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         stat_task->current_audio_format_num = -1;
 316 }
 317
 318 static void kill_all_decoders(int error)
 319 {
 320         int i;
 321
 322         FOR_EACH_SLOT(i) {
 323                 struct slot_info *s = &slot[i];
 324                 if (s->wng && s->wng->task.error >= 0) {
 325                         PARA_INFO_LOG("deactivating wng in slot %d\n",
 326                                 i);
 327                         s->wng->task.error = error;
 328                 }
 329                 if (s->fc && s->fc->task.error >= 0) {
 330                         PARA_INFO_LOG("deactivatimg filter chain in slot %d\n", i);
 331                         s->fc->task.error = error;
 332                 }
 333                 if (s->receiver_node && s->receiver_node->task.error >= 0) {
 334                         PARA_INFO_LOG("deactivating receiver_node in slot %d\n", i);
 335                         s->receiver_node->task.error = error;
 336                 }
 337         }
 338 }
 339
 340 static int get_empty_slot(void)
 341 {
 342         int i;
 343         struct slot_info *s;
 344
 345         FOR_EACH_SLOT(i) {
 346                 s = &slot[i];
 347                 if (s->format < 0) {
 348                         clear_slot(i);
 349                         return i;
 350                 }
 351                 if (s->wng || s->receiver_node || s->fc)
 352                         continue;
 353                 clear_slot(i);
 354                 return i;
 355         }
 356         return -E_NO_MORE_SLOTS;
 357 }
 358
 359 /**
 360  * get the number of filters
 361  *
 362  * \param audio_format_num the number identifying the audio format
 363  *
 364  * \return the number of filters for the given audio format
 365  *
 366  * \sa struct filter;
 367  */
 368 int num_filters(int audio_format_num)
 369 {
 370         return afi[audio_format_num].num_filters;
 371 }
 372
 373 static void open_filters(int slot_num)
 374 {
 375         struct slot_info *s = &slot[slot_num];
 376         struct audio_format_info *a = &afi[s->format];
 377         struct filter_node *fn;
 378         int nf = a->num_filters;
 379         int i;
 380
 381         s->fc = NULL;
 382         if (!nf)
 383                 return;
 384         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 385         s->fc = para_calloc(sizeof(struct filter_chain));
 386         s->fc->filter_nodes = para_malloc(nf * sizeof(struct filter_node));
 387         s->fc->inbufp = &s->receiver_node->buf;
 388         s->fc->in_loaded = &s->receiver_node->loaded;
 389         s->fc->input_error = &s->receiver_node->task.error;
 390         s->fc->task.pre_select = NULL;
 391         s->fc->task.post_select = filter_post_select;
 392         s->fc->task.error = 0;
 393         s->fc->num_filters = nf;
 394
 395         s->receiver_node->output_error = &s->fc->task.error;
 396         sprintf(s->fc->task.status, "filter chain");
 397         FOR_EACH_FILTER_NODE(fn, s->fc, i) {
 398                 struct filter *f = filters + a->filter_nums[i];
 399                 fn->filter_num = a->filter_nums[i];
 400                 fn->conf = a->filter_conf[i];
 401                 fn->fc = s->fc;
 402                 fn->loaded = 0;
 403                 INIT_LIST_HEAD(&fn->callbacks);
 404                 f->open(fn);
 405                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 406                         audio_formats[s->format], i,  nf, f->name, slot_num);
 407                 s->fc->outbufp = &fn->buf;
 408                 s->fc->out_loaded = &fn->loaded;
 409         }
 410         register_task(&s->fc->task);
 411 }
 412
 413 static void open_writers(int slot_num)
 414 {
 415         int ret, i;
 416         struct slot_info *s = &slot[slot_num];
 417         struct audio_format_info *a = &afi[s->format];
 418
 419         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 420         if (!a->num_writers)
 421                 s->wng = setup_default_wng();
 422         else
 423                 s->wng = wng_new(a->num_writers);
 424         if (s->fc) {
 425                 s->wng->bufp = s->fc->outbufp;
 426                 s->wng->loaded = s->fc->out_loaded;
 427                 s->wng->input_error = &s->fc->task.error;
 428                 s->wng->channels = &s->fc->channels;
 429                 s->wng->samplerate = &s->fc->samplerate;
 430                 s->fc->output_error = &s->wng->task.error;
 431                 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
 432         } else {
 433                 s->wng->bufp = &s->receiver_node->buf;
 434                 s->wng->loaded = &s->receiver_node->loaded;
 435                 s->wng->input_error = &s->receiver_node->task.error;
 436         }
 437         for (i = 0; i < a->num_writers; i++) {
 438                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 439                 s->wng->writer_nodes[i].writer_num = a->writer_nums[i];
 440         }
 441         ret = wng_open(s->wng);
 442         if (ret < 0)
 443                 return;
 444         s->wstime = *now;
 445         s->server_stream_start = stat_task->server_stream_start.tv_sec?
