audiod.c

   1 /*
   2  * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file audiod.c the paraslash's audio daemon */
   8 #include <regex.h>
   9 #include <sys/types.h>
  10 #include <dirent.h>
  11 #include <signal.h>
  12 #include <openssl/rc4.h>
  13 #include <stdbool.h>
  14
  15 #include "para.h"
  16 #include "error.h"
  17 #include "crypt.h"
  18 #include "audiod.cmdline.h"
  19 #include "list.h"
  20 #include "sched.h"
  21 #include "ggo.h"
  22 #include "recv.h"
  23 #include "buffer_tree.h"
  24 #include "filter.h"
  25 #include "grab_client.h"
  26 #include "client.cmdline.h"
  27 #include "client.h"
  28 #include "audiod.h"
  29 #include "net.h"
  30 #include "daemon.h"
  31 #include "string.h"
  32 #include "fd.h"
  33 #include "write.h"
  34 #include "write_common.h"
  35 #include "signal.h"
  36
  37 /** define the array of error lists needed by para_audiod */
  38 INIT_AUDIOD_ERRLISTS;
  39 /** define the array containing all supported audio formats */
  40 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
  41
  42 /** Defines how audiod handles one supported audio format. */
  43 struct audio_format_info {
  44         /** pointer to the receiver for this audio format */
  45         struct receiver *receiver;
  46         /** the receiver configuration */
  47         void *receiver_conf;
  48         /** the number of filters that should be activated for this audio format */
  49         unsigned int num_filters;
  50         /** Array of filter numbers to be activated. */
  51         unsigned *filter_nums;
  52         /** Pointer to the array of filter configurations. */
  53         void **filter_conf;
  54         /** the number of filters that should be activated for this audio format */
  55         unsigned int num_writers;
  56         /** Array of writer numbers to be activated. */
  57         int *writer_nums;
  58         /** pointer to the array of writer configurations */
  59         void **writer_conf;
  60         /** do not start receiver/filters/writer before this time */
  61         struct timeval restart_barrier;
  62 };
  63
  64 /**
  65  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  66  * be associated with a receiver/filter/writer triple. This array holds all
  67  * information on the status of these slots.
  68  *
  69  * \sa struct slot_info
  70  * */
  71 struct slot_info slot[MAX_STREAM_SLOTS];
  72
  73 /** The vss status flags audiod is interested in. */
  74 enum vss_status_flags {
  75         /** Whether the 'N' flag is set. */
  76         VSS_STATUS_FLAG_NEXT = 1,
  77         /** The 'P' flag is set. */
  78         VSS_STATUS_FLAG_PLAYING = 2,
  79 };
  80
  81 /**
  82  * The task for obtaining para_server's status (para_client stat).
  83  *
  84  * \sa struct task, struct sched.
  85  */
  86 struct status_task {
  87         /** The associated task structure of audiod. */
  88         struct task task;
  89         /** Client data associated with the stat task. */
  90         struct client_task *ct;
  91         /** Do not restart client command until this time. */
  92         struct timeval restart_barrier;
  93         /** Last time we received status data from para_server. */
  94         struct timeval last_status_read;
  95         /** The offset value announced by para_server. */
  96         int offset_seconds;
  97         /** The length of the current audio file as announced by para_server. */
  98         int length_seconds;
  99         /** The start of the current stream from the view of para_server. */
 100         struct timeval server_stream_start;
 101         /** The average time deviation between para_server and para_audiod. */
 102         struct timeval sa_time_diff;
 103         /** Whether client time is ahead of server time. */
 104         int sa_time_diff_sign;
 105         /** The 'P' and the 'N' flags as announced by para_server. */
 106         enum vss_status_flags vss_status;
 107         /** Number of times the clock difference is to be checked. */
 108         unsigned clock_diff_count;
 109         /** When to start the next check for clock difference. */
 110         struct timeval clock_diff_barrier;
 111         /** Number of the audio format as announced by para_server. */
 112         int current_audio_format_num;
 113 };
 114
 115 /** The array of status items sent by para_server. */
 116 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
 117
 118 /**
 119  * the current mode of operation of which can be changed by the on/off/cycle
 120  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
 121  */
 122 int audiod_status = AUDIOD_ON;
 123
 124 /**
 125  * the gengetopt args_info struct that holds information on all command line
 126  * arguments
 127  */
 128 struct audiod_args_info conf;
 129
 130 static char *socket_name;
 131 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 132
 133 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
 134
 135 static struct status_task status_task_struct;
 136
 137 /**
 138  * the task that calls the status command of para_server
 139  *
 140  * \sa struct status_task
 141  */
 142 static struct status_task *stat_task = &status_task_struct;
 143 static struct timeval initial_delay_barrier;
 144
 145 /**
 146  * the task for handling audiod commands
 147  *
 148  * \sa struct task, struct sched
 149  */
 150 struct command_task {
 151         /** the local listening socket */
 152         int fd;
 153         /** the associated task structure */
 154         struct task task;
 155 };
 156
 157 /** iterate over all supported audio formats */
 158 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 159
 160 /**
 161  * get the audio format number
 162  * \param name the name of the audio format
 163  *
 164  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 165  * \a name is not a supported audio format.
