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 #include <pwd.h>
  18
  19 #include "para.h"
  20 #include "error.h"
  21 #include "crypt.h"
  22 #include "audiod.cmdline.h"
  23 #include "list.h"
  24 #include "sched.h"
  25 #include "ggo.h"
  26 #include "buffer_tree.h"
  27 #include "recv.h"
  28 #include "filter.h"
  29 #include "grab_client.h"
  30 #include "client.cmdline.h"
  31 #include "client.h"
  32 #include "audiod.h"
  33 #include "net.h"
  34 #include "daemon.h"
  35 #include "string.h"
  36 #include "fd.h"
  37 #include "write.h"
  38 #include "write_common.h"
  39 #include "signal.h"
  40 #include "version.h"
  41
  42 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
  43 /** define the array of error lists needed by para_audiod */
  44 INIT_AUDIOD_ERRLISTS;
  45 /** define the array containing all supported audio formats */
  46 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
  47
  48 DEFINE_RECEIVER_ARRAY;
  49
  50 /** Defines how audiod handles one supported audio format. */
  51 struct audio_format_info {
  52         /** pointer to the receiver for this audio format */
  53         struct receiver *receiver;
  54         /** the receiver configuration */
  55         void *receiver_conf;
  56         /** the number of filters that should be activated for this audio format */
  57         unsigned int num_filters;
  58         /** Array of filter numbers to be activated. */
  59         unsigned *filter_nums;
  60         /** Pointer to the array of filter configurations. */
  61         void **filter_conf;
  62         /** the number of filters that should be activated for this audio format */
  63         unsigned int num_writers;
  64         /** Array of writer numbers to be activated. */
  65         int *writer_nums;
  66         /** pointer to the array of writer configurations */
  67         void **writer_conf;
  68         /** do not start receiver/filters/writer before this time */
  69         struct timeval restart_barrier;
  70 };
  71
  72 /* Describes one instance of a receiver-filter-writer chain. */
  73 struct slot_info {
  74         /* Number of the audio format in this slot. */
  75         int format;
  76         /* The stream_start status item announced by para_server.  */
  77         struct timeval server_stream_start;
  78         /* The offset status item announced by para_server. */
  79         unsigned offset_seconds;
  80         /* The seconds_total status item announced by para_server. */
  81         unsigned seconds_total;
  82         /* The receiver info associated with this slot. */
  83         struct receiver_node *receiver_node;
  84         /* The array of filter nodes. */
  85         struct filter_node *fns;
  86         /* The array of writers attached to the last filter. */
  87         struct writer_node *wns;
  88 };
  89
  90 /** Maximal number of simultaneous instances. */
  91 #define MAX_STREAM_SLOTS 5
  92
  93 /** Iterate over all slots. */
  94 #define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
  95
  96 /**
  97  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  98  * be associated with a receiver/filter/writer triple. This array holds all
  99  * information on the status of these slots.
 100  *
 101  * \sa struct slot_info
 102  * */
 103 struct slot_info slot[MAX_STREAM_SLOTS];
 104
 105 /** The vss status flags audiod is interested in. */
 106 enum vss_status_flags {
 107         /** Whether the 'N' flag is set. */
 108         VSS_STATUS_FLAG_NEXT = 1,
 109         /** The 'P' flag is set. */
 110         VSS_STATUS_FLAG_PLAYING = 2,
 111 };
 112
 113 /**
 114  * The scheduler instance of para_audiod.
 115  *
 116  * This is needed also in audiod_command.c (for the tasks command), so it can
 117  * not be made static.
 118  */
 119 struct sched sched = {.max_fileno = 0};
 120
 121 /* The task for obtaining para_server's status (para_client stat). */
 122 struct status_task {
 123         /** The associated task structure of audiod. */
 124         struct task *task;
 125         /** Client data associated with the stat task. */
 126         struct client_task *ct;
 127         /** Do not restart client command until this time. */
 128         struct timeval restart_barrier;
 129         /** Last time we received status data from para_server. */
 130         struct timeval last_status_read;
 131         size_t min_iqs;
 132         /** The offset value announced by para_server. */
 133         int offset_seconds;
 134         /** The length of the current audio file as announced by para_server. */
 135         int length_seconds;
 136         /** The start of the current stream from the view of para_server. */
 137         struct timeval server_stream_start;
 138         /** The average time deviation between para_server and para_audiod. */
 139         struct timeval sa_time_diff;
 140         /** Whether client time is ahead of server time. */
 141         int sa_time_diff_sign;
 142         /** The 'P' and the 'N' flags as announced by para_server. */
 143         enum vss_status_flags vss_status;
 144         /** Number of times the clock difference is to be checked. */
 145         unsigned clock_diff_count;
 146         /** When to start the next check for clock difference. */
 147         struct timeval clock_diff_barrier;
 148         /** Number of the audio format as announced by para_server. */
 149         int current_audio_format_num;
 150         /* The status task btrn is the child of the client task. */
 151         struct btr_node *btrn;
 152 };
 153
 154 /** The array of status items sent by para_server. */
 155 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
 156
 157 /**
 158  * the current mode of operation of which can be changed by the on/off/cycle
 159  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
 160  */
 161 int audiod_status = AUDIOD_ON;
 162
 163 /**
 164  * the gengetopt args_info struct that holds information on all command line
 165  * arguments
 166  */
 167 struct audiod_args_info conf;
 168
 169 static char *socket_name;
 170 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 171
 172 static struct signal_task *signal_task;
 173
 174 static struct status_task status_task_struct;
 175
 176 static uid_t *uid_whitelist;
 177
 178 /**
 179  * the task that calls the status command of para_server
 180  *
 181  * \sa struct status_task
 182  */
 183 static struct status_task *stat_task = &status_task_struct;
 184
 185 /*
 186  * The task for handling audiod commands.
 187  *
 188  * We need two listening sockets for backward compability: on Linux systems
 189  * fd[0] is an abstract socket (more precisely, a socket bound to an address in
 190  * the abstract namespace), and fd[1] is the usual pathname socket. On other
 191  * systems, fd[0] is negative, and only the pathname socket is used.
 192  *
 193  * For 0.5.x we accept connections on both sockets to make sure that old
 194  * para_audioc versions can still connect. New versions use only the abstract
 195  * socket. Hence after v0.6.0 we can go back to a single socket, either an
 196  * abstract one (Linux) or a pathname socket (all other systems).
