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         /*
 200          * Valid status items and playing, set length and tmp to the stream
 201          * start. We use the slot info and fall back to the info from current
 202          * status items if no slot info is available.
 203          */
 204         length = stat_task->length_seconds;
 205         tmp = &stat_task->server_stream_start;
 206         if (s && s->wns) { /* writer active in this slot */
 207                 btr_get_node_start(s->wns[0].btrn, &wstime);
 208                 if (wstime.tv_sec != 0) { /* writer wrote something */
 209                         if (s->server_stream_start.tv_sec == 0) {
 210                                 /* copy status info to slot */
 211                                 s->server_stream_start = stat_task->server_stream_start;
 212                                 s->offset_seconds = stat_task->offset_seconds;
 213                                 s->seconds_total = stat_task->length_seconds;
 214                         }
 215                         length = s->seconds_total;
 216                         tmp = &s->server_stream_start;
 217                 }
 218         }
 219         if (stat_task->sa_time_diff_sign > 0)
 220                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
 221         else
 222                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
 223         if (!s || !s->wns) {
 224                 struct timeval diff;
 225                 tv_diff(now, &sss, &diff);
 226                 seconds = diff.tv_sec + stat_task->offset_seconds;
 227                 goto out;
 228         }
 229         tv_diff(now, &wstime, &wtime);
 230         //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
 231         seconds = s->offset_seconds;
 232         btr_get_node_start(s->receiver_node->btrn, &rstime);
 233         ret = tv_diff(&rstime, &sss, &rskip);
 234         if (ret > 0) { /* audiod was started in the middle of the stream */
 235                 tv_add(&wtime, &rskip, &sum);
 236                 seconds += sum.tv_sec;
 237         } else
 238                 seconds += wtime.tv_sec;
 239 out:
 240         seconds = PARA_MIN(seconds, length);
 241         seconds = PARA_MAX(seconds, 0);
 242         msg = make_message(
 243                 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
 244                 s? "" : "~",
 245                 seconds / 60,
 246                 seconds % 60,
 247                 (length - seconds) / 60,
 248                 (length - seconds) % 60,
 249                 length? (seconds * 100 + length / 2) / length : 0,
 250                 length / 60,
 251                 length % 60
 252         );
 253         PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
 254         return msg;
 255 empty:
 256         return para_strdup(NULL);
 257 }
 258
 259 static int want_colors(void)
 260 {
 261         if (conf.color_arg == color_arg_no)
 262                 return 0;
 263         if (conf.color_arg == color_arg_yes)
 264                 return 1;
 265         if (conf.logfile_given)
 266                 return 0;
 267         return isatty(STDERR_FILENO);
 268 }
 269
 270 static void parse_config_or_die(void)
 271 {
 272         int ret;
 273         char *config_file;
 274         struct audiod_cmdline_parser_params params = {
 275                 .override = 0,
 276                 .initialize = 0,
 277                 .check_required = 1,
 278                 .check_ambiguity = 0,
 279                 .print_errors = 1
 280         };
 281
 282         if (conf.config_file_given)
 283                 config_file = para_strdup(conf.config_file_arg);
 284         else {
 285                 char *home = para_homedir();
 286                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 287                 free(home);
 288         }
 289         ret = file_exists(config_file);
 290         if (conf.config_file_given && !ret) {
 291                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 292                 goto err;
 293         }
 294         if (ret)
 295                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 296         free(config_file);
 297         daemon_set_loglevel(conf.loglevel_arg);
 298         return;
 299 err:
 300         free(config_file);
 301         exit(EXIT_FAILURE);
 302 }
 303
 304 static void setup_signal_handling(void)
 305 {
 306         sig_task->fd = para_signal_init();
 307         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 308         para_install_sighandler(SIGINT);
 309         para_install_sighandler(SIGTERM);
 310         para_install_sighandler(SIGHUP);
 311         para_sigaction(SIGPIPE, SIG_IGN);
 312 }
 313
 314 static void clear_slot(int slot_num)
 315 {
 316         struct slot_info *s = &slot[slot_num];
 317
 318         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 319         memset(s, 0, sizeof(struct slot_info));
 320         s->format = -1;