 446                 stat_task->server_stream_start : *now;
 447         s->offset_seconds = stat_task->offset_seconds;
 448         s->seconds_total = stat_task->length_seconds;
 449         activate_inactive_grab_clients(s->format, s->fc);
 450 }
 451
 452 static int open_receiver(int format)
 453 {
 454         struct audio_format_info *a = &afi[format];
 455         struct slot_info *s;
 456         int ret, slot_num;
 457         struct receiver_node *rn;
 458         const struct timeval restart_delay = {2, 0};
 459
 460         ret = get_empty_slot();
 461         if (ret < 0)
 462                 goto err;
 463         slot_num = ret;
 464         s = &slot[slot_num];
 465         s->format = format;
 466         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 467         rn = s->receiver_node;
 468         rn->receiver = a->receiver;
 469         rn->conf = a->receiver_conf;
 470         ret = a->receiver->open(s->receiver_node);
 471         if (ret < 0) {
 472                 free(s->receiver_node);
 473                 s->receiver_node = NULL;
 474                 goto err;
 475         }
 476         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 477                 audio_formats[s->format], a->receiver->name, slot_num);
 478         rn->task.pre_select = a->receiver->pre_select;
 479         rn->task.post_select = a->receiver->post_select;
 480         s->rstime = *now;
 481         sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
 482         register_task(&rn->task);
 483         ret = 1;
 484 err:
 485         if (ret < 0)
 486                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 487         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 488         return ret;
 489 }
 490
 491 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
 492 static int receiver_running(int format)
 493 {
 494         int i, ret = 0;
 495
 496         FOR_EACH_SLOT(i) {
 497                 struct slot_info *s = &slot[i];
 498                 if (s->format != format)
 499                         continue;
 500                 if (!s->receiver_node)
 501                         continue;
 502                 if (s->receiver_node->task.error >= 0)
 503                         return 1;
 504                 ret = -1;
 505         }
 506         return ret;
 507 }
 508
 509 static void open_current_receiver(struct sched *s)
 510 {
 511         struct timeval diff;
 512         int ret, cafn = stat_task->current_audio_format_num;
 513
 514         if (cafn < 0 || !stat_task->ct)
 515                 return;
 516         /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
 517         if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
 518                 return;
 519         ret = receiver_running(cafn);
 520         if (ret > 0) /* already running and not eof */
 521                 return;
 522         if (ret < 0) { /* eof */
 523                 /*
 524                  * para_server uses a zero start time during the announcement
 525                  * period, i.e. before it sends the first chunk. Wait until
 526                  * this period begins to avoid restarting the receiver that
 527                  * belongs to the file just completed.
