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 /* returns slot num on success. */
 545 static int open_current_receiver(struct sched *s)
 546 {
 547         struct timeval diff;
 548         int ret, cafn = stat_task->current_audio_format_num;
 549
 550         if (cafn < 0 || !stat_task->ct)
 551                 return -1;
 552         /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
 553         if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
 554                 return -1;
 555         ret = receiver_running(cafn);
 556         if (ret > 0) /* already running and not eof */
 557                 return -1;
 558         if (ret < 0) { /* eof */
 559                 /*
 560                  * para_server uses a zero start time during the announcement
 561                  * period, i.e. before it sends the first chunk. Wait until
 562                  * this period begins to avoid restarting the receiver that
 563                  * belongs to the file just completed.
 564                  */
 565                 if (stat_task->server_stream_start.tv_sec != 0)
 566                         return -1;
 567         }
 568         if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
 569                 /* avoid busy loop */
 570                 s->timeout = diff;
 571                 return -1;
 572         }
 573         /* start a new receiver */
 574         return open_receiver(cafn);
 575 }
 576
 577 static unsigned compute_time_diff(const struct timeval *status_time)
 578 {
 579         struct timeval tmp, diff;
 580         static unsigned count;
 581         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 582         const struct timeval max_deviation = {0, 500 * 1000};
 583         const int time_smooth = 5;
 584
 585         if (!status_time)
 586                 return count;
 587         sign = tv_diff(status_time, now, &diff);
 588 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 589 //                      sign, sa_time_diff_sign);
 590         if (!count) {
 591                 sa_time_diff_sign = sign;
 592                 stat_task->sa_time_diff = diff;
 593                 count++;
 594                 goto out;
 595         }
 596         if (count > 5) {
 597                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 598                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 599                         PARA_WARNING_LOG("time diff jump: %lims\n",
 600                                 s * tv2ms(&tmp));
 601         }
 602         count++;
 603         sa_time_diff_sign = tv_convex_combination(
 604                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 605                 count > 10? sign : sign * time_smooth, &diff,
 606                 &tmp);
 607         stat_task->sa_time_diff = tmp;
 608         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 609                 sign > 0? "+" : "-",
 610                 tv2ms(&diff),
 611                 sa_time_diff_sign ? "+" : "-",
 612                 tv2ms(&stat_task->sa_time_diff)
 613         );
 614 out:
 615         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 616         return count;
 617 }
 618
 619 static int update_item(int itemnum, char *buf)
 620 {
 621         long unsigned sec, usec;
 622
 623         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 624                 return 1;
 625         free(stat_item_values[itemnum]);
 626         stat_item_values[itemnum] = para_strdup(buf);
 627         stat_client_write_item(itemnum);
 628         switch (itemnum) {
 629         case SI_STATUS_FLAGS:
 630                 stat_task->vss_status = 0;
 631                 if (strchr(buf, 'N'))
 632                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
 633                 if (strchr(buf, 'P'))
 634                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
 635                 break;
 636         case SI_OFFSET:
 637                 stat_task->offset_seconds = atoi(buf);
 638                 break;
 639         case SI_SECONDS_TOTAL:
 640                 stat_task->length_seconds = atoi(buf);
 641                 break;
 642         case SI_STREAM_START:
 643                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 644                         struct timeval a_start, delay;
 645                         delay.tv_sec = conf.stream_delay_arg / 1000;
 646                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 647                         stat_task->server_stream_start.tv_sec = sec;
 648                         stat_task->server_stream_start.tv_usec = usec;
 649                         if (compute_time_diff(NULL) > 2) {