 321 }
 322
 323 static void close_receiver(int slot_num)
 324 {
 325         struct slot_info *s = &slot[slot_num];
 326         struct audio_format_info *a;
 327         struct timeval restart_delay = {0, 200 * 1000};
 328
 329         if (s->format < 0 || !s->receiver_node)
 330                 return;
 331         a = &afi[s->format];
 332         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 333                 audio_formats[s->format], slot_num);
 334         a->receiver->close(s->receiver_node);
 335         btr_free_node(s->receiver_node->btrn);
 336         free(s->receiver_node);
 337         s->receiver_node = NULL;
 338         tv_add(now, &restart_delay, &afi[s->format].restart_barrier);
 339 }
 340
 341 static void writer_cleanup(struct writer_node *wn)
 342 {
 343         struct writer *w = writers + wn->writer_num;
 344
 345         w->close(wn);
 346         btr_free_node(wn->btrn);
 347 }
 348
 349 static void close_writers(struct slot_info *s)
 350 {
 351         struct audio_format_info *a;
 352         int i;
 353
 354         if (s->format < 0)
 355                 return;
 356         a = afi + s->format;
 357         if (a->num_writers == 0)
 358                 writer_cleanup(s->wns);
 359         else {
 360                 for (i = 0; i < a->num_writers; i++)
 361                         writer_cleanup(s->wns + i);
 362         }
 363         free(s->wns);
 364         s->wns = NULL;
 365 }
 366
 367 static void _close_filters(struct slot_info *s)
 368 {
 369         int i;
 370         struct audio_format_info *a = afi + s->format;
 371         if (a->num_filters == 0)
 372                 return;
 373         for (i = 0; i < a->num_filters; i++) {
 374                 struct filter_node *fn = s->fns + i;
 375                 struct filter *f = filters + fn->filter_num;
 376
 377                 f->close(fn);
 378                 btr_free_node(fn->btrn);
 379         }
 380         free(s->fns);
 381         s->fns = NULL;
 382 }
 383
 384 static void kill_all_decoders(int error)
 385 {
 386         int i, j;
 387
 388         FOR_EACH_SLOT(i) {
 389                 struct slot_info *s = &slot[i];
 390                 struct audio_format_info *a;
 391                 if (s->format < 0)
 392                         continue;
 393                 a = afi + s->format;
 394                 if (s->wns)
 395                         for (j = 0; j < a->num_writers; j++)
 396                                 s->wns[j].task.error = error;
 397                 if (s->fns)
 398                         for (j = 0; j < a->num_writers; j++)
 399                                 s->fns[j].task.error = error;
 400                 if (s->receiver_node)
 401                         s->receiver_node->task.error = error;
 402         }
 403 }
 404
 405 static int get_empty_slot(void)
 406 {
 407         int i;
 408         struct slot_info *s;
 409
 410         FOR_EACH_SLOT(i) {
 411                 s = &slot[i];
 412                 if (s->format < 0) {
 413                         clear_slot(i);
 414                         return i;
 415                 }
 416                 if (s->wns || s->receiver_node || s->fns)
 417                         continue;
 418                 clear_slot(i);
 419                 return i;
 420         }
 421         return -E_NO_MORE_SLOTS;
 422 }
 423
 424 /**
 425  * get the number of filters
 426  *
 427  * \param audio_format_num the number identifying the audio format
 428  *
 429  * \return the number of filters for the given audio format
 430  *
 431  * \sa struct filter;
 432  */
 433 int num_filters(int audio_format_num)
 434 {
 435         return afi[audio_format_num].num_filters;
 436 }
 437
 438 static void open_filters(struct slot_info *s)
 439 {
 440         struct audio_format_info *a = afi + s->format;
 441         struct filter_node *fn;
 442         int nf = a->num_filters;
 443         struct btr_node *parent;
 444         int i;
 445
 446         if (nf == 0)
 447                 return;
 448         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 449         assert(s->fns == NULL);
 450         s->fns = para_calloc(nf * sizeof(struct filter_node));
 451         parent = s->receiver_node->btrn;
 452         for (i = 0; i < nf; i++) {
 453                 struct filter *f = filters + a->filter_nums[i];
 454                 fn = s->fns + i;
 455                 fn->filter_num = a->filter_nums[i];
 456                 fn->conf = a->filter_conf[i];
 457                 fn->task.pre_select = f->pre_select;
 458                 fn->task.post_select = f->post_select;
 459                 fn->btrn = btr_new_node(f->name, parent, f->execute, fn);
 460                 f->open(fn);
 461                 register_task(&fn->task);
 462                 parent = fn->btrn;
 463                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 464                         audio_formats[s->format], i,  nf, f->name, s - slot);
 465                 sprintf(fn->task.status, "%s (slot %d)", f->name, s - slot);
