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;
 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->vss_status & VSS_STATUS_FLAG_PLAYING)) {
 325                 if (stat_task->length_seconds) /* paused */
 326                         return NULL;
 327                 goto empty; /* stopped */
 328         }
 329         /*
 330          * Valid status items and playing, set length and tmp to the stream
 331          * start. We use the slot info and fall back to the info from current
 332          * status items if no slot info is available.
 333          */
 334         length = stat_task->length_seconds;
 335         tmp = &stat_task->server_stream_start;
 336         if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
 337                 btr_get_node_start(s->wns[0].btrn, &wstime);
 338                 if (wstime.tv_sec != 0) { /* writer wrote something */
 339                         if (s->server_stream_start.tv_sec == 0) {
 340                                 /* copy status info to slot */
 341                                 s->server_stream_start = stat_task->server_stream_start;
 342                                 s->offset_seconds = stat_task->offset_seconds;
 343                                 s->seconds_total = stat_task->length_seconds;
 344                         }
 345                         length = s->seconds_total;
 346                         tmp = &s->server_stream_start;
 347                 }
 348         }
 349         if (stat_task->sa_time_diff_sign > 0)
 350                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
 351         else
 352                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
 353         if (!s || !s->wns || !s->wns[0].btrn) {
 354                 struct timeval diff;
 355                 tv_diff(now, &sss, &diff);
 356                 seconds = diff.tv_sec + stat_task->offset_seconds;
 357                 goto out;
 358         }
 359         tv_diff(now, &wstime, &wtime);
 360         //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
 361         seconds = s->offset_seconds;
 362         if (s->receiver_node->btrn) {
 363                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 364                 ret = tv_diff(&rstime, &sss, &rskip);
 365                 if (ret > 0) { /* audiod was started in the middle of the stream */
 366                         tv_add(&wtime, &rskip, &sum);
 367                         seconds += sum.tv_sec;
 368                 } else
 369                         seconds += wtime.tv_sec;
 370         } else
 371                 seconds += wtime.tv_sec;
 372 out:
 373         seconds = PARA_MIN(seconds, length);
 374         seconds = PARA_MAX(seconds, 0);
 375         msg = make_message(
 376                 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
 377                 s? "" : "~",
 378                 seconds / 60,
 379                 seconds % 60,
 380                 (length - seconds) / 60,
 381                 (length - seconds) % 60,
 382                 length? (seconds * 100 + length / 2) / length : 0,
 383                 length / 60,
 384                 length % 60
 385         );
 386         //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
 387         return msg;
 388 empty:
 389         return para_strdup(NULL);
 390 }
 391
 392 static void parse_config_or_die(void)
 393 {
 394         int ret, i;
 395         char *config_file;
 396         struct audiod_cmdline_parser_params params = {
 397                 .override = 0,
 398                 .initialize = 0,
 399                 .check_required = 1,
 400                 .check_ambiguity = 0,
 401                 .print_errors = 1
 402         };
 403
 404         if (conf.config_file_given)
 405                 config_file = para_strdup(conf.config_file_arg);
 406         else {
 407                 char *home = para_homedir();
 408                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 409                 free(home);
 410         }
 411         ret = file_exists(config_file);
 412         if (conf.config_file_given && !ret) {
 413                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 414                 free(config_file);
 415                 goto err;
 416         }
 417         if (ret) {
 418                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 419                 daemon_set_loglevel(conf.loglevel_arg);
 420         }
 421         free(config_file);
 422         if (conf.user_allow_given > 0) {
 423                 uid_whitelist = para_malloc(conf.user_allow_given
 424                         * sizeof(uid_t));
 425                 for (i = 0; i < conf.user_allow_given; i++) {
 426                         int32_t val;
 427                         struct passwd *pw;
 428                         ret = para_atoi32(conf.user_allow_arg[i], &val);
 429                         if (ret >= 0) {
 430                                 uid_whitelist[i] = val;
 431                                 continue;
 432                         }
 433                         errno = 0; /* see getpwnam(3) */
 434                         pw = getpwnam(conf.user_allow_arg[i]);
 435                         if (!pw) {
 436                                 PARA_EMERG_LOG("invalid username: %s\n",
 437                                         conf.user_allow_arg[i]);
 438                                 goto err;
 439                         }
 440                         uid_whitelist[i] = pw->pw_uid;
 441                 }
 442         }
 443         return;
 444 err:
 445         exit(EXIT_FAILURE);
 446 }
 447
 448 static void setup_signal_handling(void)
 449 {
 450         signal_task = signal_init_or_die();
 451         para_install_sighandler(SIGINT);
 452         para_install_sighandler(SIGTERM);
 453         para_install_sighandler(SIGHUP);
 454         para_sigaction(SIGPIPE, SIG_IGN);
 455 }
 456
 457 static void clear_slot(int slot_num)
 458 {
 459         struct slot_info *s = &slot[slot_num];
 460
