audiod.c

   1 /*
   2  * Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>
   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 <netinet/in.h>
  10 #include <sys/socket.h>
  11 #include <regex.h>
  12 #include <sys/types.h>
  13 #include <arpa/inet.h>
  14 #include <sys/un.h>
  15 #include <netdb.h>
  16 #include <signal.h>
  17
  18 #include "para.h"
  19 #include "error.h"
  20 #include "crypt.h"
  21 #include "audiod.cmdline.h"
  22 #include "list.h"
  23 #include "sched.h"
  24 #include "ggo.h"
  25 #include "buffer_tree.h"
  26 #include "recv.h"
  27 #include "filter.h"
  28 #include "grab_client.h"
  29 #include "client.cmdline.h"
  30 #include "client.h"
  31 #include "audiod.h"
  32 #include "net.h"
  33 #include "daemon.h"
  34 #include "string.h"
  35 #include "fd.h"
  36 #include "write.h"
  37 #include "write_common.h"
  38 #include "signal.h"
  39 #include "version.h"
  40
  41 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
  42 /** define the array of error lists needed by para_audiod */
  43 INIT_AUDIOD_ERRLISTS;
  44 /** define the array containing all supported audio formats */
  45 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
  46
  47 DEFINE_RECEIVER_ARRAY;
  48
  49 /** Defines how audiod handles one supported audio format. */
  50 struct audio_format_info {
  51         /** pointer to the receiver for this audio format */
  52         struct receiver *receiver;
  53         /** the receiver configuration */
  54         void *receiver_conf;
  55         /** the number of filters that should be activated for this audio format */
  56         unsigned int num_filters;
  57         /** Array of filter numbers to be activated. */
  58         unsigned *filter_nums;
  59         /** Pointer to the array of filter configurations. */
  60         void **filter_conf;
  61         /** the number of filters that should be activated for this audio format */
  62         unsigned int num_writers;
  63         /** Array of writer numbers to be activated. */
  64         int *writer_nums;
  65         /** pointer to the array of writer configurations */
  66         void **writer_conf;
  67         /** do not start receiver/filters/writer before this time */
  68         struct timeval restart_barrier;
  69 };
  70
  71 /**
  72  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  73  * be associated with a receiver/filter/writer triple. This array holds all
  74  * information on the status of these slots.
  75  *
  76  * \sa struct slot_info
  77  * */
  78 struct slot_info slot[MAX_STREAM_SLOTS];
  79
  80 /** The vss status flags audiod is interested in. */
  81 enum vss_status_flags {
  82         /** Whether the 'N' flag is set. */
  83         VSS_STATUS_FLAG_NEXT = 1,
  84         /** The 'P' flag is set. */
  85         VSS_STATUS_FLAG_PLAYING = 2,
  86 };
  87
  88 /**
  89  * The scheduler instance of para_audiod.
  90  *
  91  * This is needed also in audiod_command.c (for the tasks command), so it can
  92  * not be made static.
  93  */
  94 struct sched sched = {.max_fileno = 0};
  95
  96 /* The task for obtaining para_server's status (para_client stat). */
  97 struct status_task {
  98         /** The associated task structure of audiod. */
  99         struct task *task;
 100         /** Client data associated with the stat task. */
 101         struct client_task *ct;
 102         /** Do not restart client command until this time. */
 103         struct timeval restart_barrier;
 104         /** Last time we received status data from para_server. */
 105         struct timeval last_status_read;
 106         size_t min_iqs;
 107         /** The offset value announced by para_server. */
 108         int offset_seconds;
 109         /** The length of the current audio file as announced by para_server. */
 110         int length_seconds;
 111         /** The start of the current stream from the view of para_server. */
 112         struct timeval server_stream_start;
 113         /** The average time deviation between para_server and para_audiod. */
 114         struct timeval sa_time_diff;
 115         /** Whether client time is ahead of server time. */
 116         int sa_time_diff_sign;
 117         /** The 'P' and the 'N' flags as announced by para_server. */
 118         enum vss_status_flags vss_status;
 119         /** Number of times the clock difference is to be checked. */
 120         unsigned clock_diff_count;
 121         /** When to start the next check for clock difference. */
 122         struct timeval clock_diff_barrier;
 123         /** Number of the audio format as announced by para_server. */
 124         int current_audio_format_num;
 125         /* The status task btrn is the child of the client task. */
 126         struct btr_node *btrn;
 127 };
 128
 129 /** The array of status items sent by para_server. */
 130 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
 131
 132 /**
 133  * the current mode of operation of which can be changed by the on/off/cycle
 134  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
 135  */
 136 int audiod_status = AUDIOD_ON;
 137
 138 /**
 139  * the gengetopt args_info struct that holds information on all command line
 140  * arguments
 141  */
 142 struct audiod_args_info conf;
 143
 144 static char *socket_name;
 145 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 146
 147 static struct signal_task *signal_task;
 148
 149 static struct status_task status_task_struct;
 150
 151 /**
 152  * the task that calls the status command of para_server
 153  *
 154  * \sa struct status_task
 155  */
 156 static struct status_task *stat_task = &status_task_struct;
 157
 158 /*
 159  * The task for handling audiod commands.
 160  *
 161  * We need two listening sockets for backward compability: on Linux systems
 162  * fd[0] is an abstract socket (more precisely, a socket bound to an address in
 163  * the abstract namespace), and fd[1] is the usual pathname socket. On other
 164  * systems, fd[0] is negative, and only the pathname socket is used.
 165  *
 166  * For 0.5.x we accept connections on both sockets to make sure that old
 167  * para_audioc versions can still connect. New versions use only the abstract
 168  * socket. Hence after v0.6.0 we can go back to a single socket, either an
 169  * abstract one (Linux) or a pathname socket (all other systems).
 170  */
 171 struct command_task {
 172         /** The local listening sockets. */
 173         int fd[2];
 174         /** the associated task structure */
 175         struct task *task;
 176 };
 177
 178 /** iterate over all supported audio formats */
 179 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 180
 181 /**
 182  * Get the audio format number.