 528                  */
 529                 if (stat_task->server_stream_start.tv_sec)
 530                         return;
 531         }
 532         if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
 533                 /* avoid busy loop */
 534                 s->timeout = diff;
 535                 return;
 536         }
 537         /* start a new receiver */
 538         open_receiver(cafn);
 539 }
 540
 541 static unsigned compute_time_diff(const struct timeval *status_time)
 542 {
 543         struct timeval tmp, diff;
 544         static unsigned count;
 545         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 546         const struct timeval max_deviation = {0, 500 * 1000};
 547         const int time_smooth = 5;
 548
 549         if (!status_time)
 550                 return count;
 551         sign = tv_diff(status_time, now, &diff);
 552 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 553 //                      sign, sa_time_diff_sign);
 554         if (!count) {
 555                 sa_time_diff_sign = sign;
 556                 stat_task->sa_time_diff = diff;
 557                 count++;
 558                 goto out;
 559         }
 560         if (count > 5) {
 561                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 562                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 563                         PARA_WARNING_LOG("time diff jump: %lims\n",
 564                                 s * tv2ms(&tmp));
 565         }
 566         count++;
 567         sa_time_diff_sign = tv_convex_combination(
 568                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 569                 count > 10? sign : sign * time_smooth, &diff,
 570                 &tmp);
 571         stat_task->sa_time_diff = tmp;
 572         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 573                 sign > 0? "+" : "-",
 574                 tv2ms(&diff),
 575                 sa_time_diff_sign ? "+" : "-",
 576                 tv2ms(&stat_task->sa_time_diff)
 577         );
 578 out:
 579         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 580         return count;
 581 }
 582
 583 static int update_item(int itemnum, char *buf)
 584 {
 585         long unsigned sec, usec;
 586
 587         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 588                 return 1;
 589         free(stat_item_values[itemnum]);
 590         stat_item_values[itemnum] = para_strdup(buf);
 591         stat_client_write_item(itemnum);
 592         switch (itemnum) {
 593         case SI_STATUS_FLAGS:
 594                 stat_task->vss_status = 0;
 595                 if (strchr(buf, 'N'))
 596                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 597                 if (strchr(buf, 'P'))
 598                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 599                 break;
 600         case SI_OFFSET:
 601                 stat_task->offset_seconds = atoi(buf);
 602                 break;
 603         case SI_SECONDS_TOTAL:
 604                 stat_task->length_seconds = atoi(buf);
 605                 break;
 606         case SI_STREAM_START:
 607                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 608                         struct timeval a_start, delay;
 609                         delay.tv_sec = conf.stream_delay_arg / 1000;
 610                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 611                         stat_task->server_stream_start.tv_sec = sec;
 612                         stat_task->server_stream_start.tv_usec = usec;
 613                         if (compute_time_diff(NULL) > 2) {
 614                                 if (stat_task->sa_time_diff_sign < 0)
 615                                         tv_add(&stat_task->server_stream_start,
 616                                                 &stat_task->sa_time_diff, &a_start);
 617                                 else
 618                                         tv_diff(&stat_task->server_stream_start,
 619                                                 &stat_task->sa_time_diff, &a_start);
 620                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 621                         }
 622                 }
 623                 break;
 624         case SI_CURRENT_TIME:
 625                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 626                         struct timeval tv = {sec, usec};
 627                         compute_time_diff(&tv);
 628                 }
 629                 break;
 630         case SI_FORMAT:
 631                 stat_task->current_audio_format_num
 632                         = get_audio_format_num(buf);
 633         }
 634         return 1;
 635 }
 636
 637 static int parse_stream_command(const char *txt, char **cmd)
 638 {
 639         char *p = strchr(txt, ':');
 640         int i;
 641
 642         if (!p)
 643                 return -E_MISSING_COLON;
 644         p++;
 645         FOR_EACH_AUDIO_FORMAT(i) {
 646                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 647                         continue;
 648                 *cmd = p;
 649                 return i;
 650         }
 651         return -E_UNSUPPORTED_AUDIO_FORMAT;
 652 }
 653
 654 static int add_filter(int format, char *cmdline)
 655 {
 656         struct audio_format_info *a = &afi[format];
 657         int filter_num, nf = a->num_filters;
 658
 659         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 660         if (filter_num < 0)
 661                 return filter_num;
 662         a->filter_nums[nf] = filter_num;
 663         a->num_filters++;
 664         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 665                 filters[filter_num].name);
 666         return filter_num;
 667 }
 668
 669 static int parse_writer_args(void)
 670 {
 671         int i, ret, nw;
 672         char *cmd;
 673         struct audio_format_info *a;
 674
 675         nw = PARA_MAX(1U, conf.writer_given);
 676         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 677         FOR_EACH_AUDIO_FORMAT(i) {
 678                 a = &afi[i];
 679                 a->writer_conf = para_malloc(nw * sizeof(void *));
 680                 a->writer_nums = para_malloc(nw * sizeof(int));
 681                 a->num_writers = 0;
 682         }
 683         for (i = 0; i < conf.writer_given; i++) {
 684                 void *wconf;
 685                 int writer_num;
 686                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 687                 if (ret < 0)
 688                         goto out;
 689                 a = &afi[ret];
 690                 nw = a->num_writers;
 691                 wconf = check_writer_arg(cmd, &writer_num);
 692                 if (!wconf) {
 693                         ret = writer_num;
 694                         goto out;
 695                 }
 696                 a->writer_nums[nw] = writer_num;
 697                 a->writer_conf[nw] = wconf;
 698                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 699                         nw, writer_names[writer_num]);
 700                 a->num_writers++;
 701         }
 702         ret = 1;
 703 out:
 704         return ret;
 705 }
 706
 707 static int parse_receiver_args(void)
 708 {
 709         int i, ret, receiver_num;
 710         char *cmd = NULL;
 711         struct audio_format_info *a;
 712
 713         for (i = conf.receiver_given - 1; i >= 0; i--) {
 714                 char *arg = conf.receiver_arg[i];
 715                 char *recv_arg = strchr(arg, ':');
 716                 ret = -E_MISSING_COLON;
 717                 if (!recv_arg)
 718                         goto out;
 719                 *recv_arg = '\0';
 720                 recv_arg++;
 721                 ret = get_audio_format_num(arg);
 722                 if (ret < 0)
 723                         goto out;
 724                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 725                 if (!afi[ret].receiver_conf) {
 726                         ret = -E_RECV_SYNTAX;
 727                         goto out;
 728                 }
 729                 afi[ret].receiver = &receivers[receiver_num];
 730         }
 731         /* use the first available receiver with no arguments
 732          * for those audio formats for which no receiver
 733          * was specified
 734          */
 735         cmd = para_strdup(receivers[0].name);
 736         FOR_EACH_AUDIO_FORMAT(i) {
 737                 a = &afi[i];
 738                 if (a->receiver_conf)
 739                         continue;
 740                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 741                 if (!a->receiver_conf)
 742                         return -E_RECV_SYNTAX;
