audiod.c

   1 /*
   2  * Copyright (C) 2005-2008 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file audiod.c the paraslash's audio daemon */
   8 #include <sys/types.h>
   9 #include <dirent.h>
  10
  11 #include "para.h"
  12 #include "error.h"
  13 #include "audiod.cmdline.h"
  14 #include "list.h"
  15 #include "sched.h"
  16 #include "recv.h"
  17 #include "filter.h"
  18 #include "grab_client.cmdline.h"
  19 #include "grab_client.h"
  20 #include "client.cmdline.h"
  21 #include "client.h"
  22 #include "audiod.h"
  23 #include "net.h"
  24 #include "daemon.h"
  25 #include "string.h"
  26 #include "fd.h"
  27 #include "write.h"
  28 #include "write_common.h"
  29 #include "signal.h"
  30
  31 /** define the array of error lists needed by para_audiod */
  32 INIT_AUDIOD_ERRLISTS;
  33 /** define the array containing all supported audio formats */
  34 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
  35
  36 /** Defines how audiod handles one supported audio format. */
  37 struct audio_format_info {
  38         /** pointer to the receiver for this audio format */
  39         struct receiver *receiver;
  40         /** the receiver configuration */
  41         void *receiver_conf;
  42         /** the number of filters that should be activated for this audio format */
  43         unsigned int num_filters;
  44         /** pointer to the array of filters to be activated */
  45         struct filter **filters;
  46         /** pointer to the array of filter configurations */
  47         void **filter_conf;
  48         /** the number of filters that should be activated for this audio format */
  49         unsigned int num_writers;
  50         /** pointer to the array of writers to be activated */
  51         struct writer **writers;
  52         /** pointer to the array of writer configurations */
  53         void **writer_conf;
  54         /** do not start receiver/filters/writer before this time */
  55         struct timeval restart_barrier;
  56 };
  57
  58 /**
  59  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  60  * be associated with a receiver/filter/writer triple. This array holds all
  61  * information on the status of these slots.
  62  *
  63  * \sa struct slot_info
  64  * */
  65 struct slot_info slot[MAX_STREAM_SLOTS];
  66
  67
  68 /**
  69  * the current mode of operation of which can be changed by the on/off/cycle
  70  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
  71  */
  72 int audiod_status = AUDIOD_ON;
  73
  74 /**
  75  * the gengetopt args_info struct that holds information on all command line
  76  * arguments
  77  */
  78 struct audiod_args_info conf;
  79
  80 static char *socket_name;
  81 static FILE *logfile;
  82 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
  83
  84 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
  85
  86 static struct status_task status_task_struct;
  87
  88 /**
  89  * the task that calls the status command of para_server
  90  *
  91  * \sa struct status_task
  92  */
  93 struct status_task *stat_task = &status_task_struct;
  94 static struct timeval initial_delay_barrier;
  95
  96 /**
  97  * the task for handling audiod commands
  98  *
  99  * \sa struct task, struct sched
 100  */
 101 struct command_task {
 102         /** the local listening socket */
 103         int fd;
 104         /** the associated task structure */
 105         struct task task;
 106 };
 107
 108 /** iterate over all supported audio formats */
 109 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 110
 111 /**
 112  * get the audio format number
 113  * \param name the name of the audio format
 114  *
 115  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 116  * \a name is not a supported audio format.
 117  */
 118 int get_audio_format_num(char *name)
 119 {
 120         int i;
 121
 122         while (para_isspace(*name))
 123                 name++;
 124         FOR_EACH_AUDIO_FORMAT(i)
 125                 if (!strcmp(name, audio_formats[i]))
 126                         return i;
 127         return -E_UNSUPPORTED_AUDIO_FORMAT;
 128 }
 129
 130 /**
 131  * the log function of para_audiod
 132  *
 133  * \param ll loglevel
 134  * \param fmt the format string
 135  */
 136 void para_log(int ll, const char* fmt,...)
