audiod.c

   1 /*
   2  * Copyright (C) 2005-2007 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file audiod.c the paraslash's audio daemon */
   8
   9 #include "para.h"
  10
  11 #include "audiod.cmdline.h"
  12 #include "list.h"
  13 #include "sched.h"
  14 #include "recv.h"
  15 #include "filter.h"
  16 #include "grab_client.cmdline.h"
  17 #include "grab_client.h"
  18 #include "client.cmdline.h"
  19 #include "client.h"
  20 #include "audiod.h"
  21 #include "net.h"
  22 #include "daemon.h"
  23 #include "string.h"
  24 #include "fd.h"
  25 #include "write.h"
  26 #include "write_common.h"
  27 #include "error.h"
  28 #include "signal.h"
  29
  30 /** define the array of error lists needed by para_audiod */
  31 INIT_AUDIOD_ERRLISTS;
  32 /** define the array containing all supported audio formats */
  33 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
  34
  35 /** defines how to handle one supported audio format */
  36 struct audio_format_info {
  37         /** pointer to the receiver for this audio format */
  38         struct receiver *receiver;
  39         /** the receiver configuration */
  40         void *receiver_conf;
  41         /** the number of filters that should be activated for this audio format */
  42         unsigned int num_filters;
  43         /** pointer to the array of filters to be activated */
  44         struct filter **filters;
  45         /** pointer to the array of filter configurations */
  46         void **filter_conf;
  47         /** the number of filters that should be activated for this audio format */
  48         unsigned int num_writers;
  49         /** pointer to the array of writers to be activated */
  50         struct writer **writers;
  51         /** pointer to the array of writer configurations */
  52         void **writer_conf;
  53         /** do not start receiver/filters/writer before this time */
  54         struct timeval restart_barrier;
  55 };
  56
  57 /**
  58  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  59  * be associated with a receiver/filter/writer triple. This array holds all
  60  * information on the status of these slots.
  61  *
  62  * \sa struct slot_info
  63  * */
  64 struct slot_info slot[MAX_STREAM_SLOTS];
  65
  66
  67 /**
  68  * the current mode of operation of which can be changed by the on/off/cycle
  69  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
  70  */
  71 int audiod_status = AUDIOD_ON;
  72
  73 /**
  74  * the gengetopt args_info struct that holds information on all command line
  75  * arguments
  76  */
  77 struct audiod_args_info conf;
  78
  79 static char *socket_name;
  80 static FILE *logfile;
  81 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
  82
  83 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
  84
  85 static struct status_task status_task_struct;
  86
  87 /**
  88  * the task that calls the status command of para_server
  89  *
  90  * \sa struct status_task
  91  */
  92 struct status_task *stat_task = &status_task_struct;
  93 static struct timeval initial_delay_barrier;
  94
  95 /**
  96  * the task for handling audiod commands
  97  *
  98  * \sa struct task, struct sched
  99  */
 100 struct command_task {
 101         /** the local listening socket */
 102         int fd;
 103         /** the associated task structure */
 104         struct task task;
 105 };
 106
 107 /**
 108  * task for signal handling
 109  */
 110 struct signal_task {
 111         /** the signal pipe */
 112         int fd;
 113         /** the number of the most recent signal */
 114         int signum;
 115         /** the associated task structure */
 116         struct task task;
 117 };
 118
 119 /** iterate over all supported audio formats */
 120 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 121
 122 /**
 123  * get the audio format number
 124  * \param name the name of the audio format
 125  *
 126  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 127  * \a name is not a supported audio format.
 128  */
 129 int get_audio_format_num(char *name)
 130 {
 131         int i;
 132         FOR_EACH_AUDIO_FORMAT(i)
 133                 if (!strcmp(name, audio_formats[i]))
 134                         return i;
 135         return -E_UNSUPPORTED_AUDIO_FORMAT;
 136 }
 137
 138 /**
 139  * the log function of para_audiod
 140  *
 141  * \param ll loglevel
 142  * \param fmt the format string
 143  */
 144 void para_log(int ll, const char* fmt,...)
