| 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 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@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 | |