audiod.c

   1 /*
   2  * Copyright (C) 2005-2008 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 <sys/types.h>
   9 #include <dirent.h>
  10 #include <signal.h>
  11
  12 #include "para.h"
  13 #include "error.h"
  14 #include "audiod.cmdline.h"
  15 #include "list.h"
  16 #include "sched.h"
  17 #include "recv.h"
  18 #include "filter.h"
  19 #include "grab_client.cmdline.h"
  20 #include "grab_client.h"
  21 #include "client.cmdline.h"
  22 #include "client.h"
  23 #include "audiod.h"
  24 #include "net.h"
  25 #include "daemon.h"
  26 #include "string.h"
  27 #include "fd.h"
  28 #include "write.h"
  29 #include "write_common.h"
  30 #include "signal.h"
  31
  32 /** define the array of error lists needed by para_audiod */
  33 INIT_AUDIOD_ERRLISTS;
  34 /** define the array containing all supported audio formats */
  35 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
  36
  37 /** Defines how audiod handles one supported audio format. */
  38 struct audio_format_info {
  39         /** pointer to the receiver for this audio format */
  40         struct receiver *receiver;
  41         /** the receiver configuration */
  42         void *receiver_conf;
  43         /** the number of filters that should be activated for this audio format */
  44         unsigned int num_filters;
  45         /** Array of filter numbers to be activated. */
  46         unsigned *filter_nums;
  47         /** Pointer to the array of filter configurations. */
  48         void **filter_conf;
  49         /** the number of filters that should be activated for this audio format */
  50         unsigned int num_writers;
  51         /** pointer to the array of writers to be activated */
  52         struct writer **writers;
  53         /** pointer to the array of writer configurations */
  54         void **writer_conf;
  55         /** do not start receiver/filters/writer before this time */
  56         struct timeval restart_barrier;
  57 };
  58
  59 /**
  60  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  61  * be associated with a receiver/filter/writer triple. This array holds all
  62  * information on the status of these slots.
  63  *
  64  * \sa struct slot_info
  65  * */
  66 struct slot_info slot[MAX_STREAM_SLOTS];
  67
  68
  69 /** The array of status items sent by para_server. */
  70 char *stat_item_values[NUM_STAT_ITEMS];
  71
  72 /**
  73  * the current mode of operation of which can be changed by the on/off/cycle
  74  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
  75  */
  76 int audiod_status = AUDIOD_ON;
  77
  78 /**
  79  * the gengetopt args_info struct that holds information on all command line
  80  * arguments
  81  */
  82 struct audiod_args_info conf;
  83
  84 static char *socket_name;
  85 static FILE *logfile;
  86 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
  87
  88 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
  89
  90 static struct status_task status_task_struct;
  91
  92 /**
  93  * the task that calls the status command of para_server
  94  *
  95  * \sa struct status_task
  96  */
  97 static struct status_task *stat_task = &status_task_struct;
  98 static struct timeval initial_delay_barrier;
  99
 100 /**
 101  * the task for handling audiod commands
 102  *
 103  * \sa struct task, struct sched
 104  */
 105 struct command_task {
 106         /** the local listening socket */
 107         int fd;
 108         /** the associated task structure */
 109         struct task task;
 110 };
 111
 112 /** iterate over all supported audio formats */
 113 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 114
 115 /**
 116  * get the audio format number
 117  * \param name the name of the audio format
 118  *
 119  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 120  * \a name is not a supported audio format.
