src/pcm/pcm_direct.c

   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
  47 union 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
  59 int 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
  91 int snd_pcm_direct_shm_create_or_connect(snd_pcm_direct_t *dmix)
  92 {
  93         struct shmid_ds buf;
  94         int tmpid, err;
  95
  96 retryget:
  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  */
 146 static 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 */
 168 int 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
 177 static 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
 187 static 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
 250 static snd_pcm_direct_t *server_job_dmix;
 251
 252 static 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
 263 static 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  */
 274 static 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
 305 static 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
 407 int 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
 445 int 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
 464 int 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
 485 int 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
 498 int 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
 504 int 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 */
 511 void 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
 540 int snd_pcm_direct_timer_stop(snd_pcm_direct_t *dmix)
 541 {
 542         snd_timer_stop(dmix->timer);
 543         snd_pcm_direct_clear_timer_queue(dmix);
 544         return 0;
 545 }
 546
 547 int snd_pcm_direct_poll_revents(snd_pcm_t *pcm, struct pollfd *pfds, unsigned int nfds, unsigned short *revents)
 548 {
 549         snd_pcm_direct_t *dmix = pcm->private_data;
 550         unsigned short events;
 551         int empty = 0;
 552
 553         assert(pfds && nfds == 1 && revents);
 554         events = pfds[0].revents;
 555         if (events & POLLIN) {
 556                 snd_pcm_uframes_t avail;
 557                 snd_pcm_avail_update(pcm);
 558                 if (pcm->stream == SND_PCM_STREAM_PLAYBACK) {
 559                         events |= POLLOUT;
 560                         events &= ~POLLIN;
 561                         avail = snd_pcm_mmap_playback_avail(pcm);
 562                 } else {
 563                         avail = snd_pcm_mmap_capture_avail(pcm);
 564                 }
 565                 empty = avail < pcm->avail_min;
 566         }
 567         switch (snd_pcm_state(dmix->spcm)) {
 568         case SND_PCM_STATE_XRUN:
 569         case SND_PCM_STATE_SUSPENDED:
 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                                 events |= POLLERR;
 581                                 break;
 582                         default:
 583                                 break;
 584                         }
 585                 }
 586                 break;
 587         }
 588         *revents = events;
 589         return 0;
 590 }
 591
 592 int snd_pcm_direct_info(snd_pcm_t *pcm, snd_pcm_info_t * info)
 593 {
 594         // snd_pcm_direct_t *dmix = pcm->private_data;
 595
 596         memset(info, 0, sizeof(*info));
 597         info->stream = pcm->stream;
 598         info->card = -1;
 599         /* FIXME: fill this with something more useful: we know the hardware name */
 600         if (pcm->name) {
 601                 strncpy((char *)info->id, pcm->name, sizeof(info->id));
 602                 strncpy((char *)info->name, pcm->name, sizeof(info->name));
 603                 strncpy((char *)info->subname, pcm->name, sizeof(info->subname));
 604         }
 605         info->subdevices_count = 1;
 606         return 0;
 607 }
 608
 609 static inline snd_mask_t *hw_param_mask(snd_pcm_hw_params_t *params,
 610                                         snd_pcm_hw_param_t var)
 611 {
 612         return &params->masks[var - SND_PCM_HW_PARAM_FIRST_MASK];
 613 }
 614
 615 static inline snd_interval_t *hw_param_interval(snd_pcm_hw_params_t *params,
 616                                                 snd_pcm_hw_param_t var)
 617 {
 618         return &params->intervals[var - SND_PCM_HW_PARAM_FIRST_INTERVAL];
 619 }
 620
 621 static int hw_param_interval_refine_one(snd_pcm_hw_params_t *params,
 622                                         snd_pcm_hw_param_t var,
 623                                         snd_interval_t *src)
 624 {
 625         snd_interval_t *i;
 626
 627         if (!(params->rmask & (1<<var)))        /* nothing to do? */
 628                 return 0;
 629         i = hw_param_interval(params, var);
 630         if (snd_interval_empty(i)) {
 631                 SNDERR("dshare interval %i empty?", (int)var);
 632                 return -EINVAL;
 633         }
 634         if (snd_interval_refine(i, src))
 635                 params->cmask |= 1<<var;
 636         return 0;
 637 }
 638
 639 static int hw_param_interval_refine_minmax(snd_pcm_hw_params_t *params,
 640                                            snd_pcm_hw_param_t var,
 641                                            unsigned int imin,
 642                                            unsigned int imax)
 643 {
 644         snd_interval_t t;
 645
 646         memset(&t, 0, sizeof(t));
 647         snd_interval_set_minmax(&t, imin, imax);
 648         t.integer = 1;
 649         return hw_param_interval_refine_one(params, var, &t);
 650 }
 651
 652 #undef REFINE_DEBUG
 653
 654 int snd_pcm_direct_hw_refine(snd_pcm_t *pcm, snd_pcm_hw_params_t *params)
 655 {
 656         snd_pcm_direct_t *dshare = pcm->private_data;
 657         static snd_mask_t access = { .bits = {
 658                                         (1<<SNDRV_PCM_ACCESS_MMAP_INTERLEAVED) |
 659                                         (1<<SNDRV_PCM_ACCESS_MMAP_NONINTERLEAVED) |
 660                                         (1<<SNDRV_PCM_ACCESS_RW_INTERLEAVED) |