 166  */
 167 int get_audio_format_num(const char *name)
 168 {
 169         int i;
 170
 171         while (para_isspace(*name))
 172                 name++;
 173         FOR_EACH_AUDIO_FORMAT(i)
 174                 if (!strcmp(name, audio_formats[i]))
 175                         return i;
 176         return -E_UNSUPPORTED_AUDIO_FORMAT;
 177 }
 178
 179 char *get_time_string(int slot_num)
 180 {
 181         int ret, seconds = 0, length;
 182         struct timeval *tmp, sum, sss, /* server stream start */
 183                 rstime, /* receiver start time */
 184                 wstime, /* writer start time */
 185                 wtime, /* now - writer start */
 186                 rskip; /* receiver start - sss */
 187         struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
 188         char *msg;
 189
 190         if (audiod_status == AUDIOD_OFF)
 191                 goto empty;
 192         if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
 193                 if (stat_task->length_seconds) /* paused */
 194                         return NULL;
 195                 goto empty; /* stopped */
 196         }
 197         if (audiod_status == AUDIOD_ON && !s)
 198                 goto empty;
 199         /*
 200          * Valid status items and playing, set length and tmp to the stream
 201          * start. We use the slot info and fall back to the info from current
 202          * status items if no slot info is available.
 203          */
 204         length = stat_task->length_seconds;
 205         tmp = &stat_task->server_stream_start;
 206         if (s && s->wns) { /* writer active in this slot */
 207                 btr_get_node_start(s->wns[0].btrn, &wstime);
 208                 if (wstime.tv_sec != 0) { /* writer wrote something */
 209                         if (s->server_stream_start.tv_sec == 0) {
 210                                 /* copy status info to slot */
 211                                 s->server_stream_start = stat_task->server_stream_start;
 212                                 s->offset_seconds = stat_task->offset_seconds;
 213                                 s->seconds_total = stat_task->length_seconds;
 214                         }
 215                         length = s->seconds_total;
 216                         tmp = &s->server_stream_start;
 217                 }
 218         }
 219         if (stat_task->sa_time_diff_sign > 0)
 220                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
 221         else
 222                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
 223         if (!s || !s->wns) {
 224                 struct timeval diff;
 225                 tv_diff(now, &sss, &diff);
 226                 seconds = diff.tv_sec + stat_task->offset_seconds;
 227                 goto out;
 228         }
 229         tv_diff(now, &wstime, &wtime);
 230         //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
 231         seconds = s->offset_seconds;
 232         btr_get_node_start(s->receiver_node->btrn, &rstime);
 233         ret = tv_diff(&rstime, &sss, &rskip);
 234         if (ret > 0) { /* audiod was started in the middle of the stream */
 235                 tv_add(&wtime, &rskip, &sum);
 236                 seconds += sum.tv_sec;
 237         } else
 238                 seconds += wtime.tv_sec;
 239 out:
 240         seconds = PARA_MIN(seconds, length);
 241         seconds = PARA_MAX(seconds, 0);
 242         msg = make_message(
 243                 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
 244                 s? "" : "~",
 245                 seconds / 60,
 246                 seconds % 60,
 247                 (length - seconds) / 60,
 248                 (length - seconds) % 60,
 249                 length? (seconds * 100 + length / 2) / length : 0,
 250                 length / 60,
 251                 length % 60
 252         );
 253         PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
 254         return msg;
 255 empty:
 256         return para_strdup(NULL);
 257 }
 258
 259 static int want_colors(void)
 260 {
 261         if (conf.color_arg == color_arg_no)
 262                 return 0;
 263         if (conf.color_arg == color_arg_yes)
 264                 return 1;
 265         if (conf.logfile_given)
 266                 return 0;
 267         return isatty(STDERR_FILENO);
 268 }
 269
 270 static void parse_config_or_die(void)
 271 {
 272         int ret;
 273         char *config_file;
 274         struct audiod_cmdline_parser_params params = {
 275                 .override = 0,
 276                 .initialize = 0,
 277                 .check_required = 1,
 278                 .check_ambiguity = 0,
 279                 .print_errors = 1
 280         };
 281
 282         if (conf.config_file_given)
 283                 config_file = para_strdup(conf.config_file_arg);
 284         else {
 285                 char *home = para_homedir();
 286                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 287                 free(home);
 288         }
 289         ret = file_exists(config_file);
 290         if (conf.config_file_given && !ret) {
 291                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 292                 goto err;
 293         }
 294         if (ret)
 295                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 296         free(config_file);
 297         daemon_set_loglevel(conf.loglevel_arg);
 298         return;
 299 err:
 300         free(config_file);
 301         exit(EXIT_FAILURE);
 302 }
 303
 304 static void setup_signal_handling(void)
 305 {
 306         sig_task->fd = para_signal_init();
 307         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 308         para_install_sighandler(SIGINT);
 309         para_install_sighandler(SIGTERM);
 310         para_install_sighandler(SIGHUP);
 311         para_sigaction(SIGPIPE, SIG_IGN);
 312 }
 313
 314 static void clear_slot(int slot_num)
 315 {
 316         struct slot_info *s = &slot[slot_num];
 317
 318         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 319         memset(s, 0, sizeof(struct slot_info));
 320         s->format = -1;
 321 }
 322
 323 static void close_receiver(int slot_num)
 324 {
 325         struct slot_info *s = &slot[slot_num];
 326         struct audio_format_info *a;
 327         struct timeval restart_delay = {0, 200 * 1000};
 328
 329         if (s->format < 0 || !s->receiver_node)
 330                 return;
 331         a = &afi[s->format];