 121  */
 122 int get_audio_format_num(char *name)
 123 {
 124         int i;
 125
 126         while (para_isspace(*name))
 127                 name++;
 128         FOR_EACH_AUDIO_FORMAT(i)
 129                 if (!strcmp(name, audio_formats[i]))
 130                         return i;
 131         return -E_UNSUPPORTED_AUDIO_FORMAT;
 132 }
 133
 134 char *get_time_string(struct timeval *newest_stime)
 135 {
 136         struct timeval diff, adj_stream_start, tmp;
 137         int total = 0, use_server_time = 1,
 138                 length_seconds = stat_task->length_seconds;
 139
 140         if (!stat_task->playing) {
 141                 if (length_seconds)
 142                         return NULL;
 143                 return make_message("%s:\n", status_item_list[SI_PLAY_TIME]);
 144         }
 145         if (audiod_status == AUDIOD_OFF)
 146                 goto out;
 147         if (stat_task->sa_time_diff_sign > 0)
 148                 tv_diff(&stat_task->server_stream_start, &stat_task->sa_time_diff,
 149                         &adj_stream_start);
 150         else
 151                 tv_add(&stat_task->server_stream_start, &stat_task->sa_time_diff,
 152                         &adj_stream_start);
 153         tmp = adj_stream_start;
 154         if (newest_stime && audiod_status == AUDIOD_ON) {
 155                 tv_diff(newest_stime, &adj_stream_start, &diff);
 156                 if (tv2ms(&diff) < 5000) {
 157                         tmp = *newest_stime;
 158                         use_server_time = 0;
 159                 }
 160         }
 161         tv_diff(now, &tmp, &diff);
 162         total = diff.tv_sec + stat_task->offset_seconds;
 163         if (total > length_seconds)
 164                 total = length_seconds;
 165         if (total < 0)
 166                 total = 0;
 167 out:
 168         return make_message(
 169                 "%s: %s%d:%02d [%d:%02d] (%d%%/%d:%02d)\n",
 170                 status_item_list[SI_PLAY_TIME],
 171                 use_server_time? "~" : "",
 172                 total / 60,
 173                 total % 60,
 174                 (length_seconds - total) / 60,
 175                 (length_seconds - total) % 60,
 176                 length_seconds? (total * 100 + length_seconds / 2) /
 177                         length_seconds : 0,
 178                 length_seconds / 60,
 179                 length_seconds % 60
 180         );
 181 }
 182
 183 /**
 184  * the log function of para_audiod
 185  *
 186  * \param ll loglevel
 187  * \param fmt the format string
 188  */
 189 void para_log(int ll, const char* fmt,...)
 190 {
 191         va_list argp;
 192         FILE *outfd;
 193         struct tm *tm;
 194         time_t t1;
 195         char str[MAXLINE] = "";
 196         static char *hostname;
 197
 198         if (ll < conf.loglevel_arg)
 199                 return;
 200         if (!logfile && conf.daemon_given)
 201                 return;
 202         if (!hostname)
 203                 hostname = para_hostname();
 204         outfd = logfile? logfile : stderr;
 205         time(&t1);
 206         tm = localtime(&t1);
 207         strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
 208         fprintf(outfd, "%s %s ", str, hostname);
 209         if (conf.loglevel_arg <= INFO)
 210                 fprintf(outfd, "%i ", ll);
 211         va_start(argp, fmt);
 212         vfprintf(outfd, fmt, argp);
 213         va_end(argp);
 214 }
 215
 216 static char *configfile_exists(void)
 217 {
 218         char *home = para_homedir();
 219         char *config_file = make_message("%s/.paraslash/audiod.conf",
 220                 home);
 221         free(home);
 222         if (file_exists(config_file))
 223                 return config_file;
 224         free(config_file);
 225         return NULL;
 226 }
 227
 228 static void setup_signal_handling(void)
 229 {
 230         sig_task->fd = para_signal_init();
 231         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 232         para_install_sighandler(SIGINT);
 233         para_install_sighandler(SIGTERM);
 234         para_install_sighandler(SIGHUP);
 235         signal(SIGPIPE, SIG_IGN);
 236 }
 237
 238 static void clear_slot(int slot_num)
 239 {
 240         struct slot_info *s = &slot[slot_num];
 241
 242         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 243         memset(s, 0, sizeof(struct slot_info));
 244         s->format = -1;
 245 }
 246
 247 static void close_receiver(int slot_num)
 248 {
 249         struct slot_info *s = &slot[slot_num];
 250         struct audio_format_info *a;
 251
 252         if (s->format < 0 || !s->receiver_node)
 253                 return;
 254         a = &afi[s->format];
 255         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 256                 audio_formats[s->format], slot_num);
 257         a->receiver->close(s->receiver_node);
 258         free(s->receiver_node);
 259         s->receiver_node = NULL;
 260 }
 261
 262 static void kill_all_decoders(int error)
 263 {
 264         int i;
 265
 266         FOR_EACH_SLOT(i) {
