audiod.c

   1 /*
   2  * Copyright (C) 2005-2006 Andre Noll <noll@mathematik.tu-darmstadt.de>
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     This program is distributed in the hope that it will be useful,
  10  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *     GNU General Public License for more details.
  13  *
  14  *     You should have received a copy of the GNU General Public License
  15  *     along with this program; if not, write to the Free Software
  16  *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  17  */
  18
  19 /** \file audiod.c the paraslash's audio daemon */
  20
  21 #include "para.h"
  22
  23 #include "audiod.cmdline.h"
  24 #include "list.h"
  25 #include "close_on_fork.h"
  26 #include "sched.h"
  27 #include "recv.h"
  28 #include "filter.h"
  29 #include "grab_client.cmdline.h"
  30 #include "grab_client.h"
  31
  32 #include "error.h"
  33 #include "audiod.h"
  34 #include "net.h"
  35 #include "daemon.h"
  36 #include "string.h"
  37 #include "fd.h"
  38 #include "write.h"
  39 #include "write_common.h"
  40
  41 /** define the array of error lists needed by para_audiod */
  42 INIT_AUDIOD_ERRLISTS;
  43 /** define the array containing all supported audio formats */
  44 DEFINE_AUDIO_FORMAT_ARRAY;
  45
  46 /** defines how to handle one supported audio format */
  47 struct audio_format_info {
  48         /** pointer to the receiver for this audio format */
  49         struct receiver *receiver;
  50         /** the receiver configuration */
  51         void *receiver_conf;
  52         /** the number of filters that should be activated for this audio format */
  53         unsigned int num_filters;
  54         /** pointer to the array of filters to be activated */
  55         struct filter **filters;
  56         /** pointer to the array of filter configurations */
  57         void **filter_conf;
  58         /** the number of filters that should be activated for this audio format */
  59         unsigned int num_writers;
  60         /** pointer to the array of writers to be activated */
  61         struct writer **writers;
  62         /** pointer to the array of writer configurations */
  63         void **writer_conf;
  64         /** do not start receiver/filters/writer before this time */
  65         struct timeval restart_barrier;
  66 };
  67
  68 struct slot_info slot[MAX_STREAM_SLOTS];
  69
  70
  71 int audiod_status = AUDIOD_ON;
  72
  73 struct gengetopt_args_info conf;
  74 static char *socket_name;
  75 static FILE *logfile;
  76 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
  77
  78 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
  79
  80 static struct status_task status_task_struct;
  81 struct status_task *stat_task = &status_task_struct;
  82
  83 /**
  84  * the task for handling audiod commands
  85  *
  86  * \sa struct task, struct sched
  87  */
  88 struct command_task {
  89         /** the local listening socket */
  90         int fd;
  91         /** the associated task structure */
  92         struct task task;
  93 };
  94
  95 struct signal_task {
  96         int fd;
  97         int signum;
  98         struct task task;
  99 };
 100
 101 /** iterate over all supported audio formats */
 102 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 103
 104 /**
 105  * get the audio format number
 106  * \param name the name of the audio format
 107  *
 108  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 109  * \a name is not a supported audio format.
 110  */
 111 int get_audio_format_num(char *name)
 112 {
 113         int i;
 114         FOR_EACH_AUDIO_FORMAT(i)
 115                 if (!strcmp(name, audio_formats[i]))
 116                         return i;
 117         return -E_UNSUPPORTED_AUDIO_FORMAT;
 118 }
 119
 120 /*
 121  * log function. first argument is loglevel.
 122  */
 123 void para_log(int ll, const char* fmt,...)
