| 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 | #include <errno.h> |
| 25 | #include <unistd.h> |
| 26 | #include <fcntl.h> |
| 27 | #include <signal.h> |
| 28 | #include <sys/types.h> |
| 29 | #include <sys/time.h> |
| 30 | #include <sched.h> |
| 31 | #include <sys/select.h> |
| 32 | #include <sys/neutrino.h> |
| 33 | #include <sys/asoundlib.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_nto_audio.h" |
| 40 | |
| 41 | /* The tag name used by NTO audio */ |
| 42 | #define DRIVER_NAME "qsa-nto" |
| 43 | |
| 44 | /* default channel communication parameters */ |
| 45 | #define DEFAULT_CPARAMS_RATE 22050 |
| 46 | #define DEFAULT_CPARAMS_VOICES 1 |
| 47 | /* FIXME: need to add in the near future flexible logic with frag_size and frags count */ |
| 48 | #define DEFAULT_CPARAMS_FRAG_SIZE 4096 |
| 49 | #define DEFAULT_CPARAMS_FRAGS_MIN 1 |
| 50 | #define DEFAULT_CPARAMS_FRAGS_MAX 1 |
| 51 | |
| 52 | /* Open the audio device for playback, and don't block if busy */ |
| 53 | #define OPEN_FLAGS SND_PCM_OPEN_PLAYBACK |
| 54 | |
| 55 | #define QSA_NO_WORKAROUNDS 0x00000000 |
| 56 | #define QSA_MMAP_WORKAROUND 0x00000001 |
| 57 | |
| 58 | struct BuggyCards |
| 59 | { |
| 60 | char* cardname; |
| 61 | unsigned long bugtype; |
| 62 | }; |
| 63 | |
| 64 | #define QSA_WA_CARDS 3 |
| 65 | |
| 66 | struct BuggyCards buggycards[QSA_WA_CARDS]= |
| 67 | { |
| 68 | {"Sound Blaster Live!", QSA_MMAP_WORKAROUND}, |
| 69 | {"Vortex 8820", QSA_MMAP_WORKAROUND}, |
| 70 | {"Vortex 8830", QSA_MMAP_WORKAROUND}, |
| 71 | }; |
| 72 | |
| 73 | /* Audio driver functions */ |
| 74 | static void NTO_ThreadInit(_THIS); |
| 75 | static int NTO_OpenAudio(_THIS, SDL_AudioSpec* spec); |
| 76 | static void NTO_WaitAudio(_THIS); |
| 77 | static void NTO_PlayAudio(_THIS); |
| 78 | static Uint8* NTO_GetAudioBuf(_THIS); |
| 79 | static void NTO_CloseAudio(_THIS); |
| 80 | |
| 81 | /* card names check to apply the workarounds */ |
| 82 | static int NTO_CheckBuggyCards(_THIS, unsigned long checkfor) |
| 83 | { |
| 84 | char scardname[33]; |
| 85 | int it; |
| 86 | |
| 87 | if (snd_card_get_name(cardno, scardname, 32)<0) |
| 88 | { |
| 89 | return 0; |
| 90 | } |
| 91 | |
| 92 | for (it=0; it<QSA_WA_CARDS; it++) |
| 93 | { |
| 94 | if (SDL_strcmp(buggycards[it].cardname, scardname)==0) |
| 95 | { |
| 96 | if (buggycards[it].bugtype==checkfor) |
| 97 | { |
| 98 | return 1; |
| 99 | } |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | return 0; |
| 104 | } |
| 105 | |
| 106 | static void NTO_ThreadInit(_THIS) |
| 107 | { |
| 108 | int status; |
| 109 | struct sched_param param; |
| 110 | |
| 111 | /* increasing default 10 priority to 25 to avoid jerky sound */ |
| 112 | status=SchedGet(0, 0, ¶m); |
| 113 | param.sched_priority=param.sched_curpriority+15; |
| 114 | status=SchedSet(0, 0, SCHED_NOCHANGE, ¶m); |
| 115 | } |
| 116 | |
| 117 | /* PCM transfer channel parameters initialize function */ |
| 118 | static void NTO_InitAudioParams(snd_pcm_channel_params_t* cpars) |
| 119 | { |