 661                                         (1<<SNDRV_PCM_ACCESS_RW_NONINTERLEAVED),
 662                                         0, 0, 0 } };
 663         int err;
 664
 665 #ifdef REFINE_DEBUG
 666         snd_output_t *log;
 667         snd_output_stdio_attach(&log, stderr, 0);
 668         snd_output_puts(log, "DMIX REFINE (begin):\n");
 669         snd_pcm_hw_params_dump(params, log);
 670 #endif
 671         if (params->rmask & (1<<SND_PCM_HW_PARAM_ACCESS)) {
 672                 if (snd_mask_empty(hw_param_mask(params, SND_PCM_HW_PARAM_ACCESS))) {
 673                         SNDERR("dshare access mask empty?");
 674                         return -EINVAL;
 675                 }
 676                 if (snd_mask_refine(hw_param_mask(params, SND_PCM_HW_PARAM_ACCESS), &access))
 677                         params->cmask |= 1<<SND_PCM_HW_PARAM_ACCESS;
 678         }
 679         if (params->rmask & (1<<SND_PCM_HW_PARAM_FORMAT)) {
 680                 if (snd_mask_empty(hw_param_mask(params, SND_PCM_HW_PARAM_FORMAT))) {
 681                         SNDERR("dshare format mask empty?");
 682                         return -EINVAL;
 683                 }
 684                 if (snd_mask_refine_set(hw_param_mask(params, SND_PCM_HW_PARAM_FORMAT),
 685                                         dshare->shmptr->hw.format))
 686                         params->cmask |= 1<<SND_PCM_HW_PARAM_FORMAT;
 687         }
 688         //snd_mask_none(hw_param_mask(params, SND_PCM_HW_PARAM_SUBFORMAT));
 689         if (params->rmask & (1<<SND_PCM_HW_PARAM_CHANNELS)) {
 690                 if (snd_interval_empty(hw_param_interval(params, SND_PCM_HW_PARAM_CHANNELS))) {
 691                         SNDERR("dshare channels mask empty?");
 692                         return -EINVAL;
 693                 }
 694                 err = snd_interval_refine_set(hw_param_interval(params, SND_PCM_HW_PARAM_CHANNELS), dshare->channels);
 695                 if (err < 0)
 696                         return err;
 697         }
 698         err = hw_param_interval_refine_one(params, SND_PCM_HW_PARAM_RATE,
 699                                            &dshare->shmptr->hw.rate);
 700         if (err < 0)
 701                 return err;
 702         err = hw_param_interval_refine_one(params, SND_PCM_HW_PARAM_PERIOD_SIZE,
 703                                            &dshare->shmptr->hw.period_size);
 704         if (err < 0)
 705                 return err;
 706         err = hw_param_interval_refine_one(params, SND_PCM_HW_PARAM_PERIOD_TIME,
 707                                            &dshare->shmptr->hw.period_time);
 708         if (err < 0)
 709                 return err;
 710         if (dshare->max_periods < 0) {
 711                 err = hw_param_interval_refine_one(params, SND_PCM_HW_PARAM_BUFFER_SIZE,
 712                                                    &dshare->shmptr->hw.buffer_size);
 713                 if (err < 0)
 714                         return err;
 715                 err = hw_param_interval_refine_one(params, SND_PCM_HW_PARAM_BUFFER_TIME,
 716                                                    &dshare->shmptr->hw.buffer_time);
 717                 if (err < 0)
 718                         return err;
 719         } else if (params->rmask & ((1<<SND_PCM_HW_PARAM_PERIODS)|
 720                                     (1<<SND_PCM_HW_PARAM_BUFFER_BYTES)|
 721                                     (1<<SND_PCM_HW_PARAM_BUFFER_SIZE)|
 722                                     (1<<SND_PCM_HW_PARAM_BUFFER_TIME))) {
 723                 int changed;
 724                 unsigned int max_periods = dshare->max_periods;
 725                 if (max_periods < 2)
 726                         max_periods = dshare->slave_buffer_size / dshare->slave_period_size;
 727                 do {
 728                         changed = 0;
 729                         err = hw_param_interval_refine_minmax(params, SND_PCM_HW_PARAM_PERIODS,
 730                                                               2, max_periods);
 731                         if (err < 0)
 732                                 return err;
 733                         changed |= err;
 734                         err = snd_pcm_hw_refine_soft(pcm, params);
 735                         if (err < 0)
 736                                 return err;
 737                         changed |= err;
 738                 } while (changed);
 739         }
 740         params->info = dshare->shmptr->s.info;
 741 #ifdef REFINE_DEBUG
 742         snd_output_puts(log, "DMIX REFINE (end):\n");
 743         snd_pcm_hw_params_dump(params, log);
 744         snd_output_close(log);
 745 #endif
 746         return 0;
 747 }
 748
 749 int snd_pcm_direct_hw_params(snd_pcm_t *pcm, snd_pcm_hw_params_t * params)
 750 {
 751         snd_pcm_direct_t *dmix = pcm->private_data;
 752
 753         params->info = dmix->shmptr->s.info;
 754         params->rate_num = dmix->shmptr->s.rate;
 755         params->rate_den = 1;
 756         params->fifo_size = 0;
 757         params->msbits = dmix->shmptr->s.msbits;
 758         return 0;
 759 }
 760
 761 int snd_pcm_direct_hw_free(snd_pcm_t *pcm ATTRIBUTE_UNUSED)
 762 {
 763         /* values are cached in the pcm structure */
 764         return 0;
 765 }
 766
 767 int snd_pcm_direct_sw_params(snd_pcm_t *pcm ATTRIBUTE_UNUSED, snd_pcm_sw_params_t * params ATTRIBUTE_UNUSED)
 768 {
 769         /* values are cached in the pcm structure */
 770         return 0;
 771 }
 772
 773 int snd_pcm_direct_channel_info(snd_pcm_t *pcm, snd_pcm_channel_info_t * info)
 774 {
 775         return snd_pcm_channel_info_shm(pcm, info, -1);
 776 }
 777
 778 int snd_pcm_direct_mmap(snd_pcm_t *pcm ATTRIBUTE_UNUSED)
 779 {
 780         return 0;
 781 }
 782
 783 int snd_pcm_direct_munmap(snd_pcm_t *pcm ATTRIBUTE_UNUSED)
 784 {
 785         return 0;
 786 }
 787
 788 int snd_pcm_direct_resume(snd_pcm_t *pcm)
