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 static int get_play_time_slot_num(void)
 218 {
 219         int i, oldest_slot = -1;
 220         struct timeval oldest_wstime = {0, 0};
 221
 222         FOR_EACH_SLOT(i) {
 223                 struct slot_info *s = &slot[i];
 224                 struct timeval wstime;
 225                 if (!s->wns || !s->wns[0].btrn)
 226                         continue;
 227                 btr_get_node_start(s->wns[0].btrn, &wstime);
 228                 if (oldest_slot >= 0 && tv_diff(&wstime, &oldest_wstime, NULL) > 0)
 229                         continue;
 230                 oldest_wstime = wstime;
 231                 oldest_slot = i;
 232         }
 233         return oldest_slot;
 234 }
 235
 236 /**
 237  * Compute the play time based on information of the current slot.
 238  *
 239  * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
 240  * from the status items received from para_server and the start time of the
 241  * (first) writer of the current slot.
 242  *
 243  * It has to take into account that the stream was probably not started at
 244  * the beginning of the file, that the clock between the server and the client
 245  * host may differ and that playback of the stream was delayed, e.g. because
 246  * the prebuffer filter is used in the filter configuration.
 247  *
 248  * If no writer is active, for example because para_audiod runs in standby
 249  * mode, an approximation based only on the status items is computed and the
 250  * returned string is prefixed with "~".
 251  *
 252  * \return A string that must be freed by the caller.
 253  */
 254 char *get_time_string(void)
 255 {
 256         int ret, seconds = 0, length;
 257         struct timeval *tmp, sum, sss, /* server stream start */
 258                 rstime, /* receiver start time */
 259                 wstime, /* writer start time */
 260                 wtime, /* now - writer start */
 261                 rskip; /* receiver start - sss */
 262         int slot_num = get_play_time_slot_num();
 263         struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
 264         char *msg;
 265
 266         if (audiod_status == AUDIOD_OFF)
 267                 goto empty;
 268         if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
 269                 if (stat_task->length_seconds) /* paused */
 270                         return NULL;
 271                 goto empty; /* stopped */
 272         }
 273         if (audiod_status == AUDIOD_ON && !s)
 274                 goto empty;
 275         /*
 276          * Valid status items and playing, set length and tmp to the stream
 277          * start. We use the slot info and fall back to the info from current
 278          * status items if no slot info is available.
 279          */
 280         length = stat_task->length_seconds;
 281         tmp = &stat_task->server_stream_start;
 282         if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
 283                 btr_get_node_start(s->wns[0].btrn, &wstime);
 284                 if (wstime.tv_sec != 0) { /* writer wrote something */
 285                         if (s->server_stream_start.tv_sec == 0) {
 286                                 /* copy status info to slot */
 287                                 s->server_stream_start = stat_task->server_stream_start;
 288                                 s->offset_seconds = stat_task->offset_seconds;
 289                                 s->seconds_total = stat_task->length_seconds;
 290                         }
 291                         length = s->seconds_total;
 292                         tmp = &s->server_stream_start;
 293                 }
 294         }
 295         if (stat_task->sa_time_diff_sign > 0)
 296                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
 297         else
 298                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
 299         if (!s || !s->wns || !s->wns[0].btrn) {
 300                 struct timeval diff;
 301                 tv_diff(now, &sss, &diff);
 302                 seconds = diff.tv_sec + stat_task->offset_seconds;
 303                 goto out;
 304         }
 305         tv_diff(now, &wstime, &wtime);
 306         //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
 307         seconds = s->offset_seconds;
 308         if (s->receiver_node->btrn) {
 309                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 310                 ret = tv_diff(&rstime, &sss, &rskip);
 311                 if (ret > 0) { /* audiod was started in the middle of the stream */
 312                         tv_add(&wtime, &rskip, &sum);
 313                         seconds += sum.tv_sec;
 314                 } else
 315                         seconds += wtime.tv_sec;
 316         } else
 317                 seconds += wtime.tv_sec;
 318 out:
 319         seconds = PARA_MIN(seconds, length);
 320         seconds = PARA_MAX(seconds, 0);
 321         msg = make_message(
 322                 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
 323                 s? "" : "~",
 324                 seconds / 60,
 325                 seconds % 60,
 326                 (length - seconds) / 60,
 327                 (length - seconds) % 60,
 328                 length? (seconds * 100 + length / 2) / length : 0,
 329                 length / 60,
 330                 length % 60
 331         );
 332         //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
 333         return msg;
 334 empty:
 335         return para_strdup(NULL);
 336 }
 337
 338 static void parse_config_or_die(void)
 339 {
 340         int ret;
 341         char *config_file;
 342         struct audiod_cmdline_parser_params params = {
 343                 .override = 0,
 344                 .initialize = 0,
 345                 .check_required = 1,
 346                 .check_ambiguity = 0,
 347                 .print_errors = 1
 348         };
 349
 350         if (conf.config_file_given)
 351                 config_file = para_strdup(conf.config_file_arg);
 352         else {
 353                 char *home = para_homedir();
 354                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 355                 free(home);
 356         }
 357         ret = file_exists(config_file);
 358         if (conf.config_file_given && !ret) {
