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->task.error) {
 216                         PARA_INFO_LOG("unregistering writer node group in slot %d\n",
 217                                 i);
 218                         wng_unregister(s->wng);
 219                         s->wng->task.error = error;
 220                 }
 221                 if (s->fc && !s->fc->task.error) {
 222                         PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
 223                         unregister_task(&s->fc->task);
 224                         s->fc->task.error = error;
 225                 }
 226                 if (s->receiver_node && !s->receiver_node->task.error) {
 227                         PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
 228                         unregister_task(&s->receiver_node->task);
 229                         s->receiver_node->task.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 open_filters(int slot_num)
 268 {
 269         struct slot_info *s = &slot[slot_num];
 270         struct audio_format_info *a = &afi[s->format];
 271         int nf = a->num_filters;
 272         int i;
 273
 274         s->fc = NULL;
 275         if (!nf)
 276                 return;
 277         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 278         s->fc = para_calloc(sizeof(struct filter_chain));
 279         INIT_LIST_HEAD(&s->fc->filters);
 280         s->fc->inbuf = s->receiver_node->buf;
 281         s->fc->in_loaded = &s->receiver_node->loaded;
 282         s->fc->input_error = &s->receiver_node->task.error;
 283         s->fc->task.pre_select = filter_pre_select;
 284         s->fc->task.error = 0;
 285
 286         s->receiver_node->output_error = &s->fc->task.error;
 287         sprintf(s->fc->task.status, "filter chain");
 288         for (i = 0; i < nf; i++) {
 289                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 290                 fn->conf = a->filter_conf[i];
 291                 fn->fc = s->fc;
 292                 fn->filter = a->filters[i];
 293                 INIT_LIST_HEAD(&fn->callbacks);
 294                 list_add_tail(&fn->node, &s->fc->filters);
 295                 fn->filter->open(fn);
 296                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 297                         audio_formats[s->format], i + 1,  nf,
 298                         fn->filter->name, slot_num);
 299                 s->fc->outbuf = fn->buf;
 300                 s->fc->out_loaded = &fn->loaded;
 301         }
 302         register_task(&s->fc->task);
 303 }
 304
 305 static void open_writers(int slot_num)
 306 {
 307         int ret, i;
 308         struct slot_info *s = &slot[slot_num];
 309         struct audio_format_info *a = &afi[s->format];
 310
 311         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 312         if (!a->num_writers)
 313                 s->wng = setup_default_wng();
 314         else
 315                 s->wng = wng_new(a->num_writers);
 316         if (s->fc) {
 317                 s->wng->buf = s->fc->outbuf;
 318                 s->wng->loaded = s->fc->out_loaded;
 319                 s->wng->input_error = &s->fc->task.error;
 320                 s->wng->channels = &s->fc->channels;
 321                 s->wng->samplerate = &s->fc->samplerate;
 322                 s->fc->output_error = &s->wng->task.error;
 323                 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
 324         } else {
 325                 s->wng->buf = s->receiver_node->buf;
 326                 s->wng->loaded = &s->receiver_node->loaded;
 327                 s->wng->input_error = &s->receiver_node->task.error;
 328         }
 329         for (i = 0; i < a->num_writers; i++) {
 330                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 331                 s->wng->writer_nodes[i].writer = a->writers[i];
 332         }
 333         ret = wng_open(s->wng);
 334         if (ret < 0) {
 335                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 336                 return;
 337         }
 338         s->wstime = *now;
 339         activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
 340 }
 341
 342 #if 0
 343 static void rn_event_handler(struct task *t)
 344 {
 345         struct receiver_node *rn = t->private_data;
 346         int i;
 347
 348         PARA_NOTICE_LOG("%s\n", para_strerror(-t->ret));
 349         unregister_task(t);
 350         rn->error = t->ret;
 351         /* set restart barrier */
 352         FOR_EACH_SLOT(i) {
 353                 struct timeval restart_delay = {0, 10 * 1000};
 354                 if (slot[i].receiver_node != rn)
 355                         continue;
 356                 if (rn->error != -E_RECV_EOF)
 357                         /* don't reconnect immediately on errors */
 358                         restart_delay.tv_sec = 5;
 359                 tv_add(now, &restart_delay, &afi[slot[i].format].restart_barrier);