 137 {
 138         va_list argp;
 139         FILE *outfd;
 140         struct tm *tm;
 141         time_t t1;
 142         char str[MAXLINE] = "";
 143         static char *hostname;
 144
 145         if (ll < conf.loglevel_arg)
 146                 return;
 147         if (!hostname)
 148                 hostname = para_hostname();
 149         outfd = logfile? logfile : stderr;
 150         time(&t1);
 151         tm = localtime(&t1);
 152         strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
 153         fprintf(outfd, "%s %s ", str, hostname);
 154         if (conf.loglevel_arg <= INFO)
 155                 fprintf(outfd, "%i ", ll);
 156         va_start(argp, fmt);
 157         vfprintf(outfd, fmt, argp);
 158         va_end(argp);
 159 }
 160
 161 static char *configfile_exists(void)
 162 {
 163         char *home = para_homedir();
 164         char *config_file = make_message("%s/.paraslash/audiod.conf",
 165                 home);
 166         free(home);
 167         if (file_exists(config_file))
 168                 return config_file;
 169         free(config_file);
 170         return NULL;
 171 }
 172
 173 static void setup_signal_handling(void)
 174 {
 175         sig_task->fd = para_signal_init();
 176         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 177         para_install_sighandler(SIGINT);
 178         para_install_sighandler(SIGTERM);
 179         para_install_sighandler(SIGHUP);
 180         signal(SIGPIPE, SIG_IGN);
 181 }
 182
 183 static void clear_slot(int slot_num)
 184 {
 185         struct slot_info *s = &slot[slot_num];
 186
 187         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 188         memset(s, 0, sizeof(struct slot_info));
 189         s->format = -1;
 190 }
 191
 192 static void close_receiver(int slot_num)
 193 {
 194         struct slot_info *s = &slot[slot_num];
 195         struct audio_format_info *a;
 196
 197         if (s->format < 0 || !s->receiver_node)
 198                 return;
 199         a = &afi[s->format];
 200         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 201                 audio_formats[s->format], slot_num);
 202         a->receiver->close(s->receiver_node);
 203         free(s->receiver_node);
 204         s->receiver_node = NULL;
 205 }
 206
 207 static void kill_all_decoders(int error)
 208 {
 209         int i;
 210
 211         FOR_EACH_SLOT(i) {
 212                 struct slot_info *s = &slot[i];
 213                 if (s->wng && !s->wng->error) {
 214                         PARA_INFO_LOG("unregistering writer node group in slot %d\n",
 215                                 i);
 216                         wng_unregister(s->wng);
 217                         s->wng->error = error;
 218                 }
 219                 if (s->fc && !s->fc->error) {
 220                         PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
 221                         unregister_task(&s->fc->task);
 222                         s->fc->error = error;
 223                 }
 224                 if (s->receiver_node && !s->receiver_node->error) {
 225                         PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
 226                         unregister_task(&s->receiver_node->task);
 227                         s->receiver_node->error = error;
 228                 }
 229         }
 230 }
 231
 232 static int get_empty_slot(void)
 233 {
 234         int i;
 235         struct slot_info *s;
 236
 237         FOR_EACH_SLOT(i) {
 238                 s = &slot[i];
 239                 if (s->format < 0) {
 240                         clear_slot(i);
 241                         return i;
 242                 }
 243                 if (s->wng || s->receiver_node || s->fc)
 244                         continue;
 245                 clear_slot(i);
 246                 return i;
 247         }
 248         return -E_NO_MORE_SLOTS;
 249 }
 250
 251 /**
 252  * get the number of filters
 253  *
 254  * \param audio_format_num the number identifying the audio format
 255  *
 256  * \return the number of filters for the given audio format
 257  *
 258  * \sa struct filter;
 259  */
 260 int num_filters(int audio_format_num)
 261 {
 262         return afi[audio_format_num].num_filters;
 263 }
 264
 265 static void filter_event_handler(struct task *t)
 266 {
 267         PARA_NOTICE_LOG("%s\n", para_strerror(-t->ret));
 268         struct filter_chain *fc = t->private_data;
 269         fc->error = t->ret;
 270         unregister_task(t);
 271 }
 272
 273 static void open_filters(int slot_num)
 274 {
 275         struct slot_info *s = &slot[slot_num];
 276         struct audio_format_info *a = &afi[s->format];
 277         int nf = a->num_filters;
 278         int i;
 279
 280         s->fc = NULL;
 281         if (!nf)
 282                 return;
 283         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 284         s->fc = para_calloc(sizeof(struct filter_chain));
 285         INIT_LIST_HEAD(&s->fc->filters);
 286         s->fc->inbuf = s->receiver_node->buf;
 287         s->fc->in_loaded = &s->receiver_node->loaded;
 288         s->fc->input_error = &s->receiver_node->error;
 289         s->fc->task.pre_select = filter_pre_select;
 290         s->fc->task.event_handler = filter_event_handler;
 291         s->fc->task.private_data = s->fc;
 292         s->fc->error = 0;
 293
 294         s->receiver_node->output_error = &s->fc->error;
 295         sprintf(s->fc->task.status, "filter chain");
 296         for (i = 0; i < nf; i++) {
 297                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 298                 fn->conf = a->filter_conf[i];
 299                 fn->fc = s->fc;
 300                 fn->filter = a->filters[i];
