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 #include <openssl/rc4.h>
  12
  13 #include "para.h"
  14 #include "error.h"
  15 #include "crypt.h"
  16 #include "audiod.cmdline.h"
  17 #include "list.h"
  18 #include "sched.h"
  19 #include "ggo.h"
  20 #include "recv.h"
  21 #include "filter.h"
  22 #include "grab_client.h"
  23 #include "client.cmdline.h"
  24 #include "client.h"
  25 #include "audiod.h"
  26 #include "net.h"
  27 #include "daemon.h"
  28 #include "string.h"
  29 #include "fd.h"
  30 #include "write.h"
  31 #include "write_common.h"
  32 #include "signal.h"
  33
  34 /** define the array of error lists needed by para_audiod */
  35 INIT_AUDIOD_ERRLISTS;
  36 /** define the array containing all supported audio formats */
  37 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
  38
  39 /** Defines how audiod handles one supported audio format. */
  40 struct audio_format_info {
  41         /** pointer to the receiver for this audio format */
  42         struct receiver *receiver;
  43         /** the receiver configuration */
  44         void *receiver_conf;
  45         /** the number of filters that should be activated for this audio format */
  46         unsigned int num_filters;
  47         /** Array of filter numbers to be activated. */
  48         unsigned *filter_nums;
  49         /** Pointer to the array of filter configurations. */
  50         void **filter_conf;
  51         /** the number of filters that should be activated for this audio format */
  52         unsigned int num_writers;
  53         /** Array of writer numbers to be activated. */
  54         int *writer_nums;
  55         /** pointer to the array of writer configurations */
  56         void **writer_conf;
  57         /** do not start receiver/filters/writer before this time */
  58         struct timeval restart_barrier;
  59 };
  60
  61 /**
  62  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  63  * be associated with a receiver/filter/writer triple. This array holds all
  64  * information on the status of these slots.
  65  *
  66  * \sa struct slot_info
  67  * */
  68 struct slot_info slot[MAX_STREAM_SLOTS];
  69
  70 /** The vss status flags audiod is interested in. */
  71 enum vss_status_flags {
  72         /** Whether the 'N' flag is set. */
  73         VSS_STATUS_FLAG_NEXT = 1,
  74         /** The 'P' flag is set. */
  75         VSS_STATUS_FLAG_PLAYING = 2,
  76 };
  77
  78 /**
  79  * The task for obtaining para_server's status (para_client stat).
  80  *
  81  * \sa struct task, struct sched.
  82  */
  83 struct status_task {
  84         /** The associated task structure of audiod. */
  85         struct task task;
  86         /** Client data associated with the stat task. */
  87         struct client_task *ct;
  88         /** Do not restart client command until this time. */
  89         struct timeval restart_barrier;
  90         /** Last time we received status data from para_server. */
  91         struct timeval last_status_read;
  92         /** The offset value announced by para_server. */
  93         int offset_seconds;
  94         /** The length of the current audio file as announced by para_server. */
  95         int length_seconds;
  96         /** The start of the current stream from the view of para_server. */
  97         struct timeval server_stream_start;
  98         /** The average time deviation between para_server and para_audiod. */
  99         struct timeval sa_time_diff;
 100         /** Whether client time is ahead of server time. */
 101         int sa_time_diff_sign;
 102         /** The 'P' and the 'N' flags as announced by para_server. */
 103         enum vss_status_flags vss_status;
 104         /** Number of times the clock difference is to be checked. */
 105         unsigned clock_diff_count;
 106         /** When to start the next check for clock difference. */
 107         struct timeval clock_diff_barrier;
 108         /** Number of the audio format as announced by para_server. */
 109         int current_audio_format_num;
 110 };
 111
 112 /** The array of status items sent by para_server. */
 113 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
 114
 115 /**
 116  * the current mode of operation of which can be changed by the on/off/cycle
 117  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
 118  */
 119 int audiod_status = AUDIOD_ON;
 120
 121 /**
 122  * the gengetopt args_info struct that holds information on all command line
 123  * arguments
 124  */
 125 struct audiod_args_info conf;
 126
 127 static char *socket_name;
 128 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 129
 130 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
 131
 132 static struct status_task status_task_struct;
 133
 134 /**
 135  * the task that calls the status command of para_server
 136  *
 137  * \sa struct status_task
 138  */
 139 static struct status_task *stat_task = &status_task_struct;
 140 static struct timeval initial_delay_barrier;
 141
 142 /**
 143  * the task for handling audiod commands
 144  *
 145  * \sa struct task, struct sched
 146  */
 147 struct command_task {
 148         /** the local listening socket */
 149         int fd;
 150         /** the associated task structure */
 151         struct task task;
 152 };
 153
 154 /** iterate over all supported audio formats */
 155 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 156
 157 /**
 158  * get the audio format number
 159  * \param name the name of the audio format
 160  *
 161  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 162  * \a name is not a supported audio format.
