1/* 2 * PCM - Direct Stream Mixing 3 * Copyright (c) 2003 by Jaroslav Kysela <perex@perex.cz> 4 * 5 * 6 * This library is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU Lesser General Public License as 8 * published by the Free Software Foundation; either version 2.1 of 9 * the License, or (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU Lesser General Public License for more details. 15 * 16 * You should have received a copy of the GNU Lesser General Public 17 * License along with this library; if not, write to the Free Software 18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 * 20 */ 21 22#include <stdio.h> 23#include <stdlib.h> 24#include <stddef.h> 25#include <unistd.h> 26#include <signal.h> 27#include <string.h> 28#include <fcntl.h> 29#include <ctype.h> 30#include <grp.h> 31#include <sys/ioctl.h> 32#include <sys/mman.h> 33#include <sys/poll.h> 34#include <sys/shm.h> 35#include <sys/sem.h> 36#include <sys/wait.h> 37#include <sys/socket.h> 38#include <sys/stat.h> 39#include <sys/un.h> 40#include <sys/mman.h> 41#include "pcm_direct.h" 42 43/* 44 * 45 */ 46 47union semun { 48 int val; /* Value for SETVAL */ 49 struct semid_ds *buf; /* Buffer for IPC_STAT, IPC_SET */ 50 unsigned short *array; /* Array for GETALL, SETALL */ 51 struct seminfo *__buf; /* Buffer for IPC_INFO (Linux specific) */ 52}; 53 54/* 55 * FIXME: 56 * add possibility to use futexes here 57 */ 58 59int snd_pcm_direct_semaphore_create_or_connect(snd_pcm_direct_t *dmix) 60{ 61 union semun s; 62 struct semid_ds buf; 63 int i; 64 65 dmix->semid = semget(dmix->ipc_key, DIRECT_IPC_SEMS, 66 IPC_CREAT | dmix->ipc_perm); 67 if (dmix->semid < 0) 68 return -errno; 69 if (dmix->ipc_gid < 0) 70 return 0; 71 for (i = 0; i < DIRECT_IPC_SEMS; i++) { 72 s.buf = &buf; 73 if (semctl(dmix->semid, i, IPC_STAT, s) < 0) { 74 int err = -errno; 75 snd_pcm_direct_semaphore_discard(dmix); 76 return err; 77 } 78 buf.sem_perm.gid = dmix->ipc_gid; 79 s.buf = &buf; 80 semctl(dmix->semid, i, IPC_SET, s); 81 } 82 return 0; 83} 84 85#define SND_PCM_DIRECT_MAGIC (0xa15ad300 + sizeof(snd_pcm_direct_share_t)) 86 87/* 88 * global shared memory area 89 */ 90 91int snd_pcm_direct_shm_create_or_connect(snd_pcm_direct_t *dmix) 92{ 93 struct shmid_ds buf; 94 int tmpid, err; 95 96retryget: 97 dmix->shmid = shmget(dmix->ipc_key, sizeof(snd_pcm_direct_share_t), 98 IPC_CREAT | dmix->ipc_perm); 99 err = -errno; 100 if (dmix->shmid < 0){ 101 if (errno == EINVAL) 102 if ((tmpid = shmget(dmix->ipc_key, 0, dmix->ipc_perm)) != -1) 103 if (!shmctl(tmpid, IPC_STAT, &buf)) 104 if (!buf.shm_nattch) 105 /* no users so destroy the segment */ 106 if (!shmctl(tmpid, IPC_RMID, NULL)) 107 goto retryget; 108 return err; 109 } 110 dmix->shmptr = shmat(dmix->shmid, 0, 0); 111 if (dmix->shmptr == (void *) -1) { 112 err = -errno; 113 snd_pcm_direct_shm_discard(dmix); 114 return err; 115 } 116 mlock(dmix->shmptr, sizeof(snd_pcm_direct_share_t)); 117 if (shmctl(dmix->shmid, IPC_STAT, &buf) < 0) { 118 err = -errno; 119 snd_pcm_direct_shm_discard(dmix); 120 return err; 121 } 122 if (buf.shm_nattch == 1) { /* we're the first user, clear the segment */ 123 memset(dmix->shmptr, 0, sizeof(snd_pcm_direct_share_t)); 124 if (dmix->ipc_gid >= 0) { 125 buf.shm_perm.gid = dmix->ipc_gid; 126 shmctl(dmix->shmid, IPC_SET, &buf); 127 } 128 dmix->shmptr->magic = SND_PCM_DIRECT_MAGIC; 129 return 1; 130 } else { 131 if (dmix->shmptr->magic != SND_PCM_DIRECT_MAGIC) { 132 snd_pcm_direct_shm_discard(dmix); 133 return -EINVAL; 134 } 135 } 136 return 0; 137} 138 139/* discard shared memory */ 140/* 141 * Define snd_* functions to be used in server. 142 * Since objects referred in a plugin can be released dynamically, a forked 143 * server should have statically linked functions. 144 * (e.g. Novell bugzilla #105772) 145 */ 146static int _snd_pcm_direct_shm_discard(snd_pcm_direct_t *dmix) 147{ 148 struct shmid_ds buf; 149 int ret = 0; 150 151 if (dmix->shmid < 0) 152 return -EINVAL; 153 if (dmix->shmptr != (void *) -1 && shmdt(dmix->shmptr) < 0) 154 return -errno; 155 dmix->shmptr = (void *) -1; 156 if (shmctl(dmix->shmid, IPC_STAT, &buf) < 0) 157 return -errno; 158 if (buf.shm_nattch == 0) { /* we're the last user, destroy the segment */ 159 if (shmctl(dmix->shmid, IPC_RMID, NULL) < 0) 160 return -errno; 161 ret = 1; 162 } 163 dmix->shmid = -1; 164 return ret; 165} 166 167/* ... and an exported version */ 168int snd_pcm_direct_shm_discard(snd_pcm_direct_t *dmix) 169{ 170 return _snd_pcm_direct_shm_discard(dmix); 171} 172 173/* 174 * server side 175 */ 176 177static int get_tmp_name(char *filename, size_t size) 178{ 179 struct timeval tv; 180 181 gettimeofday(&tv, NULL); 182 snprintf(filename, size, TMPDIR "/alsa-dmix-%i-%li-%li", (int)getpid(), (long)tv.tv_sec, (long)tv.tv_usec); 183 filename[size-1] = '\0'; 184 return 0; 185} 186 187static int make_local_socket(const char *filename, int server, mode_t ipc_perm, int ipc_gid) 188{ 189 size_t l = strlen(filename); 190 size_t size = offsetof(struct sockaddr_un, sun_path) + l; 191 struct sockaddr_un *addr = alloca(size); 192 int sock; 193 194 sock = socket(PF_LOCAL, SOCK_STREAM, 0); 195 if (sock < 0) { 196 int result = -errno; 197 SYSERR("socket failed"); 198 return result; 199 } 200 201 if (server) 202 unlink(filename); 203 memset(addr, 0, size); /* make valgrind happy */ 204 addr->sun_family = AF_LOCAL; 205 memcpy(addr->sun_path, filename, l); 206 207 if (server) { 208 if (bind(sock, (struct sockaddr *) addr, size) < 0) { 209 int result = -errno; 210 SYSERR("bind failed: %s", filename); 211 close(sock); 212 return result; 213 } else { 214 if (chmod(filename, ipc_perm) < 0) { 215 int result = -errno; 216 SYSERR("chmod failed: %s", filename); 217 close(sock); 218 unlink(filename); 219 return result; 220 } 221 if (chown(filename, -1, ipc_gid) < 0) { 222#if 0 /* it's not fatal */ 223 int result = -errno; 224 SYSERR("chown failed: %s", filename); 