 650                                 if (stat_task->sa_time_diff_sign < 0)
 651                                         tv_add(&stat_task->server_stream_start,
 652                                                 &stat_task->sa_time_diff, &a_start);
 653                                 else
 654                                         tv_diff(&stat_task->server_stream_start,
 655                                                 &stat_task->sa_time_diff, &a_start);
 656                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 657                         }
 658                 }
 659                 break;
 660         case SI_CURRENT_TIME:
 661                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
 662                         struct timeval tv = {sec, usec};
 663                         compute_time_diff(&tv);
 664                 }
 665                 break;
 666         case SI_FORMAT:
 667                 stat_task->current_audio_format_num
 668                         = get_audio_format_num(buf);
 669         }
 670         return 1;
 671 }
 672
 673 static int parse_stream_command(const char *txt, char **cmd)
 674 {
 675         char *p = strchr(txt, ':');
 676         int i;
 677
 678         if (!p)
 679                 return -E_MISSING_COLON;
 680         p++;
 681         FOR_EACH_AUDIO_FORMAT(i) {
 682                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 683                         continue;
 684                 *cmd = p;
 685                 return i;
 686         }
 687         return -E_UNSUPPORTED_AUDIO_FORMAT;
 688 }
 689
 690 static int add_filter(int format, char *cmdline)
 691 {
 692         struct audio_format_info *a = &afi[format];
 693         int filter_num, nf = a->num_filters;
 694
 695         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 696         if (filter_num < 0)
 697                 return filter_num;
 698         a->filter_nums[nf] = filter_num;
 699         a->num_filters++;
 700         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 701                 filters[filter_num].name);
 702         return filter_num;
 703 }
 704
 705 static int parse_writer_args(void)
 706 {
 707         int i, ret, nw;
 708         char *cmd;
 709         struct audio_format_info *a;
 710
 711         nw = PARA_MAX(1U, conf.writer_given);
 712         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 713         FOR_EACH_AUDIO_FORMAT(i) {
 714                 a = &afi[i];
 715                 a->writer_conf = para_malloc(nw * sizeof(void *));
 716                 a->writer_nums = para_malloc(nw * sizeof(int));
 717                 a->num_writers = 0;
 718         }
 719         for (i = 0; i < conf.writer_given; i++) {
 720                 void *wconf;
 721                 int writer_num;
 722                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 723                 if (ret < 0)
 724                         goto out;
 725                 a = &afi[ret];
 726                 nw = a->num_writers;
 727                 wconf = check_writer_arg(cmd, &writer_num);
 728                 if (!wconf) {
 729                         ret = writer_num;
 730                         goto out;
 731                 }
 732                 a->writer_nums[nw] = writer_num;
 733                 a->writer_conf[nw] = wconf;
 734                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 735                         nw, writer_names[writer_num]);
 736                 a->num_writers++;
 737         }
 738         ret = 1;
 739 out:
 740         return ret;
 741 }
 742
 743 static int parse_receiver_args(void)
 744 {
 745         int i, ret, receiver_num;
 746         char *cmd = NULL;
 747         struct audio_format_info *a;
 748
 749         for (i = conf.receiver_given - 1; i >= 0; i--) {
 750                 char *arg = conf.receiver_arg[i];
 751                 char *recv_arg = strchr(arg, ':');
 752                 ret = -E_MISSING_COLON;
 753                 if (!recv_arg)
 754                         goto out;
 755                 *recv_arg = '\0';
 756                 recv_arg++;
 757                 ret = get_audio_format_num(arg);
 758                 if (ret < 0)
 759                         goto out;
 760                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 761                 if (!afi[ret].receiver_conf) {
 762                         ret = -E_RECV_SYNTAX;
 763                         goto out;
 764                 }
 765                 afi[ret].receiver = &receivers[receiver_num];
 766         }
 767         /* use the first available receiver with no arguments
 768          * for those audio formats for which no receiver