 183  *
 184  * \param name The name of the audio format.
 185  *
 186  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 187  * \a name is not a supported audio format.
 188  */
 189 static int get_audio_format_num(const char *name)
 190 {
 191         int i;
 192
 193         while (para_isspace(*name))
 194                 name++;
 195         FOR_EACH_AUDIO_FORMAT(i)
 196                 if (!strcmp(name, audio_formats[i]))
 197                         return i;
 198         return -E_UNSUPPORTED_AUDIO_FORMAT;
 199 }
 200
 201 static int get_matching_audio_format_nums(const char *re)
 202 {
 203         int i, ret;
 204         regex_t preg;
 205
 206         ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
 207         if (ret < 0)
 208                 return ret;
 209         ret = 0;
 210         FOR_EACH_AUDIO_FORMAT(i)
 211                 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
 212                         ret |= (1 << i);
 213         regfree(&preg);
 214         return ret;
 215 }
 216
 217 /**
 218  * Compute the play time based on information of the given slot.
 219  *
 220  * \param slot_num The slot number (negative means: no slot).
 221  *
 222  * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
 223  * from the status items received from para_server and the start time of the
 224  * (first) writer of the given slot.
 225  *
 226  * It has to take into account that the stream was probably not started at
 227  * the beginning of the file, that the clock between the server and the client
 228  * host may differ and that playback of the stream was delayed, e.g. because
 229  * the prebuffer filter is used in the filter configuration of the given slot.
 230  *
 231  * If no writer is active in the given slot, or \a slot_num is negative
 232  * (indicating that para_audiod runs in standby mode), an approximation based
 233  * only on the status items is computed and the returned string is prefixed
 234  * with "~".
 235  *
 236  * \return A string that must be freed by the caller.
 237  */
 238 char *get_time_string(int slot_num)
 239 {
 240         int ret, seconds = 0, length;
 241         struct timeval *tmp, sum, sss, /* server stream start */
 242                 rstime, /* receiver start time */
 243                 wstime, /* writer start time */
 244                 wtime, /* now - writer start */
 245                 rskip; /* receiver start - sss */
 246         struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
 247         char *msg;
 248
 249         if (audiod_status == AUDIOD_OFF)
 250                 goto empty;
 251         if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
 252                 if (stat_task->length_seconds) /* paused */
 253                         return NULL;
 254                 goto empty; /* stopped */
 255         }
 256         if (audiod_status == AUDIOD_ON && !s)
 257                 goto empty;
 258         /*
 259          * Valid status items and playing, set length and tmp to the stream
 260          * start. We use the slot info and fall back to the info from current
 261          * status items if no slot info is available.
 262          */
 263         length = stat_task->length_seconds;
 264         tmp = &stat_task->server_stream_start;
 265         if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
 266                 btr_get_node_start(s->wns[0].btrn, &wstime);
 267                 if (wstime.tv_sec != 0) { /* writer wrote something */
 268                         if (s->server_stream_start.tv_sec == 0) {
 269                                 /* copy status info to slot */
 270                                 s->server_stream_start = stat_task->server_stream_start;
 271                                 s->offset_seconds = stat_task->offset_seconds;
 272                                 s->seconds_total = stat_task->length_seconds;
 273                         }
 274                         length = s->seconds_total;
 275                         tmp = &s->server_stream_start;
 276                 }
 277         }
 278         if (stat_task->sa_time_diff_sign > 0)
 279                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
 280         else
 281                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
 282         if (!s || !s->wns || !s->wns[0].btrn) {
 283                 struct timeval diff;
 284                 tv_diff(now, &sss, &diff);
 285                 seconds = diff.tv_sec + stat_task->offset_seconds;
 286                 goto out;
 287         }
 288         tv_diff(now, &wstime, &wtime);
 289         //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
 290         seconds = s->offset_seconds;
 291         if (s->receiver_node->btrn) {
 292                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 293                 ret = tv_diff(&rstime, &sss, &rskip);
 294                 if (ret > 0) { /* audiod was started in the middle of the stream */
 295                         tv_add(&wtime, &rskip, &sum);
 296                         seconds += sum.tv_sec;
 297                 } else
 298                         seconds += wtime.tv_sec;
 299         } else
 300                 seconds += wtime.tv_sec;
 301 out:
 302         seconds = PARA_MIN(seconds, length);
 303         seconds = PARA_MAX(seconds, 0);
 304         msg = make_message(
 305                 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
 306                 s? "" : "~",
 307                 seconds / 60,
 308                 seconds % 60,
 309                 (length - seconds) / 60,
 310                 (length - seconds) % 60,
 311                 length? (seconds * 100 + length / 2) / length : 0,
 312                 length / 60,
 313                 length % 60
 314         );
 315         //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
 316         return msg;
 317 empty:
 318         return para_strdup(NULL);
 319 }
 320
 321 static void parse_config_or_die(void)
 322 {
 323         int ret;
 324         char *config_file;
 325         struct audiod_cmdline_parser_params params = {
 326                 .override = 0,
 327                 .initialize = 0,
 328                 .check_required = 1,
 329                 .check_ambiguity = 0,
 330                 .print_errors = 1
 331         };
 332
 333         if (conf.config_file_given)
 334                 config_file = para_strdup(conf.config_file_arg);
 335         else {
 336                 char *home = para_homedir();
 337                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 338                 free(home);
 339         }
 340         ret = file_exists(config_file);
 341         if (conf.config_file_given && !ret) {
 342                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 343                 goto err;
 344         }
 345         if (ret) {