225 close(sock); 226 unlink(filename); 227 return result; 228#endif 229 } 230 } 231 } else { 232 if (connect(sock, (struct sockaddr *) addr, size) < 0) { 233 int result = -errno; 234 SYSERR("connect failed: %s", filename); 235 close(sock); 236 return result; 237 } 238 } 239 return sock; 240} 241 242#if 0 243#define SERVER_JOB_DEBUG 244#define server_printf(fmt, args...) printf(fmt, ##args) 245#else 246#undef SERVER_JOB_DEBUG 247#define server_printf(fmt, args...) /* nothing */ 248#endif 249 250static snd_pcm_direct_t *server_job_dmix; 251 252static void server_cleanup(snd_pcm_direct_t *dmix) 253{ 254 close(dmix->server_fd); 255 close(dmix->hw_fd); 256 if (dmix->server_free) 257 dmix->server_free(dmix); 258 unlink(dmix->shmptr->socket_name); 259 _snd_pcm_direct_shm_discard(dmix); 260 snd_pcm_direct_semaphore_discard(dmix); 261} 262 263static void server_job_signal(int sig ATTRIBUTE_UNUSED) 264{ 265 snd_pcm_direct_semaphore_down(server_job_dmix, DIRECT_IPC_SEM_CLIENT); 266 server_cleanup(server_job_dmix); 267 server_printf("DIRECT SERVER EXIT - SIGNAL\n"); 268 _exit(EXIT_SUCCESS); 269} 270 271/* This is a copy from ../socket.c, provided here only for a server job 272 * (see the comment above) 273 */ 274static int _snd_send_fd(int sock, void *data, size_t len, int fd) 275{ 276 int ret; 277 size_t cmsg_len = CMSG_LEN(sizeof(int)); 278 struct cmsghdr *cmsg = alloca(cmsg_len); 279 int *fds = (int *) CMSG_DATA(cmsg); 280 struct msghdr msghdr; 281 struct iovec vec; 282 283 vec.iov_base = (void *)&data; 284 vec.iov_len = len; 285 286 cmsg->cmsg_len = cmsg_len; 287 cmsg->cmsg_level = SOL_SOCKET; 288 cmsg->cmsg_type = SCM_RIGHTS; 289 *fds = fd; 290 291 msghdr.msg_name = NULL; 292 msghdr.msg_namelen = 0; 293 msghdr.msg_iov = &vec; 294 msghdr.msg_iovlen = 1; 295 msghdr.msg_control = cmsg; 296 msghdr.msg_controllen = cmsg_len; 297 msghdr.msg_flags = 0; 298 299 ret = sendmsg(sock, &msghdr, 0 ); 300 if (ret < 0) 301 return -errno; 302 return ret; 303} 304 305static void server_job(snd_pcm_direct_t *dmix) 306{ 307 int ret, sck, i; 308 int max = 128, current = 0; 309 struct pollfd pfds[max + 1]; 310 311 server_job_dmix = dmix; 312 /* don't allow to be killed */ 313 signal(SIGHUP, server_job_signal); 314 signal(SIGQUIT, server_job_signal); 315 signal(SIGTERM, server_job_signal); 316 signal(SIGKILL, server_job_signal); 317 /* close all files to free resources */ 318 i = sysconf(_SC_OPEN_MAX); 319#ifdef SERVER_JOB_DEBUG 320 while (--i >= 3) { 321#else 322 while (--i >= 0) { 323#endif 324 if (i != dmix->server_fd && i != dmix->hw_fd) 325 close(i); 326 } 327 328 /* detach from parent */ 329 setsid(); 330 331 pfds[0].fd = dmix->server_fd; 332 pfds[0].events = POLLIN | POLLERR | POLLHUP; 333 334 server_printf("DIRECT SERVER STARTED\n"); 335 while (1) { 336 ret = poll(pfds, current + 1, 500); 337 server_printf("DIRECT SERVER: poll ret = %i, revents[0] = 0x%x, errno = %i\n", ret, pfds[0].revents, errno); 338 if (ret < 0) { 339 if (errno == EINTR) 340 continue; 341 /* some error */ 342 break; 343 } 344 if (ret == 0 || (pfds[0].revents & (POLLERR | POLLHUP))) { /* timeout or error? */ 345 struct shmid_ds buf; 346 snd_pcm_direct_semaphore_down(dmix, DIRECT_IPC_SEM_CLIENT); 347 if (shmctl(dmix->shmid, IPC_STAT, &buf) < 0) { 348 _snd_pcm_direct_shm_discard(dmix); 349 snd_pcm_direct_semaphore_up(dmix, DIRECT_IPC_SEM_CLIENT); 350 continue; 351 } 352 server_printf("DIRECT SERVER: nattch = %i\n", (int)buf.shm_nattch); 353 if (buf.shm_nattch == 1) /* server is the last user, exit */ 354 break; 355 snd_pcm_direct_semaphore_up(dmix, DIRECT_IPC_SEM_CLIENT); 356 continue; 357 } 358 if (pfds[0].revents & POLLIN) { 359 ret--; 360 sck = accept(dmix->server_fd, 0, 0); 361 if (sck >= 0) { 362 server_printf("DIRECT SERVER: new connection %i\n", sck); 363 if (current == max) { 364 close(sck); 365 } else { 366 unsigned char buf = 'A'; 367 pfds[current+1].fd = sck; 368 pfds[current+1].events = POLLIN | POLLERR | POLLHUP; 369 _snd_send_fd(sck, &buf, 1, dmix->hw_fd); 370 server_printf("DIRECT SERVER: fd sent ok\n"); 371 current++; 372 } 373 } 374 } 375 for (i = 0; i < current && ret > 0; i++) { 376 struct pollfd *pfd = &pfds[i+1]; 377 unsigned char cmd; 378 server_printf("client %i revents = 0x%x\n", pfd->fd, pfd->revents); 379 if (pfd->revents & (POLLERR | POLLHUP)) { 380 ret--; 381 close(pfd->fd); 382 pfd->fd = -1; 383 continue; 384 } 385 if (!(pfd->revents & POLLIN)) 386 continue; 387 ret--; 388 if (read(pfd->fd, &cmd, 1) == 1) 389 cmd = 0 /*process command */; 390 } 391 for (i = 0; i < current; i++) { 392 if (pfds[i+1].fd < 0) { 393 if (i + 1 != max) 394 memcpy(&pfds[i+1], &pfds[i+2], sizeof(struct pollfd) * (max - i - 1)); 395 current--; 396 } 397 } 398 } 399 server_cleanup(dmix); 400 server_printf("DIRECT SERVER EXIT\n"); 401#ifdef SERVER_JOB_DEBUG 402 close(0); close(1); close(2); 403#endif 404 _exit(EXIT_SUCCESS); 405} 406 407int snd_pcm_direct_server_create(snd_pcm_direct_t *dmix) 408{ 409 int ret; 410 411 dmix->server_fd = -1; 412 413 ret = get_tmp_name(dmix->shmptr->socket_name, sizeof(dmix->shmptr->socket_name)); 414 if (ret < 0) 415 return ret; 416 417 ret = make_local_socket(dmix->shmptr->socket_name, 1, dmix->ipc_perm, dmix->ipc_gid); 418 if (ret < 0) 419 return ret; 420 dmix->server_fd = ret; 421 422 ret = listen(dmix->server_fd, 4); 423 if (ret < 0) { 424 close(dmix->server_fd); 425 return ret; 426 } 427 428 ret = fork(); 429 if (ret < 0) { 430 close(dmix->server_fd); 431 return ret; 432 } else if (ret == 0) { 433 ret = fork(); 434 if (ret == 0) 435 server_job(dmix); 436 _exit(EXIT_SUCCESS); 437 } else { 438 waitpid(ret, NULL, 0); 439 } 440 dmix->server_pid = ret; 441 dmix->server = 1; 442 return 0; 443} 444 445int snd_pcm_direct_server_discard(snd_pcm_direct_t *dmix) 446{ 447 if (dmix->server) { 448 //kill(dmix->server_pid, SIGTERM); 449 //waitpid(dmix->server_pid, NULL, 0); 450 dmix->server_pid = (pid_t)-1; 