 197  */
 198 struct command_task {
 199         /** The local listening sockets. */
 200         int fd[2];
 201         /** the associated task structure */
 202         struct task *task;
 203 };
 204
 205 /** iterate over all supported audio formats */
 206 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 207
 208 /**
 209  * Get the audio format number.
 210  *
 211  * \param name The name of the audio format.
 212  *
 213  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 214  * \a name is not a supported audio format.
 215  */
 216 static int get_audio_format_num(const char *name)
 217 {
 218         int i;
 219
 220         while (para_isspace(*name))
 221                 name++;
 222         FOR_EACH_AUDIO_FORMAT(i)
 223                 if (!strcmp(name, audio_formats[i]))
 224                         return i;
 225         return -E_UNSUPPORTED_AUDIO_FORMAT;
 226 }
 227
 228 /**
 229  * Return the flags for the \a decoder_flags status item.
 230  *
 231  * Allocates a string which contains one octal digit per slot.  Bit zero (value
 232  * 1) is set if a receiver is active. Bit one (value 2) and bit three (value 4)
 233  * have the analogous meaning for filter and writer, respectively.
 234  *
 235  * \return String that must be freed by the caller.
 236  */
 237 __malloc char *audiod_get_decoder_flags(void)
 238 {
 239         int i;
 240         char flags[MAX_STREAM_SLOTS + 1];
 241
 242         FOR_EACH_SLOT(i) {
 243                 struct slot_info *s = &slot[i];
 244                 char flag = '0';
 245                 if (s->receiver_node)
 246                         flag += 1;
 247                 if (s->fns)
 248                         flag += 2;
 249                 if (s->wns)
 250                         flag += 4;
 251                 flags[i] = flag;
 252         }
 253         flags[MAX_STREAM_SLOTS] = '\0';
 254         return para_strdup(flags);
 255 }
 256
 257 static int get_matching_audio_format_nums(const char *re)
 258 {
 259         int i, ret;
 260         regex_t preg;
 261
 262         ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
 263         if (ret < 0)
 264                 return ret;
 265         ret = 0;
 266         FOR_EACH_AUDIO_FORMAT(i)
 267                 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
 268                         ret |= (1 << i);
 269         regfree(&preg);
 270         return ret;
 271 }
 272
 273 static int get_play_time_slot_num(void)
 274 {
 275         int i, oldest_slot = -1;
 276         struct timeval oldest_wstime = {0, 0};
 277
 278         FOR_EACH_SLOT(i) {
 279                 struct slot_info *s = &slot[i];
 280                 struct timeval wstime;
 281                 if (!s->wns || !s->wns[0].btrn)
 282                         continue;
 283                 btr_get_node_start(s->wns[0].btrn, &wstime);
 284                 if (oldest_slot >= 0 && tv_diff(&wstime, &oldest_wstime, NULL) > 0)
 285                         continue;
 286                 oldest_wstime = wstime;
 287                 oldest_slot = i;
 288         }
 289         return oldest_slot;
 290 }
 291
 292 /**
 293  * Compute the play time based on information of the current slot.
 294  *
 295  * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
 296  * from the status items received from para_server and the start time of the
 297  * (first) writer of the current slot.
 298  *
 299  * It has to take into account that the stream was probably not started at
 300  * the beginning of the file, that the clock between the server and the client
 301  * host may differ and that playback of the stream was delayed, e.g. because
 302  * the prebuffer filter is used in the filter configuration.
 303  *
 304  * If no writer is active, for example because para_audiod runs in standby
 305  * mode, an approximation based only on the status items is computed and the
 306  * returned string is prefixed with "~".
 307  *
 308  * \return A string that must be freed by the caller.
 309  */
 310 char *get_time_string(void)
 311 {
 312         int ret, seconds = 0, length = stat_task->length_seconds;
 313         struct timeval *tmp, sum, sss, /* server stream start */
 314                 rstime, /* receiver start time */
 315                 wstime, /* writer start time */
 316                 wtime, /* now - writer start */
 317                 rskip; /* receiver start - sss */
 318         int slot_num = get_play_time_slot_num();
 319         struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
 320         char *msg;
 321
 322         if (audiod_status == AUDIOD_OFF)
 323                 goto empty;
 324         if (stat_task->server_stream_start.tv_sec == 0) {
 325                 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
 326                         goto out; /* server is about to change file */
 327                 if (length > 0) /* paused */
 328                         return NULL;
 329                 goto empty; /* stopped */
 330         }
 331         /*
 332          * Valid status items and playing, set length and tmp to the stream
 333          * start. We use the slot info and fall back to the info from current
 334          * status items if no slot info is available.
