audiod.c

   1 /*
   2  * Copyright (C) 2005-2007 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
   9 #include "para.h"
  10 #include "error.h"
  11 #include "audiod.cmdline.h"
  12 #include "list.h"
  13 #include "sched.h"
  14 #include "recv.h"
  15 #include "filter.h"
  16 #include "grab_client.cmdline.h"
  17 #include "grab_client.h"
  18 #include "client.cmdline.h"
  19 #include "client.h"
  20 #include "audiod.h"
  21 #include "net.h"
  22 #include "daemon.h"
  23 #include "string.h"
  24 #include "fd.h"
  25 #include "write.h"
  26 #include "write_common.h"
  27 #include "signal.h"
  28
  29 /** define the array of error lists needed by para_audiod */
  30 INIT_AUDIOD_ERRLISTS;
  31 /** define the array containing all supported audio formats */
  32 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
  33
  34 /** defines how to handle one supported audio format */
  35 struct audio_format_info {
  36         /** pointer to the receiver for this audio format */
  37         struct receiver *receiver;
  38         /** the receiver configuration */
  39         void *receiver_conf;
  40         /** the number of filters that should be activated for this audio format */
  41         unsigned int num_filters;
  42         /** pointer to the array of filters to be activated */
  43         struct filter **filters;
  44         /** pointer to the array of filter configurations */
  45         void **filter_conf;
  46         /** the number of filters that should be activated for this audio format */
  47         unsigned int num_writers;
  48         /** pointer to the array of writers to be activated */
  49         struct writer **writers;
  50         /** pointer to the array of writer configurations */
  51         void **writer_conf;
  52         /** do not start receiver/filters/writer before this time */
  53         struct timeval restart_barrier;
  54 };
  55
  56 /**
  57  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  58  * be associated with a receiver/filter/writer triple. This array holds all
  59  * information on the status of these slots.
  60  *
  61  * \sa struct slot_info
  62  * */
  63 struct slot_info slot[MAX_STREAM_SLOTS];
  64
  65
  66 /**
  67  * the current mode of operation of which can be changed by the on/off/cycle
  68  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
  69  */
  70 int audiod_status = AUDIOD_ON;
  71
  72 /**
  73  * the gengetopt args_info struct that holds information on all command line
  74  * arguments
  75  */
  76 struct audiod_args_info conf;
  77
  78 static char *socket_name;
  79 static FILE *logfile;
  80 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
  81
  82 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
  83
  84 static struct status_task status_task_struct;
  85
  86 /**
  87  * the task that calls the status command of para_server
  88  *
  89  * \sa struct status_task
  90  */
  91 struct status_task *stat_task = &status_task_struct;
  92 static struct timeval initial_delay_barrier;
  93
  94 /**
  95  * the task for handling audiod commands
  96  *
  97  * \sa struct task, struct sched
  98  */
  99 struct command_task {
 100         /** the local listening socket */
 101         int fd;
 102         /** the associated task structure */
 103         struct task task;
 104 };
 105
 106 /** iterate over all supported audio formats */
 107 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 108
 109 /**
 110  * get the audio format number
 111  * \param name the name of the audio format
 112  *
 113  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 114  * \a name is not a supported audio format.
 115  */
 116 int get_audio_format_num(char *name)
 117 {
 118         int i;
 119         FOR_EACH_AUDIO_FORMAT(i)
 120                 if (!strcmp(name, audio_formats[i]))
 121                         return i;
 122         return -E_UNSUPPORTED_AUDIO_FORMAT;
 123 }
 124
 125 /**
 126  * the log function of para_audiod
 127  *
 128  * \param ll loglevel
 129  * \param fmt the format string
 130  */
 131 void para_log(int ll, const char* fmt,...)
