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 #include <signal.h>
  11
  12 #include "para.h"
  13 #include "error.h"
  14 #include "audiod.cmdline.h"
  15 #include "list.h"
  16 #include "sched.h"
  17 #include "recv.h"
  18 #include "ggo.h"
  19 #include "filter.h"
  20 #include "grab_client.cmdline.h"
  21 #include "grab_client.h"
  22 #include "client.cmdline.h"
  23 #include "client.h"
  24 #include "audiod.h"
  25 #include "net.h"
  26 #include "daemon.h"
  27 #include "string.h"
  28 #include "fd.h"
  29 #include "write.h"
  30 #include "write_common.h"
  31 #include "signal.h"
  32
  33 /** define the array of error lists needed by para_audiod */
  34 INIT_AUDIOD_ERRLISTS;
  35 /** define the array containing all supported audio formats */
  36 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
  37
  38 /** Defines how audiod handles one supported audio format. */
  39 struct audio_format_info {
  40         /** pointer to the receiver for this audio format */
  41         struct receiver *receiver;
  42         /** the receiver configuration */
  43         void *receiver_conf;
  44         /** the number of filters that should be activated for this audio format */
  45         unsigned int num_filters;
  46         /** Array of filter numbers to be activated. */
  47         unsigned *filter_nums;
  48         /** Pointer to the array of filter configurations. */
  49         void **filter_conf;
  50         /** the number of filters that should be activated for this audio format */
  51         unsigned int num_writers;
  52         /** pointer to the array of writers to be activated */
  53         struct writer **writers;
  54         /** pointer to the array of writer configurations */
  55         void **writer_conf;
  56         /** do not start receiver/filters/writer before this time */
  57         struct timeval restart_barrier;
  58 };
  59
  60 /**
  61  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  62  * be associated with a receiver/filter/writer triple. This array holds all
  63  * information on the status of these slots.
  64  *
  65  * \sa struct slot_info
  66  * */
  67 struct slot_info slot[MAX_STREAM_SLOTS];
  68
  69
  70 /** The array of status items sent by para_server. */
  71 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
  72
  73 /**
  74  * the current mode of operation of which can be changed by the on/off/cycle
  75  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
  76  */
  77 int audiod_status = AUDIOD_ON;
  78
  79 /**
  80  * the gengetopt args_info struct that holds information on all command line
  81  * arguments
  82  */
  83 struct audiod_args_info conf;
  84
  85 static char *socket_name;
  86 static FILE *logfile;
  87 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
  88
  89 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
  90
  91 static struct status_task status_task_struct;
  92
  93 /**
  94  * the task that calls the status command of para_server
  95  *
  96  * \sa struct status_task
  97  */
  98 static struct status_task *stat_task = &status_task_struct;
  99 static struct timeval initial_delay_barrier;
 100
 101 /**
 102  * the task for handling audiod commands
 103  *
 104  * \sa struct task, struct sched
 105  */
 106 struct command_task {
 107         /** the local listening socket */
 108         int fd;
 109         /** the associated task structure */
 110         struct task task;
 111 };
 112
 113 /** iterate over all supported audio formats */
 114 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 115
 116 /**
 117  * get the audio format number
 118  * \param name the name of the audio format
 119  *
 120  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 121  * \a name is not a supported audio format.
 122  */
 123 int get_audio_format_num(char *name)
 124 {
 125         int i;
 126
 127         while (para_isspace(*name))
 128                 name++;
 129         FOR_EACH_AUDIO_FORMAT(i)
 130                 if (!strcmp(name, audio_formats[i]))
 131                         return i;
 132         return -E_UNSUPPORTED_AUDIO_FORMAT;
 133 }
 134
 135 char *get_time_string(struct timeval *newest_stime)
 136 {
 137         struct timeval diff, adj_stream_start, tmp;
 138         int total = 0, use_server_time = 1,
 139                 length_seconds = stat_task->length_seconds;
 140
 141         if (!stat_task->playing) {
 142                 if (length_seconds)
 143                         return NULL;
 144                 return make_message("%s:\n", status_item_list[SI_PLAY_TIME]);
 145         }
 146         if (audiod_status == AUDIOD_OFF)
 147                 goto out;
 148         if (stat_task->sa_time_diff_sign > 0)
 149                 tv_diff(&stat_task->server_stream_start, &stat_task->sa_time_diff,
 150                         &adj_stream_start);
 151         else
 152                 tv_add(&stat_task->server_stream_start, &stat_task->sa_time_diff,
 153                         &adj_stream_start);
 154         tmp = adj_stream_start;
 155         if (newest_stime && audiod_status == AUDIOD_ON) {
 156                 tv_diff(newest_stime, &adj_stream_start, &diff);
 157                 if (tv2ms(&diff) < 5000) {
 158                         tmp = *newest_stime;
 159                         use_server_time = 0;
 160                 }
 161         }
 162         tv_diff(now, &tmp, &diff);
 163         total = diff.tv_sec + stat_task->offset_seconds;
 164         if (total > length_seconds)
 165                 total = length_seconds;
 166         if (total < 0)
 167                 total = 0;
 168 out:
 169         return make_message(
 170                 "%s: %s%d:%02d [%d:%02d] (%d%%/%d:%02d)\n",
 171                 status_item_list[SI_PLAY_TIME],
 172                 use_server_time? "~" : "",
 173                 total / 60,
 174                 total % 60,
 175                 (length_seconds - total) / 60,
 176                 (length_seconds - total) % 60,
 177                 length_seconds? (total * 100 + length_seconds / 2) /
 178                         length_seconds : 0,
 179                 length_seconds / 60,
 180                 length_seconds % 60
 181         );
 182 }
 183
 184 /**
 185  * the log function of para_audiod
 186  *
 187  * \param ll loglevel
 188  * \param fmt the format string
 189  */
 190 __printf_2_3 void para_log(int ll, const char* fmt,...)