 789 {
 790         snd_pcm_direct_t *dmix = pcm->private_data;
 791         int err;
 792
 793         snd_pcm_direct_semaphore_down(dmix, DIRECT_IPC_SEM_CLIENT);
 794         err = snd_pcm_resume(dmix->spcm);
 795         if (err == -ENOSYS) {
 796                 /* FIXME: error handling? */
 797                 snd_pcm_prepare(dmix->spcm);
 798                 snd_pcm_start(dmix->spcm);
 799                 err = 0;
 800         }
 801         snd_pcm_direct_semaphore_up(dmix, DIRECT_IPC_SEM_CLIENT);
 802         return err;
 803 }
 804
 805 #define COPY_SLAVE(field) (dmix->shmptr->s.field = spcm->field)
 806
 807 /* copy the slave setting */
 808 static void save_slave_setting(snd_pcm_direct_t *dmix, snd_pcm_t *spcm)
 809 {
 810         spcm->info &= ~SND_PCM_INFO_PAUSE;
 811
 812         COPY_SLAVE(access);
 813         COPY_SLAVE(format);
 814         COPY_SLAVE(subformat);
 815         COPY_SLAVE(channels);
 816         COPY_SLAVE(rate);
 817         COPY_SLAVE(period_size);
 818         COPY_SLAVE(period_time);
 819         COPY_SLAVE(periods);
 820         COPY_SLAVE(tstamp_mode);
 821         COPY_SLAVE(period_step);
 822         COPY_SLAVE(avail_min);
 823         COPY_SLAVE(start_threshold);
 824         COPY_SLAVE(stop_threshold);
 825         COPY_SLAVE(silence_threshold);
 826         COPY_SLAVE(silence_size);
 827         COPY_SLAVE(boundary);
 828         COPY_SLAVE(info);
 829         COPY_SLAVE(msbits);
 830         COPY_SLAVE(rate_num);
 831         COPY_SLAVE(rate_den);
 832         COPY_SLAVE(hw_flags);
 833         COPY_SLAVE(fifo_size);
 834         COPY_SLAVE(buffer_size);
 835         COPY_SLAVE(buffer_time);
 836         COPY_SLAVE(sample_bits);
 837         COPY_SLAVE(frame_bits);
 838 }
 839
 840 #undef COPY_SLAVE
 841
 842 /*
 843  * this function initializes hardware and starts playback operation with
 844  * no stop threshold (it operates all time without xrun checking)
 845  * also, the driver silences the unused ring buffer areas for us
 846  */
 847 int snd_pcm_direct_initialize_slave(snd_pcm_direct_t *dmix, snd_pcm_t *spcm, struct slave_params *params)
 848 {
 849         snd_pcm_hw_params_t *hw_params;
 850         snd_pcm_sw_params_t *sw_params;
 851         int ret, buffer_is_not_initialized;
 852         snd_pcm_uframes_t boundary;
 853         struct pollfd fd;
 854         int loops = 10;
 855
 856         snd_pcm_hw_params_alloca(&hw_params);
 857         snd_pcm_sw_params_alloca(&sw_params);
 858
 859       __again:
 860         if (loops-- <= 0) {
 861                 SNDERR("unable to find a valid configuration for slave");
 862                 return -EINVAL;
 863         }
 864         ret = snd_pcm_hw_params_any(spcm, hw_params);
 865         if (ret < 0) {
 866                 SNDERR("snd_pcm_hw_params_any failed");
 867                 return ret;
 868         }
 869         ret = snd_pcm_hw_params_set_access(spcm, hw_params, SND_PCM_ACCESS_MMAP_INTERLEAVED);
 870         if (ret < 0) {
 871                 ret = snd_pcm_hw_params_set_access(spcm, hw_params, SND_PCM_ACCESS_MMAP_NONINTERLEAVED);
 872                 if (ret < 0) {
 873                         SNDERR("slave plugin does not support mmap interleaved or mmap noninterleaved access");
 874                         return ret;
 875                 }
 876         }
 877         ret = snd_pcm_hw_params_set_format(spcm, hw_params, params->format);
 878         if (ret < 0) {
 879                 static const snd_pcm_format_t dmix_formats[] = {
 880                         SND_PCM_FORMAT_S32,
 881                         SND_PCM_FORMAT_S32 ^ SND_PCM_FORMAT_S32_LE ^ SND_PCM_FORMAT_S32_BE,
 882                         SND_PCM_FORMAT_S16,
 883                         SND_PCM_FORMAT_S16 ^ SND_PCM_FORMAT_S16_LE ^ SND_PCM_FORMAT_S16_BE,
 884                         SND_PCM_FORMAT_S24_3LE,
 885                         SND_PCM_FORMAT_U8,
 886                 };
 887                 snd_pcm_format_t format;
 888                 unsigned int i;
 889
 890                 for (i = 0; i < sizeof dmix_formats / sizeof dmix_formats[0]; ++i) {
 891                         format = dmix_formats[i];
 892                         ret = snd_pcm_hw_params_set_format(spcm, hw_params, format);
 893                         if (ret >= 0)
 894                                 break;
 895                 }
 896                 if (ret < 0 && dmix->type != SND_PCM_TYPE_DMIX) {
 897                         /* TODO: try to choose a good format */
 898                         ret = INTERNAL(snd_pcm_hw_params_set_format_first)(spcm, hw_params, &format);
 899                 }
 900                 if (ret < 0) {
 901                         SNDERR("requested or auto-format is not available");
 902                         return ret;
 903                 }
 904                 params->format = format;
 905         }
 906         ret = INTERNAL(snd_pcm_hw_params_set_channels_near)(spcm, hw_params, (unsigned int *)&params->channels);
 907         if (ret < 0) {
 908                 SNDERR("requested count of channels is not available");
 909                 return ret;
 910         }
 911         ret = INTERNAL(snd_pcm_hw_params_set_rate_near)(spcm, hw_params, (unsigned int *)&params->rate, 0);
 912         if (ret < 0) {
 913                 SNDERR("requested rate is not available");
 914                 return ret;
 915         }
 916
 917         buffer_is_not_initialized = 0;
 918         if (params->buffer_time > 0) {
 919                 ret = INTERNAL(snd_pcm_hw_params_set_buffer_time_near)(spcm, hw_params, (unsigned int *)&params->buffer_time, 0);
 920                 if (ret < 0) {
 921                         SNDERR("unable to set buffer time");
 922                         return ret;
 923                 }
 924         } else if (params->buffer_size > 0) {
 925                 ret = INTERNAL(snd_pcm_hw_params_set_buffer_size_near)(spcm, hw_params, (snd_pcm_uframes_t *)&params->buffer_size);
