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 /* Describes one instance of a receiver-filter-writer chain. */
  72 struct slot_info {
  73         /* Number of the audio format in this slot. */
  74         int format;
  75         /* The stream_start status item announced by para_server.  */
  76         struct timeval server_stream_start;
  77         /* The offset status item announced by para_server. */
  78         unsigned offset_seconds;
  79         /* The seconds_total status item announced by para_server. */
  80         unsigned seconds_total;
  81         /* The receiver info associated with this slot. */
  82         struct receiver_node *receiver_node;
  83         /* The array of filter nodes. */
  84         struct filter_node *fns;
  85         /* The array of writers attached to the last filter. */
  86         struct writer_node *wns;
  87 };
  88
  89 /** Maximal number of simultaneous instances. */
  90 #define MAX_STREAM_SLOTS 5
  91
  92 /** Iterate over all slots. */
  93 #define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
  94
  95 /**
  96  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  97  * be associated with a receiver/filter/writer triple. This array holds all
  98  * information on the status of these slots.
  99  *
 100  * \sa struct slot_info
 101  * */
 102 struct slot_info slot[MAX_STREAM_SLOTS];
 103
 104 /** The vss status flags audiod is interested in. */
 105 enum vss_status_flags {
 106         /** Whether the 'N' flag is set. */
 107         VSS_STATUS_FLAG_NEXT = 1,
 108         /** The 'P' flag is set. */
 109         VSS_STATUS_FLAG_PLAYING = 2,
 110 };
 111
 112 /**
 113  * The scheduler instance of para_audiod.
 114  *
 115  * This is needed also in audiod_command.c (for the tasks command), so it can
 116  * not be made static.
 117  */
 118 struct sched sched = {.max_fileno = 0};
 119
 120 /* The task for obtaining para_server's status (para_client stat). */
 121 struct status_task {
 122         /** The associated task structure of audiod. */
 123         struct task *task;
 124         /** Client data associated with the stat task. */
 125         struct client_task *ct;
 126         /** Do not restart client command until this time. */
 127         struct timeval restart_barrier;
 128         /** Last time we received status data from para_server. */
 129         struct timeval last_status_read;
 130         size_t min_iqs;
 131         /** The offset value announced by para_server. */
 132         int offset_seconds;
 133         /** The length of the current audio file as announced by para_server. */
 134         int length_seconds;
 135         /** The start of the current stream from the view of para_server. */
 136         struct timeval server_stream_start;
 137         /** The average time deviation between para_server and para_audiod. */
 138         struct timeval sa_time_diff;
 139         /** Whether client time is ahead of server time. */
 140         int sa_time_diff_sign;
 141         /** The 'P' and the 'N' flags as announced by para_server. */
 142         enum vss_status_flags vss_status;
 143         /** Number of times the clock difference is to be checked. */
 144         unsigned clock_diff_count;
 145         /** When to start the next check for clock difference. */
 146         struct timeval clock_diff_barrier;
 147         /** Number of the audio format as announced by para_server. */
 148         int current_audio_format_num;
 149         /* The status task btrn is the child of the client task. */
 150         struct btr_node *btrn;
 151 };
 152
 153 /** The array of status items sent by para_server. */
 154 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
 155
 156 /**
 157  * the current mode of operation of which can be changed by the on/off/cycle
 158  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
 159  */
 160 int audiod_status = AUDIOD_ON;
 161
 162 /**
 163  * the gengetopt args_info struct that holds information on all command line
 164  * arguments
 165  */
 166 struct audiod_args_info conf;
 167
 168 static char *socket_name;
 169 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 170
 171 static struct signal_task *signal_task;
 172
 173 static struct status_task status_task_struct;
 174
 175 /**
 176  * the task that calls the status command of para_server
 177  *
 178  * \sa struct status_task
 179  */
 180 static struct status_task *stat_task = &status_task_struct;
 181
 182 /*
 183  * The task for handling audiod commands.
 184  *
 185  * We need two listening sockets for backward compability: on Linux systems
 186  * fd[0] is an abstract socket (more precisely, a socket bound to an address in
 187  * the abstract namespace), and fd[1] is the usual pathname socket. On other
 188  * systems, fd[0] is negative, and only the pathname socket is used.
 189  *
 190  * For 0.5.x we accept connections on both sockets to make sure that old
 191  * para_audioc versions can still connect. New versions use only the abstract
 192  * socket. Hence after v0.6.0 we can go back to a single socket, either an
 193  * abstract one (Linux) or a pathname socket (all other systems).
 194  */
 195 struct command_task {
 196         /** The local listening sockets. */
 197         int fd[2];
 198         /** the associated task structure */
 199         struct task *task;
 200 };
 201
 202 /** iterate over all supported audio formats */
 203 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 204
 205 /**
 206  * Get the audio format number.
 207  *
 208  * \param name The name of the audio format.
 209  *
 210  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 211  * \a name is not a supported audio format.
 212  */
 213 static int get_audio_format_num(const char *name)
 214 {
 215         int i;
 216
 217         while (para_isspace(*name))
 218                 name++;
 219         FOR_EACH_AUDIO_FORMAT(i)
 220                 if (!strcmp(name, audio_formats[i]))
 221                         return i;
 222         return -E_UNSUPPORTED_AUDIO_FORMAT;
 223 }
 224
 225 /**
 226  * Return the flags for the \a decoder_flags status item.
 227  *
 228  * Allocates a string which contains one octal digit per slot.  Bit zero (value
 229  * 1) is set if a receiver is active. Bit one (value 2) and bit three (value 4)
 230  * have the analogous meaning for filter and writer, respectively.
 231  *
 232  * \return String that must be freed by the caller.