 335          */
 336         tmp = &stat_task->server_stream_start;
 337         if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
 338                 btr_get_node_start(s->wns[0].btrn, &wstime);
 339                 if (wstime.tv_sec != 0) { /* writer wrote something */
 340                         if (s->server_stream_start.tv_sec == 0) {
 341                                 /* copy status info to slot */
 342                                 s->server_stream_start = stat_task->server_stream_start;
 343                                 s->offset_seconds = stat_task->offset_seconds;
 344                                 s->seconds_total = stat_task->length_seconds;
 345                         }
 346                         length = s->seconds_total;
 347                         tmp = &s->server_stream_start;
 348                 }
 349         }
 350         if (stat_task->sa_time_diff_sign > 0)
 351                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
 352         else
 353                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
 354         if (!s || !s->wns || !s->wns[0].btrn || wstime.tv_sec == 0) {
 355                 struct timeval diff;
 356                 tv_diff(now, &sss, &diff);
 357                 seconds = diff.tv_sec + stat_task->offset_seconds;
 358                 goto out;
 359         }
 360         tv_diff(now, &wstime, &wtime);
 361         //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
 362         seconds = s->offset_seconds;
 363         if (s->receiver_node->btrn) {
 364                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 365                 ret = tv_diff(&rstime, &sss, &rskip);
 366                 if (ret > 0) { /* audiod was started in the middle of the stream */
 367                         tv_add(&wtime, &rskip, &sum);
 368                         seconds += sum.tv_sec;
 369                 } else
 370                         seconds += wtime.tv_sec;
 371         } else
 372                 seconds += wtime.tv_sec;
 373 out:
 374         seconds = PARA_MIN(seconds, length);
 375         seconds = PARA_MAX(seconds, 0);
 376         msg = make_message(
 377                 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
 378                 s? "" : "~",
 379                 seconds / 60,
 380                 seconds % 60,
 381                 (length - seconds) / 60,
 382                 (length - seconds) % 60,
 383                 length? (seconds * 100 + length / 2) / length : 0,
 384                 length / 60,
 385                 length % 60
 386         );
 387         //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
 388         return msg;
 389 empty:
 390         return para_strdup(NULL);
 391 }
 392
 393 static void parse_config_or_die(void)
 394 {
 395         int ret, i;
 396         char *config_file;
 397         struct audiod_cmdline_parser_params params = {
 398                 .override = 0,
 399                 .initialize = 0,
 400                 .check_required = 1,
 401                 .check_ambiguity = 0,
 402                 .print_errors = 1
 403         };
 404
 405         if (conf.config_file_given)
 406                 config_file = para_strdup(conf.config_file_arg);
 407         else {
 408                 char *home = para_homedir();
 409                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 410                 free(home);
 411         }
 412         ret = file_exists(config_file);
 413         if (conf.config_file_given && !ret) {
 414                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 415                 free(config_file);
 416                 goto err;
 417         }
 418         if (ret) {
 419                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 420                 daemon_set_loglevel(conf.loglevel_arg);
 421         }
 422         free(config_file);
 423         if (conf.user_allow_given > 0) {
 424                 uid_whitelist = para_malloc(conf.user_allow_given
 425                         * sizeof(uid_t));
 426                 for (i = 0; i < conf.user_allow_given; i++) {
 427                         int32_t val;
 428                         struct passwd *pw;
 429                         ret = para_atoi32(conf.user_allow_arg[i], &val);
 430                         if (ret >= 0) {
 431                                 uid_whitelist[i] = val;
 432                                 continue;
 433                         }
 434                         errno = 0; /* see getpwnam(3) */
 435                         pw = getpwnam(conf.user_allow_arg[i]);
 436                         if (!pw) {
 437                                 PARA_EMERG_LOG("invalid username: %s\n",
 438                                         conf.user_allow_arg[i]);
 439                                 goto err;
 440                         }
 441                         uid_whitelist[i] = pw->pw_uid;
 442                 }
 443         }
 444         return;
 445 err:
 446         exit(EXIT_FAILURE);
 447 }
 448
 449 static void setup_signal_handling(void)
 450 {
 451         signal_task = signal_init_or_die();
 452         para_install_sighandler(SIGINT);
 453         para_install_sighandler(SIGTERM);
 454         para_install_sighandler(SIGHUP);
 455         para_sigaction(SIGPIPE, SIG_IGN);
 456 }
 457
 458 static void clear_slot(int slot_num)
 459 {
 460         struct slot_info *s = &slot[slot_num];
 461
 462         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 463         memset(s, 0, sizeof(struct slot_info));
 464         s->format = -1;
 465 }
 466
 467 static void close_receiver(int slot_num)
 468 {
 469         struct slot_info *s = &slot[slot_num];
 470         struct audio_format_info *a;
 471
 472         if (s->format < 0 || !s->receiver_node)
 473                 return;
 474         a = &afi[s->format];
 475         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 476                 audio_formats[s->format], slot_num);
 477         a->receiver->close(s->receiver_node);
 478         btr_remove_node(&s->receiver_node->btrn);
 479         task_reap(&s->receiver_node->task);
 480         free(s->receiver_node);
 481         s->receiver_node = NULL;
 482         stat_task->current_audio_format_num = -1;
 483         tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
 484                 &a->restart_barrier);
 485 }
 486
 487 static void writer_cleanup(struct writer_node *wn)
 488 {
 489         struct writer *w;
 490
 491         if (!wn)
 492                 return;
 493         w = writers + wn->writer_num;
 494         PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
 495         w->close(wn);
 496         btr_remove_node(&wn->btrn);
 497         task_reap(&wn->task);
 498 }
 499
 500 static void close_writers(struct slot_info *s)
 501 {
 502         struct audio_format_info *a;
 503         int i;
 504
 505         if (s->format < 0)
 506                 return;
 507         assert(s->wns);
 508         a = afi + s->format;
 509         if (a->num_writers == 0)
 510                 writer_cleanup(s->wns);
 511         else {
 512                 for (i = 0; i < a->num_writers; i++)
 513                         writer_cleanup(s->wns + i);
 514         }
 515         free(s->wns);
 516         s->wns = NULL;
 517 }
 518
 519 static void close_filters(struct slot_info *s)
 520 {
 521         int i;
 522         struct audio_format_info *a = afi + s->format;
 523         if (a->num_filters == 0)
 524                 return;
 525         for (i = a->num_filters - 1; i >= 0; i--) {
 526                 struct filter_node *fn = s->fns + i;
 527                 const struct filter *f;
 528
 529                 if (!fn)
 530                         continue;
 531                 f = filter_get(fn->filter_num);
 532                 if (f->close)
 533                         f->close(fn);
 534                 btr_remove_node(&fn->btrn);
 535                 task_reap(&fn->task);
 536         }
 537         free(s->fns);
 538         s->fns = NULL;
 539 }
 540
 541 static void notify_receivers(int error)