 926                 if (ret < 0) {
 927                         SNDERR("unable to set buffer size");
 928                         return ret;
 929                 }
 930         } else {
 931                 buffer_is_not_initialized = 1;
 932         }
 933
 934         if (params->period_time > 0) {
 935                 ret = INTERNAL(snd_pcm_hw_params_set_period_time_near)(spcm, hw_params, (unsigned int *)&params->period_time, 0);
 936                 if (ret < 0) {
 937                         SNDERR("unable to set period_time");
 938                         return ret;
 939                 }
 940         } else if (params->period_size > 0) {
 941                 ret = INTERNAL(snd_pcm_hw_params_set_period_size_near)(spcm, hw_params, (snd_pcm_uframes_t *)&params->period_size, 0);
 942                 if (ret < 0) {
 943                         SNDERR("unable to set period_size");
 944                         return ret;
 945                 }
 946         }
 947
 948         if (buffer_is_not_initialized && params->periods > 0) {
 949                 unsigned int periods = params->periods;
 950                 ret = INTERNAL(snd_pcm_hw_params_set_periods_near)(spcm, hw_params, &params->periods, 0);
 951                 if (ret < 0) {
 952                         SNDERR("unable to set requested periods");
 953                         return ret;
 954                 }
 955                 if (params->periods == 1) {
 956                         params->periods = periods;
 957                         if (params->period_time > 0) {
 958                                 params->period_time /= 2;
 959                                 goto __again;
 960                         } else if (params->period_size > 0) {
 961                                 params->period_size /= 2;
 962                                 goto __again;
 963                         }
 964                         SNDERR("unable to use stream with periods == 1");
 965                         return ret;
 966                 }
 967         }
 968
 969         ret = snd_pcm_hw_params(spcm, hw_params);
 970         if (ret < 0) {
 971                 SNDERR("unable to install hw params");
 972                 return ret;
 973         }
 974
 975         /* store some hw_params values to shared info */
 976         dmix->shmptr->hw.format = snd_mask_value(hw_param_mask(hw_params, SND_PCM_HW_PARAM_FORMAT));
 977         dmix->shmptr->hw.rate = *hw_param_interval(hw_params, SND_PCM_HW_PARAM_RATE);
 978         dmix->shmptr->hw.buffer_size = *hw_param_interval(hw_params, SND_PCM_HW_PARAM_BUFFER_SIZE);
 979         dmix->shmptr->hw.buffer_time = *hw_param_interval(hw_params, SND_PCM_HW_PARAM_BUFFER_TIME);
 980         dmix->shmptr->hw.period_size = *hw_param_interval(hw_params, SND_PCM_HW_PARAM_PERIOD_SIZE);
 981         dmix->shmptr->hw.period_time = *hw_param_interval(hw_params, SND_PCM_HW_PARAM_PERIOD_TIME);
 982         dmix->shmptr->hw.periods = *hw_param_interval(hw_params, SND_PCM_HW_PARAM_PERIODS);
 983
 984
 985         ret = snd_pcm_sw_params_current(spcm, sw_params);
 986         if (ret < 0) {
 987                 SNDERR("unable to get current sw_params");
 988                 return ret;
 989         }
 990
 991         ret = snd_pcm_sw_params_get_boundary(sw_params, &boundary);
 992         if (ret < 0) {
 993                 SNDERR("unable to get boundary");
 994                 return ret;
 995         }
 996         ret = snd_pcm_sw_params_set_stop_threshold(spcm, sw_params, boundary);
 997         if (ret < 0) {
 998                 SNDERR("unable to set stop threshold");
 999                 return ret;
1000         }
1001
1002         /* set timestamp mode to MMAP
1003          * the slave timestamp is copied appropriately in dsnoop/dmix/dshare
1004          * based on the tstamp_mode of each client
1005          */
1006         ret = snd_pcm_sw_params_set_tstamp_mode(spcm, sw_params,
1007                                                 SND_PCM_TSTAMP_ENABLE);
1008         if (ret < 0) {
1009                 SNDERR("unable to tstamp mode MMAP");
1010                 return ret;
1011         }
1012
1013         if (dmix->type != SND_PCM_TYPE_DMIX)
1014                 goto __skip_silencing;
1015
1016         ret = snd_pcm_sw_params_set_silence_threshold(spcm, sw_params, 0);
1017         if (ret < 0) {
1018                 SNDERR("unable to set silence threshold");
1019                 return ret;
1020         }
1021         ret = snd_pcm_sw_params_set_silence_size(spcm, sw_params, boundary);
1022         if (ret < 0) {
1023                 SNDERR("unable to set silence threshold (please upgrade to 0.9.0rc8+ driver)");
1024                 return ret;
1025         }
1026
1027       __skip_silencing:
1028
1029         ret = snd_pcm_sw_params(spcm, sw_params);
1030         if (ret < 0) {
1031                 SNDERR("unable to install sw params (please upgrade to 0.9.0rc8+ driver)");
1032                 return ret;
1033         }
1034
1035         if (dmix->type == SND_PCM_TYPE_DSHARE) {
1036                 const snd_pcm_channel_area_t *dst_areas;
1037                 dst_areas = snd_pcm_mmap_areas(spcm);
1038                 snd_pcm_areas_silence(dst_areas, 0, spcm->channels, spcm->buffer_size, spcm->format);
1039         }
1040
1041         ret = snd_pcm_start(spcm);
1042         if (ret < 0) {
1043                 SNDERR("unable to start PCM stream");
1044                 return ret;
1045         }
1046
1047         if (snd_pcm_poll_descriptors_count(spcm) != 1) {
1048                 SNDERR("unable to use hardware pcm with fd more than one!!!");
1049                 return ret;
1050         }
1051         snd_pcm_poll_descriptors(spcm, &fd, 1);
1052         dmix->hw_fd = fd.fd;
1053
1054         save_slave_setting(dmix, spcm);
1055
1056         /* Currently, we assume that each dmix client has the same
1057          * hw_params setting.