 769          * was specified
 770          */
 771         cmd = para_strdup(receivers[0].name);
 772         FOR_EACH_AUDIO_FORMAT(i) {
 773                 a = &afi[i];
 774                 if (a->receiver_conf)
 775                         continue;
 776                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 777                 if (!a->receiver_conf)
 778                         return -E_RECV_SYNTAX;
 779                 a->receiver = &receivers[receiver_num];
 780         }
 781         ret = 1;
 782 out:
 783         free(cmd);
 784         return ret;
 785 }
 786
 787 static int init_default_filters(void)
 788 {
 789         int i, ret = 1;
 790
 791         FOR_EACH_AUDIO_FORMAT(i) {
 792                 struct audio_format_info *a = &afi[i];
 793                 char *tmp;
 794                 int j;
 795
 796                 if (a->num_filters)
 797                         continue; /* no default -- nothing to to */
 798                 /* add "dec" to audio format name */
 799                 tmp = make_message("%sdec", audio_formats[i]);
 800                 for (j = 0; filters[j].name; j++)
 801                         if (!strcmp(tmp, filters[j].name))
 802                                 break;
 803                 free(tmp);
 804                 ret = -E_UNSUPPORTED_FILTER;
 805                 if (!filters[j].name)
 806                         goto out;
 807                 tmp = para_strdup(filters[j].name);
 808                 ret = add_filter(i, tmp);
 809                 free(tmp);
 810                 if (ret < 0)
 811                         goto out;
 812                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 813                         filters[j].name);
 814         }
 815 out:
 816         return ret;
 817 }
 818
 819 static int parse_filter_args(void)
 820 {
 821         int i, ret, nf;
 822
 823         nf = PARA_MAX(1U, conf.filter_given);
 824         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 825         FOR_EACH_AUDIO_FORMAT(i) {
 826                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 827                 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
 828         }
 829         if (!conf.no_default_filters_given)
 830                 return init_default_filters();
 831         for (i = 0; i < conf.filter_given; i++) {
 832                 char *arg = conf.filter_arg[i];
 833                 char *filter_name = strchr(arg, ':');
 834                 ret = -E_MISSING_COLON;
 835                 if (!filter_name)
 836                         goto out;
 837                 *filter_name = '\0';
 838                 filter_name++;
 839                 ret = get_audio_format_num(arg);
 840                 if (ret < 0)
 841                         goto out;
 842                 ret = add_filter(ret, filter_name);
 843                 if (ret < 0)
 844                         goto out;
 845         }
 846         ret = init_default_filters(); /* use default values for the rest */
 847 out:
 848         return ret;
 849 }
 850
 851 static int parse_stream_args(void)
 852 {
 853         int ret;
 854
 855         ret = parse_receiver_args();
 856         if (ret < 0)
 857                 return ret;
 858         ret = parse_filter_args();
 859         if (ret < 0)
 860                 return ret;
 861         ret = parse_writer_args();
 862         if (ret < 0)
 863                 return ret;
 864         return 1;
 865 }
 866
 867 /* does not unlink socket on errors */
 868 static int audiod_get_socket(void)
 869 {
 870         struct sockaddr_un unix_addr;
 871         int ret, fd;
 872
 873         if (conf.socket_given)
 874                 socket_name = para_strdup(conf.socket_arg);
 875         else {
 876                 char *hn = para_hostname();
 877                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 878                         hn);
 879                 free(hn);
 880         }
 881         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 882         if (conf.force_given)
 883                 unlink(socket_name);
 884         ret = create_local_socket(socket_name, &unix_addr,
 885                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 886         if (ret < 0)
 887                 goto err;
 888         fd = ret;
 889         if (listen(fd , 5) < 0) {
 890                 ret = -ERRNO_TO_PARA_ERROR(errno);
 891                 goto err;
 892         }
 893         ret = mark_fd_nonblocking(fd);
 894         if (ret < 0)
 895                 goto err;
 896         return fd;
 897 err:
 898         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 899         exit(EXIT_FAILURE);