 542 {
 543         int i;
 544
 545         FOR_EACH_SLOT(i) {
 546                 struct slot_info *s = slot + i;
 547                 if (s->format < 0)
 548                         continue;
 549                 if (!s->receiver_node)
 550                         continue;
 551                 task_notify(s->receiver_node->task, error);
 552         }
 553 }
 554
 555 static int get_empty_slot(void)
 556 {
 557         int i;
 558         struct slot_info *s;
 559
 560         FOR_EACH_SLOT(i) {
 561                 s = &slot[i];
 562                 if (s->format < 0) {
 563                         clear_slot(i);
 564                         return i;
 565                 }
 566                 if (s->wns || s->receiver_node || s->fns)
 567                         continue;
 568                 clear_slot(i);
 569                 return i;
 570         }
 571         return -E_NO_MORE_SLOTS;
 572 }
 573
 574 static void open_filters(struct slot_info *s)
 575 {
 576         struct audio_format_info *a = afi + s->format;
 577         struct filter_node *fn;
 578         int nf = a->num_filters;
 579         struct btr_node *parent;
 580         int i;
 581
 582         if (nf == 0)
 583                 return;
 584         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 585         assert(s->fns == NULL);
 586         s->fns = para_calloc(nf * sizeof(struct filter_node));
 587         parent = s->receiver_node->btrn;
 588         for (i = 0; i < nf; i++) {
 589                 char buf[20];
 590                 const struct filter *f = filter_get(a->filter_nums[i]);
 591                 fn = s->fns + i;
 592                 fn->filter_num = a->filter_nums[i];
 593                 fn->conf = a->filter_conf[i];
 594                 fn->btrn = btr_new_node(&(struct btr_node_description)
 595                         EMBRACE(.name = f->name, .parent = parent,
 596                                 .handler = f->execute, .context = fn));
 597
 598                 f->open(fn);
 599                 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
 600                 fn->task = task_register(&(struct task_info) {
 601                         .name = buf,
 602                         .pre_select = f->pre_select,
 603                         .post_select = f->post_select,
 604                         .context = fn,
 605                 }, &sched);
 606                 parent = fn->btrn;
 607                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 608                         audio_formats[s->format], i,  nf, f->name, (int)(s - slot));
 609         }
 610 }
 611
 612 static void open_writers(struct slot_info *s)
 613 {
 614         int i;
 615         struct audio_format_info *a = afi + s->format;
 616         struct writer_node *wn;
 617         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 618
 619         assert(s->wns == NULL);
 620         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 621                 * sizeof(struct writer_node));
 622         for (i = 0; i < a->num_writers; i++) {
 623                 wn = s->wns + i;
 624                 wn->conf = a->writer_conf[i];
 625                 wn->writer_num = a->writer_nums[i];
 626                 register_writer_node(wn, parent, &sched);
 627                 PARA_NOTICE_LOG("%s writer started in slot %d\n",
 628                         writer_names[a->writer_nums[i]], (int)(s - slot));
 629         }
 630 }
 631
 632 /* returns slot num on success */
 633 static int open_receiver(int format)
 634 {
 635         struct audio_format_info *a = &afi[format];
 636         struct slot_info *s;
 637         int ret, slot_num;
 638         struct receiver *r = a->receiver;
 639         struct receiver_node *rn;
 640
 641         tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
 642         ret = get_empty_slot();
 643         if (ret < 0)
 644                 return ret;
 645         slot_num = ret;
 646         rn = para_calloc(sizeof(*rn));
 647         rn->receiver = r;
 648         rn->conf = a->receiver_conf;
 649         rn->btrn = btr_new_node(&(struct btr_node_description)
 650                 EMBRACE(.name = r->name, .context = rn));
 651         ret = r->open(rn);
 652         if (ret < 0) {
 653                 btr_remove_node(&rn->btrn);
 654                 free(rn);
 655                 return ret;
 656         }
 657         s = &slot[slot_num];
 658         s->format = format;
 659         s->receiver_node = rn;
 660         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 661                 audio_formats[format], r->name, slot_num);
 662         rn->task = task_register(&(struct task_info) {
 663                 .name = r->name,
 664                 .pre_select = r->pre_select,
 665                 .post_select = r->post_select,
 666                 .context = rn,
 667         }, &sched);
 668         return slot_num;
 669 }
 670
 671 static bool receiver_running(void)
 672 {
 673         int i;
 674         long unsigned ss1 = stat_task->server_stream_start.tv_sec;
 675
 676         FOR_EACH_SLOT(i) {
 677                 struct slot_info *s = &slot[i];
 678                 long unsigned ss2 = s->server_stream_start.tv_sec;
 679
 680                 if (!s->receiver_node)
 681                         continue;
 682                 if (task_status(s->receiver_node->task) >= 0)
 683                         return true;
 684                 if (ss1 == ss2)
 685                         return true;
 686         }
 687         return false;
 688 }
 689
 690 /**
 691  * Return the root node of the current buffer tree.
 692  *
 693  * This is only used for stream grabbing.
 694  *
 695  * \return \p NULL if no slot is currently active. If more than one buffer tree
 696  * exists, the node corresponding to the most recently started receiver is
 697  * returned.
 698  */
 699 struct btr_node *audiod_get_btr_root(void)
 700 {
 701         int i, newest_slot = -1;
 702         struct timeval newest_rstime = {0, 0};
 703
 704         FOR_EACH_SLOT(i) {
 705                 struct slot_info *s = &slot[i];
 706                 struct timeval rstime;
 707                 if (!s->receiver_node)
 708                         continue;
 709                 if (task_status(s->receiver_node->task) < 0)
 710                         continue;
 711                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 712                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 713                         continue;
 714                 newest_rstime = rstime;
 715                 newest_slot = i;
 716         }
 717         if (newest_slot == -1)
 718                 return NULL;
 719         return slot[newest_slot].receiver_node->btrn;
 720 }
 721
 722 /* whether a new instance of a decoder should be started. */
 723 static bool must_start_decoder(void)
 724 {
 725         int cafn = stat_task->current_audio_format_num;
 726         unsigned vs = stat_task->vss_status;
 727
 728         if (audiod_status != AUDIOD_ON)
 729                 return false;
 730         if (cafn < 0)
 731                 return false;
 732         if (!stat_task->ct)
 733                 return false;
 734         if (vs & VSS_STATUS_FLAG_NEXT)
 735                 return false;
 736         if (!(vs & VSS_STATUS_FLAG_PLAYING))
 737                 return false;
 738         if (receiver_running())
 739                 return false;
 740         if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
 741                 return false;
 742         return true;
 743 }
 744
 745 static void compute_time_diff(const struct timeval *status_time)
 746 {
 747         struct timeval tmp, diff;
 748         static unsigned count;
 749         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 750         const struct timeval max_deviation = {0, 500 * 1000};
 751         const int time_smooth = 5;
 752
 753         sign = tv_diff(status_time, now, &diff);
 754 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 755 //                      sign, sa_time_diff_sign);
 756         if (!count) {