 132 {
 133         va_list argp;
 134         FILE *outfd;
 135         struct tm *tm;
 136         time_t t1;
 137         char str[MAXLINE] = "";
 138         static char *hostname;
 139
 140         if (ll < conf.loglevel_arg)
 141                 return;
 142         if (!hostname)
 143                 hostname = para_hostname();
 144         outfd = logfile? logfile : stderr;
 145         time(&t1);
 146         tm = localtime(&t1);
 147         strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
 148         fprintf(outfd, "%s %s ", str, hostname);
 149         if (conf.loglevel_arg <= INFO)
 150                 fprintf(outfd, "%i ", ll);
 151         va_start(argp, fmt);
 152         vfprintf(outfd, fmt, argp);
 153         va_end(argp);
 154 }
 155
 156 static char *configfile_exists(void)
 157 {
 158         char *home = para_homedir();
 159         char *config_file = make_message("%s/.paraslash/audiod.conf",
 160                 home);
 161         free(home);
 162         if (file_exists(config_file))
 163                 return config_file;
 164         free(config_file);
 165         return NULL;
 166 }
 167
 168 static void setup_signal_handling(void)
 169 {
 170         sig_task->fd = para_signal_init();
 171         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 172         para_install_sighandler(SIGINT);
 173         para_install_sighandler(SIGTERM);
 174         para_install_sighandler(SIGHUP);
 175         signal(SIGPIPE, SIG_IGN);
 176 }
 177
 178 static void clear_slot(int slot_num)
 179 {
 180         struct slot_info *s = &slot[slot_num];
 181
 182         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 183         memset(s, 0, sizeof(struct slot_info));
 184         s->format = -1;
 185 }
 186
 187 static void close_receiver(int slot_num)
 188 {
 189         struct slot_info *s = &slot[slot_num];
 190         struct audio_format_info *a;
 191
 192         if (s->format < 0 || !s->receiver_node)
 193                 return;
 194         a = &afi[s->format];
 195         PARA_NOTICE_LOG("closing %s receiver in slot %d (eof = %d)\n",
 196                 audio_formats[s->format] , slot_num, s->receiver_node->eof);
 197         a->receiver->close(s->receiver_node);
 198         free(s->receiver_node);
 199         s->receiver_node = NULL;
 200 }
 201
 202 static void kill_all_decoders(void)
 203 {
 204         int i;
 205
 206         FOR_EACH_SLOT(i) {
 207                 struct slot_info *s = &slot[i];
 208                 if (s->wng && !s->wng->eof) {
 209                         PARA_INFO_LOG("unregistering writer node group in slot %d\n",
 210                                 i);
 211                         wng_unregister(s->wng);
 212                         s->wng->eof = 1;
 213                 }
 214                 if (s->fc && !s->fc->eof) {
 215                         PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
 216                         unregister_task(&s->fc->task);
 217                         s->fc->eof = 1;
 218                 }
 219                 if (s->receiver_node && !s->receiver_node->eof) {
 220                         PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
 221                         unregister_task(&s->receiver_node->task);
 222                         s->receiver_node->eof = 1;
 223                 }
 224         }
 225 }
 226
 227 static int get_empty_slot(void)
 228 {
 229         int i;
 230         struct slot_info *s;
 231
 232         FOR_EACH_SLOT(i) {
 233                 s = &slot[i];
 234                 if (s->format < 0) {
 235                         clear_slot(i);
 236                         return i;
 237                 }
 238                 if (s->wng || s->receiver_node || s->fc)
 239                         continue;
 240                 clear_slot(i);
 241                 return i;
 242         }
 243         return -E_NO_MORE_SLOTS;
 244 }
 245
 246 /**
 247  * get the number of filters
 248  *
 249  * \param audio_format_num the number identifying the audio format
 250  *
 251  * \return the number of filters for the given audio format
 252  *
 253  * \sa struct filter;
 254  */
 255 int num_filters(int audio_format_num)
 256 {
 257         return afi[audio_format_num].num_filters;
 258 }
 259
 260 static void filter_event_handler(struct task *t)
 261 {
 262         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 263         struct filter_chain *fc = t->private_data;
 264         fc->eof = 1;
 265         unregister_task(t);
 266 }
 267
 268 static void open_filters(int slot_num)
 269 {
 270         struct slot_info *s = &slot[slot_num];
 271         struct audio_format_info *a = &afi[s->format];
 272         int nf = a->num_filters;
 273         int i;
 274
 275         s->fc = NULL;
 276         if (!nf)
 277                 return;
 278         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 279         s->fc = para_calloc(sizeof(struct filter_chain));
 280         INIT_LIST_HEAD(&s->fc->filters);
 281         s->fc->inbuf = s->receiver_node->buf;
 282         s->fc->in_loaded = &s->receiver_node->loaded;
 283         s->fc->input_eof = &s->receiver_node->eof;
 284         s->fc->task.pre_select = filter_pre_select;
 285         s->fc->task.event_handler = filter_event_handler;
 286         s->fc->task.private_data = s->fc;
 287         s->fc->eof = 0;
 288
 289         s->receiver_node->output_eof = &s->fc->eof;
 290         sprintf(s->fc->task.status, "filter chain");
 291         for (i = 0; i < nf; i++) {
 292                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 293                 fn->conf = a->filter_conf[i];
 294                 fn->fc = s->fc;