 233  */
 234 __malloc char *audiod_get_decoder_flags(void)
 235 {
 236         int i;
 237         char flags[MAX_STREAM_SLOTS + 1];
 238
 239         FOR_EACH_SLOT(i) {
 240                 struct slot_info *s = &slot[i];
 241                 char flag = '0';
 242                 if (s->receiver_node)
 243                         flag += 1;
 244                 if (s->fns)
 245                         flag += 2;
 246                 if (s->wns)
 247                         flag += 4;
 248                 flags[i] = flag;
 249         }
 250         flags[MAX_STREAM_SLOTS] = '\0';
 251         return para_strdup(flags);
 252 }
 253
 254 static int get_matching_audio_format_nums(const char *re)
 255 {
 256         int i, ret;
 257         regex_t preg;
 258
 259         ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
 260         if (ret < 0)
 261                 return ret;
 262         ret = 0;
 263         FOR_EACH_AUDIO_FORMAT(i)
 264                 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
 265                         ret |= (1 << i);
 266         regfree(&preg);
 267         return ret;
 268 }
 269
 270 static int get_play_time_slot_num(void)
 271 {
 272         int i, oldest_slot = -1;
 273         struct timeval oldest_wstime = {0, 0};
 274
 275         FOR_EACH_SLOT(i) {
 276                 struct slot_info *s = &slot[i];
 277                 struct timeval wstime;
 278                 if (!s->wns || !s->wns[0].btrn)
 279                         continue;
 280                 btr_get_node_start(s->wns[0].btrn, &wstime);
 281                 if (oldest_slot >= 0 && tv_diff(&wstime, &oldest_wstime, NULL) > 0)
 282                         continue;
 283                 oldest_wstime = wstime;
 284                 oldest_slot = i;
 285         }
 286         return oldest_slot;
 287 }
 288
 289 /**
 290  * Compute the play time based on information of the current slot.
 291  *
 292  * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
 293  * from the status items received from para_server and the start time of the
 294  * (first) writer of the current slot.
 295  *
 296  * It has to take into account that the stream was probably not started at
 297  * the beginning of the file, that the clock between the server and the client
 298  * host may differ and that playback of the stream was delayed, e.g. because
 299  * the prebuffer filter is used in the filter configuration.
 300  *
 301  * If no writer is active, for example because para_audiod runs in standby
 302  * mode, an approximation based only on the status items is computed and the
 303  * returned string is prefixed with "~".
 304  *
 305  * \return A string that must be freed by the caller.
 306  */
 307 char *get_time_string(void)
 308 {
 309         int ret, seconds = 0, length;
 310         struct timeval *tmp, sum, sss, /* server stream start */
 311                 rstime, /* receiver start time */
 312                 wstime, /* writer start time */
 313                 wtime, /* now - writer start */
 314                 rskip; /* receiver start - sss */
 315         int slot_num = get_play_time_slot_num();
 316         struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
 317         char *msg;
 318
 319         if (audiod_status == AUDIOD_OFF)
 320                 goto empty;
 321         if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
 322                 if (stat_task->length_seconds) /* paused */
 323                         return NULL;
 324                 goto empty; /* stopped */
 325         }
 326         if (audiod_status == AUDIOD_ON && !s)
 327                 goto empty;
 328         /*
 329          * Valid status items and playing, set length and tmp to the stream
 330          * start. We use the slot info and fall back to the info from current
 331          * status items if no slot info is available.
 332          */
 333         length = stat_task->length_seconds;
 334         tmp = &stat_task->server_stream_start;
 335         if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
 336                 btr_get_node_start(s->wns[0].btrn, &wstime);
 337                 if (wstime.tv_sec != 0) { /* writer wrote something */
 338                         if (s->server_stream_start.tv_sec == 0) {
 339                                 /* copy status info to slot */
 340                                 s->server_stream_start = stat_task->server_stream_start;
 341                                 s->offset_seconds = stat_task->offset_seconds;
 342                                 s->seconds_total = stat_task->length_seconds;
 343                         }
 344                         length = s->seconds_total;
 345                         tmp = &s->server_stream_start;
 346                 }
 347         }
 348         if (stat_task->sa_time_diff_sign > 0)
 349                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
 350         else
 351                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
 352         if (!s || !s->wns || !s->wns[0].btrn) {
 353                 struct timeval diff;
 354                 tv_diff(now, &sss, &diff);
 355                 seconds = diff.tv_sec + stat_task->offset_seconds;
 356                 goto out;
 357         }
 358         tv_diff(now, &wstime, &wtime);
 359         //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
 360         seconds = s->offset_seconds;
 361         if (s->receiver_node->btrn) {
 362                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 363                 ret = tv_diff(&rstime, &sss, &rskip);
 364                 if (ret > 0) { /* audiod was started in the middle of the stream */
 365                         tv_add(&wtime, &rskip, &sum);
 366                         seconds += sum.tv_sec;
 367                 } else
 368                         seconds += wtime.tv_sec;
 369         } else
 370                 seconds += wtime.tv_sec;
 371 out:
 372         seconds = PARA_MIN(seconds, length);
 373         seconds = PARA_MAX(seconds, 0);
 374         msg = make_message(
 375                 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
 376                 s? "" : "~",
 377                 seconds / 60,
 378                 seconds % 60,
 379                 (length - seconds) / 60,
 380                 (length - seconds) % 60,
 381                 length? (seconds * 100 + length / 2) / length : 0,
 382                 length / 60,
 383                 length % 60
 384         );
 385         //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
 386         return msg;
 387 empty:
 388         return para_strdup(NULL);
 389 }
 390
 391 static void parse_config_or_die(void)
 392 {
 393         int ret;
 394         char *config_file;
 395         struct audiod_cmdline_parser_params params = {
 396                 .override = 0,
 397                 .initialize = 0,
 398                 .check_required = 1,
 399                 .check_ambiguity = 0,
 400                 .print_errors = 1
 401         };
 402
 403         if (conf.config_file_given)