 461         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 462         memset(s, 0, sizeof(struct slot_info));
 463         s->format = -1;
 464 }
 465
 466 static void close_receiver(int slot_num)
 467 {
 468         struct slot_info *s = &slot[slot_num];
 469         struct audio_format_info *a;
 470
 471         if (s->format < 0 || !s->receiver_node)
 472                 return;
 473         a = &afi[s->format];
 474         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 475                 audio_formats[s->format], slot_num);
 476         a->receiver->close(s->receiver_node);
 477         btr_remove_node(&s->receiver_node->btrn);
 478         task_reap(&s->receiver_node->task);
 479         free(s->receiver_node);
 480         s->receiver_node = NULL;
 481         stat_task->current_audio_format_num = -1;
 482         tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
 483                 &a->restart_barrier);
 484 }
 485
 486 static void writer_cleanup(struct writer_node *wn)
 487 {
 488         struct writer *w;
 489
 490         if (!wn)
 491                 return;
 492         w = writers + wn->writer_num;
 493         PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
 494         w->close(wn);
 495         btr_remove_node(&wn->btrn);
 496         task_reap(&wn->task);
 497 }
 498
 499 static void close_writers(struct slot_info *s)
 500 {
 501         struct audio_format_info *a;
 502         int i;
 503
 504         if (s->format < 0)
 505                 return;
 506         assert(s->wns);
 507         a = afi + s->format;
 508         if (a->num_writers == 0)
 509                 writer_cleanup(s->wns);
 510         else {
 511                 for (i = 0; i < a->num_writers; i++)
 512                         writer_cleanup(s->wns + i);
 513         }
 514         free(s->wns);
 515         s->wns = NULL;
 516 }
 517
 518 static void close_filters(struct slot_info *s)
 519 {
 520         int i;
 521         struct audio_format_info *a = afi + s->format;
 522         if (a->num_filters == 0)
 523                 return;
 524         for (i = a->num_filters - 1; i >= 0; i--) {
 525                 struct filter_node *fn = s->fns + i;
 526                 const struct filter *f;
 527
 528                 if (!fn)
 529                         continue;
 530                 f = filter_get(fn->filter_num);
 531                 if (f->close)
 532                         f->close(fn);
 533                 btr_remove_node(&fn->btrn);
 534                 task_reap(&fn->task);
 535         }
 536         free(s->fns);
 537         s->fns = NULL;
 538 }
 539
 540 static void notify_receivers(int error)
 541 {
 542         int i;
 543
 544         FOR_EACH_SLOT(i) {
 545                 struct slot_info *s = slot + i;
 546                 if (s->format < 0)
 547                         continue;
 548                 if (!s->receiver_node)
 549                         continue;
 550                 task_notify(s->receiver_node->task, error);
 551         }
 552 }
 553
 554 static int get_empty_slot(void)
 555 {
 556         int i;
 557         struct slot_info *s;
 558
 559         FOR_EACH_SLOT(i) {
 560                 s = &slot[i];
 561                 if (s->format < 0) {
 562                         clear_slot(i);
 563                         return i;
 564                 }
 565                 if (s->wns || s->receiver_node || s->fns)
 566                         continue;
 567                 clear_slot(i);
 568                 return i;
 569         }
 570         return -E_NO_MORE_SLOTS;
 571 }
 572
 573 static void open_filters(struct slot_info *s)
 574 {
 575         struct audio_format_info *a = afi + s->format;
 576         struct filter_node *fn;
 577         int nf = a->num_filters;
 578         struct btr_node *parent;
 579         int i;
 580
 581         if (nf == 0)
 582                 return;
 583         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 584         assert(s->fns == NULL);
 585         s->fns = para_calloc(nf * sizeof(struct filter_node));
 586         parent = s->receiver_node->btrn;
 587         for (i = 0; i < nf; i++) {
 588                 char buf[20];
 589                 const struct filter *f = filter_get(a->filter_nums[i]);
 590                 fn = s->fns + i;
 591                 fn->filter_num = a->filter_nums[i];
 592                 fn->conf = a->filter_conf[i];
 593                 fn->btrn = btr_new_node(&(struct btr_node_description)
 594                         EMBRACE(.name = f->name, .parent = parent,
 595                                 .handler = f->execute, .context = fn));
 596
 597                 f->open(fn);
 598                 sprintf(buf, "%s (slot %d)", f->name, (int)(s - slot));
 599                 fn->task = task_register(&(struct task_info) {
 600                         .name = buf,
 601                         .pre_select = f->pre_select,
 602                         .post_select = f->post_select,
 603                         .context = fn,
 604                 }, &sched);
 605                 parent = fn->btrn;
 606                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 607                         audio_formats[s->format], i,  nf, f->name, (int)(s - slot));
 608         }
 609 }
 610
 611 static void open_writers(struct slot_info *s)
 612 {
 613         int i;
 614         struct audio_format_info *a = afi + s->format;
 615         struct writer_node *wn;
 616         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 617
 618         assert(s->wns == NULL);
 619         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 620                 * sizeof(struct writer_node));
 621         for (i = 0; i < a->num_writers; i++) {
 622                 wn = s->wns + i;
 623                 wn->conf = a->writer_conf[i];
 624                 wn->writer_num = a->writer_nums[i];
 625                 register_writer_node(wn, parent, &sched);
 626                 PARA_NOTICE_LOG("%s writer started in slot %d\n",
 627                         writer_names[a->writer_nums[i]], (int)(s - slot));