 163  */
 164 int get_audio_format_num(const char *name)
 165 {
 166         int i;
 167
 168         while (para_isspace(*name))
 169                 name++;
 170         FOR_EACH_AUDIO_FORMAT(i)
 171                 if (!strcmp(name, audio_formats[i]))
 172                         return i;
 173         return -E_UNSUPPORTED_AUDIO_FORMAT;
 174 }
 175
 176 char *get_time_string(int slot_num)
 177 {
 178         int ret, seconds = 0, length;
 179         struct timeval *tmp, sum, sss, /* server stream start */
 180                 wtime, /* now - writer start */
 181                 rskip; /* receiver start - sss */
 182         struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
 183
 184         if (audiod_status == AUDIOD_OFF)
 185                 goto empty;
 186         if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
 187                 if (stat_task->length_seconds) /* paused */
 188                         return NULL;
 189                 goto empty; /* stopped */
 190         }
 191         if (audiod_status == AUDIOD_ON && !s)
 192                 goto empty;
 193         /* valid status items and playing */
 194         if (s) { /* writer active in this slot */
 195                 length = s->seconds_total;
 196                 tmp = &s->server_stream_start;
 197         } else { /* standby mode, rely on status items */
 198                 length = stat_task->length_seconds;
 199                 tmp = &stat_task->server_stream_start;
 200         }
 201         if (stat_task->sa_time_diff_sign > 0)
 202                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
 203         else
 204                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
 205         if (!s) {
 206                 struct timeval diff;
 207                 tv_diff(now, &sss, &diff);
 208                 seconds = diff.tv_sec + stat_task->offset_seconds;
 209                 goto out;
 210         }
 211         tv_diff(now, &s->wstime, &wtime);
 212         seconds = s->offset_seconds;
 213         ret = tv_diff(&s->rstime, &sss, &rskip);
 214         if (ret > 0) { /* audiod was started in the middle of the stream */
 215                 tv_add(&wtime, &rskip, &sum);
 216                 seconds += sum.tv_sec;
 217         } else
 218                 seconds += wtime.tv_sec;
 219 out:
 220         seconds = PARA_MIN(seconds, length);
 221         seconds = PARA_MAX(seconds, 0);
 222         return make_message(
 223                 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
 224                 s? "" : "~",
 225                 seconds / 60,
 226                 seconds % 60,
 227                 (length - seconds) / 60,
 228                 (length - seconds) % 60,
 229                 length? (seconds * 100 + length / 2) / length : 0,
 230                 length / 60,
 231                 length % 60
 232         );
 233 empty:
 234         return para_strdup(NULL);
 235 }
 236
 237 static int want_colors(void)
 238 {
 239         if (conf.color_arg == color_arg_no)
 240                 return 0;
 241         if (conf.color_arg == color_arg_yes)
 242                 return 1;
 243         if (conf.logfile_given)
 244                 return 0;
 245         return isatty(STDERR_FILENO);
 246 }
 247
 248 static void parse_config_or_die(void)
 249 {
 250         int ret;
 251         char *config_file;
 252         struct audiod_cmdline_parser_params params = {
 253                 .override = 0,
 254                 .initialize = 0,
 255                 .check_required = 1,
 256                 .check_ambiguity = 0,
 257                 .print_errors = 1
 258         };
 259
 260         if (conf.config_file_given)
 261                 config_file = para_strdup(conf.config_file_arg);
 262         else {
 263                 char *home = para_homedir();
 264                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 265                 free(home);
 266         }
 267         ret = file_exists(config_file);
 268         if (conf.config_file_given && !ret) {
 269                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 270                 goto err;
 271         }
 272         if (ret)
 273                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 274         free(config_file);
 275         daemon_set_loglevel(conf.loglevel_arg);
 276         return;
 277 err:
 278         free(config_file);
 279         exit(EXIT_FAILURE);
 280 }
 281
 282 static void setup_signal_handling(void)
 283 {
 284         sig_task->fd = para_signal_init();
 285         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 286         para_install_sighandler(SIGINT);
 287         para_install_sighandler(SIGTERM);
 288         para_install_sighandler(SIGHUP);
 289         para_sigaction(SIGPIPE, SIG_IGN);
 290 }
 291
 292 static void clear_slot(int slot_num)
 293 {
 294         struct slot_info *s = &slot[slot_num];
 295
 296         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 297         memset(s, 0, sizeof(struct slot_info));
 298         s->format = -1;
 299 }
 300
 301 static void close_receiver(int slot_num)
 302 {
 303         struct slot_info *s = &slot[slot_num];
 304         struct audio_format_info *a;
 305
 306         if (s->format < 0 || !s->receiver_node)
 307                 return;
 308         a = &afi[s->format];
