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 <sys/types.h>
   9 #include <dirent.h>
  10 #include <signal.h>
  11
  12 #include "para.h"
  13 #include "error.h"
  14 #include "audiod.cmdline.h"
  15 #include "list.h"
  16 #include "sched.h"
  17 #include "ggo.h"
  18 #include "recv.h"
  19 #include "filter.h"
  20 #include "grab_client.cmdline.h"
  21 #include "grab_client.h"
  22 #include "client.cmdline.h"
  23 #include "client.h"
  24 #include "audiod.h"
  25 #include "net.h"
  26 #include "daemon.h"
  27 #include "string.h"
  28 #include "fd.h"
  29 #include "write.h"
  30 #include "write_common.h"
  31 #include "signal.h"
  32
  33 /** define the array of error lists needed by para_audiod */
  34 INIT_AUDIOD_ERRLISTS;
  35 /** define the array containing all supported audio formats */
  36 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
  37
  38 /** Defines how audiod handles one supported audio format. */
  39 struct audio_format_info {
  40         /** pointer to the receiver for this audio format */
  41         struct receiver *receiver;
  42         /** the receiver configuration */
  43         void *receiver_conf;
  44         /** the number of filters that should be activated for this audio format */
  45         unsigned int num_filters;
  46         /** Array of filter numbers to be activated. */
  47         unsigned *filter_nums;
  48         /** Pointer to the array of filter configurations. */
  49         void **filter_conf;
  50         /** the number of filters that should be activated for this audio format */
  51         unsigned int num_writers;
  52         /** pointer to the array of writers to be activated */
  53         struct writer **writers;
  54         /** pointer to the array of writer configurations */
  55         void **writer_conf;
  56         /** do not start receiver/filters/writer before this time */
  57         struct timeval restart_barrier;
  58 };
  59
  60 /**
  61  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  62  * be associated with a receiver/filter/writer triple. This array holds all
  63  * information on the status of these slots.
  64  *
  65  * \sa struct slot_info
  66  * */
  67 struct slot_info slot[MAX_STREAM_SLOTS];
  68
  69 /** The vss status flags audiod is interested in. */
  70 enum vss_status_flags {
  71         /** Whether the 'N' flag is set. */
  72         VSS_STATUS_FLAG_NEXT = 1,
  73         /** The 'P' flag is set. */
  74         VSS_STATUS_FLAG_PLAYING = 2,
  75 };
  76
  77 /**
  78  * The task for obtaining para_server's status (para_client stat).
  79  *
  80  * \sa struct task, struct sched.
  81  */
  82 struct status_task {
  83         /** The associated task structure of audiod. */
  84         struct task task;
  85         /** Client data associated with the stat task. */
  86         struct client_task *ct;
  87         /** Do not restart client command until this time. */
  88         struct timeval restart_barrier;
  89         /** Last time we received status data from para_server. */
  90         struct timeval last_status_read;
  91         /** The offset value announced by para_server. */
  92         int offset_seconds;
  93         /** The length of the current audio file as announced by para_server. */
  94         int length_seconds;
  95         /** The start of the current stream from the view of para_server. */
  96         struct timeval server_stream_start;
  97         /** The average time deviation between para_server and para_audiod. */
  98         struct timeval sa_time_diff;
  99         /** Whether client time is ahead of server time. */
 100         int sa_time_diff_sign;
 101         /** The 'P' and the 'N' flags as announced by para_server. */
 102         enum vss_status_flags vss_status;
 103         /** Number of times the clock difference is to be checked. */
 104         unsigned clock_diff_count;
 105         /** When to start the next check for clock difference. */
 106         struct timeval clock_diff_barrier;
 107         /** Number of the audio format as announced by para_server. */
 108         int current_audio_format_num;
 109 };
 110
 111 /** The array of status items sent by para_server. */
 112 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
 113
 114 /**
 115  * the current mode of operation of which can be changed by the on/off/cycle
 116  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
 117  */
 118 int audiod_status = AUDIOD_ON;
 119
 120 /**
 121  * the gengetopt args_info struct that holds information on all command line
 122  * arguments
 123  */
 124 struct audiod_args_info conf;
 125
 126 static char *socket_name;
 127 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 128
 129 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
 130
 131 static struct status_task status_task_struct;
 132
 133 /**
 134  * the task that calls the status command of para_server
 135  *
 136  * \sa struct status_task
 137  */
 138 static struct status_task *stat_task = &status_task_struct;
 139 static struct timeval initial_delay_barrier;
 140
 141 /**
 142  * the task for handling audiod commands
 143  *
 144  * \sa struct task, struct sched
 145  */
 146 struct command_task {
 147         /** the local listening socket */
 148         int fd;
 149         /** the associated task structure */
 150         struct task task;
 151 };
 152
 153 /** iterate over all supported audio formats */
 154 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 155
 156 /**
 157  * get the audio format number
 158  * \param name the name of the audio format
 159  *
 160  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 161  * \a name is not a supported audio format.