 628         }
 629 }
 630
 631 /* returns slot num on success */
 632 static int open_receiver(int format)
 633 {
 634         struct audio_format_info *a = &afi[format];
 635         struct slot_info *s;
 636         int ret, slot_num;
 637         struct receiver *r = a->receiver;
 638         struct receiver_node *rn;
 639
 640         tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
 641         ret = get_empty_slot();
 642         if (ret < 0)
 643                 return ret;
 644         slot_num = ret;
 645         rn = para_calloc(sizeof(*rn));
 646         rn->receiver = r;
 647         rn->conf = a->receiver_conf;
 648         rn->btrn = btr_new_node(&(struct btr_node_description)
 649                 EMBRACE(.name = r->name, .context = rn));
 650         ret = r->open(rn);
 651         if (ret < 0) {
 652                 btr_remove_node(&rn->btrn);
 653                 free(rn);
 654                 return ret;
 655         }
 656         s = &slot[slot_num];
 657         s->format = format;
 658         s->receiver_node = rn;
 659         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 660                 audio_formats[format], r->name, slot_num);
 661         rn->task = task_register(&(struct task_info) {
 662                 .name = r->name,
 663                 .pre_select = r->pre_select,
 664                 .post_select = r->post_select,
 665                 .context = rn,
 666         }, &sched);
 667         return slot_num;
 668 }
 669
 670 static bool receiver_running(void)
 671 {
 672         int i;
 673         long unsigned ss1 = stat_task->server_stream_start.tv_sec;
 674
 675         FOR_EACH_SLOT(i) {
 676                 struct slot_info *s = &slot[i];
 677                 long unsigned ss2 = s->server_stream_start.tv_sec;
 678
 679                 if (!s->receiver_node)
 680                         continue;
 681                 if (task_status(s->receiver_node->task) >= 0)
 682                         return true;
 683                 if (ss1 == ss2)
 684                         return true;
 685         }
 686         return false;
 687 }
 688
 689 /**
 690  * Return the root node of the current buffer tree.
 691  *
 692  * This is only used for stream grabbing.
 693  *
 694  * \return \p NULL if no slot is currently active. If more than one buffer tree
 695  * exists, the node corresponding to the most recently started receiver is
 696  * returned.
 697  */
 698 struct btr_node *audiod_get_btr_root(void)
 699 {
 700         int i, newest_slot = -1;
 701         struct timeval newest_rstime = {0, 0};
 702
 703         FOR_EACH_SLOT(i) {
 704                 struct slot_info *s = &slot[i];
 705                 struct timeval rstime;
 706                 if (!s->receiver_node)
 707                         continue;
 708                 if (task_status(s->receiver_node->task) < 0)
 709                         continue;
 710                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 711                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 712                         continue;
 713                 newest_rstime = rstime;
 714                 newest_slot = i;
 715         }
 716         if (newest_slot == -1)
 717                 return NULL;
 718         return slot[newest_slot].receiver_node->btrn;
 719 }
 720
 721 /* whether a new instance of a decoder should be started. */
 722 static bool must_start_decoder(void)
 723 {
 724         int cafn = stat_task->current_audio_format_num;
 725         unsigned vs = stat_task->vss_status;
 726
 727         if (audiod_status != AUDIOD_ON)
 728                 return false;
 729         if (cafn < 0)
 730                 return false;
 731         if (!stat_task->ct)
 732                 return false;
 733         if (vs & VSS_STATUS_FLAG_NEXT)
 734                 return false;
 735         if (!(vs & VSS_STATUS_FLAG_PLAYING))
 736                 return false;
 737         if (receiver_running())
 738                 return false;
 739         if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
 740                 return false;
 741         return true;
 742 }
 743
 744 static void compute_time_diff(const struct timeval *status_time)
 745 {
 746         struct timeval tmp, diff;
 747         static unsigned count;
 748         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 749         const struct timeval max_deviation = {0, 500 * 1000};
 750         const int time_smooth = 5;
 751
 752         sign = tv_diff(status_time, now, &diff);
 753 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 754 //                      sign, sa_time_diff_sign);
 755         if (!count) {
 756                 sa_time_diff_sign = sign;
 757                 stat_task->sa_time_diff = diff;
 758                 count++;
 759                 goto out;
 760         }
 761         if (count > 5) {
 762                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 763                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 764                         PARA_WARNING_LOG("time diff jump: %lims\n",
 765                                 s * tv2ms(&tmp));
 766         }
 767         count++;
 768         sa_time_diff_sign = tv_convex_combination(
 769                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 770                 count > 10? sign : sign * time_smooth, &diff,
 771                 &tmp);
 772         stat_task->sa_time_diff = tmp;
 773         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 774                 sign < 0? "-" : "+",
 775                 tv2ms(&diff),
 776                 sa_time_diff_sign < 0? "-" : "+",
 777                 tv2ms(&stat_task->sa_time_diff)
 778         );
 779 out:
 780         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 781 }
 782
 783 static int update_item(int itemnum, char *buf)
 784 {
 785         long unsigned sec, usec;
 786
 787         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 788                 return 1;
 789         free(stat_item_values[itemnum]);