 359                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 360                 goto err;
 361         }
 362         if (ret) {
 363                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 364                 daemon_set_loglevel(conf.loglevel_arg);
 365         }
 366         free(config_file);
 367         return;
 368 err:
 369         free(config_file);
 370         exit(EXIT_FAILURE);
 371 }
 372
 373 static void setup_signal_handling(void)
 374 {
 375         signal_task = signal_init_or_die();
 376         para_install_sighandler(SIGINT);
 377         para_install_sighandler(SIGTERM);
 378         para_install_sighandler(SIGHUP);
 379         para_sigaction(SIGPIPE, SIG_IGN);
 380 }
 381
 382 static void clear_slot(int slot_num)
 383 {
 384         struct slot_info *s = &slot[slot_num];
 385
 386         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 387         memset(s, 0, sizeof(struct slot_info));
 388         s->format = -1;
 389 }
 390
 391 static void close_receiver(int slot_num)
 392 {
 393         struct slot_info *s = &slot[slot_num];
 394         struct audio_format_info *a;
 395
 396         if (s->format < 0 || !s->receiver_node)
 397                 return;
 398         a = &afi[s->format];
 399         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 400                 audio_formats[s->format], slot_num);
 401         a->receiver->close(s->receiver_node);
 402         btr_remove_node(&s->receiver_node->btrn);
 403         task_reap(&s->receiver_node->task);
 404         free(s->receiver_node);
 405         s->receiver_node = NULL;
 406         stat_task->current_audio_format_num = -1;
 407         tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
 408                 &a->restart_barrier);
 409 }
 410
 411 static void writer_cleanup(struct writer_node *wn)
 412 {
 413         struct writer *w;
 414
 415         if (!wn)
 416                 return;
 417         w = writers + wn->writer_num;
 418         PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
 419         w->close(wn);
 420         btr_remove_node(&wn->btrn);
 421         task_reap(&wn->task);
 422 }
 423
 424 static void close_writers(struct slot_info *s)
 425 {
 426         struct audio_format_info *a;
 427         int i;
 428
 429         if (s->format < 0)
 430                 return;
 431         assert(s->wns);
 432         a = afi + s->format;
 433         if (a->num_writers == 0)
 434                 writer_cleanup(s->wns);
 435         else {
 436                 for (i = 0; i < a->num_writers; i++)
 437                         writer_cleanup(s->wns + i);
 438         }
 439         free(s->wns);
 440         s->wns = NULL;
 441 }
 442
 443 static void close_filters(struct slot_info *s)
 444 {
 445         int i;
 446         struct audio_format_info *a = afi + s->format;
 447         if (a->num_filters == 0)
 448                 return;
 449         for (i = a->num_filters - 1; i >= 0; i--) {
 450                 struct filter_node *fn = s->fns + i;
 451                 struct filter *f;
 452
 453                 if (!fn)
 454                         continue;
 455                 f = filters + fn->filter_num;
 456                 if (f->close)
 457                         f->close(fn);
 458                 btr_remove_node(&fn->btrn);
 459                 task_reap(&fn->task);
 460         }
 461         free(s->fns);
 462         s->fns = NULL;
 463 }
 464
 465 static void notify_receivers(int error)
 466 {
 467         int i;
 468
 469         FOR_EACH_SLOT(i) {
 470                 struct slot_info *s = slot + i;
 471                 if (s->format < 0)
 472                         continue;
 473                 if (!s->receiver_node)
 474                         continue;
 475                 task_notify(s->receiver_node->task, error);
 476         }
 477 }
 478
 479 static int get_empty_slot(void)
 480 {
 481         int i;
 482         struct slot_info *s;
 483
 484         FOR_EACH_SLOT(i) {
 485                 s = &slot[i];
 486                 if (s->format < 0) {
 487                         clear_slot(i);
 488                         return i;
 489                 }
 490                 if (s->wns || s->receiver_node || s->fns)
 491                         continue;
 492                 clear_slot(i);
 493                 return i;
 494         }
 495         return -E_NO_MORE_SLOTS;
 496 }
 497
 498 static void open_filters(struct slot_info *s)
 499 {
 500         struct audio_format_info *a = afi + s->format;
 501         struct filter_node *fn;
 502         int nf = a->num_filters;
 503         struct btr_node *parent;
 504         int i;
 505
 506         if (nf == 0)
 507                 return;
 508         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 509         assert(s->fns == NULL);
 510         s->fns = para_calloc(nf * sizeof(struct filter_node));
 511         parent = s->receiver_node->btrn;
 512         for (i = 0; i < nf; i++) {
 513                 char buf[20];
 514                 struct filter *f = filters + a->filter_nums[i];
 515                 fn = s->fns + i;
 516                 fn->filter_num = a->filter_nums[i];
 517                 fn->conf = a->filter_conf[i];
 518                 fn->btrn = btr_new_node(&(struct btr_node_description)
 519                         EMBRACE(.name = f->name, .parent = parent,
 520                                 .handler = f->execute, .context = fn));
 521
 522                 f->open(fn);
 523                 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
 524                 fn->task = task_register(&(struct task_info) {
 525                         .name = buf,
 526                         .pre_select = f->pre_select,
 527                         .post_select = f->post_select,
 528                         .context = fn,
 529                 }, &sched);
 530                 parent = fn->btrn;
 531                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 532                         audio_formats[s->format], i,  nf, f->name, (int)(s - slot));
 533         }
 534 }
 535
 536 static void open_writers(struct slot_info *s)
 537 {
 538         int i;
 539         struct audio_format_info *a = afi + s->format;
 540         struct writer_node *wn;
 541         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 542