 145 {
 146         va_list argp;
 147         FILE *outfd;
 148         struct tm *tm;
 149         time_t t1;
 150         char str[MAXLINE] = "";
 151         static char *hostname;
 152
 153         if (ll < conf.loglevel_arg)
 154                 return;
 155         if (!hostname)
 156                 hostname = para_hostname();
 157         outfd = logfile? logfile : stderr;
 158         time(&t1);
 159         tm = localtime(&t1);
 160         strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
 161         fprintf(outfd, "%s %s ", str, hostname);
 162         if (conf.loglevel_arg <= INFO)
 163                 fprintf(outfd, "%i ", ll);
 164         va_start(argp, fmt);
 165         vfprintf(outfd, fmt, argp);
 166         va_end(argp);
 167 }
 168
 169 static char *configfile_exists(void)
 170 {
 171         char *home = para_homedir();
 172         char *config_file = make_message("%s/.paraslash/audiod.conf",
 173                 home);
 174         free(home);
 175         if (file_exists(config_file))
 176                 return config_file;
 177         free(config_file);
 178         return NULL;
 179 }
 180
 181 static void setup_signal_handling(void)
 182 {
 183         sig_task->fd = para_signal_init();
 184         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 185         para_install_sighandler(SIGINT);
 186         para_install_sighandler(SIGTERM);
 187         para_install_sighandler(SIGHUP);
 188         signal(SIGPIPE, SIG_IGN);
 189 }
 190
 191 static void clear_slot(int slot_num)
 192 {
 193         struct slot_info *s = &slot[slot_num];
 194
 195         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 196         memset(s, 0, sizeof(struct slot_info));
 197         s->format = -1;
 198 }
 199
 200 static void close_receiver(int slot_num)
 201 {
 202         struct slot_info *s = &slot[slot_num];
 203         struct audio_format_info *a;
 204
 205         if (s->format < 0 || !s->receiver_node)
 206                 return;
 207         a = &afi[s->format];
 208         PARA_NOTICE_LOG("closing %s receiver in slot %d (eof = %d)\n",
 209                 audio_formats[s->format] , slot_num, s->receiver_node->eof);
 210         a->receiver->close(s->receiver_node);
 211         free(s->receiver_node);
 212         s->receiver_node = NULL;
 213 }
 214
 215 static void kill_all_decoders(void)
 216 {
 217         int i;
 218
 219         FOR_EACH_SLOT(i) {
 220                 struct slot_info *s = &slot[i];
 221                 if (s->wng && !s->wng->eof) {
 222                         PARA_INFO_LOG("unregistering writer node group in slot %d\n",
 223                                 i);
 224                         wng_unregister(s->wng);
 225                         s->wng->eof = 1;
 226                 }
 227                 if (s->fc && !s->fc->eof) {
 228                         PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
 229                         unregister_task(&s->fc->task);
 230                         s->fc->eof = 1;
 231                 }
 232                 if (s->receiver_node && !s->receiver_node->eof) {
 233                         PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
 234                         unregister_task(&s->receiver_node->task);
 235                         s->receiver_node->eof = 1;
 236                 }
 237         }
 238 }
 239
 240 static int get_empty_slot(void)
 241 {
 242         int i;
 243         struct slot_info *s;
 244
 245         FOR_EACH_SLOT(i) {
 246                 s = &slot[i];
 247                 if (s->format < 0) {
 248                         clear_slot(i);
 249                         return i;
 250                 }
 251                 if (s->wng || s->receiver_node || s->fc)
 252                         continue;
 253                 clear_slot(i);
 254                 return i;
 255         }
 256         return -E_NO_MORE_SLOTS;
 257 }
 258
 259 /**
 260  * get the number of filters
 261  *
 262  * \param audio_format_num the number identifying the audio format
 263  *
 264  * \return the number of filters for the given audio format
 265  *
 266  * \sa struct filter;
 267  */
 268 int num_filters(int audio_format_num)
 269 {
 270         return afi[audio_format_num].num_filters;
 271 }
 272
 273 static void filter_event_handler(struct task *t)
 274 {
 275         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 276         struct filter_chain *fc = t->private_data;
 277         fc->eof = 1;
 278         unregister_task(t);
 279 }
 280
 281 static void open_filters(int slot_num)
 282 {
 283         struct slot_info *s = &slot[slot_num];
 284         struct audio_format_info *a = &afi[s->format];
 285         int nf = a->num_filters;
 286         int i;
 287
 288         s->fc = NULL;
 289         if (!nf)
 290                 return;
 291         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 292         s->fc = para_calloc(sizeof(struct filter_chain));
 293         INIT_LIST_HEAD(&s->fc->filters);
 294         s->fc->inbuf = s->receiver_node->buf;
 295         s->fc->in_loaded = &s->receiver_node->loaded;
 296         s->fc->input_eof = &s->receiver_node->eof;
 297         s->fc->task.pre_select = filter_pre_select;
 298         s->fc->task.event_handler = filter_event_handler;
 299         s->fc->task.private_data = s->fc;
 300         s->fc->eof = 0;
 301
 302         s->receiver_node->output_eof = &s->fc->eof;
 303         sprintf(s->fc->task.status, "filter chain");
 304         for (i = 0; i < nf; i++) {
 305                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 306                 fn->conf = a->filter_conf[i];
 307                 fn->fc = s->fc;