 790         stat_item_values[itemnum] = para_strdup(buf);
 791         stat_client_write_item(itemnum);
 792         switch (itemnum) {
 793         case SI_STATUS_FLAGS:
 794                 stat_task->vss_status = 0;
 795                 if (strchr(buf, 'N'))
 796                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 797                 if (strchr(buf, 'P'))
 798                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 799                 break;
 800         case SI_OFFSET:
 801                 stat_task->offset_seconds = atoi(buf);
 802                 break;
 803         case SI_SECONDS_TOTAL:
 804                 stat_task->length_seconds = atoi(buf);
 805                 break;
 806         case SI_STREAM_START:
 807                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 808                         stat_task->server_stream_start.tv_sec = sec;
 809                         stat_task->server_stream_start.tv_usec = usec;
 810                 }
 811                 break;
 812         case SI_CURRENT_TIME:
 813                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 814                         struct timeval tv = {sec, usec};
 815                         compute_time_diff(&tv);
 816                 }
 817                 break;
 818         case SI_FORMAT:
 819                 stat_task->current_audio_format_num
 820                         = get_audio_format_num(buf);
 821         }
 822         return 1;
 823 }
 824
 825 static int parse_stream_command(const char *txt, char **cmd)
 826 {
 827         int ret, len;
 828         char *re, *p = strchr(txt, ':');
 829
 830         if (!p)
 831                 return -E_MISSING_COLON;
 832         *cmd = p + 1;
 833         len = p - txt;
 834         re = malloc(len + 1);
 835         strncpy(re, txt, len);
 836         re[len] = '\0';
 837         ret = get_matching_audio_format_nums(re);
 838         free(re);
 839         return ret;
 840 }
 841
 842 static int add_filter(int format, char *cmdline)
 843 {
 844         struct audio_format_info *a = &afi[format];
 845         int filter_num, nf = a->num_filters;
 846         void *cfg;
 847
 848         filter_num = check_filter_arg(cmdline, &cfg);
 849         if (filter_num < 0)
 850                 return filter_num;
 851         a->filter_conf = para_realloc(a->filter_conf,
 852                 (nf + 1) * sizeof(void *));
 853         a->filter_nums = para_realloc(a->filter_nums,
 854                 (nf + 1) * sizeof(unsigned));
 855         a->filter_nums[nf] = filter_num;
 856         a->filter_conf[nf] = cfg;
 857         a->num_filters++;
 858         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 859                 filter_get(filter_num)->name);
 860         return filter_num;
 861 }
 862
 863 static int parse_writer_args(void)
 864 {
 865         int i, ret;
 866         char *cmd;
 867         struct audio_format_info *a;
 868
 869         for (i = 0; i < conf.writer_given; i++) {
 870                 void *wconf;
 871                 int j, nw, writer_num, af_mask;
 872
 873                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 874                 if (ret < 0)
 875                         return ret;
 876                 af_mask = ret;
 877                 FOR_EACH_AUDIO_FORMAT(j) {
 878                         a = afi + j;
 879                         if ((af_mask & (1 << j)) == 0) /* no match */
 880                                 continue;
 881                         wconf = check_writer_arg_or_die(cmd, &writer_num);
 882                         nw = a->num_writers;
 883                         a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
 884                         a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
 885                         a->writer_nums[nw] = writer_num;
 886                         a->writer_conf[nw] = wconf;
 887                         PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
 888                                 nw, writer_names[writer_num]);
 889                         a->num_writers++;
 890                 }
 891         }
 892         /* Use default writer for audio formats which are not yet set up. */
 893         FOR_EACH_AUDIO_FORMAT(i) {
 894                 void *writer_conf;
 895                 int writer_num;
 896                 a = afi + i;
 897                 if (a->num_writers > 0)
 898                         continue; /* already set up */
 899                 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
 900                 a->writer_nums = para_malloc(sizeof(int));
 901                 a->writer_nums[0] = writer_num;
 902                 a->writer_conf = para_malloc(sizeof(void *));
 903                 a->writer_conf[0] = writer_conf;
 904                 a->num_writers = 1;
 905                 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
 906                         writer_names[writer_num]);
 907         }
 908         return 1;
 909 }
 910
 911 static int parse_receiver_args(void)
 912 {
 913         int i, ret, receiver_num;
 914         char *cmd = NULL;
 915         struct audio_format_info *a;
 916
 917         for (i = conf.receiver_given - 1; i >= 0; i--) {
 918                 char *arg;
 919                 int j, af_mask;
 920
 921                 ret = parse_stream_command(conf.receiver_arg[i], &arg);
 922                 if (ret < 0)
 923                         goto out;
 924                 af_mask = ret;
 925                 FOR_EACH_AUDIO_FORMAT(j) {
 926                         a = afi + j;
 927                         if ((af_mask & (1 << j)) == 0) /* no match */
 928                                 continue;
 929                         /*
 930                          * If multiple receivers are given for this audio format, the
 931                          * last one wins and we have to free the previous receiver
 932                          * config here. Since we are iterating backwards, the winning
 933                          * receiver arg is in fact the first one given.