 757                 sa_time_diff_sign = sign;
 758                 stat_task->sa_time_diff = diff;
 759                 count++;
 760                 goto out;
 761         }
 762         if (count > 5) {
 763                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 764                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 765                         PARA_WARNING_LOG("time diff jump: %lims\n",
 766                                 s * tv2ms(&tmp));
 767         }
 768         count++;
 769         sa_time_diff_sign = tv_convex_combination(
 770                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 771                 count > 10? sign : sign * time_smooth, &diff,
 772                 &tmp);
 773         stat_task->sa_time_diff = tmp;
 774         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 775                 sign < 0? "-" : "+",
 776                 tv2ms(&diff),
 777                 sa_time_diff_sign < 0? "-" : "+",
 778                 tv2ms(&stat_task->sa_time_diff)
 779         );
 780 out:
 781         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 782 }
 783
 784 static int update_item(int itemnum, char *buf)
 785 {
 786         long unsigned sec, usec;
 787
 788         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 789                 return 1;
 790         free(stat_item_values[itemnum]);
 791         stat_item_values[itemnum] = para_strdup(buf);
 792         stat_client_write_item(itemnum);
 793         switch (itemnum) {
 794         case SI_STATUS_FLAGS:
 795                 stat_task->vss_status = 0;
 796                 if (strchr(buf, 'N'))
 797                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 798                 if (strchr(buf, 'P'))
 799                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 800                 break;
 801         case SI_OFFSET:
 802                 stat_task->offset_seconds = atoi(buf);
 803                 break;
 804         case SI_SECONDS_TOTAL:
 805                 stat_task->length_seconds = atoi(buf);
 806                 break;
 807         case SI_STREAM_START:
 808                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 809                         stat_task->server_stream_start.tv_sec = sec;
 810                         stat_task->server_stream_start.tv_usec = usec;
 811                 }
 812                 break;
 813         case SI_CURRENT_TIME:
 814                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 815                         struct timeval tv = {sec, usec};
 816                         compute_time_diff(&tv);
 817                 }
 818                 break;
 819         case SI_FORMAT:
 820                 stat_task->current_audio_format_num
 821                         = get_audio_format_num(buf);
 822         }
 823         return 1;
 824 }
 825
 826 static int parse_stream_command(const char *txt, char **cmd)
 827 {
 828         int ret, len;
 829         char *re, *p = strchr(txt, ':');
 830
 831         if (!p)
 832                 return -E_MISSING_COLON;
 833         *cmd = p + 1;
 834         len = p - txt;
 835         re = malloc(len + 1);
 836         strncpy(re, txt, len);
 837         re[len] = '\0';
 838         ret = get_matching_audio_format_nums(re);
 839         free(re);
 840         return ret;
 841 }
 842
 843 static int add_filter(int format, char *cmdline)
 844 {
 845         struct audio_format_info *a = &afi[format];
 846         int filter_num, nf = a->num_filters;
 847         void *cfg;
 848
 849         filter_num = check_filter_arg(cmdline, &cfg);
 850         if (filter_num < 0)
 851                 return filter_num;
 852         a->filter_conf = para_realloc(a->filter_conf,
 853                 (nf + 1) * sizeof(void *));
 854         a->filter_nums = para_realloc(a->filter_nums,
 855                 (nf + 1) * sizeof(unsigned));
 856         a->filter_nums[nf] = filter_num;
 857         a->filter_conf[nf] = cfg;
 858         a->num_filters++;
 859         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 860                 filter_get(filter_num)->name);
 861         return filter_num;
 862 }
 863
 864 static int parse_writer_args(void)
 865 {
 866         int i, ret;
 867         char *cmd;
 868         struct audio_format_info *a;
 869
 870         for (i = 0; i < conf.writer_given; i++) {
 871                 void *wconf;
 872                 int j, nw, writer_num, af_mask;
 873
 874                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 875                 if (ret < 0)
 876                         return ret;
 877                 af_mask = ret;
 878                 FOR_EACH_AUDIO_FORMAT(j) {
 879                         a = afi + j;
 880                         if ((af_mask & (1 << j)) == 0) /* no match */
 881                                 continue;
 882                         wconf = check_writer_arg_or_die(cmd, &writer_num);
 883                         nw = a->num_writers;
 884                         a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
 885                         a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
 886                         a->writer_nums[nw] = writer_num;
 887                         a->writer_conf[nw] = wconf;
 888                         PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
 889                                 nw, writer_names[writer_num]);
 890                         a->num_writers++;
 891                 }
 892         }
 893         /* Use default writer for audio formats which are not yet set up. */
 894         FOR_EACH_AUDIO_FORMAT(i) {
 895                 void *writer_conf;
 896                 int writer_num;
 897                 a = afi + i;
 898                 if (a->num_writers > 0)
 899                         continue; /* already set up */
 900                 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
 901                 a->writer_nums = para_malloc(sizeof(int));
 902                 a->writer_nums[0] = writer_num;
 903                 a->writer_conf = para_malloc(sizeof(void *));
 904                 a->writer_conf[0] = writer_conf;
 905                 a->num_writers = 1;
 906                 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
 907                         writer_names[writer_num]);
 908         }
 909         return 1;
 910 }
 911
 912 static int parse_receiver_args(void)
 913 {
 914         int i, ret, receiver_num;
 915         char *cmd = NULL;
 916         struct audio_format_info *a;
 917
 918         for (i = conf.receiver_given - 1; i >= 0; i--) {
 919                 char *arg;
 920                 int j, af_mask;
 921
 922                 ret = parse_stream_command(conf.receiver_arg[i], &arg);
 923                 if (ret < 0)
 924                         goto out;
 925                 af_mask = ret;
 926                 FOR_EACH_AUDIO_FORMAT(j) {
 927                         a = afi + j;
 928                         if ((af_mask & (1 << j)) == 0) /* no match */
 929                                 continue;
 930                         /*
 931                          * If multiple receivers are given for this audio format, the
 932                          * last one wins and we have to free the previous receiver
 933                          * config here. Since we are iterating backwards, the winning
 934                          * receiver arg is in fact the first one given.
 935                          */
 936                         if (a->receiver_conf)
 937                                 a->receiver->free_config(a->receiver_conf);
 938                         a->receiver_conf = check_receiver_arg(arg, &receiver_num);
 939                         ret = -E_RECV_SYNTAX;
 940                         if (!a->receiver_conf)
 941                                 goto out;
 942                         a->receiver = receivers + receiver_num;
 943                 }
 944         }
 945         /*
 946          * Use the first available receiver with no arguments for those audio
 947          * formats for which no receiver was specified.