 295                 fn->filter = a->filters[i];
 296                 INIT_LIST_HEAD(&fn->callbacks);
 297                 list_add_tail(&fn->node, &s->fc->filters);
 298                 fn->filter->open(fn);
 299                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 300                         audio_formats[s->format], i + 1,  nf,
 301                         fn->filter->name, slot_num);
 302                 s->fc->outbuf = fn->buf;
 303                 s->fc->out_loaded = &fn->loaded;
 304         }
 305         register_task(&s->fc->task);
 306 }
 307
 308 static void wng_event_handler(struct task *t)
 309 {
 310         struct writer_node_group *wng = t->private_data;
 311
 312         PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
 313         wng->eof = 1;
 314         wng_unregister(wng);
 315 }
 316
 317 static void open_writers(int slot_num)
 318 {
 319         int ret, i;
 320         struct slot_info *s = &slot[slot_num];
 321         struct audio_format_info *a = &afi[s->format];
 322
 323         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 324         if (!a->num_writers)
 325                 s->wng = setup_default_wng();
 326         else
 327                 s->wng = wng_new(a->num_writers);
 328         if (s->fc) {
 329                 s->wng->buf = s->fc->outbuf;
 330                 s->wng->loaded = s->fc->out_loaded;
 331                 s->wng->input_eof = &s->fc->eof;
 332                 s->wng->channels = &s->fc->channels;
 333                 s->wng->samplerate = &s->fc->samplerate;
 334                 s->fc->output_eof = &s->wng->eof;
 335                 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
 336         } else {
 337                 s->wng->buf = s->receiver_node->buf;
 338                 s->wng->loaded = &s->receiver_node->loaded;
 339                 s->wng->input_eof = &s->receiver_node->eof;
 340         }
 341         s->wng->task.event_handler = wng_event_handler;
 342         for (i = 0; i < a->num_writers; i++) {
 343                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 344                 s->wng->writer_nodes[i].writer = a->writers[i];
 345         }
 346         ret = wng_open(s->wng);
 347         if (ret < 0) {
 348                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 349                 return;
 350         }
 351         s->wstime = *now;
 352         activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
 353 }
 354
 355 static void rn_event_handler(struct task *t)
 356 {
 357         struct receiver_node *rn = t->private_data;
 358         const struct timeval restart_delay = {0, 10 * 1000};
 359         int i;
 360
 361         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 362         unregister_task(t);
 363         rn->eof = 1;
 364         /* set restart barrier */
 365         FOR_EACH_SLOT(i) {
 366                 if (slot[i].receiver_node != rn)
 367                         continue;
 368                 tv_add(now, &restart_delay, &afi[slot[i].format].restart_barrier);
 369         }
 370 }
 371
 372 static int open_receiver(int format)
 373 {
 374         struct audio_format_info *a = &afi[format];
 375         struct slot_info *s;
 376         int ret, slot_num;
 377         struct receiver_node *rn;
 378         const struct timeval restart_delay = {1, 0};
 379
 380         ret = get_empty_slot();
 381         if (ret < 0)
 382                 goto err;
 383         slot_num = ret;
 384         s = &slot[slot_num];
 385         s->format = format;
 386         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 387         rn = s->receiver_node;
 388         rn->receiver = a->receiver;
 389         rn->conf = a->receiver_conf;
 390         ret = a->receiver->open(s->receiver_node);
 391         if (ret < 0) {
 392                 free(s->receiver_node);
 393                 s->receiver_node = NULL;
 394                 goto err;
 395         }
 396         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 397                 audio_formats[s->format], a->receiver->name, slot_num);
 398         rn->task.private_data = s->receiver_node;
 399         rn->task.pre_select = a->receiver->pre_select;
 400         rn->task.post_select = a->receiver->post_select;
 401         rn->task.event_handler = rn_event_handler;
 402         sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
 403         register_task(&rn->task);
 404         return 1;
 405 err:
 406         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 407         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 408         return ret;
 409 }
 410
 411 static int receiver_running(int format)
 412 {
 413         int i;
 414
 415         FOR_EACH_SLOT(i) {
 416                 struct slot_info *s = &slot[i];
 417                 if (s->format == format && s->receiver_node
 418                                 && !s->receiver_node->eof)
 419                         return 1;
 420         }
 421         return 0;
 422 }
 423
 424 static int open_current_receiver(struct sched *s)
 425 {
 426         int i;
 427         struct timeval diff;
 428         char *audio_format = stat_task->stat_item_values[SI_FORMAT];
 429
 430         if (!audio_format || !stat_task->pcd)
 431                 return 0;
 432         i = get_audio_format_num(audio_format + strlen(
 433                 status_item_list[SI_FORMAT]) + 1);
 434         if (i < 0)
 435                 return 0;
 436         if (receiver_running(i))
 437                 return 0;
 438         if (tv_diff(now, &afi[i].restart_barrier, &diff) < 0) {
 439                 s->timeout = diff;
 440                 return 0;
