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 <regex.h>
   9 #include <sys/types.h>
  10 #include <dirent.h>
  11 #include <signal.h>
  12 #include <openssl/rc4.h>
  13 #include <stdbool.h>
  14
  15 #include "para.h"
  16 #include "error.h"
  17 #include "crypt.h"
  18 #include "audiod.cmdline.h"
  19 #include "list.h"
  20 #include "sched.h"
  21 #include "ggo.h"
  22 #include "recv.h"
  23 #include "buffer_tree.h"
  24 #include "filter.h"
  25 #include "grab_client.h"
  26 #include "client.cmdline.h"
  27 #include "client.h"
  28 #include "audiod.h"
  29 #include "net.h"
  30 #include "daemon.h"
  31 #include "string.h"
  32 #include "fd.h"
  33 #include "write.h"
  34 #include "write_common.h"
  35 #include "signal.h"
  36
  37 /** define the array of error lists needed by para_audiod */
  38 INIT_AUDIOD_ERRLISTS;
  39 /** define the array containing all supported audio formats */
  40 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
  41
  42 /** Defines how audiod handles one supported audio format. */
  43 struct audio_format_info {
  44         /** pointer to the receiver for this audio format */
  45         struct receiver *receiver;
  46         /** the receiver configuration */
  47         void *receiver_conf;
  48         /** the number of filters that should be activated for this audio format */
  49         unsigned int num_filters;
  50         /** Array of filter numbers to be activated. */
  51         unsigned *filter_nums;
  52         /** Pointer to the array of filter configurations. */
  53         void **filter_conf;
  54         /** the number of filters that should be activated for this audio format */
  55         unsigned int num_writers;
  56         /** Array of writer numbers to be activated. */
  57         int *writer_nums;
  58         /** pointer to the array of writer configurations */
  59         void **writer_conf;
  60         /** do not start receiver/filters/writer before this time */
  61         struct timeval restart_barrier;
  62 };
  63
  64 /**
  65  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  66  * be associated with a receiver/filter/writer triple. This array holds all
  67  * information on the status of these slots.
  68  *
  69  * \sa struct slot_info
  70  * */
  71 struct slot_info slot[MAX_STREAM_SLOTS];
  72
  73 /** The vss status flags audiod is interested in. */
  74 enum vss_status_flags {
  75         /** Whether the 'N' flag is set. */
  76         VSS_STATUS_FLAG_NEXT = 1,
  77         /** The 'P' flag is set. */
  78         VSS_STATUS_FLAG_PLAYING = 2,
  79 };
  80
  81 /**
  82  * The task for obtaining para_server's status (para_client stat).
  83  *
  84  * \sa struct task, struct sched.
  85  */
  86 struct status_task {
  87         /** The associated task structure of audiod. */
  88         struct task task;
  89         /** Client data associated with the stat task. */
  90         struct client_task *ct;
  91         /** Do not restart client command until this time. */
  92         struct timeval restart_barrier;
  93         /** Last time we received status data from para_server. */
  94         struct timeval last_status_read;
  95         /** The offset value announced by para_server. */
  96         int offset_seconds;
  97         /** The length of the current audio file as announced by para_server. */
  98         int length_seconds;
  99         /** The start of the current stream from the view of para_server. */
 100         struct timeval server_stream_start;
 101         /** The average time deviation between para_server and para_audiod. */
 102         struct timeval sa_time_diff;
 103         /** Whether client time is ahead of server time. */
 104         int sa_time_diff_sign;
 105         /** The 'P' and the 'N' flags as announced by para_server. */
 106         enum vss_status_flags vss_status;
 107         /** Number of times the clock difference is to be checked. */
 108         unsigned clock_diff_count;
 109         /** When to start the next check for clock difference. */
 110         struct timeval clock_diff_barrier;
 111         /** Number of the audio format as announced by para_server. */
 112         int current_audio_format_num;
 113 };
 114
 115 /** The array of status items sent by para_server. */
 116 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
 117
 118 /**
 119  * the current mode of operation of which can be changed by the on/off/cycle
 120  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
 121  */
 122 int audiod_status = AUDIOD_ON;
 123
 124 /**
 125  * the gengetopt args_info struct that holds information on all command line
 126  * arguments
 127  */
 128 struct audiod_args_info conf;
 129
 130 static char *socket_name;
 131 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 132
 133 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
 134
 135 static struct status_task status_task_struct;
 136
 137 /**
 138  * the task that calls the status command of para_server
 139  *
 140  * \sa struct status_task
 141  */
 142 static struct status_task *stat_task = &status_task_struct;
 143 static struct timeval initial_delay_barrier;
 144
 145 /**
 146  * the task for handling audiod commands
 147  *
 148  * \sa struct task, struct sched
 149  */
 150 struct command_task {
 151         /** the local listening socket */
 152         int fd;
 153         /** the associated task structure */
 154         struct task task;
 155 };
 156
 157 /** iterate over all supported audio formats */
 158 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 159
 160 /**
 161  * get the audio format number
 162  * \param name the name of the audio format
 163  *
 164  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 165  * \a name is not a supported audio format.