 404                 config_file = para_strdup(conf.config_file_arg);
 405         else {
 406                 char *home = para_homedir();
 407                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 408                 free(home);
 409         }
 410         ret = file_exists(config_file);
 411         if (conf.config_file_given && !ret) {
 412                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 413                 goto err;
 414         }
 415         if (ret) {
 416                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 417                 daemon_set_loglevel(conf.loglevel_arg);
 418         }
 419         free(config_file);
 420         return;
 421 err:
 422         free(config_file);
 423         exit(EXIT_FAILURE);
 424 }
 425
 426 static void setup_signal_handling(void)
 427 {
 428         signal_task = signal_init_or_die();
 429         para_install_sighandler(SIGINT);
 430         para_install_sighandler(SIGTERM);
 431         para_install_sighandler(SIGHUP);
 432         para_sigaction(SIGPIPE, SIG_IGN);
 433 }
 434
 435 static void clear_slot(int slot_num)
 436 {
 437         struct slot_info *s = &slot[slot_num];
 438
 439         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 440         memset(s, 0, sizeof(struct slot_info));
 441         s->format = -1;
 442 }
 443
 444 static void close_receiver(int slot_num)
 445 {
 446         struct slot_info *s = &slot[slot_num];
 447         struct audio_format_info *a;
 448
 449         if (s->format < 0 || !s->receiver_node)
 450                 return;
 451         a = &afi[s->format];
 452         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 453                 audio_formats[s->format], slot_num);
 454         a->receiver->close(s->receiver_node);
 455         btr_remove_node(&s->receiver_node->btrn);
 456         task_reap(&s->receiver_node->task);
 457         free(s->receiver_node);
 458         s->receiver_node = NULL;
 459         stat_task->current_audio_format_num = -1;
 460         tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
 461                 &a->restart_barrier);
 462 }
 463
 464 static void writer_cleanup(struct writer_node *wn)
 465 {
 466         struct writer *w;
 467
 468         if (!wn)
 469                 return;
 470         w = writers + wn->writer_num;
 471         PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
 472         w->close(wn);
 473         btr_remove_node(&wn->btrn);
 474         task_reap(&wn->task);
 475 }
 476
 477 static void close_writers(struct slot_info *s)
 478 {
 479         struct audio_format_info *a;
 480         int i;
 481
 482         if (s->format < 0)
 483                 return;
 484         assert(s->wns);
 485         a = afi + s->format;
 486         if (a->num_writers == 0)
 487                 writer_cleanup(s->wns);
 488         else {
 489                 for (i = 0; i < a->num_writers; i++)
 490                         writer_cleanup(s->wns + i);
 491         }
 492         free(s->wns);
 493         s->wns = NULL;
 494 }
 495
 496 static void close_filters(struct slot_info *s)
 497 {
 498         int i;
 499         struct audio_format_info *a = afi + s->format;
 500         if (a->num_filters == 0)
 501                 return;
 502         for (i = a->num_filters - 1; i >= 0; i--) {
 503                 struct filter_node *fn = s->fns + i;
 504                 struct filter *f;
 505
 506                 if (!fn)
 507                         continue;
 508                 f = filters + fn->filter_num;
 509                 if (f->close)
 510                         f->close(fn);
 511                 btr_remove_node(&fn->btrn);
 512                 task_reap(&fn->task);
 513         }
 514         free(s->fns);
 515         s->fns = NULL;
 516 }
 517
 518 static void notify_receivers(int error)
 519 {
 520         int i;
 521
 522         FOR_EACH_SLOT(i) {
 523                 struct slot_info *s = slot + i;
 524                 if (s->format < 0)
 525                         continue;
 526                 if (!s->receiver_node)
 527                         continue;
 528                 task_notify(s->receiver_node->task, error);
 529         }
 530 }
 531
 532 static int get_empty_slot(void)
 533 {
 534         int i;
 535         struct slot_info *s;
 536
 537         FOR_EACH_SLOT(i) {
 538                 s = &slot[i];
 539                 if (s->format < 0) {
 540                         clear_slot(i);
 541                         return i;
 542                 }
 543                 if (s->wns || s->receiver_node || s->fns)
 544                         continue;
 545                 clear_slot(i);
 546                 return i;
 547         }
 548         return -E_NO_MORE_SLOTS;
 549 }
 550
 551 static void open_filters(struct slot_info *s)
 552 {
 553         struct audio_format_info *a = afi + s->format;
 554         struct filter_node *fn;
 555         int nf = a->num_filters;
 556         struct btr_node *parent;
 557         int i;
 558
 559         if (nf == 0)
 560                 return;
 561         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 562         assert(s->fns == NULL);
 563         s->fns = para_calloc(nf * sizeof(struct filter_node));
 564         parent = s->receiver_node->btrn;
 565         for (i = 0; i < nf; i++) {
 566                 char buf[20];
 567                 struct filter *f = filters + a->filter_nums[i];
 568                 fn = s->fns + i;
 569                 fn->filter_num = a->filter_nums[i];
 570                 fn->conf = a->filter_conf[i];
 571                 fn->btrn = btr_new_node(&(struct btr_node_description)
 572                         EMBRACE(.name = f->name, .parent = parent,
 573                                 .handler = f->execute, .context = fn));
 574
 575                 f->open(fn);
 576                 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
 577                 fn->task = task_register(&(struct task_info) {
 578                         .name = buf,
 579                         .pre_select = f->pre_select,
 580                         .post_select = f->post_select,
 581                         .context = fn,
 582                 }, &sched);
 583                 parent = fn->btrn;
 584                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 585                         audio_formats[s->format], i,  nf, f->name, (int)(s - slot));
 586         }
 587 }
 588
 589 static void open_writers(struct slot_info *s)
 590 {
 591         int i;
 592         struct audio_format_info *a = afi + s->format;
 593         struct writer_node *wn;
 594         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 595
 596         assert(s->wns == NULL);
 597         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 598                 * sizeof(struct writer_node));
 599         for (i = 0; i < a->num_writers; i++) {
 600                 wn = s->wns + i;
 601                 wn->conf = a->writer_conf[i];
 602                 wn->writer_num = a->writer_nums[i];
 603                 register_writer_node(wn, parent, &sched);