1058          * If the arbitrary hw_parmas is supported in future,
1059          * boundary has to be taken from the slave config but
1060          * recalculated for the native boundary size (for 32bit
1061          * emulation on 64bit arch).
1062          */
1063         dmix->slave_buffer_size = spcm->buffer_size;
1064         dmix->slave_period_size = spcm->period_size;
1065         dmix->slave_boundary = spcm->boundary;
1066
1067         spcm->donot_close = 1;
1068
1069         {
1070                 int ver = 0;
1071                 ioctl(spcm->poll_fd, SNDRV_PCM_IOCTL_PVERSION, &ver);
1072                 if (ver < SNDRV_PROTOCOL_VERSION(2, 0, 8))
1073                         dmix->shmptr->use_server = 1;
1074         }
1075
1076         return 0;
1077 }
1078
1079 /*
1080  * the trick is used here; we cannot use effectively the hardware handle because
1081  * we cannot drive multiple accesses to appl_ptr; so we use slave timer of given
1082  * PCM hardware handle; it's not this easy and cheap?
1083  */
1084 int snd_pcm_direct_initialize_poll_fd(snd_pcm_direct_t *dmix)
1085 {
1086         int ret;
1087         snd_pcm_info_t *info;
1088         char name[128];
1089         int capture = dmix->type == SND_PCM_TYPE_DSNOOP ? 1 : 0;
1090
1091         dmix->tread = 1;
1092         dmix->timer_need_poll = 0;
1093         snd_pcm_info_alloca(&info);
1094         ret = snd_pcm_info(dmix->spcm, info);
1095         if (ret < 0) {
1096                 SNDERR("unable to info for slave pcm");
1097                 return ret;
1098         }
1099         sprintf(name, "hw:CLASS=%i,SCLASS=0,CARD=%i,DEV=%i,SUBDEV=%i",
1100                                 (int)SND_TIMER_CLASS_PCM,
1101                                 snd_pcm_info_get_card(info),
1102                                 snd_pcm_info_get_device(info),
1103                                 snd_pcm_info_get_subdevice(info) * 2 + capture);
1104         ret = snd_timer_open(&dmix->timer, name, SND_TIMER_OPEN_NONBLOCK | SND_TIMER_OPEN_TREAD);
1105         if (ret < 0) {
1106                 dmix->tread = 1;
1107                 ret = snd_timer_open(&dmix->timer, name, SND_TIMER_OPEN_NONBLOCK);
1108                 if (ret < 0) {
1109                         SNDERR("unable to open timer '%s'", name);
1110                         return ret;
1111                 }
1112         }
1113
1114         if (snd_timer_poll_descriptors_count(dmix->timer) != 1) {
1115                 SNDERR("unable to use timer '%s' with more than one fd!", name);
1116                 return ret;
1117         }
1118         snd_timer_poll_descriptors(dmix->timer, &dmix->timer_fd, 1);
1119         dmix->poll_fd = dmix->timer_fd.fd;
1120
1121         dmix->timer_event_suspend = 1<<SND_TIMER_EVENT_MSUSPEND;
1122         dmix->timer_event_resume = 1<<SND_TIMER_EVENT_MRESUME;
1123
1124         /*
1125          * Some hacks for older kernel drivers
1126          */
1127         {
1128                 int ver = 0;
1129                 ioctl(dmix->poll_fd, SNDRV_TIMER_IOCTL_PVERSION, &ver);
1130                 /* In older versions, check via poll before read() is needed
1131                  * because of the confliction between TIMER_START and
1132                  * FIONBIO ioctls.
1133                  */
1134                 if (ver < SNDRV_PROTOCOL_VERSION(2, 0, 4))
1135                         dmix->timer_need_poll = 1;
1136                 /*
1137                  * In older versions, timer uses pause events instead
1138                  * suspend/resume events.
1139                  */
1140                 if (ver < SNDRV_PROTOCOL_VERSION(2, 0, 5)) {
1141                         dmix->timer_event_suspend = 1<<SND_TIMER_EVENT_MPAUSE;
1142                         dmix->timer_event_resume = 1<<SND_TIMER_EVENT_MCONTINUE;
1143                 }
1144         }
1145         return 0;
1146 }
1147
1148 static snd_pcm_uframes_t recalc_boundary_size(unsigned long long bsize, snd_pcm_uframes_t buffer_size)
1149 {
1150         if (bsize > LONG_MAX) {
1151                 bsize = buffer_size;
1152                 while (bsize * 2 <= LONG_MAX - buffer_size)
1153                         bsize *= 2;
1154         }
1155         return (snd_pcm_uframes_t)bsize;
1156 }
1157
1158 #define COPY_SLAVE(field) (spcm->field = dmix->shmptr->s.field)
1159
1160 /* copy the slave setting */
1161 static void copy_slave_setting(snd_pcm_direct_t *dmix, snd_pcm_t *spcm)
1162 {
1163         COPY_SLAVE(access);
1164         COPY_SLAVE(format);
1165         COPY_SLAVE(subformat);
1166         COPY_SLAVE(channels);
1167         COPY_SLAVE(rate);
1168         COPY_SLAVE(period_size);
1169         COPY_SLAVE(period_time);
1170         COPY_SLAVE(periods);
1171         COPY_SLAVE(tstamp_mode);
1172         COPY_SLAVE(period_step);
1173         COPY_SLAVE(avail_min);
1174         COPY_SLAVE(start_threshold);
1175         COPY_SLAVE(stop_threshold);
1176         COPY_SLAVE(silence_threshold);
1177         COPY_SLAVE(silence_size);
1178         COPY_SLAVE(boundary);
1179         COPY_SLAVE(info);
1180         COPY_SLAVE(msbits);
1181         COPY_SLAVE(rate_num);
1182         COPY_SLAVE(rate_den);
1183         COPY_SLAVE(hw_flags);
1184         COPY_SLAVE(fifo_size);
1185         COPY_SLAVE(buffer_size);
1186         COPY_SLAVE(buffer_time);
1187         COPY_SLAVE(sample_bits);
1188         COPY_SLAVE(frame_bits);
1189
1190         spcm->info &= ~SND_PCM_INFO_PAUSE;
1191         spcm->boundary = recalc_boundary_size(dmix->shmptr->s.boundary, spcm->buffer_size);
1192 }
1193
1194 #undef COPY_SLAVE
1195
1196
1197 /*
1198  * open a slave PCM as secondary client (dup'ed fd)
1199  */
1200 int snd_pcm_direct_open_secondary_client(snd_pcm_t **spcmp, snd_pcm_direct_t *dmix, const char *client_name)
1201 {
1202         int ret;
1203         snd_pcm_t *spcm;
1204
1205         ret = snd_pcm_hw_open_fd(spcmp, client_name, dmix->hw_fd, 0, 0);
1206         if (ret < 0) {
1207                 SNDERR("unable to open hardware");
1208                 return ret;
1209         }
1210
1211         spcm = *spcmp;
1212         spcm->donot_close = 1;
1213         spcm->setup = 1;
1214
1215         copy_slave_setting(dmix, spcm);
1216
1217         /* Use the slave setting as SPCM, so far */
1218         dmix->slave_buffer_size = spcm->buffer_size;