 267                 struct slot_info *s = &slot[i];
 268                 if (s->wng && s->wng->task.error >= 0) {
 269                         PARA_INFO_LOG("deactivating wng in slot %d\n",
 270                                 i);
 271                         s->wng->task.error = error;
 272                 }
 273                 if (s->fc && s->fc->task.error >= 0) {
 274                         PARA_INFO_LOG("deactivatimg filter chain in slot %d\n", i);
 275                         s->fc->task.error = error;
 276                 }
 277                 if (s->receiver_node && s->receiver_node->task.error >= 0) {
 278                         PARA_INFO_LOG("deactivating receiver_node in slot %d\n", i);
 279                         s->receiver_node->task.error = error;
 280                 }
 281         }
 282 }
 283
 284 static int get_empty_slot(void)
 285 {
 286         int i;
 287         struct slot_info *s;
 288
 289         FOR_EACH_SLOT(i) {
 290                 s = &slot[i];
 291                 if (s->format < 0) {
 292                         clear_slot(i);
 293                         return i;
 294                 }
 295                 if (s->wng || s->receiver_node || s->fc)
 296                         continue;
 297                 clear_slot(i);
 298                 return i;
 299         }
 300         return -E_NO_MORE_SLOTS;
 301 }
 302
 303 /**
 304  * get the number of filters
 305  *
 306  * \param audio_format_num the number identifying the audio format
 307  *
 308  * \return the number of filters for the given audio format
 309  *
 310  * \sa struct filter;
 311  */
 312 int num_filters(int audio_format_num)
 313 {
 314         return afi[audio_format_num].num_filters;
 315 }
 316
 317 static void open_filters(int slot_num)
 318 {
 319         struct slot_info *s = &slot[slot_num];
 320         struct audio_format_info *a = &afi[s->format];
 321         struct filter_node *fn;
 322         int nf = a->num_filters;
 323         int i;
 324
 325         s->fc = NULL;
 326         if (!nf)
 327                 return;
 328         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 329         s->fc = para_calloc(sizeof(struct filter_chain));
 330         s->fc->filter_nodes = para_malloc(nf * sizeof(struct filter_node));
 331         s->fc->inbuf = s->receiver_node->buf;
 332         s->fc->in_loaded = &s->receiver_node->loaded;
 333         s->fc->input_error = &s->receiver_node->task.error;
 334         s->fc->task.pre_select = filter_pre_select;
 335         s->fc->task.post_select = NULL;
 336         s->fc->task.error = 0;
 337         s->fc->num_filters = nf;
 338
 339         s->receiver_node->output_error = &s->fc->task.error;
 340         sprintf(s->fc->task.status, "filter chain");
 341         FOR_EACH_FILTER_NODE(fn, s->fc, i) {
 342                 struct filter *f = filters + a->filter_nums[i];
 343                 fn->filter_num = a->filter_nums[i];
 344                 fn->conf = a->filter_conf[i];
 345                 fn->fc = s->fc;
 346                 fn->loaded = 0;
 347                 INIT_LIST_HEAD(&fn->callbacks);
 348                 f->open(fn);
 349                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 350                         audio_formats[s->format], i,  nf, f->name, slot_num);
 351                 s->fc->outbuf = fn->buf;
 352                 s->fc->out_loaded = &fn->loaded;
 353         }
 354         register_task(&s->fc->task);
 355 }
 356
 357 static void open_writers(int slot_num)
 358 {
 359         int ret, i;
 360         struct slot_info *s = &slot[slot_num];
 361         struct audio_format_info *a = &afi[s->format];
 362
 363         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 364         if (!a->num_writers)
 365                 s->wng = setup_default_wng();
 366         else
 367                 s->wng = wng_new(a->num_writers);
 368         if (s->fc) {
 369                 s->wng->buf = s->fc->outbuf;
 370                 s->wng->loaded = s->fc->out_loaded;
 371                 s->wng->input_error = &s->fc->task.error;
 372                 s->wng->channels = &s->fc->channels;
 373                 s->wng->samplerate = &s->fc->samplerate;
 374                 s->fc->output_error = &s->wng->task.error;
 375                 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
 376         } else {
 377                 s->wng->buf = s->receiver_node->buf;
 378                 s->wng->loaded = &s->receiver_node->loaded;
 379                 s->wng->input_error = &s->receiver_node->task.error;
 380         }
 381         for (i = 0; i < a->num_writers; i++) {
 382                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 383                 s->wng->writer_nodes[i].writer = a->writers[i];
 384         }
 385         ret = wng_open(s->wng);
 386         if (ret < 0) {
 387                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 388                 return;
 389         }
 390         s->wstime = *now;
 391         activate_inactive_grab_clients(slot_num, s->format, s->fc);
 392 }
 393
 394 static int open_receiver(int format)