 360         }
 361 }
 362 #endif
 363
 364 static int open_receiver(int format)
 365 {
 366         struct audio_format_info *a = &afi[format];
 367         struct slot_info *s;
 368         int ret, slot_num;
 369         struct receiver_node *rn;
 370         const struct timeval restart_delay = {1, 0};
 371
 372         ret = get_empty_slot();
 373         if (ret < 0)
 374                 goto err;
 375         slot_num = ret;
 376         s = &slot[slot_num];
 377         s->format = format;
 378         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 379         rn = s->receiver_node;
 380         rn->receiver = a->receiver;
 381         rn->conf = a->receiver_conf;
 382         ret = a->receiver->open(s->receiver_node);
 383         if (ret < 0) {
 384                 free(s->receiver_node);
 385                 s->receiver_node = NULL;
 386                 goto err;
 387         }
 388         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 389                 audio_formats[s->format], a->receiver->name, slot_num);
 390         rn->task.pre_select = a->receiver->pre_select;
 391         rn->task.post_select = a->receiver->post_select;
 392         sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
 393         register_task(&rn->task);
 394         return 1;
 395 err:
 396         PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 397         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 398         return ret;
 399 }
 400
 401 static int receiver_running(int format)
 402 {
 403         int i;
 404
 405         FOR_EACH_SLOT(i) {
 406                 struct slot_info *s = &slot[i];
 407                 if (s->format == format && s->receiver_node
 408                                 && s->receiver_node->task.error >= 0)
 409                         return 1;
 410         }
 411         return 0;
 412 }
 413
 414 static int open_current_receiver(struct sched *s)
 415 {
 416         struct timeval diff;
 417         int cafn = stat_task->current_audio_format_num;
 418
 419         if (cafn < 0 || !stat_task->ct)
 420                 return 0;
 421         if (receiver_running(cafn))
 422                 return 0;
 423         if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
 424                 s->timeout = diff;
 425                 return 0;
 426         }
 427         return open_receiver(cafn) < 0? 0 : 1;
 428 }
 429
 430 static unsigned compute_time_diff(const struct timeval *status_time)
 431 {
 432         struct timeval tmp, diff;
 433         static unsigned count;
 434         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 435         const struct timeval max_deviation = {0, 500 * 1000};
 436         const int time_smooth = 5;
 437
 438         if (!status_time)
 439                 return count;
 440         sign = tv_diff(status_time, now, &diff);
 441 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 442 //                      sign, sa_time_diff_sign);
 443         if (!count) {
 444                 sa_time_diff_sign = sign;
 445                 stat_task->sa_time_diff = diff;
 446                 count++;
 447                 goto out;
 448         }
 449         if (count > 5) {
 450                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 451                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 452                         PARA_WARNING_LOG("time diff jump: %lims\n",
 453                                 s * tv2ms(&tmp));
 454         }
 455         count++;
 456         sa_time_diff_sign = tv_convex_combination(
 457                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 458                 count > 10? sign : sign * time_smooth, &diff,
 459                 &tmp);
 460         stat_task->sa_time_diff = tmp;
 461         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 462                 sign > 0? "+" : "-",
 463                 tv2ms(&diff),
 464                 sa_time_diff_sign ? "+" : "-",
 465                 tv2ms(&stat_task->sa_time_diff)
 466         );
 467 out:
 468         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 469         return count;
 470 }
 471
 472 static int check_stat_line(char *line, __a_unused void *data)
 473 {
 474         int itemnum;
 475         size_t ilen = 0;
 476         long unsigned sec, usec;
 477         char *tmp;
 478
 479         //PARA_INFO_LOG("line: %s\n", line);
 480         if (!line)
 481                 return 1;
 482         itemnum = stat_line_valid(line);
 483         if (itemnum < 0) {
 484                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 485                 return 1;
 486         }
 487         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 488                 return 1;
 489         tmp = make_message("%s\n", line);
 490         stat_client_write(tmp, itemnum);
 491         free(tmp);
