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         /** Array of writer numbers to be activated. */
  53         int *writer_nums;
  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 /** The vss status flags audiod is interested in. */
  70 enum vss_status_flags {
  71         /** Whether the 'N' flag is set. */
  72         VSS_STATUS_FLAG_NEXT = 1,
  73         /** The 'P' flag is set. */
  74         VSS_STATUS_FLAG_PLAYING = 2,
  75 };
  76
  77 /**
  78  * The task for obtaining para_server's status (para_client stat).
  79  *
  80  * \sa struct task, struct sched.
  81  */
  82 struct status_task {
  83         /** The associated task structure of audiod. */
  84         struct task task;
  85         /** Client data associated with the stat task. */
  86         struct client_task *ct;
  87         /** Do not restart client command until this time. */
  88         struct timeval restart_barrier;
  89         /** Last time we received status data from para_server. */
  90         struct timeval last_status_read;
  91         /** The offset value announced by para_server. */
  92         int offset_seconds;
  93         /** The length of the current audio file as announced by para_server. */
  94         int length_seconds;
  95         /** The start of the current stream from the view of para_server. */
  96         struct timeval server_stream_start;
  97         /** The average time deviation between para_server and para_audiod. */
  98         struct timeval sa_time_diff;
  99         /** Whether client time is ahead of server time. */
 100         int sa_time_diff_sign;
 101         /** The 'P' and the 'N' flags as announced by para_server. */
 102         enum vss_status_flags vss_status;
 103         /** Number of times the clock difference is to be checked. */
 104         unsigned clock_diff_count;
 105         /** When to start the next check for clock difference. */
 106         struct timeval clock_diff_barrier;
 107         /** Number of the audio format as announced by para_server. */
 108         int current_audio_format_num;
 109 };
 110
 111 /** The array of status items sent by para_server. */
 112 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
 113
 114 /**
 115  * the current mode of operation of which can be changed by the on/off/cycle
 116  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
 117  */
 118 int audiod_status = AUDIOD_ON;
 119
 120 /**
 121  * the gengetopt args_info struct that holds information on all command line
 122  * arguments
 123  */
 124 struct audiod_args_info conf;
 125
 126 static char *socket_name;
 127 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 128
 129 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
 130
 131 static struct status_task status_task_struct;
 132
 133 /**
 134  * the task that calls the status command of para_server
 135  *
 136  * \sa struct status_task
 137  */
 138 static struct status_task *stat_task = &status_task_struct;
 139 static struct timeval initial_delay_barrier;
 140
 141 /**
 142  * the task for handling audiod commands
 143  *
 144  * \sa struct task, struct sched
 145  */
 146 struct command_task {
 147         /** the local listening socket */
 148         int fd;
 149         /** the associated task structure */
 150         struct task task;
 151 };
 152
 153 /** iterate over all supported audio formats */
 154 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 155
 156 /**
 157  * get the audio format number
 158  * \param name the name of the audio format
 159  *
 160  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 161  * \a name is not a supported audio format.
