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 (!logfile && conf.daemon_given)
 148                 return;
 149         if (!hostname)
 150                 hostname = para_hostname();
 151         outfd = logfile? logfile : stderr;
 152         time(&t1);
 153         tm = localtime(&t1);
 154         strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
 155         fprintf(outfd, "%s %s ", str, hostname);
 156         if (conf.loglevel_arg <= INFO)
 157                 fprintf(outfd, "%i ", ll);
 158         va_start(argp, fmt);
 159         vfprintf(outfd, fmt, argp);
 160         va_end(argp);
 161 }
 162
 163 static char *configfile_exists(void)
 164 {
 165         char *home = para_homedir();
 166         char *config_file = make_message("%s/.paraslash/audiod.conf",
 167                 home);
 168         free(home);
 169         if (file_exists(config_file))
 170                 return config_file;
 171         free(config_file);
 172         return NULL;
 173 }
 174
 175 static void setup_signal_handling(void)
 176 {
 177         sig_task->fd = para_signal_init();
 178         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 179         para_install_sighandler(SIGINT);
 180         para_install_sighandler(SIGTERM);
 181         para_install_sighandler(SIGHUP);
 182         signal(SIGPIPE, SIG_IGN);
 183 }
 184
 185 static void clear_slot(int slot_num)
 186 {
 187         struct slot_info *s = &slot[slot_num];
 188
 189         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 190         memset(s, 0, sizeof(struct slot_info));
 191         s->format = -1;
 192 }
 193
 194 static void close_receiver(int slot_num)
 195 {
 196         struct slot_info *s = &slot[slot_num];
 197         struct audio_format_info *a;
 198
 199         if (s->format < 0 || !s->receiver_node)
 200                 return;
 201         a = &afi[s->format];
 202         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 203                 audio_formats[s->format], slot_num);
 204         a->receiver->close(s->receiver_node);
 205         free(s->receiver_node);
 206         s->receiver_node = NULL;
 207 }
 208
 209 static void kill_all_decoders(int error)
 210 {
 211         int i;
 212
 213         FOR_EACH_SLOT(i) {
 214                 struct slot_info *s = &slot[i];
 215                 if (s->wng && !s->wng->error) {
 216                         PARA_INFO_LOG("unregistering writer node group in slot %d\n",
 217                                 i);
 218                         wng_unregister(s->wng);
 219                         s->wng->error = error;
 220                 }
 221                 if (s->fc && !s->fc->error) {
 222                         PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
 223                         unregister_task(&s->fc->task);
 224                         s->fc->error = error;
 225                 }
 226                 if (s->receiver_node && !s->receiver_node->error) {
 227                         PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
 228                         unregister_task(&s->receiver_node->task);
 229                         s->receiver_node->error = error;
 230                 }
 231         }
 232 }
 233
 234 static int get_empty_slot(void)
 235 {
 236         int i;
 237         struct slot_info *s;
 238
 239         FOR_EACH_SLOT(i) {
 240                 s = &slot[i];
 241                 if (s->format < 0) {
 242                         clear_slot(i);
 243                         return i;
 244                 }
 245                 if (s->wng || s->receiver_node || s->fc)
 246                         continue;
 247                 clear_slot(i);
 248                 return i;
 249         }
 250         return -E_NO_MORE_SLOTS;
 251 }
 252
 253 /**
 254  * get the number of filters
 255  *
 256  * \param audio_format_num the number identifying the audio format
 257  *
 258  * \return the number of filters for the given audio format
 259  *
 260  * \sa struct filter;
 261  */
 262 int num_filters(int audio_format_num)
 263 {
 264         return afi[audio_format_num].num_filters;
 265 }
 266
 267 static void filter_event_handler(struct task *t)
 268 {
 269         PARA_NOTICE_LOG("%s\n", para_strerror(-t->ret));
 270         struct filter_chain *fc = t->private_data;
 271         fc->error = t->ret;
 272         unregister_task(t);
 273 }
 274
 275 static void open_filters(int slot_num)
 276 {
 277         struct slot_info *s = &slot[slot_num];
 278         struct audio_format_info *a = &afi[s->format];
 279         int nf = a->num_filters;
 280         int i;
 281
 282         s->fc = NULL;
 283         if (!nf)
 284                 return;
 285         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 286         s->fc = para_calloc(sizeof(struct filter_chain));
 287         INIT_LIST_HEAD(&s->fc->filters);
 288         s->fc->inbuf = s->receiver_node->buf;
 289         s->fc->in_loaded = &s->receiver_node->loaded;
 290         s->fc->input_error = &s->receiver_node->error;