451 } 452 if (dmix->server_fd > 0) { 453 close(dmix->server_fd); 454 dmix->server_fd = -1; 455 } 456 dmix->server = 0; 457 return 0; 458} 459 460/* 461 * client side 462 */ 463 464int snd_pcm_direct_client_connect(snd_pcm_direct_t *dmix) 465{ 466 int ret; 467 unsigned char buf; 468 469 ret = make_local_socket(dmix->shmptr->socket_name, 0, -1, -1); 470 if (ret < 0) 471 return ret; 472 dmix->comm_fd = ret; 473 474 ret = snd_receive_fd(dmix->comm_fd, &buf, 1, &dmix->hw_fd); 475 if (ret < 1 || buf != 'A') { 476 close(dmix->comm_fd); 477 dmix->comm_fd = -1; 478 return ret; 479 } 480 481 dmix->client = 1; 482 return 0; 483} 484 485int snd_pcm_direct_client_discard(snd_pcm_direct_t *dmix) 486{ 487 if (dmix->client) { 488 close(dmix->comm_fd); 489 dmix->comm_fd = -1; 490 } 491 return 0; 492} 493 494/* 495 * plugin helpers 496 */ 497 498int snd_pcm_direct_nonblock(snd_pcm_t *pcm ATTRIBUTE_UNUSED, int nonblock ATTRIBUTE_UNUSED) 499{ 500 /* value is cached for us in pcm->mode (SND_PCM_NONBLOCK flag) */ 501 return 0; 502} 503 504int snd_pcm_direct_async(snd_pcm_t *pcm, int sig, pid_t pid) 505{ 506 snd_pcm_direct_t *dmix = pcm->private_data; 507 return snd_timer_async(dmix->timer, sig, pid); 508} 509 510/* empty the timer read queue */ 511void snd_pcm_direct_clear_timer_queue(snd_pcm_direct_t *dmix) 512{ 513 if (dmix->timer_need_poll) { 514 while (poll(&dmix->timer_fd, 1, 0) > 0) { 515 /* we don't need the value */ 516 if (dmix->tread) { 517 snd_timer_tread_t rbuf[4]; 518 snd_timer_read(dmix->timer, rbuf, sizeof(rbuf)); 519 } else { 520 snd_timer_read_t rbuf; 521 snd_timer_read(dmix->timer, &rbuf, sizeof(rbuf)); 522 } 523 } 524 } else { 525 if (dmix->tread) { 526 snd_timer_tread_t rbuf[4]; 527 int len; 528 while ((len = snd_timer_read(dmix->timer, rbuf, 529 sizeof(rbuf))) > 0 && 530 len != sizeof(rbuf[0])) 531 ; 532 } else { 533 snd_timer_read_t rbuf; 534 while (snd_timer_read(dmix->timer, &rbuf, sizeof(rbuf)) > 0) 535 ; 536 } 537 } 538} 539 540int snd_pcm_direct_timer_stop(snd_pcm_direct_t *dmix) 541{ 542 snd_timer_stop(dmix->timer); 543 return 0; 544} 545 546int snd_pcm_direct_poll_revents(snd_pcm_t *pcm, struct pollfd *pfds, unsigned int nfds, unsigned short *revents) 547{ 548 snd_pcm_direct_t *dmix = pcm->private_data; 549 unsigned short events; 550 int empty = 0; 551 552 assert(pfds && nfds == 1 && revents); 553 events = pfds[0].revents; 554 if (events & POLLIN) { 555 snd_pcm_uframes_t avail; 556 snd_pcm_avail_update(pcm); 557 if (pcm->stream == SND_PCM_STREAM_PLAYBACK) { 558 events |= POLLOUT; 559 events &= ~POLLIN; 560 avail = snd_pcm_mmap_playback_avail(pcm); 561 } else { 562 avail = snd_pcm_mmap_capture_avail(pcm); 563 } 564 empty = avail < pcm->avail_min; 565 } 566 switch (snd_pcm_state(dmix->spcm)) { 567 case SND_PCM_STATE_XRUN: 568 case SND_PCM_STATE_SUSPENDED: 569 case SND_PCM_STATE_SETUP: 570 events |= POLLERR; 571 break; 572 default: 573 if (empty) { 574 snd_pcm_direct_clear_timer_queue(dmix); 575 events &= ~(POLLOUT|POLLIN); 576 /* additional check */ 577 switch (snd_pcm_state(pcm)) { 578 case SND_PCM_STATE_XRUN: 579 case SND_PCM_STATE_SUSPENDED: 580 case SND_PCM_STATE_SETUP: 581 events |= POLLERR; 582 break; 583 default: 584 break; 585 } 586 } 587 break; 588 } 589 *revents = events; 590 return 0; 591} 592 593int snd_pcm_direct_info(snd_pcm_t *pcm, snd_pcm_info_t * info) 594{ 595 snd_pcm_direct_t *dmix = pcm->private_data; 596 597 if (dmix->spcm && !dmix->shmptr->use_server) 598 return snd_pcm_info(dmix->spcm, info); 599 600 memset(info, 0, sizeof(*info)); 601 info->stream = pcm->stream; 602 info->card = -1; 603 /* FIXME: fill this with something more useful: we know the hardware name */ 604 if (pcm->name) { 605 strncpy((char *)info->id, pcm->name, sizeof(info->id)); 606 strncpy((char *)info->name, pcm->name, sizeof(info->name)); 607 strncpy((char *)info->subname, pcm->name, sizeof(info->subname)); 608 } 609 info->subdevices_count = 1; 610 return 0; 611} 612 613static inline snd_mask_t *hw_param_mask(snd_pcm_hw_params_t *params, 614 snd_pcm_hw_param_t var) 615{ 616 return ¶ms->masks[var - SND_PCM_HW_PARAM_FIRST_MASK]; 617} 618 619static inline snd_interval_t *hw_param_interval(snd_pcm_hw_params_t *params, 620 snd_pcm_hw_param_t var) 621{ 622 return ¶ms->intervals[var - SND_PCM_HW_PARAM_FIRST_INTERVAL]; 623} 624 625static int hw_param_interval_refine_one(snd_pcm_hw_params_t *params, 626 snd_pcm_hw_param_t var, 627 snd_interval_t *src) 628{ 629 snd_interval_t *i; 630 631 if (!(params->rmask & (1<<var))) /* nothing to do? */ 632 return 0; 633 i = hw_param_interval(params, var); 634 if (snd_interval_empty(i)) { 635 SNDERR("dshare interval %i empty?", (int)var); 636 return -EINVAL; 637 } 638 if (snd_interval_refine(i, src)) 639 params->cmask |= 1<<var; 640 return 0; 641} 642 643static int hw_param_interval_refine_minmax(snd_pcm_hw_params_t *params, 644 snd_pcm_hw_param_t var, 645 unsigned int imin, 646 unsigned int imax) 647{ 648 snd_interval_t t; 649 650 memset(&t, 0, sizeof(t)); 651 snd_interval_set_minmax(&t, imin, imax); 652 t.integer = 1; 653 return hw_param_interval_refine_one(params, var, &t); 654} 655 656#undef REFINE_DEBUG 657 658int snd_pcm_direct_hw_refine(snd_pcm_t *pcm, snd_pcm_hw_params_t *params) 659{ 660 snd_pcm_direct_t *dshare = pcm->private_data; 661 static const snd_mask_t access = { .bits = { 662 (1<<SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) | 663 (1<<SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED) | 664 (1<<SNDRV_PCM_ACCESS_RW_INTERLEAVED) | 665 (1<<SNDRV_PCM_ACCESS_RW_NONINTERLEAVED), 666 0, 0, 0 } }; 667 int err; 668 669#ifdef REFINE_DEBUG 670 snd_output_t *log; 671 snd_output_stdio_attach(&log, stderr, 0); 672 snd_output_puts(log, "DMIX REFINE (begin):\n"); 673 snd_pcm_hw_params_dump(params, log); 674#endif 675 if (params->rmask & (1<<SND_PCM_HW_PARAM_ACCESS)) { 676 if (snd_mask_empty(hw_param_mask(params, SND_PCM_HW_PARAM_ACCESS))) { 