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 struct audio_format_info afi[NUM_AUDIO_FORMATS];
  87
  88 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
  89
  90 static struct status_task status_task_struct;
  91
  92 /**
  93  * the task that calls the status command of para_server
  94  *
  95  * \sa struct status_task
  96  */
  97 static struct status_task *stat_task = &status_task_struct;
  98 static struct timeval initial_delay_barrier;
  99
 100 /**
 101  * the task for handling audiod commands
 102  *
 103  * \sa struct task, struct sched
 104  */
 105 struct command_task {
 106         /** the local listening socket */
 107         int fd;
 108         /** the associated task structure */
 109         struct task task;
 110 };
 111
 112 /** iterate over all supported audio formats */
 113 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 114
 115 /**
 116  * get the audio format number
 117  * \param name the name of the audio format
 118  *
 119  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 120  * \a name is not a supported audio format.
 121  */
 122 int get_audio_format_num(char *name)
 123 {
 124         int i;
 125
 126         while (para_isspace(*name))
 127                 name++;
 128         FOR_EACH_AUDIO_FORMAT(i)
 129                 if (!strcmp(name, audio_formats[i]))
 130                         return i;
 131         return -E_UNSUPPORTED_AUDIO_FORMAT;
 132 }
 133
 134 char *get_time_string(struct timeval *newest_stime)
 135 {
 136         struct timeval diff, adj_stream_start, tmp;
 137         int total = 0, use_server_time = 1,
 138                 length_seconds = stat_task->length_seconds;
 139
 140         if (!stat_task->playing) {
 141                 if (length_seconds)
 142                         return NULL;
 143                 return make_message("%s:\n", status_item_list[SI_PLAY_TIME]);
 144         }
 145         if (audiod_status == AUDIOD_OFF)
 146                 goto out;
 147         if (stat_task->sa_time_diff_sign > 0)
 148                 tv_diff(&stat_task->server_stream_start, &stat_task->sa_time_diff,
 149                         &adj_stream_start);
 150         else
 151                 tv_add(&stat_task->server_stream_start, &stat_task->sa_time_diff,
 152                         &adj_stream_start);
 153         tmp = adj_stream_start;
 154         if (newest_stime && audiod_status == AUDIOD_ON) {
 155                 tv_diff(newest_stime, &adj_stream_start, &diff);
 156                 if (tv2ms(&diff) < 5000) {
 157                         tmp = *newest_stime;
 158                         use_server_time = 0;
 159                 }
 160         }
 161         tv_diff(now, &tmp, &diff);
 162         total = diff.tv_sec + stat_task->offset_seconds;
 163         if (total > length_seconds)
 164                 total = length_seconds;
 165         if (total < 0)
 166                 total = 0;
 167 out:
 168         return make_message(
 169                 "%s: %s%d:%02d [%d:%02d] (%d%%/%d:%02d)\n",
 170                 status_item_list[SI_PLAY_TIME],
 171                 use_server_time? "~" : "",
 172                 total / 60,
 173                 total % 60,
 174                 (length_seconds - total) / 60,
 175                 (length_seconds - total) % 60,
 176                 length_seconds? (total * 100 + length_seconds / 2) /
 177                         length_seconds : 0,
 178                 length_seconds / 60,
 179                 length_seconds % 60
 180         );
 181 }
 182
 183 static int want_colors(void)
 184 {
 185         if (conf.color_arg == color_arg_no)
 186                 return 0;
 187         if (conf.color_arg == color_arg_yes)
 188                 return 1;
 189         if (conf.logfile_given)
 190                 return 0;
 191         return isatty(STDERR_FILENO);
 192 }
 193
 194 static void parse_config_or_die(void)
 195 {
 196         int ret;
 197         char *config_file;
 198         struct audiod_cmdline_parser_params params = {
 199                 .override = 0,
 200                 .initialize = 0,
 201                 .check_required = 1,
 202                 .check_ambiguity = 0,
 203                 .print_errors = 1
 204         };
 205
 206         if (conf.config_file_given)
 207                 config_file = para_strdup(conf.config_file_arg);
 208         else {
 209                 char *home = para_homedir();
 210                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 211                 free(home);
 212         }
 213         ret = file_exists(config_file);
 214         if (conf.config_file_given && !ret) {
 215                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 216                 goto err;
 217         }
 218         if (ret)
 219                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 220         free(config_file);
 221         daemon_set_loglevel(conf.loglevel_arg);
 222         return;
 223 err:
 224         free(config_file);
 225         exit(EXIT_FAILURE);
 226 }
 227
 228 static void setup_signal_handling(void)
 229 {
 230         sig_task->fd = para_signal_init();