 162  */
 163 int get_audio_format_num(char *name)
 164 {
 165         int i;
 166
 167         while (para_isspace(*name))
 168                 name++;
 169         FOR_EACH_AUDIO_FORMAT(i)
 170                 if (!strcmp(name, audio_formats[i]))
 171                         return i;
 172         return -E_UNSUPPORTED_AUDIO_FORMAT;
 173 }
 174
 175 char *get_time_string(struct timeval *newest_stime)
 176 {
 177         struct timeval diff, adj_stream_start, tmp;
 178         int total = 0, use_server_time = 1,
 179                 length_seconds = stat_task->length_seconds;
 180
 181         if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
 182                 if (length_seconds)
 183                         return NULL;
 184                 return make_message("%s:\n", status_item_list[SI_PLAY_TIME]);
 185         }
 186         if (audiod_status == AUDIOD_OFF)
 187                 goto out;
 188         if (stat_task->sa_time_diff_sign > 0)
 189                 tv_diff(&stat_task->server_stream_start, &stat_task->sa_time_diff,
 190                         &adj_stream_start);
 191         else
 192                 tv_add(&stat_task->server_stream_start, &stat_task->sa_time_diff,
 193                         &adj_stream_start);
 194         tmp = adj_stream_start;
 195         if (newest_stime && audiod_status == AUDIOD_ON) {
 196                 tv_diff(newest_stime, &adj_stream_start, &diff);
 197                 if (tv2ms(&diff) < 5000) {
 198                         tmp = *newest_stime;
 199                         use_server_time = 0;
 200                 }
 201         }
 202         tv_diff(now, &tmp, &diff);
 203         total = diff.tv_sec + stat_task->offset_seconds;
 204         if (total > length_seconds)
 205                 total = length_seconds;
 206         if (total < 0)
 207                 total = 0;
 208 out:
 209         return make_message(
 210                 "%s: %s%d:%02d [%d:%02d] (%d%%/%d:%02d)\n",
 211                 status_item_list[SI_PLAY_TIME],
 212                 use_server_time? "~" : "",
 213                 total / 60,
 214                 total % 60,
 215                 (length_seconds - total) / 60,
 216                 (length_seconds - total) % 60,
 217                 length_seconds? (total * 100 + length_seconds / 2) /
 218                         length_seconds : 0,
 219                 length_seconds / 60,
 220                 length_seconds % 60
 221         );
 222 }
 223
 224 static int want_colors(void)
 225 {
 226         if (conf.color_arg == color_arg_no)
 227                 return 0;
 228         if (conf.color_arg == color_arg_yes)
 229                 return 1;
 230         if (conf.logfile_given)
 231                 return 0;
 232         return isatty(STDERR_FILENO);
 233 }
 234
 235 static void parse_config_or_die(void)
 236 {
 237         int ret;
 238         char *config_file;
 239         struct audiod_cmdline_parser_params params = {
 240                 .override = 0,
 241                 .initialize = 0,
 242                 .check_required = 1,
 243                 .check_ambiguity = 0,
 244                 .print_errors = 1
 245         };
 246
 247         if (conf.config_file_given)
 248                 config_file = para_strdup(conf.config_file_arg);
 249         else {
 250                 char *home = para_homedir();
 251                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 252                 free(home);
 253         }
 254         ret = file_exists(config_file);
 255         if (conf.config_file_given && !ret) {
 256                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 257                 goto err;
 258         }
 259         if (ret)
 260                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 261         free(config_file);
 262         daemon_set_loglevel(conf.loglevel_arg);
 263         return;
 264 err:
 265         free(config_file);
 266         exit(EXIT_FAILURE);
 267 }
 268
 269 static void setup_signal_handling(void)
 270 {
 271         sig_task->fd = para_signal_init();
 272         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 273         para_install_sighandler(SIGINT);
 274         para_install_sighandler(SIGTERM);
 275         para_install_sighandler(SIGHUP);
 276         signal(SIGPIPE, SIG_IGN);
 277 }
 278
 279 static void clear_slot(int slot_num)
 280 {
 281         struct slot_info *s = &slot[slot_num];
 282
 283         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 284         memset(s, 0, sizeof(struct slot_info));
 285         s->format = -1;
 286 }
 287
 288 static void close_receiver(int slot_num)
 289 {
 290         struct slot_info *s = &slot[slot_num];
 291         struct audio_format_info *a;
 292
 293         if (s->format < 0 || !s->receiver_node)
 294                 return;
 295         a = &afi[s->format];
 296         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 297                 audio_formats[s->format], slot_num);
 298         a->receiver->close(s->receiver_node);
 299         free(s->receiver_node);
 300         s->receiver_node = NULL;
 301 }
 302
 303 static void kill_all_decoders(int error)
 304 {
 305         int i;
 306
 307         FOR_EACH_SLOT(i) {
 308                 struct slot_info *s = &slot[i];
 309                 if (s->wng && s->wng->task.error >= 0) {
 310                         PARA_INFO_LOG("deactivating wng in slot %d\n",
 311                                 i);
 312                         s->wng->task.error = error;
 313                 }
 314                 if (s->fc && s->fc->task.error >= 0) {
 315                         PARA_INFO_LOG("deactivatimg filter chain in slot %d\n", i);
 316                         s->fc->task.error = error;
 317                 }
 318                 if (s->receiver_node && s->receiver_node->task.error >= 0) {
 319                         PARA_INFO_LOG("deactivating receiver_node in slot %d\n", i);