| 120 | SDL_memset(cpars, 0, sizeof(snd_pcm_channel_params_t)); |
| 121 | |
| 122 | cpars->channel = SND_PCM_CHANNEL_PLAYBACK; |
| 123 | cpars->mode = SND_PCM_MODE_BLOCK; |
| 124 | cpars->start_mode = SND_PCM_START_DATA; |
| 125 | cpars->stop_mode = SND_PCM_STOP_STOP; |
| 126 | cpars->format.format = SND_PCM_SFMT_S16_LE; |
| 127 | cpars->format.interleave = 1; |
| 128 | cpars->format.rate = DEFAULT_CPARAMS_RATE; |
| 129 | cpars->format.voices = DEFAULT_CPARAMS_VOICES; |
| 130 | cpars->buf.block.frag_size = DEFAULT_CPARAMS_FRAG_SIZE; |
| 131 | cpars->buf.block.frags_min = DEFAULT_CPARAMS_FRAGS_MIN; |
| 132 | cpars->buf.block.frags_max = DEFAULT_CPARAMS_FRAGS_MAX; |
| 133 | } |
| 134 | |
| 135 | static int NTO_AudioAvailable(void) |
| 136 | { |
| 137 | /* See if we can open a nonblocking channel. |
| 138 | Return value '1' means we can. |
| 139 | Return value '0' means we cannot. */ |
| 140 | |
| 141 | int available; |
| 142 | int rval; |
| 143 | snd_pcm_t* handle; |
| 144 | |
| 145 | available = 0; |
| 146 | handle = NULL; |
| 147 | |
| 148 | rval = snd_pcm_open_preferred(&handle, NULL, NULL, OPEN_FLAGS); |
| 149 | |
| 150 | if (rval >= 0) |
| 151 | { |
| 152 | available = 1; |
| 153 | |
| 154 | if ((rval = snd_pcm_close(handle)) < 0) |
| 155 | { |
| 156 | SDL_SetError("NTO_AudioAvailable(): snd_pcm_close failed: %s\n", snd_strerror(rval)); |
| 157 | available = 0; |
| 158 | } |
| 159 | } |
| 160 | else |
| 161 | { |
| 162 | SDL_SetError("NTO_AudioAvailable(): there are no available audio devices.\n"); |
| 163 | } |
| 164 | |
| 165 | return (available); |
| 166 | } |
| 167 | |
| 168 | static void NTO_DeleteAudioDevice(SDL_AudioDevice *device) |
| 169 | { |
| 170 | if ((device)&&(device->hidden)) |
| 171 | { |
| 172 | SDL_free(device->hidden); |
| 173 | } |
| 174 | if (device) |
| 175 | { |
| 176 | SDL_free(device); |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | static SDL_AudioDevice* NTO_CreateAudioDevice(int devindex) |
| 181 | { |
| 182 | SDL_AudioDevice *this; |
| 183 | |
| 184 | /* Initialize all variables that we clean on shutdown */ |
| 185 | this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); |
| 186 | if (this) |
| 187 | { |
| 188 | SDL_memset(this, 0, sizeof(SDL_AudioDevice)); |
| 189 | this->hidden = (struct SDL_PrivateAudioData *)SDL_malloc(sizeof(struct SDL_PrivateAudioData)); |
| 190 | } |
| 191 | if ((this == NULL) || (this->hidden == NULL)) |
| 192 | { |
| 193 | SDL_OutOfMemory(); |
| 194 | if (this) |
| 195 | { |
| 196 | SDL_free(this); |
| 197 | } |
| 198 | return (0); |
| 199 | } |
| 200 | SDL_memset(this->hidden, 0, sizeof(struct SDL_PrivateAudioData)); |
| 201 | audio_handle = NULL; |
| 202 | |
| 203 | /* Set the function pointers */ |
| 204 | this->ThreadInit = NTO_ThreadInit; |
| 205 | this->OpenAudio = NTO_OpenAudio; |
| 206 | this->WaitAudio = NTO_WaitAudio; |
| 207 | this->PlayAudio = NTO_PlayAudio; |
| 208 | this->GetAudioBuf = NTO_GetAudioBuf; |
| 209 | this->CloseAudio = NTO_CloseAudio; |
| 210 | |
| 211 | this->free = NTO_DeleteAudioDevice; |