 934                          */
 935                         if (a->receiver_conf)
 936                                 a->receiver->free_config(a->receiver_conf);
 937                         a->receiver_conf = check_receiver_arg(arg, &receiver_num);
 938                         ret = -E_RECV_SYNTAX;
 939                         if (!a->receiver_conf)
 940                                 goto out;
 941                         a->receiver = receivers + receiver_num;
 942                 }
 943         }
 944         /*
 945          * Use the first available receiver with no arguments for those audio
 946          * formats for which no receiver was specified.
 947          */
 948         cmd = para_strdup(receivers[0].name);
 949         FOR_EACH_AUDIO_FORMAT(i) {
 950                 a = &afi[i];
 951                 if (a->receiver_conf)
 952                         continue;
 953                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 954                 if (!a->receiver_conf)
 955                         return -E_RECV_SYNTAX;
 956                 a->receiver = &receivers[receiver_num];
 957         }
 958         FOR_EACH_AUDIO_FORMAT(i) {
 959                 a = afi + i;
 960                 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
 961                         audio_formats[i], a->receiver->name);
 962         }
 963         ret = 1;
 964 out:
 965         free(cmd);
 966         return ret;
 967 }
 968
 969 static int init_default_filters(void)
 970 {
 971         int i, ret = 1;
 972
 973         FOR_EACH_AUDIO_FORMAT(i) {
 974                 struct audio_format_info *a = &afi[i];
 975                 char *tmp;
 976                 int j;
 977
 978                 if (a->num_filters)
 979                         continue; /* no default -- nothing to to */
 980                 /*
 981                  * udp and dccp streams are fec-encoded, so add fecdec as the
 982                  * first filter.
 983                  */
 984                 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
 985                                 strcmp(afi[i].receiver->name, "dccp") == 0) {
 986                         tmp = para_strdup("fecdec");
 987                         add_filter(i, tmp);
 988                         free(tmp);
 989                         if (ret < 0)
 990                                 goto out;
 991                 }
 992                 /* add "dec" to audio format name */
 993                 tmp = make_message("%sdec", audio_formats[i]);
 994                 for (j = 0; filter_get(j); j++)
 995                         if (!strcmp(tmp, filter_get(j)->name))
 996                                 break;
 997                 free(tmp);
 998                 ret = -E_UNSUPPORTED_FILTER;
 999                 if (!filter_get(j))
1000                         goto out;
1001                 tmp = para_strdup(filter_get(j)->name);
1002                 ret = add_filter(i, tmp);
1003                 free(tmp);
1004                 if (ret < 0)
1005                         goto out;
1006                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1007                         filter_get(j)->name);
1008         }
1009 out:
1010         return ret;
1011 }
1012
1013 static int parse_filter_args(void)
1014 {
1015         int i, j, ret, af_mask, num_matches;
1016
1017         for (i = 0; i < conf.filter_given; i++) {
1018                 char *arg;
1019                 ret = parse_stream_command(conf.filter_arg[i], &arg);
1020                 if (ret < 0)
1021                         goto out;
1022                 af_mask = ret;
1023                 num_matches = 0;
1024                 FOR_EACH_AUDIO_FORMAT(j) {
1025                         if ((af_mask & (1 << j)) == 0) /* no match */
1026                                 continue;
1027                         ret = add_filter(j, arg);
1028                         if (ret < 0)
1029                                 goto out;
1030                         num_matches++;
1031                 }
1032                 if (num_matches == 0)
1033                         PARA_WARNING_LOG("ignoring filter spec: %s\n",
1034                                 conf.filter_arg[i]);
1035         }
1036         ret = init_default_filters(); /* use default values for the rest */
1037 out:
1038         return ret;
1039 }
1040
1041 static int parse_stream_args(void)
1042 {
1043         int ret;
1044
1045         ret = parse_receiver_args();
1046         if (ret < 0)
1047                 return ret;
1048         ret = parse_filter_args();
1049         if (ret < 0)
1050                 return ret;
1051         ret = parse_writer_args();
1052         if (ret < 0)
1053                 return ret;
1054         return 1;
1055 }
1056
1057 /* does not unlink socket on errors */
1058 static void init_local_sockets(struct command_task *ct)
1059 {
1060         if (conf.socket_given)
1061                 socket_name = para_strdup(conf.socket_arg);
1062         else {
1063                 char *hn = para_hostname();
1064                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1065                         hn);
1066                 free(hn);
1067         }
1068         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
1069         if (conf.force_given)
1070                 unlink(socket_name);
1071         ct->fd[0] = create_local_socket(socket_name, 0);
1072         ct->fd[1] = create_local_socket(socket_name,
1073                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1074         if (ct->fd[0] >= 0 || ct->fd[1] >= 0)