 308                 fn->filter = a->filters[i];
 309                 INIT_LIST_HEAD(&fn->callbacks);
 310                 list_add_tail(&fn->node, &s->fc->filters);
 311                 fn->filter->open(fn);
 312                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 313                         audio_formats[s->format], i + 1,  nf,
 314                         fn->filter->name, slot_num);
 315                 s->fc->outbuf = fn->buf;
 316                 s->fc->out_loaded = &fn->loaded;
 317         }
 318         register_task(&s->fc->task);
 319 }
 320
 321 static void wng_event_handler(struct task *t)
 322 {
 323         struct writer_node_group *wng = t->private_data;
 324
 325         PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
 326         wng->eof = 1;
 327         wng_unregister(wng);
 328 }
 329
 330 static void open_writers(int slot_num)
 331 {
 332         int ret, i;
 333         struct slot_info *s = &slot[slot_num];
 334         struct audio_format_info *a = &afi[s->format];
 335
 336         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 337         if (!a->num_writers)
 338                 s->wng = setup_default_wng();
 339         else
 340                 s->wng = wng_new(a->num_writers);
 341         if (s->fc) {
 342                 s->wng->buf = s->fc->outbuf;
 343                 s->wng->loaded = s->fc->out_loaded;
 344                 s->wng->input_eof = &s->fc->eof;
 345                 s->wng->channels = &s->fc->channels;
 346                 s->wng->samplerate = &s->fc->samplerate;
 347                 s->fc->output_eof = &s->wng->eof;
 348                 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
 349         } else {
 350                 s->wng->buf = s->receiver_node->buf;
 351                 s->wng->loaded = &s->receiver_node->loaded;
 352                 s->wng->input_eof = &s->receiver_node->eof;
 353         }
 354         s->wng->task.event_handler = wng_event_handler;
 355         for (i = 0; i < a->num_writers; i++) {
 356                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 357                 s->wng->writer_nodes[i].writer = a->writers[i];
 358         }
 359         ret = wng_open(s->wng);
 360         if (ret < 0) {
 361                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 362                 return;
 363         }
 364         s->wstime = *now;
 365         activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
 366 }
 367
 368 static void rn_event_handler(struct task *t)
 369 {
 370         struct receiver_node *rn = t->private_data;
 371         const struct timeval restart_delay = {0, 10 * 1000};
 372         int i;
 373
 374         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 375         unregister_task(t);
 376         rn->eof = 1;
 377         /* set restart barrier */
 378         FOR_EACH_SLOT(i) {
 379                 if (slot[i].receiver_node != rn)
 380                         continue;
 381                 tv_add(now, &restart_delay, &afi[slot[i].format].restart_barrier);
 382         }
 383 }
 384
 385 static int open_receiver(int format)
 386 {
 387         struct audio_format_info *a = &afi[format];
 388         struct slot_info *s;
 389         int ret, slot_num;
 390         struct receiver_node *rn;
 391         const struct timeval restart_delay = {1, 0};
 392
 393         ret = get_empty_slot();
 394         if (ret < 0)
 395                 goto err;
 396         slot_num = ret;
 397         s = &slot[slot_num];
 398         s->format = format;
 399         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 400         rn = s->receiver_node;
 401         rn->receiver = a->receiver;
 402         rn->conf = a->receiver_conf;
 403         ret = a->receiver->open(s->receiver_node);
 404         if (ret < 0) {
 405                 free(s->receiver_node);
 406                 s->receiver_node = NULL;
 407                 goto err;
 408         }
 409         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 410                 audio_formats[s->format], a->receiver->name, slot_num);
 411         rn->task.private_data = s->receiver_node;
 412         rn->task.pre_select = a->receiver->pre_select;
 413         rn->task.post_select = a->receiver->post_select;
 414         rn->task.event_handler = rn_event_handler;
 415         sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
 416         register_task(&rn->task);
 417         return 1;
 418 err:
 419         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 420         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 421         return ret;
 422 }
 423
 424 static int receiver_running(int format)
 425 {
 426         int i;
 427
 428         FOR_EACH_SLOT(i) {
 429                 struct slot_info *s = &slot[i];
 430                 if (s->format == format && s->receiver_node
 431                                 && !s->receiver_node->eof)
 432                         return 1;
 433         }
 434         return 0;
 435 }
 436
 437 static int open_current_receiver(struct sched *s)
 438 {
 439         int i;
 440         struct timeval diff;
 441         char *audio_format = stat_task->stat_item_values[SI_FORMAT];
 442
 443         if (!audio_format || !stat_task->pcd)
 444                 return 0;
 445         i = get_audio_format_num(audio_format + strlen(
 446                 status_item_list[SI_FORMAT]) + 1);
 447         if (i < 0)
 448                 return 0;
 449         if (receiver_running(i))
 450                 return 0;
 451         if (tv_diff(now, &afi[i].restart_barrier, &diff) < 0) {
 452                 s->timeout = diff;
 453                 return 0;