 346                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 347                 daemon_set_loglevel(conf.loglevel_arg);
 348         }
 349         free(config_file);
 350         return;
 351 err:
 352         free(config_file);
 353         exit(EXIT_FAILURE);
 354 }
 355
 356 static void setup_signal_handling(void)
 357 {
 358         signal_task = signal_init_or_die();
 359         para_install_sighandler(SIGINT);
 360         para_install_sighandler(SIGTERM);
 361         para_install_sighandler(SIGHUP);
 362         para_sigaction(SIGPIPE, SIG_IGN);
 363 }
 364
 365 static void clear_slot(int slot_num)
 366 {
 367         struct slot_info *s = &slot[slot_num];
 368
 369         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 370         memset(s, 0, sizeof(struct slot_info));
 371         s->format = -1;
 372 }
 373
 374 static void close_receiver(int slot_num)
 375 {
 376         struct slot_info *s = &slot[slot_num];
 377         struct audio_format_info *a;
 378
 379         if (s->format < 0 || !s->receiver_node)
 380                 return;
 381         a = &afi[s->format];
 382         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 383                 audio_formats[s->format], slot_num);
 384         a->receiver->close(s->receiver_node);
 385         btr_remove_node(&s->receiver_node->btrn);
 386         task_reap(&s->receiver_node->task);
 387         free(s->receiver_node);
 388         s->receiver_node = NULL;
 389         stat_task->current_audio_format_num = -1;
 390         tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
 391                 &a->restart_barrier);
 392 }
 393
 394 static void writer_cleanup(struct writer_node *wn)
 395 {
 396         struct writer *w;
 397
 398         if (!wn)
 399                 return;
 400         w = writers + wn->writer_num;
 401         PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
 402         w->close(wn);
 403         btr_remove_node(&wn->btrn);
 404         task_reap(&wn->task);
 405 }
 406
 407 static void close_writers(struct slot_info *s)
 408 {
 409         struct audio_format_info *a;
 410         int i;
 411
 412         if (s->format < 0)
 413                 return;
 414         assert(s->wns);
 415         a = afi + s->format;
 416         if (a->num_writers == 0)
 417                 writer_cleanup(s->wns);
 418         else {
 419                 for (i = 0; i < a->num_writers; i++)
 420                         writer_cleanup(s->wns + i);
 421         }
 422         free(s->wns);
 423         s->wns = NULL;
 424 }
 425
 426 static void close_filters(struct slot_info *s)
 427 {
 428         int i;
 429         struct audio_format_info *a = afi + s->format;
 430         if (a->num_filters == 0)
 431                 return;
 432         for (i = a->num_filters - 1; i >= 0; i--) {
 433                 struct filter_node *fn = s->fns + i;
 434                 struct filter *f;
 435
 436                 if (!fn)
 437                         continue;
 438                 f = filters + fn->filter_num;
 439                 if (f->close)
 440                         f->close(fn);
 441                 btr_remove_node(&fn->btrn);
 442                 task_reap(&fn->task);
 443         }
 444         free(s->fns);
 445         s->fns = NULL;
 446 }
 447
 448 static void notify_receivers(int error)
 449 {
 450         int i;
 451
 452         FOR_EACH_SLOT(i) {
 453                 struct slot_info *s = slot + i;
 454                 if (s->format < 0)
 455                         continue;
 456                 if (!s->receiver_node)
 457                         continue;
 458                 task_notify(s->receiver_node->task, error);
 459         }
 460 }
 461
 462 static int get_empty_slot(void)
 463 {
 464         int i;
 465         struct slot_info *s;
 466
 467         FOR_EACH_SLOT(i) {
 468                 s = &slot[i];
 469                 if (s->format < 0) {
 470                         clear_slot(i);
 471                         return i;
 472                 }
 473                 if (s->wns || s->receiver_node || s->fns)
 474                         continue;
 475                 clear_slot(i);
 476                 return i;
 477         }
 478         return -E_NO_MORE_SLOTS;
 479 }
 480
 481 static void open_filters(struct slot_info *s)
 482 {
 483         struct audio_format_info *a = afi + s->format;
 484         struct filter_node *fn;
 485         int nf = a->num_filters;
 486         struct btr_node *parent;
 487         int i;
 488
 489         if (nf == 0)
 490                 return;
 491         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 492         assert(s->fns == NULL);
 493         s->fns = para_calloc(nf * sizeof(struct filter_node));
 494         parent = s->receiver_node->btrn;
 495         for (i = 0; i < nf; i++) {
 496                 char buf[20];
 497                 struct filter *f = filters + a->filter_nums[i];
 498                 fn = s->fns + i;
 499                 fn->filter_num = a->filter_nums[i];
 500                 fn->conf = a->filter_conf[i];
 501                 fn->btrn = btr_new_node(&(struct btr_node_description)
 502                         EMBRACE(.name = f->name, .parent = parent,
 503                                 .handler = f->execute, .context = fn));
 504
 505                 f->open(fn);
 506                 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
 507                 fn->task = task_register(&(struct task_info) {
 508                         .name = buf,
 509                         .pre_select = f->pre_select,
 510                         .post_select = f->post_select,
 511                         .context = fn,
 512                 }, &sched);
 513                 parent = fn->btrn;
 514                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 515                         audio_formats[s->format], i,  nf, f->name, (int)(s - slot));
 516         }
 517 }
 518
 519 static void open_writers(struct slot_info *s)
 520 {
 521         int i;
 522         struct audio_format_info *a = afi + s->format;
 523         struct writer_node *wn;
 524         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 525
 526         assert(s->wns == NULL);
 527         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 528                 * sizeof(struct writer_node));
 529         for (i = 0; i < a->num_writers; i++) {
 530                 wn = s->wns + i;
 531                 wn->conf = a->writer_conf[i];
 532                 wn->writer_num = a->writer_nums[i];
 533                 register_writer_node(wn, parent, &sched);
 534                 PARA_NOTICE_LOG("%s writer started in slot %d\n",
 535                         writer_names[a->writer_nums[i]], (int)(s - slot));
 536         }
 537 }
 538
 539 /* returns slot num on success */
 540 static int open_receiver(int format)
 541 {
 542         struct audio_format_info *a = &afi[format];
 543         struct slot_info *s;
 544         int ret, slot_num;