 231         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 232         para_install_sighandler(SIGINT);
 233         para_install_sighandler(SIGTERM);
 234         para_install_sighandler(SIGHUP);
 235         signal(SIGPIPE, SIG_IGN);
 236 }
 237
 238 static void clear_slot(int slot_num)
 239 {
 240         struct slot_info *s = &slot[slot_num];
 241
 242         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 243         memset(s, 0, sizeof(struct slot_info));
 244         s->format = -1;
 245 }
 246
 247 static void close_receiver(int slot_num)
 248 {
 249         struct slot_info *s = &slot[slot_num];
 250         struct audio_format_info *a;
 251
 252         if (s->format < 0 || !s->receiver_node)
 253                 return;
 254         a = &afi[s->format];
 255         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 256                 audio_formats[s->format], slot_num);
 257         a->receiver->close(s->receiver_node);
 258         free(s->receiver_node);
 259         s->receiver_node = NULL;
 260 }
 261
 262 static void kill_all_decoders(int error)
 263 {
 264         int i;
 265
 266         FOR_EACH_SLOT(i) {
 267                 struct slot_info *s = &slot[i];
 268                 if (s->wng && s->wng->task.error >= 0) {
 269                         PARA_INFO_LOG("deactivating wng in slot %d\n",
 270                                 i);
 271                         s->wng->task.error = error;
 272                 }
 273                 if (s->fc && s->fc->task.error >= 0) {
 274                         PARA_INFO_LOG("deactivatimg filter chain in slot %d\n", i);
 275                         s->fc->task.error = error;
 276                 }
 277                 if (s->receiver_node && s->receiver_node->task.error >= 0) {
 278                         PARA_INFO_LOG("deactivating receiver_node in slot %d\n", i);
 279                         s->receiver_node->task.error = error;
 280                 }
 281         }
 282 }
 283
 284 static int get_empty_slot(void)
 285 {
 286         int i;
 287         struct slot_info *s;
 288
 289         FOR_EACH_SLOT(i) {
 290                 s = &slot[i];
 291                 if (s->format < 0) {
 292                         clear_slot(i);
 293                         return i;
 294                 }
 295                 if (s->wng || s->receiver_node || s->fc)
 296                         continue;
 297                 clear_slot(i);
 298                 return i;
 299         }
 300         return -E_NO_MORE_SLOTS;
 301 }
 302
 303 /**
 304  * get the number of filters
 305  *
 306  * \param audio_format_num the number identifying the audio format
 307  *
 308  * \return the number of filters for the given audio format
 309  *
 310  * \sa struct filter;
 311  */
 312 int num_filters(int audio_format_num)
 313 {
 314         return afi[audio_format_num].num_filters;
 315 }
 316
 317 static void open_filters(int slot_num)
 318 {
 319         struct slot_info *s = &slot[slot_num];
 320         struct audio_format_info *a = &afi[s->format];
 321         struct filter_node *fn;
 322         int nf = a->num_filters;
 323         int i;
 324
 325         s->fc = NULL;
 326         if (!nf)
 327                 return;
 328         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 329         s->fc = para_calloc(sizeof(struct filter_chain));
 330         s->fc->filter_nodes = para_malloc(nf * sizeof(struct filter_node));
 331         s->fc->inbuf = s->receiver_node->buf;
 332         s->fc->in_loaded = &s->receiver_node->loaded;
 333         s->fc->input_error = &s->receiver_node->task.error;
 334         s->fc->task.pre_select = filter_pre_select;
 335         s->fc->task.post_select = NULL;
 336         s->fc->task.error = 0;
 337         s->fc->num_filters = nf;
 338
 339         s->receiver_node->output_error = &s->fc->task.error;
 340         sprintf(s->fc->task.status, "filter chain");
 341         FOR_EACH_FILTER_NODE(fn, s->fc, i) {
 342                 struct filter *f = filters + a->filter_nums[i];
 343                 fn->filter_num = a->filter_nums[i];
 344                 fn->conf = a->filter_conf[i];
 345                 fn->fc = s->fc;
 346                 fn->loaded = 0;
 347                 INIT_LIST_HEAD(&fn->callbacks);
 348                 f->open(fn);
 349                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 350                         audio_formats[s->format], i,  nf, f->name, slot_num);
 351                 s->fc->outbuf = fn->buf;
 352                 s->fc->out_loaded = &fn->loaded;
 353         }
 354         register_task(&s->fc->task);
 355 }
 356
 357 static void open_writers(int slot_num)
 358 {
 359         int ret, i;
 360         struct slot_info *s = &slot[slot_num];
 361         struct audio_format_info *a = &afi[s->format];
 362
 363         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 364         if (!a->num_writers)
 365                 s->wng = setup_default_wng();
 366         else
 367                 s->wng = wng_new(a->num_writers);
 368         if (s->fc) {
 369                 s->wng->buf = s->fc->outbuf;
 370                 s->wng->loaded = s->fc->out_loaded;
 371                 s->wng->input_error = &s->fc->task.error;