 332         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 333                 audio_formats[s->format], slot_num);
 334         a->receiver->close(s->receiver_node);
 335         btr_free_node(s->receiver_node->btrn);
 336         free(s->receiver_node);
 337         s->receiver_node = NULL;
 338         tv_add(now, &restart_delay, &afi[s->format].restart_barrier);
 339 }
 340
 341 static void writer_cleanup(struct writer_node *wn)
 342 {
 343         struct writer *w;
 344
 345         if (!wn)
 346                 return;
 347         w = writers + wn->writer_num;
 348         PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
 349         w->close(wn);
 350         btr_free_node(wn->btrn);
 351 }
 352
 353 static void close_writers(struct slot_info *s)
 354 {
 355         struct audio_format_info *a;
 356         int i;
 357
 358         if (s->format < 0)
 359                 return;
 360         a = afi + s->format;
 361         if (a->num_writers == 0)
 362                 writer_cleanup(s->wns);
 363         else {
 364                 for (i = 0; i < a->num_writers; i++)
 365                         writer_cleanup(s->wns + i);
 366         }
 367         free(s->wns);
 368         s->wns = NULL;
 369 }
 370
 371 static void close_filters(struct slot_info *s)
 372 {
 373         int i;
 374         struct audio_format_info *a = afi + s->format;
 375         if (a->num_filters == 0)
 376                 return;
 377         for (i = 0; i < a->num_filters; i++) {
 378                 struct filter_node *fn = s->fns + i;
 379                 struct filter *f;
 380
 381                 if (!fn)
 382                         continue;
 383                 f = filters + fn->filter_num;
 384                 f->close(fn);
 385                 btr_free_node(fn->btrn);
 386         }
 387         free(s->fns);
 388         s->fns = NULL;
 389 }
 390
 391 static void kill_all_decoders(int error)
 392 {
 393         int i, j;
 394
 395         FOR_EACH_SLOT(i) {
 396                 struct slot_info *s = &slot[i];
 397                 struct audio_format_info *a;
 398                 if (s->format < 0)
 399                         continue;
 400                 a = afi + s->format;
 401                 if (s->wns)
 402                         for (j = 0; j < a->num_writers; j++)
 403                                 s->wns[j].task.error = error;
 404                 if (s->fns)
 405                         for (j = 0; j < a->num_writers; j++)
 406                                 s->fns[j].task.error = error;
 407                 if (s->receiver_node)
 408                         s->receiver_node->task.error = error;
 409         }
 410 }
 411
 412 static int get_empty_slot(void)
 413 {
 414         int i;
 415         struct slot_info *s;
 416
 417         FOR_EACH_SLOT(i) {
 418                 s = &slot[i];
 419                 if (s->format < 0) {
 420                         clear_slot(i);
 421                         return i;
 422                 }
 423                 if (s->wns || s->receiver_node || s->fns)
 424                         continue;
 425                 clear_slot(i);
 426                 return i;
 427         }
 428         return -E_NO_MORE_SLOTS;
 429 }
 430
 431 /**
 432  * get the number of filters
 433  *
 434  * \param audio_format_num the number identifying the audio format
 435  *
 436  * \return the number of filters for the given audio format
 437  *
 438  * \sa struct filter;
 439  */
 440 int num_filters(int audio_format_num)
 441 {
 442         return afi[audio_format_num].num_filters;
 443 }
 444
 445 static void open_filters(struct slot_info *s)
 446 {
 447         struct audio_format_info *a = afi + s->format;
 448         struct filter_node *fn;
 449         int nf = a->num_filters;
 450         struct btr_node *parent;
 451         int i;
 452
 453         if (nf == 0)
 454                 return;
 455         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 456         assert(s->fns == NULL);
 457         s->fns = para_calloc(nf * sizeof(struct filter_node));
 458         parent = s->receiver_node->btrn;
 459         for (i = 0; i < nf; i++) {
 460                 struct filter *f = filters + a->filter_nums[i];
 461                 fn = s->fns + i;
 462                 fn->filter_num = a->filter_nums[i];
 463                 fn->conf = a->filter_conf[i];
 464                 fn->task.pre_select = f->pre_select;
 465                 fn->task.post_select = f->post_select;
 466                 fn->btrn = btr_new_node(f->name, parent, f->execute, fn);
 467                 f->open(fn);
 468                 register_task(&fn->task);
 469                 parent = fn->btrn;
 470                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 471                         audio_formats[s->format], i,  nf, f->name, s - slot);
 472                 sprintf(fn->task.status, "%s (slot %d)", f->name, s - slot);
 473         }
 474 }
 475
 476 static void open_writers(struct slot_info *s)
 477 {
 478         int i;
 479         struct audio_format_info *a = afi + s->format;
 480         struct writer_node *wn;
 481         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 482
 483         assert(s->wns == NULL);
 484         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 485                 * sizeof(struct writer_node));
 486         if (a->num_writers == 0)
 487                 setup_writer_node(NULL, parent, s->wns);
 488         else {
 489                 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 490                 for (i = 0; i < a->num_writers; i++) {
 491                         wn = s->wns + i;
 492                         wn->conf = a->writer_conf[i];
 493                         wn->writer_num = a->writer_nums[i];
 494                         register_writer_node(wn, parent);
 495                 }
 496         }
 497 }
 498
 499 /* returns slot num on success */
 500 static int open_receiver(int format)
 501 {
 502         struct audio_format_info *a = &afi[format];
 503         struct slot_info *s;
 504         int ret, slot_num;
 505         struct receiver *r = a->receiver;
 506         struct receiver_node *rn;
 507         const struct timeval restart_delay = {2, 0};
 508
 509         ret = get_empty_slot();
 510         if (ret < 0)
 511                 goto err;
 512         slot_num = ret;
 513         s = &slot[slot_num];
 514         s->format = format;
 515         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 516         rn = s->receiver_node;
 517         rn->receiver = r;
 518         rn->conf = a->receiver_conf;