 454         }
 455         return open_receiver(i) < 0? 0 : 1;
 456 }
 457
 458 static unsigned compute_time_diff(const struct timeval *status_time)
 459 {
 460         struct timeval tmp, diff;
 461         static unsigned count;
 462         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 463         const struct timeval max_deviation = {0, 500 * 1000};
 464         const int time_smooth = 5;
 465
 466         if (!status_time)
 467                 return count;
 468         sign = tv_diff(status_time, now, &diff);
 469 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 470 //                      sign, sa_time_diff_sign);
 471         if (!count) {
 472                 sa_time_diff_sign = sign;
 473                 stat_task->sa_time_diff = diff;
 474                 count++;
 475                 goto out;
 476         }
 477         if (count > 5) {
 478                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 479                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 480                         PARA_WARNING_LOG("time diff jump: %lims\n",
 481                                 s * tv2ms(&tmp));
 482         }
 483         count++;
 484         sa_time_diff_sign = tv_convex_combination(
 485                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 486                 count > 10? sign : sign * time_smooth, &diff,
 487                 &tmp);
 488         stat_task->sa_time_diff = tmp;
 489         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 490                 sign > 0? "+" : "-",
 491                 tv2ms(&diff),
 492                 sa_time_diff_sign ? "+" : "-",
 493                 tv2ms(&stat_task->sa_time_diff)
 494         );
 495 out:
 496         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 497         return count;
 498 }
 499
 500 static int check_stat_line(char *line, __a_unused void *data)
 501 {
 502         int itemnum;
 503         size_t ilen = 0;
 504         long unsigned sec, usec;
 505         char *tmp;
 506
 507 //      PARA_INFO_LOG("line: %s\n", line);
 508         if (!line)
 509                 return 1;
 510         itemnum = stat_line_valid(line);
 511         if (itemnum < 0) {
 512                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 513                 return 1;
 514         }
 515         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 516                 return 1;
 517         tmp = make_message("%s\n", line);
 518         stat_client_write(tmp, itemnum);
 519         free(tmp);
 520         free(stat_task->stat_item_values[itemnum]);
 521         stat_task->stat_item_values[itemnum] = para_strdup(line);
 522         ilen = strlen(status_item_list[itemnum]);
 523         switch (itemnum) {
 524         case SI_STATUS:
 525                 stat_task->playing = strstr(line, "playing")? 1 : 0;
 526                 break;
 527         case SI_OFFSET:
 528                 stat_task->offset_seconds = atoi(line + ilen + 1);
 529                 break;
 530         case SI_LENGTH:
 531                 stat_task->length_seconds = atoi(line + ilen + 1);
 532                 break;
 533         case SI_STREAM_START:
 534                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 535                         struct timeval a_start, delay;
 536                         delay.tv_sec = conf.stream_delay_arg / 1000;
 537                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 538                         stat_task->server_stream_start.tv_sec = sec;
 539                         stat_task->server_stream_start.tv_usec = usec;
 540                         if (compute_time_diff(NULL) > 2) {
 541                                 if (stat_task->sa_time_diff_sign < 0)
 542                                         tv_add(&stat_task->server_stream_start,
 543                                                 &stat_task->sa_time_diff, &a_start);
 544                                 else
 545                                         tv_diff(&stat_task->server_stream_start,
 546                                                 &stat_task->sa_time_diff, &a_start);
 547                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 548                         }
 549                 }
 550                 break;
 551         case SI_CURRENT_TIME:
 552                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 553                         struct timeval tv = {sec, usec};
 554                         compute_time_diff(&tv);
 555                 }
 556                 if (stat_task->clock_diff_count)
 557                         stat_task->clock_diff_count--;
 558                 break;
 559         }
 560         return 1;
 561 }
 562
 563 static void try_to_close_slot(int slot_num)
 564 {
 565         struct slot_info *s = &slot[slot_num];
 566
 567         if (s->format < 0)
 568                 return;
 569         if (s->receiver_node && !s->receiver_node->eof)
 570                 return;
 571         if (s->fc && !s->fc->eof)
 572                 return;
 573         if (s->wng && !s->wng->eof)
 574                 return;
 575         PARA_INFO_LOG("closing slot %d \n", slot_num);
 576         wng_close(s->wng);
 577         close_filters(s->fc);
 578         free(s->fc);
 579         close_receiver(slot_num);
 580         clear_slot(slot_num);
 581 }
 582
 583 /*
 584  * Check if any receivers/filters/writers need to be started and do so if
 585  * neccessary.  Since the pre_select function didn't have a chance yet to put
 586  * file descriptors into the fd sets given by s, make the upcoming select()
 587  * return immediately to avoid a long timeout in case we started something.
