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