audiod.c

   1 /*
   2  * Copyright (C) 2005-2009 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 "ggo.h"
  18 #include "recv.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 <= LL_INFO)
 211                 fprintf(outfd, "%i ", ll);
 212         va_start(argp, fmt);
 213         vfprintf(outfd, fmt, argp);
 214         va_end(argp);
 215 }
 216
 217 static void parse_config_or_die(void)
 218 {
 219         char *config_file;
 220
 221         if (conf.config_file_given)
 222                 config_file = para_strdup(conf.config_file_arg);
 223         else {
 224                 char *home = para_homedir();
 225                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 226                 free(home);
 227         }
 228         if (conf.config_file_given && !file_exists(config_file)) {
 229                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 230                 goto err;
 231         }
 232         if (config_file) {
 233                 struct audiod_cmdline_parser_params params = {
 234                         .override = 0,
 235                         .initialize = 0,
 236                         .check_required = 1,
 237                         .check_ambiguity = 0,
 238                         .print_errors = 1
 239                 };
 240                 if (audiod_cmdline_parser_config_file(config_file, &conf, &params)) {
 241                         PARA_EMERG_LOG("parse error in config file\n");
 242                         goto err;
 243                 }
 244         }
 245         free(config_file);
 246         return;
 247 err:
 248         free(config_file);
 249         exit(EXIT_FAILURE);
 250 }
 251
 252 static void setup_signal_handling(void)
 253 {
 254         sig_task->fd = para_signal_init();
 255         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 256         para_install_sighandler(SIGINT);
 257         para_install_sighandler(SIGTERM);
 258         para_install_sighandler(SIGHUP);
 259         signal(SIGPIPE, SIG_IGN);
 260 }
 261
 262 static void clear_slot(int slot_num)
 263 {
 264         struct slot_info *s = &slot[slot_num];
 265
 266         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 267         memset(s, 0, sizeof(struct slot_info));
 268         s->format = -1;
 269 }
 270
 271 static void close_receiver(int slot_num)
 272 {
 273         struct slot_info *s = &slot[slot_num];
 274         struct audio_format_info *a;
 275
 276         if (s->format < 0 || !s->receiver_node)
 277                 return;
 278         a = &afi[s->format];
 279         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 280                 audio_formats[s->format], slot_num);
 281         a->receiver->close(s->receiver_node);
 282         free(s->receiver_node);
 283         s->receiver_node = NULL;
 284 }
 285
 286 static void kill_all_decoders(int error)
 287 {
 288         int i;
 289
 290         FOR_EACH_SLOT(i) {
 291                 struct slot_info *s = &slot[i];
 292                 if (s->wng && s->wng->task.error >= 0) {
 293                         PARA_INFO_LOG("deactivating wng in slot %d\n",
 294                                 i);
 295                         s->wng->task.error = error;
 296                 }
 297                 if (s->fc && s->fc->task.error >= 0) {
 298                         PARA_INFO_LOG("deactivatimg filter chain in slot %d\n", i);
 299                         s->fc->task.error = error;
 300                 }
 301                 if (s->receiver_node && s->receiver_node->task.error >= 0) {
 302                         PARA_INFO_LOG("deactivating receiver_node in slot %d\n", i);
 303                         s->receiver_node->task.error = error;
 304                 }
 305         }
 306 }
 307
 308 static int get_empty_slot(void)
 309 {
 310         int i;
 311         struct slot_info *s;
 312
 313         FOR_EACH_SLOT(i) {
 314                 s = &slot[i];
 315                 if (s->format < 0) {
 316                         clear_slot(i);
 317                         return i;
 318                 }
 319                 if (s->wng || s->receiver_node || s->fc)
 320                         continue;
 321                 clear_slot(i);
 322                 return i;
 323         }
 324         return -E_NO_MORE_SLOTS;
 325 }
 326
 327 /**
 328  * get the number of filters
 329  *
 330  * \param audio_format_num the number identifying the audio format
 331  *
 332  * \return the number of filters for the given audio format
 333  *
 334  * \sa struct filter;
 335  */
 336 int num_filters(int audio_format_num)
 337 {
 338         return afi[audio_format_num].num_filters;