 320                         s->receiver_node->task.error = error;
 321                 }
 322         }
 323 }
 324
 325 static int get_empty_slot(void)
 326 {
 327         int i;
 328         struct slot_info *s;
 329
 330         FOR_EACH_SLOT(i) {
 331                 s = &slot[i];
 332                 if (s->format < 0) {
 333                         clear_slot(i);
 334                         return i;
 335                 }
 336                 if (s->wng || s->receiver_node || s->fc)
 337                         continue;
 338                 clear_slot(i);
 339                 return i;
 340         }
 341         return -E_NO_MORE_SLOTS;
 342 }
 343
 344 /**
 345  * get the number of filters
 346  *
 347  * \param audio_format_num the number identifying the audio format
 348  *
 349  * \return the number of filters for the given audio format
 350  *
 351  * \sa struct filter;
 352  */
 353 int num_filters(int audio_format_num)
 354 {
 355         return afi[audio_format_num].num_filters;
 356 }
 357
 358 static void open_filters(int slot_num)
 359 {
 360         struct slot_info *s = &slot[slot_num];
 361         struct audio_format_info *a = &afi[s->format];
 362         struct filter_node *fn;
 363         int nf = a->num_filters;
 364         int i;
 365
 366         s->fc = NULL;
 367         if (!nf)
 368                 return;
 369         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 370         s->fc = para_calloc(sizeof(struct filter_chain));
 371         s->fc->filter_nodes = para_malloc(nf * sizeof(struct filter_node));
 372         s->fc->inbuf = s->receiver_node->buf;
 373         s->fc->in_loaded = &s->receiver_node->loaded;
 374         s->fc->input_error = &s->receiver_node->task.error;
 375         s->fc->task.pre_select = filter_pre_select;
 376         s->fc->task.post_select = NULL;
 377         s->fc->task.error = 0;
 378         s->fc->num_filters = nf;
 379
 380         s->receiver_node->output_error = &s->fc->task.error;
 381         sprintf(s->fc->task.status, "filter chain");
 382         FOR_EACH_FILTER_NODE(fn, s->fc, i) {
 383                 struct filter *f = filters + a->filter_nums[i];
 384                 fn->filter_num = a->filter_nums[i];
 385                 fn->conf = a->filter_conf[i];
 386                 fn->fc = s->fc;
 387                 fn->loaded = 0;
 388                 INIT_LIST_HEAD(&fn->callbacks);
 389                 f->open(fn);
 390                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 391                         audio_formats[s->format], i,  nf, f->name, slot_num);
 392                 s->fc->outbuf = fn->buf;
 393                 s->fc->out_loaded = &fn->loaded;
 394         }
 395         register_task(&s->fc->task);
 396 }
 397
 398 static void open_writers(int slot_num)
 399 {
 400         int ret, i;
 401         struct slot_info *s = &slot[slot_num];
 402         struct audio_format_info *a = &afi[s->format];
 403
 404         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 405         if (!a->num_writers)
 406                 s->wng = setup_default_wng();
 407         else
 408                 s->wng = wng_new(a->num_writers);
 409         if (s->fc) {
 410                 s->wng->buf = s->fc->outbuf;
 411                 s->wng->loaded = s->fc->out_loaded;
 412                 s->wng->input_error = &s->fc->task.error;
 413                 s->wng->channels = &s->fc->channels;
 414                 s->wng->samplerate = &s->fc->samplerate;
 415                 s->fc->output_error = &s->wng->task.error;
 416                 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
 417         } else {
 418                 s->wng->buf = s->receiver_node->buf;
 419                 s->wng->loaded = &s->receiver_node->loaded;
 420                 s->wng->input_error = &s->receiver_node->task.error;
 421         }
 422         for (i = 0; i < a->num_writers; i++) {
 423                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 424                 s->wng->writer_nodes[i].writer = a->writers[i];
 425         }
 426         ret = wng_open(s->wng);
 427         if (ret < 0) {
 428                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 429                 return;
 430         }
 431         s->wstime = *now;
 432         activate_inactive_grab_clients(slot_num, s->format, s->fc);
 433 }
 434
 435 static int open_receiver(int format)
 436 {
 437         struct audio_format_info *a = &afi[format];
 438         struct slot_info *s;
 439         int ret, slot_num;
 440         struct receiver_node *rn;
 441         const struct timeval restart_delay = {2, 0};
 442
 443         ret = get_empty_slot();
 444         if (ret < 0)
 445                 goto err;
 446         slot_num = ret;
 447         s = &slot[slot_num];
 448         s->format = format;
 449         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 450         rn = s->receiver_node;
 451         rn->receiver = a->receiver;
 452         rn->conf = a->receiver_conf;
 453         ret = a->receiver->open(s->receiver_node);
 454         if (ret < 0) {
 455                 free(s->receiver_node);
 456                 s->receiver_node = NULL;
 457                 goto err;
 458         }
 459         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 460                 audio_formats[s->format], a->receiver->name, slot_num);
 461         rn->task.pre_select = a->receiver->pre_select;
 462         rn->task.post_select = a->receiver->post_select;
 463         sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
 464         register_task(&rn->task);
 465         ret = 1;
 466 err:
 467         if (ret < 0)
 468                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 469         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 470         return ret;
 471 }
 472
 473 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
 474 static int receiver_running(int format)
 475 {
 476         int i, ret = 0;
 477
 478         FOR_EACH_SLOT(i) {