1219         dmix->slave_period_size = dmix->shmptr->s.period_size;
1220         dmix->slave_boundary = spcm->boundary;
1221
1222         ret = snd_pcm_mmap(spcm);
1223         if (ret < 0) {
1224                 SNDERR("unable to mmap channels");
1225                 return ret;
1226         }
1227         return 0;
1228 }
1229
1230 /*
1231  * open a slave PCM as secondary client (dup'ed fd)
1232  */
1233 int snd_pcm_direct_initialize_secondary_slave(snd_pcm_direct_t *dmix,
1234                                               snd_pcm_t *spcm,
1235                                               struct slave_params *params ATTRIBUTE_UNUSED)
1236 {
1237         int ret;
1238
1239         spcm->donot_close = 1;
1240         spcm->setup = 1;
1241
1242         copy_slave_setting(dmix, spcm);
1243
1244         /* Use the slave setting as SPCM, so far */
1245         dmix->slave_buffer_size = spcm->buffer_size;
1246         dmix->slave_period_size = dmix->shmptr->s.period_size;
1247         dmix->slave_boundary = spcm->boundary;
1248
1249         ret = snd_pcm_mmap(spcm);
1250         if (ret < 0) {
1251                 SNDERR("unable to mmap channels");
1252                 return ret;
1253         }
1254         return 0;
1255 }
1256
1257 int snd_pcm_direct_set_timer_params(snd_pcm_direct_t *dmix)
1258 {
1259         snd_timer_params_t *params;
1260         unsigned int filter;
1261         int ret;
1262
1263         snd_timer_params_alloca(&params);
1264         snd_timer_params_set_auto_start(params, 1);
1265         if (dmix->type != SND_PCM_TYPE_DSNOOP)
1266                 snd_timer_params_set_early_event(params, 1);
1267         snd_timer_params_set_ticks(params, 1);
1268         if (dmix->tread) {
1269                 filter = (1<<SND_TIMER_EVENT_TICK) |
1270                          dmix->timer_event_suspend |
1271                          dmix->timer_event_resume;
1272                 snd_timer_params_set_filter(params, filter);
1273         }
1274         ret = snd_timer_params(dmix->timer, params);
1275         if (ret < 0) {
1276                 SNDERR("unable to set timer parameters");
1277                 return ret;
1278         }
1279         return 0;
1280 }
1281
1282 /*
1283  *  ring buffer operation
1284  */
1285 int snd_pcm_direct_check_interleave(snd_pcm_direct_t *dmix, snd_pcm_t *pcm)
1286 {
1287         unsigned int chn, channels;
1288         int bits, interleaved = 1;
1289         const snd_pcm_channel_area_t *dst_areas;
1290         const snd_pcm_channel_area_t *src_areas;
1291
1292         bits = snd_pcm_format_physical_width(dmix->type);
1293         if ((bits % 8) != 0)
1294                 interleaved = 0;
1295         channels = dmix->channels;
1296         dst_areas = snd_pcm_mmap_areas(dmix->spcm);
1297         src_areas = snd_pcm_mmap_areas(pcm);
1298         for (chn = 1; chn < channels; chn++) {
1299                 if (dst_areas[chn-1].addr != dst_areas[chn].addr) {
1300                         interleaved = 0;
1301                         break;
1302                 }
1303                 if (src_areas[chn-1].addr != src_areas[chn].addr) {
1304                         interleaved = 0;
1305                         break;
1306                 }
1307         }
1308         for (chn = 0; chn < channels; chn++) {
1309                 if (dmix->bindings && dmix->bindings[chn] != chn) {
1310                         interleaved = 0;
1311                         break;
1312                 }
1313                 if (dst_areas[chn].first != chn * bits ||
1314                     dst_areas[chn].step != channels * bits) {
1315                         interleaved = 0;
1316                         break;
1317                 }
1318                 if (src_areas[chn].first != chn * bits ||
1319                     src_areas[chn].step != channels * bits) {
1320                         interleaved = 0;
1321                         break;
1322                 }
1323         }
1324         return dmix->interleaved = interleaved;
1325 }
1326
1327 /*
1328  * parse the channel map
1329  * id == client channel
1330  * value == slave's channel
1331  */
1332 int snd_pcm_direct_parse_bindings(snd_pcm_direct_t *dmix,
1333                                   struct slave_params *params,
1334                                   snd_config_t *cfg)
1335 {
1336         snd_config_iterator_t i, next;
1337         unsigned int chn, chn1, count = 0;
1338         unsigned int *bindings;
1339         int err;
1340
1341         dmix->channels = UINT_MAX;
1342         if (cfg == NULL)
1343                 return 0;
1344         if (snd_config_get_type(cfg) != SND_CONFIG_TYPE_COMPOUND) {
1345                 SNDERR("invalid type for bindings");
1346                 return -EINVAL;
1347         }
1348         snd_config_for_each(i, next, cfg) {
1349                 snd_config_t *n = snd_config_iterator_entry(i);
1350                 const char *id;
1351                 long cchannel;
1352                 if (snd_config_get_id(n, &id) < 0)
1353                         continue;
1354                 err = safe_strtol(id, &cchannel);
1355                 if (err < 0 || cchannel < 0) {
1356                         SNDERR("invalid client channel in binding: %s\n", id);
1357                         return -EINVAL;
1358                 }
1359                 if ((unsigned)cchannel >= count)
1360                         count = cchannel + 1;
1361         }
1362         if (count == 0)
1363                 return 0;
1364         if (count > 1024) {
1365                 SNDERR("client channel out of range");
1366                 return -EINVAL;
1367         }
1368         bindings = malloc(count * sizeof(unsigned int));
1369         if (bindings == NULL)
1370                 return -ENOMEM;
1371         for (chn = 0; chn < count; chn++)
1372                 bindings[chn] = UINT_MAX;               /* don't route */
1373         snd_config_for_each(i, next, cfg) {
1374                 snd_config_t *n = snd_config_iterator_entry(i);
1375                 const char *id;
1376                 long cchannel, schannel;
1377                 if (snd_config_get_id(n, &id) < 0)
1378                         continue;
1379                 safe_strtol(id, &cchannel);
1380                 if (snd_config_get_integer(n, &schannel) < 0) {