 948          */
 949         cmd = para_strdup(receivers[0].name);
 950         FOR_EACH_AUDIO_FORMAT(i) {
 951                 a = &afi[i];
 952                 if (a->receiver_conf)
 953                         continue;
 954                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 955                 if (!a->receiver_conf)
 956                         return -E_RECV_SYNTAX;
 957                 a->receiver = &receivers[receiver_num];
 958         }
 959         FOR_EACH_AUDIO_FORMAT(i) {
 960                 a = afi + i;
 961                 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
 962                         audio_formats[i], a->receiver->name);
 963         }
 964         ret = 1;
 965 out:
 966         free(cmd);
 967         return ret;
 968 }
 969
 970 static int init_default_filters(void)
 971 {
 972         int i, ret = 1;
 973
 974         FOR_EACH_AUDIO_FORMAT(i) {
 975                 struct audio_format_info *a = &afi[i];
 976                 char *tmp;
 977                 int j;
 978
 979                 if (a->num_filters)
 980                         continue; /* no default -- nothing to to */
 981                 /*
 982                  * udp and dccp streams are fec-encoded, so add fecdec as the
 983                  * first filter.
 984                  */
 985                 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
 986                                 strcmp(afi[i].receiver->name, "dccp") == 0) {
 987                         tmp = para_strdup("fecdec");
 988                         add_filter(i, tmp);
 989                         free(tmp);
 990                         if (ret < 0)
 991                                 goto out;
 992                 }
 993                 /* add "dec" to audio format name */
 994                 tmp = make_message("%sdec", audio_formats[i]);
 995                 for (j = 0; filter_get(j); j++)
 996                         if (!strcmp(tmp, filter_get(j)->name))
 997                                 break;
 998                 free(tmp);
 999                 ret = -E_UNSUPPORTED_FILTER;
1000                 if (!filter_get(j))
1001                         goto out;
1002                 tmp = para_strdup(filter_get(j)->name);
1003                 ret = add_filter(i, tmp);
1004                 free(tmp);
1005                 if (ret < 0)
1006                         goto out;
1007                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1008                         filter_get(j)->name);
1009         }
1010 out:
1011         return ret;
1012 }
1013
1014 static int parse_filter_args(void)
1015 {
1016         int i, j, ret, af_mask, num_matches;
1017
1018         for (i = 0; i < conf.filter_given; i++) {
1019                 char *arg;
1020                 ret = parse_stream_command(conf.filter_arg[i], &arg);
1021                 if (ret < 0)
1022                         goto out;
1023                 af_mask = ret;
1024                 num_matches = 0;
1025                 FOR_EACH_AUDIO_FORMAT(j) {
1026                         if ((af_mask & (1 << j)) == 0) /* no match */
1027                                 continue;
1028                         ret = add_filter(j, arg);
1029                         if (ret < 0)
1030                                 goto out;
1031                         num_matches++;
1032                 }
1033                 if (num_matches == 0)
1034                         PARA_WARNING_LOG("ignoring filter spec: %s\n",
1035                                 conf.filter_arg[i]);
1036         }
1037         ret = init_default_filters(); /* use default values for the rest */
1038 out:
1039         return ret;
1040 }
1041
1042 static int parse_stream_args(void)
1043 {
1044         int ret;
1045
1046         ret = parse_receiver_args();
1047         if (ret < 0)
1048                 return ret;
1049         ret = parse_filter_args();
1050         if (ret < 0)
1051                 return ret;
1052         ret = parse_writer_args();
1053         if (ret < 0)
1054                 return ret;
1055         return 1;
1056 }
1057
1058 /* does not unlink socket on errors */
1059 static void init_local_sockets(struct command_task *ct)
1060 {
1061         if (conf.socket_given)
1062                 socket_name = para_strdup(conf.socket_arg);
1063         else {
1064                 char *hn = para_hostname();
1065                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1066                         hn);
1067                 free(hn);
1068         }
1069         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
1070         if (conf.force_given)
1071                 unlink(socket_name);
1072         ct->fd[0] = create_local_socket(socket_name, 0);
1073         ct->fd[1] = create_local_socket(socket_name,
1074                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1075         if (ct->fd[0] >= 0 || ct->fd[1] >= 0)
1076                 return;
1077         PARA_EMERG_LOG("%s\n", para_strerror(-ct->fd[1]));
1078         exit(EXIT_FAILURE);
1079 }
1080
1081 static int signal_post_select(struct sched *s, void *context)
1082 {
1083         struct signal_task *st = context;
1084         int ret, signum;
1085
1086         ret = task_get_notification(st->task);
1087         if (ret < 0)
1088                 return ret;
1089         signum = para_next_signal(&s->rfds);
1090         switch (signum) {
1091         case SIGINT:
1092         case SIGTERM:
1093         case SIGHUP:
1094                 PARA_NOTICE_LOG("received signal %d\n", signum);
1095                 task_notify_all(s, E_AUDIOD_SIGNAL);
1096                 return -E_AUDIOD_SIGNAL;
1097         }
1098         return 0;
1099 }
1100
1101 static void command_pre_select(struct sched *s, void *context)
1102 {
1103         struct command_task *ct = context;
1104         int i;
1105
1106         for (i = 0; i < 2; i++)
1107                 if (ct->fd[i] >= 0)
1108                         para_fd_set(ct->fd[i], &s->rfds, &s->max_fileno);
1109 }
1110
1111 static int command_post_select(struct sched *s, void *context)
1112 {
1113         int ret, i;
1114         struct command_task *ct = context;
1115         static struct timeval last_status_dump;
1116         struct timeval tmp, delay;
1117         bool force = false;
1118
1119         ret = task_get_notification(ct->task);
1120         if (ret < 0)
1121                 return ret;
1122         for (i = 0; i < 2; i++) {
1123                 if (ct->fd[i] < 0)
1124                         continue;
1125                 ret = handle_connect(ct->fd[i], &s->rfds, uid_whitelist);
1126                 if (ret < 0) {
1127                         PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1128                         if (ret == -E_AUDIOD_TERM) {
1129                                 task_notify_all(s, -ret);
1130                                 return ret;
1131                         }
1132                 } else if (ret > 0)
1133                         force = true;
1134         }
1135         if (force == true)
1136                 goto dump;
1137
1138         /* if last status dump was less than 500ms ago, do nothing */
1139         delay.tv_sec = 0;
1140         delay.tv_usec = 500 * 1000;
1141         tv_add(&last_status_dump, &delay, &tmp);
1142         if (tv_diff(now, &tmp, NULL) < 0)
1143                 return 0;
1144
1145         /*
1146          * If last status dump was more than 5s ago, force update. Otherwise,
1147          * update only those items that have changed.