 339 }
 340
 341 static void open_filters(int slot_num)
 342 {
 343         struct slot_info *s = &slot[slot_num];
 344         struct audio_format_info *a = &afi[s->format];
 345         struct filter_node *fn;
 346         int nf = a->num_filters;
 347         int i;
 348
 349         s->fc = NULL;
 350         if (!nf)
 351                 return;
 352         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 353         s->fc = para_calloc(sizeof(struct filter_chain));
 354         s->fc->filter_nodes = para_malloc(nf * sizeof(struct filter_node));
 355         s->fc->inbuf = s->receiver_node->buf;
 356         s->fc->in_loaded = &s->receiver_node->loaded;
 357         s->fc->input_error = &s->receiver_node->task.error;
 358         s->fc->task.pre_select = filter_pre_select;
 359         s->fc->task.post_select = NULL;
 360         s->fc->task.error = 0;
 361         s->fc->num_filters = nf;
 362
 363         s->receiver_node->output_error = &s->fc->task.error;
 364         sprintf(s->fc->task.status, "filter chain");
 365         FOR_EACH_FILTER_NODE(fn, s->fc, i) {
 366                 struct filter *f = filters + a->filter_nums[i];
 367                 fn->filter_num = a->filter_nums[i];
 368                 fn->conf = a->filter_conf[i];
 369                 fn->fc = s->fc;
 370                 fn->loaded = 0;
 371                 INIT_LIST_HEAD(&fn->callbacks);
 372                 f->open(fn);
 373                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 374                         audio_formats[s->format], i,  nf, f->name, slot_num);
 375                 s->fc->outbuf = fn->buf;
 376                 s->fc->out_loaded = &fn->loaded;
 377         }
 378         register_task(&s->fc->task);
 379 }
 380
 381 static void open_writers(int slot_num)
 382 {
 383         int ret, i;
 384         struct slot_info *s = &slot[slot_num];
 385         struct audio_format_info *a = &afi[s->format];
 386
 387         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 388         if (!a->num_writers)
 389                 s->wng = setup_default_wng();
 390         else
 391                 s->wng = wng_new(a->num_writers);
 392         if (s->fc) {
 393                 s->wng->buf = s->fc->outbuf;
 394                 s->wng->loaded = s->fc->out_loaded;
 395                 s->wng->input_error = &s->fc->task.error;
 396                 s->wng->channels = &s->fc->channels;
 397                 s->wng->samplerate = &s->fc->samplerate;
 398                 s->fc->output_error = &s->wng->task.error;
 399                 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
 400         } else {
 401                 s->wng->buf = s->receiver_node->buf;
 402                 s->wng->loaded = &s->receiver_node->loaded;
 403                 s->wng->input_error = &s->receiver_node->task.error;
 404         }
 405         for (i = 0; i < a->num_writers; i++) {
 406                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 407                 s->wng->writer_nodes[i].writer = a->writers[i];
 408         }
 409         ret = wng_open(s->wng);
 410         if (ret < 0) {
 411                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 412                 return;
 413         }
 414         s->wstime = *now;
 415         activate_inactive_grab_clients(slot_num, s->format, s->fc);
 416 }
 417
 418 static int open_receiver(int format)
 419 {
 420         struct audio_format_info *a = &afi[format];
 421         struct slot_info *s;
 422         int ret, slot_num;
 423         struct receiver_node *rn;
 424         const struct timeval restart_delay = {2, 0};
 425
 426         ret = get_empty_slot();
 427         if (ret < 0)
 428                 goto err;
 429         slot_num = ret;
 430         s = &slot[slot_num];
 431         s->format = format;
 432         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 433         rn = s->receiver_node;
 434         rn->receiver = a->receiver;
 435         rn->conf = a->receiver_conf;
 436         ret = a->receiver->open(s->receiver_node);
 437         if (ret < 0) {
 438                 free(s->receiver_node);
 439                 s->receiver_node = NULL;
 440                 goto err;
 441         }
 442         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 443                 audio_formats[s->format], a->receiver->name, slot_num);
 444         rn->task.pre_select = a->receiver->pre_select;
 445         rn->task.post_select = a->receiver->post_select;
 446         sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
 447         register_task(&rn->task);
 448         ret = 1;
 449 err:
 450         if (ret < 0)
