *spec); 59 static void Paud_WaitAudio(_THIS); 60 static void Paud_PlayAudio(_THIS); 61 static Uint8 *Paud_GetAudioBuf(_THIS); 62 static void Paud_CloseAudio(_THIS); 63 64 /* Audio driver bootstrap functions */ 65 66 static int Audio_Available(void) 67 { 68 int fd; 69 int available; 70 71 available = 0; 72 fd = SDL_OpenAudioPath(NULL, 0, OPEN_FLAGS, 0); 73 if ( fd >= 0 ) { 74 available = 1; 75 close(fd); 76 } 77 return(available); 78 } 79 80 static void Audio_DeleteDevice(SDL_AudioDevice *device) 81 { 82 SDL_free(device->hidden); 83 SDL_free(device); 84 } 85 86 static SDL_AudioDevice *Audio_CreateDevice(int devindex) 87 { 88 SDL_AudioDevice *this; 89 90 /* Initialize all variables that we clean on shutdown */ 91 this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); 92 if ( this ) { 93 SDL_memset(this, 0, (sizeof *this)); 94 this->hidden = (struct SDL_PrivateAudioData *) 95 SDL_malloc((sizeof *this->hidden)); 96 } 97 if ( (this == NULL) || (this->hidden == NULL) ) { 98 SDL_OutOfMemory(); 99 if ( this ) { 100 SDL_free(this); 101 } 102 return(0); 103 } 104 SDL_memset(this->hidden, 0, (sizeof *this->hidden)); 105 audio_fd = -1; 106 107 /* Set the function pointers */ 108 this->OpenAudio = Paud_OpenAudio; 109 this->WaitAudio = Paud_WaitAudio; 110 this->PlayAudio = Paud_PlayAudio; 111 this->GetAudioBuf = Paud_GetAudioBuf; 112 this->CloseAudio = Paud_CloseAudio; 113 114 this->free = Audio_DeleteDevice; 115 116 return this; 117 } 118 119 AudioBootStrap Paud_bootstrap = { 120 Paud_DRIVER_NAME, "AIX Paudio", 121 Audio_Available, Audio_CreateDevice 122 }; 123 124 /* This function waits until it is possible to write a full sound buffer */ 125 static void Paud_WaitAudio(_THIS) 126 { 127 fd_set fdset; 128 129 /* See if we need to use timed audio synchronization */ 130 if ( frame_ticks ) { 131 /* Use timer for general audio synchronization */ 132 Sint32 ticks; 133 134 ticks = ((Sint32)(next_frame - SDL_GetTicks()))-FUDGE_TICKS; 135 if ( ticks > 0 ) { 136 SDL_Delay(ticks); 137 } 138 } else { 139 audio_buffer paud_bufinfo; 140 141 /* Use select() for audio synchronization */ 142 struct timeval timeout; 143 FD_ZERO(&fdset); 144 FD_SET(audio_fd, &fdset); 145 146 if ( ioctl(audio_fd, AUDIO_BUFFER, &paud_bufinfo) < 0 ) { 147 #ifdef DEBUG_AUDIO 148 fprintf(stderr, "Couldn't get audio buffer information\n"); 149 #endif 150 timeout.tv_sec = 10; 151 timeout.tv_usec = 0; 152 } else { 153 long ms_in_buf = paud_bufinfo.write_buf_time; 154 timeout.tv_sec = ms_in_buf/1000; 155 ms_in_buf = ms_in_buf - timeout.tv_sec*1000; 156 timeout.tv_usec = ms_in_buf*1000; 157 #ifdef DEBUG_AUDIO 158 fprintf( stderr, 159 "Waiting for write_buf_time=%ld,%ld\n", 160 timeout.tv_sec, 161 timeout.tv_usec ); 162 #endif 163 } 164 165 #ifdef DEBUG_AUDIO 166 fprintf(stderr, "Waiting for audio to get ready\n"); 167 #endif 168 if ( select(audio_fd+1, NULL, &fdset, NULL, &timeout) <= 0 ) { 169 const char *message = "Audio timeout - buggy audio driver? (disabled)"; 170 /* 171 * In general we should never print to the screen, 172 * but in this case we have no other way of letting 173 * the user know what happened. 174 */ 175 fprintf(stderr, "SDL: %s - %s\n", strerror(errno), message); 176 this->enabled = 0; 177 /* Don't try to close - may hang */ 178 audio_fd = -1; 179 #ifdef DEBUG_AUDIO 180 fprintf(stderr, "Done disabling audio\n"); 181 #endif 182 } 183 #ifdef DEBUG_AUDIO 184 fprintf(stderr, "Ready!