 743                 a->receiver = &receivers[receiver_num];
 744         }
 745         ret = 1;
 746 out:
 747         free(cmd);
 748         return ret;
 749 }
 750
 751 static int init_default_filters(void)
 752 {
 753         int i, ret = 1;
 754
 755         FOR_EACH_AUDIO_FORMAT(i) {
 756                 struct audio_format_info *a = &afi[i];
 757                 char *tmp;
 758                 int j;
 759
 760                 if (a->num_filters)
 761                         continue; /* no default -- nothing to to */
 762                 /* add "dec" to audio format name */
 763                 tmp = make_message("%sdec", audio_formats[i]);
 764                 for (j = 0; filters[j].name; j++)
 765                         if (!strcmp(tmp, filters[j].name))
 766                                 break;
 767                 free(tmp);
 768                 ret = -E_UNSUPPORTED_FILTER;
 769                 if (!filters[j].name)
 770                         goto out;
 771                 tmp = para_strdup(filters[j].name);
 772                 ret = add_filter(i, tmp);
 773                 free(tmp);
 774                 if (ret < 0)
 775                         goto out;
 776                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 777                         filters[j].name);
 778         }
 779 out:
 780         return ret;
 781 }
 782
 783 static int parse_filter_args(void)
 784 {
 785         int i, ret, nf;
 786
 787         nf = PARA_MAX(1U, conf.filter_given);
 788         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 789         FOR_EACH_AUDIO_FORMAT(i) {
 790                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 791                 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
 792         }
 793         if (!conf.no_default_filters_given)
 794                 return init_default_filters();
 795         for (i = 0; i < conf.filter_given; i++) {
 796                 char *arg = conf.filter_arg[i];
 797                 char *filter_name = strchr(arg, ':');
 798                 ret = -E_MISSING_COLON;
 799                 if (!filter_name)
 800                         goto out;
 801                 *filter_name = '\0';
 802                 filter_name++;
 803                 ret = get_audio_format_num(arg);
 804                 if (ret < 0)
 805                         goto out;
 806                 ret = add_filter(ret, filter_name);
 807                 if (ret < 0)
 808                         goto out;
 809         }
 810         ret = init_default_filters(); /* use default values for the rest */
 811 out:
 812         return ret;
 813 }
 814
 815 static int parse_stream_args(void)
 816 {
 817         int ret;
 818
 819         ret = parse_receiver_args();
 820         if (ret < 0)
 821                 return ret;
 822         ret = parse_filter_args();
 823         if (ret < 0)
 824                 return ret;
 825         ret = parse_writer_args();
 826         if (ret < 0)
 827                 return ret;
 828         return 1;
 829 }
 830
 831 /* does not unlink socket on errors */
 832 static int audiod_get_socket(void)
 833 {
 834         struct sockaddr_un unix_addr;
 835         int ret, fd;
 836
 837         if (conf.socket_given)
 838                 socket_name = para_strdup(conf.socket_arg);
 839         else {
 840                 char *hn = para_hostname();
 841                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 842                         hn);
 843                 free(hn);
 844         }
 845         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 846         if (conf.force_given)
 847                 unlink(socket_name);
 848         ret = create_local_socket(socket_name, &unix_addr,
 849                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 850         if (ret < 0)
 851                 goto err;
 852         fd = ret;
 853         if (listen(fd , 5) < 0) {
 854                 ret = -ERRNO_TO_PARA_ERROR(errno);
 855                 goto err;
 856         }
 857         ret = mark_fd_nonblocking(fd);
 858         if (ret < 0)
 859                 goto err;
 860         return fd;
 861 err:
 862         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 863         exit(EXIT_FAILURE);
 864 }
 865
 866 static void signal_pre_select(struct sched *s, struct task *t)
 867 {