 166  */
 167 int get_audio_format_num(const char *name)
 168 {
 169         int i;
 170
 171         while (para_isspace(*name))
 172                 name++;
 173         FOR_EACH_AUDIO_FORMAT(i)
 174                 if (!strcmp(name, audio_formats[i]))
 175                         return i;
 176         return -E_UNSUPPORTED_AUDIO_FORMAT;
 177 }
 178
 179 char *get_time_string(int slot_num)
 180 {
 181         int ret, seconds = 0, length;
 182         struct timeval *tmp, sum, sss, /* server stream start */
 183                 rstime, /* receiver start time */
 184                 wstime, /* writer start time */
 185                 wtime, /* now - writer start */
 186                 rskip; /* receiver start - sss */
 187         struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
 188         char *msg;
 189
 190         if (audiod_status == AUDIOD_OFF)
 191                 goto empty;
 192         if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
 193                 if (stat_task->length_seconds) /* paused */
 194                         return NULL;
 195                 goto empty; /* stopped */
 196         }
 197         if (audiod_status == AUDIOD_ON && !s)
 198                 goto empty;
 199         /* valid status items and playing */
 200         if (s && s->wns) { /* writer active in this slot */
 201                 length = s->seconds_total;
 202                 tmp = &s->server_stream_start;
 203         } else { /* standby mode, rely on status items */
 204                 length = stat_task->length_seconds;
 205                 tmp = &stat_task->server_stream_start;
 206         }
 207         if (stat_task->sa_time_diff_sign > 0)
 208                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
 209         else
 210                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
 211         if (!s || !s->wns) {
 212                 struct timeval diff;
 213                 tv_diff(now, &sss, &diff);
 214                 seconds = diff.tv_sec + stat_task->offset_seconds;
 215                 goto out;
 216         }
 217         btr_get_node_start(s->wns[0].btrn, &wstime);
 218         tv_diff(now, &wstime, &wtime);
 219         //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
 220         seconds = s->offset_seconds;
 221         btr_get_node_start(s->receiver_node->btrn, &rstime);
 222         ret = tv_diff(&rstime, &sss, &rskip);
 223         if (ret > 0) { /* audiod was started in the middle of the stream */
 224                 tv_add(&wtime, &rskip, &sum);
 225                 seconds += sum.tv_sec;
 226         } else
 227                 seconds += wtime.tv_sec;
 228 out:
 229         seconds = PARA_MIN(seconds, length);
 230         seconds = PARA_MAX(seconds, 0);
 231         msg = make_message(
 232                 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
 233                 s? "" : "~",
 234                 seconds / 60,
 235                 seconds % 60,
 236                 (length - seconds) / 60,
 237                 (length - seconds) % 60,
 238                 length? (seconds * 100 + length / 2) / length : 0,
 239                 length / 60,
 240                 length % 60
 241         );
 242         PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
 243         return msg;
 244 empty:
 245         return para_strdup(NULL);
 246 }
 247
 248 static int want_colors(void)
 249 {
 250         if (conf.color_arg == color_arg_no)
 251                 return 0;
 252         if (conf.color_arg == color_arg_yes)
 253                 return 1;
 254         if (conf.logfile_given)
 255                 return 0;
 256         return isatty(STDERR_FILENO);
 257 }
 258
 259 static void parse_config_or_die(void)
 260 {
 261         int ret;
 262         char *config_file;
 263         struct audiod_cmdline_parser_params params = {
 264                 .override = 0,
 265                 .initialize = 0,
 266                 .check_required = 1,
 267                 .check_ambiguity = 0,
 268                 .print_errors = 1
 269         };
 270
 271         if (conf.config_file_given)
 272                 config_file = para_strdup(conf.config_file_arg);
 273         else {
 274                 char *home = para_homedir();
 275                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 276                 free(home);
 277         }
 278         ret = file_exists(config_file);
 279         if (conf.config_file_given && !ret) {
 280                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 281                 goto err;
 282         }
 283         if (ret)
 284                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 285         free(config_file);
 286         daemon_set_loglevel(conf.loglevel_arg);
 287         return;
 288 err:
 289         free(config_file);
 290         exit(EXIT_FAILURE);
 291 }
 292
 293 static void setup_signal_handling(void)
 294 {
 295         sig_task->fd = para_signal_init();
 296         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 297         para_install_sighandler(SIGINT);
 298         para_install_sighandler(SIGTERM);
 299         para_install_sighandler(SIGHUP);
 300         para_sigaction(SIGPIPE, SIG_IGN);
 301 }
 302
 303 static void clear_slot(int slot_num)
 304 {
 305         struct slot_info *s = &slot[slot_num];
 306
 307         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 308         memset(s, 0, sizeof(struct slot_info));
 309         s->format = -1;
 310 }
 311
 312 static void close_receiver(int slot_num)
 313 {
 314         struct slot_info *s = &slot[slot_num];
 315         struct audio_format_info *a;
 316
 317         if (s->format < 0 || !s->receiver_node)
 318                 return;