 519         rn->btrn = btr_new_node(r->name, NULL, NULL, rn);
 520         ret = r->open(rn);
 521         if (ret < 0) {
 522                 btr_free_node(rn->btrn);
 523                 free(rn);
 524                 s->receiver_node = NULL;
 525                 goto err;
 526         }
 527         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 528                 audio_formats[s->format], r->name, slot_num);
 529         rn->task.pre_select = r->pre_select;
 530         rn->task.post_select = r->post_select;
 531         sprintf(rn->task.status, "%s receiver node", r->name);
 532         register_task(&rn->task);
 533         ret = slot_num;
 534 err:
 535         if (ret < 0)
 536                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 537         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 538         return ret;
 539 }
 540
 541 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
 542 static int receiver_running(int format)
 543 {
 544         int i, ret = 0;
 545
 546         FOR_EACH_SLOT(i) {
 547                 struct slot_info *s = &slot[i];
 548                 if (s->format != format)
 549                         continue;
 550                 if (!s->receiver_node)
 551                         continue;
 552                 if (s->receiver_node->task.error >= 0)
 553                         return 1;
 554                 ret = -1;
 555         }
 556         return ret;
 557 }
 558
 559 struct btr_node *audiod_get_btr_root(void)
 560 {
 561         int i, newest_slot = -1;
 562         struct timeval newest_rstime = {0, 0};
 563
 564         FOR_EACH_SLOT(i) {
 565                 struct slot_info *s = &slot[i];
 566                 struct timeval rstime;
 567                 if (!s->receiver_node)
 568                         continue;
 569                 if (s->receiver_node->task.error < 0)
 570                         continue;
 571                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 572                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 573                         continue;
 574                 newest_rstime = rstime;
 575                 newest_slot = i;
 576         }
 577         if (newest_slot == -1)
 578                 return NULL;
 579         return slot[newest_slot].receiver_node->btrn;
 580 }
 581
 582 /* returns slot num on success. */
 583 static int open_current_receiver(struct sched *s)
 584 {
 585         struct timeval diff;
 586         int ret, cafn = stat_task->current_audio_format_num;
 587
 588         if (cafn < 0 || !stat_task->ct)
 589                 return -1;
 590         /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
 591         if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
 592                 return -1;
 593         ret = receiver_running(cafn);
 594         if (ret > 0) /* already running and not eof */
 595                 return -1;
 596         if (ret < 0) { /* eof */
 597                 /*
 598                  * para_server uses a zero start time during the announcement
 599                  * period, i.e. before it sends the first chunk. Wait until
 600                  * this period begins to avoid restarting the receiver that
 601                  * belongs to the file just completed.
 602                  */
 603                 if (stat_task->server_stream_start.tv_sec != 0) {
 604                         sched_request_timeout_ms(100, s);
 605                         return -1;
 606                 }
 607         }
 608         if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
 609                 if (tv_diff(&s->timeout, &diff, NULL) > 0)
 610                         sched_request_timeout(&diff, s);
 611                 else
 612                         sched_min_delay(s);
 613                 return -1;
 614         }
 615         /* start a new receiver */
 616         return open_receiver(cafn);
 617 }
 618
 619 static unsigned compute_time_diff(const struct timeval *status_time)
 620 {
 621         struct timeval tmp, diff;
 622         static unsigned count;
 623         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 624         const struct timeval max_deviation = {0, 500 * 1000};
 625         const int time_smooth = 5;
 626
 627         if (!status_time)
 628                 return count;
 629         sign = tv_diff(status_time, now, &diff);
 630 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 631 //                      sign, sa_time_diff_sign);
 632         if (!count) {
 633                 sa_time_diff_sign = sign;
 634                 stat_task->sa_time_diff = diff;
 635                 count++;
 636                 goto out;
 637         }
 638         if (count > 5) {
 639                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 640                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 641                         PARA_WARNING_LOG("time diff jump: %lims\n",
 642                                 s * tv2ms(&tmp));
 643         }
 644         count++;
 645         sa_time_diff_sign = tv_convex_combination(
 646                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 647                 count > 10? sign : sign * time_smooth, &diff,
 648                 &tmp);
 649         stat_task->sa_time_diff = tmp;
 650         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 651                 sign > 0? "+" : "-",
 652                 tv2ms(&diff),
 653                 sa_time_diff_sign ? "+" : "-",
 654                 tv2ms(&stat_task->sa_time_diff)
 655         );
 656 out:
 657         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 658         return count;
 659 }
 660
 661 static int update_item(int itemnum, char *buf)
 662 {
 663         long unsigned sec, usec;
 664
 665         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 666                 return 1;
 667         free(stat_item_values[itemnum]);
 668         stat_item_values[itemnum] = para_strdup(buf);
 669         stat_client_write_item(itemnum);
 670         switch (itemnum) {
 671         case SI_STATUS_FLAGS:
 672                 stat_task->vss_status = 0;
 673                 if (strchr(buf, 'N'))
 674                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 675                 if (strchr(buf, 'P'))
 676                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 677                 break;
 678         case SI_OFFSET:
 679                 stat_task->offset_seconds = atoi(buf);
 680                 break;
 681         case SI_SECONDS_TOTAL:
 682                 stat_task->length_seconds = atoi(buf);
 683                 break;
 684         case SI_STREAM_START:
 685                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 686                         struct timeval a_start, delay;
 687                         delay.tv_sec = conf.stream_delay_arg / 1000;
 688                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 689                         stat_task->server_stream_start.tv_sec = sec;
 690                         stat_task->server_stream_start.tv_usec = usec;
 691                         if (compute_time_diff(NULL) > 2) {
 692                                 if (stat_task->sa_time_diff_sign < 0)
 693                                         tv_add(&stat_task->server_stream_start,
 694                                                 &stat_task->sa_time_diff, &a_start);
 695                                 else
 696                                         tv_diff(&stat_task->server_stream_start,
 697                                                 &stat_task->sa_time_diff, &a_start);
 698                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 699                         }
 700                 }
 701                 break;
 702         case SI_CURRENT_TIME:
 703                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 704                         struct timeval tv = {sec, usec};
 705                         compute_time_diff(&tv);
 706                 }
 707                 break;
 708         case SI_FORMAT:
 709                 stat_task->current_audio_format_num
 710                         = get_audio_format_num(buf);
 711         }
 712         return 1;
 713 }
 714
 715 static int parse_stream_command(const char *txt, char **cmd)
 716 {
 717         char *p = strchr(txt, ':');
 718         int i;
 719
 720         if (!p)
 721                 return -E_MISSING_COLON;
 722         p++;
 723         FOR_EACH_AUDIO_FORMAT(i) {
 724                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 725                         continue;
 726                 *cmd = p;
 727                 return i;
 728         }
 729         return -E_UNSUPPORTED_AUDIO_FORMAT;
 730 }
 731
 732 static int add_filter(int format, char *cmdline)
 733 {
 734         struct audio_format_info *a = &afi[format];
 735         int filter_num, nf = a->num_filters;
 736
 737         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 738         if (filter_num < 0)
 739                 return filter_num;
 740         a->filter_nums[nf] = filter_num;
 741         a->num_filters++;
 742         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 743                 filters[filter_num].name);
 744         return filter_num;
 745 }
 746
 747 static int parse_writer_args(void)
 748 {
 749         int i, ret, nw;
 750         char *cmd;
 751         struct audio_format_info *a;
 752
 753         nw = PARA_MAX(1U, conf.writer_given);
 754         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 755         FOR_EACH_AUDIO_FORMAT(i) {
 756                 a = &afi[i];
 757                 a->writer_conf = para_malloc(nw * sizeof(void *));
 758                 a->writer_nums = para_malloc(nw * sizeof(int));
 759                 a->num_writers = 0;
 760         }
 761         for (i = 0; i < conf.writer_given; i++) {
 762                 void *wconf;
 763                 int writer_num;
 764                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 765                 if (ret < 0)
 766                         goto out;
 767                 a = &afi[ret];
 768                 nw = a->num_writers;
 769                 wconf = check_writer_arg(cmd, &writer_num);
 770                 if (!wconf) {
 771                         ret = writer_num;
 772                         goto out;
 773                 }
 774                 a->writer_nums[nw] = writer_num;
 775                 a->writer_conf[nw] = wconf;
 776                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 777                         nw, writer_names[writer_num]);
 778                 a->num_writers++;
 779         }
 780         ret = 1;
 781 out:
 782         return ret;
 783 }
 784
 785 static int parse_receiver_args(void)
 786 {
 787         int i, ret, receiver_num;
 788         char *cmd = NULL;
 789         struct audio_format_info *a;
 790
 791         for (i = conf.receiver_given - 1; i >= 0; i--) {
 792                 char *arg = conf.receiver_arg[i];
 793                 char *recv_arg = strchr(arg, ':');
 794                 ret = -E_MISSING_COLON;
 795                 if (!recv_arg)
 796                         goto out;
 797                 *recv_arg = '\0';
 798                 recv_arg++;
 799                 ret = get_audio_format_num(arg);
 800                 if (ret < 0)
 801                         goto out;
 802                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 803                 if (!afi[ret].receiver_conf) {
 804                         ret = -E_RECV_SYNTAX;
 805                         goto out;
 806                 }
 807                 afi[ret].receiver = &receivers[receiver_num];
 808         }
 809         /* use the first available receiver with no arguments
 810          * for those audio formats for which no receiver
 811          * was specified
 812          */
 813         cmd = para_strdup(receivers[0].name);
 814         FOR_EACH_AUDIO_FORMAT(i) {
 815                 a = &afi[i];
 816                 if (a->receiver_conf)
 817                         continue;
 818                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 819                 if (!a->receiver_conf)
 820                         return -E_RECV_SYNTAX;
 821                 a->receiver = &receivers[receiver_num];
 822         }
 823         ret = 1;
 824 out:
 825         free(cmd);
 826         return ret;
 827 }
 828
 829 static int init_default_filters(void)
 830 {
 831         int i, ret = 1;
 832
 833         FOR_EACH_AUDIO_FORMAT(i) {
 834                 struct audio_format_info *a = &afi[i];
 835                 char *tmp;
 836                 int j;
 837
 838                 if (a->num_filters)
 839                         continue; /* no default -- nothing to to */
 840                 /* add "dec" to audio format name */
 841                 tmp = make_message("%sdec", audio_formats[i]);
 842                 for (j = 0; filters[j].name; j++)
 843                         if (!strcmp(tmp, filters[j].name))
 844                                 break;
 845                 free(tmp);