 395 {
 396         struct audio_format_info *a = &afi[format];
 397         struct slot_info *s;
 398         int ret, slot_num;
 399         struct receiver_node *rn;
 400         const struct timeval restart_delay = {2, 0};
 401
 402         ret = get_empty_slot();
 403         if (ret < 0)
 404                 goto err;
 405         slot_num = ret;
 406         s = &slot[slot_num];
 407         s->format = format;
 408         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 409         rn = s->receiver_node;
 410         rn->receiver = a->receiver;
 411         rn->conf = a->receiver_conf;
 412         ret = a->receiver->open(s->receiver_node);
 413         if (ret < 0) {
 414                 free(s->receiver_node);
 415                 s->receiver_node = NULL;
 416                 goto err;
 417         }
 418         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 419                 audio_formats[s->format], a->receiver->name, slot_num);
 420         rn->task.pre_select = a->receiver->pre_select;
 421         rn->task.post_select = a->receiver->post_select;
 422         sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
 423         register_task(&rn->task);
 424         ret = 1;
 425 err:
 426         if (ret < 0)
 427                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 428         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 429         return ret;
 430 }
 431
 432 static int receiver_running(int format)
 433 {
 434         int i;
 435
 436         FOR_EACH_SLOT(i) {
 437                 struct slot_info *s = &slot[i];
 438                 if (s->format == format && s->receiver_node)
 439                         return 1;
 440         }
 441         return 0;
 442 }
 443
 444 static int open_current_receiver(struct sched *s)
 445 {
 446         struct timeval diff;
 447         int cafn = stat_task->current_audio_format_num;
 448
 449         if (cafn < 0 || !stat_task->ct)
 450                 return 0;
 451         if (receiver_running(cafn))
 452                 return 0;
 453         if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
 454                 s->timeout = diff;
 455                 return 0;
 456         }
 457         return open_receiver(cafn) < 0? 0 : 1;
 458 }
 459
 460 static unsigned compute_time_diff(const struct timeval *status_time)
 461 {
 462         struct timeval tmp, diff;
 463         static unsigned count;
 464         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 465         const struct timeval max_deviation = {0, 500 * 1000};
 466         const int time_smooth = 5;
 467
 468         if (!status_time)
 469                 return count;
 470         sign = tv_diff(status_time, now, &diff);
 471 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 472 //                      sign, sa_time_diff_sign);
 473         if (!count) {
 474                 sa_time_diff_sign = sign;
 475                 stat_task->sa_time_diff = diff;
 476                 count++;
 477                 goto out;
 478         }
 479         if (count > 5) {
 480                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 481                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 482                         PARA_WARNING_LOG("time diff jump: %lims\n",
 483                                 s * tv2ms(&tmp));
 484         }
 485         count++;
 486         sa_time_diff_sign = tv_convex_combination(
 487                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 488                 count > 10? sign : sign * time_smooth, &diff,
 489                 &tmp);
 490         stat_task->sa_time_diff = tmp;
 491         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 492                 sign > 0? "+" : "-",
 493                 tv2ms(&diff),
 494                 sa_time_diff_sign ? "+" : "-",
 495                 tv2ms(&stat_task->sa_time_diff)
 496         );
 497 out:
 498         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 499         return count;
 500 }
 501
 502 static int check_stat_line(char *line, __a_unused void *data)
 503 {
 504         int itemnum;
 505         size_t ilen = 0;
 506         long unsigned sec, usec;
 507         char *tmp;
 508
 509         //PARA_INFO_LOG("line: %s\n", line);
 510         if (!line)
 511                 return 1;
 512         itemnum = stat_line_valid(line);
 513         if (itemnum < 0) {
 514                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 515                 return 1;
 516         }
 517         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 518                 return 1;
 519         tmp = make_message("%s\n", line);
 520         stat_client_write(tmp, itemnum);
 521         free(tmp);
 522         free(stat_item_values[itemnum]);
 523         stat_item_values[itemnum] = para_strdup(line);
 524         ilen = strlen(status_item_list[itemnum]);
 525         switch (itemnum) {
 526         case SI_STATUS:
 527                 stat_task->playing = strstr(line, "playing")? 1 : 0;
 528                 PARA_INFO_LOG("stat task playing: %d\n", stat_task->playing);