 162  */
 163 int get_audio_format_num(char *name)
 164 {
 165         int i;
 166
 167         while (para_isspace(*name))
 168                 name++;
 169         FOR_EACH_AUDIO_FORMAT(i)
 170                 if (!strcmp(name, audio_formats[i]))
 171                         return i;
 172         return -E_UNSUPPORTED_AUDIO_FORMAT;
 173 }
 174
 175 char *get_time_string(int slot_num)
 176 {
 177         int ret, seconds = 0, length;
 178         struct timeval *tmp, sum, sss, /* server stream start */
 179                 wtime, /* now - writer start */
 180                 rskip; /* receiver start - sss */
 181         struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
 182
 183         if (audiod_status == AUDIOD_OFF)
 184                 goto empty;
 185         if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
 186                 if (stat_task->length_seconds) /* paused */
 187                         return NULL;
 188                 goto empty; /* stopped */
 189         }
 190         if (audiod_status == AUDIOD_ON && !s)
 191                 goto empty;
 192         /* valid status items and playing */
 193         if (s) { /* writer active in this slot */
 194                 length = s->seconds_total;
 195                 tmp = &s->server_stream_start;
 196         } else { /* standby mode, rely on status items */
 197                 length = stat_task->length_seconds;
 198                 tmp = &stat_task->server_stream_start;
 199         }
 200         if (stat_task->sa_time_diff_sign > 0)
 201                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
 202         else
 203                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
 204         if (!s) {
 205                 struct timeval diff;
 206                 tv_diff(now, &sss, &diff);
 207                 seconds = diff.tv_sec + stat_task->offset_seconds;
 208                 goto out;
 209         }
 210         tv_diff(now, &s->wstime, &wtime);
 211         seconds = s->offset_seconds;
 212         ret = tv_diff(&s->rstime, &sss, &rskip);
 213         if (ret > 0) { /* audiod was started in the middle of the stream */
 214                 tv_add(&wtime, &rskip, &sum);
 215                 seconds += sum.tv_sec;
 216         } else
 217                 seconds += wtime.tv_sec;
 218 out:
 219         seconds = PARA_MIN(seconds, length);
 220         seconds = PARA_MAX(seconds, 0);
 221         return make_message(
 222                 "%s: %s%d:%02d [%d:%02d] (%d%%/%d:%02d)\n",
 223                 status_item_list[SI_PLAY_TIME],
 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 make_message("%s:\n", status_item_list[SI_PLAY_TIME]);
 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(slot_num, 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 check_stat_line(char *line, __a_unused void *data)
 582 {
 583         int itemnum;
 584         size_t ilen = 0;
 585         long unsigned sec, usec;
 586         char *tmp;
 587
 588         //PARA_INFO_LOG("line: %s\n", line);
 589         if (!line)
 590                 return 1;
 591         itemnum = stat_line_valid(line);
 592         if (itemnum < 0) {
 593                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 594                 return 1;
 595         }
 596         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 597                 return 1;
 598         tmp = make_message("%s\n", line);
 599         stat_client_write(tmp, itemnum);
 600         free(tmp);
 601         free(stat_item_values[itemnum]);
 602         stat_item_values[itemnum] = para_strdup(line);
 603         ilen = strlen(status_item_list[itemnum]);
 604         switch (itemnum) {
 605         case SI_STATUS_FLAGS:
 606                 stat_task->vss_status = 0;
 607                 if (strchr(line, 'N'))
 608                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 609                 if (strchr(line, 'P'))
 610                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 611                 break;
 612         case SI_OFFSET:
 613                 stat_task->offset_seconds = atoi(line + ilen + 1);
 614                 break;
 615         case SI_SECONDS_TOTAL:
 616                 stat_task->length_seconds = atoi(line + ilen + 1);
 617                 break;
 618         case SI_STREAM_START:
 619                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 620                         struct timeval a_start, delay;
 621                         delay.tv_sec = conf.stream_delay_arg / 1000;
 622                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 623                         stat_task->server_stream_start.tv_sec = sec;