 124 {
 125         va_list argp;
 126         FILE *outfd;
 127         struct tm *tm;
 128         time_t t1;
 129         char str[MAXLINE] = "";
 130         static char *hostname;
 131
 132         if (ll < conf.loglevel_arg)
 133                 return;
 134         if (!hostname)
 135                 hostname = para_hostname();
 136         outfd = logfile? logfile : stderr;
 137         time(&t1);
 138         tm = localtime(&t1);
 139         strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
 140         fprintf(outfd, "%s %s ", str, hostname);
 141         if (conf.loglevel_arg <= INFO)
 142                 fprintf(outfd, "%i ", ll);
 143         va_start(argp, fmt);
 144         vfprintf(outfd, fmt, argp);
 145         va_end(argp);
 146 }
 147
 148 static char *configfile_exists(void)
 149 {
 150         static char *config_file;
 151
 152         if (!config_file) {
 153                 char *home = para_homedir();
 154                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 155                 free(home);
 156         }
 157         return file_exists(config_file)? config_file : NULL;
 158 }
 159
 160 static void setup_signal_handling(void)
 161 {
 162         sig_task->fd = para_signal_init();
 163         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 164         para_install_sighandler(SIGINT);
 165         para_install_sighandler(SIGTERM);
 166         para_install_sighandler(SIGCHLD);
 167         para_install_sighandler(SIGHUP);
 168         para_install_sighandler(SIGPIPE);
 169 //      signal(SIGPIPE, SIG_IGN);
 170 }
 171
 172 static void clear_slot(int slot_num)
 173 {
 174         struct slot_info *s = &slot[slot_num];
 175
 176         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 177         memset(s, 0, sizeof(struct slot_info));
 178         s->format = -1;
 179 }
 180
 181 static void close_receiver(int slot_num)
 182 {
 183         struct slot_info *s = &slot[slot_num];
 184         struct audio_format_info *a;
 185         const struct timeval restart_delay = {0, 200 * 1000};
 186
 187         if (s->format < 0 || !s->receiver_node)
 188                 return;
 189         a = &afi[s->format];
 190         PARA_NOTICE_LOG("closing %s receiver in slot %d (eof = %d)\n",
 191                 audio_formats[s->format] , slot_num, s->receiver_node->eof);
 192 //      if (!s->receiver_node->eof)
 193 //              unregister_task(&s->receiver_node->task);
 194         a->receiver->close(s->receiver_node);
 195         free(s->receiver_node);
 196         s->receiver_node = NULL;
 197         /* set restart barrier */
 198         tv_add(now, &restart_delay, &afi[s->format].restart_barrier);
 199 }
 200
 201 static void kill_all_decoders(void)
 202 {
 203         int i;
 204
 205         FOR_EACH_SLOT(i) {
 206                 struct slot_info *s = &slot[i];
 207                 if (s->wng && !s->wng->eof) {
 208                         PARA_INFO_LOG("unregistering writer node group in slot %d\n",
 209                                 i);
 210                         wng_unregister(s->wng);
 211                         s->wng->eof = 1;
 212                 }
 213                 if (s->fc && !s->fc->eof) {
 214                         PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
 215                         unregister_task(&s->fc->task);
 216                         s->fc->eof = 1;
 217                 }
 218                 if (s->receiver_node && !s->receiver_node->eof) {
 219                         PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
 220                         unregister_task(&s->receiver_node->task);
 221                         s->receiver_node->eof = 1;
 222                 }
 223         }
 224 }
 225
 226 static int get_empty_slot(void)
 227 {
 228         int i;
 229         struct slot_info *s;
 230
 231         FOR_EACH_SLOT(i) {
 232                 s = &slot[i];
 233                 if (s->format < 0) {
 234                         clear_slot(i);
 235                         return i;
 236                 }
 237                 if (s->wng || s->receiver_node || s->fc)
 238                         continue;
 239                 clear_slot(i);
 240                 return i;
 241         }
 242         return -E_NO_MORE_SLOTS;
 243 }
 244
 245 static int decoder_running(int format)
 246 {
 247         int i, ret = 0;
 248         struct slot_info *s;
 249
 250         FOR_EACH_SLOT(i) {
 251                 s = &slot[i];
 252                 if (s->format == format && s->receiver_node)
 253                         ret |= 1;
 254                 if (s->format == format && s->wng)
 255                         ret |= 2;
 256         }
 257         return ret;
 258 }
 259
 260 static void close_stat_pipe(void)
 261 {
 262         int i;
 263
 264         if (stat_task->fd < 0)
 265                 return;
 266         PARA_NOTICE_LOG("%s", "closing status pipe\n");
 267         close(stat_task->fd);
 268         del_close_on_fork_list(stat_task->fd);
 269         stat_task->fd = -1;
 270 //      kill_all_decoders();
 271         for (i = 0; i < NUM_STAT_ITEMS; i++) {