 846                 ret = -E_UNSUPPORTED_FILTER;
 847                 if (!filters[j].name)
 848                         goto out;
 849                 tmp = para_strdup(filters[j].name);
 850                 ret = add_filter(i, tmp);
 851                 free(tmp);
 852                 if (ret < 0)
 853                         goto out;
 854                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 855                         filters[j].name);
 856         }
 857 out:
 858         return ret;
 859 }
 860
 861 static int parse_filter_args(void)
 862 {
 863         int i, ret, nf;
 864
 865         nf = PARA_MAX(1U, conf.filter_given);
 866         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 867         FOR_EACH_AUDIO_FORMAT(i) {
 868                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 869                 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
 870         }
 871         if (!conf.no_default_filters_given)
 872                 return init_default_filters();
 873         for (i = 0; i < conf.filter_given; i++) {
 874                 char *arg = conf.filter_arg[i];
 875                 char *filter_name = strchr(arg, ':');
 876                 ret = -E_MISSING_COLON;
 877                 if (!filter_name)
 878                         goto out;
 879                 *filter_name = '\0';
 880                 filter_name++;
 881                 ret = get_audio_format_num(arg);
 882                 if (ret < 0)
 883                         goto out;
 884                 ret = add_filter(ret, filter_name);
 885                 if (ret < 0)
 886                         goto out;
 887         }
 888         ret = init_default_filters(); /* use default values for the rest */
 889 out:
 890         return ret;
 891 }
 892
 893 static int parse_stream_args(void)
 894 {
 895         int ret;
 896
 897         ret = parse_receiver_args();
 898         if (ret < 0)
 899                 return ret;
 900         ret = parse_filter_args();
 901         if (ret < 0)
 902                 return ret;
 903         ret = parse_writer_args();
 904         if (ret < 0)
 905                 return ret;
 906         return 1;
 907 }
 908
 909 /* does not unlink socket on errors */
 910 static int audiod_get_socket(void)
 911 {
 912         struct sockaddr_un unix_addr;
 913         int ret, fd;
 914
 915         if (conf.socket_given)
 916                 socket_name = para_strdup(conf.socket_arg);
 917         else {
 918                 char *hn = para_hostname();
 919                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 920                         hn);
 921                 free(hn);
 922         }
 923         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 924         if (conf.force_given)
 925                 unlink(socket_name);
 926         ret = create_local_socket(socket_name, &unix_addr,
 927                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 928         if (ret < 0)
 929                 goto err;
 930         fd = ret;
 931         if (listen(fd , 5) < 0) {
 932                 ret = -ERRNO_TO_PARA_ERROR(errno);
 933                 goto err;
 934         }
 935         ret = mark_fd_nonblocking(fd);
 936         if (ret < 0)
 937                 goto err;
 938         return fd;
 939 err:
 940         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 941         exit(EXIT_FAILURE);
 942 }
 943
 944 static void signal_pre_select(struct sched *s, struct task *t)
 945 {
 946         struct signal_task *st = container_of(t, struct signal_task, task);
 947         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 948 }
 949
 950 static void signal_post_select(struct sched *s, struct task *t)
 951 {
 952         struct signal_task *st = container_of(t, struct signal_task, task);
 953
 954         if (!FD_ISSET(st->fd, &s->rfds))
 955                 return;
 956
 957         st->signum = para_next_signal();
 958         switch (st->signum) {
 959         case SIGINT:
 960         case SIGTERM:
 961         case SIGHUP:
 962                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 963                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 964         }
 965 }
 966
 967 static void signal_setup_default(struct signal_task *st)
 968 {
 969         st->task.pre_select = signal_pre_select;
 970         st->task.post_select = signal_post_select;
 971         sprintf(st->task.status, "signal task");
 972 }
 973
 974 static void command_pre_select(struct sched *s, struct task *t)
 975 {
 976         struct command_task *ct = container_of(t, struct command_task, task);
 977         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 978 }
 979
 980 static void command_post_select(struct sched *s, struct task *t)
 981 {
 982         int ret;
 983         struct command_task *ct = container_of(t, struct command_task, task);
 984         static struct timeval last_status_dump;
 985         struct timeval tmp, delay = {0, 500 * 1000};
 986
 987         tv_add(&last_status_dump, &delay, &tmp);
 988         if (tv_diff(&tmp, now, NULL) < 0) {
 989                 audiod_status_dump();
 990                 last_status_dump = *now;
 991         }
 992
 993         if (!FD_ISSET(ct->fd, &s->rfds))
 994                 return;
 995         ret = handle_connect(ct->fd);
 996         if (ret < 0)
 997                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 998 }
 999
1000 static void init_command_task(struct command_task *ct)
1001 {
1002         ct->task.pre_select = command_pre_select;
1003         ct->task.post_select = command_post_select;
1004         ct->task.error = 0;
1005         ct->fd = audiod_get_socket(); /* doesn't return on errors */
1006         sprintf(ct->task.status, "command task");
1007 }
1008
1009 static void close_stat_pipe(void)
1010 {
1011         if (!stat_task->ct)
1012                 return;
1013         client_close(stat_task->ct);
1014         stat_task->ct = NULL;
1015         clear_and_dump_items();
1016         stat_task->length_seconds = 0;
1017         stat_task->offset_seconds = 0;
1018         stat_task->vss_status = 0;
1019         stat_task->current_audio_format_num = -1;
1020         audiod_status_dump();
1021 }
1022
1023 /**
1024  * close the connection to para_server and exit
1025  *
1026  * \param status the exit status which is passed to exit(3)
1027  * \param msg the log message
1028  *
1029  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1030  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1031  * EXIT_FAILURE.