 451                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 452         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 453         return ret;
 454 }
 455
 456 static int receiver_running(int format)
 457 {
 458         int i;
 459
 460         FOR_EACH_SLOT(i) {
 461                 struct slot_info *s = &slot[i];
 462                 if (s->format == format && s->receiver_node)
 463                         return 1;
 464         }
 465         return 0;
 466 }
 467
 468 static int open_current_receiver(struct sched *s)
 469 {
 470         struct timeval diff;
 471         int cafn = stat_task->current_audio_format_num;
 472
 473         if (cafn < 0 || !stat_task->ct)
 474                 return 0;
 475         if (receiver_running(cafn))
 476                 return 0;
 477         if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
 478                 s->timeout = diff;
 479                 return 0;
 480         }
 481         return open_receiver(cafn) < 0? 0 : 1;
 482 }
 483
 484 static unsigned compute_time_diff(const struct timeval *status_time)
 485 {
 486         struct timeval tmp, diff;
 487         static unsigned count;
 488         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 489         const struct timeval max_deviation = {0, 500 * 1000};
 490         const int time_smooth = 5;
 491
 492         if (!status_time)
 493                 return count;
 494         sign = tv_diff(status_time, now, &diff);
 495 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 496 //                      sign, sa_time_diff_sign);
 497         if (!count) {
 498                 sa_time_diff_sign = sign;
 499                 stat_task->sa_time_diff = diff;
 500                 count++;
 501                 goto out;
 502         }
 503         if (count > 5) {
 504                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 505                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 506                         PARA_WARNING_LOG("time diff jump: %lims\n",
 507                                 s * tv2ms(&tmp));
 508         }
 509         count++;
 510         sa_time_diff_sign = tv_convex_combination(
 511                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 512                 count > 10? sign : sign * time_smooth, &diff,
 513                 &tmp);
 514         stat_task->sa_time_diff = tmp;
 515         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 516                 sign > 0? "+" : "-",
 517                 tv2ms(&diff),
 518                 sa_time_diff_sign ? "+" : "-",
 519                 tv2ms(&stat_task->sa_time_diff)
 520         );
 521 out:
 522         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 523         return count;
 524 }
 525
 526 static int check_stat_line(char *line, __a_unused void *data)
 527 {
 528         int itemnum;
 529         size_t ilen = 0;
 530         long unsigned sec, usec;
 531         char *tmp;
 532
 533         //PARA_INFO_LOG("line: %s\n", line);
 534         if (!line)
 535                 return 1;
 536         itemnum = stat_line_valid(line);
 537         if (itemnum < 0) {
 538                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 539                 return 1;
 540         }
 541         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 542                 return 1;
 543         tmp = make_message("%s\n", line);
 544         stat_client_write(tmp, itemnum);
 545         free(tmp);
 546         free(stat_item_values[itemnum]);
 547         stat_item_values[itemnum] = para_strdup(line);
 548         ilen = strlen(status_item_list[itemnum]);
 549         switch (itemnum) {
 550         case SI_STATUS:
 551                 stat_task->playing = strstr(line, "playing")? 1 : 0;
 552                 PARA_INFO_LOG("stat task playing: %d\n", stat_task->playing);
 553                 break;
 554         case SI_OFFSET:
 555                 stat_task->offset_seconds = atoi(line + ilen + 1);
 556                 break;
 557         case SI_SECONDS_TOTAL:
 558                 stat_task->length_seconds = atoi(line + ilen + 1);
 559                 break;
 560         case SI_STREAM_START:
 561                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 562                         struct timeval a_start, delay;
 563                         delay.tv_sec = conf.stream_delay_arg / 1000;
 564                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 565                         stat_task->server_stream_start.tv_sec = sec;
 566                         stat_task->server_stream_start.tv_usec = usec;
 567                         if (compute_time_diff(NULL) > 2) {