 543         assert(s->wns == NULL);
 544         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 545                 * sizeof(struct writer_node));
 546         for (i = 0; i < a->num_writers; i++) {
 547                 wn = s->wns + i;
 548                 wn->conf = a->writer_conf[i];
 549                 wn->writer_num = a->writer_nums[i];
 550                 register_writer_node(wn, parent, &sched);
 551                 PARA_NOTICE_LOG("%s writer started in slot %d\n",
 552                         writer_names[a->writer_nums[i]], (int)(s - slot));
 553         }
 554 }
 555
 556 /* returns slot num on success */
 557 static int open_receiver(int format)
 558 {
 559         struct audio_format_info *a = &afi[format];
 560         struct slot_info *s;
 561         int ret, slot_num;
 562         struct receiver *r = a->receiver;
 563         struct receiver_node *rn;
 564
 565         tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
 566         ret = get_empty_slot();
 567         if (ret < 0)
 568                 return ret;
 569         slot_num = ret;
 570         rn = para_calloc(sizeof(*rn));
 571         rn->receiver = r;
 572         rn->conf = a->receiver_conf;
 573         rn->btrn = btr_new_node(&(struct btr_node_description)
 574                 EMBRACE(.name = r->name, .context = rn));
 575         ret = r->open(rn);
 576         if (ret < 0) {
 577                 btr_remove_node(&rn->btrn);
 578                 free(rn);
 579                 return ret;
 580         }
 581         s = &slot[slot_num];
 582         s->format = format;
 583         s->receiver_node = rn;
 584         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 585                 audio_formats[format], r->name, slot_num);
 586         rn->task = task_register(&(struct task_info) {
 587                 .name = r->name,
 588                 .pre_select = r->pre_select,
 589                 .post_select = r->post_select,
 590                 .context = rn,
 591         }, &sched);
 592         return slot_num;
 593 }
 594
 595 static bool receiver_running(void)
 596 {
 597         int i;
 598         long unsigned ss1 = stat_task->server_stream_start.tv_sec;
 599
 600         FOR_EACH_SLOT(i) {
 601                 struct slot_info *s = &slot[i];
 602                 long unsigned ss2 = s->server_stream_start.tv_sec;
 603
 604                 if (!s->receiver_node)
 605                         continue;
 606                 if (task_status(s->receiver_node->task) >= 0)
 607                         return true;
 608                 if (ss1 == ss2)
 609                         return true;
 610         }
 611         return false;
 612 }
 613
 614 /**
 615  * Return the root node of the current buffer tree.
 616  *
 617  * This is only used for stream grabbing.
 618  *
 619  * \return \p NULL if no slot is currently active. If more than one buffer tree
 620  * exists, the node corresponding to the most recently started receiver is
 621  * returned.
 622  */
 623 struct btr_node *audiod_get_btr_root(void)
 624 {
 625         int i, newest_slot = -1;
 626         struct timeval newest_rstime = {0, 0};
 627
 628         FOR_EACH_SLOT(i) {
 629                 struct slot_info *s = &slot[i];
 630                 struct timeval rstime;
 631                 if (!s->receiver_node)
 632                         continue;
 633                 if (task_status(s->receiver_node->task) < 0)
 634                         continue;
 635                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 636                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 637                         continue;
 638                 newest_rstime = rstime;
 639                 newest_slot = i;
 640         }
 641         if (newest_slot == -1)
 642                 return NULL;
 643         return slot[newest_slot].receiver_node->btrn;
 644 }
 645
 646 /* whether a new instance of a decoder should be started. */
 647 static bool must_start_decoder(void)
 648 {
 649         int cafn = stat_task->current_audio_format_num;
 650         unsigned vs = stat_task->vss_status;
 651
 652         if (audiod_status != AUDIOD_ON)
 653                 return false;
 654         if (cafn < 0)
 655                 return false;
 656         if (!stat_task->ct)
 657                 return false;
 658         if (vs & VSS_STATUS_FLAG_NEXT)
 659                 return false;
 660         if (!(vs & VSS_STATUS_FLAG_PLAYING))
 661                 return false;
 662         if (receiver_running())
 663                 return false;
 664         if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
 665                 return false;
 666         return true;
 667 }
 668
 669 static void compute_time_diff(const struct timeval *status_time)
 670 {
 671         struct timeval tmp, diff;
 672         static unsigned count;
 673         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 674         const struct timeval max_deviation = {0, 500 * 1000};
 675         const int time_smooth = 5;
 676
 677         sign = tv_diff(status_time, now, &diff);
 678 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 679 //                      sign, sa_time_diff_sign);
 680         if (!count) {
 681                 sa_time_diff_sign = sign;
 682                 stat_task->sa_time_diff = diff;
 683                 count++;
 684                 goto out;
 685         }
 686         if (count > 5) {
 687                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 688                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 689                         PARA_WARNING_LOG("time diff jump: %lims\n",
 690                                 s * tv2ms(&tmp));
 691         }
 692         count++;
 693         sa_time_diff_sign = tv_convex_combination(
 694                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 695                 count > 10? sign : sign * time_smooth, &diff,
 696                 &tmp);
 697         stat_task->sa_time_diff = tmp;
 698         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 699                 sign < 0? "-" : "+",
 700                 tv2ms(&diff),
 701                 sa_time_diff_sign < 0? "-" : "+",
 702                 tv2ms(&stat_task->sa_time_diff)
 703         );
 704 out:
 705         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 706 }