 191 {
 192         va_list argp;
 193         FILE *outfd;
 194         struct tm *tm;
 195         time_t t1;
 196         char str[MAXLINE] = "";
 197         static char *hostname;
 198
 199         if (ll < conf.loglevel_arg)
 200                 return;
 201         if (!logfile && conf.daemon_given)
 202                 return;
 203         if (!hostname)
 204                 hostname = para_hostname();
 205         outfd = logfile? logfile : stderr;
 206         time(&t1);
 207         tm = localtime(&t1);
 208         strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
 209         fprintf(outfd, "%s %s ", str, hostname);
 210         if (conf.loglevel_arg <= INFO)
 211                 fprintf(outfd, "%i ", ll);
 212         va_start(argp, fmt);
 213         vfprintf(outfd, fmt, argp);
 214         va_end(argp);
 215 }
 216
 217 static char *configfile_exists(void)
 218 {
 219         char *home = para_homedir();
 220         char *config_file = make_message("%s/.paraslash/audiod.conf",
 221                 home);
 222         free(home);
 223         if (file_exists(config_file))
 224                 return config_file;
 225         free(config_file);
 226         return NULL;
 227 }
 228
 229 static void setup_signal_handling(void)
 230 {
 231         sig_task->fd = para_signal_init();
 232         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 233         para_install_sighandler(SIGINT);
 234         para_install_sighandler(SIGTERM);
 235         para_install_sighandler(SIGHUP);
 236         signal(SIGPIPE, SIG_IGN);
 237 }
 238
 239 static void clear_slot(int slot_num)
 240 {
 241         struct slot_info *s = &slot[slot_num];
 242
 243         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 244         memset(s, 0, sizeof(struct slot_info));
 245         s->format = -1;
 246 }
 247
 248 static void close_receiver(int slot_num)
 249 {
 250         struct slot_info *s = &slot[slot_num];
 251         struct audio_format_info *a;
 252
 253         if (s->format < 0 || !s->receiver_node)
 254                 return;
 255         a = &afi[s->format];
 256         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 257                 audio_formats[s->format], slot_num);
 258         a->receiver->close(s->receiver_node);
 259         free(s->receiver_node);
 260         s->receiver_node = NULL;
 261 }
 262
 263 static void kill_all_decoders(int error)
 264 {
 265         int i;
 266
 267         FOR_EACH_SLOT(i) {
 268                 struct slot_info *s = &slot[i];
 269                 if (s->wng && s->wng->task.error >= 0) {
 270                         PARA_INFO_LOG("deactivating wng in slot %d\n",
 271                                 i);
 272                         s->wng->task.error = error;
 273                 }
 274                 if (s->fc && s->fc->task.error >= 0) {
 275                         PARA_INFO_LOG("deactivatimg filter chain in slot %d\n", i);
 276                         s->fc->task.error = error;
 277                 }
 278                 if (s->receiver_node && s->receiver_node->task.error >= 0) {
 279                         PARA_INFO_LOG("deactivating receiver_node in slot %d\n", i);
 280                         s->receiver_node->task.error = error;
 281                 }
 282         }
 283 }
 284
 285 static int get_empty_slot(void)
 286 {
 287         int i;
 288         struct slot_info *s;
 289
 290         FOR_EACH_SLOT(i) {
 291                 s = &slot[i];
 292                 if (s->format < 0) {
 293                         clear_slot(i);
 294                         return i;
 295                 }
 296                 if (s->wng || s->receiver_node || s->fc)
 297                         continue;
 298                 clear_slot(i);
 299                 return i;
 300         }
 301         return -E_NO_MORE_SLOTS;
 302 }
 303
 304 /**
 305  * get the number of filters
 306  *
 307  * \param audio_format_num the number identifying the audio format
 308  *
 309  * \return the number of filters for the given audio format
 310  *
 311  * \sa struct filter;
 312  */
 313 int num_filters(int audio_format_num)
 314 {
 315         return afi[audio_format_num].num_filters;
 316 }
 317
 318 static void open_filters(int slot_num)
 319 {
 320         struct slot_info *s = &slot[slot_num];
 321         struct audio_format_info *a = &afi[s->format];
 322         struct filter_node *fn;
 323         int nf = a->num_filters;
 324         int i;
 325
 326         s->fc = NULL;
 327         if (!nf)
 328                 return;
 329         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 330         s->fc = para_calloc(sizeof(struct filter_chain));
 331         s->fc->filter_nodes = para_malloc(nf * sizeof(struct filter_node));
 332         s->fc->inbuf = s->receiver_node->buf;
 333         s->fc->in_loaded = &s->receiver_node->loaded;
 334         s->fc->input_error = &s->receiver_node->task.error;
 335         s->fc->task.pre_select = filter_pre_select;
 336         s->fc->task.post_select = NULL;
 337         s->fc->task.error = 0;
 338         s->fc->num_filters = nf;
 339
 340         s->receiver_node->output_error = &s->fc->task.error;
 341         sprintf(s->fc->task.status, "filter chain");