 372                 s->wng->channels = &s->fc->channels;
 373                 s->wng->samplerate = &s->fc->samplerate;
 374                 s->fc->output_error = &s->wng->task.error;
 375                 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
 376         } else {
 377                 s->wng->buf = s->receiver_node->buf;
 378                 s->wng->loaded = &s->receiver_node->loaded;
 379                 s->wng->input_error = &s->receiver_node->task.error;
 380         }
 381         for (i = 0; i < a->num_writers; i++) {
 382                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 383                 s->wng->writer_nodes[i].writer = a->writers[i];
 384         }
 385         ret = wng_open(s->wng);
 386         if (ret < 0) {
 387                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 388                 return;
 389         }
 390         s->wstime = *now;
 391         activate_inactive_grab_clients(slot_num, s->format, s->fc);
 392 }
 393
 394 static int open_receiver(int format)
 395 {
 396         struct audio_format_info *a = &afi[format];
 397         struct slot_info *s;
 398         int ret, slot_num;
 399         struct receiver_node *rn;
 400         const struct timeval restart_delay = {2, 0};
 401
 402         ret = get_empty_slot();
 403         if (ret < 0)
 404                 goto err;
 405         slot_num = ret;
 406         s = &slot[slot_num];
 407         s->format = format;
 408         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 409         rn = s->receiver_node;
 410         rn->receiver = a->receiver;
 411         rn->conf = a->receiver_conf;
 412         ret = a->receiver->open(s->receiver_node);
 413         if (ret < 0) {
 414                 free(s->receiver_node);
 415                 s->receiver_node = NULL;
 416                 goto err;
 417         }
 418         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 419                 audio_formats[s->format], a->receiver->name, slot_num);
 420         rn->task.pre_select = a->receiver->pre_select;
 421         rn->task.post_select = a->receiver->post_select;
 422         sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
 423         register_task(&rn->task);
 424         ret = 1;
 425 err:
 426         if (ret < 0)
 427                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 428         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 429         return ret;
 430 }
 431
 432 static int receiver_running(int format)
 433 {
 434         int i;
 435
 436         FOR_EACH_SLOT(i) {
 437                 struct slot_info *s = &slot[i];
 438                 if (s->format == format && s->receiver_node)
 439                         return 1;
 440         }
 441         return 0;
 442 }
 443
 444 static int open_current_receiver(struct sched *s)
 445 {
 446         struct timeval diff;
 447         int cafn = stat_task->current_audio_format_num;
 448
 449         if (cafn < 0 || !stat_task->ct)
 450                 return 0;
 451         if (receiver_running(cafn))
 452                 return 0;
 453         if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
 454                 s->timeout = diff;
 455                 return 0;
 456         }
 457         return open_receiver(cafn) < 0? 0 : 1;
 458 }
 459
 460 static unsigned compute_time_diff(const struct timeval *status_time)
 461 {
 462         struct timeval tmp, diff;
 463         static unsigned count;
 464         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 465         const struct timeval max_deviation = {0, 500 * 1000};
 466         const int time_smooth = 5;
 467
 468         if (!status_time)
 469                 return count;
 470         sign = tv_diff(status_time, now, &diff);
 471 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 472 //                      sign, sa_time_diff_sign);
 473         if (!count) {
 474                 sa_time_diff_sign = sign;
 475                 stat_task->sa_time_diff = diff;
 476                 count++;
 477                 goto out;
 478         }
 479         if (count > 5) {
 480                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 481                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 482                         PARA_WARNING_LOG("time diff jump: %lims\n",
 483                                 s * tv2ms(&tmp));
 484         }
 485         count++;
 486         sa_time_diff_sign = tv_convex_combination(
 487                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 488                 count > 10? sign : sign * time_smooth, &diff,
 489                 &tmp);
 490         stat_task->sa_time_diff = tmp;
 491         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 492                 sign > 0? "+" : "-",
 493                 tv2ms(&diff),
 494                 sa_time_diff_sign ? "+" : "-",
 495                 tv2ms(&stat_task->sa_time_diff)
 496         );
 497 out:
 498         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 499         return count;
 500 }
 501
 502 static int check_stat_line(char *line, __a_unused void *data)
 503 {
 504         int itemnum;