 309         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 310                 audio_formats[s->format], slot_num);
 311         a->receiver->close(s->receiver_node);
 312         free(s->receiver_node);
 313         s->receiver_node = NULL;
 314 }
 315
 316 static void kill_all_decoders(int error)
 317 {
 318         int i;
 319
 320         FOR_EACH_SLOT(i) {
 321                 struct slot_info *s = &slot[i];
 322                 if (s->wng && s->wng->task.error >= 0) {
 323                         PARA_INFO_LOG("deactivating wng in slot %d\n",
 324                                 i);
 325                         s->wng->task.error = error;
 326                 }
 327                 if (s->fc && s->fc->task.error >= 0) {
 328                         PARA_INFO_LOG("deactivatimg filter chain in slot %d\n", i);
 329                         s->fc->task.error = error;
 330                 }
 331                 if (s->receiver_node && s->receiver_node->task.error >= 0) {
 332                         PARA_INFO_LOG("deactivating receiver_node in slot %d\n", i);
 333                         s->receiver_node->task.error = error;
 334                 }
 335         }
 336 }
 337
 338 static int get_empty_slot(void)
 339 {
 340         int i;
 341         struct slot_info *s;
 342
 343         FOR_EACH_SLOT(i) {
 344                 s = &slot[i];
 345                 if (s->format < 0) {
 346                         clear_slot(i);
 347                         return i;
 348                 }
 349                 if (s->wng || s->receiver_node || s->fc)
 350                         continue;
 351                 clear_slot(i);
 352                 return i;
 353         }
 354         return -E_NO_MORE_SLOTS;
 355 }
 356
 357 /**
 358  * get the number of filters
 359  *
 360  * \param audio_format_num the number identifying the audio format
 361  *
 362  * \return the number of filters for the given audio format
 363  *
 364  * \sa struct filter;
 365  */
 366 int num_filters(int audio_format_num)
 367 {
 368         return afi[audio_format_num].num_filters;
 369 }
 370
 371 static void open_filters(int slot_num)
 372 {
 373         struct slot_info *s = &slot[slot_num];
 374         struct audio_format_info *a = &afi[s->format];
 375         struct filter_node *fn;
 376         int nf = a->num_filters;
 377         int i;
 378
 379         s->fc = NULL;
 380         if (!nf)
 381                 return;
 382         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 383         s->fc = para_calloc(sizeof(struct filter_chain));
 384         s->fc->filter_nodes = para_malloc(nf * sizeof(struct filter_node));
 385         s->fc->inbufp = &s->receiver_node->buf;
 386         s->fc->in_loaded = &s->receiver_node->loaded;
 387         s->fc->input_error = &s->receiver_node->task.error;
 388         s->fc->task.pre_select = filter_pre_select;
 389         s->fc->task.post_select = NULL;
 390         s->fc->task.error = 0;
 391         s->fc->num_filters = nf;
 392
 393         s->receiver_node->output_error = &s->fc->task.error;
 394         sprintf(s->fc->task.status, "filter chain");
 395         FOR_EACH_FILTER_NODE(fn, s->fc, i) {
 396                 struct filter *f = filters + a->filter_nums[i];
 397                 fn->filter_num = a->filter_nums[i];
 398                 fn->conf = a->filter_conf[i];
 399                 fn->fc = s->fc;
 400                 fn->loaded = 0;
 401                 INIT_LIST_HEAD(&fn->callbacks);
 402                 f->open(fn);
 403                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 404                         audio_formats[s->format], i,  nf, f->name, slot_num);
 405                 s->fc->outbufp = &fn->buf;
 406                 s->fc->out_loaded = &fn->loaded;
 407         }
 408         register_task(&s->fc->task);
 409 }
 410
 411 static void open_writers(int slot_num)
 412 {
 413         int ret, i;
 414         struct slot_info *s = &slot[slot_num];
 415         struct audio_format_info *a = &afi[s->format];
 416
 417         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 418         if (!a->num_writers)
 419                 s->wng = setup_default_wng();
 420         else
 421                 s->wng = wng_new(a->num_writers);
 422         if (s->fc) {
 423                 s->wng->bufp = s->fc->outbufp;
 424                 s->wng->loaded = s->fc->out_loaded;
 425                 s->wng->input_error = &s->fc->task.error;
 426                 s->wng->channels = &s->fc->channels;
 427                 s->wng->samplerate = &s->fc->samplerate;
 428                 s->fc->output_error = &s->wng->task.error;
 429                 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
 430         } else {
 431                 s->wng->bufp = &s->receiver_node->buf;
 432                 s->wng->loaded = &s->receiver_node->loaded;
 433                 s->wng->input_error = &s->receiver_node->task.error;
 434         }
 435         for (i = 0; i < a->num_writers; i++) {
 436                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 437                 s->wng->writer_nodes[i].writer_num = a->writer_nums[i];
 438         }
 439         ret = wng_open(s->wng);
 440         if (ret < 0)
 441                 return;
 442         s->wstime = *now;
 443         s->server_stream_start = stat_task->server_stream_start.tv_sec?