 342         FOR_EACH_FILTER_NODE(fn, s->fc, i) {
 343                 struct filter *f = filters + a->filter_nums[i];
 344                 fn->filter_num = a->filter_nums[i];
 345                 fn->conf = a->filter_conf[i];
 346                 fn->fc = s->fc;
 347                 fn->loaded = 0;
 348                 INIT_LIST_HEAD(&fn->callbacks);
 349                 f->open(fn);
 350                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 351                         audio_formats[s->format], i,  nf, f->name, slot_num);
 352                 s->fc->outbuf = fn->buf;
 353                 s->fc->out_loaded = &fn->loaded;
 354         }
 355         register_task(&s->fc->task);
 356 }
 357
 358 static void open_writers(int slot_num)
 359 {
 360         int ret, i;
 361         struct slot_info *s = &slot[slot_num];
 362         struct audio_format_info *a = &afi[s->format];
 363
 364         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 365         if (!a->num_writers)
 366                 s->wng = setup_default_wng();
 367         else
 368                 s->wng = wng_new(a->num_writers);
 369         if (s->fc) {
 370                 s->wng->buf = s->fc->outbuf;
 371                 s->wng->loaded = s->fc->out_loaded;
 372                 s->wng->input_error = &s->fc->task.error;
 373                 s->wng->channels = &s->fc->channels;
 374                 s->wng->samplerate = &s->fc->samplerate;
 375                 s->fc->output_error = &s->wng->task.error;
 376                 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
 377         } else {
 378                 s->wng->buf = s->receiver_node->buf;
 379                 s->wng->loaded = &s->receiver_node->loaded;
 380                 s->wng->input_error = &s->receiver_node->task.error;
 381         }
 382         for (i = 0; i < a->num_writers; i++) {
 383                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 384                 s->wng->writer_nodes[i].writer = a->writers[i];
 385         }
 386         ret = wng_open(s->wng);
 387         if (ret < 0) {
 388                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 389                 return;
 390         }
 391         s->wstime = *now;
 392         activate_inactive_grab_clients(slot_num, s->format, s->fc);
 393 }
 394
 395 static int open_receiver(int format)
 396 {
 397         struct audio_format_info *a = &afi[format];
 398         struct slot_info *s;
 399         int ret, slot_num;
 400         struct receiver_node *rn;
 401         const struct timeval restart_delay = {2, 0};
 402
 403         ret = get_empty_slot();
 404         if (ret < 0)
 405                 goto err;
 406         slot_num = ret;
 407         s = &slot[slot_num];
 408         s->format = format;
 409         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 410         rn = s->receiver_node;
 411         rn->receiver = a->receiver;
 412         rn->conf = a->receiver_conf;
 413         ret = a->receiver->open(s->receiver_node);
 414         if (ret < 0) {
 415                 free(s->receiver_node);
 416                 s->receiver_node = NULL;
 417                 goto err;
 418         }
 419         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 420                 audio_formats[s->format], a->receiver->name, slot_num);
 421         rn->task.pre_select = a->receiver->pre_select;
 422         rn->task.post_select = a->receiver->post_select;
 423         sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
 424         register_task(&rn->task);
 425         ret = 1;
 426 err:
 427         if (ret < 0)
 428                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 429         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 430         return ret;
 431 }
 432
 433 static int receiver_running(int format)
 434 {
 435         int i;
 436
 437         FOR_EACH_SLOT(i) {
 438                 struct slot_info *s = &slot[i];
 439                 if (s->format == format && s->receiver_node)
 440                         return 1;
 441         }
 442         return 0;
 443 }
 444
 445 static int open_current_receiver(struct sched *s)
 446 {
 447         struct timeval diff;
 448         int cafn = stat_task->current_audio_format_num;
 449
 450         if (cafn < 0 || !stat_task->ct)
 451                 return 0;
 452         if (receiver_running(cafn))
 453                 return 0;
 454         if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
 455                 s->timeout = diff;
 456                 return 0;
 457         }
 458         return open_receiver(cafn) < 0? 0 : 1;
 459 }
 460
 461 static unsigned compute_time_diff(const struct timeval *status_time)
 462 {
 463         struct timeval tmp, diff;
 464         static unsigned count;
 465         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 466         const struct timeval max_deviation = {0, 500 * 1000};
 467         const int time_smooth = 5;
 468
 469         if (!status_time)
 470                 return count;
 471         sign = tv_diff(status_time, now, &diff);
 472 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 473 //                      sign, sa_time_diff_sign);
 474         if (!count) {