 479                 struct slot_info *s = &slot[i];
 480                 if (s->format != format)
 481                         continue;
 482                 if (!s->receiver_node)
 483                         continue;
 484                 if (s->receiver_node->task.error >= 0)
 485                         return 1;
 486                 ret = -1;
 487         }
 488         return ret;
 489 }
 490
 491 static void open_current_receiver(struct sched *s)
 492 {
 493         struct timeval diff;
 494         int ret, cafn = stat_task->current_audio_format_num;
 495
 496         if (cafn < 0 || !stat_task->ct)
 497                 return;
 498         /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
 499         if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
 500                 return;
 501         ret = receiver_running(cafn);
 502         if (ret > 0) /* already running and not eof */
 503                 return;
 504         if (ret < 0) { /* eof */
 505                 /*
 506                  * para_server uses a zero start time during the announcement
 507                  * period, i.e. before it sends the first chunk. Wait until
 508                  * this period begins to avoid restarting the receiver that
 509                  * belongs to the file just completed.
 510                  */
 511                 if (stat_task->server_stream_start.tv_sec)
 512                         return;
 513         }
 514         if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
 515                 /* avoid busy loop */
 516                 s->timeout = diff;
 517                 return;
 518         }
 519         /* start a new receiver */
 520         open_receiver(cafn);
 521 }
 522
 523 static unsigned compute_time_diff(const struct timeval *status_time)
 524 {
 525         struct timeval tmp, diff;
 526         static unsigned count;
 527         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 528         const struct timeval max_deviation = {0, 500 * 1000};
 529         const int time_smooth = 5;
 530
 531         if (!status_time)
 532                 return count;
 533         sign = tv_diff(status_time, now, &diff);
 534 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 535 //                      sign, sa_time_diff_sign);
 536         if (!count) {
 537                 sa_time_diff_sign = sign;
 538                 stat_task->sa_time_diff = diff;
 539                 count++;
 540                 goto out;
 541         }
 542         if (count > 5) {
 543                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 544                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 545                         PARA_WARNING_LOG("time diff jump: %lims\n",
 546                                 s * tv2ms(&tmp));
 547         }
 548         count++;
 549         sa_time_diff_sign = tv_convex_combination(
 550                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 551                 count > 10? sign : sign * time_smooth, &diff,
 552                 &tmp);
 553         stat_task->sa_time_diff = tmp;
 554         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 555                 sign > 0? "+" : "-",
 556                 tv2ms(&diff),
 557                 sa_time_diff_sign ? "+" : "-",
 558                 tv2ms(&stat_task->sa_time_diff)
 559         );
 560 out:
 561         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 562         return count;
 563 }
 564
 565 static int check_stat_line(char *line, __a_unused void *data)
 566 {
 567         int itemnum;
 568         size_t ilen = 0;
 569         long unsigned sec, usec;
 570         char *tmp;
 571
 572         //PARA_INFO_LOG("line: %s\n", line);
 573         if (!line)
 574                 return 1;
 575         itemnum = stat_line_valid(line);
 576         if (itemnum < 0) {
 577                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 578                 return 1;
 579         }
 580         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 581                 return 1;
 582         tmp = make_message("%s\n", line);
 583         stat_client_write(tmp, itemnum);
 584         free(tmp);
 585         free(stat_item_values[itemnum]);
 586         stat_item_values[itemnum] = para_strdup(line);
 587         ilen = strlen(status_item_list[itemnum]);
 588         switch (itemnum) {
 589         case SI_STATUS_FLAGS:
 590                 stat_task->vss_status = 0;
 591                 if (strchr(line, 'N'))
 592                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 593                 if (strchr(line, 'P'))
 594                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 595                 break;
 596         case SI_OFFSET:
 597                 stat_task->offset_seconds = atoi(line + ilen + 1);
 598                 break;
 599         case SI_SECONDS_TOTAL:
 600                 stat_task->length_seconds = atoi(line + ilen + 1);
 601                 break;
 602         case SI_STREAM_START:
 603                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 604                         struct timeval a_start, delay;
 605                         delay.tv_sec = conf.stream_delay_arg / 1000;
 606                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 607                         stat_task->server_stream_start.tv_sec = sec;
 608                         stat_task->server_stream_start.tv_usec = usec;
 609                         if (compute_time_diff(NULL) > 2) {
 610                                 if (stat_task->sa_time_diff_sign < 0)
 611                                         tv_add(&stat_task->server_stream_start,
 612                                                 &stat_task->sa_time_diff, &a_start);
 613                                 else
 614                                         tv_diff(&stat_task->server_stream_start,
 615                                                 &stat_task->sa_time_diff, &a_start);