 604                 PARA_NOTICE_LOG("%s writer started in slot %d\n",
 605                         writer_names[a->writer_nums[i]], (int)(s - slot));
 606         }
 607 }
 608
 609 /* returns slot num on success */
 610 static int open_receiver(int format)
 611 {
 612         struct audio_format_info *a = &afi[format];
 613         struct slot_info *s;
 614         int ret, slot_num;
 615         struct receiver *r = a->receiver;
 616         struct receiver_node *rn;
 617
 618         tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
 619         ret = get_empty_slot();
 620         if (ret < 0)
 621                 return ret;
 622         slot_num = ret;
 623         rn = para_calloc(sizeof(*rn));
 624         rn->receiver = r;
 625         rn->conf = a->receiver_conf;
 626         rn->btrn = btr_new_node(&(struct btr_node_description)
 627                 EMBRACE(.name = r->name, .context = rn));
 628         ret = r->open(rn);
 629         if (ret < 0) {
 630                 btr_remove_node(&rn->btrn);
 631                 free(rn);
 632                 return ret;
 633         }
 634         s = &slot[slot_num];
 635         s->format = format;
 636         s->receiver_node = rn;
 637         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 638                 audio_formats[format], r->name, slot_num);
 639         rn->task = task_register(&(struct task_info) {
 640                 .name = r->name,
 641                 .pre_select = r->pre_select,
 642                 .post_select = r->post_select,
 643                 .context = rn,
 644         }, &sched);
 645         return slot_num;
 646 }
 647
 648 static bool receiver_running(void)
 649 {
 650         int i;
 651         long unsigned ss1 = stat_task->server_stream_start.tv_sec;
 652
 653         FOR_EACH_SLOT(i) {
 654                 struct slot_info *s = &slot[i];
 655                 long unsigned ss2 = s->server_stream_start.tv_sec;
 656
 657                 if (!s->receiver_node)
 658                         continue;
 659                 if (task_status(s->receiver_node->task) >= 0)
 660                         return true;
 661                 if (ss1 == ss2)
 662                         return true;
 663         }
 664         return false;
 665 }
 666
 667 /**
 668  * Return the root node of the current buffer tree.
 669  *
 670  * This is only used for stream grabbing.
 671  *
 672  * \return \p NULL if no slot is currently active. If more than one buffer tree
 673  * exists, the node corresponding to the most recently started receiver is
 674  * returned.
 675  */
 676 struct btr_node *audiod_get_btr_root(void)
 677 {
 678         int i, newest_slot = -1;
 679         struct timeval newest_rstime = {0, 0};
 680
 681         FOR_EACH_SLOT(i) {
 682                 struct slot_info *s = &slot[i];
 683                 struct timeval rstime;
 684                 if (!s->receiver_node)
 685                         continue;
 686                 if (task_status(s->receiver_node->task) < 0)
 687                         continue;
 688                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 689                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 690                         continue;
 691                 newest_rstime = rstime;
 692                 newest_slot = i;
 693         }
 694         if (newest_slot == -1)
 695                 return NULL;
 696         return slot[newest_slot].receiver_node->btrn;
 697 }
 698
 699 /* whether a new instance of a decoder should be started. */
 700 static bool must_start_decoder(void)
 701 {
 702         int cafn = stat_task->current_audio_format_num;
 703         unsigned vs = stat_task->vss_status;
 704
 705         if (audiod_status != AUDIOD_ON)
 706                 return false;
 707         if (cafn < 0)
 708                 return false;
 709         if (!stat_task->ct)
 710                 return false;
 711         if (vs & VSS_STATUS_FLAG_NEXT)
 712                 return false;
 713         if (!(vs & VSS_STATUS_FLAG_PLAYING))
 714                 return false;
 715         if (receiver_running())
 716                 return false;
 717         if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
 718                 return false;
 719         return true;
 720 }
 721
 722 static void compute_time_diff(const struct timeval *status_time)
 723 {
 724         struct timeval tmp, diff;
 725         static unsigned count;
 726         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 727         const struct timeval max_deviation = {0, 500 * 1000};
 728         const int time_smooth = 5;
 729
 730         sign = tv_diff(status_time, now, &diff);
 731 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 732 //                      sign, sa_time_diff_sign);
 733         if (!count) {
 734                 sa_time_diff_sign = sign;
 735                 stat_task->sa_time_diff = diff;
 736                 count++;
 737                 goto out;
 738         }
 739         if (count > 5) {
 740                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 741                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 742                         PARA_WARNING_LOG("time diff jump: %lims\n",
 743                                 s * tv2ms(&tmp));
 744         }
 745         count++;
 746         sa_time_diff_sign = tv_convex_combination(
 747                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 748                 count > 10? sign : sign * time_smooth, &diff,
 749                 &tmp);
 750         stat_task->sa_time_diff = tmp;
 751         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 752                 sign < 0? "-" : "+",
 753                 tv2ms(&diff),
 754                 sa_time_diff_sign < 0? "-" : "+",
 755                 tv2ms(&stat_task->sa_time_diff)
 756         );
 757 out:
 758         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 759 }
 760
 761 static int update_item(int itemnum, char *buf)
 762 {
 763         long unsigned sec, usec;
 764
 765         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 766                 return 1;
 767         free(stat_item_values[itemnum]);
 768         stat_item_values[itemnum] = para_strdup(buf);
 769         stat_client_write_item(itemnum);
 770         switch (itemnum) {
 771         case SI_STATUS_FLAGS:
 772                 stat_task->vss_status = 0;
 773                 if (strchr(buf, 'N'))
 774                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 775                 if (strchr(buf, 'P'))
 776                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 777                 break;
 778         case SI_OFFSET:
 779                 stat_task->offset_seconds = atoi(buf);
 780                 break;
 781         case SI_SECONDS_TOTAL:
 782                 stat_task->length_seconds = atoi(buf);
 783                 break;
 784         case SI_STREAM_START:
 785                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 786                         stat_task->server_stream_start.tv_sec = sec;