 624                         stat_task->server_stream_start.tv_usec = usec;
 625                         if (compute_time_diff(NULL) > 2) {
 626                                 if (stat_task->sa_time_diff_sign < 0)
 627                                         tv_add(&stat_task->server_stream_start,
 628                                                 &stat_task->sa_time_diff, &a_start);
 629                                 else
 630                                         tv_diff(&stat_task->server_stream_start,
 631                                                 &stat_task->sa_time_diff, &a_start);
 632                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 633                         }
 634                 }
 635                 break;
 636         case SI_CURRENT_TIME:
 637                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 638                         struct timeval tv = {sec, usec};
 639                         compute_time_diff(&tv);
 640                 }
 641                 break;
 642         case SI_FORMAT:
 643                 stat_task->current_audio_format_num = get_audio_format_num(
 644                         line + ilen + 1);
 645         }
 646         return 1;
 647 }
 648
 649 static int parse_stream_command(const char *txt, char **cmd)
 650 {
 651         char *p = strchr(txt, ':');
 652         int i;
 653
 654         if (!p)
 655                 return -E_MISSING_COLON;
 656         p++;
 657         FOR_EACH_AUDIO_FORMAT(i) {
 658                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 659                         continue;
 660                 *cmd = p;
 661                 return i;
 662         }
 663         return -E_UNSUPPORTED_AUDIO_FORMAT;
 664 }
 665
 666 static int add_filter(int format, char *cmdline)
 667 {
 668         struct audio_format_info *a = &afi[format];
 669         int filter_num, nf = a->num_filters;
 670
 671         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 672         if (filter_num < 0)
 673                 return filter_num;
 674         a->filter_nums[nf] = filter_num;
 675         a->num_filters++;
 676         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 677                 filters[filter_num].name);
 678         return filter_num;
 679 }
 680
 681 static int parse_writer_args(void)
 682 {
 683         int i, ret, nw;
 684         char *cmd;
 685         struct audio_format_info *a;
 686
 687         nw = PARA_MAX(1U, conf.writer_given);
 688         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 689         FOR_EACH_AUDIO_FORMAT(i) {
 690                 a = &afi[i];
 691                 a->writer_conf = para_malloc(nw * sizeof(void *));
 692                 a->writer_nums = para_malloc(nw * sizeof(int));
 693                 a->num_writers = 0;
 694         }
 695         for (i = 0; i < conf.writer_given; i++) {
 696                 void *wconf;
 697                 int writer_num;
 698                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 699                 if (ret < 0)
 700                         goto out;
 701                 a = &afi[ret];
 702                 nw = a->num_writers;
 703                 wconf = check_writer_arg(cmd, &writer_num);
 704                 if (!wconf) {
 705                         ret = writer_num;
 706                         goto out;
 707                 }
 708                 a->writer_nums[nw] = writer_num;
 709                 a->writer_conf[nw] = wconf;
 710                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 711                         nw, writer_names[writer_num]);
 712                 a->num_writers++;
 713         }
 714         ret = 1;
 715 out:
 716         return ret;
 717 }
 718
 719 static int parse_receiver_args(void)
 720 {
 721         int i, ret, receiver_num;
 722         char *cmd = NULL;
 723         struct audio_format_info *a;
 724
 725         for (i = conf.receiver_given - 1; i >= 0; i--) {
 726                 char *arg = conf.receiver_arg[i];
 727                 char *recv_arg = strchr(arg, ':');
 728                 ret = -E_MISSING_COLON;
 729                 if (!recv_arg)
 730                         goto out;
 731                 *recv_arg = '\0';
 732                 recv_arg++;
 733                 ret = get_audio_format_num(arg);
 734                 if (ret < 0)
 735                         goto out;
 736                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 737                 if (!afi[ret].receiver_conf) {
 738                         ret = -E_RECV_SYNTAX;