 466         }
 467 }
 468
 469 static void open_writers(struct slot_info *s)
 470 {
 471         int i;
 472         struct audio_format_info *a = afi + s->format;
 473         struct writer_node *wn;
 474         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
 475
 476         assert(s->wns == NULL);
 477         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
 478                 * sizeof(struct writer_node));
 479         if (a->num_writers == 0)
 480                 setup_writer_node(NULL, parent, s->wns);
 481         else {
 482                 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 483                 for (i = 0; i < a->num_writers; i++) {
 484                         wn = s->wns + i;
 485                         wn->conf = a->writer_conf[i];
 486                         wn->writer_num = a->writer_nums[i];
 487                         register_writer_node(wn, parent);
 488                 }
 489         }
 490 }
 491
 492 /* returns slot num on success */
 493 static int open_receiver(int format)
 494 {
 495         struct audio_format_info *a = &afi[format];
 496         struct slot_info *s;
 497         int ret, slot_num;
 498         struct receiver *r = a->receiver;
 499         struct receiver_node *rn;
 500         const struct timeval restart_delay = {2, 0};
 501
 502         ret = get_empty_slot();
 503         if (ret < 0)
 504                 goto err;
 505         slot_num = ret;
 506         s = &slot[slot_num];
 507         s->format = format;
 508         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 509         rn = s->receiver_node;
 510         rn->receiver = r;
 511         rn->conf = a->receiver_conf;
 512         rn->btrn = btr_new_node(r->name, NULL, NULL, rn);
 513         ret = r->open(rn);
 514         if (ret < 0) {
 515                 btr_free_node(rn->btrn);
 516                 free(rn);
 517                 s->receiver_node = NULL;
 518                 goto err;
 519         }
 520         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 521                 audio_formats[s->format], r->name, slot_num);
 522         rn->task.pre_select = r->pre_select;
 523         rn->task.post_select = r->post_select;
 524         sprintf(rn->task.status, "%s receiver node", r->name);
 525         register_task(&rn->task);
 526         ret = slot_num;
 527 err:
 528         if (ret < 0)
 529                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 530         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 531         return ret;
 532 }
 533
 534 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
 535 static int receiver_running(int format)
 536 {
 537         int i, ret = 0;
 538
 539         FOR_EACH_SLOT(i) {
 540                 struct slot_info *s = &slot[i];
 541                 if (s->format != format)
 542                         continue;
 543                 if (!s->receiver_node)
 544                         continue;
 545                 if (s->receiver_node->task.error >= 0)
 546                         return 1;
 547                 ret = -1;
 548         }
 549         return ret;
 550 }
 551
 552 struct btr_node *audiod_get_btr_root(void)
 553 {
 554         int i, newest_slot = -1;
 555         struct timeval newest_rstime = {0, 0};
 556
 557         FOR_EACH_SLOT(i) {
 558                 struct slot_info *s = &slot[i];
 559                 struct timeval rstime;
 560                 if (!s->receiver_node)
 561                         continue;
 562                 if (s->receiver_node->task.error < 0)
 563                         continue;
 564                 btr_get_node_start(s->receiver_node->btrn, &rstime);
 565                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
 566                         continue;
 567                 newest_rstime = rstime;
 568                 newest_slot = i;
 569         }
 570         if (newest_slot == -1)
 571                 return NULL;
 572         return slot[newest_slot].receiver_node->btrn;
 573 }
 574
 575 /* returns slot num on success. */
 576 static int open_current_receiver(struct sched *s)
 577 {
 578         struct timeval diff;
 579         int ret, cafn = stat_task->current_audio_format_num;
 580
 581         if (cafn < 0 || !stat_task->ct)
 582                 return -1;
 583         /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
 584         if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
 585                 return -1;
 586         ret = receiver_running(cafn);
 587         if (ret > 0) /* already running and not eof */
 588                 return -1;
 589         if (ret < 0) { /* eof */
 590                 /*
 591                  * para_server uses a zero start time during the announcement
 592                  * period, i.e. before it sends the first chunk. Wait until
 593                  * this period begins to avoid restarting the receiver that
 594                  * belongs to the file just completed.
