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