 319         a = &afi[s->format];
 320         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 321                 audio_formats[s->format], slot_num);
 322         a->receiver->close(s->receiver_node);
 323         btr_free_node(s->receiver_node->btrn);
 324         free(s->receiver_node);
 325         s->receiver_node = NULL;
 326         stat_task->current_audio_format_num = -1;
 327 }
 328
 329 static void writer_cleanup(struct writer_node *wn)
 330 {
 331         struct writer *w = writers + wn->writer_num;
 332
 333         w->close(wn);
 334         btr_free_node(wn->btrn);
 335 }
 336
 337 static void close_writers(struct slot_info *s)
 338 {
 339         struct audio_format_info *a;
 340         int i;
 341
 342         if (s->format < 0)
 343                 return;
 344         a = afi + s->format;
 345         if (a->num_writers == 0)
 346                 writer_cleanup(s->wns);
 347         else {
 348                 for (i = 0; i < a->num_writers; i++)
 349                         writer_cleanup(s->wns + i);
 350         }
 351         free(s->wns);
 352         s->wns = NULL;
 353 }
 354
 355 static void _close_filters(struct slot_info *s)
 356 {
 357         int i;
 358         struct audio_format_info *a = afi + s->format;
 359         if (a->num_filters == 0)
 360                 return;
 361         for (i = 0; i < a->num_filters; i++) {
 362                 struct filter_node *fn = s->fns + i;
 363                 struct filter *f = filters + fn->filter_num;
 364
 365                 f->close(fn);
 366                 btr_free_node(fn->btrn);
 367         }
 368         free(s->fns);
 369         s->fns = NULL;
 370 }
 371
 372 static void kill_all_decoders(int error)
 373 {
 374         int i, j;
 375
 376         FOR_EACH_SLOT(i) {
 377                 struct slot_info *s = &slot[i];
 378                 struct audio_format_info *a;
 379                 if (s->format < 0)
 380                         continue;
 381                 a = afi + s->format;
 382                 if (s->wns)
 383                         for (j = 0; j < a->num_writers; j++)
 384                                 s->wns[j].task.error = error;
 385                 if (s->fns)
 386                         for (j = 0; j < a->num_writers; j++)
 387                                 s->fns[j].task.error = error;
 388                 if (s->receiver_node)
 389                         s->receiver_node->task.error = error;
 390         }
 391 }
 392
 393 static int get_empty_slot(void)
 394 {
 395         int i;
 396         struct slot_info *s;
 397
 398         FOR_EACH_SLOT(i) {
 399                 s = &slot[i];
 400                 if (s->format < 0) {
 401                         clear_slot(i);
 402                         return i;
 403                 }
 404                 if (s->wns || s->receiver_node || s->fns)
 405                         continue;
 406                 clear_slot(i);
 407                 return i;
 408         }
 409         return -E_NO_MORE_SLOTS;
 410 }
 411
 412 /**
 413  * get the number of filters
 414  *
 415  * \param audio_format_num the number identifying the audio format
 416  *
 417  * \return the number of filters for the given audio format
 418  *
 419  * \sa struct filter;
 420  */
 421 int num_filters(int audio_format_num)
 422 {
 423         return afi[audio_format_num].num_filters;
 424 }
 425
 426 static void open_filters(struct slot_info *s)
 427 {
 428         struct audio_format_info *a = afi + s->format;
 429         struct filter_node *fn;
 430         int nf = a->num_filters;
 431         struct btr_node *parent;
 432         int i;
 433
 434         if (nf == 0)
 435                 return;
 436         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 437         assert(s->fns == NULL);
 438         s->fns = para_calloc(nf * sizeof(struct filter_node));
 439         parent = s->receiver_node->btrn;
 440         for (i = 0; i < nf; i++) {
 441                 struct filter *f = filters + a->filter_nums[i];
 442                 fn = s->fns + i;
 443                 fn->filter_num = a->filter_nums[i];
 444                 fn->conf = a->filter_conf[i];
 445                 fn->task.pre_select = f->pre_select;
 446                 fn->task.post_select = f->post_select;
 447                 fn->btrn = btr_new_node(f->name, parent, f->execute, fn);
 448                 f->open(fn);
 449                 register_task(&fn->task);
 450                 parent = fn->btrn;
 451                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 452                         audio_formats[s->format], i,  nf, f->name, s - slot);
 453                 sprintf(fn->task.status, "%s (slot %d)", f->name, s - slot);
 454         }
 455 }
 456
 457 static void open_writers(struct slot_info *s)
 458 {
 459         int i;
 460         struct audio_format_info *a = afi + s->format;
 461         struct writer_node *wn;
 462         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 463
 464         assert(s->wns == NULL);
 465         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 466                 * sizeof(struct writer_node));
 467         if (a->num_writers == 0)
 468                 setup_writer_node(NULL, parent, s->wns);
 469         else {
 470                 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 471                 for (i = 0; i < a->num_writers; i++) {
 472                         wn = s->wns + i;
 473                         wn->conf = a->writer_conf[i];
 474                         wn->writer_num = a->writer_nums[i];
 475                         register_writer_node(wn, parent);
 476                 }
 477         }
 478         s->server_stream_start = stat_task->server_stream_start.tv_sec?