 595                  */
 596                 if (stat_task->server_stream_start.tv_sec != 0)
 597                         sched_request_timeout_ms(100, s);
 598         }
 599         if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
 600                 if (tv_diff(&s->timeout, &diff, NULL) > 0)
 601                         s->timeout = diff;
 602                 else
 603                         sched_min_delay(s);
 604                 return -1;
 605         }
 606         /* start a new receiver */
 607         return open_receiver(cafn);
 608 }
 609
 610 static unsigned compute_time_diff(const struct timeval *status_time)
 611 {
 612         struct timeval tmp, diff;
 613         static unsigned count;
 614         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 615         const struct timeval max_deviation = {0, 500 * 1000};
 616         const int time_smooth = 5;
 617
 618         if (!status_time)
 619                 return count;
 620         sign = tv_diff(status_time, now, &diff);
 621 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 622 //                      sign, sa_time_diff_sign);
 623         if (!count) {
 624                 sa_time_diff_sign = sign;
 625                 stat_task->sa_time_diff = diff;
 626                 count++;
 627                 goto out;
 628         }
 629         if (count > 5) {
 630                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 631                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 632                         PARA_WARNING_LOG("time diff jump: %lims\n",
 633                                 s * tv2ms(&tmp));
 634         }
 635         count++;
 636         sa_time_diff_sign = tv_convex_combination(
 637                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 638                 count > 10? sign : sign * time_smooth, &diff,
 639                 &tmp);
 640         stat_task->sa_time_diff = tmp;
 641         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 642                 sign > 0? "+" : "-",
 643                 tv2ms(&diff),
 644                 sa_time_diff_sign ? "+" : "-",
 645                 tv2ms(&stat_task->sa_time_diff)
 646         );
 647 out:
 648         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 649         return count;
 650 }
 651
 652 static int update_item(int itemnum, char *buf)
 653 {
 654         long unsigned sec, usec;
 655
 656         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 657                 return 1;
 658         free(stat_item_values[itemnum]);
 659         stat_item_values[itemnum] = para_strdup(buf);
 660         stat_client_write_item(itemnum);
 661         switch (itemnum) {
 662         case SI_STATUS_FLAGS:
 663                 stat_task->vss_status = 0;
 664                 if (strchr(buf, 'N'))
 665                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 666                 if (strchr(buf, 'P'))
 667                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 668                 break;
 669         case SI_OFFSET:
 670                 stat_task->offset_seconds = atoi(buf);
 671                 break;
 672         case SI_SECONDS_TOTAL:
 673                 stat_task->length_seconds = atoi(buf);
 674                 break;
 675         case SI_STREAM_START:
 676                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 677                         struct timeval a_start, delay;
 678                         delay.tv_sec = conf.stream_delay_arg / 1000;
 679                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 680                         stat_task->server_stream_start.tv_sec = sec;
 681                         stat_task->server_stream_start.tv_usec = usec;
 682                         if (compute_time_diff(NULL) > 2) {
 683                                 if (stat_task->sa_time_diff_sign < 0)
 684                                         tv_add(&stat_task->server_stream_start,
 685                                                 &stat_task->sa_time_diff, &a_start);
 686                                 else
 687                                         tv_diff(&stat_task->server_stream_start,
 688                                                 &stat_task->sa_time_diff, &a_start);
 689                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 690                         }
 691                 }
 692                 break;
 693         case SI_CURRENT_TIME:
 694                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 695                         struct timeval tv = {sec, usec};
 696                         compute_time_diff(&tv);
 697                 }
 698                 break;
 699         case SI_FORMAT:
 700                 stat_task->current_audio_format_num
 701                         = get_audio_format_num(buf);
 702         }
 703         return 1;
 704 }
 705
 706 static int parse_stream_command(const char *txt, char **cmd)
 707 {
 708         char *p = strchr(txt, ':');
 709         int i;
 710
 711         if (!p)
 712                 return -E_MISSING_COLON;
 713         p++;
 714         FOR_EACH_AUDIO_FORMAT(i) {
 715                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 716                         continue;
 717                 *cmd = p;
 718                 return i;
 719         }
 720         return -E_UNSUPPORTED_AUDIO_FORMAT;
 721 }
 722
 723 static int add_filter(int format, char *cmdline)