677 SNDERR("dshare access mask empty?"); 678 return -EINVAL; 679 } 680 if (snd_mask_refine(hw_param_mask(params, SND_PCM_HW_PARAM_ACCESS), &access)) 681 params->cmask |= 1<<SND_PCM_HW_PARAM_ACCESS; 682 } 683 if (params->rmask & (1<<SND_PCM_HW_PARAM_FORMAT)) { 684 if (snd_mask_empty(hw_param_mask(params, SND_PCM_HW_PARAM_FORMAT))) { 685 SNDERR("dshare format mask empty?"); 686 return -EINVAL; 687 } 688 if (snd_mask_refine_set(hw_param_mask(params, SND_PCM_HW_PARAM_FORMAT), 689 dshare->shmptr->hw.format)) 690 params->cmask |= 1<<SND_PCM_HW_PARAM_FORMAT; 691 } 692 //snd_mask_none(hw_param_mask(params, SND_PCM_HW_PARAM_SUBFORMAT)); 693 if (params->rmask & (1<<SND_PCM_HW_PARAM_CHANNELS)) { 694 if (snd_interval_empty(hw_param_interval(params, SND_PCM_HW_PARAM_CHANNELS))) { 695 SNDERR("dshare channels mask empty?"); 696 return -EINVAL; 697 } 698 err = snd_interval_refine_set(hw_param_interval(params, SND_PCM_HW_PARAM_CHANNELS), dshare->channels); 699 if (err < 0) 700 return err; 701 } 702 err = hw_param_interval_refine_one(params, SND_PCM_HW_PARAM_RATE, 703 &dshare->shmptr->hw.rate); 704 if (err < 0) 705 return err; 706 err = hw_param_interval_refine_one(params, SND_PCM_HW_PARAM_PERIOD_SIZE, 707 &dshare->shmptr->hw.period_size); 708 if (err < 0) 709 return err; 710 err = hw_param_interval_refine_one(params, SND_PCM_HW_PARAM_PERIOD_TIME, 711 &dshare->shmptr->hw.period_time); 712 if (err < 0) 713 return err; 714 if (dshare->max_periods < 0) { 715 err = hw_param_interval_refine_one(params, SND_PCM_HW_PARAM_BUFFER_SIZE, 716 &dshare->shmptr->hw.buffer_size); 717 if (err < 0) 718 return err; 719 err = hw_param_interval_refine_one(params, SND_PCM_HW_PARAM_BUFFER_TIME, 720 &dshare->shmptr->hw.buffer_time); 721 if (err < 0) 722 return err; 723 } else if (params->rmask & ((1<<SND_PCM_HW_PARAM_PERIODS)| 724 (1<<SND_PCM_HW_PARAM_BUFFER_BYTES)| 725 (1<<SND_PCM_HW_PARAM_BUFFER_SIZE)| 726 (1<<SND_PCM_HW_PARAM_BUFFER_TIME))) { 727 int changed; 728 unsigned int max_periods = dshare->max_periods; 729 if (max_periods < 2) 730 max_periods = dshare->slave_buffer_size / dshare->slave_period_size; 731 do { 732 changed = 0; 733 err = hw_param_interval_refine_minmax(params, SND_PCM_HW_PARAM_PERIODS, 734 2, max_periods); 735 if (err < 0) 736 return err; 737 changed |= err; 738 err = snd_pcm_hw_refine_soft(pcm, params); 739 if (err < 0) 740 return err; 741 changed |= err; 742 } while (changed); 743 } 744 params->info = dshare->shmptr->s.info; 745#ifdef REFINE_DEBUG 746 snd_output_puts(log, "DMIX REFINE (end):\n"); 747 snd_pcm_hw_params_dump(params, log); 748 snd_output_close(log); 749#endif 750 return 0; 751} 752 753int snd_pcm_direct_hw_params(snd_pcm_t *pcm, snd_pcm_hw_params_t * params) 754{ 755 snd_pcm_direct_t *dmix = pcm->private_data; 756 757 params->info = dmix->shmptr->s.info; 758 params->rate_num = dmix->shmptr->s.rate; 759 params->rate_den = 1; 760 params->fifo_size = 0; 761 params->msbits = dmix->shmptr->s.msbits; 762 return 0; 763} 764 765int snd_pcm_direct_hw_free(snd_pcm_t *pcm ATTRIBUTE_UNUSED) 766{ 767 /* values are cached in the pcm structure */ 768 return 0; 769} 770 771int snd_pcm_direct_sw_params(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_sw_params_t * params ATTRIBUTE_UNUSED) 772{ 773 /* values are cached in the pcm structure */ 774 return 0; 775} 776 777int snd_pcm_direct_channel_info(snd_pcm_t *pcm, snd_pcm_channel_info_t * info) 778{ 779 return snd_pcm_channel_info_shm(pcm, info, -1); 780} 781 782int snd_pcm_direct_mmap(snd_pcm_t *pcm ATTRIBUTE_UNUSED) 783{ 784 return 0; 785} 786 787int snd_pcm_direct_munmap(snd_pcm_t *pcm ATTRIBUTE_UNUSED) 788{ 789 return 0; 790} 791 792int snd_pcm_direct_resume(snd_pcm_t *pcm) 793{ 794 snd_pcm_direct_t *dmix = pcm->private_data; 795 int err; 796 797 snd_pcm_direct_semaphore_down(dmix, DIRECT_IPC_SEM_CLIENT); 798 err = snd_pcm_resume(dmix->spcm); 799 if (err == -ENOSYS) { 800 /* FIXME: error handling? */ 801 snd_pcm_prepare(dmix->spcm); 802 snd_pcm_start(dmix->spcm); 803 err = 0; 804 } 805 snd_pcm_direct_semaphore_up(dmix, DIRECT_IPC_SEM_CLIENT); 806 return err; 807} 808 809#define COPY_SLAVE(field) (dmix->shmptr->s.field = spcm->field) 810 811/* copy the slave setting */ 812static void save_slave_setting(snd_pcm_direct_t *dmix, snd_pcm_t *spcm) 813{ 814 spcm->info &= ~SND_PCM_INFO_PAUSE; 815 816 COPY_SLAVE(access); 817 COPY_SLAVE(format); 818 COPY_SLAVE(subformat); 819 COPY_SLAVE(channels); 820 COPY_SLAVE(rate); 821 COPY_SLAVE(period_size); 822 COPY_SLAVE(period_time); 823 COPY_SLAVE(periods); 824 COPY_SLAVE(tstamp_mode); 825 COPY_SLAVE(period_step); 826 COPY_SLAVE(avail_min); 827 COPY_SLAVE(start_threshold); 828 COPY_SLAVE(stop_threshold); 829 COPY_SLAVE(silence_threshold); 830 COPY_SLAVE(silence_size); 831 COPY_SLAVE(boundary); 832 COPY_SLAVE(info); 833 COPY_SLAVE(msbits); 834 COPY_SLAVE(rate_num); 835 COPY_SLAVE(rate_den); 836 COPY_SLAVE(hw_flags); 837 COPY_SLAVE(fifo_size); 838 COPY_SLAVE(buffer_size); 839 COPY_SLAVE(buffer_time); 840 COPY_SLAVE(sample_bits); 841 COPY_SLAVE(frame_bits); 842} 843 844#undef COPY_SLAVE 845 846/* 847 * this function initializes hardware and starts playback operation with 848 * no stop threshold (it operates all time without xrun checking) 849 * also, the driver silences the unused ring buffer areas for us 850 */ 851int snd_pcm_direct_initialize_slave(snd_pcm_direct_t *dmix, snd_pcm_t *spcm, struct slave_params *params) 852{ 853 snd_pcm_hw_params_t *hw_params; 854 snd_pcm_sw_params_t *sw_params; 855 int ret, buffer_is_not_initialized; 856 snd_pcm_uframes_t boundary; 857 struct pollfd fd; 858 int loops = 10; 859 860 snd_pcm_hw_params_alloca(&hw_params); 861 snd_pcm_sw_params_alloca(&sw_params); 862 863 __again: 864 if (loops-- <= 0) { 865 SNDERR("unable to find a valid configuration for slave"); 866 return -EINVAL; 867 } 868 ret = snd_pcm_hw_params_any(spcm, hw_params); 869 if (ret < 0) { 870 SNDERR("snd_pcm_hw_params_any