1075                 return;
1076         PARA_EMERG_LOG("%s\n", para_strerror(-ct->fd[1]));
1077         exit(EXIT_FAILURE);
1078 }
1079
1080 static int signal_post_select(struct sched *s, void *context)
1081 {
1082         struct signal_task *st = context;
1083         int ret, signum;
1084
1085         ret = task_get_notification(st->task);
1086         if (ret < 0)
1087                 return ret;
1088         signum = para_next_signal(&s->rfds);
1089         switch (signum) {
1090         case SIGINT:
1091         case SIGTERM:
1092         case SIGHUP:
1093                 PARA_NOTICE_LOG("received signal %d\n", signum);
1094                 task_notify_all(s, E_AUDIOD_SIGNAL);
1095                 return -E_AUDIOD_SIGNAL;
1096         }
1097         return 0;
1098 }
1099
1100 static void command_pre_select(struct sched *s, void *context)
1101 {
1102         struct command_task *ct = context;
1103         int i;
1104
1105         for (i = 0; i < 2; i++)
1106                 if (ct->fd[i] >= 0)
1107                         para_fd_set(ct->fd[i], &s->rfds, &s->max_fileno);
1108 }
1109
1110 static int command_post_select(struct sched *s, void *context)
1111 {
1112         int ret, i;
1113         struct command_task *ct = context;
1114         static struct timeval last_status_dump;
1115         struct timeval tmp, delay;
1116         bool force = false;
1117
1118         ret = task_get_notification(ct->task);
1119         if (ret < 0)
1120                 return ret;
1121         for (i = 0; i < 2; i++) {
1122                 if (ct->fd[i] < 0)
1123                         continue;
1124                 ret = handle_connect(ct->fd[i], &s->rfds, uid_whitelist);
1125                 if (ret < 0) {
1126                         PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1127                         if (ret == -E_AUDIOD_TERM) {
1128                                 task_notify_all(s, -ret);
1129                                 return ret;
1130                         }
1131                 } else if (ret > 0)
1132                         force = true;
1133         }
1134         if (force == true)
1135                 goto dump;
1136
1137         /* if last status dump was less than 500ms ago, do nothing */
1138         delay.tv_sec = 0;
1139         delay.tv_usec = 500 * 1000;
1140         tv_add(&last_status_dump, &delay, &tmp);
1141         if (tv_diff(now, &tmp, NULL) < 0)
1142                 return 0;
1143
1144         /*
1145          * If last status dump was more than 5s ago, force update. Otherwise,
1146          * update only those items that have changed.
1147          */
1148         delay.tv_sec = 5;
1149         delay.tv_usec = 0;
1150         tv_add(&last_status_dump, &delay, &tmp);
1151         if (tv_diff(now, &tmp, NULL) > 0)
1152                 force = true;
1153 dump:
1154         audiod_status_dump(force);
1155         last_status_dump = *now;
1156         return 1;
1157 }
1158
1159 static void init_command_task(struct command_task *ct)
1160 {
1161         init_local_sockets(ct); /* doesn't return on errors */
1162
1163         ct->task = task_register(&(struct task_info) {
1164                 .name = "command",
1165                 .pre_select = command_pre_select,
1166                 .post_select = command_post_select,
1167                 .context = ct,
1168         }, &sched);
1169 }
1170
1171 static void close_stat_pipe(void)
1172 {
1173         if (!stat_task->ct)
1174                 return;
1175         task_reap(&stat_task->ct->task);
1176         client_close(stat_task->ct);
1177         stat_task->ct = NULL;
1178         clear_and_dump_items();
1179         stat_task->length_seconds = 0;
1180         stat_task->offset_seconds = 0;
1181         stat_task->vss_status = 0;
1182         stat_task->current_audio_format_num = -1;
1183         audiod_status_dump(true);
1184 }
1185
1186 /* avoid busy loop if server is down */
1187 static void set_stat_task_restart_barrier(unsigned seconds)
1188 {
1189         struct timeval delay = {seconds, 0};
1190         tv_add(now, &delay, &stat_task->restart_barrier);
1191 }
1192
1193 static bool must_close_slot(int slot_num)
1194 {
1195         struct slot_info *s = &slot[slot_num];
1196         struct audio_format_info *a = afi + s->format;
1197         int i;
1198
1199         if (s->format < 0)
1200                 return false;
1201         if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1202                 return false;
1203         for (i = 0; i < a->num_filters; i++)
1204                 if (s->fns && task_status(s->fns[i].task) >= 0)
1205                         return false;
1206         if (a->num_writers > 0) {
1207                 for (i = 0; i < a->num_writers; i++)
1208                         if (s->wns && task_status(s->wns[i].task) >= 0)
1209                                 return false;
1210         } else {
1211                 if (s->wns && task_status(s->wns[0].task) >= 0)
1212                         return false;
1213         }
1214         return true;
1215 }
1216
1217 static void close_slot(int slot_num)
1218 {
1219         struct slot_info *s = slot + slot_num;
1220
1221         PARA_INFO_LOG("closing slot %d\n", slot_num);
1222         close_writers(s);
1223         close_filters(s);
1224         close_receiver(slot_num);
1225         clear_slot(slot_num);
1226 }
1227
1228 static void close_unused_slots(void)
1229 {
1230         int i;
1231
1232         FOR_EACH_SLOT(i)
1233                 if (must_close_slot(i))
1234                         close_slot(i);
1235 }
1236
1237 /*
1238  * Cleanup all resources.