 724 {
 725         struct audio_format_info *a = &afi[format];
 726         int filter_num, nf = a->num_filters;
 727
 728         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 729         if (filter_num < 0)
 730                 return filter_num;
 731         a->filter_nums[nf] = filter_num;
 732         a->num_filters++;
 733         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 734                 filters[filter_num].name);
 735         return filter_num;
 736 }
 737
 738 static int parse_writer_args(void)
 739 {
 740         int i, ret, nw;
 741         char *cmd;
 742         struct audio_format_info *a;
 743
 744         nw = PARA_MAX(1U, conf.writer_given);
 745         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 746         FOR_EACH_AUDIO_FORMAT(i) {
 747                 a = &afi[i];
 748                 a->writer_conf = para_malloc(nw * sizeof(void *));
 749                 a->writer_nums = para_malloc(nw * sizeof(int));
 750                 a->num_writers = 0;
 751         }
 752         for (i = 0; i < conf.writer_given; i++) {
 753                 void *wconf;
 754                 int writer_num;
 755                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 756                 if (ret < 0)
 757                         goto out;
 758                 a = &afi[ret];
 759                 nw = a->num_writers;
 760                 wconf = check_writer_arg(cmd, &writer_num);
 761                 if (!wconf) {
 762                         ret = writer_num;
 763                         goto out;
 764                 }
 765                 a->writer_nums[nw] = writer_num;
 766                 a->writer_conf[nw] = wconf;
 767                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 768                         nw, writer_names[writer_num]);
 769                 a->num_writers++;
 770         }
 771         ret = 1;
 772 out:
 773         return ret;
 774 }
 775
 776 static int parse_receiver_args(void)
 777 {
 778         int i, ret, receiver_num;
 779         char *cmd = NULL;
 780         struct audio_format_info *a;
 781
 782         for (i = conf.receiver_given - 1; i >= 0; i--) {
 783                 char *arg = conf.receiver_arg[i];
 784                 char *recv_arg = strchr(arg, ':');
 785                 ret = -E_MISSING_COLON;
 786                 if (!recv_arg)
 787                         goto out;
 788                 *recv_arg = '\0';
 789                 recv_arg++;
 790                 ret = get_audio_format_num(arg);
 791                 if (ret < 0)
 792                         goto out;
 793                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 794                 if (!afi[ret].receiver_conf) {
 795                         ret = -E_RECV_SYNTAX;
 796                         goto out;
 797                 }
 798                 afi[ret].receiver = &receivers[receiver_num];
 799         }
 800         /* use the first available receiver with no arguments
 801          * for those audio formats for which no receiver
 802          * was specified
 803          */
 804         cmd = para_strdup(receivers[0].name);
 805         FOR_EACH_AUDIO_FORMAT(i) {
 806                 a = &afi[i];
 807                 if (a->receiver_conf)
 808                         continue;
 809                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 810                 if (!a->receiver_conf)
 811                         return -E_RECV_SYNTAX;
 812                 a->receiver = &receivers[receiver_num];
 813         }
 814         ret = 1;
 815 out:
 816         free(cmd);
 817         return ret;
 818 }
 819
 820 static int init_default_filters(void)
 821 {
 822         int i, ret = 1;
 823
 824         FOR_EACH_AUDIO_FORMAT(i) {
 825                 struct audio_format_info *a = &afi[i];
 826                 char *tmp;
 827                 int j;
 828
 829                 if (a->num_filters)
 830                         continue; /* no default -- nothing to to */
 831                 /* add "dec" to audio format name */
 832                 tmp = make_message("%sdec", audio_formats[i]);
 833                 for (j = 0; filters[j].name; j++)
 834                         if (!strcmp(tmp, filters[j].name))
 835                                 break;
 836                 free(tmp);
 837                 ret = -E_UNSUPPORTED_FILTER;
 838                 if (!filters[j].name)
 839                         goto out;
 840                 tmp = para_strdup(filters[j].name);
 841                 ret = add_filter(i, tmp);
 842                 free(tmp);
 843                 if (ret < 0)
 844                         goto out;
 845                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 846                         filters[j].name);
 847         }
 848 out:
 849         return ret;
 850 }
 851
 852 static int parse_filter_args(void)
 853 {
 854         int i, ret, nf;
 855
 856         nf = PARA_MAX(1U, conf.filter_given);
 857         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 858         FOR_EACH_AUDIO_FORMAT(i) {
 859                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 860                 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
 861         }
 862         if (!conf.no_default_filters_given)
 863                 return init_default_filters();
 864         for (i = 0; i < conf.filter_given; i++) {
 865                 char *arg = conf.filter_arg[i];