 475                 sa_time_diff_sign = sign;
 476                 stat_task->sa_time_diff = diff;
 477                 count++;
 478                 goto out;
 479         }
 480         if (count > 5) {
 481                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 482                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 483                         PARA_WARNING_LOG("time diff jump: %lims\n",
 484                                 s * tv2ms(&tmp));
 485         }
 486         count++;
 487         sa_time_diff_sign = tv_convex_combination(
 488                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 489                 count > 10? sign : sign * time_smooth, &diff,
 490                 &tmp);
 491         stat_task->sa_time_diff = tmp;
 492         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 493                 sign > 0? "+" : "-",
 494                 tv2ms(&diff),
 495                 sa_time_diff_sign ? "+" : "-",
 496                 tv2ms(&stat_task->sa_time_diff)
 497         );
 498 out:
 499         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 500         return count;
 501 }
 502
 503 static int check_stat_line(char *line, __a_unused void *data)
 504 {
 505         int itemnum;
 506         size_t ilen = 0;
 507         long unsigned sec, usec;
 508         char *tmp;
 509
 510         //PARA_INFO_LOG("line: %s\n", line);
 511         if (!line)
 512                 return 1;
 513         itemnum = stat_line_valid(line);
 514         if (itemnum < 0) {
 515                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 516                 return 1;
 517         }
 518         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 519                 return 1;
 520         tmp = make_message("%s\n", line);
 521         stat_client_write(tmp, itemnum);
 522         free(tmp);
 523         free(stat_item_values[itemnum]);
 524         stat_item_values[itemnum] = para_strdup(line);
 525         ilen = strlen(status_item_list[itemnum]);
 526         switch (itemnum) {
 527         case SI_STATUS:
 528                 stat_task->playing = strstr(line, "playing")? 1 : 0;
 529                 PARA_INFO_LOG("stat task playing: %d\n", stat_task->playing);
 530                 break;
 531         case SI_OFFSET:
 532                 stat_task->offset_seconds = atoi(line + ilen + 1);
 533                 break;
 534         case SI_SECONDS_TOTAL:
 535                 stat_task->length_seconds = atoi(line + ilen + 1);
 536                 break;
 537         case SI_STREAM_START:
 538                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 539                         struct timeval a_start, delay;
 540                         delay.tv_sec = conf.stream_delay_arg / 1000;
 541                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 542                         stat_task->server_stream_start.tv_sec = sec;
 543                         stat_task->server_stream_start.tv_usec = usec;
 544                         if (compute_time_diff(NULL) > 2) {
 545                                 if (stat_task->sa_time_diff_sign < 0)
 546                                         tv_add(&stat_task->server_stream_start,
 547                                                 &stat_task->sa_time_diff, &a_start);
 548                                 else
 549                                         tv_diff(&stat_task->server_stream_start,
 550                                                 &stat_task->sa_time_diff, &a_start);
 551                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 552                         }
 553                 }
 554                 break;
 555         case SI_CURRENT_TIME:
 556                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 557                         struct timeval tv = {sec, usec};
 558                         compute_time_diff(&tv);
 559                 }
 560                 break;
 561         case SI_FORMAT:
 562                 stat_task->current_audio_format_num = get_audio_format_num(
 563                         line + ilen + 1);
 564         }
 565         return 1;
 566 }
 567
 568 static int parse_stream_command(const char *txt, char **cmd)
 569 {
 570         char *p = strchr(txt, ':');
 571         int i;
 572
 573         if (!p)
 574                 return -E_MISSING_COLON;
 575         p++;
 576         FOR_EACH_AUDIO_FORMAT(i) {
 577                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 578                         continue;
 579                 *cmd = p;
 580                 return i;
 581         }
 582         return -E_UNSUPPORTED_AUDIO_FORMAT;
 583 }
 584
 585 static int add_filter(int format, char *cmdline)
 586 {
 587         struct audio_format_info *a = &afi[format];
 588         int filter_num, nf = a->num_filters;
 589
 590         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 591         if (filter_num < 0)
 592                 return filter_num;
 593         a->filter_nums[nf] = filter_num;
 594         a->num_filters++;
 595         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 596                 filters[filter_num].name);
 597         return filter_num;
 598 }
 599