 739                         goto out;
 740                 }
 741                 afi[ret].receiver = &receivers[receiver_num];
 742         }
 743         /* use the first available receiver with no arguments
 744          * for those audio formats for which no receiver
 745          * was specified
 746          */
 747         cmd = para_strdup(receivers[0].name);
 748         FOR_EACH_AUDIO_FORMAT(i) {
 749                 a = &afi[i];
 750                 if (a->receiver_conf)
 751                         continue;
 752                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 753                 if (!a->receiver_conf)
 754                         return -E_RECV_SYNTAX;
 755                 a->receiver = &receivers[receiver_num];
 756         }
 757         ret = 1;
 758 out:
 759         free(cmd);
 760         return ret;
 761 }
 762
 763 static int init_default_filters(void)
 764 {
 765         int i, ret = 1;
 766
 767         FOR_EACH_AUDIO_FORMAT(i) {
 768                 struct audio_format_info *a = &afi[i];
 769                 char *tmp;
 770                 int j;
 771
 772                 if (a->num_filters)
 773                         continue; /* no default -- nothing to to */
 774                 /* add "dec" to audio format name */
 775                 tmp = make_message("%sdec", audio_formats[i]);
 776                 for (j = 0; filters[j].name; j++)
 777                         if (!strcmp(tmp, filters[j].name))
 778                                 break;
 779                 free(tmp);
 780                 ret = -E_UNSUPPORTED_FILTER;
 781                 if (!filters[j].name)
 782                         goto out;
 783                 tmp = para_strdup(filters[j].name);
 784                 ret = add_filter(i, tmp);
 785                 free(tmp);
 786                 if (ret < 0)
 787                         goto out;
 788                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 789                         filters[j].name);
 790         }
 791 out:
 792         return ret;
 793 }
 794
 795 static int parse_filter_args(void)
 796 {
 797         int i, ret, nf;
 798
 799         nf = PARA_MAX(1U, conf.filter_given);
 800         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 801         FOR_EACH_AUDIO_FORMAT(i) {
 802                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 803                 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
 804         }
 805         if (!conf.no_default_filters_given)
 806                 return init_default_filters();
 807         for (i = 0; i < conf.filter_given; i++) {
 808                 char *arg = conf.filter_arg[i];
 809                 char *filter_name = strchr(arg, ':');
 810                 ret = -E_MISSING_COLON;
 811                 if (!filter_name)
 812                         goto out;
 813                 *filter_name = '\0';
 814                 filter_name++;
 815                 ret = get_audio_format_num(arg);
 816                 if (ret < 0)
 817                         goto out;
 818                 ret = add_filter(ret, filter_name);
 819                 if (ret < 0)
 820                         goto out;
 821         }
 822         ret = init_default_filters(); /* use default values for the rest */
 823 out:
 824         return ret;
 825 }
 826
 827 static int parse_stream_args(void)
 828 {
 829         int ret;
 830
 831         ret = parse_receiver_args();
 832         if (ret < 0)
 833                 return ret;
 834         ret = parse_filter_args();
 835         if (ret < 0)
 836                 return ret;
 837         ret = parse_writer_args();
 838         if (ret < 0)
 839                 return ret;
 840         return 1;
 841 }
 842
 843 /* does not unlink socket on errors */
 844 static int audiod_get_socket(void)
 845 {
 846         struct sockaddr_un unix_addr;
 847         int ret, fd;
 848
 849         if (conf.socket_given)
 850                 socket_name = para_strdup(conf.socket_arg);
 851         else {
 852                 char *hn = para_hostname();
 853                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 854                         hn);
 855                 free(hn);
 856         }
 857         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 858         if (conf.force_given)
 859                 unlink(socket_name);
 860         ret = create_local_socket(socket_name, &unix_addr,
 861                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 862         if (ret < 0)
 863                 goto err;
 864         fd = ret;
 865         if (listen(fd , 5) < 0) {