 479                 stat_task->server_stream_start : *now;
 480         s->offset_seconds = stat_task->offset_seconds;
 481         s->seconds_total = stat_task->length_seconds;
 482 }
 483
 484 /* returns slot num on success */
 485 static int open_receiver(int format)
 486 {
 487         struct audio_format_info *a = &afi[format];
 488         struct slot_info *s;
 489         int ret, slot_num;
 490         struct receiver *r = a->receiver;
 491         struct receiver_node *rn;
 492         const struct timeval restart_delay = {2, 0};
 493
 494         ret = get_empty_slot();
 495         if (ret < 0)
 496                 goto err;
 497         slot_num = ret;
 498         s = &slot[slot_num];
 499         s->format = format;
 500         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 501         rn = s->receiver_node;
 502         rn->receiver = r;
 503         rn->conf = a->receiver_conf;
 504         rn->btrn = btr_new_node(r->name, NULL, NULL, rn);
 505         ret = r->open(rn);
 506         if (ret < 0) {
 507                 btr_free_node(rn->btrn);
 508                 free(rn);
 509                 s->receiver_node = NULL;
 510                 goto err;
 511         }
 512         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 513                 audio_formats[s->format], r->name, slot_num);
 514         rn->task.pre_select = r->pre_select;
 515         rn->task.post_select = r->post_select;
 516         sprintf(rn->task.status, "%s receiver node", r->name);
 517         register_task(&rn->task);
 518         ret = slot_num;
 519 err:
 520         if (ret < 0)
 521                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 522         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 523         return ret;
 524 }
 525
 526 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
 527 static int receiver_running(int format)
 528 {
 529         int i, ret = 0;
 530
 531         FOR_EACH_SLOT(i) {
 532                 struct slot_info *s = &slot[i];
 533                 if (s->format != format)
 534                         continue;
 535                 if (!s->receiver_node)
 536                         continue;
 537                 if (s->receiver_node->task.error >= 0)
 538                         return 1;
 539                 ret = -1;
 540         }
 541         return ret;
 542 }
 543
 544 struct btr_node *audiod_get_btr_root(void)
 545 {
 546         int i, newest_slot = -1;
 547         struct timeval newest_rstime = {0, 0};
 548
 549         FOR_EACH_SLOT(i) {
 550                 struct slot_info *s = &slot[i];
 551                 struct timeval rstime;
 552                 if (!s->receiver_node)
 553                         continue;
 554                 if (s->receiver_node->task.error < 0)
 555                         continue;
 556                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 557                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 558                         continue;
 559                 newest_rstime = rstime;
 560                 newest_slot = i;
 561         }
 562         if (newest_slot == -1)
 563                 return NULL;
 564         return slot[newest_slot].receiver_node->btrn;
 565 }
 566
 567 /* returns slot num on success. */
 568 static int open_current_receiver(struct sched *s)
 569 {
 570         struct timeval diff;
 571         int ret, cafn = stat_task->current_audio_format_num;
 572
 573         if (cafn < 0 || !stat_task->ct)
 574                 return -1;
 575         /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
 576         if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
 577                 return -1;
 578         ret = receiver_running(cafn);
 579         if (ret > 0) /* already running and not eof */
 580                 return -1;
 581         if (ret < 0) { /* eof */
 582                 /*
 583                  * para_server uses a zero start time during the announcement
 584                  * period, i.e. before it sends the first chunk. Wait until
 585                  * this period begins to avoid restarting the receiver that
 586                  * belongs to the file just completed.
 587                  */
 588                 if (stat_task->server_stream_start.tv_sec != 0)
 589                         return -1;
 590         }
 591         if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
 592                 /* avoid busy loop */
 593                 s->timeout = diff;
 594                 return -1;
 595         }
 596         /* start a new receiver */
 597         return open_receiver(cafn);
 598 }
 599
 600 static unsigned compute_time_diff(const struct timeval *status_time)
 601 {
 602         struct timeval tmp, diff;
 603         static unsigned count;
 604         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 605         const struct timeval max_deviation = {0, 500 * 1000};
 606         const int time_smooth = 5;
 607
 608         if (!status_time)
 609                 return count;
 610         sign = tv_diff(status_time, now, &diff);
 611 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 612 //                      sign, sa_time_diff_sign);
 613         if (!count) {
 614                 sa_time_diff_sign = sign;
 615                 stat_task->sa_time_diff = diff;
 616                 count++;
 617                 goto out;
 618         }
 619         if (count > 5) {
 620                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 621                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 622                         PARA_WARNING_LOG("time diff jump: %lims\n",
 623                                 s * tv2ms(&tmp));
 624         }
 625         count++;
 626         sa_time_diff_sign = tv_convex_combination(
 627                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 628                 count > 10? sign : sign * time_smooth, &diff,
 629                 &tmp);
 630         stat_task->sa_time_diff = tmp;
 631         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 632                 sign > 0? "+" : "-",
 633                 tv2ms(&diff),
 634                 sa_time_diff_sign ? "+" : "-",
 635                 tv2ms(&stat_task->sa_time_diff)
 636         );
 637 out:
 638         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 639         return count;
 640 }
 641
 642 static int update_item(int itemnum, char *buf)
 643 {
 644         long unsigned sec, usec;
 645
 646         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 647                 return 1;
 648         free(stat_item_values[itemnum]);
 649         stat_item_values[itemnum] = para_strdup(buf);
 650         stat_client_write_item(itemnum);
 651         switch (itemnum) {
 652         case SI_STATUS_FLAGS:
 653                 stat_task->vss_status = 0;
 654                 if (strchr(buf, 'N'))
 655                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 656                 if (strchr(buf, 'P'))
 657                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 658                 break;
 659         case SI_OFFSET:
 660                 stat_task->offset_seconds = atoi(buf);
 661                 break;
 662         case SI_SECONDS_TOTAL:
 663                 stat_task->length_seconds = atoi(buf);
 664                 break;
 665         case SI_STREAM_START:
 666                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 667                         struct timeval a_start, delay;
 668                         delay.tv_sec = conf.stream_delay_arg / 1000;
 669                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 670                         stat_task->server_stream_start.tv_sec = sec;
 671                         stat_task->server_stream_start.tv_usec = usec;
 672                         if (compute_time_diff(NULL) > 2) {
 673                                 if (stat_task->sa_time_diff_sign < 0)
 674                                         tv_add(&stat_task->server_stream_start,
 675                                                 &stat_task->sa_time_diff, &a_start);
 676                                 else
 677                                         tv_diff(&stat_task->server_stream_start,
 678                                                 &stat_task->sa_time_diff, &a_start);
 679                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 680                         }
 681                 }
 682                 break;
 683         case SI_CURRENT_TIME:
 684                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 685                         struct timeval tv = {sec, usec};
 686                         compute_time_diff(&tv);
 687                 }
 688                 break;
 689         case SI_FORMAT:
 690                 stat_task->current_audio_format_num
 691                         = get_audio_format_num(buf);
 692         }
 693         return 1;
 694 }
 695
 696 static int parse_stream_command(const char *txt, char **cmd)
 697 {
 698         char *p = strchr(txt, ':');
 699         int i;
 700
 701         if (!p)
 702                 return -E_MISSING_COLON;
 703         p++;
 704         FOR_EACH_AUDIO_FORMAT(i) {
 705                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 706                         continue;
 707                 *cmd = p;
 708                 return i;
 709         }
 710         return -E_UNSUPPORTED_AUDIO_FORMAT;
 711 }
 712
 713 static int add_filter(int format, char *cmdline)
 714 {
 715         struct audio_format_info *a = &afi[format];
 716         int filter_num, nf = a->num_filters;
 717
 718         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 719         if (filter_num < 0)
 720                 return filter_num;
 721         a->filter_nums[nf] = filter_num;
 722         a->num_filters++;
 723         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 724                 filters[filter_num].name);
 725         return filter_num;
 726 }
 727
 728 static int parse_writer_args(void)
 729 {
 730         int i, ret, nw;
 731         char *cmd;
 732         struct audio_format_info *a;
 733
 734         nw = PARA_MAX(1U, conf.writer_given);
 735         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 736         FOR_EACH_AUDIO_FORMAT(i) {
 737                 a = &afi[i];
 738                 a->writer_conf = para_malloc(nw * sizeof(void *));
 739                 a->writer_nums = para_malloc(nw * sizeof(int));
 740                 a->num_writers = 0;
 741         }
 742         for (i = 0; i < conf.writer_given; i++) {
 743                 void *wconf;
 744                 int writer_num;
 745                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 746                 if (ret < 0)
 747                         goto out;
 748                 a = &afi[ret];
 749                 nw = a->num_writers;
 750                 wconf = check_writer_arg(cmd, &writer_num);
 751                 if (!wconf) {
 752                         ret = writer_num;
 753                         goto out;
 754                 }
 755                 a->writer_nums[nw] = writer_num;
 756                 a->writer_conf[nw] = wconf;
 757                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 758                         nw, writer_names[writer_num]);
 759                 a->num_writers++;
 760         }
 761         ret = 1;
 762 out:
 763         return ret;
 764 }
 765
 766 static int parse_receiver_args(void)
 767 {
 768         int i, ret, receiver_num;
 769         char *cmd = NULL;
 770         struct audio_format_info *a;
 771
 772         for (i = conf.receiver_given - 1; i >= 0; i--) {
 773                 char *arg = conf.receiver_arg[i];
 774                 char *recv_arg = strchr(arg, ':');
 775                 ret = -E_MISSING_COLON;
 776                 if (!recv_arg)
 777                         goto out;
 778                 *recv_arg = '\0';
 779                 recv_arg++;
 780                 ret = get_audio_format_num(arg);
 781                 if (ret < 0)
 782                         goto out;
 783                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 784                 if (!afi[ret].receiver_conf) {
 785                         ret = -E_RECV_SYNTAX;
 786                         goto out;
 787                 }
 788                 afi[ret].receiver = &receivers[receiver_num];
 789         }
 790         /* use the first available receiver with no arguments
 791          * for those audio formats for which no receiver
 792          * was specified
 793          */
 794         cmd = para_strdup(receivers[0].name);
 795         FOR_EACH_AUDIO_FORMAT(i) {
 796                 a = &afi[i];
 797                 if (a->receiver_conf)
 798                         continue;
 799                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 800                 if (!a->receiver_conf)
 801                         return -E_RECV_SYNTAX;
 802                 a->receiver = &receivers[receiver_num];
 803         }
 804         ret = 1;
 805 out:
 806         free(cmd);
 807         return ret;
 808 }
 809
 810 static int init_default_filters(void)
 811 {
 812         int i, ret = 1;
 813
 814         FOR_EACH_AUDIO_FORMAT(i) {
 815                 struct audio_format_info *a = &afi[i];
 816                 char *tmp;
 817                 int j;
 818
 819                 if (a->num_filters)
 820                         continue; /* no default -- nothing to to */
 821                 /* add "dec" to audio format name */