 600 static int init_writers(void)
 601 {
 602         int i, ret, nw;
 603         char *cmd;
 604         struct audio_format_info *a;
 605
 606         init_supported_writers();
 607         nw = PARA_MAX(1U, conf.writer_given);
 608         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 609         FOR_EACH_AUDIO_FORMAT(i) {
 610                 a = &afi[i];
 611                 a->writer_conf = para_malloc(nw * sizeof(void *));
 612                 a->writers = para_malloc(nw * sizeof(struct writer *));
 613                 a->num_writers = 0;
 614         }
 615         for (i = 0; i < conf.writer_given; i++) {
 616                 void *wconf;
 617                 int writer_num;
 618                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 619                 if (ret < 0)
 620                         goto out;
 621                 a = &afi[ret];
 622                 nw = a->num_writers;
 623                 wconf = check_writer_arg(cmd, &writer_num);
 624                 if (!wconf) {
 625                         ret = writer_num;
 626                         goto out;
 627                 }
 628                 a->writers[nw] = &writers[writer_num];
 629                 a->writer_conf[nw] = wconf;
 630                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 631                         nw, writer_names[writer_num]);
 632                 a->num_writers++;
 633         }
 634         ret = 1;
 635 out:
 636         return ret;
 637 }
 638
 639 static int init_receivers(void)
 640 {
 641         int i, ret, receiver_num;
 642         char *cmd = NULL;
 643         struct audio_format_info *a;
 644
 645         for (i = 0; receivers[i].name; i++) {
 646                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
 647                 receivers[i].init(&receivers[i]);
 648         }
 649         for (i = conf.receiver_given - 1; i >= 0; i--) {
 650                 char *arg = conf.receiver_arg[i];
 651                 char *recv_arg = strchr(arg, ':');
 652                 ret = -E_MISSING_COLON;
 653                 if (!recv_arg)
 654                         goto out;
 655                 *recv_arg = '\0';
 656                 recv_arg++;
 657                 ret = get_audio_format_num(arg);
 658                 if (ret < 0)
 659                         goto out;
 660                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 661                 if (!afi[ret].receiver_conf) {
 662                         ret = -E_RECV_SYNTAX;
 663                         goto out;
 664                 }
 665                 afi[ret].receiver = &receivers[receiver_num];
 666         }
 667         /* use the first available receiver with no arguments
 668          * for those audio formats for which no receiver
 669          * was specified
 670          */
 671         cmd = para_strdup(receivers[0].name);
 672         FOR_EACH_AUDIO_FORMAT(i) {
 673                 a = &afi[i];
 674                 if (a->receiver_conf)
 675                         continue;
 676                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 677                 if (!a->receiver_conf)
 678                         return -E_RECV_SYNTAX;
 679                 a->receiver = &receivers[receiver_num];
 680         }
 681         ret = 1;
 682 out:
 683         free(cmd);
 684         return ret;
 685 }
 686
 687 static int init_default_filters(void)
 688 {
 689         int i, ret = 1;
 690
 691         FOR_EACH_AUDIO_FORMAT(i) {
 692                 struct audio_format_info *a = &afi[i];
 693                 char *tmp;
 694                 int j;
 695
 696                 if (a->num_filters)
 697                         continue; /* no default -- nothing to to */
 698                 /* add "dec" to audio format name */
 699                 tmp = make_message("%sdec", audio_formats[i]);
 700                 for (j = 0; filters[j].name; j++)
 701                         if (!strcmp(tmp, filters[j].name))
 702                                 break;
 703                 free(tmp);
 704                 ret = -E_UNSUPPORTED_FILTER;
 705                 if (!filters[j].name)
 706                         goto out;
 707                 tmp = para_strdup(filters[j].name);
 708                 ret = add_filter(i, tmp);
 709                 free(tmp);
 710                 if (ret < 0)
 711                         goto out;
 712                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 713                         filters[j].name);
 714         }
 715 out:
 716         return ret;
 717 }
 718
 719 static int init_filters(void)
 720 {
 721         int i, ret, nf;
 722
 723         filter_init(filters);
 724         nf = PARA_MAX(1U, conf.filter_given);
 725         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 726         FOR_EACH_AUDIO_FORMAT(i) {
 727                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 728                 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
 729         }
 730         if (!conf.no_default_filters_given)
 731                 return init_default_filters();
 732         for (i = 0; i < conf.filter_given; i++) {
 733                 char *arg = conf.filter_arg[i];