 441         }
 442         return open_receiver(i) < 0? 0 : 1;
 443 }
 444
 445 static unsigned compute_time_diff(const struct timeval *status_time)
 446 {
 447         struct timeval tmp, diff;
 448         static unsigned count;
 449         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 450         const struct timeval max_deviation = {0, 500 * 1000};
 451         const int time_smooth = 5;
 452
 453         if (!status_time)
 454                 return count;
 455         sign = tv_diff(status_time, now, &diff);
 456 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 457 //                      sign, sa_time_diff_sign);
 458         if (!count) {
 459                 sa_time_diff_sign = sign;
 460                 stat_task->sa_time_diff = diff;
 461                 count++;
 462                 goto out;
 463         }
 464         if (count > 5) {
 465                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 466                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 467                         PARA_WARNING_LOG("time diff jump: %lims\n",
 468                                 s * tv2ms(&tmp));
 469         }
 470         count++;
 471         sa_time_diff_sign = tv_convex_combination(
 472                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 473                 count > 10? sign : sign * time_smooth, &diff,
 474                 &tmp);
 475         stat_task->sa_time_diff = tmp;
 476         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 477                 sign > 0? "+" : "-",
 478                 tv2ms(&diff),
 479                 sa_time_diff_sign ? "+" : "-",
 480                 tv2ms(&stat_task->sa_time_diff)
 481         );
 482 out:
 483         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 484         return count;
 485 }
 486
 487 static int check_stat_line(char *line, __a_unused void *data)
 488 {
 489         int itemnum;
 490         size_t ilen = 0;
 491         long unsigned sec, usec;
 492         char *tmp;
 493
 494 //      PARA_INFO_LOG("line: %s\n", line);
 495         if (!line)
 496                 return 1;
 497         itemnum = stat_line_valid(line);
 498         if (itemnum < 0) {
 499                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 500                 return 1;
 501         }
 502         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 503                 return 1;
 504         tmp = make_message("%s\n", line);
 505         stat_client_write(tmp, itemnum);
 506         free(tmp);
 507         free(stat_task->stat_item_values[itemnum]);
 508         stat_task->stat_item_values[itemnum] = para_strdup(line);
 509         ilen = strlen(status_item_list[itemnum]);
 510         switch (itemnum) {
 511         case SI_STATUS:
 512                 stat_task->playing = strstr(line, "playing")? 1 : 0;
 513                 break;
 514         case SI_OFFSET:
 515                 stat_task->offset_seconds = atoi(line + ilen + 1);
 516                 break;
 517         case SI_LENGTH:
 518                 stat_task->length_seconds = atoi(line + ilen + 1);
 519                 break;
 520         case SI_STREAM_START:
 521                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 522                         struct timeval a_start, delay;
 523                         delay.tv_sec = conf.stream_delay_arg / 1000;
 524                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 525                         stat_task->server_stream_start.tv_sec = sec;
 526                         stat_task->server_stream_start.tv_usec = usec;
 527                         if (compute_time_diff(NULL) > 2) {
 528                                 if (stat_task->sa_time_diff_sign < 0)
 529                                         tv_add(&stat_task->server_stream_start,
 530                                                 &stat_task->sa_time_diff, &a_start);
 531                                 else
 532                                         tv_diff(&stat_task->server_stream_start,
 533                                                 &stat_task->sa_time_diff, &a_start);
 534                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 535                         }
 536                 }
 537                 break;
 538         case SI_CURRENT_TIME:
 539                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 540                         struct timeval tv = {sec, usec};
 541                         compute_time_diff(&tv);
 542                 }
 543                 if (stat_task->clock_diff_count)
 544                         stat_task->clock_diff_count--;
 545                 break;
 546         }
 547         return 1;
 548 }
 549
 550 static void try_to_close_slot(int slot_num)
 551 {
 552         struct slot_info *s = &slot[slot_num];
 553
 554         if (s->format < 0)
 555                 return;
 556         if (s->receiver_node && !s->receiver_node->eof)
 557                 return;
 558         if (s->fc && !s->fc->eof)
 559                 return;
 560         if (s->wng && !s->wng->eof)
 561                 return;
 562         PARA_INFO_LOG("closing slot %d \n", slot_num);
 563         wng_close(s->wng);
 564         close_filters(s->fc);
 565         free(s->fc);
 566         close_receiver(slot_num);
 567         clear_slot(slot_num);
 568 }
 569
 570 /*
 571  * Check if any receivers/filters/writers need to be started and do so if
 572  * neccessary.  Since the pre_select function didn't have a chance yet to put
 573  * file descriptors into the fd sets given by s, make the upcoming select()
 574  * return immediately to avoid a long timeout in case we started something.