1381                         SNDERR("unable to get slave channel (should be integer type) in binding: %s\n", id);
1382                         free(bindings);
1383                         return -EINVAL;
1384                 }
1385                 if (schannel < 0 || schannel >= params->channels) {
1386                         SNDERR("invalid slave channel number %ld in binding to %ld",
1387                                schannel, cchannel);
1388                         free(bindings);
1389                         return -EINVAL;
1390                 }
1391                 bindings[cchannel] = schannel;
1392         }
1393         if (dmix->type == SND_PCM_TYPE_DSNOOP ||
1394             ! dmix->bindings)
1395                 goto __skip_same_dst;
1396         for (chn = 0; chn < count; chn++) {
1397                 for (chn1 = 0; chn1 < count; chn1++) {
1398                         if (chn == chn1)
1399                                 continue;
1400                         if (bindings[chn] == dmix->bindings[chn1]) {
1401                                 SNDERR("unable to route channels %d,%d to same destination %d", chn, chn1, bindings[chn]);
1402                                 free(bindings);
1403                                 return -EINVAL;
1404                         }
1405                 }
1406         }
1407       __skip_same_dst:
1408         dmix->bindings = bindings;
1409         dmix->channels = count;
1410         return 0;
1411 }
1412
1413 /*
1414  * parse slave config and calculate the ipc_key offset
1415  */
1416
1417 static int _snd_pcm_direct_get_slave_ipc_offset(snd_config_t *root,
1418                                                 snd_config_t *sconf,
1419                                                 int direction,
1420                                                 int hop)
1421 {
1422         snd_config_iterator_t i, next;
1423         snd_config_t *pcm_conf;
1424         int err;
1425         long card = 0, device = 0, subdevice = 0;
1426         const char *str;
1427
1428         if (snd_config_get_string(sconf, &str) >= 0) {
1429                 if (hop > SND_CONF_MAX_HOPS) {
1430                         SNDERR("Too many definition levels (looped?)");
1431                         return -EINVAL;
1432                 }
1433                 err = snd_config_search_definition(root, "pcm", str, &pcm_conf);
1434                 if (err < 0) {
1435                         SNDERR("Unknown slave PCM %s", str);
1436                         return err;
1437                 }
1438                 err = _snd_pcm_direct_get_slave_ipc_offset(root, pcm_conf,
1439                                                            direction,
1440                                                            hop + 1);
1441                 snd_config_delete(pcm_conf);
1442                 return err;
1443         }
1444
1445 #if 0   /* for debug purposes */
1446         {
1447                 snd_output_t *out;
1448                 snd_output_stdio_attach(&out, stderr, 0);
1449                 snd_config_save(sconf, out);
1450                 snd_output_close(out);
1451         }
1452 #endif
1453
1454         if (snd_config_search(sconf, "slave", &pcm_conf) >= 0 &&
1455             snd_config_search(pcm_conf, "pcm", &pcm_conf) >= 0)
1456                 return _snd_pcm_direct_get_slave_ipc_offset(root, pcm_conf,
1457                                                             direction,
1458                                                             hop + 1);
1459
1460         snd_config_for_each(i, next, sconf) {
1461                 snd_config_t *n = snd_config_iterator_entry(i);
1462                 const char *id, *str;
1463                 if (snd_config_get_id(n, &id) < 0)
1464                         continue;
1465                 if (strcmp(id, "type") == 0) {
1466                         err = snd_config_get_string(n, &str);
1467                         if (err < 0) {
1468                                 SNDERR("Invalid value for PCM type definition\n");
1469                                 return -EINVAL;
1470                         }
1471                         if (strcmp(str, "hw")) {
1472                                 SNDERR("Invalid type '%s' for slave PCM\n", str);
1473                                 return -EINVAL;
1474                         }
1475                         continue;
1476                 }
1477                 if (strcmp(id, "card") == 0) {
1478                         err = snd_config_get_integer(n, &card);
1479                         if (err < 0) {
1480                                 err = snd_config_get_string(n, &str);
1481                                 if (err < 0) {
1482                                         SNDERR("Invalid type for %s", id);
1483                                         return -EINVAL;
1484                                 }
1485                                 card = snd_card_get_index(str);
1486                                 if (card < 0) {
1487                                         SNDERR("Invalid value for %s", id);
1488                                         return card;
1489                                 }
1490                         }
1491                         continue;
1492                 }
1493                 if (strcmp(id, "device") == 0) {
1494                         err = snd_config_get_integer(n, &device);
1495                         if (err < 0) {
1496                                 SNDERR("Invalid type for %s", id);
1497                                 return err;
1498                         }
1499                         continue;
1500                 }
1501                 if (strcmp(id, "subdevice") == 0) {
1502                         err = snd_config_get_integer(n, &subdevice);
1503                         if (err < 0) {
1504                                 SNDERR("Invalid type for %s", id);
1505                                 return err;
1506                         }
1507                         continue;
1508                 }
1509         }
1510         if (card < 0)
1511                 card = 0;
1512         if (device < 0)
1513                 device = 0;
1514         if (subdevice < 0)
1515                 subdevice = 0;