 291         s->fc->task.pre_select = filter_pre_select;
 292         s->fc->task.event_handler = filter_event_handler;
 293         s->fc->task.private_data = s->fc;
 294         s->fc->error = 0;
 295
 296         s->receiver_node->output_error = &s->fc->error;
 297         sprintf(s->fc->task.status, "filter chain");
 298         for (i = 0; i < nf; i++) {
 299                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 300                 fn->conf = a->filter_conf[i];
 301                 fn->fc = s->fc;
 302                 fn->filter = a->filters[i];
 303                 INIT_LIST_HEAD(&fn->callbacks);
 304                 list_add_tail(&fn->node, &s->fc->filters);
 305                 fn->filter->open(fn);
 306                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 307                         audio_formats[s->format], i + 1,  nf,
 308                         fn->filter->name, slot_num);
 309                 s->fc->outbuf = fn->buf;
 310                 s->fc->out_loaded = &fn->loaded;
 311         }
 312         register_task(&s->fc->task);
 313 }
 314
 315 static void wng_event_handler(struct task *t)
 316 {
 317         struct writer_node_group *wng = t->private_data;
 318
 319         PARA_INFO_LOG("%s\n", para_strerror(-t->ret));
 320         wng->error = t->ret;
 321         wng_unregister(wng);
 322 }
 323
 324 static void open_writers(int slot_num)
 325 {
 326         int ret, i;
 327         struct slot_info *s = &slot[slot_num];
 328         struct audio_format_info *a = &afi[s->format];
 329
 330         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 331         if (!a->num_writers)
 332                 s->wng = setup_default_wng();
 333         else
 334                 s->wng = wng_new(a->num_writers);
 335         if (s->fc) {
 336                 s->wng->buf = s->fc->outbuf;
 337                 s->wng->loaded = s->fc->out_loaded;
 338                 s->wng->input_error = &s->fc->error;
 339                 s->wng->channels = &s->fc->channels;
 340                 s->wng->samplerate = &s->fc->samplerate;
 341                 s->fc->output_error = &s->wng->error;
 342                 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
 343         } else {
 344                 s->wng->buf = s->receiver_node->buf;
 345                 s->wng->loaded = &s->receiver_node->loaded;
 346                 s->wng->input_error = &s->receiver_node->error;
 347         }
 348         s->wng->task.event_handler = wng_event_handler;
 349         for (i = 0; i < a->num_writers; i++) {
 350                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 351                 s->wng->writer_nodes[i].writer = a->writers[i];
 352         }
 353         ret = wng_open(s->wng);
 354         if (ret < 0) {
 355                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 356                 return;
 357         }
 358         s->wstime = *now;
 359         activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
 360 }
 361
 362 static void rn_event_handler(struct task *t)
 363 {
 364         struct receiver_node *rn = t->private_data;
 365         int i;
 366
 367         PARA_NOTICE_LOG("%s\n", para_strerror(-t->ret));
 368         unregister_task(t);
 369         rn->error = t->ret;
 370         /* set restart barrier */
 371         FOR_EACH_SLOT(i) {
 372                 struct timeval restart_delay = {0, 10 * 1000};
 373                 if (slot[i].receiver_node != rn)
 374                         continue;
 375                 if (rn->error != -E_RECV_EOF)
 376                         /* don't reconnect immediately on errors */
 377                         restart_delay.tv_sec = 5;
 378                 tv_add(now, &restart_delay, &afi[slot[i].format].restart_barrier);
 379         }
 380 }
 381
 382 static int open_receiver(int format)
 383 {
 384         struct audio_format_info *a = &afi[format];
 385         struct slot_info *s;
 386         int ret, slot_num;
 387         struct receiver_node *rn;
 388         const struct timeval restart_delay = {1, 0};
 389
 390         ret = get_empty_slot();
 391         if (ret < 0)
 392                 goto err;
 393         slot_num = ret;
 394         s = &slot[slot_num];
 395         s->format = format;
 396         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 397         rn = s->receiver_node;
 398         rn->receiver = a->receiver;
 399         rn->conf = a->receiver_conf;
 400         ret = a->receiver->open(s->receiver_node);
 401         if (ret < 0) {
 402                 free(s->receiver_node);
 403                 s->receiver_node = NULL;
 404                 goto err;
 405         }
 406         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 407                 audio_formats[s->format], a->receiver->name, slot_num);
 408         rn->task.private_data = s->receiver_node;
 409         rn->task.pre_select = a->receiver->pre_select;
 410         rn->task.post_select = a->receiver->post_select;
 411         rn->task.event_handler = rn_event_handler;