 272                 free(stat_task->stat_item_values[i]);
 273                 stat_task->stat_item_values[i] = NULL;
 274         }
 275         dump_empty_status();
 276         stat_task->length_seconds = 0;
 277         stat_task->offset_seconds = 0;
 278         audiod_status_dump();
 279         stat_task->playing = 0;
 280         stat_task->stat_item_values[SI_STATUS_BAR] = make_message(
 281                 "%s:no connection to para_server\n",
 282                 status_item_list[SI_STATUS_BAR]);
 283         stat_client_write(stat_task->stat_item_values[SI_STATUS_BAR], SI_STATUS_BAR);
 284 }
 285
 286 void __noreturn clean_exit(int status, const char *msg)
 287 {
 288         PARA_EMERG_LOG("%s\n", msg);
 289         if (socket_name)
 290                 unlink(socket_name);
 291         close_stat_pipe();
 292         exit(status);
 293 }
 294
 295 /**
 296  * get the number of filters
 297  *
 298  * \param audio_format_num the number identifying the audio format
 299  *
 300  * \return the number of filters for the given audio format
 301  *
 302  * \sa struct filter;
 303  */
 304 int num_filters(int audio_format_num)
 305 {
 306         return afi[audio_format_num].num_filters;
 307 }
 308
 309 static void filter_event_handler(struct task *t)
 310 {
 311         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 312         struct filter_chain *fc = t->private_data;
 313         fc->eof = 1;
 314         unregister_task(t);
 315 }
 316
 317 static void open_filters(int slot_num)
 318 {
 319         struct slot_info *s = &slot[slot_num];
 320         struct audio_format_info *a = &afi[s->format];
 321         int nf = a->num_filters;
 322         int i;
 323
 324         s->fc = NULL;
 325         if (!nf)
 326                 return;
 327         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 328         s->fc = para_calloc(sizeof(struct filter_chain));
 329         INIT_LIST_HEAD(&s->fc->filters);
 330         s->fc->inbuf = s->receiver_node->buf;
 331         s->fc->in_loaded = &s->receiver_node->loaded;
 332         s->fc->input_eof = &s->receiver_node->eof;
 333         s->fc->task.pre_select = filter_pre_select;
 334         s->fc->task.event_handler = filter_event_handler;
 335         s->fc->task.private_data = s->fc;
 336         s->fc->eof = 0;
 337
 338         s->receiver_node->output_eof = &s->fc->eof;
 339         sprintf(s->fc->task.status, "filter chain");
 340         for (i = 0; i < nf; i++) {
 341                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 342                 fn->conf = a->filter_conf[i];
 343                 fn->fc = s->fc;
 344                 fn->filter = a->filters[i];
 345                 INIT_LIST_HEAD(&fn->callbacks);
 346                 list_add_tail(&fn->node, &s->fc->filters);
 347                 fn->filter->open(fn);
 348                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 349                         audio_formats[s->format], i + 1,  nf,
 350                         fn->filter->name, slot_num);
 351                 s->fc->outbuf = fn->buf;
 352                 s->fc->out_loaded = &fn->loaded;
 353         }
 354         register_task(&s->fc->task);
 355 }
 356
 357 static void wng_event_handler(struct task *t)
 358 {
 359         struct writer_node_group *wng = t->private_data;
 360
 361         PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
 362         wng->eof = 1;
 363         wng_unregister(wng);
 364 }
 365
 366 static void open_writers(int slot_num)
 367 {
 368         int ret, i;
 369         struct slot_info *s = &slot[slot_num];
 370         struct audio_format_info *a = &afi[s->format];
 371
 372         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 373         if (!a->num_writers)
 374                 s->wng = setup_default_wng();
 375         else
 376                 s->wng = wng_new(a->num_writers);
 377         if (s->fc) {
 378                 s->wng->buf = s->fc->outbuf;
 379                 s->wng->loaded = s->fc->out_loaded;
 380                 s->wng->input_eof = &s->fc->eof;
 381                 s->wng->channels = &s->fc->channels;
 382                 s->wng->samplerate = &s->fc->samplerate;
 383                 s->fc->output_eof = &s->wng->eof;
 384                 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
 385         } else {
 386                 s->wng->buf = s->receiver_node->buf;
 387                 s->wng->loaded = &s->receiver_node->loaded;
 388                 s->wng->input_eof = &s->receiver_node->eof;
 389         }
 390         s->wng->task.event_handler = wng_event_handler;
 391         for (i = 0; i < a->num_writers; i++) {
 392                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 393                 s->wng->writer_nodes[i].writer = a->writers[i];
 394         }
 395         ret = wng_open(s->wng);
 396         if (ret < 0) {
 397                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 398                 return;
 399         }
 400         s->wstime = *now;
 401         activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
 402 }
 403
 404 static void rn_event_handler(struct task *t)