1239  *
1240  * This performs various cleanups, removes the audiod socket and closes the
1241  * connection to para_server.
1242  */
1243 static void audiod_cleanup(void)
1244 {
1245         if (socket_name)
1246                 unlink(socket_name);
1247         close_stat_pipe();
1248         close_unused_slots();
1249         audiod_cmdline_parser_free(&conf);
1250         close_stat_clients();
1251         free(uid_whitelist);
1252 }
1253
1254 /*
1255  * Check if any receivers/filters/writers need to be started and do so if
1256  * necessary.
1257  */
1258 static void start_stop_decoders(void)
1259 {
1260         int ret;
1261         struct slot_info *sl;
1262
1263         close_unused_slots();
1264         if (audiod_status != AUDIOD_ON ||
1265                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1266                 return notify_receivers(E_NOT_PLAYING);
1267         if (!must_start_decoder())
1268                 return;
1269         ret = open_receiver(stat_task->current_audio_format_num);
1270         if (ret < 0) {
1271                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1272                 return;
1273         }
1274         sl = slot + ret;
1275         open_filters(sl);
1276         open_writers(sl);
1277         activate_grab_clients(&sched);
1278         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1279 }
1280
1281 static void status_pre_select(struct sched *s, void *context)
1282 {
1283         struct status_task *st = context;
1284         int i, ret, cafn = stat_task->current_audio_format_num;
1285
1286         if (must_start_decoder())
1287                 goto min_delay;
1288         FOR_EACH_SLOT(i)
1289                 if (must_close_slot(i))
1290                         goto min_delay;
1291         ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1292         if (ret > 0)
1293                 goto min_delay;
1294         if (st->ct && audiod_status == AUDIOD_OFF)
1295                 goto min_delay;
1296         if (!st->ct && audiod_status != AUDIOD_OFF)
1297                 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1298         if (cafn >= 0)
1299                 sched_request_barrier(&afi[cafn].restart_barrier, s);
1300         /*
1301          * If para_server is playing we'd like to have a smooth time display
1302          * even if we are running in standby mode. So we request a timeout that
1303          * expires at the next full second.
1304          */
1305         if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1306                 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1307         return;
1308 min_delay:
1309         sched_min_delay(s);
1310 }
1311
1312 /* restart the client task if necessary */
1313 static int status_post_select(struct sched *s, void *context)
1314 {
1315         struct status_task *st = context;
1316         int ret;
1317
1318         ret = task_get_notification(st->task);
1319         if (ret < 0)
1320                 return ret;
1321         if (audiod_status == AUDIOD_OFF) {
1322                 if (!st->ct)
1323                         goto out;
1324                 if (task_status(st->ct->task) >= 0) {
1325                         task_notify(st->ct->task, E_AUDIOD_OFF);
1326                         goto out;
1327                 }
1328                 close_stat_pipe();
1329                 st->clock_diff_count = conf.clock_diff_count_arg;
1330                 goto out;
1331         }
1332         if (st->ct) {
1333                 char *buf;
1334                 size_t sz;
1335
1336                 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1337                 if (ret < 0) {
1338                         close_stat_pipe();
1339                         goto out;
1340                 }
1341                 if (st->ct->status != CL_EXECUTING)
1342                         goto out;
1343                 if (ret == 0) {
1344                         struct timeval diff;
1345                         tv_diff(now, &st->last_status_read, &diff);
1346                         if (diff.tv_sec > 61)
1347                                 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1348                         goto out;
1349                 }
1350                 btr_merge(st->btrn, st->min_iqs);
1351                 sz = btr_next_buffer(st->btrn, &buf);
1352                 ret = for_each_stat_item(buf, sz, update_item);
1353                 if (ret < 0) {
1354                         task_notify(st->ct->task, -ret);
1355                         goto out;
1356                 }
1357                 if (sz != ret) {
1358                         btr_consume(st->btrn, sz - ret);
1359                         st->last_status_read = *now;
1360                         st->min_iqs = 0;
1361                 } else /* current status item crosses buffers */
1362                         st->min_iqs = sz + 1;
1363                 goto out;
1364         }
1365         btr_drain(st->btrn);
1366         st->current_audio_format_num = -1;
1367         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1368                 goto out;
1369         if (st->clock_diff_count) { /* get status only one time */
1370                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1371                 int argc = 5;
1372                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1373                 st->clock_diff_count--;
1374                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1375                 set_stat_task_restart_barrier(2);
1376
1377         } else {