 588  */
 589 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
 590 {
 591         int i;
 592         struct timeval min_delay = {0, 1};
 593
 594         t->ret = 1;
 595         if (audiod_status != AUDIOD_ON || !stat_task->playing)
 596                 return kill_all_decoders();
 597         if (open_current_receiver(s))
 598                 s->timeout = min_delay;
 599         FOR_EACH_SLOT(i) {
 600                 struct slot_info *sl = &slot[i];
 601                 struct audio_format_info *a;
 602                 struct timeval diff;
 603
 604                 if (sl->format < 0)
 605                         continue;
 606                 a = &afi[sl->format];
 607                 if (!sl->receiver_node)
 608                         continue;
 609                 if (!a->num_filters) {
 610                         if (sl->receiver_node->loaded && !sl->wng) {
 611                                 open_writers(i);
 612                                 s->timeout = min_delay;
 613                         }
 614                         continue;
 615                 }
 616                 if (sl->receiver_node->loaded && !sl->fc) {
 617                         open_filters(i);
 618                         s->timeout = min_delay;
 619                         continue;
 620                 }
 621                 if (!sl->fc || !*sl->fc->out_loaded || sl->wng)
 622                         continue;
 623                 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
 624                         open_writers(i);
 625                         s->timeout = min_delay;
 626                         continue;
 627                 }
 628                 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
 629                 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
 630                         s->timeout = diff;
 631                 }
 632         }
 633 }
 634
 635 static void audiod_post_select(__a_unused struct sched *s,
 636         __a_unused struct task *t)
 637 {
 638         int i;
 639
 640         t->ret = 1;
 641         FOR_EACH_SLOT(i)
 642                 try_to_close_slot(i);
 643 }
 644
 645 static void init_audiod_task(struct task *t)
 646 {
 647         t->pre_select = audiod_pre_select;
 648         t->post_select = audiod_post_select;
 649         t->event_handler = NULL;
 650         t->private_data = t;
 651         sprintf(t->status, "audiod task");
 652 }
 653
 654 static int parse_stream_command(const char *txt, char **cmd)
 655 {
 656         char *p = strchr(txt, ':');
 657         int i;
 658
 659         if (!p)
 660                 return -E_MISSING_COLON;
 661         p++;
 662         FOR_EACH_AUDIO_FORMAT(i) {
 663                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 664                         continue;
 665                 *cmd = p;
 666                 return i;
 667         }
 668         return -E_UNSUPPORTED_AUDIO_FORMAT;
 669 }
 670
 671 static int add_filter(int format, char *cmdline)
 672 {
 673         struct audio_format_info *a = &afi[format];
 674         int filter_num, nf = a->num_filters;
 675
 676         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 677         if (filter_num < 0)
 678                 return filter_num;
 679         a->filters[nf] = &filters[filter_num];
 680         a->num_filters++;
 681         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
 682                 a->filters[nf]->name);
 683         return filter_num;
 684 }
 685
 686 static int init_writers(void)
 687 {
 688         int i, ret, nw;
 689         char *cmd;
 690         struct audio_format_info *a;
 691
 692         init_supported_writers();
 693         nw = PARA_MAX(1, conf.writer_given);
 694         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 695         FOR_EACH_AUDIO_FORMAT(i) {
 696                 a = &afi[i];
 697                 a->writer_conf = para_malloc(nw * sizeof(void *));
 698                 a->writers = para_malloc(nw * sizeof(struct writer *));
 699                 a->num_writers = 0;
 700         }
 701         for (i = 0; i < conf.writer_given; i++) {
 702                 void *wconf;
 703                 int writer_num;
 704                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 705                 if (ret < 0)
 706                         goto out;
 707                 a = &afi[ret];
 708                 nw = a->num_writers;
 709                 wconf = check_writer_arg(cmd, &writer_num);
 710                 if (!wconf) {
 711                         ret = writer_num;
 712                         goto out;
 713                 }
 714                 a->writers[nw] = &writers[writer_num];
 715                 a->writer_conf[nw] = wconf;
 716                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 717                         nw, writer_names[writer_num]);
 718                 a->num_writers++;
 719         }
 720         ret = 1;
 721 out:
 722         return ret;
 723 }
 724
 725 static int init_receivers(void)
 726 {
 727         int i, ret, receiver_num;
 728         char *cmd = NULL;
 729         struct audio_format_info *a;
 730
 731         for (i = 0; receivers[i].name; i++) {
 732                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
 733                 receivers[i].init(&receivers[i]);
 734         }
 735         for (i = conf.receiver_given - 1; i >= 0; i--) {
 736                 char *arg = conf.receiver_arg[i];