 707
 708 static int update_item(int itemnum, char *buf)
 709 {
 710         long unsigned sec, usec;
 711
 712         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 713                 return 1;
 714         free(stat_item_values[itemnum]);
 715         stat_item_values[itemnum] = para_strdup(buf);
 716         stat_client_write_item(itemnum);
 717         switch (itemnum) {
 718         case SI_STATUS_FLAGS:
 719                 stat_task->vss_status = 0;
 720                 if (strchr(buf, 'N'))
 721                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 722                 if (strchr(buf, 'P'))
 723                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 724                 break;
 725         case SI_OFFSET:
 726                 stat_task->offset_seconds = atoi(buf);
 727                 break;
 728         case SI_SECONDS_TOTAL:
 729                 stat_task->length_seconds = atoi(buf);
 730                 break;
 731         case SI_STREAM_START:
 732                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 733                         stat_task->server_stream_start.tv_sec = sec;
 734                         stat_task->server_stream_start.tv_usec = usec;
 735                 }
 736                 break;
 737         case SI_CURRENT_TIME:
 738                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 739                         struct timeval tv = {sec, usec};
 740                         compute_time_diff(&tv);
 741                 }
 742                 break;
 743         case SI_FORMAT:
 744                 stat_task->current_audio_format_num
 745                         = get_audio_format_num(buf);
 746         }
 747         return 1;
 748 }
 749
 750 static int parse_stream_command(const char *txt, char **cmd)
 751 {
 752         int ret, len;
 753         char *re, *p = strchr(txt, ':');
 754
 755         if (!p)
 756                 return -E_MISSING_COLON;
 757         *cmd = p + 1;
 758         len = p - txt;
 759         re = malloc(len + 1);
 760         strncpy(re, txt, len);
 761         re[len] = '\0';
 762         ret = get_matching_audio_format_nums(re);
 763         free(re);
 764         return ret;
 765 }
 766
 767 static int add_filter(int format, char *cmdline)
 768 {
 769         struct audio_format_info *a = &afi[format];
 770         int filter_num, nf = a->num_filters;
 771         void *cfg;
 772
 773         filter_num = check_filter_arg(cmdline, &cfg);
 774         if (filter_num < 0)
 775                 return filter_num;
 776         a->filter_conf = para_realloc(a->filter_conf,
 777                 (nf + 1) * sizeof(void *));
 778         a->filter_nums = para_realloc(a->filter_nums,
 779                 (nf + 1) * sizeof(unsigned));
 780         a->filter_nums[nf] = filter_num;
 781         a->filter_conf[nf] = cfg;
 782         a->num_filters++;
 783         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 784                 filters[filter_num].name);
 785         return filter_num;
 786 }
 787
 788 static int parse_writer_args(void)
 789 {
 790         int i, ret;
 791         char *cmd;
 792         struct audio_format_info *a;
 793
 794         for (i = 0; i < conf.writer_given; i++) {
 795                 void *wconf;
 796                 int j, nw, writer_num, af_mask;
 797
 798                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 799                 if (ret < 0)
 800                         return ret;
 801                 af_mask = ret;
 802                 FOR_EACH_AUDIO_FORMAT(j) {
 803                         a = afi + j;
 804                         if ((af_mask & (1 << j)) == 0) /* no match */
 805                                 continue;
 806                         wconf = check_writer_arg_or_die(cmd, &writer_num);
 807                         nw = a->num_writers;
 808                         a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
 809                         a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
 810                         a->writer_nums[nw] = writer_num;
 811                         a->writer_conf[nw] = wconf;
 812                         PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
 813                                 nw, writer_names[writer_num]);
 814                         a->num_writers++;
 815                 }
 816         }
 817         /* Use default writer for audio formats which are not yet set up. */
 818         FOR_EACH_AUDIO_FORMAT(i) {
 819                 void *writer_conf;
 820                 int writer_num;
 821                 a = afi + i;
 822                 if (a->num_writers > 0)
 823                         continue; /* already set up */
 824                 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
 825                 a->writer_nums = para_malloc(sizeof(int));
 826                 a->writer_nums[0] = writer_num;
 827                 a->writer_conf = para_malloc(sizeof(void *));
 828                 a->writer_conf[0] = writer_conf;
 829                 a->num_writers = 1;
 830                 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
 831                         writer_names[writer_num]);
 832         }
 833         return 1;
 834 }
 835
 836 static int parse_receiver_args(void)
 837 {
 838         int i, ret, receiver_num;
 839         char *cmd = NULL;
 840         struct audio_format_info *a;
 841
 842         for (i = conf.receiver_given - 1; i >= 0; i--) {
 843                 char *arg;
 844                 int j, af_mask;
 845
 846                 ret = parse_stream_command(conf.receiver_arg[i], &arg);
 847                 if (ret < 0)
 848                         goto out;
 849                 af_mask = ret;
 850                 FOR_EACH_AUDIO_FORMAT(j) {
 851                         a = afi + j;
 852                         if ((af_mask & (1 << j)) == 0) /* no match */
 853                                 continue;
 854                         /*
 855                          * If multiple receivers are given for this audio format, the
 856                          * last one wins and we have to free the previous receiver
 857                          * config here. Since we are iterating backwards, the winning
 858                          * receiver arg is in fact the first one given.