 545         struct receiver *r = a->receiver;
 546         struct receiver_node *rn;
 547
 548         tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
 549         ret = get_empty_slot();
 550         if (ret < 0)
 551                 return ret;
 552         slot_num = ret;
 553         rn = para_calloc(sizeof(*rn));
 554         rn->receiver = r;
 555         rn->conf = a->receiver_conf;
 556         rn->btrn = btr_new_node(&(struct btr_node_description)
 557                 EMBRACE(.name = r->name, .context = rn));
 558         ret = r->open(rn);
 559         if (ret < 0) {
 560                 btr_remove_node(&rn->btrn);
 561                 free(rn);
 562                 return ret;
 563         }
 564         s = &slot[slot_num];
 565         s->format = format;
 566         s->receiver_node = rn;
 567         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 568                 audio_formats[format], r->name, slot_num);
 569         rn->task = task_register(&(struct task_info) {
 570                 .name = r->name,
 571                 .pre_select = r->pre_select,
 572                 .post_select = r->post_select,
 573                 .context = rn,
 574         }, &sched);
 575         return slot_num;
 576 }
 577
 578 static bool receiver_running(void)
 579 {
 580         int i;
 581         long unsigned ss1 = stat_task->server_stream_start.tv_sec;
 582
 583         FOR_EACH_SLOT(i) {
 584                 struct slot_info *s = &slot[i];
 585                 long unsigned ss2 = s->server_stream_start.tv_sec;
 586
 587                 if (!s->receiver_node)
 588                         continue;
 589                 if (task_status(s->receiver_node->task) >= 0)
 590                         return true;
 591                 if (ss1 == ss2)
 592                         return true;
 593         }
 594         return false;
 595 }
 596
 597 /**
 598  * Return the root node of the current buffer tree.
 599  *
 600  * This is only used for stream grabbing.
 601  *
 602  * \return \p NULL if no slot is currently active. If more than one buffer tree
 603  * exists, the node corresponding to the most recently started receiver is
 604  * returned.
 605  */
 606 struct btr_node *audiod_get_btr_root(void)
 607 {
 608         int i, newest_slot = -1;
 609         struct timeval newest_rstime = {0, 0};
 610
 611         FOR_EACH_SLOT(i) {
 612                 struct slot_info *s = &slot[i];
 613                 struct timeval rstime;
 614                 if (!s->receiver_node)
 615                         continue;
 616                 if (task_status(s->receiver_node->task) < 0)
 617                         continue;
 618                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 619                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 620                         continue;
 621                 newest_rstime = rstime;
 622                 newest_slot = i;
 623         }
 624         if (newest_slot == -1)
 625                 return NULL;
 626         return slot[newest_slot].receiver_node->btrn;
 627 }
 628
 629 /* whether a new instance of a decoder should be started. */
 630 static bool must_start_decoder(void)
 631 {
 632         int cafn = stat_task->current_audio_format_num;
 633         unsigned vs = stat_task->vss_status;
 634
 635         if (audiod_status != AUDIOD_ON)
 636                 return false;
 637         if (cafn < 0)
 638                 return false;
 639         if (!stat_task->ct)
 640                 return false;
 641         if (vs & VSS_STATUS_FLAG_NEXT)
 642                 return false;
 643         if (!(vs & VSS_STATUS_FLAG_PLAYING))
 644                 return false;
 645         if (receiver_running())
 646                 return false;
 647         if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
 648                 return false;
 649         return true;
 650 }
 651
 652 static void compute_time_diff(const struct timeval *status_time)
 653 {
 654         struct timeval tmp, diff;
 655         static unsigned count;
 656         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 657         const struct timeval max_deviation = {0, 500 * 1000};
 658         const int time_smooth = 5;
 659
 660         sign = tv_diff(status_time, now, &diff);
 661 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 662 //                      sign, sa_time_diff_sign);
 663         if (!count) {
 664                 sa_time_diff_sign = sign;
 665                 stat_task->sa_time_diff = diff;
 666                 count++;
 667                 goto out;
 668         }
 669         if (count > 5) {
 670                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 671                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 672                         PARA_WARNING_LOG("time diff jump: %lims\n",
 673                                 s * tv2ms(&tmp));
 674         }
 675         count++;
 676         sa_time_diff_sign = tv_convex_combination(
 677                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 678                 count > 10? sign : sign * time_smooth, &diff,
 679                 &tmp);
 680         stat_task->sa_time_diff = tmp;
 681         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 682                 sign < 0? "-" : "+",
 683                 tv2ms(&diff),
 684                 sa_time_diff_sign < 0? "-" : "+",
 685                 tv2ms(&stat_task->sa_time_diff)
 686         );
 687 out:
 688         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 689 }
 690
 691 static int update_item(int itemnum, char *buf)
 692 {
 693         long unsigned sec, usec;
 694
 695         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 696                 return 1;
 697         free(stat_item_values[itemnum]);
 698         stat_item_values[itemnum] = para_strdup(buf);
 699         stat_client_write_item(itemnum);
 700         switch (itemnum) {
 701         case SI_STATUS_FLAGS:
 702                 stat_task->vss_status = 0;
 703                 if (strchr(buf, 'N'))
 704                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 705                 if (strchr(buf, 'P'))
 706                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 707                 break;
 708         case SI_OFFSET:
 709                 stat_task->offset_seconds = atoi(buf);
 710                 break;
 711         case SI_SECONDS_TOTAL:
 712                 stat_task->length_seconds = atoi(buf);
 713                 break;
 714         case SI_STREAM_START:
 715                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 716                         stat_task->server_stream_start.tv_sec = sec;
 717                         stat_task->server_stream_start.tv_usec = usec;
 718                 }
 719                 break;
 720         case SI_CURRENT_TIME:
 721                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 722                         struct timeval tv = {sec, usec};
 723                         compute_time_diff(&tv);
 724                 }
 725                 break;
 726         case SI_FORMAT:
 727                 stat_task->current_audio_format_num
 728                         = get_audio_format_num(buf);
 729         }
 730         return 1;
 731 }
 732
 733 static int parse_stream_command(const char *txt, char **cmd)
 734 {
 735         int ret, len;
 736         char *re, *p = strchr(txt, ':');
 737
 738         if (!p)
 739                 return -E_MISSING_COLON;
 740         *cmd = p + 1;
 741         len = p - txt;
 742         re = malloc(len + 1);
 743         strncpy(re, txt, len);
 744         re[len] = '\0';
 745         ret = get_matching_audio_format_nums(re);
 746         free(re);
 747         return ret;
 748 }
 749
 750 static int add_filter(int format, char *cmdline)
 751 {
 752         struct audio_format_info *a = &afi[format];
 753         int filter_num, nf = a->num_filters;
 754         void *cfg;
 755
 756         filter_num = check_filter_arg(cmdline, &cfg);
 757         if (filter_num < 0)
 758                 return filter_num;
 759         a->filter_conf = para_realloc(a->filter_conf,
 760                 (nf + 1) * sizeof(void *));
 761         a->filter_nums = para_realloc(a->filter_nums,
 762                 (nf + 1) * sizeof(unsigned));
 763         a->filter_nums[nf] = filter_num;
 764         a->filter_conf[nf] = cfg;
 765         a->num_filters++;
 766         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 767                 filters[filter_num].name);
 768         return filter_num;
 769 }
 770
 771 static int parse_writer_args(void)
 772 {
 773         int i, ret;
 774         char *cmd;
 775         struct audio_format_info *a;
 776
 777         for (i = 0; i < conf.writer_given; i++) {
 778                 void *wconf;
 779                 int j, nw, writer_num, af_mask;
 780
 781                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 782                 if (ret < 0)
 783                         return ret;
 784                 af_mask = ret;
 785                 FOR_EACH_AUDIO_FORMAT(j) {
 786                         a = afi + j;
 787                         if ((af_mask & (1 << j)) == 0) /* no match */
 788                                 continue;
 789                         wconf = check_writer_arg_or_die(cmd, &writer_num);
 790                         nw = a->num_writers;
 791                         a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
 792                         a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
 793                         a->writer_nums[nw] = writer_num;
 794                         a->writer_conf[nw] = wconf;
 795                         PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
 796                                 nw, writer_names[writer_num]);
 797                         a->num_writers++;
 798                 }
 799         }
 800         /* Use default writer for audio formats which are not yet set up. */
 801         FOR_EACH_AUDIO_FORMAT(i) {
 802                 void *writer_conf;
 803                 int writer_num;
 804                 a = afi + i;
 805                 if (a->num_writers > 0)
 806                         continue; /* already set up */
 807                 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
 808                 a->writer_nums = para_malloc(sizeof(int));
 809                 a->writer_nums[0] = writer_num;
 810                 a->writer_conf = para_malloc(sizeof(void *));
 811                 a->writer_conf[0] = writer_conf;
 812                 a->num_writers = 1;
 813                 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
 814                         writer_names[writer_num]);
 815         }
 816         return 1;
 817 }
 818
 819 static int parse_receiver_args(void)
 820 {
 821         int i, ret, receiver_num;
 822         char *cmd = NULL;
 823         struct audio_format_info *a;
 824
 825         for (i = conf.receiver_given - 1; i >= 0; i--) {
 826                 char *arg;
 827                 int j, af_mask;
 828
 829                 ret = parse_stream_command(conf.receiver_arg[i], &arg);
 830                 if (ret < 0)
 831                         goto out;
 832                 af_mask = ret;
 833                 FOR_EACH_AUDIO_FORMAT(j) {
 834                         a = afi + j;
 835                         if ((af_mask & (1 << j)) == 0) /* no match */
 836                                 continue;
 837                         /*
 838                          * If multiple receivers are given for this audio format, the
 839                          * last one wins and we have to free the previous receiver
 840                          * config here. Since we are iterating backwards, the winning
 841                          * receiver arg is in fact the first one given.
 842                          */
 843                         if (a->receiver_conf)
 844                                 a->receiver->free_config(a->receiver_conf);
 845                         a->receiver_conf = check_receiver_arg(arg, &receiver_num);
 846                         ret = -E_RECV_SYNTAX;
 847                         if (!a->receiver_conf)
 848                                 goto out;
 849                         a->receiver = receivers + receiver_num;
 850                 }
 851         }
 852         /*
 853          * Use the first available receiver with no arguments for those audio
 854          * formats for which no receiver was specified.
 855          */
 856         cmd = para_strdup(receivers[0].name);
 857         FOR_EACH_AUDIO_FORMAT(i) {
 858                 a = &afi[i];
 859                 if (a->receiver_conf)
 860                         continue;
 861                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 862                 if (!a->receiver_conf)
 863                         return -E_RECV_SYNTAX;
 864                 a->receiver = &receivers[receiver_num];
 865         }
 866         FOR_EACH_AUDIO_FORMAT(i) {
 867                 a = afi + i;
 868                 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
 869                         audio_formats[i], a->receiver->name);
 870         }
 871         ret = 1;
 872 out:
 873         free(cmd);
 874         return ret;
 875 }
 876
 877 static int init_default_filters(void)
 878 {
 879         int i, ret = 1;
 880
 881         FOR_EACH_AUDIO_FORMAT(i) {
 882                 struct audio_format_info *a = &afi[i];
 883                 char *tmp;
 884                 int j;
 885
 886                 if (a->num_filters)
 887                         continue; /* no default -- nothing to to */
 888                 /*
 889                  * udp and dccp streams are fec-encoded, so add fecdec as the
 890                  * first filter.