 405 {
 406         struct receiver_node *rn = t->private_data;
 407
 408         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 409         unregister_task(t);
 410         rn->eof = 1;
 411 }
 412
 413 static void open_receiver(int format)
 414 {
 415         struct audio_format_info *a = &afi[format];
 416         struct slot_info *s;
 417         int ret, slot_num;
 418         struct receiver_node *rn;
 419
 420         slot_num = get_empty_slot();
 421         if (slot_num < 0)
 422                 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
 423         s = &slot[slot_num];
 424         s->format = format;
 425         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 426         rn = s->receiver_node;
 427         rn->receiver = a->receiver;
 428         rn->conf = a->receiver_conf;
 429         ret = a->receiver->open(s->receiver_node);
 430         if (ret < 0) {
 431                 PARA_ERROR_LOG("failed to open receiver (%s)\n",
 432                         PARA_STRERROR(-ret));
 433                 free(s->receiver_node);
 434                 s->receiver_node = NULL;
 435                 return;
 436         }
 437         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 438                 audio_formats[s->format], a->receiver->name, slot_num);
 439         rn->task.private_data = s->receiver_node;
 440         rn->task.pre_select = a->receiver->pre_select;
 441         rn->task.post_select = a->receiver->post_select;
 442         rn->task.event_handler = rn_event_handler;
 443         sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
 444         register_task(&rn->task);
 445 }
 446
 447 static int open_current_receiver(struct sched *s)
 448 {
 449         int i;
 450         struct timeval diff;
 451
 452         if (!stat_task->af_status)
 453                 return 0;
 454         i = get_audio_format_num(stat_task->af_status);
 455         if (i < 0)
 456                 return 0;
 457         if (decoder_running(i))
 458                 return 0;
 459         if (tv_diff(now, &afi[i].restart_barrier, &diff) < 0) {
 460                 s->timeout = diff;
 461                 return 0;
 462         }
 463         open_receiver(i);
 464         return 1;
 465 }
 466
 467 static void compute_time_diff(const struct timeval *status_time)
 468 {
 469         struct timeval tmp, diff;
 470         static int count;
 471         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 472         const struct timeval max_deviation = {0, 500 * 1000};
 473         const int time_smooth = 5;
 474
 475         sign = tv_diff(status_time, now, &diff);
 476 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 477 //                      sign, sa_time_diff_sign);
 478         if (!count) {
 479                 sa_time_diff_sign = sign;
 480                 stat_task->sa_time_diff = diff;
 481                 count++;
 482                 return;
 483         }
 484         if (count > 5) {
 485                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 486                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 487                         PARA_WARNING_LOG("time diff jump: %lims\n",
 488                                 s * tv2ms(&tmp));
 489         }
 490         count++;
 491         sa_time_diff_sign = tv_convex_combination(
 492                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 493                 count > 10? sign : sign * time_smooth, &diff,
 494                 &tmp);
 495         stat_task->sa_time_diff = tmp;
 496         PARA_DEBUG_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 497                 sign > 0? "+" : "-",
 498                 tv2ms(&diff),
 499                 sa_time_diff_sign ? "+" : "-",
 500                 tv2ms(&stat_task->sa_time_diff)
 501         );
 502 }
 503
 504 static void check_stat_line(char *line)
 505 {
 506         int itemnum;
 507         size_t ilen = 0;
 508         long unsigned sec, usec;
 509         char *tmp;
 510
 511 //      PARA_INFO_LOG("line: %s\n", line);
 512         if (!line)
 513                 return;
 514         itemnum = stat_line_valid(line);
 515         if (itemnum < 0) {
 516                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 517                 return;
 518         }
 519         tmp = make_message("%s\n", line);
 520         stat_client_write(tmp, itemnum);
 521         free(tmp);
 522         free(stat_task->stat_item_values[itemnum]);
 523         stat_task->stat_item_values[itemnum] = para_strdup(line);
 524         ilen = strlen(status_item_list[itemnum]);
 525         switch (itemnum) {
 526         case SI_STATUS:
 527                 stat_task->playing = strstr(line, "playing")? 1 : 0;
 528                 break;
 529         case SI_FORMAT:
 530                 free(stat_task->af_status);
 531                 stat_task->af_status = para_strdup(line + ilen + 1);
 532                 break;
 533         case SI_OFFSET:
 534                 stat_task->offset_seconds = atoi(line + ilen + 1);
 535                 break;
 536         case SI_LENGTH:
 537                 stat_task->length_seconds = atoi(line + ilen + 1);