 859                          */
 860                         if (a->receiver_conf)
 861                                 a->receiver->free_config(a->receiver_conf);
 862                         a->receiver_conf = check_receiver_arg(arg, &receiver_num);
 863                         ret = -E_RECV_SYNTAX;
 864                         if (!a->receiver_conf)
 865                                 goto out;
 866                         a->receiver = receivers + receiver_num;
 867                 }
 868         }
 869         /*
 870          * Use the first available receiver with no arguments for those audio
 871          * formats for which no receiver was specified.
 872          */
 873         cmd = para_strdup(receivers[0].name);
 874         FOR_EACH_AUDIO_FORMAT(i) {
 875                 a = &afi[i];
 876                 if (a->receiver_conf)
 877                         continue;
 878                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 879                 if (!a->receiver_conf)
 880                         return -E_RECV_SYNTAX;
 881                 a->receiver = &receivers[receiver_num];
 882         }
 883         FOR_EACH_AUDIO_FORMAT(i) {
 884                 a = afi + i;
 885                 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
 886                         audio_formats[i], a->receiver->name);
 887         }
 888         ret = 1;
 889 out:
 890         free(cmd);
 891         return ret;
 892 }
 893
 894 static int init_default_filters(void)
 895 {
 896         int i, ret = 1;
 897
 898         FOR_EACH_AUDIO_FORMAT(i) {
 899                 struct audio_format_info *a = &afi[i];
 900                 char *tmp;
 901                 int j;
 902
 903                 if (a->num_filters)
 904                         continue; /* no default -- nothing to to */
 905                 /*
 906                  * udp and dccp streams are fec-encoded, so add fecdec as the
 907                  * first filter.
 908                  */
 909                 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
 910                                 strcmp(afi[i].receiver->name, "dccp") == 0) {
 911                         tmp = para_strdup("fecdec");
 912                         add_filter(i, tmp);
 913                         free(tmp);
 914                         if (ret < 0)
 915                                 goto out;
 916                 }
 917                 /* add "dec" to audio format name */
 918                 tmp = make_message("%sdec", audio_formats[i]);
 919                 for (j = 0; filters[j].name; j++)
 920                         if (!strcmp(tmp, filters[j].name))
 921                                 break;
 922                 free(tmp);
 923                 ret = -E_UNSUPPORTED_FILTER;
 924                 if (!filters[j].name)
 925                         goto out;
 926                 tmp = para_strdup(filters[j].name);
 927                 ret = add_filter(i, tmp);
 928                 free(tmp);
 929                 if (ret < 0)
 930                         goto out;
 931                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 932                         filters[j].name);
 933         }
 934 out:
 935         return ret;
 936 }
 937
 938 static int parse_filter_args(void)
 939 {
 940         int i, j, ret, af_mask, num_matches;
 941
 942         for (i = 0; i < conf.filter_given; i++) {
 943                 char *arg;
 944                 ret = parse_stream_command(conf.filter_arg[i], &arg);
 945                 if (ret < 0)
 946                         goto out;
 947                 af_mask = ret;
 948                 num_matches = 0;
 949                 FOR_EACH_AUDIO_FORMAT(j) {
 950                         if ((af_mask & (1 << j)) == 0) /* no match */
 951                                 continue;
 952                         ret = add_filter(j, arg);
 953                         if (ret < 0)
 954                                 goto out;
 955                         num_matches++;
 956                 }
 957                 if (num_matches == 0)
 958                         PARA_WARNING_LOG("ignoring filter spec: %s\n",
 959                                 conf.filter_arg[i]);
 960         }
 961         ret = init_default_filters(); /* use default values for the rest */
 962 out:
 963         return ret;
 964 }
 965
 966 static int parse_stream_args(void)
 967 {
 968         int ret;
 969
 970         ret = parse_receiver_args();
 971         if (ret < 0)
 972                 return ret;
 973         ret = parse_filter_args();
 974         if (ret < 0)
 975                 return ret;
 976         ret = parse_writer_args();
 977         if (ret < 0)
 978                 return ret;
 979         return 1;
 980 }
 981
 982 /* does not unlink socket on errors */
 983 static void init_local_sockets(struct command_task *ct)
 984 {
 985         if (conf.socket_given)
 986                 socket_name = para_strdup(conf.socket_arg);
 987         else {
 988                 char *hn = para_hostname();
 989                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 990                         hn);
 991                 free(hn);
 992         }
 993         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 994         if (conf.force_given)
 995                 unlink(socket_name);
 996         ct->fd[0] = create_local_socket(socket_name, 0);
 997         ct->fd[1] = create_local_socket(socket_name,
 998                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 999         if (ct->fd[0] >= 0 || ct->fd[1] >= 0)