 891                  */
 892                 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
 893                                 strcmp(afi[i].receiver->name, "dccp") == 0) {
 894                         tmp = para_strdup("fecdec");
 895                         add_filter(i, tmp);
 896                         free(tmp);
 897                         if (ret < 0)
 898                                 goto out;
 899                 }
 900                 /* add "dec" to audio format name */
 901                 tmp = make_message("%sdec", audio_formats[i]);
 902                 for (j = 0; filters[j].name; j++)
 903                         if (!strcmp(tmp, filters[j].name))
 904                                 break;
 905                 free(tmp);
 906                 ret = -E_UNSUPPORTED_FILTER;
 907                 if (!filters[j].name)
 908                         goto out;
 909                 tmp = para_strdup(filters[j].name);
 910                 ret = add_filter(i, tmp);
 911                 free(tmp);
 912                 if (ret < 0)
 913                         goto out;
 914                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 915                         filters[j].name);
 916         }
 917 out:
 918         return ret;
 919 }
 920
 921 static int parse_filter_args(void)
 922 {
 923         int i, j, ret, af_mask, num_matches;
 924
 925         for (i = 0; i < conf.filter_given; i++) {
 926                 char *arg;
 927                 ret = parse_stream_command(conf.filter_arg[i], &arg);
 928                 if (ret < 0)
 929                         goto out;
 930                 af_mask = ret;
 931                 num_matches = 0;
 932                 FOR_EACH_AUDIO_FORMAT(j) {
 933                         if ((af_mask & (1 << j)) == 0) /* no match */
 934                                 continue;
 935                         ret = add_filter(j, arg);
 936                         if (ret < 0)
 937                                 goto out;
 938                         num_matches++;
 939                 }
 940                 if (num_matches == 0)
 941                         PARA_WARNING_LOG("ignoring filter spec: %s\n",
 942                                 conf.filter_arg[i]);
 943         }
 944         ret = init_default_filters(); /* use default values for the rest */
 945 out:
 946         return ret;
 947 }
 948
 949 static int parse_stream_args(void)
 950 {
 951         int ret;
 952
 953         ret = parse_receiver_args();
 954         if (ret < 0)
 955                 return ret;
 956         ret = parse_filter_args();
 957         if (ret < 0)
 958                 return ret;
 959         ret = parse_writer_args();
 960         if (ret < 0)
 961                 return ret;
 962         return 1;
 963 }
 964
 965 /* does not unlink socket on errors */
 966 static void init_local_sockets(struct command_task *ct)
 967 {
 968         if (conf.socket_given)
 969                 socket_name = para_strdup(conf.socket_arg);
 970         else {
 971                 char *hn = para_hostname();
 972                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 973                         hn);
 974                 free(hn);
 975         }
 976         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 977         if (conf.force_given)
 978                 unlink(socket_name);
 979         ct->fd[0] = create_local_socket(socket_name, 0);
 980         ct->fd[1] = create_local_socket(socket_name,
 981                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 982         if (ct->fd[0] >= 0 || ct->fd[1] >= 0)
 983                 return;
 984         PARA_EMERG_LOG("%s\n", para_strerror(-ct->fd[1]));
 985         exit(EXIT_FAILURE);
 986 }
 987
 988 static int signal_post_select(struct sched *s, void *context)
 989 {
 990         struct signal_task *st = context;
 991         int ret, signum;
 992
 993         ret = task_get_notification(st->task);
 994         if (ret < 0)
 995                 return ret;
 996         signum = para_next_signal(&s->rfds);
 997         switch (signum) {
 998         case SIGINT:
 999         case SIGTERM:
1000         case SIGHUP:
1001                 PARA_NOTICE_LOG("received signal %d\n", signum);
1002                 task_notify_all(s, E_AUDIOD_SIGNAL);
1003                 return -E_AUDIOD_SIGNAL;
1004         }
1005         return 0;
1006 }
1007
1008 static void command_pre_select(struct sched *s, void *context)
1009 {
1010         struct command_task *ct = context;
1011         int i;
1012
1013         for (i = 0; i < 2; i++)
1014                 if (ct->fd[i] >= 0)
1015                         para_fd_set(ct->fd[i], &s->rfds, &s->max_fileno);
1016 }
1017
1018 static int command_post_select(struct sched *s, void *context)
1019 {
1020         int ret, i;
1021         struct command_task *ct = context;
1022         static struct timeval last_status_dump;
1023         struct timeval tmp, delay;
1024         bool force = false;
1025
1026         ret = task_get_notification(ct->task);
1027         if (ret < 0)
1028                 return ret;
1029         for (i = 0; i < 2; i++) {
1030                 if (ct->fd[i] < 0)
1031                         continue;
1032                 ret = handle_connect(ct->fd[i], &s->rfds);
1033                 if (ret < 0) {
1034                         PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1035                         if (ret == -E_AUDIOD_TERM) {
1036                                 task_notify_all(s, -ret);
1037                                 return ret;
1038                         }
1039                 } else if (ret > 0)
1040                         force = true;
1041         }
1042         if (force == true)
1043                 goto dump;
1044
1045         /* if last status dump was less than 500ms ago, do nothing */
1046         delay.tv_sec = 0;
1047         delay.tv_usec = 500 * 1000;
1048         tv_add(&last_status_dump, &delay, &tmp);
1049         if (tv_diff(now, &tmp, NULL) < 0)
1050                 return 0;
1051
1052         /*
1053          * If last status dump was more than 5s ago, force update. Otherwise,
1054          * update only those items that have changed.