 866                 char *filter_name = strchr(arg, ':');
 867                 ret = -E_MISSING_COLON;
 868                 if (!filter_name)
 869                         goto out;
 870                 *filter_name = '\0';
 871                 filter_name++;
 872                 ret = get_audio_format_num(arg);
 873                 if (ret < 0)
 874                         goto out;
 875                 ret = add_filter(ret, filter_name);
 876                 if (ret < 0)
 877                         goto out;
 878         }
 879         ret = init_default_filters(); /* use default values for the rest */
 880 out:
 881         return ret;
 882 }
 883
 884 static int parse_stream_args(void)
 885 {
 886         int ret;
 887
 888         ret = parse_receiver_args();
 889         if (ret < 0)
 890                 return ret;
 891         ret = parse_filter_args();
 892         if (ret < 0)
 893                 return ret;
 894         ret = parse_writer_args();
 895         if (ret < 0)
 896                 return ret;
 897         return 1;
 898 }
 899
 900 /* does not unlink socket on errors */
 901 static int audiod_get_socket(void)
 902 {
 903         struct sockaddr_un unix_addr;
 904         int ret, fd;
 905
 906         if (conf.socket_given)
 907                 socket_name = para_strdup(conf.socket_arg);
 908         else {
 909                 char *hn = para_hostname();
 910                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 911                         hn);
 912                 free(hn);
 913         }
 914         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 915         if (conf.force_given)
 916                 unlink(socket_name);
 917         ret = create_local_socket(socket_name, &unix_addr,
 918                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 919         if (ret < 0)
 920                 goto err;
 921         fd = ret;
 922         if (listen(fd , 5) < 0) {
 923                 ret = -ERRNO_TO_PARA_ERROR(errno);
 924                 goto err;
 925         }
 926         ret = mark_fd_nonblocking(fd);
 927         if (ret < 0)
 928                 goto err;
 929         return fd;
 930 err:
 931         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 932         exit(EXIT_FAILURE);
 933 }
 934
 935 static void signal_pre_select(struct sched *s, struct task *t)
 936 {
 937         struct signal_task *st = container_of(t, struct signal_task, task);
 938         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 939 }
 940
 941 static void signal_post_select(struct sched *s, struct task *t)
 942 {
 943         struct signal_task *st = container_of(t, struct signal_task, task);
 944
 945         if (!FD_ISSET(st->fd, &s->rfds))
 946                 return;
 947
 948         st->signum = para_next_signal();
 949         switch (st->signum) {
 950         case SIGINT:
 951         case SIGTERM:
 952         case SIGHUP:
 953                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 954                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 955         }
 956 }
 957
 958 static void signal_setup_default(struct signal_task *st)
 959 {
 960         st->task.pre_select = signal_pre_select;
 961         st->task.post_select = signal_post_select;
 962         sprintf(st->task.status, "signal task");
 963 }
 964
 965 static void command_pre_select(struct sched *s, struct task *t)
 966 {
 967         struct command_task *ct = container_of(t, struct command_task, task);
 968         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 969 }
 970
 971 static void command_post_select(struct sched *s, struct task *t)
 972 {
 973         int ret;
 974         struct command_task *ct = container_of(t, struct command_task, task);
 975         static struct timeval last_status_dump;
 976         struct timeval tmp, delay = {0, 500 * 1000};
 977
 978         tv_add(&last_status_dump, &delay, &tmp);
 979         if (tv_diff(&tmp, now, NULL) < 0) {
 980                 audiod_status_dump();
 981                 last_status_dump = *now;
 982         }
 983
 984         if (!FD_ISSET(ct->fd, &s->rfds))
 985                 return;
 986         ret = handle_connect(ct->fd);
 987         if (ret < 0)
 988                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 989 }
 990
 991 static void init_command_task(struct command_task *ct)
 992 {
 993         ct->task.pre_select = command_pre_select;
 994         ct->task.post_select = command_post_select;
 995         ct->task.error = 0;
 996         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 997         sprintf(ct->task.status, "command task");
 998 }
 999
1000 static void close_stat_pipe(void)
1001 {
1002         if (!stat_task->ct)
1003                 return;
1004         client_close(stat_task->ct);
1005         stat_task->ct = NULL;
1006         clear_and_dump_items();
1007         stat_task->length_seconds = 0;
1008         stat_task->offset_seconds = 0;
1009         stat_task->vss_status = 0;
1010         stat_task->current_audio_format_num = -1;
1011         audiod_status_dump();
1012 }
1013
1014 /**
1015  * close the connection to para_server and exit
1016  *
1017  * \param status the exit status which is passed to exit(3)
1018  * \param msg the log message
1019  *
1020  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1021  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1022  * EXIT_FAILURE.