1032  *
1033  * \sa exit(3)
1034  */
1035 void __noreturn clean_exit(int status, const char *msg)
1036 {
1037         PARA_EMERG_LOG("%s\n", msg);
1038         if (socket_name)
1039                 unlink(socket_name);
1040         close_stat_pipe();
1041         exit(status);
1042 }
1043
1044 /* avoid busy loop if server is down */
1045 static void set_stat_task_restart_barrier(unsigned seconds)
1046 {
1047         struct timeval delay = {seconds, 0};
1048         tv_add(now, &delay, &stat_task->restart_barrier);
1049 }
1050
1051 static bool try_to_close_slot(int slot_num)
1052 {
1053         struct slot_info *s = &slot[slot_num];
1054         struct audio_format_info *a = afi + s->format;
1055         int i;
1056
1057         if (s->format < 0)
1058                 return false;
1059         if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1060                 return false;
1061         for (i = 0; i < a->num_filters; i++)
1062                 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1063                         return false;
1064         if (a->num_writers > 0) {
1065                 for (i = 0; i < a->num_writers; i++)
1066                         if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1067                                 return false;
1068         } else {
1069                 if (s->wns && s->wns[0].task.error != -E_TASK_UNREGISTERED)
1070                         return false;
1071         }
1072         PARA_INFO_LOG("closing slot %d\n", slot_num);
1073         close_writers(s);
1074         close_filters(s);
1075         close_receiver(slot_num);
1076         clear_slot(slot_num);
1077         return true;
1078 }
1079
1080 /*
1081  * Check if any receivers/filters/writers need to be started and do so if
1082  * necessary.
1083  */
1084 static void start_stop_decoders(struct sched *s)
1085 {
1086         int i, ret;
1087         struct slot_info *sl;
1088         struct audio_format_info *a;
1089
1090         FOR_EACH_SLOT(i)
1091                 if (try_to_close_slot(i))
1092                         sched_min_delay(s);
1093 //      if (audiod_status != AUDIOD_ON ||
1094 //                      !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1095 //              return kill_all_decoders(-E_NOT_PLAYING);
1096         ret = open_current_receiver(s);
1097         if (ret < 0)
1098                 return;
1099         sl = slot + ret;
1100         a = afi + sl->format;
1101         if (a->num_filters)
1102                 open_filters(sl);
1103         open_writers(sl);
1104         activate_grab_clients();
1105         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1106         sched_min_delay(s);
1107 }
1108
1109 /* restart the client task if necessary */
1110 static void status_pre_select(struct sched *s, struct task *t)
1111 {
1112         struct status_task *st = container_of(t, struct status_task, task);
1113
1114         if (audiod_status == AUDIOD_OFF) {
1115                 if (!st->ct)
1116                         goto out;
1117                 if (st->ct->task.error >= 0) {
1118                         st->ct->task.error = -E_AUDIOD_OFF;
1119                         goto out;
1120                 }
1121                 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1122                         goto out;
1123                 close_stat_pipe();
1124                 st->clock_diff_count = conf.clock_diff_count_arg;
1125                 goto out;
1126         }
1127         if (st->ct) {
1128                 int ret;
1129                 if (st->ct->task.error < 0) {
1130                         if (st->ct->task.error != -E_TASK_UNREGISTERED)
1131                                 goto out;
1132                         close_stat_pipe();
1133                         goto out;
1134                 }
1135                 if (st->ct->status != CL_RECEIVING)
1136                         goto out;
1137                 ret = for_each_stat_item(st->ct->buf, st->ct->loaded,
1138                         update_item);
1139                 if (ret < 0) {
1140                         st->ct->task.error = ret;
1141                         goto out;
1142                 }
1143                 if (st->ct->loaded != ret) {
1144                         st->last_status_read = *now;
1145                         st->ct->loaded = ret;
1146                 } else {
1147                         struct timeval diff;
1148                         tv_diff(now, &st->last_status_read, &diff);
1149                         if (diff.tv_sec > 61)
1150                                 st->ct->task.error = -E_STATUS_TIMEOUT;
1151                 }
1152                 goto out;
1153         }
1154         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1155                 goto out;
1156         if (st->clock_diff_count) { /* get status only one time */
1157                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1158                 int argc = 5;
1159                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1160                 st->clock_diff_count--;
1161                 client_open(argc, argv, &st->ct, NULL);
1162                 set_stat_task_restart_barrier(2);
1163                 sched_min_delay(s);
1164
1165         } else {