 822                 tmp = make_message("%sdec", audio_formats[i]);
 823                 for (j = 0; filters[j].name; j++)
 824                         if (!strcmp(tmp, filters[j].name))
 825                                 break;
 826                 free(tmp);
 827                 ret = -E_UNSUPPORTED_FILTER;
 828                 if (!filters[j].name)
 829                         goto out;
 830                 tmp = para_strdup(filters[j].name);
 831                 ret = add_filter(i, tmp);
 832                 free(tmp);
 833                 if (ret < 0)
 834                         goto out;
 835                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 836                         filters[j].name);
 837         }
 838 out:
 839         return ret;
 840 }
 841
 842 static int parse_filter_args(void)
 843 {
 844         int i, ret, nf;
 845
 846         nf = PARA_MAX(1U, conf.filter_given);
 847         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 848         FOR_EACH_AUDIO_FORMAT(i) {
 849                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 850                 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
 851         }
 852         if (!conf.no_default_filters_given)
 853                 return init_default_filters();
 854         for (i = 0; i < conf.filter_given; i++) {
 855                 char *arg = conf.filter_arg[i];
 856                 char *filter_name = strchr(arg, ':');
 857                 ret = -E_MISSING_COLON;
 858                 if (!filter_name)
 859                         goto out;
 860                 *filter_name = '\0';
 861                 filter_name++;
 862                 ret = get_audio_format_num(arg);
 863                 if (ret < 0)
 864                         goto out;
 865                 ret = add_filter(ret, filter_name);
 866                 if (ret < 0)
 867                         goto out;
 868         }
 869         ret = init_default_filters(); /* use default values for the rest */
 870 out:
 871         return ret;
 872 }
 873
 874 static int parse_stream_args(void)
 875 {
 876         int ret;
 877
 878         ret = parse_receiver_args();
 879         if (ret < 0)
 880                 return ret;
 881         ret = parse_filter_args();
 882         if (ret < 0)
 883                 return ret;
 884         ret = parse_writer_args();
 885         if (ret < 0)
 886                 return ret;
 887         return 1;
 888 }
 889
 890 /* does not unlink socket on errors */
 891 static int audiod_get_socket(void)
 892 {
 893         struct sockaddr_un unix_addr;
 894         int ret, fd;
 895
 896         if (conf.socket_given)
 897                 socket_name = para_strdup(conf.socket_arg);
 898         else {
 899                 char *hn = para_hostname();
 900                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 901                         hn);
 902                 free(hn);
 903         }
 904         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 905         if (conf.force_given)
 906                 unlink(socket_name);
 907         ret = create_local_socket(socket_name, &unix_addr,
 908                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 909         if (ret < 0)
 910                 goto err;
 911         fd = ret;
 912         if (listen(fd , 5) < 0) {
 913                 ret = -ERRNO_TO_PARA_ERROR(errno);
 914                 goto err;
 915         }
 916         ret = mark_fd_nonblocking(fd);
 917         if (ret < 0)
 918                 goto err;
 919         return fd;
 920 err:
 921         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 922         exit(EXIT_FAILURE);
 923 }
 924
 925 static void signal_pre_select(struct sched *s, struct task *t)
 926 {
 927         struct signal_task *st = container_of(t, struct signal_task, task);
 928         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 929 }
 930
 931 static void signal_post_select(struct sched *s, struct task *t)
 932 {
 933         struct signal_task *st = container_of(t, struct signal_task, task);
 934
 935         if (!FD_ISSET(st->fd, &s->rfds))
 936                 return;
 937
 938         st->signum = para_next_signal();
 939         switch (st->signum) {
 940         case SIGINT:
 941         case SIGTERM:
 942         case SIGHUP:
 943                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 944                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 945         }
 946 }
 947
 948 static void signal_setup_default(struct signal_task *st)
 949 {
 950         st->task.pre_select = signal_pre_select;
 951         st->task.post_select = signal_post_select;
 952         sprintf(st->task.status, "signal task");
 953 }
 954
 955 static void command_pre_select(struct sched *s, struct task *t)
 956 {
 957         struct command_task *ct = container_of(t, struct command_task, task);
 958         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 959 }
 960
 961 static void command_post_select(struct sched *s, struct task *t)
 962 {
 963         int ret;
 964         struct command_task *ct = container_of(t, struct command_task, task);
 965         static struct timeval last_status_dump;
 966         struct timeval tmp, delay = {0, 500 * 1000};
 967
 968         tv_add(&last_status_dump, &delay, &tmp);
 969         if (tv_diff(&tmp, now, NULL) < 0) {
 970                 audiod_status_dump();
 971                 last_status_dump = *now;
 972         }
 973
 974         if (!FD_ISSET(ct->fd, &s->rfds))
 975                 return;
 976         ret = handle_connect(ct->fd);
 977         if (ret < 0)
 978                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 979 }
 980
 981 static void init_command_task(struct command_task *ct)
 982 {
 983         ct->task.pre_select = command_pre_select;
 984         ct->task.post_select = command_post_select;
 985         ct->task.error = 0;
 986         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 987         sprintf(ct->task.status, "command task");
 988 }
 989
 990 static void close_stat_pipe(void)
 991 {
 992         if (!stat_task->ct)
 993                 return;
 994         client_close(stat_task->ct);
 995         stat_task->ct = NULL;
 996         clear_and_dump_items();
 997         stat_task->length_seconds = 0;
 998         stat_task->offset_seconds = 0;
 999         stat_task->vss_status = 0;
1000         stat_task->current_audio_format_num = -1;
1001         audiod_status_dump();
1002 }
1003
1004 /**
1005  * close the connection to para_server and exit
1006  *
1007  * \param status the exit status which is passed to exit(3)
1008  * \param msg the log message
1009  *
1010  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1011  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1012  * EXIT_FAILURE.