 505         size_t ilen = 0;
 506         long unsigned sec, usec;
 507         char *tmp;
 508
 509         //PARA_INFO_LOG("line: %s\n", line);
 510         if (!line)
 511                 return 1;
 512         itemnum = stat_line_valid(line);
 513         if (itemnum < 0) {
 514                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 515                 return 1;
 516         }
 517         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 518                 return 1;
 519         tmp = make_message("%s\n", line);
 520         stat_client_write(tmp, itemnum);
 521         free(tmp);
 522         free(stat_item_values[itemnum]);
 523         stat_item_values[itemnum] = para_strdup(line);
 524         ilen = strlen(status_item_list[itemnum]);
 525         switch (itemnum) {
 526         case SI_STATUS:
 527                 stat_task->playing = strstr(line, "playing")? 1 : 0;
 528                 PARA_INFO_LOG("stat task playing: %d\n", stat_task->playing);
 529                 break;
 530         case SI_OFFSET:
 531                 stat_task->offset_seconds = atoi(line + ilen + 1);
 532                 break;
 533         case SI_SECONDS_TOTAL:
 534                 stat_task->length_seconds = atoi(line + ilen + 1);
 535                 break;
 536         case SI_STREAM_START:
 537                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 538                         struct timeval a_start, delay;
 539                         delay.tv_sec = conf.stream_delay_arg / 1000;
 540                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 541                         stat_task->server_stream_start.tv_sec = sec;
 542                         stat_task->server_stream_start.tv_usec = usec;
 543                         if (compute_time_diff(NULL) > 2) {
 544                                 if (stat_task->sa_time_diff_sign < 0)
 545                                         tv_add(&stat_task->server_stream_start,
 546                                                 &stat_task->sa_time_diff, &a_start);
 547                                 else
 548                                         tv_diff(&stat_task->server_stream_start,
 549                                                 &stat_task->sa_time_diff, &a_start);
 550                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 551                         }
 552                 }
 553                 break;
 554         case SI_CURRENT_TIME:
 555                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 556                         struct timeval tv = {sec, usec};
 557                         compute_time_diff(&tv);
 558                 }
 559                 break;
 560         case SI_FORMAT:
 561                 stat_task->current_audio_format_num = get_audio_format_num(
 562                         line + ilen + 1);
 563         }
 564         return 1;
 565 }
 566
 567 static int parse_stream_command(const char *txt, char **cmd)
 568 {
 569         char *p = strchr(txt, ':');
 570         int i;
 571
 572         if (!p)
 573                 return -E_MISSING_COLON;
 574         p++;
 575         FOR_EACH_AUDIO_FORMAT(i) {
 576                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 577                         continue;
 578                 *cmd = p;
 579                 return i;
 580         }
 581         return -E_UNSUPPORTED_AUDIO_FORMAT;
 582 }
 583
 584 static int add_filter(int format, char *cmdline)
 585 {
 586         struct audio_format_info *a = &afi[format];
 587         int filter_num, nf = a->num_filters;
 588
 589         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 590         if (filter_num < 0)
 591                 return filter_num;
 592         a->filter_nums[nf] = filter_num;
 593         a->num_filters++;
 594         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 595                 filters[filter_num].name);
 596         return filter_num;
 597 }
 598
 599 static int parse_writer_args(void)
 600 {
 601         int i, ret, nw;
 602         char *cmd;
 603         struct audio_format_info *a;
 604
 605         nw = PARA_MAX(1U, conf.writer_given);
 606         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 607         FOR_EACH_AUDIO_FORMAT(i) {
 608                 a = &afi[i];
 609                 a->writer_conf = para_malloc(nw * sizeof(void *));
 610                 a->writers = para_malloc(nw * sizeof(struct writer *));
 611                 a->num_writers = 0;
 612         }
 613         for (i = 0; i < conf.writer_given; i++) {
 614                 void *wconf;
 615                 int writer_num;
 616                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 617                 if (ret < 0)
 618                         goto out;
 619                 a = &afi[ret];
 620                 nw = a->num_writers;
 621                 wconf = check_writer_arg(cmd, &writer_num);
 622                 if (!wconf) {
 623                         ret = writer_num;
 624                         goto out;
 625                 }
 626                 a->writers[nw] = &writers[writer_num];
 627                 a->writer_conf[nw] = wconf;