failed"); 871 return ret; 872 } 873 ret = snd_pcm_hw_params_set_access(spcm, hw_params, SND_PCM_ACCESS_MMAP_INTERLEAVED); 874 if (ret < 0) { 875 ret = snd_pcm_hw_params_set_access(spcm, hw_params, SND_PCM_ACCESS_MMAP_NONINTERLEAVED); 876 if (ret < 0) { 877 SNDERR("slave plugin does not support mmap interleaved or mmap noninterleaved access"); 878 return ret; 879 } 880 } 881 if (params->format == SND_PCM_FORMAT_UNKNOWN) 882 ret = -EINVAL; 883 else 884 ret = snd_pcm_hw_params_set_format(spcm, hw_params, 885 params->format); 886 if (ret < 0) { 887 static const snd_pcm_format_t dmix_formats[] = { 888 SND_PCM_FORMAT_S32, 889 SND_PCM_FORMAT_S32 ^ SND_PCM_FORMAT_S32_LE ^ SND_PCM_FORMAT_S32_BE, 890 SND_PCM_FORMAT_S16, 891 SND_PCM_FORMAT_S16 ^ SND_PCM_FORMAT_S16_LE ^ SND_PCM_FORMAT_S16_BE, 892 SND_PCM_FORMAT_S24_LE, 893 SND_PCM_FORMAT_S24_3LE, 894 SND_PCM_FORMAT_U8, 895 }; 896 snd_pcm_format_t format; 897 unsigned int i; 898 899 for (i = 0; i < sizeof dmix_formats / sizeof dmix_formats[0]; ++i) { 900 format = dmix_formats[i]; 901 ret = snd_pcm_hw_params_set_format(spcm, hw_params, format); 902 if (ret >= 0) 903 break; 904 } 905 if (ret < 0 && dmix->type != SND_PCM_TYPE_DMIX) { 906 /* TODO: try to choose a good format */ 907 ret = INTERNAL(snd_pcm_hw_params_set_format_first)(spcm, hw_params, &format); 908 } 909 if (ret < 0) { 910 SNDERR("requested or auto-format is not available"); 911 return ret; 912 } 913 params->format = format; 914 } 915 ret = INTERNAL(snd_pcm_hw_params_set_channels_near)(spcm, hw_params, (unsigned int *)¶ms->channels); 916 if (ret < 0) { 917 SNDERR("requested count of channels is not available"); 918 return ret; 919 } 920 ret = INTERNAL(snd_pcm_hw_params_set_rate_near)(spcm, hw_params, (unsigned int *)¶ms->rate, 0); 921 if (ret < 0) { 922 SNDERR("requested rate is not available"); 923 return ret; 924 } 925 926 buffer_is_not_initialized = 0; 927 if (params->buffer_time > 0) { 928 ret = INTERNAL(snd_pcm_hw_params_set_buffer_time_near)(spcm, hw_params, (unsigned int *)¶ms->buffer_time, 0); 929 if (ret < 0) { 930 SNDERR("unable to set buffer time"); 931 return ret; 932 } 933 } else if (params->buffer_size > 0) { 934 ret = INTERNAL(snd_pcm_hw_params_set_buffer_size_near)(spcm, hw_params, (snd_pcm_uframes_t *)¶ms->buffer_size); 935 if (ret < 0) { 936 SNDERR("unable to set buffer size"); 937 return ret; 938 } 939 } else { 940 buffer_is_not_initialized = 1; 941 } 942 943 if (params->period_time > 0) { 944 ret = INTERNAL(snd_pcm_hw_params_set_period_time_near)(spcm, hw_params, (unsigned int *)¶ms->period_time, 0); 945 if (ret < 0) { 946 SNDERR("unable to set period_time"); 947 return ret; 948 } 949 } else if (params->period_size > 0) { 950 ret = INTERNAL(snd_pcm_hw_params_set_period_size_near)(spcm, hw_params, (snd_pcm_uframes_t *)¶ms->period_size, 0); 951 if (ret < 0) { 952 SNDERR("unable to set period_size"); 953 return ret; 954 } 955 } 956 957 if (buffer_is_not_initialized && params->periods > 0) { 958 unsigned int periods = params->periods; 959 ret = INTERNAL(snd_pcm_hw_params_set_periods_near)(spcm, hw_params, ¶ms->periods, 0); 960 if (ret < 0) { 961 SNDERR("unable to set requested periods"); 962 return ret; 963 } 964 if (params->periods == 1) { 965 params->periods = periods; 966 if (params->period_time > 0) { 967 params->period_time /= 2; 968 goto __again; 969 } else if (params->period_size > 0) { 970 params->period_size /= 2; 971 goto __again; 972 } 973 SNDERR("unable to use stream with periods == 1"); 974 return ret; 975 } 976 } 977 978 ret = snd_pcm_hw_params(spcm, hw_params); 979 if (ret < 0) { 980 SNDERR("unable to install hw params"); 981 return ret; 982 } 983 984 /* store some hw_params values to shared info */ 985 dmix->shmptr->hw.format = snd_mask_value(hw_param_mask(hw_params, SND_PCM_HW_PARAM_FORMAT)); 986 dmix->shmptr->hw.rate = *hw_param_interval(hw_params, SND_PCM_HW_PARAM_RATE); 987 dmix->shmptr->hw.buffer_size = *hw_param_interval(hw_params, SND_PCM_HW_PARAM_BUFFER_SIZE); 988 dmix->shmptr->hw.buffer_time = *hw_param_interval(hw_params, SND_PCM_HW_PARAM_BUFFER_TIME); 989 dmix->shmptr->hw.period_size = *hw_param_interval(hw_params, SND_PCM_HW_PARAM_PERIOD_SIZE); 990 dmix->shmptr->hw.period_time = *hw_param_interval(hw_params, SND_PCM_HW_PARAM_PERIOD_TIME); 991 dmix->shmptr->hw.periods = *hw_param_interval(hw_params, SND_PCM_HW_PARAM_PERIODS); 992 993 994 ret = snd_pcm_sw_params_current(spcm, sw_params); 995 if (ret < 0) { 996 SNDERR("unable to get current sw_params"); 997 return ret; 998 } 999 1000 ret = snd_pcm_sw_params_get_boundary(sw_params, &boundary); 1001 if (ret < 0) { 1002 SNDERR("unable to get boundary"); 1003 return ret; 1004 } 1005 ret = snd_pcm_sw_params_set_stop_threshold(spcm, sw_params, boundary); 1006 if (ret < 0) { 1007 SNDERR("unable to set stop threshold"); 1008 return ret; 1009 } 1010 1011 /* set timestamp mode to MMAP 1012 * the slave timestamp is copied appropriately in dsnoop/dmix/dshare 1013 * based on the tstamp_mode of each client 1014 */ 1015 ret = snd_pcm_sw_params_set_tstamp_mode(spcm, sw_params, 1016 SND_PCM_TSTAMP_ENABLE); 1017 if (ret < 0) { 1018 SNDERR("unable to tstamp mode MMAP"); 1019 return ret; 1020 } 1021 1022 if (dmix->type != SND_PCM_TYPE_DMIX) 1023 goto __skip_silencing; 1024 1025 ret = snd_pcm_sw_params_set_silence_threshold(spcm, sw_params, 0); 1026 if (ret < 0) { 1027 SNDERR("unable to set silence threshold"); 1028 return ret; 1029 } 1030 ret = snd_pcm_sw_params_set_silence_size(spcm, sw_params, boundary); 1031 if (ret < 0) { 1032 SNDERR("unable to set silence threshold (please upgrade to 0.9.0rc8+ driver)"); 1033 return ret; 1034 } 1035 1036 __skip_silencing: 1037 1038 ret = snd_pcm_sw_params(spcm, sw_params); 1039 if (ret < 0) { 1040 SNDERR("unable to install sw params (please upgrade to 0.9.0rc8+ driver)"); 1041 return ret; 1042 } 1043 1044 if (dmix->type == SND_PCM_TYPE_DSHARE) { 1045 const snd_pcm_channel_area_t *dst_areas; 1046 dst_areas = snd_pcm_mmap_areas(spcm); 1047 snd_pcm_areas_silence(dst_areas, 0, spcm->channels, spcm->buffer_size, spcm->format); 1048 } 1049 1050 ret = snd_pcm_start(spcm); 1051 if (ret < 0) { 1052 SNDERR("unable to start PCM stream"); 1053 return ret; 1054 } 1055 1056 if (snd_pcm_poll_descriptors_count(spcm) != 1) { 1057 SNDERR("unable to use hardware pcm with fd more than one!!!"); 1058 return ret; 1059 } 1060 snd_pcm_poll_descriptors(spcm, &fd, 1); 1061 dmix->hw_fd = fd.fd; 1062 1063 save_slave_setting(dmix, spcm); 1064 1065 /* Currently, we assume that each dmix client has the same 1066 * hw_params setting. 