 737                 char *recv_arg = strchr(arg, ':');
 738                 ret = -E_MISSING_COLON;
 739                 if (!recv_arg)
 740                         goto out;
 741                 *recv_arg = '\0';
 742                 recv_arg++;
 743                 ret = get_audio_format_num(arg);
 744                 if (ret < 0)
 745                         goto out;
 746                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 747                 if (!afi[ret].receiver_conf) {
 748                         ret = -E_RECV_SYNTAX;
 749                         goto out;
 750                 }
 751                 afi[ret].receiver = &receivers[receiver_num];
 752         }
 753         /* use the first available receiver with no arguments
 754          * for those audio formats for which no receiver
 755          * was specified
 756          */
 757         cmd = para_strdup(receivers[0].name);
 758         FOR_EACH_AUDIO_FORMAT(i) {
 759                 a = &afi[i];
 760                 if (a->receiver_conf)
 761                         continue;
 762                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 763                 if (!a->receiver_conf)
 764                         return -E_RECV_SYNTAX;
 765                 a->receiver = &receivers[receiver_num];
 766         }
 767         ret = 1;
 768 out:
 769         free(cmd);
 770         return ret;
 771 }
 772
 773 static int init_default_filters(void)
 774 {
 775         int i, ret = 1;
 776
 777         FOR_EACH_AUDIO_FORMAT(i) {
 778                 struct audio_format_info *a = &afi[i];
 779                 char *tmp;
 780                 int j;
 781
 782                 if (a->num_filters)
 783                         continue; /* no default -- nothing to to */
 784                 /* add "dec" to audio format name */
 785                 tmp = make_message("%sdec", audio_formats[i]);
 786                 for (j = 0; filters[j].name; j++)
 787                         if (!strcmp(tmp, filters[j].name))
 788                                 break;
 789                 free(tmp);
 790                 ret = -E_UNSUPPORTED_FILTER;
 791                 if (!filters[j].name)
 792                         goto out;
 793                 tmp = para_strdup(filters[j].name);
 794                 ret = add_filter(i, tmp);
 795                 free(tmp);
 796                 if (ret < 0)
 797                         goto out;
 798                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 799                         filters[j].name);
 800         }
 801 out:
 802         return ret;
 803 }
 804
 805 static int init_filters(void)
 806 {
 807         int i, ret, nf;
 808
 809         filter_init(filters);
 810         nf = PARA_MAX(1,  conf.filter_given);
 811         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 812         FOR_EACH_AUDIO_FORMAT(i) {
 813                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 814                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
 815         }
 816         if (!conf.no_default_filters_given)
 817                 return init_default_filters();
 818         for (i = 0; i < conf.filter_given; i++) {
 819                 char *arg = conf.filter_arg[i];
 820                 char *filter_name = strchr(arg, ':');
 821                 ret = -E_MISSING_COLON;
 822                 if (!filter_name)
 823                         goto out;
 824                 *filter_name = '\0';
 825                 filter_name++;
 826                 ret = get_audio_format_num(arg);
 827                 if (ret < 0)
 828                         goto out;
 829                 ret = add_filter(ret, filter_name);
 830                 if (ret < 0)
 831                         goto out;
 832         }
 833         ret = init_default_filters(); /* use default values for the rest */
 834 out:
 835         return ret;
 836 }
 837
 838 static int init_stream_io(void)
 839 {
 840         int ret;
 841
 842         ret = init_writers();
 843         if (ret < 0)
 844                 return ret;
 845         ret = init_receivers();
 846         if (ret < 0)
 847                 return ret;
 848         ret = init_filters();
 849         if (ret < 0)
 850                 return ret;
 851         return 1;
 852 }
 853
 854 static int audiod_get_socket(void)
 855 {
 856         struct sockaddr_un unix_addr;
 857         int fd;
 858
 859         if (conf.socket_given)
 860                 socket_name = para_strdup(conf.socket_arg);
 861         else {
 862                 char *hn = para_hostname();
 863                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 864                         hn);
 865                 free(hn);
 866         }
 867         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 868         if (conf.force_given)
 869                 unlink(socket_name);
 870         fd = create_local_socket(socket_name, &unix_addr,
 871                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 872         if (fd < 0) {
 873                 PARA_EMERG_LOG("can not connect to socket\n");
 874                 exit(EXIT_FAILURE); /* do not unlink socket */
 875         }
 876         if (listen(fd , 5) < 0) {
 877                 PARA_EMERG_LOG("can not listen on socket\n");
 878                 exit(EXIT_FAILURE); /* do not unlink socket */
 879         }
 880         mark_fd_nonblock(fd);
