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