 734                 char *filter_name = strchr(arg, ':');
 735                 ret = -E_MISSING_COLON;
 736                 if (!filter_name)
 737                         goto out;
 738                 *filter_name = '\0';
 739                 filter_name++;
 740                 ret = get_audio_format_num(arg);
 741                 if (ret < 0)
 742                         goto out;
 743                 ret = add_filter(ret, filter_name);
 744                 if (ret < 0)
 745                         goto out;
 746         }
 747         ret = init_default_filters(); /* use default values for the rest */
 748 out:
 749         return ret;
 750 }
 751
 752 static int init_stream_io(void)
 753 {
 754         int ret;
 755
 756         ret = init_writers();
 757         if (ret < 0)
 758                 return ret;
 759         ret = init_receivers();
 760         if (ret < 0)
 761                 return ret;
 762         ret = init_filters();
 763         if (ret < 0)
 764                 return ret;
 765         return 1;
 766 }
 767
 768 /* does not unlink socket on errors */
 769 static int audiod_get_socket(void)
 770 {
 771         struct sockaddr_un unix_addr;
 772         int ret, fd;
 773
 774         if (conf.socket_given)
 775                 socket_name = para_strdup(conf.socket_arg);
 776         else {
 777                 char *hn = para_hostname();
 778                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 779                         hn);
 780                 free(hn);
 781         }
 782         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 783         if (conf.force_given)
 784                 unlink(socket_name);
 785         ret = create_local_socket(socket_name, &unix_addr,
 786                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 787         if (ret < 0)
 788                 goto err;
 789         fd = ret;
 790         if (listen(fd , 5) < 0) {
 791                 ret = -ERRNO_TO_PARA_ERROR(errno);
 792                 goto err;
 793         }
 794         ret = mark_fd_nonblocking(fd);
 795         if (ret < 0)
 796                 goto err;
 797         return fd;
 798 err:
 799         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 800         exit(EXIT_FAILURE);
 801 }
 802
 803 static void signal_pre_select(struct sched *s, struct task *t)
 804 {
 805         struct signal_task *st = container_of(t, struct signal_task, task);
 806         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 807 }
 808
 809 static void signal_post_select(struct sched *s, struct task *t)
 810 {
 811         struct signal_task *st = container_of(t, struct signal_task, task);
 812
 813         if (!FD_ISSET(st->fd, &s->rfds))
 814                 return;
 815
 816         st->signum = para_next_signal();
 817         switch (st->signum) {
 818         case SIGINT:
 819         case SIGTERM:
 820         case SIGHUP:
 821                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 822                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 823         }
 824 }
 825
 826 static void signal_setup_default(struct signal_task *st)
 827 {
 828         st->task.pre_select = signal_pre_select;
 829         st->task.post_select = signal_post_select;
 830         sprintf(st->task.status, "signal task");
 831 }
 832
 833 static void command_pre_select(struct sched *s, struct task *t)
 834 {
 835         struct command_task *ct = container_of(t, struct command_task, task);
 836         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 837 }
 838
 839 static void command_post_select(struct sched *s, struct task *t)
 840 {
 841         int ret;
 842         struct command_task *ct = container_of(t, struct command_task, task);
 843
 844         audiod_status_dump();
 845         if (!FD_ISSET(ct->fd, &s->rfds))
 846                 return;
 847         ret = handle_connect(ct->fd);
 848         if (ret < 0)
 849                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 850 }
 851
 852 static void init_command_task(struct command_task *ct)
 853 {
 854         ct->task.pre_select = command_pre_select;
 855         ct->task.post_select = command_post_select;
 856         ct->task.error = 0;
 857         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 858         sprintf(ct->task.status, "command task");
 859 }
 860
 861 static void close_stat_pipe(void)
 862 {
 863         int i;
 864
 865         if (!stat_task->ct)
 866                 return;
 867         client_close(stat_task->ct);
 868         stat_task->ct = NULL;
 869         FOR_EACH_STATUS_ITEM(i) {
 870                 free(stat_item_values[i]);
 871                 stat_item_values[i] = NULL;
 872         }
 873         dump_empty_status();
 874         stat_task->length_seconds = 0;
 875         stat_task->offset_seconds = 0;
 876         audiod_status_dump();
 877         stat_task->playing = 0;
 878 }
 879
 880 /**
 881  * close the connection to para_server and exit
 882  *
 883  * \param status the exit status which is passed to exit(3)
 884  * \param msg the log message
 885  *
 886  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
 887  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
 888  * EXIT_FAILURE.