 529                 break;
 530         case SI_OFFSET:
 531                 stat_task->offset_seconds = atoi(line + ilen + 1);
 532                 break;
 533         case SI_SECONDS_TOTAL:
 534                 stat_task->length_seconds = atoi(line + ilen + 1);
 535                 break;
 536         case SI_STREAM_START:
 537                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 538                         struct timeval a_start, delay;
 539                         delay.tv_sec = conf.stream_delay_arg / 1000;
 540                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 541                         stat_task->server_stream_start.tv_sec = sec;
 542                         stat_task->server_stream_start.tv_usec = usec;
 543                         if (compute_time_diff(NULL) > 2) {
 544                                 if (stat_task->sa_time_diff_sign < 0)
 545                                         tv_add(&stat_task->server_stream_start,
 546                                                 &stat_task->sa_time_diff, &a_start);
 547                                 else
 548                                         tv_diff(&stat_task->server_stream_start,
 549                                                 &stat_task->sa_time_diff, &a_start);
 550                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 551                         }
 552                 }
 553                 break;
 554         case SI_CURRENT_TIME:
 555                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 556                         struct timeval tv = {sec, usec};
 557                         compute_time_diff(&tv);
 558                 }
 559                 break;
 560         case SI_FORMAT:
 561                 stat_task->current_audio_format_num = get_audio_format_num(
 562                         line + ilen + 1);
 563         }
 564         return 1;
 565 }
 566
 567 static int parse_stream_command(const char *txt, char **cmd)
 568 {
 569         char *p = strchr(txt, ':');
 570         int i;
 571
 572         if (!p)
 573                 return -E_MISSING_COLON;
 574         p++;
 575         FOR_EACH_AUDIO_FORMAT(i) {
 576                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 577                         continue;
 578                 *cmd = p;
 579                 return i;
 580         }
 581         return -E_UNSUPPORTED_AUDIO_FORMAT;
 582 }
 583
 584 static int add_filter(int format, char *cmdline)
 585 {
 586         struct audio_format_info *a = &afi[format];
 587         int filter_num, nf = a->num_filters;
 588
 589         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 590         if (filter_num < 0)
 591                 return filter_num;
 592         a->filter_nums[nf] = filter_num;
 593         a->num_filters++;
 594         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 595                 filters[filter_num].name);
 596         return filter_num;
 597 }
 598
 599 static int init_writers(void)
 600 {
 601         int i, ret, nw;
 602         char *cmd;
 603         struct audio_format_info *a;
 604
 605         init_supported_writers();
 606         nw = PARA_MAX(1, conf.writer_given);
 607         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 608         FOR_EACH_AUDIO_FORMAT(i) {
 609                 a = &afi[i];
 610                 a->writer_conf = para_malloc(nw * sizeof(void *));
 611                 a->writers = para_malloc(nw * sizeof(struct writer *));
 612                 a->num_writers = 0;
 613         }
 614         for (i = 0; i < conf.writer_given; i++) {
 615                 void *wconf;
 616                 int writer_num;
 617                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 618                 if (ret < 0)
 619                         goto out;
 620                 a = &afi[ret];
 621                 nw = a->num_writers;
 622                 wconf = check_writer_arg(cmd, &writer_num);
 623                 if (!wconf) {
 624                         ret = writer_num;
 625                         goto out;
 626                 }
 627                 a->writers[nw] = &writers[writer_num];
 628                 a->writer_conf[nw] = wconf;
 629                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 630                         nw, writer_names[writer_num]);
 631                 a->num_writers++;
 632         }
 633         ret = 1;
 634 out:
 635         return ret;
 636 }
 637
 638 static int init_receivers(void)
 639 {
 640         int i, ret, receiver_num;
 641         char *cmd = NULL;
 642         struct audio_format_info *a;
 643
 644         for (i = 0; receivers[i].name; i++) {
 645                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
 646                 receivers[i].init(&receivers[i]);
 647         }
 648         for (i = conf.receiver_given - 1; i >= 0; i--) {
 649                 char *arg = conf.receiver_arg[i];
 650                 char *recv_arg = strchr(arg, ':');
 651                 ret = -E_MISSING_COLON;
 652                 if (!recv_arg)