 787                         stat_task->server_stream_start.tv_usec = usec;
 788                 }
 789                 break;
 790         case SI_CURRENT_TIME:
 791                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 792                         struct timeval tv = {sec, usec};
 793                         compute_time_diff(&tv);
 794                 }
 795                 break;
 796         case SI_FORMAT:
 797                 stat_task->current_audio_format_num
 798                         = get_audio_format_num(buf);
 799         }
 800         return 1;
 801 }
 802
 803 static int parse_stream_command(const char *txt, char **cmd)
 804 {
 805         int ret, len;
 806         char *re, *p = strchr(txt, ':');
 807
 808         if (!p)
 809                 return -E_MISSING_COLON;
 810         *cmd = p + 1;
 811         len = p - txt;
 812         re = malloc(len + 1);
 813         strncpy(re, txt, len);
 814         re[len] = '\0';
 815         ret = get_matching_audio_format_nums(re);
 816         free(re);
 817         return ret;
 818 }
 819
 820 static int add_filter(int format, char *cmdline)
 821 {
 822         struct audio_format_info *a = &afi[format];
 823         int filter_num, nf = a->num_filters;
 824         void *cfg;
 825
 826         filter_num = check_filter_arg(cmdline, &cfg);
 827         if (filter_num < 0)
 828                 return filter_num;
 829         a->filter_conf = para_realloc(a->filter_conf,
 830                 (nf + 1) * sizeof(void *));
 831         a->filter_nums = para_realloc(a->filter_nums,
 832                 (nf + 1) * sizeof(unsigned));
 833         a->filter_nums[nf] = filter_num;
 834         a->filter_conf[nf] = cfg;
 835         a->num_filters++;
 836         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 837                 filters[filter_num].name);
 838         return filter_num;
 839 }
 840
 841 static int parse_writer_args(void)
 842 {
 843         int i, ret;
 844         char *cmd;
 845         struct audio_format_info *a;
 846
 847         for (i = 0; i < conf.writer_given; i++) {
 848                 void *wconf;
 849                 int j, nw, writer_num, af_mask;
 850
 851                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 852                 if (ret < 0)
 853                         return ret;
 854                 af_mask = ret;
 855                 FOR_EACH_AUDIO_FORMAT(j) {
 856                         a = afi + j;
 857                         if ((af_mask & (1 << j)) == 0) /* no match */
 858                                 continue;
 859                         wconf = check_writer_arg_or_die(cmd, &writer_num);
 860                         nw = a->num_writers;
 861                         a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
 862                         a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
 863                         a->writer_nums[nw] = writer_num;
 864                         a->writer_conf[nw] = wconf;
 865                         PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
 866                                 nw, writer_names[writer_num]);
 867                         a->num_writers++;
 868                 }
 869         }
 870         /* Use default writer for audio formats which are not yet set up. */
 871         FOR_EACH_AUDIO_FORMAT(i) {
 872                 void *writer_conf;
 873                 int writer_num;
 874                 a = afi + i;
 875                 if (a->num_writers > 0)
 876                         continue; /* already set up */
 877                 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
 878                 a->writer_nums = para_malloc(sizeof(int));
 879                 a->writer_nums[0] = writer_num;
 880                 a->writer_conf = para_malloc(sizeof(void *));
 881                 a->writer_conf[0] = writer_conf;
 882                 a->num_writers = 1;
 883                 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
 884                         writer_names[writer_num]);
 885         }
 886         return 1;
 887 }
 888
 889 static int parse_receiver_args(void)
 890 {
 891         int i, ret, receiver_num;
 892         char *cmd = NULL;
 893         struct audio_format_info *a;
 894
 895         for (i = conf.receiver_given - 1; i >= 0; i--) {
 896                 char *arg;
 897                 int j, af_mask;
 898
 899                 ret = parse_stream_command(conf.receiver_arg[i], &arg);
 900                 if (ret < 0)
 901                         goto out;
 902                 af_mask = ret;
 903                 FOR_EACH_AUDIO_FORMAT(j) {
 904                         a = afi + j;
 905                         if ((af_mask & (1 << j)) == 0) /* no match */
 906                                 continue;
 907                         /*
 908                          * If multiple receivers are given for this audio format, the
 909                          * last one wins and we have to free the previous receiver
 910                          * config here. Since we are iterating backwards, the winning
 911                          * receiver arg is in fact the first one given.
 912                          */
 913                         if (a->receiver_conf)
 914                                 a->receiver->free_config(a->receiver_conf);
 915                         a->receiver_conf = check_receiver_arg(arg, &receiver_num);
 916                         ret = -E_RECV_SYNTAX;
 917                         if (!a->receiver_conf)
 918                                 goto out;
 919                         a->receiver = receivers + receiver_num;
 920                 }
 921         }
 922         /*
 923          * Use the first available receiver with no arguments for those audio
 924          * formats for which no receiver was specified.
 925          */
 926         cmd = para_strdup(receivers[0].name);
 927         FOR_EACH_AUDIO_FORMAT(i) {
 928                 a = &afi[i];
 929                 if (a->receiver_conf)
 930                         continue;
 931                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 932                 if (!a->receiver_conf)
 933                         return -E_RECV_SYNTAX;
 934                 a->receiver = &receivers[receiver_num];
 935         }
 936         FOR_EACH_AUDIO_FORMAT(i) {
 937                 a = afi + i;
 938                 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
 939                         audio_formats[i], a->receiver->name);
 940         }
 941         ret = 1;
 942 out:
 943         free(cmd);
 944         return ret;
 945 }
 946
 947 static int init_default_filters(void)
 948 {
 949         int i, ret = 1;
 950
 951         FOR_EACH_AUDIO_FORMAT(i) {
 952                 struct audio_format_info *a = &afi[i];
 953                 char *tmp;
 954                 int j;
 955
 956                 if (a->num_filters)
 957                         continue; /* no default -- nothing to to */
 958                 /*
 959                  * udp and dccp streams are fec-encoded, so add fecdec as the
 960                  * first filter.