 616                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 617                         }
 618                 }
 619                 break;
 620         case SI_CURRENT_TIME:
 621                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 622                         struct timeval tv = {sec, usec};
 623                         compute_time_diff(&tv);
 624                 }
 625                 break;
 626         case SI_FORMAT:
 627                 stat_task->current_audio_format_num = get_audio_format_num(
 628                         line + ilen + 1);
 629         }
 630         return 1;
 631 }
 632
 633 static int parse_stream_command(const char *txt, char **cmd)
 634 {
 635         char *p = strchr(txt, ':');
 636         int i;
 637
 638         if (!p)
 639                 return -E_MISSING_COLON;
 640         p++;
 641         FOR_EACH_AUDIO_FORMAT(i) {
 642                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 643                         continue;
 644                 *cmd = p;
 645                 return i;
 646         }
 647         return -E_UNSUPPORTED_AUDIO_FORMAT;
 648 }
 649
 650 static int add_filter(int format, char *cmdline)
 651 {
 652         struct audio_format_info *a = &afi[format];
 653         int filter_num, nf = a->num_filters;
 654
 655         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 656         if (filter_num < 0)
 657                 return filter_num;
 658         a->filter_nums[nf] = filter_num;
 659         a->num_filters++;
 660         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 661                 filters[filter_num].name);
 662         return filter_num;
 663 }
 664
 665 static int parse_writer_args(void)
 666 {
 667         int i, ret, nw;
 668         char *cmd;
 669         struct audio_format_info *a;
 670
 671         nw = PARA_MAX(1U, conf.writer_given);
 672         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 673         FOR_EACH_AUDIO_FORMAT(i) {
 674                 a = &afi[i];
 675                 a->writer_conf = para_malloc(nw * sizeof(void *));
 676                 a->writers = para_malloc(nw * sizeof(struct writer *));
 677                 a->num_writers = 0;
 678         }
 679         for (i = 0; i < conf.writer_given; i++) {
 680                 void *wconf;
 681                 int writer_num;
 682                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 683                 if (ret < 0)
 684                         goto out;
 685                 a = &afi[ret];
 686                 nw = a->num_writers;
 687                 wconf = check_writer_arg(cmd, &writer_num);
 688                 if (!wconf) {
 689                         ret = writer_num;
 690                         goto out;
 691                 }
 692                 a->writers[nw] = &writers[writer_num];
 693                 a->writer_conf[nw] = wconf;
 694                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 695                         nw, writer_names[writer_num]);
 696                 a->num_writers++;
 697         }
 698         ret = 1;
 699 out:
 700         return ret;
 701 }
 702
 703 static int parse_receiver_args(void)
 704 {
 705         int i, ret, receiver_num;
 706         char *cmd = NULL;
 707         struct audio_format_info *a;
 708
 709         for (i = conf.receiver_given - 1; i >= 0; i--) {
 710                 char *arg = conf.receiver_arg[i];
 711                 char *recv_arg = strchr(arg, ':');
 712                 ret = -E_MISSING_COLON;
 713                 if (!recv_arg)
 714                         goto out;
 715                 *recv_arg = '\0';
 716                 recv_arg++;
 717                 ret = get_audio_format_num(arg);
 718                 if (ret < 0)
 719                         goto out;
 720                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 721                 if (!afi[ret].receiver_conf) {
 722                         ret = -E_RECV_SYNTAX;
 723                         goto out;
 724                 }
 725                 afi[ret].receiver = &receivers[receiver_num];
 726         }
 727         /* use the first available receiver with no arguments
 728          * for those audio formats for which no receiver
 729          * was specified
 730          */
 731         cmd = para_strdup(receivers[0].name);
 732         FOR_EACH_AUDIO_FORMAT(i) {
 733                 a = &afi[i];
 734                 if (a->receiver_conf)
 735                         continue;
 736                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 737                 if (!a->receiver_conf)
 738                         return -E_RECV_SYNTAX;
 739                 a->receiver = &receivers[receiver_num];
 740         }
 741         ret = 1;
 742 out:
 743         free(cmd);
 744         return ret;
 745 }
 746
 747 static int init_default_filters(void)
 748 {
 749         int i, ret = 1;
 750
 751         FOR_EACH_AUDIO_FORMAT(i) {
 752                 struct audio_format_info *a = &afi[i];
 753                 char *tmp;
 754                 int j;
 755
 756                 if (a->num_filters)
 757                         continue; /* no default -- nothing to to */
 758                 /* add "dec" to audio format name */
 759                 tmp = make_message("%sdec", audio_formats[i]);
 760                 for (j = 0; filters[j].name; j++)
 761                         if (!strcmp(tmp, filters[j].name))
 762                                 break;
 763                 free(tmp);
 764                 ret = -E_UNSUPPORTED_FILTER;
 765                 if (!filters[j].name)
 766                         goto out;
 767                 tmp = para_strdup(filters[j].name);
 768                 ret = add_filter(i, tmp);
 769                 free(tmp);
 770                 if (ret < 0)
 771                         goto out;
 772                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 773                         filters[j].name);