1148          */
1149         delay.tv_sec = 5;
1150         delay.tv_usec = 0;
1151         tv_add(&last_status_dump, &delay, &tmp);
1152         if (tv_diff(now, &tmp, NULL) > 0)
1153                 force = true;
1154 dump:
1155         audiod_status_dump(force);
1156         last_status_dump = *now;
1157         return 1;
1158 }
1159
1160 static void init_command_task(struct command_task *ct)
1161 {
1162         init_local_sockets(ct); /* doesn't return on errors */
1163
1164         ct->task = task_register(&(struct task_info) {
1165                 .name = "command",
1166                 .pre_select = command_pre_select,
1167                 .post_select = command_post_select,
1168                 .context = ct,
1169         }, &sched);
1170 }
1171
1172 static void close_stat_pipe(void)
1173 {
1174         if (!stat_task->ct)
1175                 return;
1176         task_reap(&stat_task->ct->task);
1177         client_close(stat_task->ct);
1178         stat_task->ct = NULL;
1179         clear_and_dump_items();
1180         stat_task->length_seconds = 0;
1181         stat_task->offset_seconds = 0;
1182         stat_task->vss_status = 0;
1183         stat_task->current_audio_format_num = -1;
1184         audiod_status_dump(true);
1185 }
1186
1187 /* avoid busy loop if server is down */
1188 static void set_stat_task_restart_barrier(unsigned seconds)
1189 {
1190         struct timeval delay = {seconds, 0};
1191         tv_add(now, &delay, &stat_task->restart_barrier);
1192 }
1193
1194 static bool must_close_slot(int slot_num)
1195 {
1196         struct slot_info *s = &slot[slot_num];
1197         struct audio_format_info *a = afi + s->format;
1198         int i;
1199
1200         if (s->format < 0)
1201                 return false;
1202         if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1203                 return false;
1204         for (i = 0; i < a->num_filters; i++)
1205                 if (s->fns && task_status(s->fns[i].task) >= 0)
1206                         return false;
1207         if (a->num_writers > 0) {
1208                 for (i = 0; i < a->num_writers; i++)
1209                         if (s->wns && task_status(s->wns[i].task) >= 0)
1210                                 return false;
1211         } else {
1212                 if (s->wns && task_status(s->wns[0].task) >= 0)
1213                         return false;
1214         }
1215         return true;
1216 }
1217
1218 static void close_slot(int slot_num)
1219 {
1220         struct slot_info *s = slot + slot_num;
1221
1222         PARA_INFO_LOG("closing slot %d\n", slot_num);
1223         close_writers(s);
1224         close_filters(s);
1225         close_receiver(slot_num);
1226         clear_slot(slot_num);
1227 }
1228
1229 static void close_unused_slots(void)
1230 {
1231         int i;
1232         bool dump = false;
1233
1234         FOR_EACH_SLOT(i)
1235                 if (must_close_slot(i)) {
1236                         close_slot(i);
1237                         dump = true;
1238                 }
1239         if (dump)
1240                 audiod_status_dump(true);
1241 }
1242
1243 /*
1244  * Cleanup all resources.
1245  *
1246  * This performs various cleanups, removes the audiod socket and closes the
1247  * connection to para_server.
1248  */
1249 static void audiod_cleanup(void)
1250 {
1251         if (socket_name)
1252                 unlink(socket_name);
1253         close_stat_pipe();
1254         close_unused_slots();
1255         audiod_cmdline_parser_free(&conf);
1256         close_stat_clients();
1257         free(uid_whitelist);
1258 }
1259
1260 /*
1261  * Check if any receivers/filters/writers need to be started and do so if
1262  * necessary.
1263  */
1264 static void start_stop_decoders(void)
1265 {
1266         int ret;
1267         struct slot_info *sl;
1268
1269         close_unused_slots();
1270         if (audiod_status != AUDIOD_ON ||
1271                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1272                 return notify_receivers(E_NOT_PLAYING);
1273         if (!must_start_decoder())
1274                 return;
1275         ret = open_receiver(stat_task->current_audio_format_num);
1276         if (ret < 0) {
1277                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1278                 return;
1279         }
1280         sl = slot + ret;
1281         open_filters(sl);
1282         open_writers(sl);
1283         activate_grab_clients(&sched);
1284         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1285         audiod_status_dump(true);
1286 }
1287
1288 static void status_pre_select(struct sched *s, void *context)
1289 {
1290         struct status_task *st = context;
1291         int i, ret, cafn = stat_task->current_audio_format_num;
1292
1293         if (must_start_decoder())
1294                 goto min_delay;
1295         FOR_EACH_SLOT(i)
1296                 if (must_close_slot(i))
1297                         goto min_delay;
1298         ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1299         if (ret > 0)
1300                 goto min_delay;
1301         if (st->ct && audiod_status == AUDIOD_OFF)
1302                 goto min_delay;
1303         if (!st->ct && audiod_status != AUDIOD_OFF)
1304                 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1305         if (cafn >= 0)
1306                 sched_request_barrier(&afi[cafn].restart_barrier, s);
1307         /*
1308          * If para_server is playing we'd like to have a smooth time display
1309          * even if we are running in standby mode. So we request a timeout that
1310          * expires at the next full second.