 961                  */
 962                 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
 963                                 strcmp(afi[i].receiver->name, "dccp") == 0) {
 964                         tmp = para_strdup("fecdec");
 965                         add_filter(i, tmp);
 966                         free(tmp);
 967                         if (ret < 0)
 968                                 goto out;
 969                 }
 970                 /* add "dec" to audio format name */
 971                 tmp = make_message("%sdec", audio_formats[i]);
 972                 for (j = 0; filters[j].name; j++)
 973                         if (!strcmp(tmp, filters[j].name))
 974                                 break;
 975                 free(tmp);
 976                 ret = -E_UNSUPPORTED_FILTER;
 977                 if (!filters[j].name)
 978                         goto out;
 979                 tmp = para_strdup(filters[j].name);
 980                 ret = add_filter(i, tmp);
 981                 free(tmp);
 982                 if (ret < 0)
 983                         goto out;
 984                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 985                         filters[j].name);
 986         }
 987 out:
 988         return ret;
 989 }
 990
 991 static int parse_filter_args(void)
 992 {
 993         int i, j, ret, af_mask, num_matches;
 994
 995         for (i = 0; i < conf.filter_given; i++) {
 996                 char *arg;
 997                 ret = parse_stream_command(conf.filter_arg[i], &arg);
 998                 if (ret < 0)
 999                         goto out;
1000                 af_mask = ret;
1001                 num_matches = 0;
1002                 FOR_EACH_AUDIO_FORMAT(j) {
1003                         if ((af_mask & (1 << j)) == 0) /* no match */
1004                                 continue;
1005                         ret = add_filter(j, arg);
1006                         if (ret < 0)
1007                                 goto out;
1008                         num_matches++;
1009                 }
1010                 if (num_matches == 0)
1011                         PARA_WARNING_LOG("ignoring filter spec: %s\n",
1012                                 conf.filter_arg[i]);
1013         }
1014         ret = init_default_filters(); /* use default values for the rest */
1015 out:
1016         return ret;
1017 }
1018
1019 static int parse_stream_args(void)
1020 {
1021         int ret;
1022
1023         ret = parse_receiver_args();
1024         if (ret < 0)
1025                 return ret;
1026         ret = parse_filter_args();
1027         if (ret < 0)
1028                 return ret;
1029         ret = parse_writer_args();
1030         if (ret < 0)
1031                 return ret;
1032         return 1;
1033 }
1034
1035 /* does not unlink socket on errors */
1036 static void init_local_sockets(struct command_task *ct)
1037 {
1038         if (conf.socket_given)
1039                 socket_name = para_strdup(conf.socket_arg);
1040         else {
1041                 char *hn = para_hostname();
1042                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1043                         hn);
1044                 free(hn);
1045         }
1046         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
1047         if (conf.force_given)
1048                 unlink(socket_name);
1049         ct->fd[0] = create_local_socket(socket_name, 0);
1050         ct->fd[1] = create_local_socket(socket_name,
1051                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1052         if (ct->fd[0] >= 0 || ct->fd[1] >= 0)
1053                 return;
1054         PARA_EMERG_LOG("%s\n", para_strerror(-ct->fd[1]));
1055         exit(EXIT_FAILURE);
1056 }
1057
1058 static int signal_post_select(struct sched *s, void *context)
1059 {
1060         struct signal_task *st = context;
1061         int ret, signum;
1062
1063         ret = task_get_notification(st->task);
1064         if (ret < 0)
1065                 return ret;
1066         signum = para_next_signal(&s->rfds);
1067         switch (signum) {
1068         case SIGINT:
1069         case SIGTERM:
1070         case SIGHUP:
1071                 PARA_NOTICE_LOG("received signal %d\n", signum);
1072                 task_notify_all(s, E_AUDIOD_SIGNAL);
1073                 return -E_AUDIOD_SIGNAL;
1074         }
1075         return 0;
1076 }
1077
1078 static void command_pre_select(struct sched *s, void *context)
1079 {
1080         struct command_task *ct = context;
1081         int i;
1082
1083         for (i = 0; i < 2; i++)
1084                 if (ct->fd[i] >= 0)
1085                         para_fd_set(ct->fd[i], &s->rfds, &s->max_fileno);
1086 }
1087
1088 static int command_post_select(struct sched *s, void *context)
1089 {
1090         int ret, i;
1091         struct command_task *ct = context;
1092         static struct timeval last_status_dump;
1093         struct timeval tmp, delay;
1094         bool force = false;
1095
1096         ret = task_get_notification(ct->task);
1097         if (ret < 0)
1098                 return ret;
1099         for (i = 0; i < 2; i++) {
1100                 if (ct->fd[i] < 0)
1101                         continue;
1102                 ret = handle_connect(ct->fd[i], &s->rfds);
1103                 if (ret < 0) {
1104                         PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1105                         if (ret == -E_AUDIOD_TERM) {
1106                                 task_notify_all(s, -ret);
1107                                 return ret;
1108                         }
1109                 } else if (ret > 0)
1110                         force = true;
1111         }
1112         if (force == true)
1113                 goto dump;
1114
1115         /* if last status dump was less than 500ms ago, do nothing */
1116         delay.tv_sec = 0;
1117         delay.tv_usec = 500 * 1000;
1118         tv_add(&last_status_dump, &delay, &tmp);
1119         if (tv_diff(now, &tmp, NULL) < 0)
1120                 return 0;
1121
1122         /*
1123          * If last status dump was more than 5s ago, force update. Otherwise,
1124          * update only those items that have changed.