 866                 ret = -ERRNO_TO_PARA_ERROR(errno);
 867                 goto err;
 868         }
 869         ret = mark_fd_nonblocking(fd);
 870         if (ret < 0)
 871                 goto err;
 872         return fd;
 873 err:
 874         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 875         exit(EXIT_FAILURE);
 876 }
 877
 878 static void signal_pre_select(struct sched *s, struct task *t)
 879 {
 880         struct signal_task *st = container_of(t, struct signal_task, task);
 881         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 882 }
 883
 884 static void signal_post_select(struct sched *s, struct task *t)
 885 {
 886         struct signal_task *st = container_of(t, struct signal_task, task);
 887
 888         if (!FD_ISSET(st->fd, &s->rfds))
 889                 return;
 890
 891         st->signum = para_next_signal();
 892         switch (st->signum) {
 893         case SIGINT:
 894         case SIGTERM:
 895         case SIGHUP:
 896                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 897                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 898         }
 899 }
 900
 901 static void signal_setup_default(struct signal_task *st)
 902 {
 903         st->task.pre_select = signal_pre_select;
 904         st->task.post_select = signal_post_select;
 905         sprintf(st->task.status, "signal task");
 906 }
 907
 908 static void command_pre_select(struct sched *s, struct task *t)
 909 {
 910         struct command_task *ct = container_of(t, struct command_task, task);
 911         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 912 }
 913
 914 static void command_post_select(struct sched *s, struct task *t)
 915 {
 916         int ret;
 917         struct command_task *ct = container_of(t, struct command_task, task);
 918
 919         audiod_status_dump();
 920         if (!FD_ISSET(ct->fd, &s->rfds))
 921                 return;
 922         ret = handle_connect(ct->fd);
 923         if (ret < 0)
 924                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 925 }
 926
 927 static void init_command_task(struct command_task *ct)
 928 {
 929         ct->task.pre_select = command_pre_select;
 930         ct->task.post_select = command_post_select;
 931         ct->task.error = 0;
 932         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 933         sprintf(ct->task.status, "command task");
 934 }
 935
 936 static void close_stat_pipe(void)
 937 {
 938         int i;
 939
 940         if (!stat_task->ct)
 941                 return;
 942         client_close(stat_task->ct);
 943         stat_task->ct = NULL;
 944         FOR_EACH_STATUS_ITEM(i) {
 945                 free(stat_item_values[i]);
 946                 stat_item_values[i] = NULL;
 947         }
 948         dump_empty_status();
 949         stat_task->length_seconds = 0;
 950         stat_task->offset_seconds = 0;
 951         stat_task->vss_status = 0;
 952         audiod_status_dump();
 953 }
 954
 955 /**
 956  * close the connection to para_server and exit
 957  *
 958  * \param status the exit status which is passed to exit(3)
 959  * \param msg the log message
 960  *
 961  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
 962  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
 963  * EXIT_FAILURE.
 964  *
 965  * \sa exit(3)
 966  */
 967 void __noreturn clean_exit(int status, const char *msg)
 968 {
 969         PARA_EMERG_LOG("%s\n", msg);
 970         if (socket_name)
 971                 unlink(socket_name);
 972         close_stat_pipe();
 973         exit(status);
 974 }
 975
 976 /* avoid busy loop if server is down */
 977 static void set_stat_task_restart_barrier(unsigned seconds)
 978 {
 979         struct timeval delay = {seconds, 0};
 980         tv_add(now, &delay, &stat_task->restart_barrier);
 981 }
 982
 983 static void try_to_close_slot(int slot_num)
 984 {
 985         struct slot_info *s = &slot[slot_num];
 986
 987         if (s->format < 0)
 988                 return;
 989         if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
 990                 return;
 991         if (s->fc && s->fc->task.error != -E_TASK_UNREGISTERED)
 992                 return;
 993         if (s->wng && s->wng->task.error != -E_TASK_UNREGISTERED)
 994                 return;
 995         PARA_INFO_LOG("closing slot %d\n", slot_num);
 996         wng_close(s->wng);
 997         close_filters(s->fc);
 998         free(s->fc);
 999         close_receiver(slot_num);
1000         clear_slot(slot_num);
1001 }
1002
1003 /*
1004  * Check if any receivers/filters/writers need to be started and do so if
1005  * necessary.