1000                 return;
1001         PARA_EMERG_LOG("%s\n", para_strerror(-ct->fd[1]));
1002         exit(EXIT_FAILURE);
1003 }
1004
1005 static int signal_post_select(struct sched *s, void *context)
1006 {
1007         struct signal_task *st = context;
1008         int ret, signum;
1009
1010         ret = task_get_notification(st->task);
1011         if (ret < 0)
1012                 return ret;
1013         signum = para_next_signal(&s->rfds);
1014         switch (signum) {
1015         case SIGINT:
1016         case SIGTERM:
1017         case SIGHUP:
1018                 PARA_NOTICE_LOG("received signal %d\n", signum);
1019                 task_notify_all(s, E_AUDIOD_SIGNAL);
1020                 return -E_AUDIOD_SIGNAL;
1021         }
1022         return 0;
1023 }
1024
1025 static void command_pre_select(struct sched *s, void *context)
1026 {
1027         struct command_task *ct = context;
1028         int i;
1029
1030         for (i = 0; i < 2; i++)
1031                 if (ct->fd[i] >= 0)
1032                         para_fd_set(ct->fd[i], &s->rfds, &s->max_fileno);
1033 }
1034
1035 static int command_post_select(struct sched *s, void *context)
1036 {
1037         int ret, i;
1038         struct command_task *ct = context;
1039         static struct timeval last_status_dump;
1040         struct timeval tmp, delay;
1041         bool force = false;
1042
1043         ret = task_get_notification(ct->task);
1044         if (ret < 0)
1045                 return ret;
1046         for (i = 0; i < 2; i++) {
1047                 if (ct->fd[i] < 0)
1048                         continue;
1049                 ret = handle_connect(ct->fd[i], &s->rfds);
1050                 if (ret < 0) {
1051                         PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1052                         if (ret == -E_AUDIOD_TERM) {
1053                                 task_notify_all(s, -ret);
1054                                 return ret;
1055                         }
1056                 } else if (ret > 0)
1057                         force = true;
1058         }
1059         if (force == true)
1060                 goto dump;
1061
1062         /* if last status dump was less than 500ms ago, do nothing */
1063         delay.tv_sec = 0;
1064         delay.tv_usec = 500 * 1000;
1065         tv_add(&last_status_dump, &delay, &tmp);
1066         if (tv_diff(now, &tmp, NULL) < 0)
1067                 return 0;
1068
1069         /*
1070          * If last status dump was more than 5s ago, force update. Otherwise,
1071          * update only those items that have changed.
1072          */
1073         delay.tv_sec = 5;
1074         delay.tv_usec = 0;
1075         tv_add(&last_status_dump, &delay, &tmp);
1076         if (tv_diff(now, &tmp, NULL) > 0)
1077                 force = true;
1078 dump:
1079         audiod_status_dump(force);
1080         last_status_dump = *now;
1081         return 1;
1082 }
1083
1084 static void init_command_task(struct command_task *ct)
1085 {
1086         init_local_sockets(ct); /* doesn't return on errors */
1087
1088         ct->task = task_register(&(struct task_info) {
1089                 .name = "command",
1090                 .pre_select = command_pre_select,
1091                 .post_select = command_post_select,
1092                 .context = ct,
1093         }, &sched);
1094 }
1095
1096 static void close_stat_pipe(void)
1097 {
1098         if (!stat_task->ct)
1099                 return;
1100         task_reap(&stat_task->ct->task);
1101         client_close(stat_task->ct);
1102         stat_task->ct = NULL;
1103         clear_and_dump_items();
1104         stat_task->length_seconds = 0;
1105         stat_task->offset_seconds = 0;
1106         stat_task->vss_status = 0;
1107         stat_task->current_audio_format_num = -1;
1108         audiod_status_dump(true);
1109 }
1110
1111 /* avoid busy loop if server is down */
1112 static void set_stat_task_restart_barrier(unsigned seconds)
1113 {
1114         struct timeval delay = {seconds, 0};
1115         tv_add(now, &delay, &stat_task->restart_barrier);
1116 }
1117
1118 static bool must_close_slot(int slot_num)
1119 {
1120         struct slot_info *s = &slot[slot_num];
1121         struct audio_format_info *a = afi + s->format;
1122         int i;
1123
1124         if (s->format < 0)
1125                 return false;
1126         if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1127                 return false;
1128         for (i = 0; i < a->num_filters; i++)
1129                 if (s->fns && task_status(s->fns[i].task) >= 0)
1130                         return false;
1131         if (a->num_writers > 0) {
1132                 for (i = 0; i < a->num_writers; i++)
1133                         if (s->wns && task_status(s->wns[i].task) >= 0)
1134                                 return false;
1135         } else {
1136                 if (s->wns && task_status(s->wns[0].task) >= 0)
1137                         return false;
1138         }
1139         return true;
1140 }
1141
1142 static void close_slot(int slot_num)
1143 {
1144         struct slot_info *s = slot + slot_num;
1145
1146         PARA_INFO_LOG("closing slot %d\n", slot_num);
1147         close_writers(s);
1148         close_filters(s);
1149         close_receiver(slot_num);
1150         clear_slot(slot_num);
1151 }
1152
1153 static void close_unused_slots(void)
1154 {
1155         int i;
1156
1157         FOR_EACH_SLOT(i)
1158                 if (must_close_slot(i))
1159                         close_slot(i);
1160 }
1161
1162 /*
1163  * Cleanup all resources.