1125          */
1126         delay.tv_sec = 5;
1127         delay.tv_usec = 0;
1128         tv_add(&last_status_dump, &delay, &tmp);
1129         if (tv_diff(now, &tmp, NULL) > 0)
1130                 force = true;
1131 dump:
1132         audiod_status_dump(force);
1133         last_status_dump = *now;
1134         return 1;
1135 }
1136
1137 static void init_command_task(struct command_task *ct)
1138 {
1139         init_local_sockets(ct); /* doesn't return on errors */
1140
1141         ct->task = task_register(&(struct task_info) {
1142                 .name = "command",
1143                 .pre_select = command_pre_select,
1144                 .post_select = command_post_select,
1145                 .context = ct,
1146         }, &sched);
1147 }
1148
1149 static void close_stat_pipe(void)
1150 {
1151         if (!stat_task->ct)
1152                 return;
1153         task_reap(&stat_task->ct->task);
1154         client_close(stat_task->ct);
1155         stat_task->ct = NULL;
1156         clear_and_dump_items();
1157         stat_task->length_seconds = 0;
1158         stat_task->offset_seconds = 0;
1159         stat_task->vss_status = 0;
1160         stat_task->current_audio_format_num = -1;
1161         audiod_status_dump(true);
1162 }
1163
1164 /* avoid busy loop if server is down */
1165 static void set_stat_task_restart_barrier(unsigned seconds)
1166 {
1167         struct timeval delay = {seconds, 0};
1168         tv_add(now, &delay, &stat_task->restart_barrier);
1169 }
1170
1171 static bool must_close_slot(int slot_num)
1172 {
1173         struct slot_info *s = &slot[slot_num];
1174         struct audio_format_info *a = afi + s->format;
1175         int i;
1176
1177         if (s->format < 0)
1178                 return false;
1179         if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1180                 return false;
1181         for (i = 0; i < a->num_filters; i++)
1182                 if (s->fns && task_status(s->fns[i].task) >= 0)
1183                         return false;
1184         if (a->num_writers > 0) {
1185                 for (i = 0; i < a->num_writers; i++)
1186                         if (s->wns && task_status(s->wns[i].task) >= 0)
1187                                 return false;
1188         } else {
1189                 if (s->wns && task_status(s->wns[0].task) >= 0)
1190                         return false;
1191         }
1192         return true;
1193 }
1194
1195 static void close_slot(int slot_num)
1196 {
1197         struct slot_info *s = slot + slot_num;
1198
1199         PARA_INFO_LOG("closing slot %d\n", slot_num);
1200         close_writers(s);
1201         close_filters(s);
1202         close_receiver(slot_num);
1203         clear_slot(slot_num);
1204 }
1205
1206 static void close_unused_slots(void)
1207 {
1208         int i;
1209
1210         FOR_EACH_SLOT(i)
1211                 if (must_close_slot(i))
1212                         close_slot(i);
1213 }
1214
1215 /*
1216  * Cleanup all resources.
1217  *
1218  * This performs various cleanups, removes the audiod socket and closes the
1219  * connection to para_server.
1220  */
1221 static void audiod_cleanup(void)
1222 {
1223         if (socket_name)
1224                 unlink(socket_name);
1225         close_stat_pipe();
1226         close_unused_slots();
1227         audiod_cmdline_parser_free(&conf);
1228         close_stat_clients();
1229 }
1230
1231 /*
1232  * Check if any receivers/filters/writers need to be started and do so if
1233  * necessary.
1234  */
1235 static void start_stop_decoders(void)
1236 {
1237         int ret;
1238         struct slot_info *sl;
1239
1240         close_unused_slots();
1241         if (audiod_status != AUDIOD_ON ||
1242                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1243                 return notify_receivers(E_NOT_PLAYING);
1244         if (!must_start_decoder())
1245                 return;
1246         ret = open_receiver(stat_task->current_audio_format_num);
1247         if (ret < 0) {
1248                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1249                 return;
1250         }
1251         sl = slot + ret;
1252         open_filters(sl);
1253         open_writers(sl);
1254         activate_grab_clients(&sched);
1255         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1256 }
1257
1258 static void status_pre_select(struct sched *s, void *context)
1259 {
1260         struct status_task *st = context;
1261         int i, ret, cafn = stat_task->current_audio_format_num;
1262
1263         if (must_start_decoder())
1264                 goto min_delay;
1265         FOR_EACH_SLOT(i)
1266                 if (must_close_slot(i))
1267                         goto min_delay;
1268         ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1269         if (ret > 0)
1270                 goto min_delay;
1271         if (st->ct && audiod_status == AUDIOD_OFF)
1272                 goto min_delay;
1273         if (!st->ct && audiod_status != AUDIOD_OFF)
1274                 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1275         if (cafn >= 0)
1276                 sched_request_barrier(&afi[cafn].restart_barrier, s);
1277         /*
1278          * If para_server is playing we'd like to have a smooth time display
1279          * even if we are running in standby mode. So we request a timeout that
1280          * expires at the next full second.