1006  */
1007 static void start_stop_decoders(struct sched *s)
1008 {
1009         int i;
1010
1011         FOR_EACH_SLOT(i)
1012                 try_to_close_slot(i);
1013         if (audiod_status != AUDIOD_ON ||
1014                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1015                 return kill_all_decoders(-E_NOT_PLAYING);
1016         open_current_receiver(s);
1017         FOR_EACH_SLOT(i) {
1018                 struct slot_info *sl = &slot[i];
1019                 struct audio_format_info *a;
1020                 struct timeval diff;
1021
1022                 if (sl->format < 0)
1023                         continue;
1024                 a = &afi[sl->format];
1025                 if (!sl->receiver_node)
1026                         continue;
1027                 if ((!a->num_filters || sl->fc) && sl->wng)
1028                         continue; /* everything already started */
1029                 if (!a->num_filters) {
1030                         if (sl->receiver_node->loaded && !sl->wng) {
1031                                 open_writers(i);
1032                         }
1033                         continue;
1034                 }
1035                 if (sl->receiver_node->loaded && !sl->fc) {
1036                         open_filters(i);
1037                         continue;
1038                 }
1039                 if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
1040                         continue;
1041                 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
1042                         open_writers(i);
1043                         continue;
1044                 }
1045                 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
1046                 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
1047                         s->timeout = diff;
1048                 }
1049         }
1050 }
1051
1052
1053 /* restart the client task if necessary */
1054 static void status_pre_select(struct sched *s, struct task *t)
1055 {
1056         struct status_task *st = container_of(t, struct status_task, task);
1057
1058         if (audiod_status == AUDIOD_OFF) {
1059                 if (!st->ct)
1060                         goto out;
1061                 if (st->ct->task.error >= 0) {
1062                         st->ct->task.error = -E_AUDIOD_OFF;
1063                         goto out;
1064                 }
1065                 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1066                         goto out;
1067                 close_stat_pipe();
1068                 st->clock_diff_count = conf.clock_diff_count_arg;
1069                 goto out;
1070         }
1071         if (st->ct) {
1072                 unsigned bytes_left;
1073                 if (st->ct->task.error < 0) {
1074                         if (st->ct->task.error != -E_TASK_UNREGISTERED)
1075                                 goto out;
1076                         close_stat_pipe();
1077                         goto out;
1078                 }
1079                 if (st->ct->status != CL_RECEIVING)
1080                         goto out;
1081                 bytes_left = for_each_line(st->ct->buf, st->ct->loaded,
1082                         &check_stat_line, NULL);
1083                 if (st->ct->loaded != bytes_left) {
1084                         st->last_status_read = *now;
1085                         st->ct->loaded = bytes_left;
1086                 } else {
1087                         struct timeval diff;
1088                         tv_diff(now, &st->last_status_read, &diff);
1089                         if (diff.tv_sec > 61)
1090                                 st->ct->task.error = -E_STATUS_TIMEOUT;
1091                 }
1092                 goto out;
1093         }
1094         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1095                 goto out;
1096         if (st->clock_diff_count) { /* get status only one time */
1097                 char *argv[] = {"audiod", "stat", "1", NULL};
1098                 int argc = 3;
1099                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1100                 st->clock_diff_count--;
1101                 client_open(argc, argv, &st->ct, NULL);
1102                 set_stat_task_restart_barrier(2);
1103
1104         } else {
1105                 char *argv[] = {"audiod", "stat", NULL};
1106                 int argc = 2;
1107                 client_open(argc, argv, &st->ct, NULL);
1108                 set_stat_task_restart_barrier(5);
1109         }
1110         free(stat_item_values[SI_BASENAME]);
1111         stat_item_values[SI_BASENAME] = make_message(
1112                 "%s: no connection to para_server\n",
1113                 status_item_list[SI_BASENAME]);
1114         stat_client_write(stat_item_values[SI_BASENAME],