 301                 INIT_LIST_HEAD(&fn->callbacks);
 302                 list_add_tail(&fn->node, &s->fc->filters);
 303                 fn->filter->open(fn);
 304                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 305                         audio_formats[s->format], i + 1,  nf,
 306                         fn->filter->name, slot_num);
 307                 s->fc->outbuf = fn->buf;
 308                 s->fc->out_loaded = &fn->loaded;
 309         }
 310         register_task(&s->fc->task);
 311 }
 312
 313 static void wng_event_handler(struct task *t)
 314 {
 315         struct writer_node_group *wng = t->private_data;
 316
 317         PARA_INFO_LOG("%s\n", para_strerror(-t->ret));
 318         wng->error = t->ret;
 319         wng_unregister(wng);
 320 }
 321
 322 static void open_writers(int slot_num)
 323 {
 324         int ret, i;
 325         struct slot_info *s = &slot[slot_num];
 326         struct audio_format_info *a = &afi[s->format];
 327
 328         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 329         if (!a->num_writers)
 330                 s->wng = setup_default_wng();
 331         else
 332                 s->wng = wng_new(a->num_writers);
 333         if (s->fc) {
 334                 s->wng->buf = s->fc->outbuf;
 335                 s->wng->loaded = s->fc->out_loaded;
 336                 s->wng->input_error = &s->fc->error;
 337                 s->wng->channels = &s->fc->channels;
 338                 s->wng->samplerate = &s->fc->samplerate;
 339                 s->fc->output_error = &s->wng->error;
 340                 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
 341         } else {
 342                 s->wng->buf = s->receiver_node->buf;
 343                 s->wng->loaded = &s->receiver_node->loaded;
 344                 s->wng->input_error = &s->receiver_node->error;
 345         }
 346         s->wng->task.event_handler = wng_event_handler;
 347         for (i = 0; i < a->num_writers; i++) {
 348                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 349                 s->wng->writer_nodes[i].writer = a->writers[i];
 350         }
 351         ret = wng_open(s->wng);
 352         if (ret < 0) {
 353                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 354                 return;
 355         }
 356         s->wstime = *now;
 357         activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
 358 }
 359
 360 static void rn_event_handler(struct task *t)
 361 {
 362         struct receiver_node *rn = t->private_data;
 363         int i;
 364
 365         PARA_NOTICE_LOG("%s\n", para_strerror(-t->ret));
 366         unregister_task(t);
 367         rn->error = t->ret;
 368         /* set restart barrier */
 369         FOR_EACH_SLOT(i) {
 370                 struct timeval restart_delay = {0, 10 * 1000};
 371                 if (slot[i].receiver_node != rn)
 372                         continue;
 373                 if (rn->error != -E_RECV_EOF)
 374                         /* don't reconnect immediately on errors */
 375                         restart_delay.tv_sec = 5;
 376                 tv_add(now, &restart_delay, &afi[slot[i].format].restart_barrier);
 377         }
 378 }
 379
 380 static int open_receiver(int format)
 381 {
 382         struct audio_format_info *a = &afi[format];
 383         struct slot_info *s;
 384         int ret, slot_num;
 385         struct receiver_node *rn;
 386         const struct timeval restart_delay = {1, 0};
 387
 388         ret = get_empty_slot();
 389         if (ret < 0)
 390                 goto err;
 391         slot_num = ret;
 392         s = &slot[slot_num];
 393         s->format = format;
 394         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 395         rn = s->receiver_node;
 396         rn->receiver = a->receiver;
 397         rn->conf = a->receiver_conf;
 398         ret = a->receiver->open(s->receiver_node);
 399         if (ret < 0) {
 400                 free(s->receiver_node);
 401                 s->receiver_node = NULL;
 402                 goto err;
 403         }
 404         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 405                 audio_formats[s->format], a->receiver->name, slot_num);
 406         rn->task.private_data = s->receiver_node;
 407         rn->task.pre_select = a->receiver->pre_select;
 408         rn->task.post_select = a->receiver->post_select;
 409         rn->task.event_handler = rn_event_handler;
 410         sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
 411         register_task(&rn->task);
 412         return 1;
 413 err:
 414         PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 415         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 416         return ret;
 417 }
 418
 419 static int receiver_running(int format)
 420 {
 421         int i;
 422
 423         FOR_EACH_SLOT(i) {
 424                 struct slot_info *s = &slot[i];
 425                 if (s->format == format && s->receiver_node
 426                                 && !s->receiver_node->error)
 427                         return 1;
 428         }
 429         return 0;
 430 }
 431
 432 static int open_current_receiver(struct sched *s)
 433 {
 434         int i;
 435         struct timeval diff;
 436         char *audio_format = stat_task->stat_item_values[SI_FORMAT];
 437
 438         if (!audio_format || !stat_task->pcd)
 439                 return 0;
 440         i = get_audio_format_num(audio_format + strlen(
 441                 status_item_list[SI_FORMAT]) + 1);
 442         if (i < 0)
 443                 return 0;
 444         if (receiver_running(i))
 445                 return 0;
 446         if (tv_diff(now, &afi[i].restart_barrier, &diff) < 0) {