1067 * If the arbitrary hw_parmas is supported in future, 1068 * boundary has to be taken from the slave config but 1069 * recalculated for the native boundary size (for 32bit 1070 * emulation on 64bit arch). 1071 */ 1072 dmix->slave_buffer_size = spcm->buffer_size; 1073 dmix->slave_period_size = spcm->period_size; 1074 dmix->slave_boundary = spcm->boundary; 1075 1076 spcm->donot_close = 1; 1077 1078 { 1079 int ver = 0; 1080 ioctl(spcm->poll_fd, SNDRV_PCM_IOCTL_PVERSION, &ver); 1081 if (ver < SNDRV_PROTOCOL_VERSION(2, 0, 8)) 1082 dmix->shmptr->use_server = 1; 1083 } 1084 1085 return 0; 1086} 1087 1088/* 1089 * the trick is used here; we cannot use effectively the hardware handle because 1090 * we cannot drive multiple accesses to appl_ptr; so we use slave timer of given 1091 * PCM hardware handle; it's not this easy and cheap? 1092 */ 1093int snd_pcm_direct_initialize_poll_fd(snd_pcm_direct_t *dmix) 1094{ 1095 int ret; 1096 snd_pcm_info_t *info; 1097 char name[128]; 1098 int capture = dmix->type == SND_PCM_TYPE_DSNOOP ? 1 : 0; 1099 1100 dmix->tread = 1; 1101 dmix->timer_need_poll = 0; 1102 snd_pcm_info_alloca(&info); 1103 ret = snd_pcm_info(dmix->spcm, info); 1104 if (ret < 0) { 1105 SNDERR("unable to info for slave pcm"); 1106 return ret; 1107 } 1108 sprintf(name, "hw:CLASS=%i,SCLASS=0,CARD=%i,DEV=%i,SUBDEV=%i", 1109 (int)SND_TIMER_CLASS_PCM, 1110 snd_pcm_info_get_card(info), 1111 snd_pcm_info_get_device(info), 1112 snd_pcm_info_get_subdevice(info) * 2 + capture); 1113 ret = snd_timer_open(&dmix->timer, name, SND_TIMER_OPEN_NONBLOCK | SND_TIMER_OPEN_TREAD); 1114 if (ret < 0) { 1115 dmix->tread = 0; 1116 ret = snd_timer_open(&dmix->timer, name, SND_TIMER_OPEN_NONBLOCK); 1117 if (ret < 0) { 1118 SNDERR("unable to open timer '%s'", name); 1119 return ret; 1120 } 1121 } 1122 1123 if (snd_timer_poll_descriptors_count(dmix->timer) != 1) { 1124 SNDERR("unable to use timer '%s' with more than one fd!", name); 1125 return ret; 1126 } 1127 snd_timer_poll_descriptors(dmix->timer, &dmix->timer_fd, 1); 1128 dmix->poll_fd = dmix->timer_fd.fd; 1129 1130 dmix->timer_events = (1<<SND_TIMER_EVENT_MSUSPEND) | 1131 (1<<SND_TIMER_EVENT_MRESUME) | 1132 (1<<SND_TIMER_EVENT_STOP); 1133 1134 /* 1135 * Some hacks for older kernel drivers 1136 */ 1137 { 1138 int ver = 0; 1139 ioctl(dmix->poll_fd, SNDRV_TIMER_IOCTL_PVERSION, &ver); 1140 /* In older versions, check via poll before read() is needed 1141 * because of the confliction between TIMER_START and 1142 * FIONBIO ioctls. 1143 */ 1144 if (ver < SNDRV_PROTOCOL_VERSION(2, 0, 4)) 1145 dmix->timer_need_poll = 1; 1146 /* 1147 * In older versions, timer uses pause events instead 1148 * suspend/resume events. 1149 */ 1150 if (ver < SNDRV_PROTOCOL_VERSION(2, 0, 5)) { 1151 dmix->timer_events &= ~((1<<SND_TIMER_EVENT_MSUSPEND) | 1152 (1<<SND_TIMER_EVENT_MRESUME)); 1153 dmix->timer_events |= (1<<SND_TIMER_EVENT_MPAUSE) | 1154 (1<<SND_TIMER_EVENT_MCONTINUE); 1155 } 1156 /* In older versions, use SND_TIMER_EVENT_START too. 1157 */ 1158 if (ver < SNDRV_PROTOCOL_VERSION(2, 0, 6)) 1159 dmix->timer_events |= 1<<SND_TIMER_EVENT_START; 1160 } 1161 return 0; 1162} 1163 1164static snd_pcm_uframes_t recalc_boundary_size(unsigned long long bsize, snd_pcm_uframes_t buffer_size) 1165{ 1166 if (bsize > LONG_MAX) { 1167 bsize = buffer_size; 1168 while (bsize * 2 <= LONG_MAX - buffer_size) 1169 bsize *= 2; 1170 } 1171 return (snd_pcm_uframes_t)bsize; 1172} 1173 1174#define COPY_SLAVE(field) (spcm->field = dmix->shmptr->s.field) 1175 1176/* copy the slave setting */ 1177static void copy_slave_setting(snd_pcm_direct_t *dmix, snd_pcm_t *spcm) 1178{ 1179 COPY_SLAVE(access); 1180 COPY_SLAVE(format); 1181 COPY_SLAVE(subformat); 1182 COPY_SLAVE(channels); 1183 COPY_SLAVE(rate); 1184 COPY_SLAVE(period_size); 1185 COPY_SLAVE(period_time); 1186 COPY_SLAVE(periods); 1187 COPY_SLAVE(tstamp_mode); 1188 COPY_SLAVE(period_step); 1189 COPY_SLAVE(avail_min); 1190 COPY_SLAVE(start_threshold); 1191 COPY_SLAVE(stop_threshold); 1192 COPY_SLAVE(silence_threshold); 1193 COPY_SLAVE(silence_size); 1194 COPY_SLAVE(boundary); 1195 COPY_SLAVE(info); 1196 COPY_SLAVE(msbits); 1197 COPY_SLAVE(rate_num); 1198 COPY_SLAVE(rate_den); 1199 COPY_SLAVE(hw_flags); 1200 COPY_SLAVE(fifo_size); 1201 COPY_SLAVE(buffer_size); 1202 COPY_SLAVE(buffer_time); 1203 COPY_SLAVE(sample_bits); 1204 COPY_SLAVE(frame_bits); 1205 1206 spcm->info &= ~SND_PCM_INFO_PAUSE; 1207 spcm->boundary = recalc_boundary_size(dmix->shmptr->s.boundary, spcm->buffer_size); 1208} 1209 1210#undef COPY_SLAVE 1211 1212 1213/* 1214 * open a slave PCM as secondary client (dup'ed fd) 1215 */ 1216int snd_pcm_direct_open_secondary_client(snd_pcm_t **spcmp, snd_pcm_direct_t *dmix, const char *client_name) 1217{ 1218 int ret; 1219 snd_pcm_t *spcm; 1220 1221 ret = snd_pcm_hw_open_fd(spcmp, client_name, dmix->hw_fd, 0, 0); 1222 if (ret < 0) { 1223 SNDERR("unable to open hardware"); 1224 return ret; 1225 } 1226 1227 spcm = *spcmp; 1228 spcm->donot_close = 1; 1229 spcm->setup = 1; 1230 1231 copy_slave_setting(dmix, spcm); 1232 1233 /* Use the slave setting as SPCM, so far */ 1234 dmix->slave_buffer_size = spcm->buffer_size; 1235 dmix->slave_period_size = dmix->shmptr->s.period_size; 1236 dmix->slave_boundary = spcm->boundary; 