 568                                 if (stat_task->sa_time_diff_sign < 0)
 569                                         tv_add(&stat_task->server_stream_start,
 570                                                 &stat_task->sa_time_diff, &a_start);
 571                                 else
 572                                         tv_diff(&stat_task->server_stream_start,
 573                                                 &stat_task->sa_time_diff, &a_start);
 574                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 575                         }
 576                 }
 577                 break;
 578         case SI_CURRENT_TIME:
 579                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 580                         struct timeval tv = {sec, usec};
 581                         compute_time_diff(&tv);
 582                 }
 583                 break;
 584         case SI_FORMAT:
 585                 stat_task->current_audio_format_num = get_audio_format_num(
 586                         line + ilen + 1);
 587         }
 588         return 1;
 589 }
 590
 591 static int parse_stream_command(const char *txt, char **cmd)
 592 {
 593         char *p = strchr(txt, ':');
 594         int i;
 595
 596         if (!p)
 597                 return -E_MISSING_COLON;
 598         p++;
 599         FOR_EACH_AUDIO_FORMAT(i) {
 600                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 601                         continue;
 602                 *cmd = p;
 603                 return i;
 604         }
 605         return -E_UNSUPPORTED_AUDIO_FORMAT;
 606 }
 607
 608 static int add_filter(int format, char *cmdline)
 609 {
 610         struct audio_format_info *a = &afi[format];
 611         int filter_num, nf = a->num_filters;
 612
 613         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 614         if (filter_num < 0)
 615                 return filter_num;
 616         a->filter_nums[nf] = filter_num;
 617         a->num_filters++;
 618         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 619                 filters[filter_num].name);
 620         return filter_num;
 621 }
 622
 623 static int init_writers(void)
 624 {
 625         int i, ret, nw;
 626         char *cmd;
 627         struct audio_format_info *a;
 628
 629         init_supported_writers();
 630         nw = PARA_MAX(1U, conf.writer_given);
 631         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 632         FOR_EACH_AUDIO_FORMAT(i) {
 633                 a = &afi[i];
 634                 a->writer_conf = para_malloc(nw * sizeof(void *));
 635                 a->writers = para_malloc(nw * sizeof(struct writer *));
 636                 a->num_writers = 0;
 637         }
 638         for (i = 0; i < conf.writer_given; i++) {
 639                 void *wconf;
 640                 int writer_num;
 641                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 642                 if (ret < 0)
 643                         goto out;
 644                 a = &afi[ret];
 645                 nw = a->num_writers;
 646                 wconf = check_writer_arg(cmd, &writer_num);
 647                 if (!wconf) {
 648                         ret = writer_num;
 649                         goto out;
 650                 }
 651                 a->writers[nw] = &writers[writer_num];
 652                 a->writer_conf[nw] = wconf;
 653                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 654                         nw, writer_names[writer_num]);
 655                 a->num_writers++;
 656         }
 657         ret = 1;
 658 out:
 659         return ret;
 660 }
 661
 662 static int init_receivers(void)
 663 {
 664         int i, ret, receiver_num;
 665         char *cmd = NULL;
 666         struct audio_format_info *a;
 667
 668         for (i = 0; receivers[i].name; i++) {
 669                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
 670                 receivers[i].init(&receivers[i]);
 671         }
 672         for (i = conf.receiver_given - 1; i >= 0; i--) {
 673                 char *arg = conf.receiver_arg[i];
 674                 char *recv_arg = strchr(arg, ':');
 675                 ret = -E_MISSING_COLON;
 676                 if (!recv_arg)
 677                         goto out;
 678                 *recv_arg = '\0';
 679                 recv_arg++;
 680                 ret = get_audio_format_num(arg);
 681                 if (ret < 0)
 682                         goto out;
 683                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 684                 if (!afi[ret].receiver_conf) {