| 212 | |
| 213 | return this; |
| 214 | } |
| 215 | |
| 216 | AudioBootStrap QNXNTOAUDIO_bootstrap = |
| 217 | { |
| 218 | DRIVER_NAME, "QNX6 QSA-NTO Audio", |
| 219 | NTO_AudioAvailable, |
| 220 | NTO_CreateAudioDevice |
| 221 | }; |
| 222 | |
| 223 | /* This function waits until it is possible to write a full sound buffer */ |
| 224 | static void NTO_WaitAudio(_THIS) |
| 225 | { |
| 226 | fd_set wfds; |
| 227 | int selectret; |
| 228 | |
| 229 | FD_ZERO(&wfds); |
| 230 | FD_SET(audio_fd, &wfds); |
| 231 | |
| 232 | do { |
| 233 | selectret=select(audio_fd + 1, NULL, &wfds, NULL, NULL); |
| 234 | switch (selectret) |
| 235 | { |
| 236 | case -1: |
| 237 | case 0: SDL_SetError("NTO_WaitAudio(): select() failed: %s\n", strerror(errno)); |
| 238 | return; |
| 239 | default: if (FD_ISSET(audio_fd, &wfds)) |
| 240 | { |
| 241 | return; |
| 242 | } |
| 243 | break; |
| 244 | } |
| 245 | } while(1); |
| 246 | } |
| 247 | |
| 248 | static void NTO_PlayAudio(_THIS) |
| 249 | { |
| 250 | int written, rval; |
| 251 | int towrite; |
| 252 | void* pcmbuffer; |
| 253 | |
| 254 | if (!this->enabled) |
| 255 | { |
| 256 | return; |
| 257 | } |
| 258 | |
| 259 | towrite = this->spec.size; |
| 260 | pcmbuffer = pcm_buf; |
| 261 | |
| 262 | /* Write the audio data, checking for EAGAIN (buffer full) and underrun */ |
| 263 | do { |
| 264 | written = snd_pcm_plugin_write(audio_handle, pcm_buf, towrite); |
| 265 | if (written != towrite) |
| 266 | { |
| 267 | if ((errno == EAGAIN) || (errno == EWOULDBLOCK)) |
| 268 | { |
| 269 | /* Let a little CPU time go by and try to write again */ |
| 270 | SDL_Delay(1); |
| 271 | /* if we wrote some data */ |
| 272 | towrite -= written; |
| 273 | pcmbuffer += written * this->spec.channels; |
| 274 | continue; |
| 275 | } |
| 276 | else |
| 277 | { |
| 278 | if ((errno == EINVAL) || (errno == EIO)) |
| 279 | { |
| 280 | SDL_memset(&cstatus, 0, sizeof(cstatus)); |
| 281 | cstatus.channel = SND_PCM_CHANNEL_PLAYBACK; |
| 282 | if ((rval = snd_pcm_plugin_status(audio_handle, &cstatus)) < 0) |
| 283 | { |
| 284 | SDL_SetError("NTO_PlayAudio(): snd_pcm_plugin_status failed: %s\n", snd_strerror(rval)); |
| 285 | return; |
| 286 | } |
| 287 | if ((cstatus.status == SND_PCM_STATUS_UNDERRUN) || (cstatus.status == SND_PCM_STATUS_READY)) |
| 288 | { |
| 289 | if ((rval = snd_pcm_plugin_prepare(audio_handle, SND_PCM_CHANNEL_PLAYBACK)) < 0) |
| 290 | { |
| 291 | SDL_SetError("NTO_PlayAudio(): snd_pcm_plugin_prepare failed: %s\n", snd_strerror(rval)); |
| 292 | return; |
| 293 | } |
| 294 | } |
| 295 | continue; |
| 296 | } |
| 297 | else |
| 298 | { |
| 299 | return; |
| 300 | } |
| 301 | } |
| 302 | } |
| 303 | else |
| 304 | { |
| 305 | /* we wrote all remaining data */ |
| 306 | towrite -= written; |
| 307 | pcmbuffer += written * this->spec.channels; |
| 308 | } |
| 309 | } while ((towrite > 0) && (this->enabled)); |
| 310 | |
| 311 | /* If we couldn't write, assume fatal error for now */ |
| 312 | if (towrite != 0) |
| 313 | { |
| 314 | this->enabled = 0; |