 889  *
 890  * \sa exit(3)
 891  */
 892 void __noreturn clean_exit(int status, const char *msg)
 893 {
 894         PARA_EMERG_LOG("%s\n", msg);
 895         if (socket_name)
 896                 unlink(socket_name);
 897         close_stat_pipe();
 898         exit(status);
 899 }
 900
 901 /* avoid busy loop if server is down */
 902 static void set_stat_task_restart_barrier(unsigned seconds)
 903 {
 904         struct timeval delay = {seconds, 0};
 905         tv_add(now, &delay, &stat_task->restart_barrier);
 906 }
 907
 908 static void try_to_close_slot(int slot_num)
 909 {
 910         struct slot_info *s = &slot[slot_num];
 911
 912         if (s->format < 0)
 913                 return;
 914         if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
 915                 return;
 916         if (s->fc && s->fc->task.error != -E_TASK_UNREGISTERED)
 917                 return;
 918         if (s->wng && s->wng->task.error != -E_TASK_UNREGISTERED)
 919                 return;
 920         PARA_INFO_LOG("closing slot %d\n", slot_num);
 921         wng_close(s->wng);
 922         close_filters(s->fc);
 923         free(s->fc);
 924         close_receiver(slot_num);
 925         clear_slot(slot_num);
 926 }
 927
 928 /*
 929  * Check if any receivers/filters/writers need to be started and do so if
 930  * necessary.
 931  */
 932 static void start_stop_decoders(struct sched *s)
 933 {
 934         int i;
 935
 936         FOR_EACH_SLOT(i)
 937                 try_to_close_slot(i);
 938         if (audiod_status != AUDIOD_ON || !stat_task->playing)
 939                 return kill_all_decoders(-E_NOT_PLAYING);
 940         open_current_receiver(s);
 941         FOR_EACH_SLOT(i) {
 942                 struct slot_info *sl = &slot[i];
 943                 struct audio_format_info *a;
 944                 struct timeval diff;
 945
 946                 if (sl->format < 0)
 947                         continue;
 948                 a = &afi[sl->format];
 949                 if (!sl->receiver_node)
 950                         continue;
 951                 if ((!a->num_filters || sl->fc) && sl->wng)
 952                         continue; /* everything already started */
 953                 if (!a->num_filters) {
 954                         if (sl->receiver_node->loaded && !sl->wng) {
 955                                 open_writers(i);
 956                         }
 957                         continue;
 958                 }
 959                 if (sl->receiver_node->loaded && !sl->fc) {
 960                         open_filters(i);
 961                         continue;
 962                 }
 963                 if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
 964                         continue;
 965                 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
 966                         open_writers(i);
 967                         continue;
 968                 }
 969                 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
 970                 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
 971                         s->timeout = diff;
 972                 }
 973         }
 974 }
 975
 976
 977 /* restart the client task if necessary */
 978 static void status_pre_select(struct sched *s, struct task *t)
 979 {
 980         struct status_task *st = container_of(t, struct status_task, task);
 981
 982         if (audiod_status == AUDIOD_OFF) {
 983                 if (!st->ct)
 984                         goto out;
 985                 if (st->ct->task.error >= 0) {
 986                         st->ct->task.error = -E_AUDIOD_OFF;
 987                         goto out;
 988                 }
 989                 if (st->ct->task.error != -E_TASK_UNREGISTERED)
 990                         goto out;
 991                 close_stat_pipe();
 992                 st->clock_diff_count = conf.clock_diff_count_arg;
 993                 goto out;
 994         }
 995         if (st->ct) {
 996                 unsigned bytes_left;
 997                 if (st->ct->task.error < 0) {
 998                         if (st->ct->task.error != -E_TASK_UNREGISTERED)
 999                                 goto out;
1000                         close_stat_pipe();
1001                         goto out;
1002                 }
1003                 if (st->ct->status != CL_RECEIVING)
1004                         goto out;
1005                 bytes_left = for_each_line(st->ct->buf, st->ct->loaded,
1006                         &check_stat_line, NULL);
1007                 if (st->ct->loaded != bytes_left) {
1008                         st->last_status_read = *now;
1009                         st->ct->loaded = bytes_left;
1010                 } else {
1011                         struct timeval diff;
1012                         tv_diff(now, &st->last_status_read, &diff);
1013                         if (diff.tv_sec > 61)