\n"); 185 #endif 186 } 187 } 188 189 static void Paud_PlayAudio(_THIS) 190 { 191 int written; 192 193 /* Write the audio data, checking for EAGAIN on broken audio drivers */ 194 do { 195 written = write(audio_fd, mixbuf, mixlen); 196 if ( (written < 0) && ((errno == 0) || (errno == EAGAIN)) ) { 197 SDL_Delay(1); /* Let a little CPU time go by */ 198 } 199 } while ( (written < 0) && 200 ((errno == 0) || (errno == EAGAIN) || (errno == EINTR)) ); 201 202 /* If timer synchronization is enabled, set the next write frame */ 203 if ( frame_ticks ) { 204 next_frame += frame_ticks; 205 } 206 207 /* If we couldn't write, assume fatal error for now */ 208 if ( written < 0 ) { 209 this->enabled = 0; 210 } 211 #ifdef DEBUG_AUDIO 212 fprintf(stderr, "Wrote %d bytes of audio data\n", written); 213 #endif 214 } 215 216 static Uint8 *Paud_GetAudioBuf(_THIS) 217 { 218 return mixbuf; 219 } 220 221 static void Paud_CloseAudio(_THIS) 222 { 223 if ( mixbuf != NULL ) { 224 SDL_FreeAudioMem(mixbuf); 225 mixbuf = NULL; 226 } 227 if ( audio_fd >= 0 ) { 228 close(audio_fd); 229 audio_fd = -1; 230 } 231 } 232 233 static int Paud_OpenAudio(_THIS, SDL_AudioSpec *spec) 234 { 235 char audiodev[1024]; 236 int format; 237 int bytes_per_sample; 238 Uint16 test_format; 239 audio_init paud_init; 240 audio_buffer paud_bufinfo; 241 audio_status paud_status; 242 audio_control paud_control; 243 audio_change paud_change; 244 245 /* Reset the timer synchronization flag */ 246 frame_ticks = 0.0; 247 248 /* Open the audio device */ 249 audio_fd = SDL_OpenAudioPath(audiodev, sizeof(audiodev), OPEN_FLAGS, 0); 250 if ( audio_fd < 0 ) { 251 SDL_SetError("Couldn't open %s: %s", audiodev, strerror(errno)); 252 return -1; 253 } 254 255 /* 256 * We can't set the buffer size - just ask the device for the maximum 257 * that we can have. 258 */ 259 if ( ioctl(audio_fd, AUDIO_BUFFER, &paud_bufinfo) < 0 ) { 260 SDL_SetError("Couldn't get audio buffer information"); 261 return -1; 262 } 263 264 mixbuf = NULL; 265 266 if ( spec->channels > 1 ) 267 spec->channels = 2; 268 else 269 spec->channels = 1; 270 271 /* 272 * Fields in the audio_init structure: 273 * 274 * Ignored by us: 275 * 276 * paud.loadpath[LOAD_PATH]; * DSP code to load, MWave chip only? 277 * paud.slot_number; * slot number of the adapter 278 * paud.device_id; * adapter identification number 279 * 280 * Input: 281 * 282 * paud.srate; * the sampling rate in Hz 283 * paud.bits_per_sample; * 8, 16, 32, ... 284 * paud.bsize; * block size for this rate 285 * paud.mode; * ADPCM, PCM, MU_LAW, A_LAW, SOURCE_MIX 286 * paud.channels; * 1=mono, 2=stereo 287 * paud.flags; * FIXED - fixed length data 288 * * LEFT_ALIGNED, RIGHT_ALIGNED (var len only) 289 * * TWOS_COMPLEMENT - 2's complement data 290 * * SIGNED - signed? comment seems wrong in sys/audio.h 291 * * BIG_ENDIAN 292 * paud.operation; * PLAY, RECORD 293 * 294 * Output: 295 * 296 * paud.flags; * PITCH - pitch is supported 297 * * INPUT - input is supported 298 * * OUTPUT - output is supported 299 * * MONITOR - monitor is supported 300 * * VOLUME - volume is supported 301 * * VOLUME_DELAY - volume delay is supported 302 * * BALANCE - balance is supported 303 * * BALANCE_DELAY - balance delay is supported 304 * * TREBLE - treble control is supported 305 * * BASS - bass control is supported 306 * * BESTFIT_PROVIDED - best fit returned 307 * * LOAD_CODE - DSP load needed 308 * paud.rc; * NO_PLAY - DSP code can't do play requests 309 * * NO_RECORD - DSP code can't do record requests 310 * * INVALID_REQUEST - request was invalid 311 * * CONFLICT - conflict with open's flags 312 * * OVERLOADED - out of DSP MIPS or memory 313 * paud.position_resolution; * smallest increment for position 314 */ 315 316 paud_init.srate = spec->freq; 317 paud_init.mode = PCM; 318 paud_init.operation = PLAY; 319 paud_init.channels = spec->channels; 320 321 /* Try for a closest match on audio format */ 322 format = 0; 323 for ( test_format = SDL_FirstAudioFormat(spec->format); 324 ! format && test_format; ) { 325 #ifdef DEBUG_AUDIO 326 fprintf(stderr, "Trying format 0x%4.4x\n", test_format); 327 #endif 328 switch ( test_format ) { 329 case AUDIO_U8: 330 bytes_per_sample = 1; 331 paud_init.bits_per_sample = 8; 332 paud_init.flags = TWOS_COMPLEMENT | FIXED; 333 format = 1; 334 break; 335 case AUDIO_S8: 336 bytes_per_sample = 1; 337 paud_init.bits_per_sample = 8; 338 paud_init.flags = SIGNED | 339 TWOS_COMPLEMENT | FIXED; 340 format = 1; 341 break; 342 case AUDIO_S16LSB: 343 bytes_per_sample = 2; 344 paud_init.bits_per_sample = 16; 345 paud_init.flags = SIGNED | 346 TWOS_COMPLEMENT | FIXED; 347 format = 1; 348 break; 349 case AUDIO_S16MSB: 350 bytes_per_sample = 2; 351 paud_init.bits_per_sample = 16; 352 paud_init.flags = BIG_ENDIAN | 353 SIGNED | 354 TWOS_COMPLEMENT | FIXED; 355 format = 1; 356 break; 357 case AUDIO_U16LSB: 358 bytes_per_sample = 2; 359 paud_init.bits_per_sample = 16; 360 paud_init.flags = TWOS_COMPLEMENT | FIXED; 361 format = 1; 362 break; 363 case AUDIO_U16MSB: 364 bytes_per_sample = 2; 365 paud_init.bits_per_sample = 16; 366 paud_init.flags = BIG_ENDIAN | 367 TWOS_COMPLEMENT | FIXED; 368 format = 1; 369 break; 370 default: 371 break; 372 } 373 if ( ! format ) { 374 test_format = SDL_NextAudioFormat(); 375 } 376 } 377 if ( format == 0 ) { 378 #ifdef DEBUG_AUDIO 379 fprintf(stderr, "Couldn't find any hardware audio formats\n"); 380 #endif 381 SDL_SetError("Couldn't find any hardware audio formats"); 382 return -1; 383 } 384 spec->format = test_format; 385 386 /* 387 * We know the buffer size and the max number of subsequent writes 388 * that can be pending. If more than one can pend, allow the application 389 * to do something like double buffering between our write buffer and 390 * the device's own buffer that we are filling with write() anyway. 391 * 392 * We calculate spec->samples like this because SDL_CalculateAudioSpec() 393 * will give put paud_bufinfo.write_buf_cap (or paud_bufinfo.write_buf_cap/2) 394 * into spec->size in return. 395 */ 396 if ( paud_bufinfo.request_buf_cap == 1 ) 397 { 398 spec->samples = paud_bufinfo.write_buf_cap 399 / bytes_per_sample 400 / spec->channels; 401 } 402 else 403 { 404 spec->samples = paud_bufinfo.write_buf_cap 405 / bytes_per_sample 406 / spec->channels 407 / 2; 408 } 409 paud_init.bsize = bytes_per_sample * spec->channels; 410 411 SDL_CalculateAudioSpec(spec); 412 413 /* 414 * The AIX paud device init can't modify the values of the audio_init 415 * structure that we pass to it. So we don't need any recalculation 416 * of this stuff and no reinit call as in linux dsp and dma code. 417 * 418 * /dev/paud supports all of the encoding formats, so we don't need 419 * to do anything like reopening the device, either. 