1013  *
1014  * \sa exit(3)
1015  */
1016 void __noreturn clean_exit(int status, const char *msg)
1017 {
1018         PARA_EMERG_LOG("%s\n", msg);
1019         if (socket_name)
1020                 unlink(socket_name);
1021         close_stat_pipe();
1022         exit(status);
1023 }
1024
1025 /* avoid busy loop if server is down */
1026 static void set_stat_task_restart_barrier(unsigned seconds)
1027 {
1028         struct timeval delay = {seconds, 0};
1029         tv_add(now, &delay, &stat_task->restart_barrier);
1030 }
1031
1032 static void try_to_close_slot(int slot_num)
1033 {
1034         struct slot_info *s = &slot[slot_num];
1035         struct audio_format_info *a = afi + s->format;
1036         int i;
1037
1038         if (s->format < 0)
1039                 return;
1040         if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1041                 return;
1042         for (i = 0; i < a->num_filters; i++)
1043                 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1044                         return;
1045         for (i = 0; i < a->num_writers; i++)
1046                 if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1047                         return;
1048         PARA_INFO_LOG("closing slot %d\n", slot_num);
1049         close_writers(s);
1050         _close_filters(s);
1051         close_receiver(slot_num);
1052         clear_slot(slot_num);
1053 }
1054
1055 /*
1056  * Check if any receivers/filters/writers need to be started and do so if
1057  * necessary.
1058  */
1059 static void start_stop_decoders(struct sched *s)
1060 {
1061         int i, ret;
1062         struct slot_info *sl;
1063         struct audio_format_info *a;
1064
1065         FOR_EACH_SLOT(i)
1066                 try_to_close_slot(i);
1067 //      if (audiod_status != AUDIOD_ON ||
1068 //                      !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1069 //              return kill_all_decoders(-E_NOT_PLAYING);
1070         ret = open_current_receiver(s);
1071         if (ret < 0)
1072                 return;
1073         sl = slot + ret;
1074         a = afi + sl->format;
1075         if (a->num_filters)
1076                 open_filters(sl);
1077         open_writers(sl);
1078         activate_grab_clients();
1079         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1080         s->timeout.tv_sec = 0;
1081         s->timeout.tv_usec = 1;
1082 }
1083
1084 /* restart the client task if necessary */
1085 static void status_pre_select(struct sched *s, struct task *t)
1086 {
1087         struct status_task *st = container_of(t, struct status_task, task);
1088
1089         if (audiod_status == AUDIOD_OFF) {
1090                 if (!st->ct)
1091                         goto out;
1092                 if (st->ct->task.error >= 0) {
1093                         st->ct->task.error = -E_AUDIOD_OFF;
1094                         goto out;
1095                 }
1096                 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1097                         goto out;
1098                 close_stat_pipe();
1099                 st->clock_diff_count = conf.clock_diff_count_arg;
1100                 goto out;
1101         }
1102         if (st->ct) {
1103                 int ret;
1104                 if (st->ct->task.error < 0) {
1105                         if (st->ct->task.error != -E_TASK_UNREGISTERED)
1106                                 goto out;
1107                         close_stat_pipe();
1108                         goto out;
1109                 }
1110                 if (st->ct->status != CL_RECEIVING)
1111                         goto out;
1112                 ret = for_each_stat_item(st->ct->buf, st->ct->loaded,
1113                         update_item);
1114                 if (ret < 0) {
1115                         st->ct->task.error = ret;
1116                         goto out;
1117                 }
1118                 if (st->ct->loaded != ret) {
1119                         st->last_status_read = *now;
1120                         st->ct->loaded = ret;
1121                 } else {
1122                         struct timeval diff;
1123                         tv_diff(now, &st->last_status_read, &diff);
1124                         if (diff.tv_sec > 61)
1125                                 st->ct->task.error = -E_STATUS_TIMEOUT;
1126                 }
1127                 goto out;
1128         }
1129         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1130                 goto out;
1131         if (st->clock_diff_count) { /* get status only one time */
1132                 char *argv[] = {"audiod", "--", "stat", "-p", "1", NULL};
1133                 int argc = 5;
1134                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1135                 st->clock_diff_count--;
1136                 client_open(argc, argv, &st->ct, NULL);
1137                 set_stat_task_restart_barrier(2);
1138
1139         } else {
1140                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1141                 int argc = 4;
1142                 client_open(argc, argv, &st->ct, NULL);