 538                 break;
 539         case SI_STREAM_START:
 540                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 541                         stat_task->server_stream_start.tv_sec = sec;
 542                         stat_task->server_stream_start.tv_usec = usec;
 543                 }
 544                 break;
 545         case SI_CURRENT_TIME:
 546                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 547                         struct timeval tv = {sec, usec};
 548                         compute_time_diff(&tv);
 549                 }
 550                 break;
 551         }
 552 }
 553
 554 static void handle_signal(int sig)
 555 {
 556         switch (sig) {
 557         case SIGCHLD:
 558                 for (;;) {
 559                         pid_t pid = para_reap_child();
 560                         if (pid <= 0)
 561                                 return;
 562                         PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
 563                 }
 564         case SIGINT:
 565         case SIGTERM:
 566         case SIGHUP:
 567                 PARA_EMERG_LOG("terminating on signal %d\n", sig);
 568                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 569                 return;
 570         }
 571 }
 572
 573 static void try_to_close_slot(int slot_num)
 574 {
 575         struct slot_info *s = &slot[slot_num];
 576
 577         if (s->format < 0)
 578                 return;
 579         if (s->receiver_node && !s->receiver_node->eof)
 580                 return;
 581         if (s->fc && !s->fc->eof)
 582                 return;
 583         if (s->wng && !s->wng->eof)
 584                 return;
 585         PARA_INFO_LOG("closing slot %d \n", slot_num);
 586         wng_close(s->wng);
 587         close_filters(s->fc);
 588         free(s->fc);
 589         close_receiver(slot_num);
 590         clear_slot(slot_num);
 591 }
 592
 593 /*
 594  * Check if any receivers/filters/writers need to be started and do so if
 595  * neccessary.  Since the pre_select function didn't have a chance yet to put
 596  * file descriptors into the fd sets given by s, make the upcoming select()
 597  * return immediately to avoid a long timeout in case we started something.
 598  */
 599 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
 600 {
 601         int i;
 602         struct timeval min_delay = {0, 1};
 603
 604         t->ret = 1;
 605         if (audiod_status != AUDIOD_ON || !stat_task->playing)
 606                 return kill_all_decoders();
 607         if (open_current_receiver(s))
 608                 s->timeout = min_delay;
 609         FOR_EACH_SLOT(i) {
 610                 struct slot_info *sl = &slot[i];
 611                 struct audio_format_info *a;
 612
 613                 if (sl->format < 0)
 614                         continue;
 615                 a = &afi[sl->format];
 616                 if (!sl->receiver_node)
 617                         continue;
 618                 if (!a->num_filters) {
 619                         if (sl->receiver_node->loaded && !sl->wng) {
 620                                 open_writers(i);
 621                                 s->timeout = min_delay;
 622                         }
 623                         continue;
 624                 }
 625                 if (sl->receiver_node->loaded && !sl->fc) {
 626                         open_filters(i);
 627                         s->timeout = min_delay;
 628                         continue;
 629                 }
 630                 if (sl->fc && *sl->fc->out_loaded && !sl->wng) {
 631                         open_writers(i);
 632                         s->timeout = min_delay;
 633                 }
 634         }
 635 }
 636
 637 static void audiod_post_select(__a_unused struct sched *s,
 638         __a_unused struct task *t)
 639 {
 640         int i;
 641
 642         /* save away the current time for other users */
 643         t->ret = 1;
 644         FOR_EACH_SLOT(i)
 645                 try_to_close_slot(i);
 646 }
 647
 648 static void init_audiod_task(struct task *t)
 649 {
 650         t->pre_select = audiod_pre_select;
 651         t->post_select = audiod_post_select;
 652         t->event_handler = NULL;
 653         t->private_data = t;
 654         sprintf(t->status, "audiod task");
 655 }
 656
 657 static int parse_stream_command(const char *txt, char **cmd)
 658 {
 659         char *p = strchr(txt, ':');
 660         int i;
 661
 662         if (!p)
 663                 return -E_MISSING_COLON;
 664         p++;
 665         FOR_EACH_AUDIO_FORMAT(i) {
 666                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 667                         continue;
 668                 *cmd = p;
 669                 return i;
 670         }
 671         return -E_UNSUPPORTED_AUDIO_FORMAT;
 672 }
 673
 674 static int add_filter(int format, char *cmdline)
 675 {
 676         struct audio_format_info *a = &afi[format];
 677         int filter_num, nf = a->num_filters;
 678
 679         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 680         if (filter_num < 0)