 444                 stat_task->server_stream_start : *now;
 445         s->offset_seconds = stat_task->offset_seconds;
 446         s->seconds_total = stat_task->length_seconds;
 447         activate_inactive_grab_clients(s->format, s->fc);
 448 }
 449
 450 static int open_receiver(int format)
 451 {
 452         struct audio_format_info *a = &afi[format];
 453         struct slot_info *s;
 454         int ret, slot_num;
 455         struct receiver_node *rn;
 456         const struct timeval restart_delay = {2, 0};
 457
 458         ret = get_empty_slot();
 459         if (ret < 0)
 460                 goto err;
 461         slot_num = ret;
 462         s = &slot[slot_num];
 463         s->format = format;
 464         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 465         rn = s->receiver_node;
 466         rn->receiver = a->receiver;
 467         rn->conf = a->receiver_conf;
 468         ret = a->receiver->open(s->receiver_node);
 469         if (ret < 0) {
 470                 free(s->receiver_node);
 471                 s->receiver_node = NULL;
 472                 goto err;
 473         }
 474         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 475                 audio_formats[s->format], a->receiver->name, slot_num);
 476         rn->task.pre_select = a->receiver->pre_select;
 477         rn->task.post_select = a->receiver->post_select;
 478         s->rstime = *now;
 479         sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
 480         register_task(&rn->task);
 481         ret = 1;
 482 err:
 483         if (ret < 0)
 484                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 485         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 486         return ret;
 487 }
 488
 489 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
 490 static int receiver_running(int format)
 491 {
 492         int i, ret = 0;
 493
 494         FOR_EACH_SLOT(i) {
 495                 struct slot_info *s = &slot[i];
 496                 if (s->format != format)
 497                         continue;
 498                 if (!s->receiver_node)
 499                         continue;
 500                 if (s->receiver_node->task.error >= 0)
 501                         return 1;
 502                 ret = -1;
 503         }
 504         return ret;
 505 }
 506
 507 static void open_current_receiver(struct sched *s)
 508 {
 509         struct timeval diff;
 510         int ret, cafn = stat_task->current_audio_format_num;
 511
 512         if (cafn < 0 || !stat_task->ct)
 513                 return;
 514         /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
 515         if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
 516                 return;
 517         ret = receiver_running(cafn);
 518         if (ret > 0) /* already running and not eof */
 519                 return;
 520         if (ret < 0) { /* eof */
 521                 /*
 522                  * para_server uses a zero start time during the announcement
 523                  * period, i.e. before it sends the first chunk. Wait until
 524                  * this period begins to avoid restarting the receiver that
 525                  * belongs to the file just completed.
 526                  */
 527                 if (stat_task->server_stream_start.tv_sec)
 528                         return;
 529         }
 530         if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
 531                 /* avoid busy loop */
 532                 s->timeout = diff;
 533                 return;
 534         }
 535         /* start a new receiver */
 536         open_receiver(cafn);
 537 }
 538
 539 static unsigned compute_time_diff(const struct timeval *status_time)
 540 {
 541         struct timeval tmp, diff;
 542         static unsigned count;
 543         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 544         const struct timeval max_deviation = {0, 500 * 1000};
 545         const int time_smooth = 5;
 546
 547         if (!status_time)
 548                 return count;
 549         sign = tv_diff(status_time, now, &diff);
 550 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 551 //                      sign, sa_time_diff_sign);
 552         if (!count) {
 553                 sa_time_diff_sign = sign;
 554                 stat_task->sa_time_diff = diff;
 555                 count++;
 556                 goto out;
 557         }
 558         if (count > 5) {
 559                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 560                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 561                         PARA_WARNING_LOG("time diff jump: %lims\n",
 562                                 s * tv2ms(&tmp));
 563         }
 564         count++;
 565         sa_time_diff_sign = tv_convex_combination(
 566                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 567                 count > 10? sign : sign * time_smooth, &diff,
 568                 &tmp);
 569         stat_task->sa_time_diff = tmp;
 570         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 571                 sign > 0? "+" : "-",
 572                 tv2ms(&diff),
 573                 sa_time_diff_sign ? "+" : "-",
 574                 tv2ms(&stat_task->sa_time_diff)
 575         );
 576 out:
 577         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 578         return count;
 579 }
 580
 581 static int update_item(int itemnum, char *buf)
 582 {
 583         long unsigned sec, usec;
 584
 585         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 586                 return 1;
 587         free(stat_item_values[itemnum]);
 588         stat_item_values[itemnum] = para_strdup(buf);
 589         stat_client_write_item(itemnum);
 590         switch (itemnum) {
 591         case SI_STATUS_FLAGS:
 592                 stat_task->vss_status = 0;
 593                 if (strchr(buf, 'N'))
 594                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 595                 if (strchr(buf, 'P'))
 596                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 597                 break;
 598         case SI_OFFSET:
 599                 stat_task->offset_seconds = atoi(buf);
 600                 break;
 601         case SI_SECONDS_TOTAL:
 602                 stat_task->length_seconds = atoi(buf);
 603                 break;