1143                 set_stat_task_restart_barrier(5);
1144         }
1145         free(stat_item_values[SI_BASENAME]);
1146         stat_item_values[SI_BASENAME] = para_strdup(
1147                 "no connection to para_server");
1148         stat_client_write_item(SI_BASENAME);
1149         st->last_status_read = *now;
1150 out:
1151         start_stop_decoders(s);
1152 }
1153
1154 static void init_status_task(struct status_task *st)
1155 {
1156         memset(st, 0, sizeof(struct status_task));
1157         st->task.pre_select = status_pre_select;
1158         st->sa_time_diff_sign = 1;
1159         st->clock_diff_count = conf.clock_diff_count_arg;
1160         st->current_audio_format_num = -1;
1161         sprintf(st->task.status, "status task");
1162 }
1163
1164 static void set_initial_status(void)
1165 {
1166         audiod_status = AUDIOD_ON;
1167         if (!conf.mode_given)
1168                 return;
1169         if (!strcmp(conf.mode_arg, "sb")) {
1170                 audiod_status = AUDIOD_STANDBY;
1171                 return;
1172         }
1173         if (!strcmp(conf.mode_arg, "off")) {
1174                 audiod_status = AUDIOD_OFF;
1175                 return;
1176         }
1177         if (strcmp(conf.mode_arg, "on"))
1178                 PARA_WARNING_LOG("invalid mode\n");
1179 }
1180
1181 __noreturn static void print_help_and_die(void)
1182 {
1183         int d = conf.detailed_help_given;
1184         const char **p = d? audiod_args_info_detailed_help
1185                 : audiod_args_info_help;
1186
1187         printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1188                 AUDIOD_CMDLINE_PARSER_VERSION);
1189         printf_or_die("%s\n\n", audiod_args_info_usage);
1190         for (; *p; p++)
1191                 printf_or_die("%s\n", *p);
1192         print_receiver_helps(d);
1193         print_filter_helps(d);
1194         print_writer_helps(d);
1195         exit(0);
1196 }
1197
1198 static void init_colors_or_die(void)
1199 {
1200         int ret, i;
1201
1202         if (!want_colors())
1203                 return;
1204         daemon_set_default_log_colors();
1205         daemon_set_flag(DF_COLOR_LOG);
1206         for (i = 0; i < conf.log_color_given; i++) {
1207                 ret = daemon_set_log_color(conf.log_color_arg[i]);
1208                 if (ret < 0)
1209                         exit(EXIT_FAILURE);
1210         }
1211 }
1212
1213 /**
1214  * the main function of para_audiod
1215  *
1216  * \param argc usual argument count
1217  * \param argv usual argument vector
1218  *
1219  * \return EXIT_SUCCESS or EXIT_FAILURE
1220  *
1221  * \sa para_audiod(1)
1222  * */
1223 int main(int argc, char *argv[])
1224 {
1225         int ret, i;
1226         static struct sched s;
1227         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1228         struct audiod_cmdline_parser_params params = {
1229                 .override = 0,
1230                 .initialize = 1,
1231                 .check_required = 0,
1232                 .check_ambiguity = 0,
1233                 .print_errors = 1
1234         };
1235
1236         valid_fd_012();
1237         if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1238                 exit(EXIT_FAILURE);
1239         HANDLE_VERSION_FLAG("audiod", conf);
1240         /* init receivers/filters/writers early to make help work */
1241         recv_init();
1242         filter_init();
1243         writer_init();
1244         if (conf.help_given || conf.detailed_help_given)
1245                 print_help_and_die();
1246         drop_privileges_or_die(conf.user_arg, conf.group_arg);
1247         parse_config_or_die();
1248         init_colors_or_die();
1249         init_random_seed_or_die();
1250         daemon_set_flag(DF_LOG_TIME);
1251         daemon_set_flag(DF_LOG_HOSTNAME);
1252         daemon_set_flag(DF_LOG_LL);
1253         if (conf.log_timing_given)
1254                 daemon_set_flag(DF_LOG_TIMING);
1255         if (conf.logfile_given) {
1256                 daemon_set_logfile(conf.logfile_arg);
1257                 daemon_open_log_or_die();
1258         }
1259         ret = parse_stream_args();
1260         if (ret < 0) {
1261                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1262                 exit(EXIT_FAILURE);
1263         }
1264         log_welcome("para_audiod");
1265         server_uptime(UPTIME_SET);
1266         set_initial_status();
1267         FOR_EACH_SLOT(i)
1268                 clear_slot(i);
1269         setup_signal_handling();
1270         signal_setup_default(sig_task);
1271
1272         init_status_task(stat_task);
1273         init_command_task(cmd_task);
1274
1275         if (conf.daemon_given)
1276                 daemonize();
1277
1278         register_task(&sig_task->task);
1279         register_task(&cmd_task->task);
1280         register_task(&stat_task->task);
1281         s.default_timeout.tv_sec = 2;
1282         s.default_timeout.tv_usec = 999 * 1000;
1283         ret = schedule(&s);
1284
1285         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1286         return EXIT_FAILURE;
1287 }