 774         }
 775 out:
 776         return ret;
 777 }
 778
 779 static int parse_filter_args(void)
 780 {
 781         int i, ret, nf;
 782
 783         nf = PARA_MAX(1U, conf.filter_given);
 784         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 785         FOR_EACH_AUDIO_FORMAT(i) {
 786                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 787                 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
 788         }
 789         if (!conf.no_default_filters_given)
 790                 return init_default_filters();
 791         for (i = 0; i < conf.filter_given; i++) {
 792                 char *arg = conf.filter_arg[i];
 793                 char *filter_name = strchr(arg, ':');
 794                 ret = -E_MISSING_COLON;
 795                 if (!filter_name)
 796                         goto out;
 797                 *filter_name = '\0';
 798                 filter_name++;
 799                 ret = get_audio_format_num(arg);
 800                 if (ret < 0)
 801                         goto out;
 802                 ret = add_filter(ret, filter_name);
 803                 if (ret < 0)
 804                         goto out;
 805         }
 806         ret = init_default_filters(); /* use default values for the rest */
 807 out:
 808         return ret;
 809 }
 810
 811 static int parse_stream_args(void)
 812 {
 813         int ret;
 814
 815         ret = parse_receiver_args();
 816         if (ret < 0)
 817                 return ret;
 818         ret = parse_filter_args();
 819         if (ret < 0)
 820                 return ret;
 821         ret = parse_writer_args();
 822         if (ret < 0)
 823                 return ret;
 824         return 1;
 825 }
 826
 827 /* does not unlink socket on errors */
 828 static int audiod_get_socket(void)
 829 {
 830         struct sockaddr_un unix_addr;
 831         int ret, fd;
 832
 833         if (conf.socket_given)
 834                 socket_name = para_strdup(conf.socket_arg);
 835         else {
 836                 char *hn = para_hostname();
 837                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 838                         hn);
 839                 free(hn);
 840         }
 841         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 842         if (conf.force_given)
 843                 unlink(socket_name);
 844         ret = create_local_socket(socket_name, &unix_addr,
 845                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 846         if (ret < 0)
 847                 goto err;
 848         fd = ret;
 849         if (listen(fd , 5) < 0) {
 850                 ret = -ERRNO_TO_PARA_ERROR(errno);
 851                 goto err;
 852         }
 853         ret = mark_fd_nonblocking(fd);
 854         if (ret < 0)
 855                 goto err;
 856         return fd;
 857 err:
 858         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 859         exit(EXIT_FAILURE);
 860 }
 861
 862 static void signal_pre_select(struct sched *s, struct task *t)
 863 {
 864         struct signal_task *st = container_of(t, struct signal_task, task);
 865         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 866 }
 867
 868 static void signal_post_select(struct sched *s, struct task *t)
 869 {
 870         struct signal_task *st = container_of(t, struct signal_task, task);
 871
 872         if (!FD_ISSET(st->fd, &s->rfds))
 873                 return;
 874
 875         st->signum = para_next_signal();
 876         switch (st->signum) {
 877         case SIGINT:
 878         case SIGTERM:
 879         case SIGHUP:
 880                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 881                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 882         }
 883 }
 884
 885 static void signal_setup_default(struct signal_task *st)
 886 {
 887         st->task.pre_select = signal_pre_select;
 888         st->task.post_select = signal_post_select;
 889         sprintf(st->task.status, "signal task");
 890 }
 891
 892 static void command_pre_select(struct sched *s, struct task *t)
 893 {
 894         struct command_task *ct = container_of(t, struct command_task, task);
 895         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 896 }
 897
 898 static void command_post_select(struct sched *s, struct task *t)
 899 {
 900         int ret;
 901         struct command_task *ct = container_of(t, struct command_task, task);
 902
 903         audiod_status_dump();
 904         if (!FD_ISSET(ct->fd, &s->rfds))
 905                 return;
 906         ret = handle_connect(ct->fd);
 907         if (ret < 0)
 908                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 909 }
 910
 911 static void init_command_task(struct command_task *ct)
 912 {
 913         ct->task.pre_select = command_pre_select;
 914         ct->task.post_select = command_post_select;
 915         ct->task.error = 0;
 916         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 917         sprintf(ct->task.status, "command task");
 918 }
 919
 920 static void close_stat_pipe(void)
 921 {
 922         int i;
 923
 924         if (!stat_task->ct)
 925                 return;
 926         client_close(stat_task->ct);
 927         stat_task->ct = NULL;
 928         FOR_EACH_STATUS_ITEM(i) {
 929                 free(stat_item_values[i]);
 930                 stat_item_values[i] = NULL;
 931         }
 932         dump_empty_status();
 933         stat_task->length_seconds = 0;
 934         stat_task->offset_seconds = 0;
 935         stat_task->vss_status = 0;
 936         audiod_status_dump();
 937 }
 938
 939 /**
 940  * close the connection to para_server and exit
 941  *
 942  * \param status the exit status which is passed to exit(3)
 943  * \param msg the log message
 944  *
 945  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
 946  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
 947  * EXIT_FAILURE.