1023  *
1024  * \sa exit(3)
1025  */
1026 void __noreturn clean_exit(int status, const char *msg)
1027 {
1028         PARA_EMERG_LOG("%s\n", msg);
1029         if (socket_name)
1030                 unlink(socket_name);
1031         close_stat_pipe();
1032         exit(status);
1033 }
1034
1035 /* avoid busy loop if server is down */
1036 static void set_stat_task_restart_barrier(unsigned seconds)
1037 {
1038         struct timeval delay = {seconds, 0};
1039         tv_add(now, &delay, &stat_task->restart_barrier);
1040 }
1041
1042 static bool try_to_close_slot(int slot_num)
1043 {
1044         struct slot_info *s = &slot[slot_num];
1045         struct audio_format_info *a = afi + s->format;
1046         int i;
1047
1048         if (s->format < 0)
1049                 return false;
1050         if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1051                 return false;
1052         for (i = 0; i < a->num_filters; i++)
1053                 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1054                         return false;
1055         for (i = 0; i < a->num_writers; i++)
1056                 if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1057                         return false;
1058         PARA_INFO_LOG("closing slot %d\n", slot_num);
1059         close_writers(s);
1060         _close_filters(s);
1061         close_receiver(slot_num);
1062         clear_slot(slot_num);
1063         return true;
1064 }
1065
1066 /*
1067  * Check if any receivers/filters/writers need to be started and do so if
1068  * necessary.
1069  */
1070 static void start_stop_decoders(struct sched *s)
1071 {
1072         int i, ret;
1073         struct slot_info *sl;
1074         struct audio_format_info *a;
1075
1076         FOR_EACH_SLOT(i)
1077                 if (try_to_close_slot(i))
1078                         sched_min_delay(s);
1079 //      if (audiod_status != AUDIOD_ON ||
1080 //                      !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1081 //              return kill_all_decoders(-E_NOT_PLAYING);
1082         ret = open_current_receiver(s);
1083         if (ret < 0)
1084                 return;
1085         sl = slot + ret;
1086         a = afi + sl->format;
1087         if (a->num_filters)
1088                 open_filters(sl);
1089         open_writers(sl);
1090         activate_grab_clients();
1091         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1092         sched_min_delay(s);
1093 }
1094
1095 /* restart the client task if necessary */
1096 static void status_pre_select(struct sched *s, struct task *t)
1097 {
1098         struct status_task *st = container_of(t, struct status_task, task);
1099
1100         if (audiod_status == AUDIOD_OFF) {
1101                 if (!st->ct)
1102                         goto out;
1103                 if (st->ct->task.error >= 0) {
1104                         st->ct->task.error = -E_AUDIOD_OFF;
1105                         goto out;
1106                 }
1107                 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1108                         goto out;
1109                 close_stat_pipe();
1110                 st->clock_diff_count = conf.clock_diff_count_arg;
1111                 goto out;
1112         }
1113         if (st->ct) {
1114                 int ret;
1115                 if (st->ct->task.error < 0) {
1116                         if (st->ct->task.error != -E_TASK_UNREGISTERED)
1117                                 goto out;
1118                         close_stat_pipe();
1119                         goto out;
1120                 }
1121                 if (st->ct->status != CL_RECEIVING)
1122                         goto out;
1123                 ret = for_each_stat_item(st->ct->buf, st->ct->loaded,
1124                         update_item);
1125                 if (ret < 0) {
1126                         st->ct->task.error = ret;
1127                         goto out;
1128                 }
1129                 if (st->ct->loaded != ret) {
1130                         st->last_status_read = *now;
1131                         st->ct->loaded = ret;
1132                 } else {
1133                         struct timeval diff;
1134                         tv_diff(now, &st->last_status_read, &diff);
1135                         if (diff.tv_sec > 61)
1136                                 st->ct->task.error = -E_STATUS_TIMEOUT;
1137                 }
1138                 goto out;
1139         }
1140         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1141                 goto out;
1142         if (st->clock_diff_count) { /* get status only one time */
1143                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1144                 int argc = 5;
1145                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1146                 st->clock_diff_count--;
1147                 client_open(argc, argv, &st->ct, NULL);
1148                 set_stat_task_restart_barrier(2);
1149                 sched_min_delay(s);
1150
1151         } else {
1152                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1153                 int argc = 4;
1154                 client_open(argc, argv, &st->ct, NULL);