 685                         ret = -E_RECV_SYNTAX;
 686                         goto out;
 687                 }
 688                 afi[ret].receiver = &receivers[receiver_num];
 689         }
 690         /* use the first available receiver with no arguments
 691          * for those audio formats for which no receiver
 692          * was specified
 693          */
 694         cmd = para_strdup(receivers[0].name);
 695         FOR_EACH_AUDIO_FORMAT(i) {
 696                 a = &afi[i];
 697                 if (a->receiver_conf)
 698                         continue;
 699                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 700                 if (!a->receiver_conf)
 701                         return -E_RECV_SYNTAX;
 702                 a->receiver = &receivers[receiver_num];
 703         }
 704         ret = 1;
 705 out:
 706         free(cmd);
 707         return ret;
 708 }
 709
 710 static int init_default_filters(void)
 711 {
 712         int i, ret = 1;
 713
 714         FOR_EACH_AUDIO_FORMAT(i) {
 715                 struct audio_format_info *a = &afi[i];
 716                 char *tmp;
 717                 int j;
 718
 719                 if (a->num_filters)
 720                         continue; /* no default -- nothing to to */
 721                 /* add "dec" to audio format name */
 722                 tmp = make_message("%sdec", audio_formats[i]);
 723                 for (j = 0; filters[j].name; j++)
 724                         if (!strcmp(tmp, filters[j].name))
 725                                 break;
 726                 free(tmp);
 727                 ret = -E_UNSUPPORTED_FILTER;
 728                 if (!filters[j].name)
 729                         goto out;
 730                 tmp = para_strdup(filters[j].name);
 731                 ret = add_filter(i, tmp);
 732                 free(tmp);
 733                 if (ret < 0)
 734                         goto out;
 735                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 736                         filters[j].name);
 737         }
 738 out:
 739         return ret;
 740 }
 741
 742 static int init_filters(void)
 743 {
 744         int i, ret, nf;
 745
 746         filter_init(filters);
 747         nf = PARA_MAX(1U, conf.filter_given);
 748         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 749         FOR_EACH_AUDIO_FORMAT(i) {
 750                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 751                 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
 752         }
 753         if (!conf.no_default_filters_given)
 754                 return init_default_filters();
 755         for (i = 0; i < conf.filter_given; i++) {
 756                 char *arg = conf.filter_arg[i];
 757                 char *filter_name = strchr(arg, ':');
 758                 ret = -E_MISSING_COLON;
 759                 if (!filter_name)
 760                         goto out;
 761                 *filter_name = '\0';
 762                 filter_name++;
 763                 ret = get_audio_format_num(arg);
 764                 if (ret < 0)
 765                         goto out;
 766                 ret = add_filter(ret, filter_name);
 767                 if (ret < 0)
 768                         goto out;
 769         }
 770         ret = init_default_filters(); /* use default values for the rest */
 771 out:
 772         return ret;
 773 }
 774
 775 static int init_stream_io(void)
 776 {
 777         int ret;
 778
 779         ret = init_writers();
 780         if (ret < 0)
 781                 return ret;
 782         ret = init_receivers();
 783         if (ret < 0)
 784                 return ret;
 785         ret = init_filters();
 786         if (ret < 0)
 787                 return ret;
 788         return 1;
 789 }
 790
 791 /* does not unlink socket on errors */
 792 static int audiod_get_socket(void)
 793 {
 794         struct sockaddr_un unix_addr;
 795         int ret, fd;
 796
 797         if (conf.socket_given)
 798                 socket_name = para_strdup(conf.socket_arg);
 799         else {
 800                 char *hn = para_hostname();
 801                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 802                         hn);
 803                 free(hn);
 804         }
 805         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 806         if (conf.force_given)
 807                 unlink(socket_name);
 808         ret = create_local_socket(socket_name, &unix_addr,
 809                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 810         if (ret < 0)
 811                 goto err;
 812         fd = ret;
 813         if (listen(fd , 5) < 0) {