 575  */
 576 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
 577 {
 578         int i;
 579         struct timeval min_delay = {0, 1};
 580
 581         t->ret = 1;
 582         if (audiod_status != AUDIOD_ON || !stat_task->playing)
 583                 return kill_all_decoders();
 584         if (open_current_receiver(s))
 585                 s->timeout = min_delay;
 586         FOR_EACH_SLOT(i) {
 587                 struct slot_info *sl = &slot[i];
 588                 struct audio_format_info *a;
 589                 struct timeval diff;
 590
 591                 if (sl->format < 0)
 592                         continue;
 593                 a = &afi[sl->format];
 594                 if (!sl->receiver_node)
 595                         continue;
 596                 if (!a->num_filters) {
 597                         if (sl->receiver_node->loaded && !sl->wng) {
 598                                 open_writers(i);
 599                                 s->timeout = min_delay;
 600                         }
 601                         continue;
 602                 }
 603                 if (sl->receiver_node->loaded && !sl->fc) {
 604                         open_filters(i);
 605                         s->timeout = min_delay;
 606                         continue;
 607                 }
 608                 if (!sl->fc || !*sl->fc->out_loaded || sl->wng)
 609                         continue;
 610                 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
 611                         open_writers(i);
 612                         s->timeout = min_delay;
 613                         continue;
 614                 }
 615                 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
 616                 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
 617                         s->timeout = diff;
 618                 }
 619         }
 620 }
 621
 622 static void audiod_post_select(__a_unused struct sched *s,
 623         __a_unused struct task *t)
 624 {
 625         int i;
 626
 627         t->ret = 1;
 628         FOR_EACH_SLOT(i)
 629                 try_to_close_slot(i);
 630 }
 631
 632 static void init_audiod_task(struct task *t)
 633 {
 634         t->pre_select = audiod_pre_select;
 635         t->post_select = audiod_post_select;
 636         t->event_handler = NULL;
 637         t->private_data = t;
 638         sprintf(t->status, "audiod task");
 639 }
 640
 641 static int parse_stream_command(const char *txt, char **cmd)
 642 {
 643         char *p = strchr(txt, ':');
 644         int i;
 645
 646         if (!p)
 647                 return -E_MISSING_COLON;
 648         p++;
 649         FOR_EACH_AUDIO_FORMAT(i) {
 650                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 651                         continue;
 652                 *cmd = p;
 653                 return i;
 654         }
 655         return -E_UNSUPPORTED_AUDIO_FORMAT;
 656 }
 657
 658 static int add_filter(int format, char *cmdline)
 659 {
 660         struct audio_format_info *a = &afi[format];
 661         int filter_num, nf = a->num_filters;
 662
 663         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 664         if (filter_num < 0)
 665                 return filter_num;
 666         a->filters[nf] = &filters[filter_num];
 667         a->num_filters++;
 668         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
 669                 a->filters[nf]->name);
 670         return filter_num;
 671 }
 672
 673 static int init_writers(void)
 674 {
 675         int i, ret, nw;
 676         char *cmd;
 677         struct audio_format_info *a;
 678
 679         init_supported_writers();
 680         nw = PARA_MAX(1, conf.writer_given);
 681         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 682         FOR_EACH_AUDIO_FORMAT(i) {
 683                 a = &afi[i];
 684                 a->writer_conf = para_malloc(nw * sizeof(void *));
 685                 a->writers = para_malloc(nw * sizeof(struct writer *));
 686                 a->num_writers = 0;
 687         }
 688         for (i = 0; i < conf.writer_given; i++) {
 689                 void *wconf;
 690                 int writer_num;
 691                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 692                 if (ret < 0)
 693                         goto out;
 694                 a = &afi[ret];
 695                 nw = a->num_writers;
 696                 wconf = check_writer_arg(cmd, &writer_num);
 697                 if (!wconf) {
 698                         ret = writer_num;
 699                         goto out;
 700                 }
 701                 a->writers[nw] = &writers[writer_num];
 702                 a->writer_conf[nw] = wconf;
 703                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 704                         nw, writer_names[writer_num]);
 705                 a->num_writers++;
 706         }
 707         ret = 1;
 708 out:
 709         return ret;
 710 }
 711
 712 static int init_receivers(void)
 713 {
 714         int i, ret, receiver_num;
 715         char *cmd = NULL;
 716         struct audio_format_info *a;
 717
 718         for (i = 0; receivers[i].name; i++) {
 719                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
 720                 receivers[i].init(&receivers[i]);
 721         }
 722         for (i = conf.receiver_given - 1; i >= 0; i--) {
 723                 char *arg = conf.receiver_arg[i];