| 315 | } |
| 316 | |
| 317 | return; |
| 318 | } |
| 319 | |
| 320 | static Uint8* NTO_GetAudioBuf(_THIS) |
| 321 | { |
| 322 | return pcm_buf; |
| 323 | } |
| 324 | |
| 325 | static void NTO_CloseAudio(_THIS) |
| 326 | { |
| 327 | int rval; |
| 328 | |
| 329 | this->enabled = 0; |
| 330 | |
| 331 | if (audio_handle != NULL) |
| 332 | { |
| 333 | if ((rval = snd_pcm_plugin_flush(audio_handle, SND_PCM_CHANNEL_PLAYBACK)) < 0) |
| 334 | { |
| 335 | SDL_SetError("NTO_CloseAudio(): snd_pcm_plugin_flush failed: %s\n", snd_strerror(rval)); |
| 336 | return; |
| 337 | } |
| 338 | if ((rval = snd_pcm_close(audio_handle)) < 0) |
| 339 | { |
| 340 | SDL_SetError("NTO_CloseAudio(): snd_pcm_close failed: %s\n",snd_strerror(rval)); |
| 341 | return; |
| 342 | } |
| 343 | audio_handle = NULL; |
| 344 | } |
| 345 | } |
| 346 | |
| 347 | static int NTO_OpenAudio(_THIS, SDL_AudioSpec* spec) |
| 348 | { |
| 349 | int rval; |
| 350 | int format; |
| 351 | Uint16 test_format; |
| 352 | int found; |
| 353 | |
| 354 | audio_handle = NULL; |
| 355 | this->enabled = 0; |
| 356 | |
| 357 | if (pcm_buf != NULL) |
| 358 | { |
| 359 | SDL_FreeAudioMem(pcm_buf); |
| 360 | pcm_buf = NULL; |
| 361 | } |
| 362 | |
| 363 | /* initialize channel transfer parameters to default */ |
| 364 | NTO_InitAudioParams(&cparams); |
| 365 | |
| 366 | /* Open the audio device */ |
| 367 | rval = snd_pcm_open_preferred(&audio_handle, &cardno, &deviceno, OPEN_FLAGS); |
| 368 | if (rval < 0) |
| 369 | { |
| 370 | SDL_SetError("NTO_OpenAudio(): snd_pcm_open failed: %s\n", snd_strerror(rval)); |
| 371 | return (-1); |
| 372 | } |
| 373 | |
| 374 | if (!NTO_CheckBuggyCards(this, QSA_MMAP_WORKAROUND)) |
| 375 | { |
| 376 | /* enable count status parameter */ |
| 377 | if ((rval = snd_pcm_plugin_set_disable(audio_handle, PLUGIN_DISABLE_MMAP)) < 0) |
| 378 | { |
| 379 | SDL_SetError("snd_pcm_plugin_set_disable failed: %s\n", snd_strerror(rval)); |
| 380 | return (-1); |
| 381 | } |
| 382 | } |
| 383 | |
| 384 | /* Try for a closest match on audio format */ |
| 385 | format = 0; |
| 386 | /* can't use format as SND_PCM_SFMT_U8 = 0 in nto */ |
| 387 | found = 0; |
| 388 | |
| 389 | for (test_format=SDL_FirstAudioFormat(spec->format); !found ;) |
| 390 | { |
| 391 | /* if match found set format to equivalent ALSA format */ |
| 392 | switch (test_format) |
| 393 | { |
| 394 | case AUDIO_U8: |
| 395 | format = SND_PCM_SFMT_U8; |
| 396 | found = 1; |
| 397 | break; |
| 398 | case AUDIO_S8: |
| 399 | format = SND_PCM_SFMT_S8; |
| 400 | found = 1; |
| 401 | break; |
| 402 | case AUDIO_S16LSB: |
| 403 | format = SND_PCM_SFMT_S16_LE; |
| 404 | found = 1; |
| 405 | break; |
| 406 | case AUDIO_S16MSB: |
| 407 | format = SND_PCM_SFMT_S16_BE; |
| 408 | found = 1; |
| 409 | break; |
| 410 | case AUDIO_U16LSB: |
| 411 | format = SND_PCM_SFMT_U16_LE; |
| 412 | found = 1; |
| 413 | break; |
| 414 | case AUDIO_U16MSB: |
| 415 | format = SND_PCM_SFMT_U16_BE; |
| 416 | found = 1; |
| 417 | break; |
| 418 | default: |
| 419 | break; |
| 420 | } |