 412         sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
 413         register_task(&rn->task);
 414         return 1;
 415 err:
 416         PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 417         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 418         return ret;
 419 }
 420
 421 static int receiver_running(int format)
 422 {
 423         int i;
 424
 425         FOR_EACH_SLOT(i) {
 426                 struct slot_info *s = &slot[i];
 427                 if (s->format == format && s->receiver_node
 428                                 && !s->receiver_node->error)
 429                         return 1;
 430         }
 431         return 0;
 432 }
 433
 434 static int open_current_receiver(struct sched *s)
 435 {
 436         struct timeval diff;
 437         int cafn = stat_task->current_audio_format_num;
 438
 439         if (cafn < 0 || !stat_task->pcd)
 440                 return 0;
 441         if (receiver_running(cafn))
 442                 return 0;
 443         if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
 444                 s->timeout = diff;
 445                 return 0;
 446         }
 447         return open_receiver(cafn) < 0? 0 : 1;
 448 }
 449
 450 static unsigned compute_time_diff(const struct timeval *status_time)
 451 {
 452         struct timeval tmp, diff;
 453         static unsigned count;
 454         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 455         const struct timeval max_deviation = {0, 500 * 1000};
 456         const int time_smooth = 5;
 457
 458         if (!status_time)
 459                 return count;
 460         sign = tv_diff(status_time, now, &diff);
 461 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 462 //                      sign, sa_time_diff_sign);
 463         if (!count) {
 464                 sa_time_diff_sign = sign;
 465                 stat_task->sa_time_diff = diff;
 466                 count++;
 467                 goto out;
 468         }
 469         if (count > 5) {
 470                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 471                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 472                         PARA_WARNING_LOG("time diff jump: %lims\n",
 473                                 s * tv2ms(&tmp));
 474         }
 475         count++;
 476         sa_time_diff_sign = tv_convex_combination(
 477                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 478                 count > 10? sign : sign * time_smooth, &diff,
 479                 &tmp);
 480         stat_task->sa_time_diff = tmp;
 481         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 482                 sign > 0? "+" : "-",
 483                 tv2ms(&diff),
 484                 sa_time_diff_sign ? "+" : "-",
 485                 tv2ms(&stat_task->sa_time_diff)
 486         );
 487 out:
 488         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 489         return count;
 490 }
 491
 492 static int check_stat_line(char *line, __a_unused void *data)
 493 {
 494         int itemnum;
 495         size_t ilen = 0;
 496         long unsigned sec, usec;
 497         char *tmp;
 498
 499 //      PARA_INFO_LOG("line: %s\n", line);
 500         if (!line)
 501                 return 1;
 502         itemnum = stat_line_valid(line);
 503         if (itemnum < 0) {
 504                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 505                 return 1;
 506         }
 507         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 508                 return 1;
 509         tmp = make_message("%s\n", line);
 510         stat_client_write(tmp, itemnum);
 511         free(tmp);
 512         free(stat_task->stat_item_values[itemnum]);
 513         stat_task->stat_item_values[itemnum] = para_strdup(line);
 514         ilen = strlen(status_item_list[itemnum]);
 515         switch (itemnum) {
 516         case SI_STATUS:
 517                 stat_task->playing = strstr(line, "playing")? 1 : 0;
 518                 break;
 519         case SI_OFFSET:
 520                 stat_task->offset_seconds = atoi(line + ilen + 1);
 521                 break;
 522         case SI_SECONDS_TOTAL:
 523                 stat_task->length_seconds = atoi(line + ilen + 1);
 524                 break;
 525         case SI_STREAM_START:
 526                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 527                         struct timeval a_start, delay;
 528                         delay.tv_sec = conf.stream_delay_arg / 1000;
 529                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 530                         stat_task->server_stream_start.tv_sec = sec;
 531                         stat_task->server_stream_start.tv_usec = usec;
 532                         if (compute_time_diff(NULL) > 2) {
 533                                 if (stat_task->sa_time_diff_sign < 0)
 534                                         tv_add(&stat_task->server_stream_start,
 535                                                 &stat_task->sa_time_diff, &a_start);