 814                 ret = -ERRNO_TO_PARA_ERROR(errno);
 815                 goto err;
 816         }
 817         ret = mark_fd_nonblocking(fd);
 818         if (ret < 0)
 819                 goto err;
 820         return fd;
 821 err:
 822         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 823         exit(EXIT_FAILURE);
 824 }
 825
 826 static void signal_pre_select(struct sched *s, struct task *t)
 827 {
 828         struct signal_task *st = container_of(t, struct signal_task, task);
 829         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 830 }
 831
 832 static void signal_post_select(struct sched *s, struct task *t)
 833 {
 834         struct signal_task *st = container_of(t, struct signal_task, task);
 835
 836         if (!FD_ISSET(st->fd, &s->rfds))
 837                 return;
 838
 839         st->signum = para_next_signal();
 840         switch (st->signum) {
 841         case SIGINT:
 842         case SIGTERM:
 843         case SIGHUP:
 844                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 845                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 846         }
 847 }
 848
 849 static void signal_setup_default(struct signal_task *st)
 850 {
 851         st->task.pre_select = signal_pre_select;
 852         st->task.post_select = signal_post_select;
 853         sprintf(st->task.status, "signal task");
 854 }
 855
 856 static void command_pre_select(struct sched *s, struct task *t)
 857 {
 858         struct command_task *ct = container_of(t, struct command_task, task);
 859         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 860 }
 861
 862 static void command_post_select(struct sched *s, struct task *t)
 863 {
 864         int ret;
 865         struct command_task *ct = container_of(t, struct command_task, task);
 866
 867         audiod_status_dump();
 868         if (!FD_ISSET(ct->fd, &s->rfds))
 869                 return;
 870         ret = handle_connect(ct->fd);
 871         if (ret < 0)
 872                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 873 }
 874
 875 static void init_command_task(struct command_task *ct)
 876 {
 877         ct->task.pre_select = command_pre_select;
 878         ct->task.post_select = command_post_select;
 879         ct->task.error = 0;
 880         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 881         sprintf(ct->task.status, "command task");
 882 }
 883
 884 static void close_stat_pipe(void)
 885 {
 886         int i;
 887
 888         if (!stat_task->ct)
 889                 return;
 890         client_close(stat_task->ct);
 891         stat_task->ct = NULL;
 892         FOR_EACH_STATUS_ITEM(i) {
 893                 free(stat_item_values[i]);
 894                 stat_item_values[i] = NULL;
 895         }
 896         dump_empty_status();
 897         stat_task->length_seconds = 0;
 898         stat_task->offset_seconds = 0;
 899         audiod_status_dump();
 900         stat_task->playing = 0;
 901 }
 902
 903 /**
 904  * close the connection to para_server and exit
 905  *
 906  * \param status the exit status which is passed to exit(3)
 907  * \param msg the log message
 908  *
 909  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
 910  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
 911  * EXIT_FAILURE.
 912  *
 913  * \sa exit(3)
 914  */
 915 void __noreturn clean_exit(int status, const char *msg)
 916 {
 917         PARA_EMERG_LOG("%s\n", msg);
 918         if (socket_name)
 919                 unlink(socket_name);
 920         close_stat_pipe();
 921         exit(status);
 922 }
 923
 924 /* avoid busy loop if server is down */
 925 static void set_stat_task_restart_barrier(unsigned seconds)
 926 {
 927         struct timeval delay = {seconds, 0};
 928         tv_add(now, &delay, &stat_task->restart_barrier);
 929 }
 930
 931 static void try_to_close_slot(int slot_num)
 932 {
 933         struct slot_info *s = &slot[slot_num];
 934
 935         if (s->format < 0)
 936                 return;
 937         if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
 938                 return;
 939         if (s->fc && s->fc->task.error != -E_TASK_UNREGISTERED)
 940                 return;
 941         if (s->wng && s->wng->task.error != -E_TASK_UNREGISTERED)
 942                 return;
 943         PARA_INFO_LOG("closing slot %d\n", slot_num);
 944         wng_close(s->wng);
 945         close_filters(s->fc);
 946         free(s->fc);
 947         close_receiver(slot_num);
 948         clear_slot(slot_num);
 949 }
 950
 951 /*
 952  * Check if any receivers/filters/writers need to be started and do so if
 953  * necessary.