| 421 | |
| 422 | if (!found) |
| 423 | { |
| 424 | test_format = SDL_NextAudioFormat(); |
| 425 | } |
| 426 | } |
| 427 | |
| 428 | /* assumes test_format not 0 on success */ |
| 429 | if (test_format == 0) |
| 430 | { |
| 431 | SDL_SetError("NTO_OpenAudio(): Couldn't find any hardware audio formats"); |
| 432 | return (-1); |
| 433 | } |
| 434 | |
| 435 | spec->format = test_format; |
| 436 | |
| 437 | /* Set the audio format */ |
| 438 | cparams.format.format = format; |
| 439 | |
| 440 | /* Set mono or stereo audio (currently only two channels supported) */ |
| 441 | cparams.format.voices = spec->channels; |
| 442 | |
| 443 | /* Set rate */ |
| 444 | cparams.format.rate = spec->freq; |
| 445 | |
| 446 | /* Setup the transfer parameters according to cparams */ |
| 447 | rval = snd_pcm_plugin_params(audio_handle, &cparams); |
| 448 | if (rval < 0) |
| 449 | { |
| 450 | SDL_SetError("NTO_OpenAudio(): snd_pcm_channel_params failed: %s\n", snd_strerror(rval)); |
| 451 | return (-1); |
| 452 | } |
| 453 | |
| 454 | /* Make sure channel is setup right one last time */ |
| 455 | SDL_memset(&csetup, 0x00, sizeof(csetup)); |
| 456 | csetup.channel = SND_PCM_CHANNEL_PLAYBACK; |
| 457 | if (snd_pcm_plugin_setup(audio_handle, &csetup) < 0) |
| 458 | { |
| 459 | SDL_SetError("NTO_OpenAudio(): Unable to setup playback channel\n"); |
| 460 | return -1; |
| 461 | } |
| 462 | |
| 463 | |
| 464 | /* Calculate the final parameters for this audio specification */ |
| 465 | SDL_CalculateAudioSpec(spec); |
| 466 | |
| 467 | pcm_len = spec->size; |
| 468 | |
| 469 | if (pcm_len==0) |
| 470 | { |
| 471 | pcm_len = csetup.buf.block.frag_size * spec->channels * (snd_pcm_format_width(format)/8); |
| 472 | } |
| 473 | |
| 474 | /* Allocate memory to the audio buffer and initialize with silence (Note that |
| 475 | buffer size must be a multiple of fragment size, so find closest multiple) |
| 476 | */ |
| 477 | pcm_buf = (Uint8*)SDL_AllocAudioMem(pcm_len); |
| 478 | if (pcm_buf == NULL) |
| 479 | { |
| 480 | SDL_SetError("NTO_OpenAudio(): pcm buffer allocation failed\n"); |
| 481 | return (-1); |
| 482 | } |
| 483 | SDL_memset(pcm_buf, spec->silence, pcm_len); |
| 484 | |
| 485 | /* get the file descriptor */ |
| 486 | if ((audio_fd = snd_pcm_file_descriptor(audio_handle, SND_PCM_CHANNEL_PLAYBACK)) < 0) |
| 487 | { |
| 488 | SDL_SetError("NTO_OpenAudio(): snd_pcm_file_descriptor failed with error code: %s\n", snd_strerror(rval)); |
| 489 | return (-1); |
| 490 | } |
| 491 | |
| 492 | /* Trigger audio playback */ |
| 493 | rval = snd_pcm_plugin_prepare(audio_handle, SND_PCM_CHANNEL_PLAYBACK); |
| 494 | if (rval < 0) |
| 495 | { |
| 496 | SDL_SetError("snd_pcm_plugin_prepare failed: %s\n", snd_strerror(rval)); |
| 497 | return (-1); |
| 498 | } |
| 499 | |
| 500 | this->enabled = 1; |
| 501 | |
| 502 | /* Get the parent process id (we're the parent of the audio thread) */ |
| 503 | parent = getpid(); |
| 504 | |
| 505 | /* We're really ready to rock and roll. :-) */ |
| 506 | return (0); |
| 507 | } |