 492         free(stat_task->stat_item_values[itemnum]);
 493         stat_task->stat_item_values[itemnum] = para_strdup(line);
 494         ilen = strlen(status_item_list[itemnum]);
 495         switch (itemnum) {
 496         case SI_STATUS:
 497                 stat_task->playing = strstr(line, "playing")? 1 : 0;
 498                 PARA_INFO_LOG("stat task playing: %d\n", stat_task->playing);
 499                 break;
 500         case SI_OFFSET:
 501                 stat_task->offset_seconds = atoi(line + ilen + 1);
 502                 break;
 503         case SI_SECONDS_TOTAL:
 504                 stat_task->length_seconds = atoi(line + ilen + 1);
 505                 break;
 506         case SI_STREAM_START:
 507                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 508                         struct timeval a_start, delay;
 509                         delay.tv_sec = conf.stream_delay_arg / 1000;
 510                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 511                         stat_task->server_stream_start.tv_sec = sec;
 512                         stat_task->server_stream_start.tv_usec = usec;
 513                         if (compute_time_diff(NULL) > 2) {
 514                                 if (stat_task->sa_time_diff_sign < 0)
 515                                         tv_add(&stat_task->server_stream_start,
 516                                                 &stat_task->sa_time_diff, &a_start);
 517                                 else
 518                                         tv_diff(&stat_task->server_stream_start,
 519                                                 &stat_task->sa_time_diff, &a_start);
 520                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 521                         }
 522                 }
 523                 break;
 524         case SI_CURRENT_TIME:
 525                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 526                         struct timeval tv = {sec, usec};
 527                         compute_time_diff(&tv);
 528                 }
 529                 if (stat_task->clock_diff_count)
 530                         stat_task->clock_diff_count--;
 531                 break;
 532         case SI_FORMAT:
 533                 stat_task->current_audio_format_num = get_audio_format_num(
 534                         line + ilen + 1);
 535         }
 536         return 1;
 537 }
 538
 539 static void try_to_close_slot(int slot_num)
 540 {
 541         struct slot_info *s = &slot[slot_num];
 542
 543         if (s->format < 0)
 544                 return;
 545         if (s->receiver_node && s->receiver_node->task.error >= 0)
 546                 return;
 547         if (s->fc && s->fc->task.error >= 0)
 548                 return;
 549         if (s->wng && s->wng->task.error >= 0)
 550                 return;
 551         PARA_INFO_LOG("closing slot %d\n", slot_num);
 552         wng_close(s->wng);
 553         close_filters(s->fc);
 554         free(s->fc);
 555         close_receiver(slot_num);
 556         clear_slot(slot_num);
 557 }
 558
 559 /*
 560  * Check if any receivers/filters/writers need to be started and do so if
 561  * necessary.  Since the pre_select function didn't have a chance yet to put
 562  * file descriptors into the fd sets given by s, make the upcoming select()
 563  * return immediately to avoid a long timeout in case we started something.
 564  */
 565 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
 566 {
 567         int i;
 568         struct timeval min_delay = {0, 1};
 569
 570         if (audiod_status != AUDIOD_ON || !stat_task->playing)
 571                 return kill_all_decoders(-E_NOT_PLAYING);
 572         if (open_current_receiver(s))
 573                 s->timeout = min_delay;
 574         FOR_EACH_SLOT(i) {
 575                 struct slot_info *sl = &slot[i];
 576                 struct audio_format_info *a;
 577                 struct timeval diff;
 578
 579                 if (sl->format < 0)
 580                         continue;
 581                 a = &afi[sl->format];
 582                 if (!sl->receiver_node)
 583                         continue;
 584                 if ((!a->num_filters || sl->fc) && sl->wng)
 585                         continue; /* everything already started */
 586                 if (!a->num_filters) {
 587                         if (sl->receiver_node->loaded && !sl->wng) {
 588                                 open_writers(i);
 589                                 s->timeout = min_delay;
 590                         }
 591                         continue;
 592                 }
 593                 if (sl->receiver_node->loaded && !sl->fc) {
 594                         open_filters(i);
 595                         s->timeout = min_delay;
 596                         continue;
 597                 }
 598                 if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