 447                 s->timeout = diff;
 448                 return 0;
 449         }
 450         return open_receiver(i) < 0? 0 : 1;
 451 }
 452
 453 static unsigned compute_time_diff(const struct timeval *status_time)
 454 {
 455         struct timeval tmp, diff;
 456         static unsigned count;
 457         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 458         const struct timeval max_deviation = {0, 500 * 1000};
 459         const int time_smooth = 5;
 460
 461         if (!status_time)
 462                 return count;
 463         sign = tv_diff(status_time, now, &diff);
 464 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 465 //                      sign, sa_time_diff_sign);
 466         if (!count) {
 467                 sa_time_diff_sign = sign;
 468                 stat_task->sa_time_diff = diff;
 469                 count++;
 470                 goto out;
 471         }
 472         if (count > 5) {
 473                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 474                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 475                         PARA_WARNING_LOG("time diff jump: %lims\n",
 476                                 s * tv2ms(&tmp));
 477         }
 478         count++;
 479         sa_time_diff_sign = tv_convex_combination(
 480                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 481                 count > 10? sign : sign * time_smooth, &diff,
 482                 &tmp);
 483         stat_task->sa_time_diff = tmp;
 484         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 485                 sign > 0? "+" : "-",
 486                 tv2ms(&diff),
 487                 sa_time_diff_sign ? "+" : "-",
 488                 tv2ms(&stat_task->sa_time_diff)
 489         );
 490 out:
 491         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 492         return count;
 493 }
 494
 495 static int check_stat_line(char *line, __a_unused void *data)
 496 {
 497         int itemnum;
 498         size_t ilen = 0;
 499         long unsigned sec, usec;
 500         char *tmp;
 501
 502 //      PARA_INFO_LOG("line: %s\n", line);
 503         if (!line)
 504                 return 1;
 505         itemnum = stat_line_valid(line);
 506         if (itemnum < 0) {
 507                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 508                 return 1;
 509         }
 510         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 511                 return 1;
 512         tmp = make_message("%s\n", line);
 513         stat_client_write(tmp, itemnum);
 514         free(tmp);
 515         free(stat_task->stat_item_values[itemnum]);
 516         stat_task->stat_item_values[itemnum] = para_strdup(line);
 517         ilen = strlen(status_item_list[itemnum]);
 518         switch (itemnum) {
 519         case SI_STATUS:
 520                 stat_task->playing = strstr(line, "playing")? 1 : 0;
 521                 break;
 522         case SI_OFFSET:
 523                 stat_task->offset_seconds = atoi(line + ilen + 1);
 524                 break;
 525         case SI_SECONDS_TOTAL:
 526                 stat_task->length_seconds = atoi(line + ilen + 1);
 527                 break;
 528         case SI_STREAM_START:
 529                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 530                         struct timeval a_start, delay;
 531                         delay.tv_sec = conf.stream_delay_arg / 1000;
 532                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 533                         stat_task->server_stream_start.tv_sec = sec;
 534                         stat_task->server_stream_start.tv_usec = usec;
 535                         if (compute_time_diff(NULL) > 2) {
 536                                 if (stat_task->sa_time_diff_sign < 0)
 537                                         tv_add(&stat_task->server_stream_start,
 538                                                 &stat_task->sa_time_diff, &a_start);
 539                                 else
 540                                         tv_diff(&stat_task->server_stream_start,
 541                                                 &stat_task->sa_time_diff, &a_start);
 542                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 543                         }
 544                 }
 545                 break;
 546         case SI_CURRENT_TIME:
 547                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 548                         struct timeval tv = {sec, usec};
 549                         compute_time_diff(&tv);
 550                 }
 551                 if (stat_task->clock_diff_count)
 552                         stat_task->clock_diff_count--;
 553                 break;
 554         }
 555         return 1;
 556 }
 557
 558 static void try_to_close_slot(int slot_num)
 559 {
 560         struct slot_info *s = &slot[slot_num];
 561
 562         if (s->format < 0)
 563                 return;
 564         if (s->receiver_node && !s->receiver_node->error)
 565                 return;
 566         if (s->fc && !s->fc->error)
 567                 return;
 568         if (s->wng && !s->wng->error)
 569                 return;
 570         PARA_INFO_LOG("closing slot %d\n", slot_num);
 571         wng_close(s->wng);
 572         close_filters(s->fc);
 573         free(s->fc);
 574         close_receiver(slot_num);
 575         clear_slot(slot_num);
 576 }
 577
 578 /*
 579  * Check if any receivers/filters/writers need to be started and do so if
 580  * necessary.  Since the pre_select function didn't have a chance yet to put
 581  * file descriptors into the fd sets given by s, make the upcoming select()
 582  * return immediately to avoid a long timeout in case we started something.