1311          */
1312         if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1313                 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1314         return;
1315 min_delay:
1316         sched_min_delay(s);
1317 }
1318
1319 /* restart the client task if necessary */
1320 static int status_post_select(struct sched *s, void *context)
1321 {
1322         struct status_task *st = context;
1323         int ret;
1324
1325         ret = task_get_notification(st->task);
1326         if (ret < 0)
1327                 return ret;
1328         if (audiod_status == AUDIOD_OFF) {
1329                 if (!st->ct)
1330                         goto out;
1331                 if (task_status(st->ct->task) >= 0) {
1332                         task_notify(st->ct->task, E_AUDIOD_OFF);
1333                         goto out;
1334                 }
1335                 close_stat_pipe();
1336                 st->clock_diff_count = conf.clock_diff_count_arg;
1337                 goto out;
1338         }
1339         if (st->ct) {
1340                 char *buf;
1341                 size_t sz;
1342
1343                 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1344                 if (ret < 0) {
1345                         close_stat_pipe();
1346                         goto out;
1347                 }
1348                 if (st->ct->status != CL_EXECUTING)
1349                         goto out;
1350                 if (ret == 0) {
1351                         struct timeval diff;
1352                         tv_diff(now, &st->last_status_read, &diff);
1353                         if (diff.tv_sec > 61)
1354                                 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1355                         goto out;
1356                 }
1357                 btr_merge(st->btrn, st->min_iqs);
1358                 sz = btr_next_buffer(st->btrn, &buf);
1359                 ret = for_each_stat_item(buf, sz, update_item);
1360                 if (ret < 0) {
1361                         task_notify(st->ct->task, -ret);
1362                         goto out;
1363                 }
1364                 if (sz != ret) {
1365                         btr_consume(st->btrn, sz - ret);
1366                         st->last_status_read = *now;
1367                         st->min_iqs = 0;
1368                 } else /* current status item crosses buffers */
1369                         st->min_iqs = sz + 1;
1370                 goto out;
1371         }
1372         btr_drain(st->btrn);
1373         st->current_audio_format_num = -1;
1374         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1375                 goto out;
1376         if (st->clock_diff_count) { /* get status only one time */
1377                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1378                 int argc = 5;
1379                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1380                 st->clock_diff_count--;
1381                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1382                 set_stat_task_restart_barrier(2);
1383
1384         } else {
1385                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1386                 int argc = 4;
1387                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1388                 set_stat_task_restart_barrier(5);
1389         }
1390         free(stat_item_values[SI_BASENAME]);
1391         stat_item_values[SI_BASENAME] = para_strdup(
1392                 "no connection to para_server");
1393         stat_client_write_item(SI_BASENAME);
1394         st->last_status_read = *now;
1395 out:
1396         start_stop_decoders();
1397         return 0;
1398 }
1399
1400 static void init_status_task(struct status_task *st)
1401 {
1402         memset(st, 0, sizeof(struct status_task));
1403         st->sa_time_diff_sign = 1;
1404         st->clock_diff_count = conf.clock_diff_count_arg;
1405         st->current_audio_format_num = -1;
1406         st->btrn = btr_new_node(&(struct btr_node_description)
1407                 EMBRACE(.name = "stat"));
1408
1409         stat_task->task = task_register(&(struct task_info) {
1410                 .name = "stat",
1411                 .pre_select = status_pre_select,
1412                 .post_select = status_post_select,
1413                 .context = stat_task,
1414         }, &sched);
1415 }
1416
1417 static void set_initial_status(void)
1418 {
1419         audiod_status = AUDIOD_ON;
1420         if (!conf.mode_given)
1421                 return;
1422         if (!strcmp(conf.mode_arg, "sb")) {
1423                 audiod_status = AUDIOD_STANDBY;
1424                 return;
1425         }
1426         if (!strcmp(conf.mode_arg, "off")) {
1427                 audiod_status = AUDIOD_OFF;
1428                 return;
1429         }
1430         if (strcmp(conf.mode_arg, "on"))
1431                 PARA_WARNING_LOG("invalid mode\n");
1432 }
1433
1434 __noreturn static void print_help_and_die(void)
1435 {
1436         struct ggo_help h = DEFINE_GGO_HELP(audiod);
1437         bool d = conf.detailed_help_given;
1438         unsigned flags;
1439
1440         flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1441         ggo_print_help(&h, flags);
1442
1443         flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1444         print_receiver_helps(flags);
1445         print_filter_helps(flags);
1446         print_writer_helps(flags);
1447         exit(0);
1448 }
1449
1450 /**
1451  * the main function of para_audiod
1452  *
1453  * \param argc usual argument count
1454  * \param argv usual argument vector
1455  *
1456  * \return EXIT_SUCCESS or EXIT_FAILURE
1457  *
1458  * \sa para_audiod(1)
1459  * */
1460 int main(int argc, char *argv[])
1461 {
1462         int ret, i;
1463         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1464         struct audiod_cmdline_parser_params params = {
1465                 .override = 0,
1466                 .initialize = 1,
1467                 .check_required = 0,
1468                 .check_ambiguity = 0,
1469                 .print_errors = 1
1470         };
1471
1472         valid_fd_012();
1473         audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1474         daemon_set_loglevel(conf.loglevel_arg);
1475         version_handle_flag("audiod", conf.version_given);
1476         /* init receivers/filters/writers early to make help work */
1477         recv_init();
1478         filter_init();
1479         writer_init();
1480         if (conf.help_given || conf.detailed_help_given)
1481                 print_help_and_die();
1482         daemon_set_priority(conf.priority_arg);
1483         daemon_drop_privileges_or_die(conf.user_arg, conf.group_arg);
1484         parse_config_or_die();
1485         daemon_init_colors_or_die(conf.color_arg, color_arg_auto, color_arg_no,
1486                 conf.logfile_given, conf.log_color_arg, conf.log_color_given);
1487         init_random_seed_or_die();
1488         daemon_set_flag(DF_LOG_TIME);
1489         daemon_set_flag(DF_LOG_HOSTNAME);
1490         daemon_set_flag(DF_LOG_LL);
1491         if (conf.log_timing_given)
1492                 daemon_set_flag(DF_LOG_TIMING);
1493         if (conf.logfile_given) {
1494                 daemon_set_logfile(conf.logfile_arg);
1495                 daemon_open_log_or_die();
1496         }
1497         ret = parse_stream_args();
1498         if (ret < 0) {
1499                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1500                 exit(EXIT_FAILURE);
1501         }
1502         daemon_log_welcome("audiod");
1503         daemon_set_start_time();
1504         set_initial_status();
1505         FOR_EACH_SLOT(i)
1506                 clear_slot(i);
1507         setup_signal_handling();
1508
1509         init_status_task(stat_task);
1510         init_command_task(cmd_task);
1511
1512         if (conf.daemon_given)
1513                 daemonize(false /* parent exits immediately */);
1514
1515         signal_task->task = task_register(&(struct task_info) {
1516                 .name = "signal",
1517                 .pre_select = signal_pre_select,
1518                 .post_select = signal_post_select,
1519                 .context = signal_task,
1520         }, &sched);
1521
1522         sched.default_timeout.tv_sec = 2;
1523         sched.default_timeout.tv_usec = 999 * 1000;
1524         ret = schedule(&sched);
1525         audiod_cleanup();
1526         sched_shutdown(&sched);
1527         signal_shutdown(signal_task);
1528
1529         if (ret < 0)
1530                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1531         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
1532 }