 604         case SI_STREAM_START:
 605                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 606                         struct timeval a_start, delay;
 607                         delay.tv_sec = conf.stream_delay_arg / 1000;
 608                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 609                         stat_task->server_stream_start.tv_sec = sec;
 610                         stat_task->server_stream_start.tv_usec = usec;
 611                         if (compute_time_diff(NULL) > 2) {
 612                                 if (stat_task->sa_time_diff_sign < 0)
 613                                         tv_add(&stat_task->server_stream_start,
 614                                                 &stat_task->sa_time_diff, &a_start);
 615                                 else
 616                                         tv_diff(&stat_task->server_stream_start,
 617                                                 &stat_task->sa_time_diff, &a_start);
 618                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 619                         }
 620                 }
 621                 break;
 622         case SI_CURRENT_TIME:
 623                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 624                         struct timeval tv = {sec, usec};
 625                         compute_time_diff(&tv);
 626                 }
 627                 break;
 628         case SI_FORMAT:
 629                 stat_task->current_audio_format_num
 630                         = get_audio_format_num(buf);
 631         }
 632         return 1;
 633 }
 634
 635 static int parse_stream_command(const char *txt, char **cmd)
 636 {
 637         char *p = strchr(txt, ':');
 638         int i;
 639
 640         if (!p)
 641                 return -E_MISSING_COLON;
 642         p++;
 643         FOR_EACH_AUDIO_FORMAT(i) {
 644                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 645                         continue;
 646                 *cmd = p;
 647                 return i;
 648         }
 649         return -E_UNSUPPORTED_AUDIO_FORMAT;
 650 }
 651
 652 static int add_filter(int format, char *cmdline)
 653 {
 654         struct audio_format_info *a = &afi[format];
 655         int filter_num, nf = a->num_filters;
 656
 657         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 658         if (filter_num < 0)
 659                 return filter_num;
 660         a->filter_nums[nf] = filter_num;
 661         a->num_filters++;
 662         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 663                 filters[filter_num].name);
 664         return filter_num;
 665 }
 666
 667 static int parse_writer_args(void)
 668 {
 669         int i, ret, nw;
 670         char *cmd;
 671         struct audio_format_info *a;
 672
 673         nw = PARA_MAX(1U, conf.writer_given);
 674         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 675         FOR_EACH_AUDIO_FORMAT(i) {
 676                 a = &afi[i];
 677                 a->writer_conf = para_malloc(nw * sizeof(void *));
 678                 a->writer_nums = para_malloc(nw * sizeof(int));
 679                 a->num_writers = 0;
 680         }
 681         for (i = 0; i < conf.writer_given; i++) {
 682                 void *wconf;
 683                 int writer_num;
 684                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 685                 if (ret < 0)
 686                         goto out;
 687                 a = &afi[ret];
 688                 nw = a->num_writers;
 689                 wconf = check_writer_arg(cmd, &writer_num);
 690                 if (!wconf) {
 691                         ret = writer_num;
 692                         goto out;
 693                 }
 694                 a->writer_nums[nw] = writer_num;
 695                 a->writer_conf[nw] = wconf;
 696                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 697                         nw, writer_names[writer_num]);
 698                 a->num_writers++;
 699         }
 700         ret = 1;
 701 out:
 702         return ret;
 703 }
 704
 705 static int parse_receiver_args(void)
 706 {
 707         int i, ret, receiver_num;
 708         char *cmd = NULL;
 709         struct audio_format_info *a;
 710
 711         for (i = conf.receiver_given - 1; i >= 0; i--) {
 712                 char *arg = conf.receiver_arg[i];
 713                 char *recv_arg = strchr(arg, ':');
 714                 ret = -E_MISSING_COLON;
 715                 if (!recv_arg)
 716                         goto out;
 717                 *recv_arg = '\0';
 718                 recv_arg++;
 719                 ret = get_audio_format_num(arg);
 720                 if (ret < 0)
 721                         goto out;
 722                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 723                 if (!afi[ret].receiver_conf) {
 724                         ret = -E_RECV_SYNTAX;
 725                         goto out;
 726                 }
 727                 afi[ret].receiver = &receivers[receiver_num];
 728         }
 729         /* use the first available receiver with no arguments
 730          * for those audio formats for which no receiver
 731          * was specified
 732          */
 733         cmd = para_strdup(receivers[0].name);
 734         FOR_EACH_AUDIO_FORMAT(i) {
 735                 a = &afi[i];
 736                 if (a->receiver_conf)
 737                         continue;
 738                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 739                 if (!a->receiver_conf)
 740                         return -E_RECV_SYNTAX;
 741                 a->receiver = &receivers[receiver_num];
 742         }
 743         ret = 1;
 744 out:
 745         free(cmd);
 746         return ret;
 747 }
 748
 749 static int init_default_filters(void)
 750 {
 751         int i, ret = 1;
 752
 753         FOR_EACH_AUDIO_FORMAT(i) {
 754                 struct audio_format_info *a = &afi[i];
 755                 char *tmp;
 756                 int j;
 757
 758                 if (a->num_filters)
 759                         continue; /* no default -- nothing to to */
 760                 /* add "dec" to audio format name */
 761                 tmp = make_message("%sdec", audio_formats[i]);
 762                 for (j = 0; filters[j].name; j++)