 583  */
 584 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
 585 {
 586         int i;
 587         struct timeval min_delay = {0, 1};
 588
 589         t->ret = 1;
 590         if (audiod_status != AUDIOD_ON || !stat_task->playing)
 591                 return kill_all_decoders(-E_NOT_PLAYING);
 592         if (open_current_receiver(s))
 593                 s->timeout = min_delay;
 594         FOR_EACH_SLOT(i) {
 595                 struct slot_info *sl = &slot[i];
 596                 struct audio_format_info *a;
 597                 struct timeval diff;
 598
 599                 if (sl->format < 0)
 600                         continue;
 601                 a = &afi[sl->format];
 602                 if (!sl->receiver_node)
 603                         continue;
 604                 if (!a->num_filters) {
 605                         if (sl->receiver_node->loaded && !sl->wng) {
 606                                 open_writers(i);
 607                                 s->timeout = min_delay;
 608                         }
 609                         continue;
 610                 }
 611                 if (sl->receiver_node->loaded && !sl->fc) {
 612                         open_filters(i);
 613                         s->timeout = min_delay;
 614                         continue;
 615                 }
 616                 if (!sl->fc || !*sl->fc->out_loaded || sl->wng)
 617                         continue;
 618                 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
 619                         open_writers(i);
 620                         s->timeout = min_delay;
 621                         continue;
 622                 }
 623                 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
 624                 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
 625                         s->timeout = diff;
 626                 }
 627         }
 628 }
 629
 630 static void audiod_post_select(__a_unused struct sched *s,
 631         __a_unused struct task *t)
 632 {
 633         int i;
 634
 635         t->ret = 1;
 636         FOR_EACH_SLOT(i)
 637                 try_to_close_slot(i);
 638 }
 639
 640 static void init_audiod_task(struct task *t)
 641 {
 642         t->pre_select = audiod_pre_select;
 643         t->post_select = audiod_post_select;
 644         t->event_handler = NULL;
 645         t->private_data = t;
 646         sprintf(t->status, "audiod task");
 647 }
 648
 649 static int parse_stream_command(const char *txt, char **cmd)
 650 {
 651         char *p = strchr(txt, ':');
 652         int i;
 653
 654         if (!p)
 655                 return -E_MISSING_COLON;
 656         p++;
 657         FOR_EACH_AUDIO_FORMAT(i) {
 658                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 659                         continue;
 660                 *cmd = p;
 661                 return i;
 662         }
 663         return -E_UNSUPPORTED_AUDIO_FORMAT;
 664 }
 665
 666 static int add_filter(int format, char *cmdline)
 667 {
 668         struct audio_format_info *a = &afi[format];
 669         int filter_num, nf = a->num_filters;
 670
 671         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 672         if (filter_num < 0)
 673                 return filter_num;
 674         a->filters[nf] = &filters[filter_num];
 675         a->num_filters++;
 676         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
 677                 a->filters[nf]->name);
 678         return filter_num;
 679 }
 680
 681 static int init_writers(void)
 682 {
 683         int i, ret, nw;
 684         char *cmd;
 685         struct audio_format_info *a;
 686
 687         init_supported_writers();
 688         nw = PARA_MAX(1, conf.writer_given);
 689         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 690         FOR_EACH_AUDIO_FORMAT(i) {
 691                 a = &afi[i];
 692                 a->writer_conf = para_malloc(nw * sizeof(void *));
 693                 a->writers = para_malloc(nw * sizeof(struct writer *));
 694                 a->num_writers = 0;
 695         }
 696         for (i = 0; i < conf.writer_given; i++) {
 697                 void *wconf;
 698                 int writer_num;
 699                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 700                 if (ret < 0)
 701                         goto out;
 702                 a = &afi[ret];
 703                 nw = a->num_writers;
 704                 wconf = check_writer_arg(cmd, &writer_num);
 705                 if (!wconf) {
 706                         ret = writer_num;
 707                         goto out;
 708                 }
 709                 a->writers[nw] = &writers[writer_num];
 710                 a->writer_conf[nw] = wconf;
 711                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 712                         nw, writer_names[writer_num]);
 713                 a->num_writers++;
 714         }
 715         ret = 1;
 716 out:
 717         return ret;
 718 }
 719
 720 static int init_receivers(void)
 721 {
 722         int i, ret, receiver_num;
 723         char *cmd = NULL;
 724         struct audio_format_info *a;
 725
 726         for (i = 0; receivers[i].name; i++) {
 727                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
 728                 receivers[i].init(&receivers[i]);
 729         }
 730         for (i = conf.receiver_given - 1; i >= 0; i--) {
 731                 char *arg = conf.receiver_arg[i];
