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