 900 }
 901
 902 static void signal_pre_select(struct sched *s, struct task *t)
 903 {
 904         struct signal_task *st = container_of(t, struct signal_task, task);
 905         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 906 }
 907
 908 static void signal_post_select(struct sched *s, struct task *t)
 909 {
 910         struct signal_task *st = container_of(t, struct signal_task, task);
 911
 912         if (!FD_ISSET(st->fd, &s->rfds))
 913                 return;
 914
 915         st->signum = para_next_signal();
 916         switch (st->signum) {
 917         case SIGINT:
 918         case SIGTERM:
 919         case SIGHUP:
 920                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 921                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 922         }
 923 }
 924
 925 static void signal_setup_default(struct signal_task *st)
 926 {
 927         st->task.pre_select = signal_pre_select;
 928         st->task.post_select = signal_post_select;
 929         sprintf(st->task.status, "signal task");
 930 }
 931
 932 static void command_pre_select(struct sched *s, struct task *t)
 933 {
 934         struct command_task *ct = container_of(t, struct command_task, task);
 935         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 936 }
 937
 938 static void command_post_select(struct sched *s, struct task *t)
 939 {
 940         int ret;
 941         struct command_task *ct = container_of(t, struct command_task, task);
 942         static struct timeval last_status_dump;
 943         struct timeval tmp, delay = {0, 500 * 1000};
 944
 945         tv_add(&last_status_dump, &delay, &tmp);
 946         if (tv_diff(&tmp, now, NULL) < 0) {
 947                 audiod_status_dump();
 948                 last_status_dump = *now;
 949         }
 950
 951         if (!FD_ISSET(ct->fd, &s->rfds))
 952                 return;
 953         ret = handle_connect(ct->fd);
 954         if (ret < 0)
 955                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 956 }
 957
 958 static void init_command_task(struct command_task *ct)
 959 {
 960         ct->task.pre_select = command_pre_select;
 961         ct->task.post_select = command_post_select;
 962         ct->task.error = 0;
 963         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 964         sprintf(ct->task.status, "command task");
 965 }
 966
 967 static void close_stat_pipe(void)
 968 {
 969         if (!stat_task->ct)
 970                 return;
 971         client_close(stat_task->ct);
 972         stat_task->ct = NULL;
 973         clear_and_dump_items();
 974         stat_task->length_seconds = 0;
 975         stat_task->offset_seconds = 0;
 976         stat_task->vss_status = 0;
 977         stat_task->current_audio_format_num = -1;
 978         audiod_status_dump();
 979 }
 980
 981 /**
 982  * close the connection to para_server and exit
 983  *
 984  * \param status the exit status which is passed to exit(3)
 985  * \param msg the log message
 986  *
 987  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
 988  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
 989  * EXIT_FAILURE.
 990  *
 991  * \sa exit(3)
 992  */
 993 void __noreturn clean_exit(int status, const char *msg)
 994 {
 995         PARA_EMERG_LOG("%s\n", msg);
 996         if (socket_name)
 997                 unlink(socket_name);
 998         close_stat_pipe();
 999         exit(status);
1000 }
1001
1002 /* avoid busy loop if server is down */
1003 static void set_stat_task_restart_barrier(unsigned seconds)
1004 {
1005         struct timeval delay = {seconds, 0};
1006         tv_add(now, &delay, &stat_task->restart_barrier);
1007 }
1008
1009 static void try_to_close_slot(int slot_num)
1010 {
1011         struct slot_info *s = &slot[slot_num];
1012         struct audio_format_info *a = afi + s->format;
1013         int i;
1014
1015         if (s->format < 0)
1016                 return;
1017         if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1018                 return;
1019         for (i = 0; i < a->num_filters; i++)
1020                 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1021                         return;
1022         for (i = 0; i < a->num_writers; i++)
1023                 if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1024                         return;
1025         PARA_INFO_LOG("closing slot %d\n", slot_num);
1026         close_writers(s);
1027         _close_filters(s);
1028         close_receiver(slot_num);
1029         clear_slot(slot_num);
1030 }
1031
1032 /*
1033  * Check if any receivers/filters/writers need to be started and do so if
1034  * necessary.