 536                                 else
 537                                         tv_diff(&stat_task->server_stream_start,
 538                                                 &stat_task->sa_time_diff, &a_start);
 539                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 540                         }
 541                 }
 542                 break;
 543         case SI_CURRENT_TIME:
 544                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 545                         struct timeval tv = {sec, usec};
 546                         compute_time_diff(&tv);
 547                 }
 548                 if (stat_task->clock_diff_count)
 549                         stat_task->clock_diff_count--;
 550                 break;
 551         case SI_FORMAT:
 552                 stat_task->current_audio_format_num = get_audio_format_num(
 553                         line + ilen + 1);
 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 || sl->fc) && sl->wng)
 605                         continue; /* everything already started */
 606                 if (!a->num_filters) {
 607                         if (sl->receiver_node->loaded && !sl->wng) {
 608                                 open_writers(i);
 609                                 s->timeout = min_delay;
 610                         }
 611                         continue;
 612                 }
 613                 if (sl->receiver_node->loaded && !sl->fc) {
 614                         open_filters(i);
 615                         s->timeout = min_delay;
 616                         continue;
 617                 }
 618                 if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
 619                         continue;
 620                 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
 621                         open_writers(i);
 622                         s->timeout = min_delay;
 623                         continue;
 624                 }
 625                 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
 626                 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
 627                         s->timeout = diff;
 628                 }
 629         }
 630 }
 631
 632 static void audiod_post_select(__a_unused struct sched *s,
 633         __a_unused struct task *t)
 634 {
 635         int i;
 636
 637         t->ret = 1;
 638         FOR_EACH_SLOT(i)
 639                 try_to_close_slot(i);
 640 }
 641
 642 static void init_audiod_task(struct task *t)
 643 {
 644         t->pre_select = audiod_pre_select;
 645         t->post_select = audiod_post_select;
 646         t->event_handler = NULL;
 647         t->private_data = t;
 648         sprintf(t->status, "audiod task");
 649 }
 650
 651 static int parse_stream_command(const char *txt, char **cmd)
 652 {
 653         char *p = strchr(txt, ':');
 654         int i;
 655
 656         if (!p)
 657                 return -E_MISSING_COLON;
 658         p++;
 659         FOR_EACH_AUDIO_FORMAT(i) {
 660                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 661                         continue;
 662                 *cmd = p;
 663                 return i;
 664         }
 665         return -E_UNSUPPORTED_AUDIO_FORMAT;
 666 }
 667
 668 static int add_filter(int format, char *cmdline)
 669 {
 670         struct audio_format_info *a = &afi[format];
 671         int filter_num, nf = a->num_filters;
 672
 673         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 674         if (filter_num < 0)
 675                 return filter_num;
 676         a->filters[nf] = &filters[filter_num];
 677         a->num_filters++;
 678         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
 679                 a->filters[nf]->name);
 680         return filter_num;
 681 }
 682
 683 static int init_writers(void)
 684 {
 685         int i, ret, nw;
 686         char *cmd;
 687         struct audio_format_info *a;
 688
 689         init_supported_writers();
 690         nw = PARA_MAX(1, conf.writer_given);
 691         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 692         FOR_EACH_AUDIO_FORMAT(i) {
 693                 a = &afi[i];
 694                 a->writer_conf = para_malloc(nw * sizeof(void *));
 695                 a->writers = para_malloc(nw * sizeof(struct writer *));
 696                 a->num_writers = 0;
 697         }
 698         for (i = 0; i < conf.writer_given; i++) {
 699                 void *wconf;
 700                 int writer_num;
 701                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 702                 if (ret < 0)
 703                         goto out;
 704                 a = &afi[ret];
 705                 nw = a->num_writers;
 706                 wconf = check_writer_arg(cmd, &writer_num);
 707                 if (!wconf) {
 708                         ret = writer_num;
 709                         goto out;
 710                 }
 711                 a->writers[nw] = &writers[writer_num];