 763                         if (!strcmp(tmp, filters[j].name))
 764                                 break;
 765                 free(tmp);
 766                 ret = -E_UNSUPPORTED_FILTER;
 767                 if (!filters[j].name)
 768                         goto out;
 769                 tmp = para_strdup(filters[j].name);
 770                 ret = add_filter(i, tmp);
 771                 free(tmp);
 772                 if (ret < 0)
 773                         goto out;
 774                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 775                         filters[j].name);
 776         }
 777 out:
 778         return ret;
 779 }
 780
 781 static int parse_filter_args(void)
 782 {
 783         int i, ret, nf;
 784
 785         nf = PARA_MAX(1U, conf.filter_given);
 786         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 787         FOR_EACH_AUDIO_FORMAT(i) {
 788                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 789                 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
 790         }
 791         if (!conf.no_default_filters_given)
 792                 return init_default_filters();
 793         for (i = 0; i < conf.filter_given; i++) {
 794                 char *arg = conf.filter_arg[i];
 795                 char *filter_name = strchr(arg, ':');
 796                 ret = -E_MISSING_COLON;
 797                 if (!filter_name)
 798                         goto out;
 799                 *filter_name = '\0';
 800                 filter_name++;
 801                 ret = get_audio_format_num(arg);
 802                 if (ret < 0)
 803                         goto out;
 804                 ret = add_filter(ret, filter_name);
 805                 if (ret < 0)
 806                         goto out;
 807         }
 808         ret = init_default_filters(); /* use default values for the rest */
 809 out:
 810         return ret;
 811 }
 812
 813 static int parse_stream_args(void)
 814 {
 815         int ret;
 816
 817         ret = parse_receiver_args();
 818         if (ret < 0)
 819                 return ret;
 820         ret = parse_filter_args();
 821         if (ret < 0)
 822                 return ret;
 823         ret = parse_writer_args();
 824         if (ret < 0)
 825                 return ret;
 826         return 1;
 827 }
 828
 829 /* does not unlink socket on errors */
 830 static int audiod_get_socket(void)
 831 {
 832         struct sockaddr_un unix_addr;
 833         int ret, fd;
 834
 835         if (conf.socket_given)
 836                 socket_name = para_strdup(conf.socket_arg);
 837         else {
 838                 char *hn = para_hostname();
 839                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 840                         hn);
 841                 free(hn);
 842         }
 843         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 844         if (conf.force_given)
 845                 unlink(socket_name);
 846         ret = create_local_socket(socket_name, &unix_addr,
 847                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 848         if (ret < 0)
 849                 goto err;
 850         fd = ret;
 851         if (listen(fd , 5) < 0) {
 852                 ret = -ERRNO_TO_PARA_ERROR(errno);
 853                 goto err;
 854         }
 855         ret = mark_fd_nonblocking(fd);
 856         if (ret < 0)
 857                 goto err;
 858         return fd;
 859 err:
 860         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 861         exit(EXIT_FAILURE);
 862 }
 863
 864 static void signal_pre_select(struct sched *s, struct task *t)
 865 {
 866         struct signal_task *st = container_of(t, struct signal_task, task);
 867         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 868 }
 869
 870 static void signal_post_select(struct sched *s, struct task *t)
 871 {
 872         struct signal_task *st = container_of(t, struct signal_task, task);
 873
 874         if (!FD_ISSET(st->fd, &s->rfds))
 875                 return;
 876
 877         st->signum = para_next_signal();
 878         switch (st->signum) {
 879         case SIGINT:
 880         case SIGTERM:
 881         case SIGHUP:
 882                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 883                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 884         }
 885 }
 886
 887 static void signal_setup_default(struct signal_task *st)
 888 {
 889         st->task.pre_select = signal_pre_select;
 890         st->task.post_select = signal_post_select;
 891         sprintf(st->task.status, "signal task");
 892 }
 893
 894 static void command_pre_select(struct sched *s, struct task *t)
 895 {
 896         struct command_task *ct = container_of(t, struct command_task, task);
 897         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 898 }
 899
 900 static void command_post_select(struct sched *s, struct task *t)
 901 {
 902         int ret;
 903         struct command_task *ct = container_of(t, struct command_task, task);
 904
 905         audiod_status_dump();
 906         if (!FD_ISSET(ct->fd, &s->rfds))
 907                 return;
 908         ret = handle_connect(ct->fd);
 909         if (ret < 0)
 910                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 911 }
 912
 913 static void init_command_task(struct command_task *ct)
 914 {
 915         ct->task.pre_select = command_pre_select;
 916         ct->task.post_select = command_post_select;
 917         ct->task.error = 0;
 918         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 919         sprintf(ct->task.status, "command task");
 920 }
 921
 922 static void close_stat_pipe(void)
 923 {
 924         if (!stat_task->ct)
 925                 return;
 926         client_close(stat_task->ct);
 927         stat_task->ct = NULL;
 928         clear_and_dump_items();
 929         stat_task->length_seconds = 0;
 930         stat_task->offset_seconds = 0;
 931         stat_task->vss_status = 0;
 932         audiod_status_dump();
 933 }
 934
 935 /**
 936  * close the connection to para_server and exit
 937  *
 938  * \param status the exit status which is passed to exit(3)
 939  * \param msg the log message
 940  *
 941  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
 942  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
 943  * EXIT_FAILURE.