 732                 char *recv_arg = strchr(arg, ':');
 733                 ret = -E_MISSING_COLON;
 734                 if (!recv_arg)
 735                         goto out;
 736                 *recv_arg = '\0';
 737                 recv_arg++;
 738                 ret = get_audio_format_num(arg);
 739                 if (ret < 0)
 740                         goto out;
 741                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 742                 if (!afi[ret].receiver_conf) {
 743                         ret = -E_RECV_SYNTAX;
 744                         goto out;
 745                 }
 746                 afi[ret].receiver = &receivers[receiver_num];
 747         }
 748         /* use the first available receiver with no arguments
 749          * for those audio formats for which no receiver
 750          * was specified
 751          */
 752         cmd = para_strdup(receivers[0].name);
 753         FOR_EACH_AUDIO_FORMAT(i) {
 754                 a = &afi[i];
 755                 if (a->receiver_conf)
 756                         continue;
 757                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 758                 if (!a->receiver_conf)
 759                         return -E_RECV_SYNTAX;
 760                 a->receiver = &receivers[receiver_num];
 761         }
 762         ret = 1;
 763 out:
 764         free(cmd);
 765         return ret;
 766 }
 767
 768 static int init_default_filters(void)
 769 {
 770         int i, ret = 1;
 771
 772         FOR_EACH_AUDIO_FORMAT(i) {
 773                 struct audio_format_info *a = &afi[i];
 774                 char *tmp;
 775                 int j;
 776
 777                 if (a->num_filters)
 778                         continue; /* no default -- nothing to to */
 779                 /* add "dec" to audio format name */
 780                 tmp = make_message("%sdec", audio_formats[i]);
 781                 for (j = 0; filters[j].name; j++)
 782                         if (!strcmp(tmp, filters[j].name))
 783                                 break;
 784                 free(tmp);
 785                 ret = -E_UNSUPPORTED_FILTER;
 786                 if (!filters[j].name)
 787                         goto out;
 788                 tmp = para_strdup(filters[j].name);
 789                 ret = add_filter(i, tmp);
 790                 free(tmp);
 791                 if (ret < 0)
 792                         goto out;
 793                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 794                         filters[j].name);
 795         }
 796 out:
 797         return ret;
 798 }
 799
 800 static int init_filters(void)
 801 {
 802         int i, ret, nf;
 803
 804         filter_init(filters);
 805         nf = PARA_MAX(1,  conf.filter_given);
 806         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 807         FOR_EACH_AUDIO_FORMAT(i) {
 808                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 809                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
 810         }
 811         if (!conf.no_default_filters_given)
 812                 return init_default_filters();
 813         for (i = 0; i < conf.filter_given; i++) {
 814                 char *arg = conf.filter_arg[i];
 815                 char *filter_name = strchr(arg, ':');
 816                 ret = -E_MISSING_COLON;
 817                 if (!filter_name)
 818                         goto out;
 819                 *filter_name = '\0';
 820                 filter_name++;
 821                 ret = get_audio_format_num(arg);
 822                 if (ret < 0)
 823                         goto out;
 824                 ret = add_filter(ret, filter_name);
 825                 if (ret < 0)
 826                         goto out;
 827         }
 828         ret = init_default_filters(); /* use default values for the rest */
 829 out:
 830         return ret;
 831 }
 832
 833 static int init_stream_io(void)
 834 {
 835         int ret;
 836
 837         ret = init_writers();
 838         if (ret < 0)
 839                 return ret;
 840         ret = init_receivers();
 841         if (ret < 0)
 842                 return ret;
 843         ret = init_filters();
 844         if (ret < 0)
 845                 return ret;
 846         return 1;
 847 }
 848
 849 /* does not unlink socket on errors */
 850 static int audiod_get_socket(void)
 851 {
 852         struct sockaddr_un unix_addr;
 853         int ret, fd;
 854
 855         if (conf.socket_given)
 856                 socket_name = para_strdup(conf.socket_arg);
 857         else {
 858                 char *hn = para_hostname();
 859                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 860                         hn);
 861                 free(hn);
 862         }
 863         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 864         if (conf.force_given)
 865                 unlink(socket_name);
 866         ret = create_local_socket(socket_name, &unix_addr,
 867                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 868         if (ret < 0)
 869                 goto err;
 870         fd = ret;
 871         if (listen(fd , 5) < 0) {
 872                 ret = -ERRNO_TO_PARA_ERROR(errno);
 873                 goto err;
 874         }
 875         ret = mark_fd_nonblocking(fd);
 876         if (ret < 0)
 877                 goto err;
 878         return fd;
 879 err:
 880         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 881         exit(EXIT_FAILURE);
 882 }
 883
 884 static void signal_event_handler(struct task *t)
 885 {
 886         struct signal_task *st = t->private_data;
 887
 888         switch (st->signum) {
 889         case SIGINT:
 890         case SIGTERM:
 891         case SIGHUP:
 892                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 893                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 894         }
 895 }
 896
 897 static void signal_pre_select(struct sched *s, struct task *t)
 898 {
 899         struct signal_task *st = t->private_data;
 900         t->ret = 1;
 901         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 902 }
 903
 904 static void signal_post_select(struct sched *s, struct task *t)
 905 {
 906         struct signal_task *st = t->private_data;
 907         t->ret = 1;
 908         if (!FD_ISSET(st->fd, &s->rfds))
 909                 return;
 910         t->ret = -E_SIGNAL_CAUGHT;
 911         st->signum = para_next_signal();
 912 }
 913
 914 static void signal_setup_default(struct signal_task *st)
 915 {
 916         st->task.pre_select = signal_pre_select;
 917         st->task.post_select = signal_post_select;
 918         st->task.private_data = st;
 919         sprintf(st->task.status, "signal task");
 920 }
 921
 922 static void command_pre_select(struct sched *s, struct task *t)
 923 {
 924         struct command_task *ct = t->private_data;
 925         t->ret = 1;
 926         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 927
 928 }
 929
 930 static void command_post_select(struct sched *s, struct task *t)
 931 {
 932         int ret;
 933         struct command_task *ct = t->private_data;
 934
 935         t->ret = 1; /* always successful */
 936         audiod_status_dump();
 937         if (!FD_ISSET(ct->fd, &s->rfds))
 938                 return;
 939         ret = handle_connect(ct->fd);
 940         if (ret < 0)
 941                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 942 }
 943
 944 static void init_command_task(struct command_task *ct)
 945 {
 946         ct->task.pre_select = command_pre_select;
 947         ct->task.post_select = command_post_select;
 948         ct->task.event_handler = NULL;
 949         ct->task.private_data = ct;
 950         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 951         sprintf(ct->task.status, "command task");
 952 }
 953
 954 static void close_stat_pipe(void)
 955 {
 956         int i;
 957
 958         if (!stat_task->pcd)
 959                 return;
 960         client_close(stat_task->pcd);
 961         stat_task->pcd = NULL;
 962         FOR_EACH_STATUS_ITEM(i) {
 963                 free(stat_task->stat_item_values[i]);
 964                 stat_task->stat_item_values[i] = NULL;
 965         }
 966         dump_empty_status();
 967         stat_task->length_seconds = 0;
 968         stat_task->offset_seconds = 0;
 969         audiod_status_dump();
 970         stat_task->playing = 0;
 971         stat_task->stat_item_values[SI_BASENAME] = make_message(
 972                 "%s: no connection to para_server\n",
 973                 status_item_list[SI_BASENAME]);
 974         stat_client_write(stat_task->stat_item_values[SI_BASENAME],
 975                 SI_BASENAME);
 976         if (stat_task->clock_diff_count) {
 977                 stat_task->clock_diff_barrier.tv_sec = now->tv_sec + 1;
 978                 stat_task->clock_diff_barrier.tv_usec = now->tv_usec;
 979         }
 980 }
 981
 982 /**
 983  * close the connection to para_server and exit
 984  *
 985  * \param status the exit status which is passed to exit(3)
 986  * \param msg the log message
 987  *
 988  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
 989  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
 990  * EXIT_FAILURE.
 991  *
 992  * \sa exit(3)
 993  */
 994 void __noreturn clean_exit(int status, const char *msg)
 995 {
 996         PARA_EMERG_LOG("%s\n", msg);
 997         if (socket_name)
 998                 unlink(socket_name);
 999         close_stat_pipe();
1000         exit(status);
1001 }
1002
1003 /* avoid busy loop if server is down */
1004 static void set_stat_task_restart_barrier(void)
1005 {
1006         struct timeval delay = {5, 0};
1007         tv_add(now, &delay, &stat_task->restart_barrier);
1008 }
1009
1010 static void client_task_event_handler(__a_unused struct task *t)
1011 {
1012         int i;
1013
1014         if (t->ret == -E_HANDSHAKE_COMPLETE)
1015                 return;
1016         unregister_task(t);
1017         close_stat_pipe();
1018         if (t->ret != -E_SERVER_EOF)
1019                 stat_task->clock_diff_count = conf.clock_diff_count_arg;
1020         set_stat_task_restart_barrier();
1021         FOR_EACH_AUDIO_FORMAT(i)
1022                 afi[i].restart_barrier = stat_task->restart_barrier;
1023 }
1024
1025 static void status_pre_select(struct sched *s, struct task *t)
1026 {
1027         struct status_task *st = t->private_data;
1028         int ret;
1029
1030         t->ret = 1; /* always successful */
1031         if (st->pcd || audiod_status == AUDIOD_OFF)
1032                 return;
1033         if (!st->clock_diff_count && tv_diff(now, &st->restart_barrier, NULL)
1034                         < 0)
1035                 return;
1036         if (st->clock_diff_count) {
1037                 char *argv[] = {"audiod", "stat", "1", NULL};
1038                 int argc = 3;