 628                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 629                         nw, writer_names[writer_num]);
 630                 a->num_writers++;
 631         }
 632         ret = 1;
 633 out:
 634         return ret;
 635 }
 636
 637 static int parse_receiver_args(void)
 638 {
 639         int i, ret, receiver_num;
 640         char *cmd = NULL;
 641         struct audio_format_info *a;
 642
 643         for (i = conf.receiver_given - 1; i >= 0; i--) {
 644                 char *arg = conf.receiver_arg[i];
 645                 char *recv_arg = strchr(arg, ':');
 646                 ret = -E_MISSING_COLON;
 647                 if (!recv_arg)
 648                         goto out;
 649                 *recv_arg = '\0';
 650                 recv_arg++;
 651                 ret = get_audio_format_num(arg);
 652                 if (ret < 0)
 653                         goto out;
 654                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 655                 if (!afi[ret].receiver_conf) {
 656                         ret = -E_RECV_SYNTAX;
 657                         goto out;
 658                 }
 659                 afi[ret].receiver = &receivers[receiver_num];
 660         }
 661         /* use the first available receiver with no arguments
 662          * for those audio formats for which no receiver
 663          * was specified
 664          */
 665         cmd = para_strdup(receivers[0].name);
 666         FOR_EACH_AUDIO_FORMAT(i) {
 667                 a = &afi[i];
 668                 if (a->receiver_conf)
 669                         continue;
 670                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 671                 if (!a->receiver_conf)
 672                         return -E_RECV_SYNTAX;
 673                 a->receiver = &receivers[receiver_num];
 674         }
 675         ret = 1;
 676 out:
 677         free(cmd);
 678         return ret;
 679 }
 680
 681 static int init_default_filters(void)
 682 {
 683         int i, ret = 1;
 684
 685         FOR_EACH_AUDIO_FORMAT(i) {
 686                 struct audio_format_info *a = &afi[i];
 687                 char *tmp;
 688                 int j;
 689
 690                 if (a->num_filters)
 691                         continue; /* no default -- nothing to to */
 692                 /* add "dec" to audio format name */
 693                 tmp = make_message("%sdec", audio_formats[i]);
 694                 for (j = 0; filters[j].name; j++)
 695                         if (!strcmp(tmp, filters[j].name))
 696                                 break;
 697                 free(tmp);
 698                 ret = -E_UNSUPPORTED_FILTER;
 699                 if (!filters[j].name)
 700                         goto out;
 701                 tmp = para_strdup(filters[j].name);
 702                 ret = add_filter(i, tmp);
 703                 free(tmp);
 704                 if (ret < 0)
 705                         goto out;
 706                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 707                         filters[j].name);
 708         }
 709 out:
 710         return ret;
 711 }
 712
 713 static int parse_filter_args(void)
 714 {
 715         int i, ret, nf;
 716
 717         nf = PARA_MAX(1U, conf.filter_given);
 718         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 719         FOR_EACH_AUDIO_FORMAT(i) {
 720                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 721                 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
 722         }
 723         if (!conf.no_default_filters_given)
 724                 return init_default_filters();
 725         for (i = 0; i < conf.filter_given; i++) {
 726                 char *arg = conf.filter_arg[i];
 727                 char *filter_name = strchr(arg, ':');
 728                 ret = -E_MISSING_COLON;
 729                 if (!filter_name)
 730                         goto out;
 731                 *filter_name = '\0';
 732                 filter_name++;
 733                 ret = get_audio_format_num(arg);
 734                 if (ret < 0)
 735                         goto out;
 736                 ret = add_filter(ret, filter_name);
 737                 if (ret < 0)
 738                         goto out;
 739         }
 740         ret = init_default_filters(); /* use default values for the rest */
 741 out:
 742         return ret;
 743 }
 744
 745 static int parse_stream_args(void)
 746 {
 747         int ret;
 748
 749         ret = parse_receiver_args();
 750         if (ret < 0)
 751                 return ret;
 752         ret = parse_filter_args();
 753         if (ret < 0)
 754                 return ret;
 755         ret = parse_writer_args();
 756         if (ret < 0)
 757                 return ret;
 758         return 1;
 759 }
 760
 761 /* does not unlink socket on errors */
 762 static int audiod_get_socket(void)
 763 {
 764         struct sockaddr_un unix_addr;
 765         int ret, fd;
 766
 767         if (conf.socket_given)
 768                 socket_name = para_strdup(conf.socket_arg);
 769         else {
 770                 char *hn = para_hostname();