 724                 char *recv_arg = strchr(arg, ':');
 725                 ret = -E_MISSING_COLON;
 726                 if (!recv_arg)
 727                         goto out;
 728                 *recv_arg = '\0';
 729                 recv_arg++;
 730                 ret = get_audio_format_num(arg);
 731                 if (ret < 0)
 732                         goto out;
 733                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 734                 if (!afi[ret].receiver_conf) {
 735                         ret = -E_RECV_SYNTAX;
 736                         goto out;
 737                 }
 738                 afi[ret].receiver = &receivers[receiver_num];
 739         }
 740         /* use the first available receiver with no arguments
 741          * for those audio formats for which no receiver
 742          * was specified
 743          */
 744         cmd = para_strdup(receivers[0].name);
 745         FOR_EACH_AUDIO_FORMAT(i) {
 746                 a = &afi[i];
 747                 if (a->receiver_conf)
 748                         continue;
 749                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 750                 if (!a->receiver_conf)
 751                         return -E_RECV_SYNTAX;
 752                 a->receiver = &receivers[receiver_num];
 753         }
 754         ret = 1;
 755 out:
 756         free(cmd);
 757         return ret;
 758 }
 759
 760 static int init_default_filters(void)
 761 {
 762         int i, ret = 1;
 763
 764         FOR_EACH_AUDIO_FORMAT(i) {
 765                 struct audio_format_info *a = &afi[i];
 766                 char *tmp;
 767                 int j;
 768
 769                 if (a->num_filters)
 770                         continue; /* no default -- nothing to to */
 771                 /* add "dec" to audio format name */
 772                 tmp = make_message("%sdec", audio_formats[i]);
 773                 for (j = 0; filters[j].name; j++)
 774                         if (!strcmp(tmp, filters[j].name))
 775                                 break;
 776                 free(tmp);
 777                 ret = -E_UNSUPPORTED_FILTER;
 778                 if (!filters[j].name)
 779                         goto out;
 780                 tmp = para_strdup(filters[j].name);
 781                 ret = add_filter(i, tmp);
 782                 free(tmp);
 783                 if (ret < 0)
 784                         goto out;
 785                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 786                         filters[j].name);
 787         }
 788 out:
 789         return ret;
 790 }
 791
 792 static int init_filters(void)
 793 {
 794         int i, ret, nf;
 795
 796         filter_init(filters);
 797         nf = PARA_MAX(1,  conf.filter_given);
 798         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 799         FOR_EACH_AUDIO_FORMAT(i) {
 800                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 801                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
 802         }
 803         if (!conf.no_default_filters_given)
 804                 return init_default_filters();
 805         for (i = 0; i < conf.filter_given; i++) {
 806                 char *arg = conf.filter_arg[i];
 807                 char *filter_name = strchr(arg, ':');
 808                 ret = -E_MISSING_COLON;
 809                 if (!filter_name)
 810                         goto out;
 811                 *filter_name = '\0';
 812                 filter_name++;
 813                 ret = get_audio_format_num(arg);
 814                 if (ret < 0)
 815                         goto out;
 816                 ret = add_filter(ret, filter_name);
 817                 if (ret < 0)
 818                         goto out;
 819         }
 820         ret = init_default_filters(); /* use default values for the rest */
 821 out:
 822         return ret;
 823 }
 824
 825 static int init_stream_io(void)
 826 {
 827         int ret;
 828
 829         ret = init_writers();
 830         if (ret < 0)
 831                 return ret;
 832         ret = init_receivers();
 833         if (ret < 0)
 834                 return ret;
 835         ret = init_filters();
 836         if (ret < 0)
 837                 return ret;
 838         return 1;
 839 }
 840
 841 static int audiod_get_socket(void)
 842 {
 843         struct sockaddr_un unix_addr;
 844         int fd;
 845
 846         if (conf.socket_given)
 847                 socket_name = para_strdup(conf.socket_arg);
 848         else {
 849                 char *hn = para_hostname();
 850                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 851                         hn);
 852                 free(hn);
 853         }
 854         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 855         if (conf.force_given)
 856                 unlink(socket_name);
 857         fd = create_local_socket(socket_name, &unix_addr,
 858                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 859         if (fd < 0) {
 860                 PARA_EMERG_LOG("can not connect to socket\n");
 861                 exit(EXIT_FAILURE); /* do not unlink socket */
 862         }
 863         if (listen(fd , 5) < 0) {
 864                 PARA_EMERG_LOG("can not listen on socket\n");
 865                 exit(EXIT_FAILURE); /* do not unlink socket */
 866         }
 867         mark_fd_nonblock(fd);