1166                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1167                 int argc = 4;
1168                 client_open(argc, argv, &st->ct, NULL);
1169                 set_stat_task_restart_barrier(5);
1170                 sched_min_delay(s);
1171         }
1172         free(stat_item_values[SI_BASENAME]);
1173         stat_item_values[SI_BASENAME] = para_strdup(
1174                 "no connection to para_server");
1175         stat_client_write_item(SI_BASENAME);
1176         st->last_status_read = *now;
1177 out:
1178         start_stop_decoders(s);
1179 }
1180
1181 static void init_status_task(struct status_task *st)
1182 {
1183         memset(st, 0, sizeof(struct status_task));
1184         st->task.pre_select = status_pre_select;
1185         st->sa_time_diff_sign = 1;
1186         st->clock_diff_count = conf.clock_diff_count_arg;
1187         st->current_audio_format_num = -1;
1188         sprintf(st->task.status, "status task");
1189 }
1190
1191 static void set_initial_status(void)
1192 {
1193         audiod_status = AUDIOD_ON;
1194         if (!conf.mode_given)
1195                 return;
1196         if (!strcmp(conf.mode_arg, "sb")) {
1197                 audiod_status = AUDIOD_STANDBY;
1198                 return;
1199         }
1200         if (!strcmp(conf.mode_arg, "off")) {
1201                 audiod_status = AUDIOD_OFF;
1202                 return;
1203         }
1204         if (strcmp(conf.mode_arg, "on"))
1205                 PARA_WARNING_LOG("invalid mode\n");
1206 }
1207
1208 __noreturn static void print_help_and_die(void)
1209 {
1210         int d = conf.detailed_help_given;
1211         const char **p = d? audiod_args_info_detailed_help
1212                 : audiod_args_info_help;
1213
1214         printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1215                 AUDIOD_CMDLINE_PARSER_VERSION);
1216         printf_or_die("%s\n\n", audiod_args_info_usage);
1217         for (; *p; p++)
1218                 printf_or_die("%s\n", *p);
1219         print_receiver_helps(d);
1220         print_filter_helps(d);
1221         print_writer_helps(d);
1222         exit(0);
1223 }
1224
1225 static void init_colors_or_die(void)
1226 {
1227         int ret, i;
1228
1229         if (!want_colors())
1230                 return;
1231         daemon_set_default_log_colors();
1232         daemon_set_flag(DF_COLOR_LOG);
1233         for (i = 0; i < conf.log_color_given; i++) {
1234                 ret = daemon_set_log_color(conf.log_color_arg[i]);
1235                 if (ret < 0)
1236                         exit(EXIT_FAILURE);
1237         }
1238 }
1239
1240 /**
1241  * the main function of para_audiod
1242  *
1243  * \param argc usual argument count
1244  * \param argv usual argument vector
1245  *
1246  * \return EXIT_SUCCESS or EXIT_FAILURE
1247  *
1248  * \sa para_audiod(1)
1249  * */
1250 int main(int argc, char *argv[])
1251 {
1252         int ret, i;
1253         static struct sched s;
1254         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1255         struct audiod_cmdline_parser_params params = {
1256                 .override = 0,
1257                 .initialize = 1,
1258                 .check_required = 0,
1259                 .check_ambiguity = 0,
1260                 .print_errors = 1
1261         };
1262
1263         valid_fd_012();
1264         if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1265                 exit(EXIT_FAILURE);
1266         HANDLE_VERSION_FLAG("audiod", conf);
1267         /* init receivers/filters/writers early to make help work */
1268         recv_init();
1269         filter_init();
1270         writer_init();
1271         if (conf.help_given || conf.detailed_help_given)
1272                 print_help_and_die();
1273         drop_privileges_or_die(conf.user_arg, conf.group_arg);
1274         parse_config_or_die();
1275         init_colors_or_die();
1276         init_random_seed_or_die();
1277         daemon_set_flag(DF_LOG_TIME);
1278         daemon_set_flag(DF_LOG_HOSTNAME);
1279         daemon_set_flag(DF_LOG_LL);
1280         if (conf.log_timing_given)
1281                 daemon_set_flag(DF_LOG_TIMING);
1282         if (conf.logfile_given) {
1283                 daemon_set_logfile(conf.logfile_arg);
1284                 daemon_open_log_or_die();
1285         }
1286         ret = parse_stream_args();
1287         if (ret < 0) {
1288                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1289                 exit(EXIT_FAILURE);
1290         }
1291         log_welcome("para_audiod");
1292         server_uptime(UPTIME_SET);
1293         set_initial_status();
1294         FOR_EACH_SLOT(i)
1295                 clear_slot(i);
1296         setup_signal_handling();
1297         signal_setup_default(sig_task);
1298
1299         init_status_task(stat_task);
1300         init_command_task(cmd_task);
1301
1302         if (conf.daemon_given)
1303                 daemonize();
1304
1305         register_task(&sig_task->task);
1306         register_task(&cmd_task->task);
1307         register_task(&stat_task->task);
1308         s.default_timeout.tv_sec = 2;
1309         s.default_timeout.tv_usec = 999 * 1000;
1310         ret = schedule(&s);
1311
1312         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1313         return EXIT_FAILURE;
1314 }