 868         struct signal_task *st = container_of(t, struct signal_task, task);
 869         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 870 }
 871
 872 static void signal_post_select(struct sched *s, struct task *t)
 873 {
 874         struct signal_task *st = container_of(t, struct signal_task, task);
 875
 876         if (!FD_ISSET(st->fd, &s->rfds))
 877                 return;
 878
 879         st->signum = para_next_signal();
 880         switch (st->signum) {
 881         case SIGINT:
 882         case SIGTERM:
 883         case SIGHUP:
 884                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 885                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 886         }
 887 }
 888
 889 static void signal_setup_default(struct signal_task *st)
 890 {
 891         st->task.pre_select = signal_pre_select;
 892         st->task.post_select = signal_post_select;
 893         sprintf(st->task.status, "signal task");
 894 }
 895
 896 static void command_pre_select(struct sched *s, struct task *t)
 897 {
 898         struct command_task *ct = container_of(t, struct command_task, task);
 899         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 900 }
 901
 902 static void command_post_select(struct sched *s, struct task *t)
 903 {
 904         int ret;
 905         struct command_task *ct = container_of(t, struct command_task, task);
 906         static struct timeval last_status_dump;
 907         struct timeval tmp;
 908
 909         tv_add(&last_status_dump, &(struct timeval){0, 500 * 1000}, &tmp);
 910         if (tv_diff(&tmp, now, NULL) < 0) {
 911                 audiod_status_dump();
 912                 last_status_dump = *now;
 913         }
 914
 915         if (!FD_ISSET(ct->fd, &s->rfds))
 916                 return;
 917         ret = handle_connect(ct->fd);
 918         if (ret < 0)
 919                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 920 }
 921
 922 static void init_command_task(struct command_task *ct)
 923 {
 924         ct->task.pre_select = command_pre_select;
 925         ct->task.post_select = command_post_select;
 926         ct->task.error = 0;
 927         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 928         sprintf(ct->task.status, "command task");
 929 }
 930
 931 static void close_stat_pipe(void)
 932 {
 933         if (!stat_task->ct)
 934                 return;
 935         client_close(stat_task->ct);
 936         stat_task->ct = NULL;
 937         clear_and_dump_items();
 938         stat_task->length_seconds = 0;
 939         stat_task->offset_seconds = 0;
 940         stat_task->vss_status = 0;
 941         stat_task->current_audio_format_num = -1;
 942         audiod_status_dump();
 943 }
 944
 945 /**
 946  * close the connection to para_server and exit
 947  *
 948  * \param status the exit status which is passed to exit(3)
 949  * \param msg the log message
 950  *
 951  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
 952  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
 953  * EXIT_FAILURE.
 954  *
 955  * \sa exit(3)
 956  */
 957 void __noreturn clean_exit(int status, const char *msg)
 958 {
 959         PARA_EMERG_LOG("%s\n", msg);
 960         if (socket_name)
 961                 unlink(socket_name);
 962         close_stat_pipe();
 963         exit(status);
 964 }
 965
 966 /* avoid busy loop if server is down */
 967 static void set_stat_task_restart_barrier(unsigned seconds)
 968 {
 969         struct timeval delay = {seconds, 0};
 970         tv_add(now, &delay, &stat_task->restart_barrier);
 971 }
 972
 973 static void try_to_close_slot(int slot_num)
 974 {
 975         struct slot_info *s = &slot[slot_num];
 976
 977         if (s->format < 0)
 978                 return;
 979         if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
 980                 return;
 981         if (s->fc && s->fc->task.error != -E_TASK_UNREGISTERED)
 982                 return;
 983         if (s->wng && s->wng->task.error != -E_TASK_UNREGISTERED)
 984                 return;
 985         PARA_INFO_LOG("closing slot %d\n", slot_num);
 986         wng_close(s->wng);
 987         close_filters(s->fc);
 988         free(s->fc);
 989         close_receiver(slot_num);
 990         clear_slot(slot_num);
 991 }
 992
 993 /*
 994  * Check if any receivers/filters/writers need to be started and do so if
 995  * necessary.