 881         return fd;
 882 }
 883
 884 static void signal_event_handler(struct task *t)
 885 {
 886         struct signal_task *st = t->private_data;
 887
 888         switch (st->signum) {
 889         case SIGINT:
 890         case SIGTERM:
 891         case SIGHUP:
 892                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 893                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 894         }
 895 }
 896
 897 static void signal_pre_select(struct sched *s, struct task *t)
 898 {
 899         struct signal_task *st = t->private_data;
 900         t->ret = 1;
 901         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 902 }
 903
 904 static void signal_post_select(struct sched *s, struct task *t)
 905 {
 906         struct signal_task *st = t->private_data;
 907         t->ret = 1;
 908         if (!FD_ISSET(st->fd, &s->rfds))
 909                 return;
 910         t->ret = -E_SIGNAL_CAUGHT;
 911         st->signum = para_next_signal();
 912 }
 913
 914 static void signal_setup_default(struct signal_task *st)
 915 {
 916         st->task.pre_select = signal_pre_select;
 917         st->task.post_select = signal_post_select;
 918         st->task.private_data = st;
 919         sprintf(st->task.status, "signal task");
 920 }
 921
 922 static void command_pre_select(struct sched *s, struct task *t)
 923 {
 924         struct command_task *ct = t->private_data;
 925         t->ret = 1;
 926         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 927
 928 }
 929
 930 static void command_post_select(struct sched *s, struct task *t)
 931 {
 932         int ret;
 933         struct command_task *ct = t->private_data;
 934
 935         t->ret = 1; /* always successful */
 936         audiod_status_dump();
 937         if (!FD_ISSET(ct->fd, &s->rfds))
 938                 return;
 939         ret = handle_connect(ct->fd);
 940         if (ret < 0)
 941                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 942 }
 943
 944 static void init_command_task(struct command_task *ct)
 945 {
 946         ct->task.pre_select = command_pre_select;
 947         ct->task.post_select = command_post_select;
 948         ct->task.event_handler = NULL;
 949         ct->task.private_data = ct;
 950         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 951         sprintf(ct->task.status, "command task");
 952 }
 953
 954 static void close_stat_pipe(void)
 955 {
 956         int i;
 957
 958         if (!stat_task->pcd)
 959                 return;
 960         client_close(stat_task->pcd);
 961         stat_task->pcd = NULL;
 962         for (i = 0; i < NUM_STAT_ITEMS; i++) {
 963                 free(stat_task->stat_item_values[i]);
 964                 stat_task->stat_item_values[i] = NULL;
 965         }
 966         dump_empty_status();
 967         stat_task->length_seconds = 0;
 968         stat_task->offset_seconds = 0;
 969         audiod_status_dump();
 970         stat_task->playing = 0;
 971         stat_task->stat_item_values[SI_STATUS_BAR] = make_message(
 972                 "%s:no connection to para_server\n",
 973                 status_item_list[SI_STATUS_BAR]);
 974         stat_client_write(stat_task->stat_item_values[SI_STATUS_BAR],
 975                 SI_STATUS_BAR);
 976         if (stat_task->clock_diff_count) {
 977                 stat_task->clock_diff_barrier.tv_sec = now->tv_sec + 1;
 978                 stat_task->clock_diff_barrier.tv_usec = now->tv_usec;
 979         }
 980 }
 981
 982 /**
 983  * close the connection to para_server and exit
 984  *
 985  * \param status the exit status which is passed to exit(3)
 986  * \param msg the log message
 987  *
 988  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
 989  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
 990  * EXIT_FAILURE.
 991  *
 992  * \sa exit(3)
 993  */
 994 void __noreturn clean_exit(int status, const char *msg)
 995 {
 996         PARA_EMERG_LOG("%s\n", msg);
 997         if (socket_name)
 998                 unlink(socket_name);
 999         close_stat_pipe();
1000         exit(status);
1001 }
1002
1003 /* avoid busy loop if server is down */
1004 static void set_stat_task_restart_barrier(void)
1005 {
1006         struct timeval delay = {5, 0};
1007         tv_add(now, &delay, &stat_task->restart_barrier);
1008 }
1009
1010 static void client_task_event_handler(__a_unused struct task *t)
1011 {
1012         int i;
1013
1014         if (t->ret == -E_HANDSHAKE_COMPLETE)
1015                 return;
1016         unregister_task(t);
1017         close_stat_pipe();
1018         if (t->ret != -E_SERVER_EOF)
1019                 stat_task->clock_diff_count = conf.clock_diff_count_arg;
1020         set_stat_task_restart_barrier();
1021         FOR_EACH_AUDIO_FORMAT(i)
1022                 afi[i].restart_barrier = stat_task->restart_barrier;
1023 }
1024
1025 static void status_pre_select(struct sched *s, struct task *t)
1026 {
1027         struct status_task *st = t->private_data;
1028         int ret;
1029
1030         t->ret = 1; /* always successful */
1031         if (st->pcd || audiod_status == AUDIOD_OFF)
1032                 return;
1033         if (!st->clock_diff_count && tv_diff(now, &st->restart_barrier, NULL)
1034                         < 0)
1035                 return;
1036         if (st->clock_diff_count) {
1037                 char *argv[] = {"audiod", "stat", "1", NULL};
1038                 int argc = 3;