1035  */
1036 static void start_stop_decoders(struct sched *s)
1037 {
1038         int i, ret;
1039         struct slot_info *sl;
1040         struct audio_format_info *a;
1041
1042         FOR_EACH_SLOT(i)
1043                 try_to_close_slot(i);
1044 //      if (audiod_status != AUDIOD_ON ||
1045 //                      !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1046 //              return kill_all_decoders(-E_NOT_PLAYING);
1047         ret = open_current_receiver(s);
1048         if (ret < 0)
1049                 return;
1050         sl = slot + ret;
1051         a = afi + sl->format;
1052         if (a->num_filters)
1053                 open_filters(sl);
1054         open_writers(sl);
1055         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1056         s->timeout.tv_sec = 0;
1057         s->timeout.tv_usec = 1;
1058 }
1059
1060 /* restart the client task if necessary */
1061 static void status_pre_select(struct sched *s, struct task *t)
1062 {
1063         struct status_task *st = container_of(t, struct status_task, task);
1064
1065         if (audiod_status == AUDIOD_OFF) {
1066                 if (!st->ct)
1067                         goto out;
1068                 if (st->ct->task.error >= 0) {
1069                         st->ct->task.error = -E_AUDIOD_OFF;
1070                         goto out;
1071                 }
1072                 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1073                         goto out;
1074                 close_stat_pipe();
1075                 st->clock_diff_count = conf.clock_diff_count_arg;
1076                 goto out;
1077         }
1078         if (st->ct) {
1079                 int ret;
1080                 if (st->ct->task.error < 0) {
1081                         if (st->ct->task.error != -E_TASK_UNREGISTERED)
1082                                 goto out;
1083                         close_stat_pipe();
1084                         goto out;
1085                 }
1086                 if (st->ct->status != CL_RECEIVING)
1087                         goto out;
1088                 ret = for_each_stat_item(st->ct->buf, st->ct->loaded,
1089                         update_item);
1090                 if (ret < 0) {
1091                         st->ct->task.error = ret;
1092                         goto out;
1093                 }
1094                 if (st->ct->loaded != ret) {
1095                         st->last_status_read = *now;
1096                         st->ct->loaded = ret;
1097                 } else {
1098                         struct timeval diff;
1099                         tv_diff(now, &st->last_status_read, &diff);
1100                         if (diff.tv_sec > 61)
1101                                 st->ct->task.error = -E_STATUS_TIMEOUT;
1102                 }
1103                 goto out;
1104         }
1105         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1106                 goto out;
1107         if (st->clock_diff_count) { /* get status only one time */
1108                 char *argv[] = {"audiod", "--", "stat", "-p", "1", NULL};
1109                 int argc = 5;
1110                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1111                 st->clock_diff_count--;
1112                 client_open(argc, argv, &st->ct, NULL);
1113                 set_stat_task_restart_barrier(2);
1114
1115         } else {
1116                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1117                 int argc = 4;
1118                 client_open(argc, argv, &st->ct, NULL);
1119                 set_stat_task_restart_barrier(5);
1120         }
1121         free(stat_item_values[SI_BASENAME]);
1122         stat_item_values[SI_BASENAME] = para_strdup(
1123                 "no connection to para_server");
1124         stat_client_write_item(SI_BASENAME);
1125         st->last_status_read = *now;
1126 out:
1127         start_stop_decoders(s);
1128 }
1129
1130 static void init_status_task(struct status_task *st)
1131 {
1132         memset(st, 0, sizeof(struct status_task));
1133         st->task.pre_select = status_pre_select;
1134         st->sa_time_diff_sign = 1;
1135         st->clock_diff_count = conf.clock_diff_count_arg;
1136         st->current_audio_format_num = -1;
1137         sprintf(st->task.status, "status task");
1138 }
1139
1140 static void set_initial_status(void)