 948  *
 949  * \sa exit(3)
 950  */
 951 void __noreturn clean_exit(int status, const char *msg)
 952 {
 953         PARA_EMERG_LOG("%s\n", msg);
 954         if (socket_name)
 955                 unlink(socket_name);
 956         close_stat_pipe();
 957         exit(status);
 958 }
 959
 960 /* avoid busy loop if server is down */
 961 static void set_stat_task_restart_barrier(unsigned seconds)
 962 {
 963         struct timeval delay = {seconds, 0};
 964         tv_add(now, &delay, &stat_task->restart_barrier);
 965 }
 966
 967 static void try_to_close_slot(int slot_num)
 968 {
 969         struct slot_info *s = &slot[slot_num];
 970
 971         if (s->format < 0)
 972                 return;
 973         if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
 974                 return;
 975         if (s->fc && s->fc->task.error != -E_TASK_UNREGISTERED)
 976                 return;
 977         if (s->wng && s->wng->task.error != -E_TASK_UNREGISTERED)
 978                 return;
 979         PARA_INFO_LOG("closing slot %d\n", slot_num);
 980         wng_close(s->wng);
 981         close_filters(s->fc);
 982         free(s->fc);
 983         close_receiver(slot_num);
 984         clear_slot(slot_num);
 985 }
 986
 987 /*
 988  * Check if any receivers/filters/writers need to be started and do so if
 989  * necessary.
 990  */
 991 static void start_stop_decoders(struct sched *s)
 992 {
 993         int i;
 994
 995         FOR_EACH_SLOT(i)
 996                 try_to_close_slot(i);
 997         if (audiod_status != AUDIOD_ON ||
 998                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
 999                 return kill_all_decoders(-E_NOT_PLAYING);
1000         open_current_receiver(s);
1001         FOR_EACH_SLOT(i) {
1002                 struct slot_info *sl = &slot[i];
1003                 struct audio_format_info *a;
1004                 struct timeval diff;
1005
1006                 if (sl->format < 0)
1007                         continue;
1008                 a = &afi[sl->format];
1009                 if (!sl->receiver_node)
1010                         continue;
1011                 if ((!a->num_filters || sl->fc) && sl->wng)
1012                         continue; /* everything already started */
1013                 if (!a->num_filters) {
1014                         if (sl->receiver_node->loaded && !sl->wng) {
1015                                 open_writers(i);
1016                         }
1017                         continue;
1018                 }
1019                 if (sl->receiver_node->loaded && !sl->fc) {
1020                         open_filters(i);
1021                         continue;
1022                 }
1023                 if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
1024                         continue;
1025                 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
1026                         open_writers(i);
1027                         continue;
1028                 }
1029                 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
1030                 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
1031                         s->timeout = diff;
1032                 }
1033         }
1034 }
1035
1036
1037 /* restart the client task if necessary */
1038 static void status_pre_select(struct sched *s, struct task *t)
1039 {
1040         struct status_task *st = container_of(t, struct status_task, task);
1041
1042         if (audiod_status == AUDIOD_OFF) {
1043                 if (!st->ct)
1044                         goto out;
1045                 if (st->ct->task.error >= 0) {
1046                         st->ct->task.error = -E_AUDIOD_OFF;
1047                         goto out;
1048                 }
1049                 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1050                         goto out;
1051                 close_stat_pipe();
1052                 st->clock_diff_count = conf.clock_diff_count_arg;
1053                 goto out;
1054         }
1055         if (st->ct) {
1056                 unsigned bytes_left;
1057                 if (st->ct->task.error < 0) {
1058                         if (st->ct->task.error != -E_TASK_UNREGISTERED)
1059                                 goto out;
1060                         close_stat_pipe();
1061                         goto out;
1062                 }
1063                 if (st->ct->status != CL_RECEIVING)
1064                         goto out;
1065                 bytes_left = for_each_line(st->ct->buf, st->ct->loaded,
1066                         &check_stat_line, NULL);
1067                 if (st->ct->loaded != bytes_left) {
1068                         st->last_status_read = *now;
1069                         st->ct->loaded = bytes_left;
1070                 } else {
1071                         struct timeval diff;
1072                         tv_diff(now, &st->last_status_read, &diff);
1073                         if (diff.tv_sec > 61)
1074                                 st->ct->task.error = -E_STATUS_TIMEOUT;
1075                 }
1076                 goto out;
1077         }
1078         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1079                 goto out;
1080         if (st->clock_diff_count) { /* get status only one time */
1081                 char *argv[] = {"audiod", "stat", "1", NULL};
1082                 int argc = 3;
1083                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1084                 st->clock_diff_count--;