1281          */
1282         if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1283                 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1284         return;
1285 min_delay:
1286         sched_min_delay(s);
1287 }
1288
1289 /* restart the client task if necessary */
1290 static int status_post_select(struct sched *s, void *context)
1291 {
1292         struct status_task *st = context;
1293         int ret;
1294
1295         ret = task_get_notification(st->task);
1296         if (ret < 0)
1297                 return ret;
1298         if (audiod_status == AUDIOD_OFF) {
1299                 if (!st->ct)
1300                         goto out;
1301                 if (task_status(st->ct->task) >= 0) {
1302                         task_notify(st->ct->task, E_AUDIOD_OFF);
1303                         goto out;
1304                 }
1305                 close_stat_pipe();
1306                 st->clock_diff_count = conf.clock_diff_count_arg;
1307                 goto out;
1308         }
1309         if (st->ct) {
1310                 char *buf;
1311                 size_t sz;
1312
1313                 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1314                 if (ret < 0) {
1315                         close_stat_pipe();
1316                         goto out;
1317                 }
1318                 if (st->ct->status != CL_EXECUTING)
1319                         goto out;
1320                 if (ret == 0) {
1321                         struct timeval diff;
1322                         tv_diff(now, &st->last_status_read, &diff);
1323                         if (diff.tv_sec > 61)
1324                                 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1325                         goto out;
1326                 }
1327                 btr_merge(st->btrn, st->min_iqs);
1328                 sz = btr_next_buffer(st->btrn, &buf);
1329                 ret = for_each_stat_item(buf, sz, update_item);
1330                 if (ret < 0) {
1331                         task_notify(st->ct->task, -ret);
1332                         goto out;
1333                 }
1334                 if (sz != ret) {
1335                         btr_consume(st->btrn, sz - ret);
1336                         st->last_status_read = *now;
1337                         st->min_iqs = 0;
1338                 } else /* current status item crosses buffers */
1339                         st->min_iqs = sz + 1;
1340                 goto out;
1341         }
1342         btr_drain(st->btrn);
1343         st->current_audio_format_num = -1;
1344         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1345                 goto out;
1346         if (st->clock_diff_count) { /* get status only one time */
1347                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1348                 int argc = 5;
1349                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1350                 st->clock_diff_count--;
1351                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1352                 set_stat_task_restart_barrier(2);
1353
1354         } else {
1355                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1356                 int argc = 4;
1357                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1358                 set_stat_task_restart_barrier(5);
1359         }
1360         free(stat_item_values[SI_BASENAME]);
1361         stat_item_values[SI_BASENAME] = para_strdup(
1362                 "no connection to para_server");
1363         stat_client_write_item(SI_BASENAME);
1364         st->last_status_read = *now;
1365 out:
1366         start_stop_decoders();
1367         return 0;
1368 }
1369
1370 static void init_status_task(struct status_task *st)
1371 {
1372         memset(st, 0, sizeof(struct status_task));
1373         st->sa_time_diff_sign = 1;
1374         st->clock_diff_count = conf.clock_diff_count_arg;
1375         st->current_audio_format_num = -1;
1376         st->btrn = btr_new_node(&(struct btr_node_description)
1377                 EMBRACE(.name = "stat"));
1378
1379         stat_task->task = task_register(&(struct task_info) {
1380                 .name = "stat",
1381                 .pre_select = status_pre_select,
1382                 .post_select = status_post_select,
1383                 .context = stat_task,
1384         }, &sched);
1385 }
1386
1387 static void set_initial_status(void)
1388 {
1389         audiod_status = AUDIOD_ON;
1390         if (!conf.mode_given)
1391                 return;
1392         if (!strcmp(conf.mode_arg, "sb")) {
1393                 audiod_status = AUDIOD_STANDBY;
1394                 return;
1395         }
1396         if (!strcmp(conf.mode_arg, "off")) {
1397                 audiod_status = AUDIOD_OFF;
1398                 return;
1399         }
1400         if (strcmp(conf.mode_arg, "on"))
1401                 PARA_WARNING_LOG("invalid mode\n");
1402 }
1403
1404 __noreturn static void print_help_and_die(void)
1405 {
1406         struct ggo_help h = DEFINE_GGO_HELP(audiod);
1407         bool d = conf.detailed_help_given;
1408         unsigned flags;
1409
1410         flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1411         ggo_print_help(&h, flags);
1412
1413         flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1414         print_receiver_helps(flags);
1415         print_filter_helps(flags);
1416         print_writer_helps(flags);
1417         exit(0);
1418 }
1419
1420 /**
1421  * the main function of para_audiod
1422  *
1423  * \param argc usual argument count
1424  * \param argv usual argument vector
1425  *
1426  * \return EXIT_SUCCESS or EXIT_FAILURE
1427  *
1428  * \sa para_audiod(1)
1429  * */
1430 int main(int argc, char *argv[])
1431 {
1432         int ret, i;
1433         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1434         struct audiod_cmdline_parser_params params = {
1435                 .override = 0,
1436                 .initialize = 1,
1437                 .check_required = 0,
1438                 .check_ambiguity = 0,
1439                 .print_errors = 1
1440         };
1441
1442         valid_fd_012();
1443         audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1444         daemon_set_loglevel(conf.loglevel_arg);
1445         version_handle_flag("audiod", conf.version_given);
1446         /* init receivers/filters/writers early to make help work */
1447         recv_init();
1448         filter_init();
1449         writer_init();
1450         if (conf.help_given || conf.detailed_help_given)
1451                 print_help_and_die();
1452         daemon_drop_privileges_or_die(conf.user_arg, conf.group_arg);
1453         parse_config_or_die();
1454         daemon_init_colors_or_die(conf.color_arg, color_arg_auto, color_arg_no,
1455                 conf.logfile_given, conf.log_color_arg, conf.log_color_given);
1456         init_random_seed_or_die();
1457         daemon_set_flag(DF_LOG_TIME);
1458         daemon_set_flag(DF_LOG_HOSTNAME);
1459         daemon_set_flag(DF_LOG_LL);
1460         if (conf.log_timing_given)
1461                 daemon_set_flag(DF_LOG_TIMING);
1462         if (conf.logfile_given) {
1463                 daemon_set_logfile(conf.logfile_arg);
1464                 daemon_open_log_or_die();
1465         }
1466         ret = parse_stream_args();
1467         if (ret < 0) {
1468                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1469                 exit(EXIT_FAILURE);
1470         }
1471         daemon_log_welcome("para_audiod");
1472         daemon_set_start_time();
1473         set_initial_status();
1474         FOR_EACH_SLOT(i)
1475                 clear_slot(i);
1476         setup_signal_handling();
1477
1478         init_status_task(stat_task);
1479         init_command_task(cmd_task);
1480
1481         if (conf.daemon_given)
1482                 daemonize(false /* parent exits immediately */);
1483
1484         signal_task->task = task_register(&(struct task_info) {
1485                 .name = "signal",
1486                 .pre_select = signal_pre_select,
1487                 .post_select = signal_post_select,
1488                 .context = signal_task,
1489         }, &sched);
1490
1491         sched.default_timeout.tv_sec = 2;
1492         sched.default_timeout.tv_usec = 999 * 1000;
1493         ret = schedule(&sched);
1494         audiod_cleanup();
1495         sched_shutdown(&sched);
1496         signal_shutdown(signal_task);
1497
1498         if (ret < 0)
1499                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1500         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
1501 }