 712                 a->writer_conf[nw] = wconf;
 713                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 714                         nw, writer_names[writer_num]);
 715                 a->num_writers++;
 716         }
 717         ret = 1;
 718 out:
 719         return ret;
 720 }
 721
 722 static int init_receivers(void)
 723 {
 724         int i, ret, receiver_num;
 725         char *cmd = NULL;
 726         struct audio_format_info *a;
 727
 728         for (i = 0; receivers[i].name; i++) {
 729                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
 730                 receivers[i].init(&receivers[i]);
 731         }
 732         for (i = conf.receiver_given - 1; i >= 0; i--) {
 733                 char *arg = conf.receiver_arg[i];
 734                 char *recv_arg = strchr(arg, ':');
 735                 ret = -E_MISSING_COLON;
 736                 if (!recv_arg)
 737                         goto out;
 738                 *recv_arg = '\0';
 739                 recv_arg++;
 740                 ret = get_audio_format_num(arg);
 741                 if (ret < 0)
 742                         goto out;
 743                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 744                 if (!afi[ret].receiver_conf) {
 745                         ret = -E_RECV_SYNTAX;
 746                         goto out;
 747                 }
 748                 afi[ret].receiver = &receivers[receiver_num];
 749         }
 750         /* use the first available receiver with no arguments
 751          * for those audio formats for which no receiver
 752          * was specified
 753          */
 754         cmd = para_strdup(receivers[0].name);
 755         FOR_EACH_AUDIO_FORMAT(i) {
 756                 a = &afi[i];
 757                 if (a->receiver_conf)
 758                         continue;
 759                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 760                 if (!a->receiver_conf)
 761                         return -E_RECV_SYNTAX;
 762                 a->receiver = &receivers[receiver_num];
 763         }
 764         ret = 1;
 765 out:
 766         free(cmd);
 767         return ret;
 768 }
 769
 770 static int init_default_filters(void)
 771 {
 772         int i, ret = 1;
 773
 774         FOR_EACH_AUDIO_FORMAT(i) {
 775                 struct audio_format_info *a = &afi[i];
 776                 char *tmp;
 777                 int j;
 778
 779                 if (a->num_filters)
 780                         continue; /* no default -- nothing to to */
 781                 /* add "dec" to audio format name */
 782                 tmp = make_message("%sdec", audio_formats[i]);
 783                 for (j = 0; filters[j].name; j++)
 784                         if (!strcmp(tmp, filters[j].name))
 785                                 break;
 786                 free(tmp);
 787                 ret = -E_UNSUPPORTED_FILTER;
 788                 if (!filters[j].name)
 789                         goto out;
 790                 tmp = para_strdup(filters[j].name);
 791                 ret = add_filter(i, tmp);
 792                 free(tmp);
 793                 if (ret < 0)
 794                         goto out;
 795                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 796                         filters[j].name);
 797         }
 798 out:
 799         return ret;
 800 }
 801
 802 static int init_filters(void)
 803 {
 804         int i, ret, nf;
 805
 806         filter_init(filters);
 807         nf = PARA_MAX(1,  conf.filter_given);
 808         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 809         FOR_EACH_AUDIO_FORMAT(i) {
 810                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 811                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
 812         }
 813         if (!conf.no_default_filters_given)
 814                 return init_default_filters();
 815         for (i = 0; i < conf.filter_given; i++) {
 816                 char *arg = conf.filter_arg[i];
 817                 char *filter_name = strchr(arg, ':');
 818                 ret = -E_MISSING_COLON;
 819                 if (!filter_name)
 820                         goto out;
 821                 *filter_name = '\0';
 822                 filter_name++;
 823                 ret = get_audio_format_num(arg);
 824                 if (ret < 0)
 825                         goto out;
 826                 ret = add_filter(ret, filter_name);
 827                 if (ret < 0)
 828                         goto out;
 829         }
 830         ret = init_default_filters(); /* use default values for the rest */
 831 out:
 832         return ret;
 833 }
 834
 835 static int init_stream_io(void)
 836 {
 837         int ret;
 838
 839         ret = init_writers();
 840         if (ret < 0)
 841                 return ret;
 842         ret = init_receivers();
 843         if (ret < 0)
 844                 return ret;
 845         ret = init_filters();
 846         if (ret < 0)
 847                 return ret;