1115                 SI_BASENAME);
1116         st->last_status_read = *now;
1117 out:
1118         start_stop_decoders(s);
1119 }
1120
1121 static void init_status_task(struct status_task *st)
1122 {
1123         memset(st, 0, sizeof(struct status_task));
1124         st->task.pre_select = status_pre_select;
1125         st->sa_time_diff_sign = 1;
1126         st->clock_diff_count = conf.clock_diff_count_arg;
1127         st->current_audio_format_num = -1;
1128         sprintf(st->task.status, "status task");
1129 }
1130
1131 static void set_initial_status(void)
1132 {
1133         audiod_status = AUDIOD_ON;
1134         if (!conf.mode_given)
1135                 return;
1136         if (!strcmp(conf.mode_arg, "sb")) {
1137                 audiod_status = AUDIOD_STANDBY;
1138                 return;
1139         }
1140         if (!strcmp(conf.mode_arg, "off")) {
1141                 audiod_status = AUDIOD_OFF;
1142                 return;
1143         }
1144         if (strcmp(conf.mode_arg, "on"))
1145                 PARA_WARNING_LOG("invalid mode\n");
1146 }
1147
1148 __noreturn static void print_help_and_die(void)
1149 {
1150         int d = conf.detailed_help_given;
1151         const char **p = d? audiod_args_info_detailed_help
1152                 : audiod_args_info_help;
1153
1154         printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1155                 AUDIOD_CMDLINE_PARSER_VERSION);
1156         printf_or_die("%s\n\n", audiod_args_info_usage);
1157         for (; *p; p++)
1158                 printf_or_die("%s\n", *p);
1159         print_receiver_helps(d);
1160         print_filter_helps(d);
1161         print_writer_helps(d);
1162         exit(0);
1163 }
1164
1165 static void init_colors_or_die(void)
1166 {
1167         int ret, i;
1168
1169         if (!want_colors())
1170                 return;
1171         daemon_set_default_log_colors();
1172         daemon_set_flag(DF_COLOR_LOG);
1173         for (i = 0; i < conf.log_color_given; i++) {
1174                 ret = daemon_set_log_color(conf.log_color_arg[i]);
1175                 if (ret < 0)
1176                         exit(EXIT_FAILURE);
1177         }
1178 }
1179
1180 /**
1181  * the main function of para_audiod
1182  *
1183  * \param argc usual argument count
1184  * \param argv usual argument vector
1185  *
1186  * \return EXIT_SUCCESS or EXIT_FAILURE
1187  *
1188  * \sa para_audiod(1)
1189  * */
1190 int main(int argc, char *argv[])
1191 {
1192         int ret, i;
1193         static struct sched s;
1194         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1195         struct audiod_cmdline_parser_params params = {
1196                 .override = 0,
1197                 .initialize = 1,
1198                 .check_required = 0,
1199                 .check_ambiguity = 0,
1200                 .print_errors = 1
1201         };
1202
1203         valid_fd_012();
1204         if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1205                 exit(EXIT_FAILURE);
1206         HANDLE_VERSION_FLAG("audiod", conf);
1207         /* init receivers/filters/writers early to make help work */
1208         recv_init();
1209         filter_init();
1210         writer_init();
1211         if (conf.help_given || conf.detailed_help_given)
1212                 print_help_and_die();
1213         drop_privileges_or_die(conf.user_arg, conf.group_arg);
1214         parse_config_or_die();
1215         init_colors_or_die();
1216         daemon_set_flag(DF_LOG_TIME);
1217         daemon_set_flag(DF_LOG_HOSTNAME);
1218         daemon_set_flag(DF_LOG_LL);
1219         if (conf.logfile_given) {
1220                 daemon_set_logfile(conf.logfile_arg);
1221                 daemon_open_log_or_die();
1222         }
1223         ret = parse_stream_args();
1224         if (ret < 0) {
1225                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1226                 exit(EXIT_FAILURE);
1227         }
1228         log_welcome("para_audiod");
1229         server_uptime(UPTIME_SET);
1230         set_initial_status();
1231         FOR_EACH_SLOT(i)
1232                 clear_slot(i);
1233         init_grabbing();
1234         setup_signal_handling();
1235         signal_setup_default(sig_task);
1236
1237         init_status_task(stat_task);
1238         init_command_task(cmd_task);
1239
1240         if (conf.daemon_given)
1241                 daemonize();
1242
1243         register_task(&sig_task->task);
1244         register_task(&cmd_task->task);
1245         register_task(&stat_task->task);
1246         s.default_timeout.tv_sec = 0;
1247         s.default_timeout.tv_usec = 99 * 1000;
1248         ret = schedule(&s);
1249
1250         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1251         return EXIT_FAILURE;
1252 }