 868         return fd;
 869 }
 870
 871 static void signal_event_handler(struct task *t)
 872 {
 873         struct signal_task *st = t->private_data;
 874
 875         switch (st->signum) {
 876         case SIGINT:
 877         case SIGTERM:
 878         case SIGHUP:
 879                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 880                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 881         }
 882 }
 883
 884 static void signal_pre_select(struct sched *s, struct task *t)
 885 {
 886         struct signal_task *st = t->private_data;
 887         t->ret = 1;
 888         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 889 }
 890
 891 static void signal_post_select(struct sched *s, struct task *t)
 892 {
 893         struct signal_task *st = t->private_data;
 894         t->ret = 1;
 895         if (!FD_ISSET(st->fd, &s->rfds))
 896                 return;
 897         t->ret = -E_SIGNAL_CAUGHT;
 898         st->signum = para_next_signal();
 899 }
 900
 901 static void signal_setup_default(struct signal_task *st)
 902 {
 903         st->task.pre_select = signal_pre_select;
 904         st->task.post_select = signal_post_select;
 905         st->task.private_data = st;
 906         sprintf(st->task.status, "signal task");
 907 }
 908
 909 static void command_pre_select(struct sched *s, struct task *t)
 910 {
 911         struct command_task *ct = t->private_data;
 912         t->ret = 1;
 913         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 914
 915 }
 916
 917 static void command_post_select(struct sched *s, struct task *t)
 918 {
 919         int ret;
 920         struct command_task *ct = t->private_data;
 921
 922         t->ret = 1; /* always successful */
 923         audiod_status_dump();
 924         if (!FD_ISSET(ct->fd, &s->rfds))
 925                 return;
 926         ret = handle_connect(ct->fd);
 927         if (ret < 0)
 928                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 929 }
 930
 931 static void init_command_task(struct command_task *ct)
 932 {
 933         ct->task.pre_select = command_pre_select;
 934         ct->task.post_select = command_post_select;
 935         ct->task.event_handler = NULL;
 936         ct->task.private_data = ct;
 937         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 938         sprintf(ct->task.status, "command task");
 939 }
 940
 941 static void close_stat_pipe(void)
 942 {
 943         int i;
 944
 945         if (!stat_task->pcd)
 946                 return;
 947         client_close(stat_task->pcd);
 948         stat_task->pcd = NULL;
 949         for (i = 0; i < NUM_STAT_ITEMS; i++) {
 950                 free(stat_task->stat_item_values[i]);
 951                 stat_task->stat_item_values[i] = NULL;
 952         }
 953         dump_empty_status();
 954         stat_task->length_seconds = 0;
 955         stat_task->offset_seconds = 0;
 956         audiod_status_dump();
 957         stat_task->playing = 0;
 958         stat_task->stat_item_values[SI_STATUS_BAR] = make_message(
 959                 "%s:no connection to para_server\n",
 960                 status_item_list[SI_STATUS_BAR]);
 961         stat_client_write(stat_task->stat_item_values[SI_STATUS_BAR],
 962                 SI_STATUS_BAR);
 963         if (stat_task->clock_diff_count) {
 964                 stat_task->clock_diff_barrier.tv_sec = now->tv_sec + 1;
 965                 stat_task->clock_diff_barrier.tv_usec = now->tv_usec;
 966         }
 967 }
 968
 969 /**
 970  * close the connection to para_server and exit
 971  *
 972  * \param status the exit status which is passed to exit(3)
 973  * \param msg the log message
 974  *
 975  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
 976  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
 977  * EXIT_FAILURE.
 978  *
 979  * \sa exit(3)
 980  */
 981 void __noreturn clean_exit(int status, const char *msg)
 982 {
 983         PARA_EMERG_LOG("%s\n", msg);
 984         if (socket_name)
 985                 unlink(socket_name);
 986         close_stat_pipe();
 987         exit(status);
 988 }
 989
 990 /* avoid busy loop if server is down */
 991 static void set_stat_task_restart_barrier(void)
 992 {
 993         struct timeval delay = {5, 0};
 994         tv_add(now, &delay, &stat_task->restart_barrier);
 995 }
 996
 997 static void client_task_event_handler(__a_unused struct task *t)
 998 {
 999         int i;
1000
1001         if (t->ret == -E_HANDSHAKE_COMPLETE)
1002                 return;
1003         unregister_task(t);
1004         close_stat_pipe();
1005         if (t->ret != -E_SERVER_EOF)
1006                 stat_task->clock_diff_count = conf.clock_diff_count_arg;
1007         set_stat_task_restart_barrier();
1008         FOR_EACH_AUDIO_FORMAT(i)
1009                 afi[i].restart_barrier = stat_task->restart_barrier;
1010 }
1011
1012 static void status_pre_select(struct sched *s, struct task *t)
1013 {
1014         struct status_task *st = t->private_data;
1015         int ret;
1016
1017         t->ret = 1; /* always successful */
1018         if (st->pcd || audiod_status == AUDIOD_OFF)
1019                 return;
1020         if (!st->clock_diff_count && tv_diff(now, &st->restart_barrier, NULL)
1021                         < 0)
1022                 return;
1023         if (st->clock_diff_count) {
1024                 char *argv[] = {"audiod", "stat", "1", NULL};
1025                 int argc = 3;