 599                         continue;
 600                 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
 601                         open_writers(i);
 602                         s->timeout = min_delay;
 603                         continue;
 604                 }
 605                 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
 606                 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
 607                         s->timeout = diff;
 608                 }
 609         }
 610 }
 611
 612 static void audiod_post_select(__a_unused struct sched *s,
 613         __a_unused struct task *t)
 614 {
 615         int i;
 616
 617         FOR_EACH_SLOT(i)
 618                 try_to_close_slot(i);
 619 }
 620
 621 static void init_audiod_task(struct task *t)
 622 {
 623         t->pre_select = audiod_pre_select;
 624         t->post_select = audiod_post_select;
 625         t->error = 0;
 626         sprintf(t->status, "audiod task");
 627 }
 628
 629 static int parse_stream_command(const char *txt, char **cmd)
 630 {
 631         char *p = strchr(txt, ':');
 632         int i;
 633
 634         if (!p)
 635                 return -E_MISSING_COLON;
 636         p++;
 637         FOR_EACH_AUDIO_FORMAT(i) {
 638                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 639                         continue;
 640                 *cmd = p;
 641                 return i;
 642         }
 643         return -E_UNSUPPORTED_AUDIO_FORMAT;
 644 }
 645
 646 static int add_filter(int format, char *cmdline)
 647 {
 648         struct audio_format_info *a = &afi[format];
 649         int filter_num, nf = a->num_filters;
 650
 651         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 652         if (filter_num < 0)
 653                 return filter_num;
 654         a->filters[nf] = &filters[filter_num];
 655         a->num_filters++;
 656         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
 657                 a->filters[nf]->name);
 658         return filter_num;
 659 }
 660
 661 static int init_writers(void)
 662 {
 663         int i, ret, nw;
 664         char *cmd;
 665         struct audio_format_info *a;
 666
 667         init_supported_writers();
 668         nw = PARA_MAX(1, conf.writer_given);
 669         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 670         FOR_EACH_AUDIO_FORMAT(i) {
 671                 a = &afi[i];
 672                 a->writer_conf = para_malloc(nw * sizeof(void *));
 673                 a->writers = para_malloc(nw * sizeof(struct writer *));
 674                 a->num_writers = 0;
 675         }
 676         for (i = 0; i < conf.writer_given; i++) {
 677                 void *wconf;
 678                 int writer_num;
 679                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 680                 if (ret < 0)
 681                         goto out;
 682                 a = &afi[ret];
 683                 nw = a->num_writers;
 684                 wconf = check_writer_arg(cmd, &writer_num);
 685                 if (!wconf) {
 686                         ret = writer_num;
 687                         goto out;
 688                 }
 689                 a->writers[nw] = &writers[writer_num];
 690                 a->writer_conf[nw] = wconf;
 691                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 692                         nw, writer_names[writer_num]);
 693                 a->num_writers++;
 694         }
 695         ret = 1;
 696 out:
 697         return ret;
 698 }
 699
 700 static int init_receivers(void)
 701 {
 702         int i, ret, receiver_num;
 703         char *cmd = NULL;
 704         struct audio_format_info *a;
 705
 706         for (i = 0; receivers[i].name; i++) {
 707                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
 708                 receivers[i].init(&receivers[i]);
 709         }
 710         for (i = conf.receiver_given - 1; i >= 0; i--) {
 711                 char *arg = conf.receiver_arg[i];
 712                 char *recv_arg = strchr(arg, ':');
 713                 ret = -E_MISSING_COLON;
 714                 if (!recv_arg)
 715                         goto out;
 716                 *recv_arg = '\0';
 717                 recv_arg++;
 718                 ret = get_audio_format_num(arg);
 719                 if (ret < 0)
 720                         goto out;
 721                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 722                 if (!afi[ret].receiver_conf) {
 723                         ret = -E_RECV_SYNTAX;
 724                         goto out;
 725                 }
 726                 afi[ret].receiver = &receivers[receiver_num];
 727         }
 728         /* use the first available receiver with no arguments
 729          * for those audio formats for which no receiver
 730          * was specified
 731          */
 732         cmd = para_strdup(receivers[0].name);