 954  */
 955 static void start_stop_decoders(struct sched *s)
 956 {
 957         int i;
 958
 959         FOR_EACH_SLOT(i)
 960                 try_to_close_slot(i);
 961         if (audiod_status != AUDIOD_ON || !stat_task->playing)
 962                 return kill_all_decoders(-E_NOT_PLAYING);
 963         open_current_receiver(s);
 964         FOR_EACH_SLOT(i) {
 965                 struct slot_info *sl = &slot[i];
 966                 struct audio_format_info *a;
 967                 struct timeval diff;
 968
 969                 if (sl->format < 0)
 970                         continue;
 971                 a = &afi[sl->format];
 972                 if (!sl->receiver_node)
 973                         continue;
 974                 if ((!a->num_filters || sl->fc) && sl->wng)
 975                         continue; /* everything already started */
 976                 if (!a->num_filters) {
 977                         if (sl->receiver_node->loaded && !sl->wng) {
 978                                 open_writers(i);
 979                         }
 980                         continue;
 981                 }
 982                 if (sl->receiver_node->loaded && !sl->fc) {
 983                         open_filters(i);
 984                         continue;
 985                 }
 986                 if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
 987                         continue;
 988                 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
 989                         open_writers(i);
 990                         continue;
 991                 }
 992                 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
 993                 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
 994                         s->timeout = diff;
 995                 }
 996         }
 997 }
 998
 999
1000 /* restart the client task if necessary */
1001 static void status_pre_select(struct sched *s, struct task *t)
1002 {
1003         struct status_task *st = container_of(t, struct status_task, task);
1004
1005         if (audiod_status == AUDIOD_OFF) {
1006                 if (!st->ct)
1007                         goto out;
1008                 if (st->ct->task.error >= 0) {
1009                         st->ct->task.error = -E_AUDIOD_OFF;
1010                         goto out;
1011                 }
1012                 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1013                         goto out;
1014                 close_stat_pipe();
1015                 st->clock_diff_count = conf.clock_diff_count_arg;
1016                 goto out;
1017         }
1018         if (st->ct) {
1019                 unsigned bytes_left;
1020                 if (st->ct->task.error < 0) {
1021                         if (st->ct->task.error != -E_TASK_UNREGISTERED)
1022                                 goto out;
1023                         close_stat_pipe();
1024                         goto out;
1025                 }
1026                 if (st->ct->status != CL_RECEIVING)
1027                         goto out;
1028                 bytes_left = for_each_line(st->ct->buf, st->ct->loaded,
1029                         &check_stat_line, NULL);
1030                 if (st->ct->loaded != bytes_left) {
1031                         st->last_status_read = *now;
1032                         st->ct->loaded = bytes_left;
1033                 } else {
1034                         struct timeval diff;
1035                         tv_diff(now, &st->last_status_read, &diff);
1036                         if (diff.tv_sec > 61)
1037                                 st->ct->task.error = -E_STATUS_TIMEOUT;
1038                 }
1039                 goto out;
1040         }
1041         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1042                 goto out;
1043         if (st->clock_diff_count) { /* get status only one time */
1044                 char *argv[] = {"audiod", "stat", "1", NULL};
1045                 int argc = 3;
1046                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1047                 st->clock_diff_count--;
1048                 client_open(argc, argv, &st->ct);
1049                 set_stat_task_restart_barrier(2);
1050
1051         } else {
1052                 char *argv[] = {"audiod", "stat", NULL};
1053                 int argc = 2;