 996  */
 997 static void start_stop_decoders(struct sched *s)
 998 {
 999         int i;
1000
1001         FOR_EACH_SLOT(i)
1002                 try_to_close_slot(i);
1003         if (audiod_status != AUDIOD_ON ||
1004                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1005                 return kill_all_decoders(-E_NOT_PLAYING);
1006         open_current_receiver(s);
1007         FOR_EACH_SLOT(i) {
1008                 struct slot_info *sl = &slot[i];
1009                 struct audio_format_info *a;
1010                 struct timeval diff;
1011
1012                 if (sl->format < 0)
1013                         continue;
1014                 a = &afi[sl->format];
1015                 if (!sl->receiver_node)
1016                         continue;
1017                 if ((!a->num_filters || sl->fc) && sl->wng)
1018                         continue; /* everything already started */
1019                 if (!a->num_filters) {
1020                         if (sl->receiver_node->loaded && !sl->wng) {
1021                                 open_writers(i);
1022                         }
1023                         continue;
1024                 }
1025                 if (sl->receiver_node->loaded && !sl->fc) {
1026                         open_filters(i);
1027                         continue;
1028                 }
1029                 if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
1030                         continue;
1031                 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
1032                         open_writers(i);
1033                         continue;
1034                 }
1035                 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
1036                 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
1037                         s->timeout = diff;
1038                 }
1039         }
1040 }
1041
1042
1043 /* restart the client task if necessary */
1044 static void status_pre_select(struct sched *s, struct task *t)
1045 {
1046         struct status_task *st = container_of(t, struct status_task, task);
1047
1048         if (audiod_status == AUDIOD_OFF) {
1049                 if (!st->ct)
1050                         goto out;
1051                 if (st->ct->task.error >= 0) {
1052                         st->ct->task.error = -E_AUDIOD_OFF;
1053                         goto out;
1054                 }
1055                 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1056                         goto out;
1057                 close_stat_pipe();
1058                 st->clock_diff_count = conf.clock_diff_count_arg;
1059                 goto out;
1060         }
1061         if (st->ct) {
1062                 int ret;
1063                 if (st->ct->task.error < 0) {
1064                         if (st->ct->task.error != -E_TASK_UNREGISTERED)
1065                                 goto out;
1066                         close_stat_pipe();
1067                         goto out;
1068                 }
1069                 if (st->ct->status != CL_RECEIVING)
1070                         goto out;
1071                 ret = for_each_stat_item(st->ct->buf, st->ct->loaded,
1072                         update_item);
1073                 if (ret < 0) {
1074                         st->ct->task.error = ret;
1075                         goto out;
1076                 }
1077                 if (st->ct->loaded != ret) {
1078                         st->last_status_read = *now;
1079                         st->ct->loaded = ret;
1080                 } else {
1081                         struct timeval diff;
1082                         tv_diff(now, &st->last_status_read, &diff);
1083                         if (diff.tv_sec > 61)
1084                                 st->ct->task.error = -E_STATUS_TIMEOUT;
1085                 }
1086                 goto out;
1087         }
1088         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1089                 goto out;
1090         if (st->clock_diff_count) { /* get status only one time */
1091                 char *argv[] = {"audiod", "--", "stat", "-p", "1", NULL};
1092                 int argc = 5;
1093                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1094                 st->clock_diff_count--;
1095                 client_open(argc, argv, &st->ct, NULL);
1096                 set_stat_task_restart_barrier(2);
1097
1098         } else {
1099                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1100                 int argc = 4;
1101                 client_open(argc, argv, &st->ct, NULL);
1102                 set_stat_task_restart_barrier(5);
1103         }
1104         free(stat_item_values[SI_BASENAME]);
1105         stat_item_values[SI_BASENAME] = para_strdup(
1106                 "no connection to para_server");
1107         stat_client_write_item(SI_BASENAME);