1014                                 st->ct->task.error = -E_STATUS_TIMEOUT;
1015                 }
1016                 goto out;
1017         }
1018         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1019                 goto out;
1020         if (st->clock_diff_count) { /* get status only one time */
1021                 char *argv[] = {"audiod", "stat", "1", NULL};
1022                 int argc = 3;
1023                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1024                 st->clock_diff_count--;
1025                 client_open(argc, argv, &st->ct);
1026                 set_stat_task_restart_barrier(2);
1027
1028         } else {
1029                 char *argv[] = {"audiod", "stat", NULL};
1030                 int argc = 2;
1031                 client_open(argc, argv, &st->ct);
1032                 set_stat_task_restart_barrier(5);
1033         }
1034         free(stat_item_values[SI_BASENAME]);
1035         stat_item_values[SI_BASENAME] = make_message(
1036                 "%s: no connection to para_server\n",
1037                 status_item_list[SI_BASENAME]);
1038         stat_client_write(stat_item_values[SI_BASENAME],
1039                 SI_BASENAME);
1040         st->last_status_read = *now;
1041 out:
1042         start_stop_decoders(s);
1043 }
1044
1045 static void init_status_task(struct status_task *st)
1046 {
1047         memset(st, 0, sizeof(struct status_task));
1048         st->task.pre_select = status_pre_select;
1049         st->sa_time_diff_sign = 1;
1050         st->clock_diff_count = conf.clock_diff_count_arg;
1051         st->current_audio_format_num = -1;
1052         sprintf(st->task.status, "status task");
1053 }
1054
1055 static void set_initial_status(void)
1056 {
1057         audiod_status = AUDIOD_ON;
1058         if (!conf.mode_given)
1059                 return;
1060         if (!strcmp(conf.mode_arg, "sb")) {
1061                 audiod_status = AUDIOD_STANDBY;
1062                 return;
1063         }
1064         if (!strcmp(conf.mode_arg, "off")) {
1065                 audiod_status = AUDIOD_OFF;
1066                 return;
1067         }
1068         if (strcmp(conf.mode_arg, "on"))
1069                 PARA_WARNING_LOG("invalid mode\n");
1070 }
1071
1072 /**
1073  * the main function of para_audiod
1074  *
1075  * \param argc usual argument count
1076  * \param argv usual argument vector
1077  *
1078  * \return EXIT_SUCCESS or EXIT_FAILURE
1079  *
1080  * \sa para_audiod(1)
1081  * */
1082 int main(int argc, char *argv[])
1083 {
1084         char *config_file;
1085         int ret, i;
1086         static struct sched s;
1087         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1088         struct audiod_cmdline_parser_params params = {
1089                 .override = 0,
1090                 .initialize = 1,
1091                 .check_required = 0,
1092                 .check_ambiguity = 0,
1093                 .print_errors = 1
1094         };
1095
1096         valid_fd_012();
1097         audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1098         HANDLE_VERSION_FLAG("audiod", conf);
1099         para_drop_privileges(conf.user_arg, conf.group_arg);
1100         config_file = configfile_exists();
1101         if (config_file) {
1102                 params.override = 0;
1103                 params.initialize = 0;
1104                 params.check_required = 1;
1105                 params.check_ambiguity = 0;
1106                 params.print_errors = 1;
1107                 if (audiod_cmdline_parser_config_file(config_file, &conf, &params)) {
1108                         PARA_EMERG_LOG("parse error in config file\n");
1109                         exit(EXIT_FAILURE);
1110                 }
1111                 free(config_file);
1112         }
1113         if (conf.logfile_given)
1114                 logfile = open_log(conf.logfile_arg);
1115         log_welcome("para_audiod", conf.loglevel_arg);
1116         i = init_stream_io();
1117         if (i < 0) {
1118                 PARA_EMERG_LOG("init stream io error: %s\n", para_strerror(-i));
1119                 exit(EXIT_FAILURE);
1120         }
1121         server_uptime(UPTIME_SET);
1122         set_initial_status();
1123         FOR_EACH_SLOT(i)
1124                 clear_slot(i);
1125         init_grabbing();
1126         setup_signal_handling();
1127         signal_setup_default(sig_task);
1128
1129         init_status_task(stat_task);
1130         init_command_task(cmd_task);
1131
1132         if (conf.daemon_given)
1133                 daemon_init();
1134
1135         register_task(&sig_task->task);
1136         register_task(&cmd_task->task);
1137         register_task(&stat_task->task);
1138         s.default_timeout.tv_sec = 0;
1139         s.default_timeout.tv_usec = 99 * 1000;
1140         ret = schedule(&s);
1141
1142         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1143         return EXIT_FAILURE;
1144 }