1155                 set_stat_task_restart_barrier(5);
1156                 sched_min_delay(s);
1157         }
1158         free(stat_item_values[SI_BASENAME]);
1159         stat_item_values[SI_BASENAME] = para_strdup(
1160                 "no connection to para_server");
1161         stat_client_write_item(SI_BASENAME);
1162         st->last_status_read = *now;
1163 out:
1164         start_stop_decoders(s);
1165 }
1166
1167 static void init_status_task(struct status_task *st)
1168 {
1169         memset(st, 0, sizeof(struct status_task));
1170         st->task.pre_select = status_pre_select;
1171         st->sa_time_diff_sign = 1;
1172         st->clock_diff_count = conf.clock_diff_count_arg;
1173         st->current_audio_format_num = -1;
1174         sprintf(st->task.status, "status task");
1175 }
1176
1177 static void set_initial_status(void)
1178 {
1179         audiod_status = AUDIOD_ON;
1180         if (!conf.mode_given)
1181                 return;
1182         if (!strcmp(conf.mode_arg, "sb")) {
1183                 audiod_status = AUDIOD_STANDBY;
1184                 return;
1185         }
1186         if (!strcmp(conf.mode_arg, "off")) {
1187                 audiod_status = AUDIOD_OFF;
1188                 return;
1189         }
1190         if (strcmp(conf.mode_arg, "on"))
1191                 PARA_WARNING_LOG("invalid mode\n");
1192 }
1193
1194 __noreturn static void print_help_and_die(void)
1195 {
1196         int d = conf.detailed_help_given;
1197         const char **p = d? audiod_args_info_detailed_help
1198                 : audiod_args_info_help;
1199
1200         printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1201                 AUDIOD_CMDLINE_PARSER_VERSION);
1202         printf_or_die("%s\n\n", audiod_args_info_usage);
1203         for (; *p; p++)
1204                 printf_or_die("%s\n", *p);
1205         print_receiver_helps(d);
1206         print_filter_helps(d);
1207         print_writer_helps(d);
1208         exit(0);
1209 }
1210
1211 static void init_colors_or_die(void)
1212 {
1213         int ret, i;
1214
1215         if (!want_colors())
1216                 return;
1217         daemon_set_default_log_colors();
1218         daemon_set_flag(DF_COLOR_LOG);
1219         for (i = 0; i < conf.log_color_given; i++) {
1220                 ret = daemon_set_log_color(conf.log_color_arg[i]);
1221                 if (ret < 0)
1222                         exit(EXIT_FAILURE);
1223         }
1224 }
1225
1226 /**
1227  * the main function of para_audiod
1228  *
1229  * \param argc usual argument count
1230  * \param argv usual argument vector
1231  *
1232  * \return EXIT_SUCCESS or EXIT_FAILURE
1233  *
1234  * \sa para_audiod(1)
1235  * */
1236 int main(int argc, char *argv[])
1237 {
1238         int ret, i;
1239         static struct sched s;
1240         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1241         struct audiod_cmdline_parser_params params = {
1242                 .override = 0,
1243                 .initialize = 1,
1244                 .check_required = 0,
1245                 .check_ambiguity = 0,
1246                 .print_errors = 1
1247         };
1248
1249         valid_fd_012();
1250         if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1251                 exit(EXIT_FAILURE);
1252         HANDLE_VERSION_FLAG("audiod", conf);
1253         /* init receivers/filters/writers early to make help work */
1254         recv_init();
1255         filter_init();
1256         writer_init();
1257         if (conf.help_given || conf.detailed_help_given)
1258                 print_help_and_die();
1259         drop_privileges_or_die(conf.user_arg, conf.group_arg);
1260         parse_config_or_die();
1261         init_colors_or_die();
1262         init_random_seed_or_die();
1263         daemon_set_flag(DF_LOG_TIME);
1264         daemon_set_flag(DF_LOG_HOSTNAME);
1265         daemon_set_flag(DF_LOG_LL);
1266         if (conf.log_timing_given)
1267                 daemon_set_flag(DF_LOG_TIMING);
1268         if (conf.logfile_given) {
1269                 daemon_set_logfile(conf.logfile_arg);
1270                 daemon_open_log_or_die();
1271         }
1272         ret = parse_stream_args();
1273         if (ret < 0) {
1274                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1275                 exit(EXIT_FAILURE);
1276         }
1277         log_welcome("para_audiod");
1278         server_uptime(UPTIME_SET);
1279         set_initial_status();
1280         FOR_EACH_SLOT(i)
1281                 clear_slot(i);
1282         setup_signal_handling();
1283         signal_setup_default(sig_task);
1284
1285         init_status_task(stat_task);
1286         init_command_task(cmd_task);
1287
1288         if (conf.daemon_given)
1289                 daemonize();
1290
1291         register_task(&sig_task->task);
1292         register_task(&cmd_task->task);
1293         register_task(&stat_task->task);
1294         s.default_timeout.tv_sec = 2;
1295         s.default_timeout.tv_usec = 999 * 1000;
1296         ret = schedule(&s);
1297
1298         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1299         return EXIT_FAILURE;
1300 }