1378                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1379                 int argc = 4;
1380                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1381                 set_stat_task_restart_barrier(5);
1382         }
1383         free(stat_item_values[SI_BASENAME]);
1384         stat_item_values[SI_BASENAME] = para_strdup(
1385                 "no connection to para_server");
1386         stat_client_write_item(SI_BASENAME);
1387         st->last_status_read = *now;
1388 out:
1389         start_stop_decoders();
1390         return 0;
1391 }
1392
1393 static void init_status_task(struct status_task *st)
1394 {
1395         memset(st, 0, sizeof(struct status_task));
1396         st->sa_time_diff_sign = 1;
1397         st->clock_diff_count = conf.clock_diff_count_arg;
1398         st->current_audio_format_num = -1;
1399         st->btrn = btr_new_node(&(struct btr_node_description)
1400                 EMBRACE(.name = "stat"));
1401
1402         stat_task->task = task_register(&(struct task_info) {
1403                 .name = "stat",
1404                 .pre_select = status_pre_select,
1405                 .post_select = status_post_select,
1406                 .context = stat_task,
1407         }, &sched);
1408 }
1409
1410 static void set_initial_status(void)
1411 {
1412         audiod_status = AUDIOD_ON;
1413         if (!conf.mode_given)
1414                 return;
1415         if (!strcmp(conf.mode_arg, "sb")) {
1416                 audiod_status = AUDIOD_STANDBY;
1417                 return;
1418         }
1419         if (!strcmp(conf.mode_arg, "off")) {
1420                 audiod_status = AUDIOD_OFF;
1421                 return;
1422         }
1423         if (strcmp(conf.mode_arg, "on"))
1424                 PARA_WARNING_LOG("invalid mode\n");
1425 }
1426
1427 __noreturn static void print_help_and_die(void)
1428 {
1429         struct ggo_help h = DEFINE_GGO_HELP(audiod);
1430         bool d = conf.detailed_help_given;
1431         unsigned flags;
1432
1433         flags = d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS;
1434         ggo_print_help(&h, flags);
1435
1436         flags = d? GPH_MODULE_FLAGS_DETAILED : GPH_MODULE_FLAGS;
1437         print_receiver_helps(flags);
1438         print_filter_helps(flags);
1439         print_writer_helps(flags);
1440         exit(0);
1441 }
1442
1443 /**
1444  * the main function of para_audiod
1445  *
1446  * \param argc usual argument count
1447  * \param argv usual argument vector
1448  *
1449  * \return EXIT_SUCCESS or EXIT_FAILURE
1450  *
1451  * \sa para_audiod(1)
1452  * */
1453 int main(int argc, char *argv[])
1454 {
1455         int ret, i;
1456         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1457         struct audiod_cmdline_parser_params params = {
1458                 .override = 0,
1459                 .initialize = 1,
1460                 .check_required = 0,
1461                 .check_ambiguity = 0,
1462                 .print_errors = 1
1463         };
1464
1465         valid_fd_012();
1466         audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1467         daemon_set_loglevel(conf.loglevel_arg);
1468         version_handle_flag("audiod", conf.version_given);
1469         /* init receivers/filters/writers early to make help work */
1470         recv_init();
1471         filter_init();
1472         writer_init();
1473         if (conf.help_given || conf.detailed_help_given)
1474                 print_help_and_die();
1475         daemon_set_priority(conf.priority_arg);
1476         daemon_drop_privileges_or_die(conf.user_arg, conf.group_arg);
1477         parse_config_or_die();
1478         daemon_init_colors_or_die(conf.color_arg, color_arg_auto, color_arg_no,
1479                 conf.logfile_given, conf.log_color_arg, conf.log_color_given);
1480         init_random_seed_or_die();
1481         daemon_set_flag(DF_LOG_TIME);
1482         daemon_set_flag(DF_LOG_HOSTNAME);
1483         daemon_set_flag(DF_LOG_LL);
1484         if (conf.log_timing_given)
1485                 daemon_set_flag(DF_LOG_TIMING);
1486         if (conf.logfile_given) {
1487                 daemon_set_logfile(conf.logfile_arg);
1488                 daemon_open_log_or_die();
1489         }
1490         ret = parse_stream_args();
1491         if (ret < 0) {
1492                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1493                 exit(EXIT_FAILURE);
1494         }
1495         daemon_log_welcome("audiod");
1496         daemon_set_start_time();
1497         set_initial_status();
1498         FOR_EACH_SLOT(i)
1499                 clear_slot(i);
1500         setup_signal_handling();
1501
1502         init_status_task(stat_task);
1503         init_command_task(cmd_task);
1504
1505         if (conf.daemon_given)
1506                 daemonize(false /* parent exits immediately */);
1507
1508         signal_task->task = task_register(&(struct task_info) {
1509                 .name = "signal",
1510                 .pre_select = signal_pre_select,
1511                 .post_select = signal_post_select,
1512                 .context = signal_task,
1513         }, &sched);
1514
1515         sched.default_timeout.tv_sec = 2;
1516         sched.default_timeout.tv_usec = 999 * 1000;
1517         ret = schedule(&sched);
1518         audiod_cleanup();
1519         sched_shutdown(&sched);
1520         signal_shutdown(signal_task);
1521
1522         if (ret < 0)
1523                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1524         return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
1525 }