 848         return 1;
 849 }
 850
 851 /* does not unlink socket on errors */
 852 static int audiod_get_socket(void)
 853 {
 854         struct sockaddr_un unix_addr;
 855         int ret, fd;
 856
 857         if (conf.socket_given)
 858                 socket_name = para_strdup(conf.socket_arg);
 859         else {
 860                 char *hn = para_hostname();
 861                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 862                         hn);
 863                 free(hn);
 864         }
 865         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 866         if (conf.force_given)
 867                 unlink(socket_name);
 868         ret = create_local_socket(socket_name, &unix_addr,
 869                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 870         if (ret < 0)
 871                 goto err;
 872         fd = ret;
 873         if (listen(fd , 5) < 0) {
 874                 ret = -ERRNO_TO_PARA_ERROR(errno);
 875                 goto err;
 876         }
 877         ret = mark_fd_nonblocking(fd);
 878         if (ret < 0)
 879                 goto err;
 880         return fd;
 881 err:
 882         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 883         exit(EXIT_FAILURE);
 884 }
 885
 886 static void signal_event_handler(struct task *t)
 887 {
 888         struct signal_task *st = t->private_data;
 889
 890         switch (st->signum) {
 891         case SIGINT:
 892         case SIGTERM:
 893         case SIGHUP:
 894                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 895                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 896         }
 897 }
 898
 899 static void signal_pre_select(struct sched *s, struct task *t)
 900 {
 901         struct signal_task *st = t->private_data;
 902         t->ret = 1;
 903         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 904 }
 905
 906 static void signal_post_select(struct sched *s, struct task *t)
 907 {
 908         struct signal_task *st = t->private_data;
 909         t->ret = 1;
 910         if (!FD_ISSET(st->fd, &s->rfds))
 911                 return;
 912         t->ret = -E_SIGNAL_CAUGHT;
 913         st->signum = para_next_signal();
 914 }
 915
 916 static void signal_setup_default(struct signal_task *st)
 917 {
 918         st->task.pre_select = signal_pre_select;
 919         st->task.post_select = signal_post_select;
 920         st->task.private_data = st;
 921         sprintf(st->task.status, "signal task");
 922 }
 923
 924 static void command_pre_select(struct sched *s, struct task *t)
 925 {
 926         struct command_task *ct = t->private_data;
 927         t->ret = 1;
 928         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 929
 930 }
 931
 932 static void command_post_select(struct sched *s, struct task *t)
 933 {
 934         int ret;
 935         struct command_task *ct = t->private_data;
 936
 937         t->ret = 1; /* always successful */
 938         audiod_status_dump();
 939         if (!FD_ISSET(ct->fd, &s->rfds))
 940                 return;
 941         ret = handle_connect(ct->fd);
 942         if (ret < 0)
 943                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 944 }
 945
 946 static void init_command_task(struct command_task *ct)
 947 {
 948         ct->task.pre_select = command_pre_select;
 949         ct->task.post_select = command_post_select;
 950         ct->task.event_handler = NULL;
 951         ct->task.private_data = ct;
 952         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 953         sprintf(ct->task.status, "command task");
 954 }
 955
 956 static void close_stat_pipe(void)
 957 {
 958         int i;
 959
 960         if (!stat_task->pcd)
 961                 return;
 962         client_close(stat_task->pcd);
 963         stat_task->pcd = NULL;
 964         FOR_EACH_STATUS_ITEM(i) {
 965                 free(stat_task->stat_item_values[i]);
 966                 stat_task->stat_item_values[i] = NULL;
 967         }
 968         dump_empty_status();
 969         stat_task->length_seconds = 0;
 970         stat_task->offset_seconds = 0;
 971         audiod_status_dump();
 972         stat_task->playing = 0;
 973         stat_task->stat_item_values[SI_BASENAME] = make_message(
 974                 "%s: no connection to para_server\n",
 975                 status_item_list[SI_BASENAME]);
 976         stat_client_write(stat_task->stat_item_values[SI_BASENAME],
 977                 SI_BASENAME);
 978         if (stat_task->clock_diff_count) {
 979                 stat_task->clock_diff_barrier.tv_sec = now->tv_sec + 1;
 980                 stat_task->clock_diff_barrier.tv_usec = now->tv_usec;
 981         }
 982 }
 983
 984 /**
 985  * close the connection to para_server and exit
 986  *
 987  * \param status the exit status which is passed to exit(3)
 988  * \param msg the log message
 989  *
 990  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
 991  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
 992  * EXIT_FAILURE.