 771                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 772                         hn);
 773                 free(hn);
 774         }
 775         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 776         if (conf.force_given)
 777                 unlink(socket_name);
 778         ret = create_local_socket(socket_name, &unix_addr,
 779                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 780         if (ret < 0)
 781                 goto err;
 782         fd = ret;
 783         if (listen(fd , 5) < 0) {
 784                 ret = -ERRNO_TO_PARA_ERROR(errno);
 785                 goto err;
 786         }
 787         ret = mark_fd_nonblocking(fd);
 788         if (ret < 0)
 789                 goto err;
 790         return fd;
 791 err:
 792         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 793         exit(EXIT_FAILURE);
 794 }
 795
 796 static void signal_pre_select(struct sched *s, struct task *t)
 797 {
 798         struct signal_task *st = container_of(t, struct signal_task, task);
 799         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 800 }
 801
 802 static void signal_post_select(struct sched *s, struct task *t)
 803 {
 804         struct signal_task *st = container_of(t, struct signal_task, task);
 805
 806         if (!FD_ISSET(st->fd, &s->rfds))
 807                 return;
 808
 809         st->signum = para_next_signal();
 810         switch (st->signum) {
 811         case SIGINT:
 812         case SIGTERM:
 813         case SIGHUP:
 814                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 815                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 816         }
 817 }
 818
 819 static void signal_setup_default(struct signal_task *st)
 820 {
 821         st->task.pre_select = signal_pre_select;
 822         st->task.post_select = signal_post_select;
 823         sprintf(st->task.status, "signal task");
 824 }
 825
 826 static void command_pre_select(struct sched *s, struct task *t)
 827 {
 828         struct command_task *ct = container_of(t, struct command_task, task);
 829         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 830 }
 831
 832 static void command_post_select(struct sched *s, struct task *t)
 833 {
 834         int ret;
 835         struct command_task *ct = container_of(t, struct command_task, task);
 836
 837         audiod_status_dump();
 838         if (!FD_ISSET(ct->fd, &s->rfds))
 839                 return;
 840         ret = handle_connect(ct->fd);
 841         if (ret < 0)
 842                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 843 }
 844
 845 static void init_command_task(struct command_task *ct)
 846 {
 847         ct->task.pre_select = command_pre_select;
 848         ct->task.post_select = command_post_select;
 849         ct->task.error = 0;
 850         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 851         sprintf(ct->task.status, "command task");
 852 }
 853
 854 static void close_stat_pipe(void)
 855 {
 856         int i;
 857
 858         if (!stat_task->ct)
 859                 return;
 860         client_close(stat_task->ct);
 861         stat_task->ct = NULL;
 862         FOR_EACH_STATUS_ITEM(i) {
 863                 free(stat_item_values[i]);
 864                 stat_item_values[i] = NULL;
 865         }
 866         dump_empty_status();
 867         stat_task->length_seconds = 0;
 868         stat_task->offset_seconds = 0;
 869         audiod_status_dump();
 870         stat_task->playing = 0;
 871 }
 872
 873 /**
 874  * close the connection to para_server and exit
 875  *
 876  * \param status the exit status which is passed to exit(3)
 877  * \param msg the log message
 878  *
 879  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
 880  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
 881  * EXIT_FAILURE.
 882  *
 883  * \sa exit(3)
 884  */
 885 void __noreturn clean_exit(int status, const char *msg)
 886 {
 887         PARA_EMERG_LOG("%s\n", msg);
 888         if (socket_name)
 889                 unlink(socket_name);
 890         close_stat_pipe();
 891         exit(status);
 892 }
 893
 894 /* avoid busy loop if server is down */
 895 static void set_stat_task_restart_barrier(unsigned seconds)
 896 {
 897         struct timeval delay = {seconds, 0};
 898         tv_add(now, &delay, &stat_task->restart_barrier);
 899 }
 900
 901 static void try_to_close_slot(int slot_num)
 902 {
 903         struct slot_info *s = &slot[slot_num];
 904
 905         if (s->format < 0)
 906                 return;
 907         if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
 908                 return;
 909         if (s->fc && s->fc->task.error != -E_TASK_UNREGISTERED)
 910                 return;
 911         if (s->wng && s->wng->task.error != -E_TASK_UNREGISTERED)
 912                 return;
 913         PARA_INFO_LOG("closing slot %d\n", slot_num);
 914         wng_close(s->wng);
 915         close_filters(s->fc);
 916         free(s->fc);
 917         close_receiver(slot_num);
 918         clear_slot(slot_num);
 919 }
 920
 921 /*
 922  * Check if any receivers/filters/writers need to be started and do so if
 923  * necessary.