420 */ 421 if ( ioctl(audio_fd, AUDIO_INIT, &paud_init) < 0 ) { 422 switch ( paud_init.rc ) 423 { 424 case 1 : 425 SDL_SetError("Couldn't set audio format: DSP can't do play requests"); 426 return -1; 427 break; 428 case 2 : 429 SDL_SetError("Couldn't set audio format: DSP can't do record requests"); 430 return -1; 431 break; 432 case 4 : 433 SDL_SetError("Couldn't set audio format: request was invalid"); 434 return -1; 435 break; 436 case 5 : 437 SDL_SetError("Couldn't set audio format: conflict with open's flags"); 438 return -1; 439 break; 440 case 6 : 441 SDL_SetError("Couldn't set audio format: out of DSP MIPS or memory"); 442 return -1; 443 break; 444 default : 445 SDL_SetError("Couldn't set audio format: not documented in sys/audio.h"); 446 return -1; 447 break; 448 } 449 } 450 451 /* Allocate mixing buffer */ 452 mixlen = spec->size; 453 mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); 454 if ( mixbuf == NULL ) { 455 return -1; 456 } 457 SDL_memset(mixbuf, spec->silence, spec->size); 458 459 /* 460 * Set some paramters: full volume, first speaker that we can find. 461 * Ignore the other settings for now. 462 */ 463 paud_change.input = AUDIO_IGNORE; /* the new input source */ 464 paud_change.output = OUTPUT_1; /* EXTERNAL_SPEAKER,INTERNAL_SPEAKER,OUTPUT_1 */ 465 paud_change.monitor = AUDIO_IGNORE; /* the new monitor state */ 466 paud_change.volume = 0x7fffffff; /* volume level [0-0x7fffffff] */ 467 paud_change.volume_delay = AUDIO_IGNORE; /* the new volume delay */ 468 paud_change.balance = 0x3fffffff; /* the new balance */ 469 paud_change.balance_delay = AUDIO_IGNORE; /* the new balance delay */ 470 paud_change.treble = AUDIO_IGNORE; /* the new treble state */ 471 paud_change.bass = AUDIO_IGNORE; /* the new bass state */ 472 paud_change.pitch = AUDIO_IGNORE; /* the new pitch state */ 473 474 paud_control.ioctl_request = AUDIO_CHANGE; 475 paud_control.request_info = (char*)&paud_change; 476 if ( ioctl(audio_fd, AUDIO_CONTROL, &paud_control) < 0 ) { 477 #ifdef DEBUG_AUDIO 478 fprintf(stderr, "Can't change audio display settings\n" ); 479 #endif 480 } 481 482 /* 483 * Tell the device to expect data. Actual start will wait for 484 * the first write() call. 485 */ 486 paud_control.ioctl_request = AUDIO_START; 487 paud_control.position = 0; 488 if ( ioctl(audio_fd, AUDIO_CONTROL, &paud_control) < 0 ) { 489 #ifdef DEBUG_AUDIO 490 fprintf(stderr, "Can't start audio play\n" ); 491 #endif 492 SDL_SetError("Can't start audio play"); 493 return -1; 494 } 495 496 /* Check to see if we need to use select() workaround */ 497 { char *workaround; 498 workaround = SDL_getenv("SDL_DSP_NOSELECT"); 499 if ( workaround ) { 500 frame_ticks = (float)(spec->samples*1000)/spec->freq; 501 next_frame = SDL_GetTicks()+frame_ticks; 502 } 503 } 504 505 /* Get the parent process id (we're the parent of the audio thread) */ 506 parent = getpid(); 507 508 /* We're ready to rock and roll. :-) */ 509 return 0; 510 } 511 512