1141 {
1142         audiod_status = AUDIOD_ON;
1143         if (!conf.mode_given)
1144                 return;
1145         if (!strcmp(conf.mode_arg, "sb")) {
1146                 audiod_status = AUDIOD_STANDBY;
1147                 return;
1148         }
1149         if (!strcmp(conf.mode_arg, "off")) {
1150                 audiod_status = AUDIOD_OFF;
1151                 return;
1152         }
1153         if (strcmp(conf.mode_arg, "on"))
1154                 PARA_WARNING_LOG("invalid mode\n");
1155 }
1156
1157 __noreturn static void print_help_and_die(void)
1158 {
1159         int d = conf.detailed_help_given;
1160         const char **p = d? audiod_args_info_detailed_help
1161                 : audiod_args_info_help;
1162
1163         printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1164                 AUDIOD_CMDLINE_PARSER_VERSION);
1165         printf_or_die("%s\n\n", audiod_args_info_usage);
1166         for (; *p; p++)
1167                 printf_or_die("%s\n", *p);
1168         print_receiver_helps(d);
1169         print_filter_helps(d);
1170         print_writer_helps(d);
1171         exit(0);
1172 }
1173
1174 static void init_colors_or_die(void)
1175 {
1176         int ret, i;
1177
1178         if (!want_colors())
1179                 return;
1180         daemon_set_default_log_colors();
1181         daemon_set_flag(DF_COLOR_LOG);
1182         for (i = 0; i < conf.log_color_given; i++) {
1183                 ret = daemon_set_log_color(conf.log_color_arg[i]);
1184                 if (ret < 0)
1185                         exit(EXIT_FAILURE);
1186         }
1187 }
1188
1189 /**
1190  * the main function of para_audiod
1191  *
1192  * \param argc usual argument count
1193  * \param argv usual argument vector
1194  *
1195  * \return EXIT_SUCCESS or EXIT_FAILURE
1196  *
1197  * \sa para_audiod(1)
1198  * */
1199 int main(int argc, char *argv[])
1200 {
1201         int ret, i;
1202         static struct sched s;
1203         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1204         struct audiod_cmdline_parser_params params = {
1205                 .override = 0,
1206                 .initialize = 1,
1207                 .check_required = 0,
1208                 .check_ambiguity = 0,
1209                 .print_errors = 1
1210         };
1211
1212         valid_fd_012();
1213         if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1214                 exit(EXIT_FAILURE);
1215         HANDLE_VERSION_FLAG("audiod", conf);
1216         /* init receivers/filters/writers early to make help work */
1217         recv_init();
1218         filter_init();
1219         writer_init();
1220         if (conf.help_given || conf.detailed_help_given)
1221                 print_help_and_die();
1222         drop_privileges_or_die(conf.user_arg, conf.group_arg);
1223         parse_config_or_die();
1224         init_colors_or_die();
1225         init_random_seed_or_die();
1226         daemon_set_flag(DF_LOG_TIME);
1227         daemon_set_flag(DF_LOG_HOSTNAME);
1228         daemon_set_flag(DF_LOG_LL);
1229         if (conf.log_timing_given)
1230                 daemon_set_flag(DF_LOG_TIMING);
1231         if (conf.logfile_given) {
1232                 daemon_set_logfile(conf.logfile_arg);
1233                 daemon_open_log_or_die();
1234         }
1235         ret = parse_stream_args();
1236         if (ret < 0) {
1237                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1238                 exit(EXIT_FAILURE);
1239         }
1240         log_welcome("para_audiod");
1241         server_uptime(UPTIME_SET);
1242         set_initial_status();
1243         FOR_EACH_SLOT(i)
1244                 clear_slot(i);
1245         init_grabbing();
1246         setup_signal_handling();
1247         signal_setup_default(sig_task);
1248
1249         init_status_task(stat_task);
1250         init_command_task(cmd_task);
1251
1252         if (conf.daemon_given)
1253                 daemonize();
1254
1255         register_task(&sig_task->task);
1256         register_task(&cmd_task->task);
1257         register_task(&stat_task->task);
1258         s.default_timeout.tv_sec = 2;
1259         s.default_timeout.tv_usec = 999 * 1000;
1260         ret = schedule(&s);
1261
1262         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1263         return EXIT_FAILURE;
1264 }