1026                 if (tv_diff(now, &st->clock_diff_barrier, NULL) < 0)
1027                         return;
1028                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1029                 ret = client_open(argc, argv, &st->pcd);
1030
1031         } else {
1032                 char *argv[] = {"audiod", "stat", NULL};
1033                 int argc = 2;
1034                 ret = client_open(argc, argv, &st->pcd);
1035         }
1036         set_stat_task_restart_barrier();
1037         if (ret < 0)
1038                 return;
1039         st->pcd->task.event_handler = client_task_event_handler;
1040         s->timeout.tv_sec = 0;
1041         s->timeout.tv_usec = 1;
1042 }
1043
1044 static void status_post_select(__a_unused struct sched *s, struct task *t)
1045 {
1046         struct status_task *st = t->private_data;
1047         unsigned bytes_left;
1048
1049         t->ret = 1;
1050         if (!st->pcd || st->pcd->status != CL_RECEIVING)
1051                 return;
1052         if (st->pcd && audiod_status == AUDIOD_OFF) {
1053                 unregister_task(&st->pcd->task);
1054                 close_stat_pipe();
1055                 st->clock_diff_count = conf.clock_diff_count_arg;
1056                 return;
1057         }
1058         bytes_left = for_each_line(st->pcd->buf, st->pcd->loaded,
1059                 &check_stat_line, NULL);
1060         if (st->pcd->loaded != bytes_left) {
1061                 st->last_status_read = *now;
1062                 st->pcd->loaded = bytes_left;
1063         } else {
1064                 struct timeval diff;
1065                 tv_diff(now, &st->last_status_read, &diff);
1066                 if (diff.tv_sec > 61)
1067                         close_stat_pipe();
1068         }
1069 }
1070
1071 static void init_status_task(struct status_task *st)
1072 {
1073         memset(st, 0, sizeof(struct status_task));
1074         st->task.pre_select = status_pre_select;
1075         st->task.post_select = status_post_select;
1076         st->task.private_data = st;
1077         st->sa_time_diff_sign = 1;
1078         st->clock_diff_count = conf.clock_diff_count_arg;
1079         sprintf(st->task.status, "status task");
1080 }
1081
1082 static void set_initial_status(void)
1083 {
1084         audiod_status = AUDIOD_ON;
1085         if (!conf.mode_given)
1086                 return;
1087         if (!strcmp(conf.mode_arg, "sb")) {
1088                 audiod_status = AUDIOD_STANDBY;
1089                 return;
1090         }
1091         if (!strcmp(conf.mode_arg, "off")) {
1092                 audiod_status = AUDIOD_OFF;
1093                 return;
1094         }
1095         if (strcmp(conf.mode_arg, "on"))
1096                 PARA_WARNING_LOG("%s", "invalid mode\n");
1097 }
1098
1099 /**
1100  * the main function of para_audiod
1101  *
1102  * \param argc usual argument count
1103  * \param argv usual argument vector
1104  *
1105  * \return EXIT_SUCCESS or EXIT_FAILURE
1106  *
1107  * \sa para_audiod(1)
1108  * */
1109 int main(int argc, char *argv[])
1110 {
1111         char *config_file;
1112         int ret, i;
1113         struct sched s;
1114         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1115         struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1116
1117         valid_fd_012();
1118         audiod_cmdline_parser(argc, argv, &conf);
1119         HANDLE_VERSION_FLAG("audiod", conf);
1120         para_drop_privileges(conf.user_arg, conf.group_arg);
1121         config_file = configfile_exists();
1122         if (config_file) {
1123                 struct audiod_cmdline_parser_params params = {
1124                         .override = 0,
1125                         .initialize = 0,
1126                         .check_required = 0,
1127                         .check_ambiguity = 0
1128
1129                 };
1130                 if (audiod_cmdline_parser_config_file(config_file, &conf, &params)) {
1131                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1132                         exit(EXIT_FAILURE);
1133                 }
1134                 free(config_file);
1135         }
1136         if (conf.logfile_given)
1137                 logfile = open_log(conf.logfile_arg);
1138         log_welcome("para_audiod", conf.loglevel_arg);
1139         i = init_stream_io();
1140         if (i < 0) {
1141                 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1142                 exit(EXIT_FAILURE);
1143         }
1144         server_uptime(UPTIME_SET);
1145         set_initial_status();
1146         FOR_EACH_SLOT(i)
1147                 clear_slot(i);
1148         init_grabbing();
1149         setup_signal_handling();
1150         signal_setup_default(sig_task);
1151         sig_task->task.event_handler = signal_event_handler;
1152
1153         init_status_task(stat_task);
1154         init_command_task(cmd_task);
1155         init_audiod_task(audiod_task);
1156
1157         if (conf.daemon_given)
1158                 daemon_init();
1159
1160         register_task(&sig_task->task);
1161         register_task(&cmd_task->task);
1162         register_task(&stat_task->task);
1163         register_task(audiod_task);
1164         s.default_timeout.tv_sec = 0;
1165         s.default_timeout.tv_usec = 99 * 1000;
1166         ret = sched(&s);
1167
1168         PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1169         return EXIT_FAILURE;
1170 }