1164  *
1165  * This performs various cleanups, removes the audiod socket and closes the
1166  * connection to para_server.
1167  */
1168 static void audiod_cleanup(void)
1169 {
1170         if (socket_name)
1171                 unlink(socket_name);
1172         close_stat_pipe();
1173         close_unused_slots();
1174         audiod_cmdline_parser_free(&conf);
1175         close_stat_clients();
1176 }
1177
1178 /*
1179  * Check if any receivers/filters/writers need to be started and do so if
1180  * necessary.
1181  */
1182 static void start_stop_decoders(void)
1183 {
1184         int ret;
1185         struct slot_info *sl;
1186
1187         close_unused_slots();
1188         if (audiod_status != AUDIOD_ON ||
1189                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1190                 return notify_receivers(E_NOT_PLAYING);
1191         if (!must_start_decoder())
1192                 return;
1193         ret = open_receiver(stat_task->current_audio_format_num);
1194         if (ret < 0) {
1195                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1196                 return;
1197         }
1198         sl = slot + ret;
1199         open_filters(sl);
1200         open_writers(sl);
1201         activate_grab_clients(&sched);
1202         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1203 }
1204
1205 static void status_pre_select(struct sched *s, void *context)
1206 {
1207         struct status_task *st = context;
1208         int i, ret, cafn = stat_task->current_audio_format_num;
1209
1210         if (must_start_decoder())
1211                 goto min_delay;
1212         FOR_EACH_SLOT(i)
1213                 if (must_close_slot(i))
1214                         goto min_delay;
1215         ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1216         if (ret > 0)
1217                 goto min_delay;
1218         if (st->ct && audiod_status == AUDIOD_OFF)
1219                 goto min_delay;
1220         if (!st->ct && audiod_status != AUDIOD_OFF)
1221                 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1222         if (cafn >= 0)
1223                 sched_request_barrier(&afi[cafn].restart_barrier, s);
1224         /*
1225          * If para_server is playing we'd like to have a smooth time display
1226          * even if we are running in standby mode. So we request a timeout that
1227          * expires at the next full second.
1228          */
1229         if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1230                 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1231         return;
1232 min_delay:
1233         sched_min_delay(s);
1234 }
1235
1236 /* restart the client task if necessary */
1237 static int status_post_select(struct sched *s, void *context)
1238 {
1239         struct status_task *st = context;
1240         int ret;
1241
1242         ret = task_get_notification(st->task);
1243         if (ret < 0)
1244                 return ret;
1245         if (audiod_status == AUDIOD_OFF) {
1246                 if (!st->ct)
1247                         goto out;
1248                 if (task_status(st->ct->task) >= 0) {
1249                         task_notify(st->ct->task, E_AUDIOD_OFF);
1250                         goto out;
1251                 }
1252                 close_stat_pipe();
1253                 st->clock_diff_count = conf.clock_diff_count_arg;
1254                 goto out;
1255         }
1256         if (st->ct) {
1257                 char *buf;
1258                 size_t sz;
1259
1260                 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1261                 if (ret < 0) {
1262                         close_stat_pipe();
1263                         goto out;
1264                 }
1265                 if (st->ct->status != CL_EXECUTING)
1266                         goto out;
1267                 if (ret == 0) {
1268                         struct timeval diff;
1269                         tv_diff(now, &st->last_status_read, &diff);
1270                         if (diff.tv_sec > 61)
1271                                 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1272                         goto out;
1273                 }
1274                 btr_merge(st->btrn, st->min_iqs);
1275                 sz = btr_next_buffer(st->btrn, &buf);
1276                 ret = for_each_stat_item(buf, sz, update_item);
1277                 if (ret < 0) {
1278                         task_notify(st->ct->task, -ret);
1279                         goto out;
1280                 }
1281                 if (sz != ret) {
1282                         btr_consume(st->btrn, sz - ret);
1283                         st->last_status_read = *now;
1284                         st->min_iqs = 0;
1285                 } else /* current status item crosses buffers */
1286                         st->min_iqs = sz + 1;
1287                 goto out;
1288         }
1289         btr_drain(st->btrn);
1290         st->current_audio_format_num = -1;
1291         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1292                 goto out;
1293         if (st->clock_diff_count) { /* get status only one time */
1294                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1295                 int argc = 5;
1296                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1297                 st->clock_diff_count--;
1298                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1299                 set_stat_task_restart_barrier(2);
1300
1301         } else {