 944  *
 945  * \sa exit(3)
 946  */
 947 void __noreturn clean_exit(int status, const char *msg)
 948 {
 949         PARA_EMERG_LOG("%s\n", msg);
 950         if (socket_name)
 951                 unlink(socket_name);
 952         close_stat_pipe();
 953         exit(status);
 954 }
 955
 956 /* avoid busy loop if server is down */
 957 static void set_stat_task_restart_barrier(unsigned seconds)
 958 {
 959         struct timeval delay = {seconds, 0};
 960         tv_add(now, &delay, &stat_task->restart_barrier);
 961 }
 962
 963 static void try_to_close_slot(int slot_num)
 964 {
 965         struct slot_info *s = &slot[slot_num];
 966
 967         if (s->format < 0)
 968                 return;
 969         if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
 970                 return;
 971         if (s->fc && s->fc->task.error != -E_TASK_UNREGISTERED)
 972                 return;
 973         if (s->wng && s->wng->task.error != -E_TASK_UNREGISTERED)
 974                 return;
 975         PARA_INFO_LOG("closing slot %d\n", slot_num);
 976         wng_close(s->wng);
 977         close_filters(s->fc);
 978         free(s->fc);
 979         close_receiver(slot_num);
 980         clear_slot(slot_num);
 981 }
 982
 983 /*
 984  * Check if any receivers/filters/writers need to be started and do so if
 985  * necessary.
 986  */
 987 static void start_stop_decoders(struct sched *s)
 988 {
 989         int i;
 990
 991         FOR_EACH_SLOT(i)
 992                 try_to_close_slot(i);
 993         if (audiod_status != AUDIOD_ON ||
 994                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
 995                 return kill_all_decoders(-E_NOT_PLAYING);
 996         open_current_receiver(s);
 997         FOR_EACH_SLOT(i) {
 998                 struct slot_info *sl = &slot[i];
 999                 struct audio_format_info *a;
1000                 struct timeval diff;
1001
1002                 if (sl->format < 0)
1003                         continue;
1004                 a = &afi[sl->format];
1005                 if (!sl->receiver_node)
1006                         continue;
1007                 if ((!a->num_filters || sl->fc) && sl->wng)
1008                         continue; /* everything already started */
1009                 if (!a->num_filters) {
1010                         if (sl->receiver_node->loaded && !sl->wng) {
1011                                 open_writers(i);
1012                         }
1013                         continue;
1014                 }
1015                 if (sl->receiver_node->loaded && !sl->fc) {
1016                         open_filters(i);
1017                         continue;
1018                 }
1019                 if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
1020                         continue;
1021                 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
1022                         open_writers(i);
1023                         continue;
1024                 }
1025                 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
1026                 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
1027                         s->timeout = diff;
1028                 }
1029         }
1030 }
1031
1032
1033 /* restart the client task if necessary */
1034 static void status_pre_select(struct sched *s, struct task *t)
1035 {
1036         struct status_task *st = container_of(t, struct status_task, task);
1037
1038         if (audiod_status == AUDIOD_OFF) {
1039                 if (!st->ct)
1040                         goto out;
1041                 if (st->ct->task.error >= 0) {
1042                         st->ct->task.error = -E_AUDIOD_OFF;
1043                         goto out;
1044                 }
1045                 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1046                         goto out;
1047                 close_stat_pipe();
1048                 st->clock_diff_count = conf.clock_diff_count_arg;
1049                 goto out;
1050         }
1051         if (st->ct) {
1052                 int ret;
1053                 if (st->ct->task.error < 0) {
1054                         if (st->ct->task.error != -E_TASK_UNREGISTERED)
1055                                 goto out;
1056                         close_stat_pipe();
1057                         goto out;
1058                 }
1059                 if (st->ct->status != CL_RECEIVING)
1060                         goto out;
1061                 ret = for_each_stat_item(st->ct->buf, st->ct->loaded,
1062                         update_item);
1063                 if (ret < 0) {
1064                         st->ct->task.error = ret;
1065                         goto out;
1066                 }
1067                 if (st->ct->loaded != ret) {
1068                         st->last_status_read = *now;
1069                         st->ct->loaded = ret;
1070                 } else {
1071                         struct timeval diff;
1072                         tv_diff(now, &st->last_status_read, &diff);
1073                         if (diff.tv_sec > 61)
1074                                 st->ct->task.error = -E_STATUS_TIMEOUT;
1075                 }
1076                 goto out;
1077         }
1078         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1079                 goto out;
1080         if (st->clock_diff_count) { /* get status only one time */
1081                 char *argv[] = {"audiod", "--", "stat", "-p", "1", NULL};