1085                 client_open(argc, argv, &st->ct, NULL);
1086                 set_stat_task_restart_barrier(2);
1087
1088         } else {
1089                 char *argv[] = {"audiod", "stat", NULL};
1090                 int argc = 2;
1091                 client_open(argc, argv, &st->ct, NULL);
1092                 set_stat_task_restart_barrier(5);
1093         }
1094         free(stat_item_values[SI_BASENAME]);
1095         stat_item_values[SI_BASENAME] = make_message(
1096                 "%s: no connection to para_server\n",
1097                 status_item_list[SI_BASENAME]);
1098         stat_client_write(stat_item_values[SI_BASENAME],
1099                 SI_BASENAME);
1100         st->last_status_read = *now;
1101 out:
1102         start_stop_decoders(s);
1103 }
1104
1105 static void init_status_task(struct status_task *st)
1106 {
1107         memset(st, 0, sizeof(struct status_task));
1108         st->task.pre_select = status_pre_select;
1109         st->sa_time_diff_sign = 1;
1110         st->clock_diff_count = conf.clock_diff_count_arg;
1111         st->current_audio_format_num = -1;
1112         sprintf(st->task.status, "status task");
1113 }
1114
1115 static void set_initial_status(void)
1116 {
1117         audiod_status = AUDIOD_ON;
1118         if (!conf.mode_given)
1119                 return;
1120         if (!strcmp(conf.mode_arg, "sb")) {
1121                 audiod_status = AUDIOD_STANDBY;
1122                 return;
1123         }
1124         if (!strcmp(conf.mode_arg, "off")) {
1125                 audiod_status = AUDIOD_OFF;
1126                 return;
1127         }
1128         if (strcmp(conf.mode_arg, "on"))
1129                 PARA_WARNING_LOG("invalid mode\n");
1130 }
1131
1132 __noreturn static void print_help_and_die(void)
1133 {
1134         int d = conf.detailed_help_given;
1135         const char **p = d? audiod_args_info_detailed_help
1136                 : audiod_args_info_help;
1137
1138         printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1139                 AUDIOD_CMDLINE_PARSER_VERSION);
1140         printf_or_die("%s\n\n", audiod_args_info_usage);
1141         for (; *p; p++)
1142                 printf_or_die("%s\n", *p);
1143         print_receiver_helps(d);
1144         print_filter_helps(d);
1145         print_writer_helps(d);
1146         exit(0);
1147 }
1148
1149 static void init_colors_or_die(void)
1150 {
1151         int ret, i;
1152
1153         if (!want_colors())
1154                 return;
1155         daemon_set_default_log_colors();
1156         daemon_set_flag(DF_COLOR_LOG);
1157         for (i = 0; i < conf.log_color_given; i++) {
1158                 ret = daemon_set_log_color(conf.log_color_arg[i]);
1159                 if (ret < 0)
1160                         exit(EXIT_FAILURE);
1161         }
1162 }
1163
1164 /**
1165  * the main function of para_audiod
1166  *
1167  * \param argc usual argument count
1168  * \param argv usual argument vector
1169  *
1170  * \return EXIT_SUCCESS or EXIT_FAILURE
1171  *
1172  * \sa para_audiod(1)
1173  * */
1174 int main(int argc, char *argv[])
1175 {
1176         int ret, i;
1177         static struct sched s;
1178         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1179         struct audiod_cmdline_parser_params params = {
1180                 .override = 0,
1181                 .initialize = 1,
1182                 .check_required = 0,
1183                 .check_ambiguity = 0,
1184                 .print_errors = 1
1185         };
1186
1187         valid_fd_012();
1188         if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1189                 exit(EXIT_FAILURE);
1190         HANDLE_VERSION_FLAG("audiod", conf);
1191         /* init receivers/filters/writers early to make help work */
1192         recv_init();
1193         filter_init();
1194         writer_init();
1195         if (conf.help_given || conf.detailed_help_given)
1196                 print_help_and_die();
1197         drop_privileges_or_die(conf.user_arg, conf.group_arg);
1198         parse_config_or_die();
1199         init_colors_or_die();
1200         daemon_set_flag(DF_LOG_TIME);
1201         daemon_set_flag(DF_LOG_HOSTNAME);
1202         daemon_set_flag(DF_LOG_LL);
1203         if (conf.logfile_given) {
1204                 daemon_set_logfile(conf.logfile_arg);
1205                 daemon_open_log_or_die();
1206         }
1207         ret = parse_stream_args();
1208         if (ret < 0) {
1209                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1210                 exit(EXIT_FAILURE);
1211         }
1212         log_welcome("para_audiod");
1213         server_uptime(UPTIME_SET);
1214         set_initial_status();
1215         FOR_EACH_SLOT(i)
1216                 clear_slot(i);
1217         init_grabbing();
1218         setup_signal_handling();
1219         signal_setup_default(sig_task);
1220
1221         init_status_task(stat_task);
1222         init_command_task(cmd_task);
1223
1224         if (conf.daemon_given)
1225                 daemonize();
1226
1227         register_task(&sig_task->task);
1228         register_task(&cmd_task->task);
1229         register_task(&stat_task->task);
1230         s.default_timeout.tv_sec = 0;
1231         s.default_timeout.tv_usec = 99 * 1000;
1232         ret = schedule(&s);
1233
1234         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1235         return EXIT_FAILURE;
1236 }