 924  */
 925 static void start_stop_decoders(struct sched *s)
 926 {
 927         int i;
 928
 929         FOR_EACH_SLOT(i)
 930                 try_to_close_slot(i);
 931         if (audiod_status != AUDIOD_ON || !stat_task->playing)
 932                 return kill_all_decoders(-E_NOT_PLAYING);
 933         open_current_receiver(s);
 934         FOR_EACH_SLOT(i) {
 935                 struct slot_info *sl = &slot[i];
 936                 struct audio_format_info *a;
 937                 struct timeval diff;
 938
 939                 if (sl->format < 0)
 940                         continue;
 941                 a = &afi[sl->format];
 942                 if (!sl->receiver_node)
 943                         continue;
 944                 if ((!a->num_filters || sl->fc) && sl->wng)
 945                         continue; /* everything already started */
 946                 if (!a->num_filters) {
 947                         if (sl->receiver_node->loaded && !sl->wng) {
 948                                 open_writers(i);
 949                         }
 950                         continue;
 951                 }
 952                 if (sl->receiver_node->loaded && !sl->fc) {
 953                         open_filters(i);
 954                         continue;
 955                 }
 956                 if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
 957                         continue;
 958                 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
 959                         open_writers(i);
 960                         continue;
 961                 }
 962                 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
 963                 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
 964                         s->timeout = diff;
 965                 }
 966         }
 967 }
 968
 969
 970 /* restart the client task if necessary */
 971 static void status_pre_select(struct sched *s, struct task *t)
 972 {
 973         struct status_task *st = container_of(t, struct status_task, task);
 974
 975         if (audiod_status == AUDIOD_OFF) {
 976                 if (!st->ct)
 977                         goto out;
 978                 if (st->ct->task.error >= 0) {
 979                         st->ct->task.error = -E_AUDIOD_OFF;
 980                         goto out;
 981                 }
 982                 if (st->ct->task.error != -E_TASK_UNREGISTERED)
 983                         goto out;
 984                 close_stat_pipe();
 985                 st->clock_diff_count = conf.clock_diff_count_arg;
 986                 goto out;
 987         }
 988         if (st->ct) {
 989                 unsigned bytes_left;
 990                 if (st->ct->task.error < 0) {
 991                         if (st->ct->task.error != -E_TASK_UNREGISTERED)
 992                                 goto out;
 993                         close_stat_pipe();
 994                         goto out;
 995                 }
 996                 if (st->ct->status != CL_RECEIVING)
 997                         goto out;
 998                 bytes_left = for_each_line(st->ct->buf, st->ct->loaded,
 999                         &check_stat_line, NULL);
1000                 if (st->ct->loaded != bytes_left) {
1001                         st->last_status_read = *now;
1002                         st->ct->loaded = bytes_left;
1003                 } else {
1004                         struct timeval diff;
1005                         tv_diff(now, &st->last_status_read, &diff);
1006                         if (diff.tv_sec > 61)
1007                                 st->ct->task.error = -E_STATUS_TIMEOUT;
1008                 }
1009                 goto out;
1010         }
1011         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1012                 goto out;
1013         if (st->clock_diff_count) { /* get status only one time */
1014                 char *argv[] = {"audiod", "stat", "1", NULL};
1015                 int argc = 3;
1016                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1017                 st->clock_diff_count--;
1018                 client_open(argc, argv, &st->ct, NULL);
1019                 set_stat_task_restart_barrier(2);
1020
1021         } else {
1022                 char *argv[] = {"audiod", "stat", NULL};
1023                 int argc = 2;
1024                 client_open(argc, argv, &st->ct, NULL);
1025                 set_stat_task_restart_barrier(5);
1026         }
1027         free(stat_item_values[SI_BASENAME]);
1028         stat_item_values[SI_BASENAME] = make_message(
1029                 "%s: no connection to para_server\n",
1030                 status_item_list[SI_BASENAME]);
1031         stat_client_write(stat_item_values[SI_BASENAME],