1082                 int argc = 5;
1083                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1084                 st->clock_diff_count--;
1085                 client_open(argc, argv, &st->ct, NULL);
1086                 set_stat_task_restart_barrier(2);
1087
1088         } else {
1089                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1090                 int argc = 4;
1091                 client_open(argc, argv, &st->ct, NULL);
1092                 set_stat_task_restart_barrier(5);
1093         }
1094         free(stat_item_values[SI_BASENAME]);
1095         stat_item_values[SI_BASENAME] = para_strdup(
1096                 "no connection to para_server");
1097         stat_client_write_item(SI_BASENAME);
1098         st->last_status_read = *now;
1099 out:
1100         start_stop_decoders(s);
1101 }
1102
1103 static void init_status_task(struct status_task *st)
1104 {
1105         memset(st, 0, sizeof(struct status_task));
1106         st->task.pre_select = status_pre_select;
1107         st->sa_time_diff_sign = 1;
1108         st->clock_diff_count = conf.clock_diff_count_arg;
1109         st->current_audio_format_num = -1;
1110         sprintf(st->task.status, "status task");
1111 }
1112
1113 static void set_initial_status(void)
1114 {
1115         audiod_status = AUDIOD_ON;
1116         if (!conf.mode_given)
1117                 return;
1118         if (!strcmp(conf.mode_arg, "sb")) {
1119                 audiod_status = AUDIOD_STANDBY;
1120                 return;
1121         }
1122         if (!strcmp(conf.mode_arg, "off")) {
1123                 audiod_status = AUDIOD_OFF;
1124                 return;
1125         }
1126         if (strcmp(conf.mode_arg, "on"))
1127                 PARA_WARNING_LOG("invalid mode\n");
1128 }
1129
1130 __noreturn static void print_help_and_die(void)
1131 {
1132         int d = conf.detailed_help_given;
1133         const char **p = d? audiod_args_info_detailed_help
1134                 : audiod_args_info_help;
1135
1136         printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1137                 AUDIOD_CMDLINE_PARSER_VERSION);
1138         printf_or_die("%s\n\n", audiod_args_info_usage);
1139         for (; *p; p++)
1140                 printf_or_die("%s\n", *p);
1141         print_receiver_helps(d);
1142         print_filter_helps(d);
1143         print_writer_helps(d);
1144         exit(0);
1145 }
1146
1147 static void init_colors_or_die(void)
1148 {
1149         int ret, i;
1150
1151         if (!want_colors())
1152                 return;
1153         daemon_set_default_log_colors();
1154         daemon_set_flag(DF_COLOR_LOG);
1155         for (i = 0; i < conf.log_color_given; i++) {
1156                 ret = daemon_set_log_color(conf.log_color_arg[i]);
1157                 if (ret < 0)
1158                         exit(EXIT_FAILURE);
1159         }
1160 }
1161
1162 /**
1163  * the main function of para_audiod
1164  *
1165  * \param argc usual argument count
1166  * \param argv usual argument vector
1167  *
1168  * \return EXIT_SUCCESS or EXIT_FAILURE
1169  *
1170  * \sa para_audiod(1)
1171  * */
1172 int main(int argc, char *argv[])
1173 {
1174         int ret, i;
1175         static struct sched s;
1176         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1177         struct audiod_cmdline_parser_params params = {
1178                 .override = 0,
1179                 .initialize = 1,
1180                 .check_required = 0,
1181                 .check_ambiguity = 0,
1182                 .print_errors = 1
1183         };
1184
1185         valid_fd_012();
1186         if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1187                 exit(EXIT_FAILURE);
1188         HANDLE_VERSION_FLAG("audiod", conf);
1189         /* init receivers/filters/writers early to make help work */
1190         recv_init();
1191         filter_init();
1192         writer_init();
1193         if (conf.help_given || conf.detailed_help_given)
1194                 print_help_and_die();
1195         drop_privileges_or_die(conf.user_arg, conf.group_arg);
1196         parse_config_or_die();
1197         init_colors_or_die();
1198         daemon_set_flag(DF_LOG_TIME);
1199         daemon_set_flag(DF_LOG_HOSTNAME);
1200         daemon_set_flag(DF_LOG_LL);
1201         if (conf.logfile_given) {
1202                 daemon_set_logfile(conf.logfile_arg);
1203                 daemon_open_log_or_die();
1204         }
1205         ret = parse_stream_args();
1206         if (ret < 0) {
1207                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1208                 exit(EXIT_FAILURE);
1209         }
1210         log_welcome("para_audiod");
1211         server_uptime(UPTIME_SET);
1212         set_initial_status();
1213         FOR_EACH_SLOT(i)
1214                 clear_slot(i);
1215         init_grabbing();
1216         setup_signal_handling();
1217         signal_setup_default(sig_task);
1218
1219         init_status_task(stat_task);
1220         init_command_task(cmd_task);
1221
1222         if (conf.daemon_given)
1223                 daemonize();
1224
1225         register_task(&sig_task->task);
1226         register_task(&cmd_task->task);
1227         register_task(&stat_task->task);
1228         s.default_timeout.tv_sec = 0;
1229         s.default_timeout.tv_usec = 99 * 1000;
1230         ret = schedule(&s);
1231
1232         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1233         return EXIT_FAILURE;
1234 }