1302                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1303                 int argc = 4;
1304                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1305                 set_stat_task_restart_barrier(5);
1306         }
1307         free(stat_item_values[SI_BASENAME]);
1308         stat_item_values[SI_BASENAME] = para_strdup(
1309                 "no connection to para_server");
1310         stat_client_write_item(SI_BASENAME);
1311         st->last_status_read = *now;
1312 out:
1313         start_stop_decoders();
1314         return 0;
1315 }
1316
1317 static void init_status_task(struct status_task *st)
1318 {
1319         memset(st, 0, sizeof(struct status_task));
1320         st->sa_time_diff_sign = 1;
1321         st->clock_diff_count = conf.clock_diff_count_arg;
1322         st->current_audio_format_num = -1;
1323         st->btrn = btr_new_node(&(struct btr_node_description)
1324                 EMBRACE(.name = "stat"));
1325
1326         stat_task->task = task_register(&(struct task_info) {
1327                 .name = "stat",
1328                 .pre_select = status_pre_select,
1329                 .post_select = status_post_select,
1330                 .context = stat_task,
1331         }, &sched);
1332 }
1333
1334 static void set_initial_status(void)
1335 {
1336         audiod_status = AUDIOD_ON;
1337         if (!conf.mode_given)
1338                 return;
1339         if (!strcmp(conf.mode_arg, "sb")) {
1340                 audiod_status = AUDIOD_STANDBY;
1341                 return;
1342         }
1343         if (!strcmp(conf.mode_arg, "off")) {
1344                 audiod_status = AUDIOD_OFF;
1345                 return;
1346         }
1347         if (strcmp(conf.mode_arg, "on"))
1348                 PARA_WARNING_LOG("invalid mode\n");
1349 }
1350
1351 __noreturn static void print_help_and_die(void)
1352 {
1353         struct ggo_help h = DEFINE_GGO_HELP(audiod);
1354         bool d = conf.detailed_help_given;
1355         unsigned flags;
1356
1357         flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1358         ggo_print_help(&h, flags);
1359
1360         flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1361         print_receiver_helps(flags);
1362         print_filter_helps(flags);
1363         print_writer_helps(flags);
1364         exit(0);
1365 }
1366
1367 /**
1368  * the main function of para_audiod
1369  *
1370  * \param argc usual argument count
1371  * \param argv usual argument vector
1372  *
1373  * \return EXIT_SUCCESS or EXIT_FAILURE
1374  *
1375  * \sa para_audiod(1)
1376  * */
1377 int main(int argc, char *argv[])
1378 {
1379         int ret, i;
1380         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1381         struct audiod_cmdline_parser_params params = {
1382                 .override = 0,
1383                 .initialize = 1,
1384                 .check_required = 0,
1385                 .check_ambiguity = 0,
1386                 .print_errors = 1
1387         };
1388
1389         valid_fd_012();
1390         audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1391         daemon_set_loglevel(conf.loglevel_arg);
1392         version_handle_flag("audiod", conf.version_given);
1393         /* init receivers/filters/writers early to make help work */
1394         recv_init();
1395         filter_init();
1396         writer_init();
1397         if (conf.help_given || conf.detailed_help_given)
1398                 print_help_and_die();
1399         daemon_drop_privileges_or_die(conf.user_arg, conf.group_arg);
1400         parse_config_or_die();
1401         daemon_init_colors_or_die(conf.color_arg, color_arg_auto, color_arg_no,
1402                 conf.logfile_given, conf.log_color_arg, conf.log_color_given);
1403         init_random_seed_or_die();
1404         daemon_set_flag(DF_LOG_TIME);
1405         daemon_set_flag(DF_LOG_HOSTNAME);
1406         daemon_set_flag(DF_LOG_LL);
1407         if (conf.log_timing_given)
1408                 daemon_set_flag(DF_LOG_TIMING);
1409         if (conf.logfile_given) {
1410                 daemon_set_logfile(conf.logfile_arg);
1411                 daemon_open_log_or_die();
1412         }
1413         ret = parse_stream_args();
1414         if (ret < 0) {
1415                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1416                 exit(EXIT_FAILURE);
1417         }
1418         daemon_log_welcome("para_audiod");
1419         daemon_set_start_time();
1420         set_initial_status();
1421         FOR_EACH_SLOT(i)
1422                 clear_slot(i);
1423         setup_signal_handling();
1424
1425         init_status_task(stat_task);
1426         init_command_task(cmd_task);
1427
1428         if (conf.daemon_given)
1429                 daemonize(false /* parent exits immediately */);
1430
1431         signal_task->task = task_register(&(struct task_info) {
1432                 .name = "signal",
1433                 .pre_select = signal_pre_select,
1434                 .post_select = signal_post_select,
1435                 .context = signal_task,
1436         }, &sched);
1437
1438         sched.default_timeout.tv_sec = 2;
1439         sched.default_timeout.tv_usec = 999 * 1000;
1440         ret = schedule(&sched);
1441         audiod_cleanup();
1442         sched_shutdown(&sched);
1443         signal_shutdown(signal_task);
1444
1445         if (ret < 0)
1446                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1447         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
1448 }