1108         st->last_status_read = *now;
1109 out:
1110         start_stop_decoders(s);
1111 }
1112
1113 static void init_status_task(struct status_task *st)
1114 {
1115         memset(st, 0, sizeof(struct status_task));
1116         st->task.pre_select = status_pre_select;
1117         st->sa_time_diff_sign = 1;
1118         st->clock_diff_count = conf.clock_diff_count_arg;
1119         st->current_audio_format_num = -1;
1120         sprintf(st->task.status, "status task");
1121 }
1122
1123 static void set_initial_status(void)
1124 {
1125         audiod_status = AUDIOD_ON;
1126         if (!conf.mode_given)
1127                 return;
1128         if (!strcmp(conf.mode_arg, "sb")) {
1129                 audiod_status = AUDIOD_STANDBY;
1130                 return;
1131         }
1132         if (!strcmp(conf.mode_arg, "off")) {
1133                 audiod_status = AUDIOD_OFF;
1134                 return;
1135         }
1136         if (strcmp(conf.mode_arg, "on"))
1137                 PARA_WARNING_LOG("invalid mode\n");
1138 }
1139
1140 __noreturn static void print_help_and_die(void)
1141 {
1142         int d = conf.detailed_help_given;
1143         const char **p = d? audiod_args_info_detailed_help
1144                 : audiod_args_info_help;
1145
1146         printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1147                 AUDIOD_CMDLINE_PARSER_VERSION);
1148         printf_or_die("%s\n\n", audiod_args_info_usage);
1149         for (; *p; p++)
1150                 printf_or_die("%s\n", *p);
1151         print_receiver_helps(d);
1152         print_filter_helps(d);
1153         print_writer_helps(d);
1154         exit(0);
1155 }
1156
1157 static void init_colors_or_die(void)
1158 {
1159         int ret, i;
1160
1161         if (!want_colors())
1162                 return;
1163         daemon_set_default_log_colors();
1164         daemon_set_flag(DF_COLOR_LOG);
1165         for (i = 0; i < conf.log_color_given; i++) {
1166                 ret = daemon_set_log_color(conf.log_color_arg[i]);
1167                 if (ret < 0)
1168                         exit(EXIT_FAILURE);
1169         }
1170 }
1171
1172 /**
1173  * the main function of para_audiod
1174  *
1175  * \param argc usual argument count
1176  * \param argv usual argument vector
1177  *
1178  * \return EXIT_SUCCESS or EXIT_FAILURE
1179  *
1180  * \sa para_audiod(1)
1181  * */
1182 int main(int argc, char *argv[])
1183 {
1184         int ret, i;
1185         static struct sched s;
1186         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1187         struct audiod_cmdline_parser_params params = {
1188                 .override = 0,
1189                 .initialize = 1,
1190                 .check_required = 0,
1191                 .check_ambiguity = 0,
1192                 .print_errors = 1
1193         };
1194
1195         valid_fd_012();
1196         if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1197                 exit(EXIT_FAILURE);
1198         HANDLE_VERSION_FLAG("audiod", conf);
1199         /* init receivers/filters/writers early to make help work */
1200         recv_init();
1201         filter_init();
1202         writer_init();
1203         if (conf.help_given || conf.detailed_help_given)
1204                 print_help_and_die();
1205         drop_privileges_or_die(conf.user_arg, conf.group_arg);
1206         parse_config_or_die();
1207         init_colors_or_die();
1208         init_random_seed_or_die();
1209         daemon_set_flag(DF_LOG_TIME);
1210         daemon_set_flag(DF_LOG_HOSTNAME);
1211         daemon_set_flag(DF_LOG_LL);
1212         if (conf.log_timing_given)
1213                 daemon_set_flag(DF_LOG_TIMING);
1214         if (conf.logfile_given) {
1215                 daemon_set_logfile(conf.logfile_arg);
1216                 daemon_open_log_or_die();
1217         }
1218         ret = parse_stream_args();
1219         if (ret < 0) {
1220                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1221                 exit(EXIT_FAILURE);
1222         }
1223         log_welcome("para_audiod");
1224         server_uptime(UPTIME_SET);
1225         set_initial_status();
1226         FOR_EACH_SLOT(i)
1227                 clear_slot(i);
1228         init_grabbing();
1229         setup_signal_handling();
1230         signal_setup_default(sig_task);
1231
1232         init_status_task(stat_task);
1233         init_command_task(cmd_task);
1234
1235         if (conf.daemon_given)
1236                 daemonize();
1237
1238         register_task(&sig_task->task);
1239         register_task(&cmd_task->task);
1240         register_task(&stat_task->task);
1241         s.default_timeout.tv_sec = 0;
1242         s.default_timeout.tv_usec = 999 * 1000;
1243         ret = schedule(&s);
1244
1245         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1246         return EXIT_FAILURE;
1247 }