 681                 return filter_num;
 682         a->filters[nf] = &filters[filter_num];
 683         a->num_filters++;
 684         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
 685                 a->filters[nf]->name);
 686         return filter_num;
 687 }
 688
 689 static int init_writers(void)
 690 {
 691         int i, ret, nw;
 692         char *cmd;
 693         struct audio_format_info *a;
 694
 695         init_supported_writers();
 696         nw = PARA_MAX(1, conf.writer_given);
 697         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 698         FOR_EACH_AUDIO_FORMAT(i) {
 699                 a = &afi[i];
 700                 a->writer_conf = para_malloc(nw * sizeof(void *));
 701                 a->writers = para_malloc(nw * sizeof(struct writer *));
 702                 a->num_writers = 0;
 703         }
 704         for (i = 0; i < conf.writer_given; i++) {
 705                 void *wconf;
 706                 int writer_num;
 707                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 708                 if (ret < 0)
 709                         goto out;
 710                 a = &afi[ret];
 711                 nw = a->num_writers;
 712                 wconf = check_writer_arg(cmd, &writer_num);
 713                 if (!wconf) {
 714                         ret = writer_num;
 715                         goto out;
 716                 }
 717                 a->writers[nw] = &writers[writer_num];
 718                 a->writer_conf[nw] = wconf;
 719                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 720                         nw, writer_names[writer_num]);
 721                 a->num_writers++;
 722         }
 723         ret = 1;
 724 out:
 725         return ret;
 726 }
 727
 728 static int init_receivers(void)
 729 {
 730         int i, ret, receiver_num;
 731         char *cmd = NULL;
 732         struct audio_format_info *a;
 733
 734         for (i = 0; receivers[i].name; i++) {
 735                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
 736                 receivers[i].init(&receivers[i]);
 737         }
 738         for (i = 0; i < conf.receiver_given; i++) {
 739                 char *arg = conf.receiver_arg[i];
 740                 char *recv = strchr(arg, ':');
 741                 ret = -E_MISSING_COLON;
 742                 if (!recv)
 743                         goto out;
 744                 *recv = '\0';
 745                 recv++;
 746                 ret = get_audio_format_num(arg);
 747                 if (ret < 0)
 748                         goto out;
 749                 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
 750                 if (!afi[ret].receiver_conf) {
 751                         ret = -E_RECV_SYNTAX;
 752                         goto out;
 753                 }
 754                 afi[ret].receiver = &receivers[receiver_num];
 755         }
 756         /* use the first available receiver with no arguments
 757          * for those audio formats for which no receiver
 758          * was specified
 759          */
 760         cmd = para_strdup(receivers[0].name);
 761         FOR_EACH_AUDIO_FORMAT(i) {
 762                 a = &afi[i];
 763                 if (a->receiver_conf)
 764                         continue;
 765                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 766                 if (!a->receiver_conf)
 767                         return -E_RECV_SYNTAX;
 768                 a->receiver = &receivers[receiver_num];
 769         }
 770         ret = 1;
 771 out:
 772         free(cmd);
 773         return ret;
 774 }
 775
 776 static int init_default_filters(void)
 777 {
 778         int i, ret = 1;
 779
 780         FOR_EACH_AUDIO_FORMAT(i) {
 781                 struct audio_format_info *a = &afi[i];
 782                 char *tmp;
 783                 int j;
 784
 785                 if (a->num_filters)
 786                         continue; /* no default -- nothing to to */
 787                 /* add "dec" to audio format name */
 788                 tmp = make_message("%sdec", audio_formats[i]);
 789                 for (j = 0; filters[j].name; j++)
 790                         if (!strcmp(tmp, filters[j].name))
 791                                 break;
 792                 free(tmp);
 793                 ret = -E_UNSUPPORTED_FILTER;
 794                 if (!filters[j].name)
 795                         goto out;
 796                 tmp = para_strdup(filters[j].name);
 797                 ret = add_filter(i, tmp);
 798                 free(tmp);
 799                 if (ret < 0)
 800                         goto out;
 801                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 802                         filters[j].name);
 803         }
 804 out:
 805         return ret;
 806 }
 807
 808 static int init_filters(void)
 809 {
 810         int i, ret, nf;
 811
 812         filter_init(filters);
 813         nf = PARA_MAX(1,  conf.filter_given);
 814         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 815         FOR_EACH_AUDIO_FORMAT(i) {