1055          */
1056         delay.tv_sec = 5;
1057         delay.tv_usec = 0;
1058         tv_add(&last_status_dump, &delay, &tmp);
1059         if (tv_diff(now, &tmp, NULL) > 0)
1060                 force = true;
1061 dump:
1062         audiod_status_dump(force);
1063         last_status_dump = *now;
1064         return 1;
1065 }
1066
1067 static void init_command_task(struct command_task *ct)
1068 {
1069         init_local_sockets(ct); /* doesn't return on errors */
1070
1071         ct->task = task_register(&(struct task_info) {
1072                 .name = "command",
1073                 .pre_select = command_pre_select,
1074                 .post_select = command_post_select,
1075                 .context = ct,
1076         }, &sched);
1077 }
1078
1079 static void close_stat_pipe(void)
1080 {
1081         if (!stat_task->ct)
1082                 return;
1083         task_reap(&stat_task->ct->task);
1084         client_close(stat_task->ct);
1085         stat_task->ct = NULL;
1086         clear_and_dump_items();
1087         stat_task->length_seconds = 0;
1088         stat_task->offset_seconds = 0;
1089         stat_task->vss_status = 0;
1090         stat_task->current_audio_format_num = -1;
1091         audiod_status_dump(true);
1092 }
1093
1094 /* avoid busy loop if server is down */
1095 static void set_stat_task_restart_barrier(unsigned seconds)
1096 {
1097         struct timeval delay = {seconds, 0};
1098         tv_add(now, &delay, &stat_task->restart_barrier);
1099 }
1100
1101 static bool must_close_slot(int slot_num)
1102 {
1103         struct slot_info *s = &slot[slot_num];
1104         struct audio_format_info *a = afi + s->format;
1105         int i;
1106
1107         if (s->format < 0)
1108                 return false;
1109         if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1110                 return false;
1111         for (i = 0; i < a->num_filters; i++)
1112                 if (s->fns && task_status(s->fns[i].task) >= 0)
1113                         return false;
1114         if (a->num_writers > 0) {
1115                 for (i = 0; i < a->num_writers; i++)
1116                         if (s->wns && task_status(s->wns[i].task) >= 0)
1117                                 return false;
1118         } else {
1119                 if (s->wns && task_status(s->wns[0].task) >= 0)
1120                         return false;
1121         }
1122         return true;
1123 }
1124
1125 static void close_slot(int slot_num)
1126 {
1127         struct slot_info *s = slot + slot_num;
1128
1129         PARA_INFO_LOG("closing slot %d\n", slot_num);
1130         close_writers(s);
1131         close_filters(s);
1132         close_receiver(slot_num);
1133         clear_slot(slot_num);
1134 }
1135
1136 static void close_unused_slots(void)
1137 {
1138         int i;
1139
1140         FOR_EACH_SLOT(i)
1141                 if (must_close_slot(i))
1142                         close_slot(i);
1143 }
1144
1145 /*
1146  * Cleanup all resources.
1147  *
1148  * This performs various cleanups, removes the audiod socket and closes the
1149  * connection to para_server.
1150  */
1151 static void audiod_cleanup(void)
1152 {
1153         if (socket_name)
1154                 unlink(socket_name);
1155         close_stat_pipe();
1156         close_unused_slots();
1157         audiod_cmdline_parser_free(&conf);
1158         close_stat_clients();
1159 }
1160
1161 /*
1162  * Check if any receivers/filters/writers need to be started and do so if
1163  * necessary.
1164  */
1165 static void start_stop_decoders(void)
1166 {
1167         int ret;
1168         struct slot_info *sl;
1169
1170         close_unused_slots();
1171         if (audiod_status != AUDIOD_ON ||
1172                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1173                 return notify_receivers(E_NOT_PLAYING);
1174         if (!must_start_decoder())
1175                 return;
1176         ret = open_receiver(stat_task->current_audio_format_num);
1177         if (ret < 0) {
1178                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1179                 return;
1180         }
1181         sl = slot + ret;
1182         open_filters(sl);
1183         open_writers(sl);
1184         activate_grab_clients(&sched);
1185         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1186 }
1187
1188 static void status_pre_select(struct sched *s, void *context)
1189 {
1190         struct status_task *st = context;
1191         int i, ret, cafn = stat_task->current_audio_format_num;
1192
1193         if (must_start_decoder())
1194                 goto min_delay;
1195         FOR_EACH_SLOT(i)
1196                 if (must_close_slot(i))
1197                         goto min_delay;
1198         ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1199         if (ret > 0)
1200                 goto min_delay;
1201         if (st->ct && audiod_status == AUDIOD_OFF)
1202                 goto min_delay;
1203         if (!st->ct && audiod_status != AUDIOD_OFF)
1204                 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1205         if (cafn >= 0)
1206                 sched_request_barrier(&afi[cafn].restart_barrier, s);
1207         /*
1208          * If para_server is playing we'd like to have a smooth time display
1209          * even if we are running in standby mode. So we request a timeout that
1210          * expires at the next full second.