1054                 client_open(argc, argv, &st->ct);
1055                 set_stat_task_restart_barrier(5);
1056         }
1057         free(stat_item_values[SI_BASENAME]);
1058         stat_item_values[SI_BASENAME] = make_message(
1059                 "%s: no connection to para_server\n",
1060                 status_item_list[SI_BASENAME]);
1061         stat_client_write(stat_item_values[SI_BASENAME],
1062                 SI_BASENAME);
1063         st->last_status_read = *now;
1064 out:
1065         start_stop_decoders(s);
1066 }
1067
1068 static void init_status_task(struct status_task *st)
1069 {
1070         memset(st, 0, sizeof(struct status_task));
1071         st->task.pre_select = status_pre_select;
1072         st->sa_time_diff_sign = 1;
1073         st->clock_diff_count = conf.clock_diff_count_arg;
1074         st->current_audio_format_num = -1;
1075         sprintf(st->task.status, "status task");
1076 }
1077
1078 static void set_initial_status(void)
1079 {
1080         audiod_status = AUDIOD_ON;
1081         if (!conf.mode_given)
1082                 return;
1083         if (!strcmp(conf.mode_arg, "sb")) {
1084                 audiod_status = AUDIOD_STANDBY;
1085                 return;
1086         }
1087         if (!strcmp(conf.mode_arg, "off")) {
1088                 audiod_status = AUDIOD_OFF;
1089                 return;
1090         }
1091         if (strcmp(conf.mode_arg, "on"))
1092                 PARA_WARNING_LOG("invalid mode\n");
1093 }
1094
1095 __noreturn static void print_help_and_die(void)
1096 {
1097         int d = conf.detailed_help_given;
1098         const char **p = d? audiod_args_info_detailed_help
1099                 : audiod_args_info_help;
1100
1101         printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1102                 AUDIOD_CMDLINE_PARSER_VERSION);
1103         printf_or_die("%s\n\n", audiod_args_info_usage);
1104         for (; *p; p++)
1105                 printf_or_die("%s\n", *p);
1106         print_receiver_helps(d);
1107         print_filter_helps(d);
1108         print_writer_helps(d);
1109         exit(0);
1110 }
1111
1112
1113 /**
1114  * the main function of para_audiod
1115  *
1116  * \param argc usual argument count
1117  * \param argv usual argument vector
1118  *
1119  * \return EXIT_SUCCESS or EXIT_FAILURE
1120  *
1121  * \sa para_audiod(1)
1122  * */
1123 int main(int argc, char *argv[])
1124 {
1125         int ret, i;
1126         static struct sched s;
1127         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1128         struct audiod_cmdline_parser_params params = {
1129                 .override = 0,
1130                 .initialize = 1,
1131                 .check_required = 0,
1132                 .check_ambiguity = 0,
1133                 .print_errors = 1
1134         };
1135
1136         valid_fd_012();
1137         audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1138         HANDLE_VERSION_FLAG("audiod", conf);
1139         drop_privileges_or_die(conf.user_arg, conf.group_arg);
1140         parse_config_or_die();
1141         if (conf.logfile_given)
1142                 logfile = open_log(conf.logfile_arg);
1143         i = init_stream_io();
1144         if (conf.help_given || conf.detailed_help_given)
1145                 print_help_and_die();
1146         if (i < 0) {
1147                 PARA_EMERG_LOG("init stream io error: %s\n", para_strerror(-i));
1148                 exit(EXIT_FAILURE);
1149         }
1150         log_welcome("para_audiod", conf.loglevel_arg);
1151         server_uptime(UPTIME_SET);
1152         set_initial_status();
1153         FOR_EACH_SLOT(i)
1154                 clear_slot(i);
1155         init_grabbing();
1156         setup_signal_handling();
1157         signal_setup_default(sig_task);
1158
1159         init_status_task(stat_task);
1160         init_command_task(cmd_task);
1161
1162         if (conf.daemon_given)
1163                 daemon_init();
1164
1165         register_task(&sig_task->task);
1166         register_task(&cmd_task->task);
1167         register_task(&stat_task->task);
1168         s.default_timeout.tv_sec = 0;
1169         s.default_timeout.tv_usec = 99 * 1000;
1170         ret = schedule(&s);
1171
1172         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1173         return EXIT_FAILURE;
1174 }