 816                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 817                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
 818         }
 819         if (!conf.no_default_filters_given)
 820                 return init_default_filters();
 821         for (i = 0; i < conf.filter_given; i++) {
 822                 char *arg = conf.filter_arg[i];
 823                 char *filter_name = strchr(arg, ':');
 824                 ret = -E_MISSING_COLON;
 825                 if (!filter_name)
 826                         goto out;
 827                 *filter_name = '\0';
 828                 filter_name++;
 829                 ret = get_audio_format_num(arg);
 830                 if (ret < 0)
 831                         goto out;
 832                 ret = add_filter(ret, filter_name);
 833                 if (ret < 0)
 834                         goto out;
 835         }
 836         ret = init_default_filters(); /* use default values for the rest */
 837 out:
 838         return ret;
 839 }
 840
 841 static int init_stream_io(void)
 842 {
 843         int ret;
 844
 845         ret = init_writers();
 846         if (ret < 0)
 847                 return ret;
 848         ret = init_receivers();
 849         if (ret < 0)
 850                 return ret;
 851         ret = init_filters();
 852         if (ret < 0)
 853                 return ret;
 854         return 1;
 855 }
 856
 857 static int audiod_get_socket(void)
 858 {
 859         struct sockaddr_un unix_addr;
 860         int fd;
 861
 862         if (conf.socket_given)
 863                 socket_name = para_strdup(conf.socket_arg);
 864         else {
 865                 char *hn = para_hostname();
 866                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 867                         hn);
 868                 free(hn);
 869         }
 870         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 871         if (conf.force_given)
 872                 unlink(socket_name);
 873         fd = create_pf_socket(socket_name, &unix_addr,
 874                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 875         if (fd < 0) {
 876                 PARA_EMERG_LOG("%s", "can not connect to socket\n");
 877                 exit(EXIT_FAILURE); /* do not unlink socket */
 878         }
 879         if (listen(fd , 5) < 0) {
 880                 PARA_EMERG_LOG("%s", "can not listen on socket\n");
 881                 exit(EXIT_FAILURE); /* do not unlink socket */
 882         }
 883         add_close_on_fork_list(fd);
 884         mark_fd_nonblock(fd);
 885         return fd;
 886 }
 887
 888 static int open_stat_pipe(void)
 889 {
 890         int ret, fd[3] = {-1, 1, 0};
 891         pid_t pid;
 892         ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
 893         if (ret >= 0) {
 894                 ret = fd[1];
 895                 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
 896                 add_close_on_fork_list(ret);
 897                 mark_fd_nonblock(ret);
 898         } else
 899                 clean_exit(EXIT_FAILURE, "failed to open status pipe");
 900         return ret;
 901 }
 902
 903 void signal_event_handler(struct task *t)
 904 {
 905         struct signal_task *st = t->private_data;
 906
 907         if (t->ret != -E_SIGNAL_CAUGHT)
 908                 PARA_ERROR_LOG("%s (ignored)\n", PARA_STRERROR(-t->ret));
 909         else
 910                 handle_signal(st->signum);
 911 }
 912
 913 void signal_pre_select(struct sched *s, struct task *t)
 914 {
 915         struct signal_task *st = t->private_data;
 916         t->ret = 1;
 917         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 918 }
 919
 920 void signal_post_select(struct sched *s, struct task *t)
 921 {
 922         struct signal_task *st = t->private_data;
 923         t->ret = 1;
 924         if (!FD_ISSET(st->fd, &s->rfds))
 925                 return;
 926         t->ret = -E_SIGNAL_CAUGHT;
 927         st->signum = para_next_signal();
 928 }
 929
 930 void signal_setup_default(struct signal_task *st)
 931 {
 932         st->task.pre_select = signal_pre_select;
 933         st->task.post_select = signal_post_select;
 934         st->task.private_data = st;
 935         sprintf(st->task.status, "signal task");
 936 }
 937
 938 static void command_pre_select(struct sched *s, struct task *t)
 939 {
 940         struct command_task *ct = t->private_data;
 941         t->ret = 1;
 942         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 943
 944 }
 945
 946 static void command_post_select(struct sched *s, struct task *t)
 947 {
 948         int ret;
 949         struct command_task *ct = t->private_data;
 950
 951         t->ret = 1; /* always successful */
 952         if (audiod_status != AUDIOD_OFF)
 953                 audiod_status_dump();
 954         if (!FD_ISSET(ct->fd, &s->rfds))
 955                 return;
 956         ret = handle_connect(ct->fd);
 957         if (ret < 0)
 958                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 959 }
 960
 961 static void init_command_task(struct command_task *ct)
 962 {
 963         ct->task.pre_select = command_pre_select;