 733         FOR_EACH_AUDIO_FORMAT(i) {
 734                 a = &afi[i];
 735                 if (a->receiver_conf)
 736                         continue;
 737                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 738                 if (!a->receiver_conf)
 739                         return -E_RECV_SYNTAX;
 740                 a->receiver = &receivers[receiver_num];
 741         }
 742         ret = 1;
 743 out:
 744         free(cmd);
 745         return ret;
 746 }
 747
 748 static int init_default_filters(void)
 749 {
 750         int i, ret = 1;
 751
 752         FOR_EACH_AUDIO_FORMAT(i) {
 753                 struct audio_format_info *a = &afi[i];
 754                 char *tmp;
 755                 int j;
 756
 757                 if (a->num_filters)
 758                         continue; /* no default -- nothing to to */
 759                 /* add "dec" to audio format name */
 760                 tmp = make_message("%sdec", audio_formats[i]);
 761                 for (j = 0; filters[j].name; j++)
 762                         if (!strcmp(tmp, filters[j].name))
 763                                 break;
 764                 free(tmp);
 765                 ret = -E_UNSUPPORTED_FILTER;
 766                 if (!filters[j].name)
 767                         goto out;
 768                 tmp = para_strdup(filters[j].name);
 769                 ret = add_filter(i, tmp);
 770                 free(tmp);
 771                 if (ret < 0)
 772                         goto out;
 773                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 774                         filters[j].name);
 775         }
 776 out:
 777         return ret;
 778 }
 779
 780 static int init_filters(void)
 781 {
 782         int i, ret, nf;
 783
 784         filter_init(filters);
 785         nf = PARA_MAX(1,  conf.filter_given);
 786         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 787         FOR_EACH_AUDIO_FORMAT(i) {
 788                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 789                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
 790         }
 791         if (!conf.no_default_filters_given)
 792                 return init_default_filters();
 793         for (i = 0; i < conf.filter_given; i++) {
 794                 char *arg = conf.filter_arg[i];
 795                 char *filter_name = strchr(arg, ':');
 796                 ret = -E_MISSING_COLON;
 797                 if (!filter_name)
 798                         goto out;
 799                 *filter_name = '\0';
 800                 filter_name++;
 801                 ret = get_audio_format_num(arg);
 802                 if (ret < 0)
 803                         goto out;
 804                 ret = add_filter(ret, filter_name);
 805                 if (ret < 0)
 806                         goto out;
 807         }
 808         ret = init_default_filters(); /* use default values for the rest */
 809 out:
 810         return ret;
 811 }
 812
 813 static int init_stream_io(void)
 814 {
 815         int ret;
 816
 817         ret = init_writers();
 818         if (ret < 0)
 819                 return ret;
 820         ret = init_receivers();
 821         if (ret < 0)
 822                 return ret;
 823         ret = init_filters();
 824         if (ret < 0)
 825                 return ret;
 826         return 1;
 827 }
 828
 829 /* does not unlink socket on errors */
 830 static int audiod_get_socket(void)
 831 {
 832         struct sockaddr_un unix_addr;
 833         int ret, fd;
 834
 835         if (conf.socket_given)
 836                 socket_name = para_strdup(conf.socket_arg);
 837         else {
 838                 char *hn = para_hostname();
 839                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 840                         hn);
 841                 free(hn);
 842         }
 843         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 844         if (conf.force_given)
 845                 unlink(socket_name);
 846         ret = create_local_socket(socket_name, &unix_addr,
 847                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 848         if (ret < 0)
 849                 goto err;
 850         fd = ret;
 851         if (listen(fd , 5) < 0) {
 852                 ret = -ERRNO_TO_PARA_ERROR(errno);
 853                 goto err;
 854         }
 855         ret = mark_fd_nonblocking(fd);
 856         if (ret < 0)
 857                 goto err;
 858         return fd;
 859 err:
 860         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 861         exit(EXIT_FAILURE);
 862 }
 863
 864 static void signal_pre_select(struct sched *s, struct task *t)
 865 {
 866         struct signal_task *st = container_of(t, struct signal_task, task);
 867         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 868 }
 869
 870 static void signal_post_select(struct sched *s, struct task *t)