1237 1238 ret = snd_pcm_mmap(spcm); 1239 if (ret < 0) { 1240 SNDERR("unable to mmap channels"); 1241 return ret; 1242 } 1243 return 0; 1244} 1245 1246/* 1247 * open a slave PCM as secondary client (dup'ed fd) 1248 */ 1249int snd_pcm_direct_initialize_secondary_slave(snd_pcm_direct_t *dmix, 1250 snd_pcm_t *spcm, 1251 struct slave_params *params ATTRIBUTE_UNUSED) 1252{ 1253 int ret; 1254 1255 spcm->donot_close = 1; 1256 spcm->setup = 1; 1257 1258 copy_slave_setting(dmix, spcm); 1259 1260 /* Use the slave setting as SPCM, so far */ 1261 dmix->slave_buffer_size = spcm->buffer_size; 1262 dmix->slave_period_size = dmix->shmptr->s.period_size; 1263 dmix->slave_boundary = spcm->boundary; 1264 1265 ret = snd_pcm_mmap(spcm); 1266 if (ret < 0) { 1267 SNDERR("unable to mmap channels"); 1268 return ret; 1269 } 1270 return 0; 1271} 1272 1273int snd_pcm_direct_set_timer_params(snd_pcm_direct_t *dmix) 1274{ 1275 snd_timer_params_t *params; 1276 unsigned int filter; 1277 int ret; 1278 1279 snd_timer_params_alloca(¶ms); 1280 snd_timer_params_set_auto_start(params, 1); 1281 if (dmix->type != SND_PCM_TYPE_DSNOOP) 1282 snd_timer_params_set_early_event(params, 1); 1283 snd_timer_params_set_ticks(params, 1); 1284 if (dmix->tread) { 1285 filter = (1<<SND_TIMER_EVENT_TICK) | 1286 dmix->timer_events; 1287 snd_timer_params_set_filter(params, filter); 1288 } 1289 ret = snd_timer_params(dmix->timer, params); 1290 if (ret < 0) { 1291 SNDERR("unable to set timer parameters"); 1292 return ret; 1293 } 1294 return 0; 1295} 1296 1297/* 1298 * ring buffer operation 1299 */ 1300int snd_pcm_direct_check_interleave(snd_pcm_direct_t *dmix, snd_pcm_t *pcm) 1301{ 1302 unsigned int chn, channels; 1303 int bits, interleaved = 1; 1304 const snd_pcm_channel_area_t *dst_areas; 1305 const snd_pcm_channel_area_t *src_areas; 1306 1307 bits = snd_pcm_format_physical_width(pcm->format); 1308 if ((bits % 8) != 0) 1309 interleaved = 0; 1310 channels = dmix->channels; 1311 dst_areas = snd_pcm_mmap_areas(dmix->spcm); 1312 src_areas = snd_pcm_mmap_areas(pcm); 1313 for (chn = 1; chn < channels; chn++) { 1314 if (dst_areas[chn-1].addr != dst_areas[chn].addr) { 1315 interleaved = 0; 1316 break; 1317 } 1318 if (src_areas[chn-1].addr != src_areas[chn].addr) { 1319 interleaved = 0; 1320 break; 1321 } 1322 } 1323 for (chn = 0; chn < channels; chn++) { 1324 if (dmix->bindings && dmix->bindings[chn] != chn) { 1325 interleaved = 0; 1326 break; 1327 } 1328 if (dst_areas[chn].first != chn * bits || 1329 dst_areas[chn].step != channels * bits) { 1330 interleaved = 0; 1331 break; 1332 } 1333 if (src_areas[chn].first != chn * bits || 1334 src_areas[chn].step != channels * bits) { 1335 interleaved = 0; 1336 break; 1337 } 1338 } 1339 return dmix->interleaved = interleaved; 1340} 1341 1342/* 1343 * parse the channel map 1344 * id == client channel 1345 * value == slave's channel 1346 */ 1347int snd_pcm_direct_parse_bindings(snd_pcm_direct_t *dmix, 1348 struct slave_params *params, 1349 snd_config_t *cfg) 1350{ 1351 snd_config_iterator_t i, next; 1352 unsigned int chn, chn1, count = 0; 1353 unsigned int *bindings; 1354 int err; 1355 1356 dmix->channels = UINT_MAX; 1357 if (cfg == NULL) 1358 return 0; 1359 if (snd_config_get_type(cfg) != SND_CONFIG_TYPE_COMPOUND) { 1360 SNDERR("invalid type for bindings"); 1361 return -EINVAL; 1362 } 1363 snd_config_for_each(i, next, cfg) { 1364 snd_config_t *n = snd_config_iterator_entry(i); 1365 const char *id; 1366 long cchannel; 1367 if (snd_config_get_id(n, &id) < 0) 1368 continue; 1369 err = safe_strtol(id, &cchannel); 1370 if (err < 0 || cchannel < 0) { 1371 SNDERR("invalid client channel in binding: %s\n", id); 1372 return -EINVAL; 1373 } 1374 if ((unsigned)cchannel >= count) 1375 count = cchannel + 1; 1376 } 1377 if (count == 0) 1378 return 0; 1379 if (count > 1024) { 1380 SNDERR("client channel out of range"); 1381 return -EINVAL; 1382 } 1383 bindings = malloc(count * sizeof(unsigned int)); 1384 if (bindings == NULL) 1385 return -ENOMEM; 1386 for (chn = 0; chn < count; chn++) 1387 bindings[chn] = UINT_MAX; /* don't route */ 1388 snd_config_for_each(i, next, cfg) { 1389 snd_config_t *n = snd_config_iterator_entry(i); 1390 const char *id; 1391 long cchannel, schannel; 1392 if (snd_config_get_id(n, &id) < 0) 1393 continue; 1394 safe_strtol(id, &cchannel); 1395 if (snd_config_get_integer(n, &schannel) < 0) { 1396 SNDERR("unable to get slave channel (should be integer type) in binding: %s\n", id); 1397 free(bindings); 1398 return -EINVAL; 1399 } 1400 if (schannel < 0 || schannel >= params->channels) { 1401 SNDERR("invalid slave channel number %ld in binding to %ld", 1402 schannel, cchannel); 1403 free(bindings); 1404 return -EINVAL; 1405 } 1406 bindings[cchannel] = schannel; 1407 } 1408 if (dmix->type == SND_PCM_TYPE_DSNOOP || 1409 ! dmix->bindings) 1410 goto __skip_same_dst; 1411 for (chn = 0; chn < count; chn++) { 1412 for (chn1 = 0; chn1 < count; chn1++) { 1413 if (chn == chn1) 1414 continue; 1415 if (bindings[chn] == dmix->bindings[chn1]) { 1416 SNDERR("unable to route channels %d,%d to same destination %d", chn, chn1, bindings[chn]); 1417 free(bindings); 1418 return -EINVAL; 1419 } 1420 } 1421 } 1422 __skip_same_dst: 1423 dmix->bindings = bindings; 1424 dmix->channels = count; 1425 return 0; 1426} 1427 1428/* 1429 * parse slave config and calculate the ipc_key offset 1430 */ 1431 1432static int _snd_pcm_direct_get_slave_ipc_offset(snd_config_t *root, 1433 snd_config_t *sconf, 1434 int direction, 1435 int hop) 1436{ 1437 snd_config_iterator_t i, next; 1438 snd_config_t *pcm_conf; 1439 int err; 1440 long card = 0, device = 0, subdevice = 0; 1441 const char *str; 1442 1443 if (snd_config_get_string(sconf, &str) >= 0) { 1444 if (hop > SND_CONF_MAX_HOPS) { 1445 SNDERR("Too many definition levels (looped?)"); 1446 return -EINVAL; 1447 } 1448 err = snd_config_search_definition(root, "pcm", str, &pcm_conf); 1449 if (err < 0) { 1450 SNDERR("Unknown slave PCM %s", str); 1451 return err; 1452 } 1453 err = _snd_pcm_direct_get_slave_ipc_offset(root, pcm_conf, 1454 direction, 1455 hop + 1); 1456 snd_config_delete(pcm_conf); 1457 return err; 1458 } 1459 1460#if 0 /* for debug purposes */ 1461 { 1462 snd_output_t *out; 1463 snd_output_stdio_attach(&out, stderr, 0); 1464 snd_config_save(sconf, out); 1465 snd_output_close(out); 1466 } 1467#endif 1468 1469 if (snd_config_search(sconf, "slave", &pcm_conf) >= 0 && 1470 (snd_config_search(pcm_conf, "pcm", &pcm_conf) >= 0 || 1471 (snd_config_get_string(pcm_conf, &str) >= 0 && 1472 snd_config_search_definition(root, "pcm_slave", str, &pcm_conf) >= 0 && 1473 snd_config_search(pcm_conf, "pcm", &pcm_conf) >= 0))) 1474 return _snd_pcm_direct_get_slave_ipc_offset(root, pcm_conf, 1475 direction, 1476 hop + 1); 1477 1478 snd_config_for_each(i, next, sconf) { 1479 snd_config_t *n = snd_config_iterator_entry(i); 1480 const char *id, *str; 1481 if (snd_config_get_id(n, &id) < 0) 1482 continue; 1483 if (strcmp(id, "type") == 0) { 1484 err = snd_config_get_string(n, &str); 1485 if (err < 0) { 1486 SNDERR("Invalid value for PCM type definition\n"); 1487 return -EINVAL; 1488 } 1489 if (strcmp(str, "hw")) { 1490 SNDERR("Invalid type '%s' for slave PCM\n", str); 1491 return -EINVAL; 1492 } 1493 continue; 1494 } 1495 if (strcmp(id, "card") == 0) { 1496 err = snd_config_get_integer(n, &card); 1497 if (err < 0) { 1498 err = snd_config_get_string(n, &str); 1499 if (err < 0) { 1500 SNDERR("Invalid type for %s", id); 1501 return -EINVAL; 1502 } 1503 card = snd_card_get_index(str); 1504 if (card < 0) { 1505 SNDERR("Invalid value for %s", id); 1506 return card; 1507 } 1508 } 1509 continue; 1510 } 1511 if (strcmp(id, "device") == 0) { 1512 err = snd_config_get_integer(n, &device); 1513 if (err < 0) { 1514 SNDERR("Invalid type for %s", id); 1515 return err; 1516 } 1517 continue; 1518 } 1519 if (strcmp(id, "subdevice") == 0) { 1520 err = snd_config_get_integer(n, &subdevice); 1521 if (err < 0) { 1522 SNDERR("Invalid type for %s", id); 1523 return err; 1524 } 1525 continue; 1526 } 1527 } 1528 if (card < 0) 1529 card = 0; 1530 if (device < 0) 1531 device = 0; 1532 if (subdevice < 0) 1533 subdevice = 0; 1534 return (direction << 1) + (device << 2) + (subdevice << 8) + (card << 12); 1535} 1536 1537static int snd_pcm_direct_get_slave_ipc_offset(snd_config_t *root, 1538 snd_config_t *sconf, 1539 int direction) 1540{ 1541 return _snd_pcm_direct_get_slave_ipc_offset(root, sconf, direction, 0); 1542} 1543 1544int snd_pcm_direct_parse_open_conf(snd_config_t *root, snd_config_t *conf, 1545 int stream, struct snd_pcm_direct_open_conf *rec) 1546{ 1547 snd_config_iterator_t i, next; 1548 int ipc_key_add_uid = 0; 1549 snd_config_t *n; 1550 int err; 1551 1552 rec->slave = NULL; 1553 rec->bindings = NULL; 1554 rec->ipc_key = 0; 1555 rec->ipc_perm = 0600; 1556 rec->ipc_gid = -1; 1557 rec->slowptr = 1; 1558 rec->max_periods = 0; 1559 1560 /* read defaults */ 1561 if (snd_config_search(root, "defaults.pcm.dmix_max_periods", &n) >= 0) { 1562 long val; 1563 err = snd_config_get_integer(n, &val); 1564 if (err >= 0) 1565 rec->max_periods = val; 1566 } 1567 1568 snd_config_for_each(i, next, conf) { 1569 const char *id; 1570 n = snd_config_iterator_entry(i); 1571 if (snd_config_get_id(n, &id) < 0) 1572 continue; 1573 if (snd_pcm_conf_generic_id(id)) 1574 continue; 1575 if (strcmp(id, "ipc_key") == 0) { 1576 long key; 1577 err = snd_config_get_integer(n, &key); 1578 if (err < 0) { 1579 SNDERR("The field ipc_key must be an integer type"); 1580 1581 return err; 1582 } 1583 rec->ipc_key = key; 1584 continue; 1585 } 1586 if (strcmp(id, "ipc_perm") == 0) { 1587 long perm; 1588 err = snd_config_get_integer(n, &perm); 1589 if (err < 0) { 1590 SNDERR("Invalid type for %s", id); 1591 return err; 1592 } 1593 if ((perm & ~0777) != 0) { 1594 SNDERR("The field ipc_perm must be a valid file permission"); 1595 return -EINVAL; 1596 } 1597 rec->ipc_perm = perm; 1598 continue; 1599 } 1600 if (strcmp(id, "ipc_gid") == 0) { 1601 char *group; 1602 char *endp; 1603 err = snd_config_get_ascii(n, &group); 1604 if (err < 0) { 1605 SNDERR("The field ipc_gid must be a valid group"); 1606 return err; 1607 } 1608 if (! *group) { 1609 rec->ipc_gid = -1; 1610 free(group); 1611 continue; 1612 } 1613 if (isdigit(*group) == 0) { 1614 struct group *grp = getgrnam(group); 1615 if (grp == NULL) { 1616 SNDERR("The field ipc_gid must be a valid group (create group %s)", group); 1617 free(group); 1618 return -EINVAL; 1619 } 1620 rec->ipc_gid = grp->gr_gid; 1621 } else { 1622 rec->ipc_gid = strtol(group, &endp, 10); 1623 } 1624 free(group); 1625 continue; 1626 } 1627 if (strcmp(id, "ipc_key_add_uid") == 0) { 1628 if ((err = snd_config_get_bool(n)) < 0) { 1629 SNDERR("The field ipc_key_add_uid must be a boolean type"); 1630 return err; 1631 } 1632 ipc_key_add_uid = err; 1633 continue; 1634 } 1635 if (strcmp(id, "slave") == 0) { 1636 rec->slave = n; 1637 continue; 1638 } 1639 if (strcmp(id, "bindings") == 0) { 1640 rec->bindings = n; 1641 continue; 1642 } 1643 if (strcmp(id, "slowptr") == 0) { 1644 err = snd_config_get_bool(n); 1645 if (err < 0) 1646 return err; 1647 rec->slowptr = err; 1648 continue; 1649 } 1650 if (strcmp(id, "max_periods") == 0) { 1651 long val; 1652 err = snd_config_get_integer(n, &val); 1653 if (err < 0) 1654 return err; 1655 rec->max_periods = val; 1656 continue; 1657 } 1658 SNDERR("Unknown field %s", id); 1659 return -EINVAL; 1660 } 1661 if (!rec->slave) { 1662 SNDERR("slave is not defined"); 1663 return -EINVAL; 1664 } 1665 if (!rec->ipc_key) { 1666 SNDERR("Unique IPC key is not defined"); 1667 return -EINVAL; 1668 } 1669 if (ipc_key_add_uid) 1670 rec->ipc_key += getuid(); 1671 err = snd_pcm_direct_get_slave_ipc_offset(root, conf, stream); 1672 if (err < 0) 1673 return err; 1674 rec->ipc_key += err; 1675 1676 return 0; 1677} 1678