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