1032                 SI_BASENAME);
1033         st->last_status_read = *now;
1034 out:
1035         start_stop_decoders(s);
1036 }
1037
1038 static void init_status_task(struct status_task *st)
1039 {
1040         memset(st, 0, sizeof(struct status_task));
1041         st->task.pre_select = status_pre_select;
1042         st->sa_time_diff_sign = 1;
1043         st->clock_diff_count = conf.clock_diff_count_arg;
1044         st->current_audio_format_num = -1;
1045         sprintf(st->task.status, "status task");
1046 }
1047
1048 static void set_initial_status(void)
1049 {
1050         audiod_status = AUDIOD_ON;
1051         if (!conf.mode_given)
1052                 return;
1053         if (!strcmp(conf.mode_arg, "sb")) {
1054                 audiod_status = AUDIOD_STANDBY;
1055                 return;
1056         }
1057         if (!strcmp(conf.mode_arg, "off")) {
1058                 audiod_status = AUDIOD_OFF;
1059                 return;
1060         }
1061         if (strcmp(conf.mode_arg, "on"))
1062                 PARA_WARNING_LOG("invalid mode\n");
1063 }
1064
1065 __noreturn static void print_help_and_die(void)
1066 {
1067         int d = conf.detailed_help_given;
1068         const char **p = d? audiod_args_info_detailed_help
1069                 : audiod_args_info_help;
1070
1071         printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1072                 AUDIOD_CMDLINE_PARSER_VERSION);
1073         printf_or_die("%s\n\n", audiod_args_info_usage);
1074         for (; *p; p++)
1075                 printf_or_die("%s\n", *p);
1076         print_receiver_helps(d);
1077         print_filter_helps(d);
1078         print_writer_helps(d);
1079         exit(0);
1080 }
1081
1082 static void init_colors_or_die(void)
1083 {
1084         int ret, i;
1085
1086         if (!want_colors())
1087                 return;
1088         daemon_set_default_log_colors();
1089         daemon_set_flag(DF_COLOR_LOG);
1090         for (i = 0; i < conf.log_color_given; i++) {
1091                 ret = daemon_set_log_color(conf.log_color_arg[i]);
1092                 if (ret < 0)
1093                         exit(EXIT_FAILURE);
1094         }
1095 }
1096
1097 /**
1098  * the main function of para_audiod
1099  *
1100  * \param argc usual argument count
1101  * \param argv usual argument vector
1102  *
1103  * \return EXIT_SUCCESS or EXIT_FAILURE
1104  *
1105  * \sa para_audiod(1)
1106  * */
1107 int main(int argc, char *argv[])
1108 {
1109         int ret, i;
1110         static struct sched s;
1111         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1112         struct audiod_cmdline_parser_params params = {
1113                 .override = 0,
1114                 .initialize = 1,
1115                 .check_required = 0,
1116                 .check_ambiguity = 0,
1117                 .print_errors = 1
1118         };
1119
1120         valid_fd_012();
1121         if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1122                 exit(EXIT_FAILURE);
1123         HANDLE_VERSION_FLAG("audiod", conf);
1124         /* init receivers/filters/writers early to make help work */
1125         recv_init();
1126         filter_init();
1127         writer_init();
1128         if (conf.help_given || conf.detailed_help_given)
1129                 print_help_and_die();
1130         drop_privileges_or_die(conf.user_arg, conf.group_arg);
1131         parse_config_or_die();
1132         init_colors_or_die();
1133         daemon_set_flag(DF_LOG_TIME);
1134         daemon_set_flag(DF_LOG_HOSTNAME);
1135         daemon_set_flag(DF_LOG_LL);
1136         if (conf.logfile_given) {
1137                 daemon_set_logfile(conf.logfile_arg);
1138                 daemon_open_log_or_die();
1139         }
1140         ret = parse_stream_args();
1141         if (ret < 0) {
1142                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1143                 exit(EXIT_FAILURE);
1144         }
1145         log_welcome("para_audiod");
1146         server_uptime(UPTIME_SET);
1147         set_initial_status();
1148         FOR_EACH_SLOT(i)
1149                 clear_slot(i);
1150         init_grabbing();
1151         setup_signal_handling();
1152         signal_setup_default(sig_task);
1153
1154         init_status_task(stat_task);
1155         init_command_task(cmd_task);
1156
1157         if (conf.daemon_given)
1158                 daemonize();
1159
1160         register_task(&sig_task->task);
1161         register_task(&cmd_task->task);
1162         register_task(&stat_task->task);
1163         s.default_timeout.tv_sec = 0;
1164         s.default_timeout.tv_usec = 99 * 1000;
1165         ret = schedule(&s);
1166
1167         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1168         return EXIT_FAILURE;
1169 }