1211          */
1212         if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1213                 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1214         return;
1215 min_delay:
1216         sched_min_delay(s);
1217 }
1218
1219 /* restart the client task if necessary */
1220 static int status_post_select(struct sched *s, void *context)
1221 {
1222         struct status_task *st = context;
1223         int ret;
1224
1225         ret = task_get_notification(st->task);
1226         if (ret < 0)
1227                 return ret;
1228         if (audiod_status == AUDIOD_OFF) {
1229                 if (!st->ct)
1230                         goto out;
1231                 if (task_status(st->ct->task) >= 0) {
1232                         task_notify(st->ct->task, E_AUDIOD_OFF);
1233                         goto out;
1234                 }
1235                 close_stat_pipe();
1236                 st->clock_diff_count = conf.clock_diff_count_arg;
1237                 goto out;
1238         }
1239         if (st->ct) {
1240                 char *buf;
1241                 size_t sz;
1242
1243                 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1244                 if (ret < 0) {
1245                         close_stat_pipe();
1246                         goto out;
1247                 }
1248                 if (st->ct->status != CL_EXECUTING)
1249                         goto out;
1250                 if (ret == 0) {
1251                         struct timeval diff;
1252                         tv_diff(now, &st->last_status_read, &diff);
1253                         if (diff.tv_sec > 61)
1254                                 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1255                         goto out;
1256                 }
1257                 btr_merge(st->btrn, st->min_iqs);
1258                 sz = btr_next_buffer(st->btrn, &buf);
1259                 ret = for_each_stat_item(buf, sz, update_item);
1260                 if (ret < 0) {
1261                         task_notify(st->ct->task, -ret);
1262                         goto out;
1263                 }
1264                 if (sz != ret) {
1265                         btr_consume(st->btrn, sz - ret);
1266                         st->last_status_read = *now;
1267                         st->min_iqs = 0;
1268                 } else /* current status item crosses buffers */
1269                         st->min_iqs = sz + 1;
1270                 goto out;
1271         }
1272         btr_drain(st->btrn);
1273         st->current_audio_format_num = -1;
1274         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1275                 goto out;
1276         if (st->clock_diff_count) { /* get status only one time */
1277                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1278                 int argc = 5;
1279                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1280                 st->clock_diff_count--;
1281                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1282                 set_stat_task_restart_barrier(2);
1283
1284         } else {
1285                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1286                 int argc = 4;
1287                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1288                 set_stat_task_restart_barrier(5);
1289         }
1290         free(stat_item_values[SI_BASENAME]);
1291         stat_item_values[SI_BASENAME] = para_strdup(
1292                 "no connection to para_server");
1293         stat_client_write_item(SI_BASENAME);
1294         st->last_status_read = *now;
1295 out:
1296         start_stop_decoders();
1297         return 0;
1298 }
1299
1300 static void init_status_task(struct status_task *st)
1301 {
1302         memset(st, 0, sizeof(struct status_task));
1303         st->sa_time_diff_sign = 1;
1304         st->clock_diff_count = conf.clock_diff_count_arg;
1305         st->current_audio_format_num = -1;
1306         st->btrn = btr_new_node(&(struct btr_node_description)
1307                 EMBRACE(.name = "stat"));
1308
1309         stat_task->task = task_register(&(struct task_info) {
1310                 .name = "stat",
1311                 .pre_select = status_pre_select,
1312                 .post_select = status_post_select,
1313                 .context = stat_task,
1314         }, &sched);
1315 }
1316
1317 static void set_initial_status(void)
1318 {
1319         audiod_status = AUDIOD_ON;
1320         if (!conf.mode_given)
1321                 return;
1322         if (!strcmp(conf.mode_arg, "sb")) {
1323                 audiod_status = AUDIOD_STANDBY;
1324                 return;
1325         }
1326         if (!strcmp(conf.mode_arg, "off")) {
1327                 audiod_status = AUDIOD_OFF;
1328                 return;
1329         }
1330         if (strcmp(conf.mode_arg, "on"))
1331                 PARA_WARNING_LOG("invalid mode\n");
1332 }
1333
1334 __noreturn static void print_help_and_die(void)
1335 {
1336         struct ggo_help h = DEFINE_GGO_HELP(audiod);
1337         bool d = conf.detailed_help_given;
1338         unsigned flags;
1339
1340         flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1341         ggo_print_help(&h, flags);
1342
1343         flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1344         print_receiver_helps(flags);
1345         print_filter_helps(flags);
1346         print_writer_helps(flags);
1347         exit(0);
1348 }
1349
1350 /**
1351  * the main function of para_audiod
1352  *
1353  * \param argc usual argument count
1354  * \param argv usual argument vector
1355  *
1356  * \return EXIT_SUCCESS or EXIT_FAILURE
1357  *
1358  * \sa para_audiod(1)
1359  * */
1360 int main(int argc, char *argv[])
1361 {
1362         int ret, i;
1363         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1364         struct audiod_cmdline_parser_params params = {
1365                 .override = 0,
1366                 .initialize = 1,
1367                 .check_required = 0,
1368                 .check_ambiguity = 0,
1369                 .print_errors = 1
1370         };
1371
1372         valid_fd_012();
1373         audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1374         daemon_set_loglevel(conf.loglevel_arg);
1375         version_handle_flag("audiod", conf.version_given);
1376         /* init receivers/filters/writers early to make help work */
1377         recv_init();
1378         filter_init();
1379         writer_init();
1380         if (conf.help_given || conf.detailed_help_given)
1381                 print_help_and_die();
1382         daemon_drop_privileges_or_die(conf.user_arg, conf.group_arg);
1383         parse_config_or_die();
1384         daemon_init_colors_or_die(conf.color_arg, color_arg_auto, color_arg_no,
1385                 conf.logfile_given, conf.log_color_arg, conf.log_color_given);
1386         init_random_seed_or_die();
1387         daemon_set_flag(DF_LOG_TIME);
1388         daemon_set_flag(DF_LOG_HOSTNAME);
1389         daemon_set_flag(DF_LOG_LL);
1390         if (conf.log_timing_given)
1391                 daemon_set_flag(DF_LOG_TIMING);
1392         if (conf.logfile_given) {
1393                 daemon_set_logfile(conf.logfile_arg);
1394                 daemon_open_log_or_die();
1395         }
1396         ret = parse_stream_args();
1397         if (ret < 0) {
1398                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1399                 exit(EXIT_FAILURE);
1400         }
1401         daemon_log_welcome("para_audiod");
1402         daemon_set_start_time();
1403         set_initial_status();
1404         FOR_EACH_SLOT(i)
1405                 clear_slot(i);
1406         setup_signal_handling();
1407
1408         init_status_task(stat_task);
1409         init_command_task(cmd_task);
1410
1411         if (conf.daemon_given)
1412                 daemonize(false /* parent exits immediately */);
1413
1414         signal_task->task = task_register(&(struct task_info) {
1415                 .name = "signal",
1416                 .pre_select = signal_pre_select,
1417                 .post_select = signal_post_select,
1418                 .context = signal_task,
1419         }, &sched);
1420
1421         sched.default_timeout.tv_sec = 2;
1422         sched.default_timeout.tv_usec = 999 * 1000;
1423         ret = schedule(&sched);
1424         audiod_cleanup();
1425         sched_shutdown(&sched);
1426         signal_shutdown(signal_task);
1427
1428         if (ret < 0)
1429                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1430         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
1431 }