 871 {
 872         struct signal_task *st = container_of(t, struct signal_task, task);
 873         int signum;
 874
 875         if (!FD_ISSET(st->fd, &s->rfds))
 876                 return;
 877
 878         signum = para_next_signal();
 879         switch (signum) {
 880         case SIGINT:
 881         case SIGTERM:
 882         case SIGHUP:
 883                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 884                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 885         }
 886 }
 887
 888 static void signal_setup_default(struct signal_task *st)
 889 {
 890         st->task.pre_select = signal_pre_select;
 891         st->task.post_select = signal_post_select;
 892         sprintf(st->task.status, "signal task");
 893 }
 894
 895 static void command_pre_select(struct sched *s, struct task *t)
 896 {
 897         struct command_task *ct = container_of(t, struct command_task, task);
 898         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 899 }
 900
 901 static void command_post_select(struct sched *s, struct task *t)
 902 {
 903         int ret;
 904         struct command_task *ct = container_of(t, struct command_task, task);
 905
 906         audiod_status_dump();
 907         if (!FD_ISSET(ct->fd, &s->rfds))
 908                 return;
 909         ret = handle_connect(ct->fd);
 910         if (ret < 0)
 911                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 912 }
 913
 914 static void init_command_task(struct command_task *ct)
 915 {
 916         ct->task.pre_select = command_pre_select;
 917         ct->task.post_select = command_post_select;
 918         ct->task.error = 0;
 919         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 920         sprintf(ct->task.status, "command task");
 921 }
 922
 923 static void close_stat_pipe(void)
 924 {
 925         int i;
 926
 927         if (!stat_task->ct)
 928                 return;
 929         client_close(stat_task->ct);
 930         stat_task->ct = NULL;
 931         FOR_EACH_STATUS_ITEM(i) {
 932                 free(stat_task->stat_item_values[i]);
 933                 stat_task->stat_item_values[i] = NULL;
 934         }
 935         dump_empty_status();
 936         stat_task->length_seconds = 0;
 937         stat_task->offset_seconds = 0;
 938         audiod_status_dump();
 939         stat_task->playing = 0;
 940         stat_task->stat_item_values[SI_BASENAME] = make_message(
 941                 "%s: no connection to para_server\n",
 942                 status_item_list[SI_BASENAME]);
 943         stat_client_write(stat_task->stat_item_values[SI_BASENAME],
 944                 SI_BASENAME);
 945         if (stat_task->clock_diff_count) {
 946                 stat_task->clock_diff_barrier.tv_sec = now->tv_sec + 1;
 947                 stat_task->clock_diff_barrier.tv_usec = now->tv_usec;
 948         }
 949 }
 950
 951 /**
 952  * close the connection to para_server and exit
 953  *
 954  * \param status the exit status which is passed to exit(3)
 955  * \param msg the log message
 956  *
 957  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
 958  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
 959  * EXIT_FAILURE.
 960  *
 961  * \sa exit(3)
 962  */
 963 void __noreturn clean_exit(int status, const char *msg)
 964 {
 965         PARA_EMERG_LOG("%s\n", msg);
 966         if (socket_name)
 967                 unlink(socket_name);
 968         close_stat_pipe();
 969         exit(status);
 970 }
 971
 972 /* avoid busy loop if server is down */
 973 static void set_stat_task_restart_barrier(void)
 974 {
 975         struct timeval delay = {5, 0};
 976         tv_add(now, &delay, &stat_task->restart_barrier);
 977 }
 978
 979 /* restart the client task if necessary */
 980 static void status_pre_select(struct sched *s, struct task *t)
 981 {
 982         struct status_task *st = container_of(t, struct status_task, task);
 983         int ret;
 984
 985         if (st->ct || audiod_status == AUDIOD_OFF) /* no need to restart */
 986                 return;
 987         if (!st->clock_diff_count && tv_diff(now, &st->restart_barrier, NULL)
 988                         < 0)
 989                 return;
 990         if (st->clock_diff_count) { /* get status only one time */
 991                 char *argv[] = {"audiod", "stat", "1", NULL};
 992                 int argc = 3;
 993                 if (tv_diff(now, &st->clock_diff_barrier, NULL) < 0)
 994                         return;
 995                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
 996                 ret = client_open(argc, argv, &st->ct);
 997
 998         } else {
 999                 char *argv[] = {"audiod", "stat", NULL};
1000                 int argc = 2;
1001                 ret = client_open(argc, argv, &st->ct);
1002         }
1003         set_stat_task_restart_barrier();
1004         if (ret < 0)