 993  *
 994  * \sa exit(3)
 995  */
 996 void __noreturn clean_exit(int status, const char *msg)
 997 {
 998         PARA_EMERG_LOG("%s\n", msg);
 999         if (socket_name)
1000                 unlink(socket_name);
1001         close_stat_pipe();
1002         exit(status);
1003 }
1004
1005 /* avoid busy loop if server is down */
1006 static void set_stat_task_restart_barrier(void)
1007 {
1008         struct timeval delay = {5, 0};
1009         tv_add(now, &delay, &stat_task->restart_barrier);
1010 }
1011
1012 static void client_task_event_handler(__a_unused struct task *t)
1013 {
1014         int i;
1015
1016         if (t->ret == -E_HANDSHAKE_COMPLETE)
1017                 return;
1018         unregister_task(t);
1019         close_stat_pipe();
1020         if (t->ret != -E_SERVER_EOF)
1021                 stat_task->clock_diff_count = conf.clock_diff_count_arg;
1022         set_stat_task_restart_barrier();
1023         FOR_EACH_AUDIO_FORMAT(i)
1024                 afi[i].restart_barrier = stat_task->restart_barrier;
1025 }
1026
1027 static void status_pre_select(struct sched *s, struct task *t)
1028 {
1029         struct status_task *st = t->private_data;
1030         int ret;
1031
1032         t->ret = 1; /* always successful */
1033         if (st->pcd || audiod_status == AUDIOD_OFF)
1034                 return;
1035         if (!st->clock_diff_count && tv_diff(now, &st->restart_barrier, NULL)
1036                         < 0)
1037                 return;
1038         if (st->clock_diff_count) {
1039                 char *argv[] = {"audiod", "stat", "1", NULL};
1040                 int argc = 3;
1041                 if (tv_diff(now, &st->clock_diff_barrier, NULL) < 0)
1042                         return;
1043                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1044                 ret = client_open(argc, argv, &st->pcd);
1045
1046         } else {
1047                 char *argv[] = {"audiod", "stat", NULL};
1048                 int argc = 2;
1049                 ret = client_open(argc, argv, &st->pcd);
1050         }
1051         set_stat_task_restart_barrier();
1052         if (ret < 0)
1053                 return;
1054         st->pcd->task.event_handler = client_task_event_handler;
1055         s->timeout.tv_sec = 0;
1056         s->timeout.tv_usec = 1;
1057 }
1058
1059 static void status_post_select(__a_unused struct sched *s, struct task *t)
1060 {
1061         struct status_task *st = t->private_data;
1062         unsigned bytes_left;
1063
1064         t->ret = 1;
1065         if (!st->pcd || st->pcd->status != CL_RECEIVING)
1066                 return;
1067         if (st->pcd && audiod_status == AUDIOD_OFF) {
1068                 unregister_task(&st->pcd->task);
1069                 close_stat_pipe();
1070                 st->clock_diff_count = conf.clock_diff_count_arg;
1071                 return;
1072         }
1073         bytes_left = for_each_line(st->pcd->buf, st->pcd->loaded,
1074                 &check_stat_line, NULL);
1075         if (st->pcd->loaded != bytes_left) {
1076                 st->last_status_read = *now;
1077                 st->pcd->loaded = bytes_left;
1078         } else {
1079                 struct timeval diff;
1080                 tv_diff(now, &st->last_status_read, &diff);
1081                 if (diff.tv_sec > 61)
1082                         close_stat_pipe();
1083         }
1084 }
1085
1086 static void init_status_task(struct status_task *st)
1087 {
1088         memset(st, 0, sizeof(struct status_task));
1089         st->task.pre_select = status_pre_select;