 964         ct->task.post_select = command_post_select;
 965         ct->task.event_handler = NULL;
 966         ct->task.private_data = ct;
 967         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 968         sprintf(ct->task.status, "command task");
 969 }
 970
 971 static void status_event_handler(__a_unused struct task *t)
 972 {
 973         struct timeval delay = {1, 0};
 974         int i;
 975         struct status_task *st = t->private_data;
 976
 977         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-t->ret));
 978         close_stat_pipe();
 979         /* avoid busy loop if server is down */
 980         tv_add(now, &delay, &st->restart_barrier);
 981         FOR_EACH_AUDIO_FORMAT(i)
 982                 afi[i].restart_barrier = st->restart_barrier;
 983 }
 984
 985 static void status_pre_select(struct sched *s, struct task *t)
 986 {
 987         struct status_task *st = t->private_data;
 988         t->ret = 1;
 989         if (st->fd >= 0 && audiod_status == AUDIOD_OFF)
 990                 close_stat_pipe();
 991         if (st->fd < 0 && audiod_status != AUDIOD_OFF
 992                 && tv_diff(now, &st->restart_barrier, NULL) > 0) {
 993                 st->fd = open_stat_pipe();
 994                 st->loaded = 0;
 995                 st->buf[0] = '\0';
 996         }
 997         if (st->fd >= 0 && audiod_status != AUDIOD_OFF)
 998                 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 999 }
1000
1001 static void status_post_select(struct sched *s, struct task *t)
1002 {
1003         struct status_task *st = t->private_data;
1004
1005         t->ret = 1;
1006         if (st->fd < 0 || !FD_ISSET(st->fd, &s->rfds))
1007                 return;
1008         t->ret = read(st->fd, st->buf + st->loaded, STRINGSIZE - 1 - st->loaded);
1009         if (t->ret <= 0) {
1010                 if (!t->ret)
1011                         t->ret = -E_STATUS_EOF;
1012                 return;
1013         }
1014         st->buf[t->ret + st->loaded] = '\0';
1015         st->loaded = for_each_line(st->buf, t->ret + st->loaded,
1016                 &check_stat_line);
1017 }
1018
1019 static void init_status_task(struct status_task *st)
1020 {
1021         memset(st, 0, sizeof(struct status_task));
1022         st->task.pre_select = status_pre_select;
1023         st->task.post_select = status_post_select;
1024         st->task.event_handler = status_event_handler;
1025         st->task.private_data = st;
1026         st->fd = -1;
1027         st->sa_time_diff_sign = 1;
1028         sprintf(st->task.status, "status task");
1029 }
1030
1031 static void set_initial_status(void)
1032 {
1033         audiod_status = AUDIOD_ON;
1034         if (!conf.mode_given)
1035                 return;
1036         if (!strcmp(conf.mode_arg, "sb")) {
1037                 audiod_status = AUDIOD_STANDBY;
1038                 return;
1039         }
1040         if (!strcmp(conf.mode_arg, "off")) {
1041                 audiod_status = AUDIOD_OFF;
1042                 return;
1043         }
1044         if (strcmp(conf.mode_arg, "on"))
1045                 PARA_WARNING_LOG("%s", "invalid mode\n");
1046 }
1047
1048 int main(int argc, char *argv[])
1049 {
1050         char *cf;
1051         int ret, i;
1052         struct sched s;
1053         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1054         struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1055
1056         valid_fd_012();
1057         cmdline_parser(argc, argv, &conf);
1058         para_drop_privileges(conf.user_arg, conf.group_arg);
1059         cf = configfile_exists();
1060         if (cf) {
1061                 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1062                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1063                         exit(EXIT_FAILURE);
1064                 }
1065         }
1066         if (conf.logfile_given)
1067                 logfile = open_log(conf.logfile_arg);
1068         log_welcome("para_audiod", conf.loglevel_arg);
1069         i = init_stream_io();
1070         if (i < 0) {
1071                 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1072                 exit(EXIT_FAILURE);
1073         }
1074         server_uptime(UPTIME_SET);
1075         set_initial_status();
1076         FOR_EACH_SLOT(i)
1077                 clear_slot(i);
1078         init_grabbing();
1079         setup_signal_handling();
1080         signal_setup_default(sig_task);
1081         sig_task->task.event_handler = signal_event_handler;
1082
1083         init_status_task(stat_task);
1084         init_command_task(cmd_task);
1085         init_audiod_task(audiod_task);
1086
1087         if (conf.daemon_given)
1088                 daemon_init();
1089
1090         register_task(&sig_task->task);
1091         register_task(&cmd_task->task);
1092         register_task(&stat_task->task);
1093         register_task(audiod_task);
1094         s.default_timeout.tv_sec = 3;
1095         s.default_timeout.tv_usec = 99 * 1000;
1096         ret = sched(&s);
1097
1098         PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1099         return EXIT_FAILURE;
1100 }