1039                 if (tv_diff(now, &st->clock_diff_barrier, NULL) < 0)
1040                         return;
1041                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1042                 ret = client_open(argc, argv, &st->pcd);
1043
1044         } else {
1045                 char *argv[] = {"audiod", "stat", NULL};
1046                 int argc = 2;
1047                 ret = client_open(argc, argv, &st->pcd);
1048         }
1049         set_stat_task_restart_barrier();
1050         if (ret < 0)
1051                 return;
1052         st->pcd->task.event_handler = client_task_event_handler;
1053         s->timeout.tv_sec = 0;
1054         s->timeout.tv_usec = 1;
1055 }
1056
1057 static void status_post_select(__a_unused struct sched *s, struct task *t)
1058 {
1059         struct status_task *st = t->private_data;
1060         unsigned bytes_left;
1061
1062         t->ret = 1;
1063         if (!st->pcd || st->pcd->status != CL_RECEIVING)
1064                 return;
1065         if (st->pcd && audiod_status == AUDIOD_OFF) {
1066                 unregister_task(&st->pcd->task);
1067                 close_stat_pipe();
1068                 st->clock_diff_count = conf.clock_diff_count_arg;
1069                 return;
1070         }
1071         bytes_left = for_each_line(st->pcd->buf, st->pcd->loaded,
1072                 &check_stat_line, NULL);
1073         if (st->pcd->loaded != bytes_left) {
1074                 st->last_status_read = *now;
1075                 st->pcd->loaded = bytes_left;
1076         } else {
1077                 struct timeval diff;
1078                 tv_diff(now, &st->last_status_read, &diff);
1079                 if (diff.tv_sec > 61)
1080                         close_stat_pipe();
1081         }
1082 }
1083
1084 static void init_status_task(struct status_task *st)
1085 {
1086         memset(st, 0, sizeof(struct status_task));
1087         st->task.pre_select = status_pre_select;
1088         st->task.post_select = status_post_select;
1089         st->task.private_data = st;
1090         st->sa_time_diff_sign = 1;
1091         st->clock_diff_count = conf.clock_diff_count_arg;
1092         sprintf(st->task.status, "status task");
1093 }
1094
1095 static void set_initial_status(void)
1096 {
1097         audiod_status = AUDIOD_ON;
1098         if (!conf.mode_given)
1099                 return;
1100         if (!strcmp(conf.mode_arg, "sb")) {
1101                 audiod_status = AUDIOD_STANDBY;
1102                 return;
1103         }
1104         if (!strcmp(conf.mode_arg, "off")) {
1105                 audiod_status = AUDIOD_OFF;
1106                 return;
1107         }
1108         if (strcmp(conf.mode_arg, "on"))
1109                 PARA_WARNING_LOG("%s", "invalid mode\n");
1110 }
1111
1112 /**
1113  * the main function of para_audiod
1114  *
1115  * \param argc usual argument count
1116  * \param argv usual argument vector
1117  *
1118  * \return EXIT_SUCCESS or EXIT_FAILURE
1119  *
1120  * \sa para_audiod(1)
1121  * */
1122 int main(int argc, char *argv[])
1123 {
1124         char *config_file;
1125         int ret, i;
1126         struct sched s;
1127         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1128         struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1129
1130         valid_fd_012();
1131         audiod_cmdline_parser(argc, argv, &conf);
1132         HANDLE_VERSION_FLAG("audiod", conf);
1133         para_drop_privileges(conf.user_arg, conf.group_arg);
1134         config_file = configfile_exists();
1135         if (config_file) {
1136                 struct audiod_cmdline_parser_params params = {
1137                         .override = 0,
1138                         .initialize = 0,
1139                         .check_required = 0,
1140                         .check_ambiguity = 0
1141
1142                 };
1143                 if (audiod_cmdline_parser_config_file(config_file, &conf, &params)) {
1144                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1145                         exit(EXIT_FAILURE);
1146                 }
1147                 free(config_file);
1148         }
1149         if (conf.logfile_given)
1150                 logfile = open_log(conf.logfile_arg);
1151         log_welcome("para_audiod", conf.loglevel_arg);
1152         i = init_stream_io();
1153         if (i < 0) {
1154                 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1155                 exit(EXIT_FAILURE);
1156         }
1157         server_uptime(UPTIME_SET);
1158         set_initial_status();
1159         FOR_EACH_SLOT(i)
1160                 clear_slot(i);
1161         init_grabbing();
1162         setup_signal_handling();
1163         signal_setup_default(sig_task);
1164         sig_task->task.event_handler = signal_event_handler;
1165
1166         init_status_task(stat_task);
1167         init_command_task(cmd_task);
1168         init_audiod_task(audiod_task);
1169
1170         if (conf.daemon_given)
1171                 daemon_init();
1172
1173         register_task(&sig_task->task);
1174         register_task(&cmd_task->task);
1175         register_task(&stat_task->task);
1176         register_task(audiod_task);
1177         s.default_timeout.tv_sec = 0;
1178         s.default_timeout.tv_usec = 99 * 1000;
1179         ret = sched(&s);
1180
1181         PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1182         return EXIT_FAILURE;
1183 }