1090         st->task.post_select = status_post_select;
1091         st->task.private_data = st;
1092         st->sa_time_diff_sign = 1;
1093         st->clock_diff_count = conf.clock_diff_count_arg;
1094         st->current_audio_format_num = -1;
1095         sprintf(st->task.status, "status task");
1096 }
1097
1098 static void set_initial_status(void)
1099 {
1100         audiod_status = AUDIOD_ON;
1101         if (!conf.mode_given)
1102                 return;
1103         if (!strcmp(conf.mode_arg, "sb")) {
1104                 audiod_status = AUDIOD_STANDBY;
1105                 return;
1106         }
1107         if (!strcmp(conf.mode_arg, "off")) {
1108                 audiod_status = AUDIOD_OFF;
1109                 return;
1110         }
1111         if (strcmp(conf.mode_arg, "on"))
1112                 PARA_WARNING_LOG("%s", "invalid mode\n");
1113 }
1114
1115 /**
1116  * the main function of para_audiod
1117  *
1118  * \param argc usual argument count
1119  * \param argv usual argument vector
1120  *
1121  * \return EXIT_SUCCESS or EXIT_FAILURE
1122  *
1123  * \sa para_audiod(1)
1124  * */
1125 int main(int argc, char *argv[])
1126 {
1127         char *config_file;
1128         int ret, i;
1129         struct sched s;
1130         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1131         struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1132
1133         valid_fd_012();
1134         audiod_cmdline_parser(argc, argv, &conf);
1135         HANDLE_VERSION_FLAG("audiod", conf);
1136         para_drop_privileges(conf.user_arg, conf.group_arg);
1137         config_file = configfile_exists();
1138         if (config_file) {
1139                 struct audiod_cmdline_parser_params params = {
1140                         .override = 0,
1141                         .initialize = 0,
1142                         .check_required = 0,
1143                         .check_ambiguity = 0
1144
1145                 };
1146                 if (audiod_cmdline_parser_config_file(config_file, &conf, &params)) {
1147                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1148                         exit(EXIT_FAILURE);
1149                 }
1150                 free(config_file);
1151         }
1152         if (conf.logfile_given)
1153                 logfile = open_log(conf.logfile_arg);
1154         log_welcome("para_audiod", conf.loglevel_arg);
1155         i = init_stream_io();
1156         if (i < 0) {
1157                 PARA_EMERG_LOG("init stream io error: %s\n", para_strerror(-i));
1158                 exit(EXIT_FAILURE);
1159         }
1160         server_uptime(UPTIME_SET);
1161         set_initial_status();
1162         FOR_EACH_SLOT(i)
1163                 clear_slot(i);
1164         init_grabbing();
1165         setup_signal_handling();
1166         signal_setup_default(sig_task);
1167         sig_task->task.event_handler = signal_event_handler;
1168
1169         init_status_task(stat_task);
1170         init_command_task(cmd_task);
1171         init_audiod_task(audiod_task);
1172
1173         if (conf.daemon_given)
1174                 daemon_init();
1175
1176         register_task(&sig_task->task);
1177         register_task(&cmd_task->task);
1178         register_task(&stat_task->task);
1179         register_task(audiod_task);
1180         s.default_timeout.tv_sec = 0;
1181         s.default_timeout.tv_usec = 99 * 1000;
1182         ret = schedule(&s);
1183
1184         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1185         return EXIT_FAILURE;
1186 }