1516         return (direction << 1) + (device << 2) + (subdevice << 8) + (card << 12);
1517 }
1518
1519 static int snd_pcm_direct_get_slave_ipc_offset(snd_config_t *root,
1520                                         snd_config_t *sconf,
1521                                         int direction)
1522 {
1523         return _snd_pcm_direct_get_slave_ipc_offset(root, sconf, direction, 0);
1524 }
1525
1526 int snd_pcm_direct_parse_open_conf(snd_config_t *root, snd_config_t *conf,
1527                                    int stream, struct snd_pcm_direct_open_conf *rec)
1528 {
1529         snd_config_iterator_t i, next;
1530         int ipc_key_add_uid = 0;
1531         snd_config_t *n;
1532         int err;
1533
1534         rec->slave = NULL;
1535         rec->bindings = NULL;
1536         rec->ipc_key = 0;
1537         rec->ipc_perm = 0600;
1538         rec->ipc_gid = -1;
1539         rec->slowptr = 1;
1540         rec->max_periods = 0;
1541
1542         /* read defaults */
1543         if (snd_config_search(root, "defaults.pcm.dmix_max_periods", &n) >= 0) {
1544                 long val;
1545                 err = snd_config_get_integer(n, &val);
1546                 if (err >= 0)
1547                         rec->max_periods = val;
1548         }
1549
1550         snd_config_for_each(i, next, conf) {
1551                 const char *id;
1552                 n = snd_config_iterator_entry(i);
1553                 if (snd_config_get_id(n, &id) < 0)
1554                         continue;
1555                 if (snd_pcm_conf_generic_id(id))
1556                         continue;
1557                 if (strcmp(id, "ipc_key") == 0) {
1558                         long key;
1559                         err = snd_config_get_integer(n, &key);
1560                         if (err < 0) {
1561                                 SNDERR("The field ipc_key must be an integer type");
1562
1563                                 return err;
1564                         }
1565                         rec->ipc_key = key;
1566                         continue;
1567                 }
1568                 if (strcmp(id, "ipc_perm") == 0) {
1569                         long perm;
1570                         err = snd_config_get_integer(n, &perm);
1571                         if (err < 0) {
1572                                 SNDERR("Invalid type for %s", id);
1573                                 return err;
1574                         }
1575                         if ((perm & ~0777) != 0) {
1576                                 SNDERR("The field ipc_perm must be a valid file permission");
1577                                 return -EINVAL;
1578                         }
1579                         rec->ipc_perm = perm;
1580                         continue;
1581                 }
1582                 if (strcmp(id, "ipc_gid") == 0) {
1583                         char *group;
1584                         char *endp;
1585                         err = snd_config_get_ascii(n, &group);
1586                         if (err < 0) {
1587                                 SNDERR("The field ipc_gid must be a valid group");
1588                                 return err;
1589                         }
1590                         if (! *group) {
1591                                 rec->ipc_gid = -1;
1592                                 free(group);
1593                                 continue;
1594                         }
1595                         if (isdigit(*group) == 0) {
1596                                 struct group *grp = getgrnam(group);
1597                                 if (grp == NULL) {
1598                                         SNDERR("The field ipc_gid must be a valid group (create group %s)", group);
1599                                         free(group);
1600                                         return -EINVAL;
1601                                 }
1602                                 rec->ipc_gid = grp->gr_gid;
1603                         } else {
1604                                 rec->ipc_gid = strtol(group, &endp, 10);
1605                         }
1606                         free(group);
1607                         continue;
1608                 }
1609                 if (strcmp(id, "ipc_key_add_uid") == 0) {
1610                         if ((err = snd_config_get_bool(n)) < 0) {
1611                                 SNDERR("The field ipc_key_add_uid must be a boolean type");
1612                                 return err;
1613                         }
1614                         ipc_key_add_uid = err;
1615                         continue;
1616                 }
1617                 if (strcmp(id, "slave") == 0) {
1618                         rec->slave = n;
1619                         continue;
1620                 }
1621                 if (strcmp(id, "bindings") == 0) {
1622                         rec->bindings = n;
1623                         continue;
1624                 }
1625                 if (strcmp(id, "slowptr") == 0) {
1626                         err = snd_config_get_bool(n);
1627                         if (err < 0)
1628                                 return err;
1629                         rec->slowptr = err;
1630                         continue;
1631                 }
1632                 if (strcmp(id, "max_periods") == 0) {
1633                         long val;
1634                         err = snd_config_get_integer(n, &val);
1635                         if (err < 0)
1636                                 return err;
1637                         rec->max_periods = val;
1638                         continue;
1639                 }
1640                 SNDERR("Unknown field %s", id);
1641                 return -EINVAL;
1642         }
1643         if (!rec->slave) {
1644                 SNDERR("slave is not defined");
1645                 return -EINVAL;
1646         }
1647         if (!rec->ipc_key) {
1648                 SNDERR("Unique IPC key is not defined");
1649                 return -EINVAL;
1650         }
1651         if (ipc_key_add_uid)
1652                 rec->ipc_key += getuid();
1653         err = snd_pcm_direct_get_slave_ipc_offset(root, conf, stream);
1654         if (err < 0)
1655                 return err;
1656         rec->ipc_key += err;
1657
1658         return 0;
1659 }