1005                 return;
1006         s->timeout.tv_sec = 0;
1007         s->timeout.tv_usec = 1;
1008 }
1009
1010 static void status_post_select(__a_unused struct sched *s, struct task *t)
1011 {
1012         struct status_task *st = container_of(t, struct status_task, task);
1013         unsigned bytes_left;
1014
1015         if (!st->ct || st->ct->status != CL_RECEIVING)
1016                 return;
1017         if (audiod_status == AUDIOD_OFF || st->ct->task.error < 0) {
1018                 if (st->ct->task.error >= 0)
1019                         unregister_task(&st->ct->task);
1020                 if (audiod_status == AUDIOD_OFF)
1021                         st->clock_diff_count = conf.clock_diff_count_arg;
1022                 close_stat_pipe();
1023                 return;
1024         }
1025         bytes_left = for_each_line(st->ct->buf, st->ct->loaded,
1026                 &check_stat_line, NULL);
1027         if (st->ct->loaded != bytes_left) {
1028                 st->last_status_read = *now;
1029                 st->ct->loaded = bytes_left;
1030         } else {
1031                 struct timeval diff;
1032                 tv_diff(now, &st->last_status_read, &diff);
1033                 if (diff.tv_sec > 61)
1034                         close_stat_pipe();
1035         }
1036 }
1037
1038 static void init_status_task(struct status_task *st)
1039 {
1040         memset(st, 0, sizeof(struct status_task));
1041         st->task.pre_select = status_pre_select;
1042         st->task.post_select = status_post_select;
1043         st->sa_time_diff_sign = 1;
1044         st->clock_diff_count = conf.clock_diff_count_arg;
1045         st->current_audio_format_num = -1;
1046         sprintf(st->task.status, "status task");
1047 }
1048
1049 static void set_initial_status(void)
1050 {
1051         audiod_status = AUDIOD_ON;
1052         if (!conf.mode_given)
1053                 return;
1054         if (!strcmp(conf.mode_arg, "sb")) {
1055                 audiod_status = AUDIOD_STANDBY;
1056                 return;
1057         }
1058         if (!strcmp(conf.mode_arg, "off")) {
1059                 audiod_status = AUDIOD_OFF;
1060                 return;
1061         }
1062         if (strcmp(conf.mode_arg, "on"))
1063                 PARA_WARNING_LOG("invalid mode\n");
1064 }
1065
1066 /**
1067  * the main function of para_audiod
1068  *
1069  * \param argc usual argument count
1070  * \param argv usual argument vector
1071  *
1072  * \return EXIT_SUCCESS or EXIT_FAILURE
1073  *
1074  * \sa para_audiod(1)
1075  * */
1076 int main(int argc, char *argv[])
1077 {
1078         char *config_file;
1079         int ret, i;
1080         struct sched s;
1081         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1082         struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1083
1084         valid_fd_012();
1085         audiod_cmdline_parser(argc, argv, &conf);
1086         HANDLE_VERSION_FLAG("audiod", conf);
1087         para_drop_privileges(conf.user_arg, conf.group_arg);
1088         config_file = configfile_exists();
1089         if (config_file) {
1090                 struct audiod_cmdline_parser_params params = {
1091                         .override = 0,
1092                         .initialize = 0,
1093                         .check_required = 0,
1094                         .check_ambiguity = 0
1095
1096                 };
1097                 if (audiod_cmdline_parser_config_file(config_file, &conf, &params)) {
1098                         PARA_EMERG_LOG("parse error in config file\n");
1099                         exit(EXIT_FAILURE);
1100                 }
1101                 free(config_file);
1102         }
1103         if (conf.logfile_given)
1104                 logfile = open_log(conf.logfile_arg);
1105         log_welcome("para_audiod", conf.loglevel_arg);
1106         i = init_stream_io();
1107         if (i < 0) {
1108                 PARA_EMERG_LOG("init stream io error: %s\n", para_strerror(-i));
1109                 exit(EXIT_FAILURE);
1110         }
1111         server_uptime(UPTIME_SET);
1112         set_initial_status();
1113         FOR_EACH_SLOT(i)
1114                 clear_slot(i);
1115         init_grabbing();
1116         setup_signal_handling();
1117         signal_setup_default(sig_task);
1118
1119         init_status_task(stat_task);
1120         init_command_task(cmd_task);
1121         init_audiod_task(audiod_task);
1122
1123         if (conf.daemon_given)
1124                 daemon_init();
1125
1126         register_task(&sig_task->task);
1127         register_task(&cmd_task->task);
1128         register_task(&stat_task->task);
1129         register_task(audiod_task);
1130         s.default_timeout.tv_sec = 0;
1131         s.default_timeout.tv_usec = 99 * 1000;
1132         ret = schedule(&s);
1133
1134         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1135         return EXIT_FAILURE;
1136 }