1039                 if (tv_diff(now, &st->clock_diff_barrier, NULL) < 0)
1040                         return;
1041                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1042                 ret = client_open(argc, argv, &st->pcd);
1043
1044         } else {
1045                 char *argv[] = {"audiod", "stat", NULL};
1046                 int argc = 2;
1047                 ret = client_open(argc, argv, &st->pcd);
1048         }
1049         set_stat_task_restart_barrier();
1050         if (ret < 0)
1051                 return;
1052         st->pcd->task.event_handler = client_task_event_handler;
1053         s->timeout.tv_sec = 0;
1054         s->timeout.tv_usec = 1;
1055 }
1056
1057 static void status_post_select(__a_unused struct sched *s, struct task *t)
1058 {
1059         struct status_task *st = t->private_data;
1060         unsigned bytes_left;
1061
1062         t->ret = 1;
1063         if (!st->pcd || st->pcd->status != CL_RECEIVING)
1064                 return;
1065         if (st->pcd && audiod_status == AUDIOD_OFF) {
1066                 unregister_task(&st->pcd->task);
1067                 close_stat_pipe();
1068                 st->clock_diff_count = conf.clock_diff_count_arg;
1069                 return;
1070         }
1071         bytes_left = for_each_line(st->pcd->buf, st->pcd->loaded,
1072                 &check_stat_line, NULL);
1073         if (st->pcd->loaded != bytes_left) {
1074                 st->last_status_read = *now;
1075                 st->pcd->loaded = bytes_left;
1076         } else {
1077                 struct timeval diff;
1078                 tv_diff(now, &st->last_status_read, &diff);
1079                 if (diff.tv_sec > 61)
1080                         close_stat_pipe();
1081         }
1082 }
1083
1084 static void init_status_task(struct status_task *st)
1085 {
1086         memset(st, 0, sizeof(struct status_task));
1087         st->task.pre_select = status_pre_select;
1088         st->task.post_select = status_post_select;
1089         st->task.private_data = st;
1090         st->sa_time_diff_sign = 1;
1091         st->clock_diff_count = conf.clock_diff_count_arg;
1092         sprintf(st->task.status, "status task");
1093 }
1094
1095 static void set_initial_status(void)
1096 {
1097         audiod_status = AUDIOD_ON;
1098         if (!conf.mode_given)
1099                 return;
1100         if (!strcmp(conf.mode_arg, "sb")) {
1101                 audiod_status = AUDIOD_STANDBY;
1102                 return;
1103         }
1104         if (!strcmp(conf.mode_arg, "off")) {
1105                 audiod_status = AUDIOD_OFF;
1106                 return;
1107         }
1108         if (strcmp(conf.mode_arg, "on"))
1109                 PARA_WARNING_LOG("%s", "invalid mode\n");
1110 }
1111
1112 /**
1113  * the main function of para_audiod
1114  *
1115  * \param argc usual argument count
1116  * \param argv usual argument vector
1117  *
1118  * \return EXIT_SUCCESS or EXIT_FAILURE
1119  *
1120  * \sa para_audiod(1)
1121  * */
1122 int main(int argc, char *argv[])
1123 {
1124         char *config_file;
1125         int ret, i;
1126         struct sched s;
1127         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1128         struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1129
1130         valid_fd_012();
1131         audiod_cmdline_parser(argc, argv, &conf);
1132         HANDLE_VERSION_FLAG("audiod", conf);
1133         para_drop_privileges(conf.user_arg, conf.group_arg);
1134         config_file = configfile_exists();
1135         if (config_file) {
1136                 struct audiod_cmdline_parser_params params = {
1137                         .override = 0,
1138                         .initialize = 0,
1139                         .check_required = 0,
1140                         .check_ambiguity = 0
1141
1142                 };
1143                 if (audiod_cmdline_parser_config_file(config_file, &conf, &params)) {
1144                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1145                         exit(EXIT_FAILURE);
1146                 }
1147                 free(config_file);
1148         }
1149         if (conf.logfile_given)
1150                 logfile = open_log(conf.logfile_arg);
1151         log_welcome("para_audiod", conf.loglevel_arg);
1152         i = init_stream_io();
1153         if (i < 0) {
1154                 PARA_EMERG_LOG("init stream io error: %s\n", para_strerror(-i));
1155                 exit(EXIT_FAILURE);
1156         }
1157         server_uptime(UPTIME_SET);
1158         set_initial_status();
1159         FOR_EACH_SLOT(i)
1160                 clear_slot(i);
1161         init_grabbing();
1162         setup_signal_handling();
1163         signal_setup_default(sig_task);
1164         sig_task->task.event_handler = signal_event_handler;
1165
1166         init_status_task(stat_task);
1167         init_command_task(cmd_task);
1168         init_audiod_task(audiod_task);
1169
1170         if (conf.daemon_given)
1171                 daemon_init();
1172
1173         register_task(&sig_task->task);
1174         register_task(&cmd_task->task);
1175         register_task(&stat_task->task);
1176         register_task(audiod_task);
1177         s.default_timeout.tv_sec = 0;
1178         s.default_timeout.tv_usec = 99 * 1000;
1179         ret = schedule(&s);
1180
1181         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1182         return EXIT_FAILURE;
1183 }