 653                         goto out;
 654                 *recv_arg = '\0';
 655                 recv_arg++;
 656                 ret = get_audio_format_num(arg);
 657                 if (ret < 0)
 658                         goto out;
 659                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 660                 if (!afi[ret].receiver_conf) {
 661                         ret = -E_RECV_SYNTAX;
 662                         goto out;
 663                 }
 664                 afi[ret].receiver = &receivers[receiver_num];
 665         }
 666         /* use the first available receiver with no arguments
 667          * for those audio formats for which no receiver
 668          * was specified
 669          */
 670         cmd = para_strdup(receivers[0].name);
 671         FOR_EACH_AUDIO_FORMAT(i) {
 672                 a = &afi[i];
 673                 if (a->receiver_conf)
 674                         continue;
 675                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 676                 if (!a->receiver_conf)
 677                         return -E_RECV_SYNTAX;
 678                 a->receiver = &receivers[receiver_num];
 679         }
 680         ret = 1;
 681 out:
 682         free(cmd);
 683         return ret;
 684 }
 685
 686 static int init_default_filters(void)
 687 {
 688         int i, ret = 1;
 689
 690         FOR_EACH_AUDIO_FORMAT(i) {
 691                 struct audio_format_info *a = &afi[i];
 692                 char *tmp;
 693                 int j;
 694
 695                 if (a->num_filters)
 696                         continue; /* no default -- nothing to to */
 697                 /* add "dec" to audio format name */
 698                 tmp = make_message("%sdec", audio_formats[i]);
 699                 for (j = 0; filters[j].name; j++)
 700                         if (!strcmp(tmp, filters[j].name))
 701                                 break;
 702                 free(tmp);
 703                 ret = -E_UNSUPPORTED_FILTER;
 704                 if (!filters[j].name)
 705                         goto out;
 706                 tmp = para_strdup(filters[j].name);
 707                 ret = add_filter(i, tmp);
 708                 free(tmp);
 709                 if (ret < 0)
 710                         goto out;
 711                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 712                         filters[j].name);
 713         }
 714 out:
 715         return ret;
 716 }
 717
 718 static int init_filters(void)
 719 {
 720         int i, ret, nf;
 721
 722         filter_init(filters);
 723         nf = PARA_MAX(1,  conf.filter_given);
 724         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 725         FOR_EACH_AUDIO_FORMAT(i) {
 726                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 727                 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
 728         }
 729         if (!conf.no_default_filters_given)
 730                 return init_default_filters();
 731         for (i = 0; i < conf.filter_given; i++) {
 732                 char *arg = conf.filter_arg[i];
 733                 char *filter_name = strchr(arg, ':');
 734                 ret = -E_MISSING_COLON;
 735                 if (!filter_name)
 736                         goto out;
 737                 *filter_name = '\0';
 738                 filter_name++;
 739                 ret = get_audio_format_num(arg);
 740                 if (ret < 0)
 741                         goto out;
 742                 ret = add_filter(ret, filter_name);
 743                 if (ret < 0)
 744                         goto out;
 745         }
 746         ret = init_default_filters(); /* use default values for the rest */
 747 out:
 748         return ret;
 749 }
 750
 751 static int init_stream_io(void)
 752 {
 753         int ret;
 754
 755         ret = init_writers();
 756         if (ret < 0)
 757                 return ret;
 758         ret = init_receivers();
 759         if (ret < 0)
 760                 return ret;
 761         ret = init_filters();
 762         if (ret < 0)
 763                 return ret;
 764         return 1;
 765 }
 766
 767 /* does not unlink socket on errors */
 768 static int audiod_get_socket(void)
 769 {
 770         struct sockaddr_un unix_addr;
 771         int ret, fd;
 772
 773         if (conf.socket_given)
 774                 socket_name = para_strdup(conf.socket_arg);
 775         else {
 776                 char *hn = para_hostname();
 777                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 778                         hn);
 779                 free(hn);
 780         }
 781         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 782         if (conf.force_given)
 783                 unlink(socket_name);
 784         ret = create_local_socket(socket_name, &unix_addr,
 785                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 786         if (ret < 0)
 787                 goto err;
 788         fd = ret;
 789         if (listen(fd , 5) < 0) {
 790                 ret = -ERRNO_TO_PARA_ERROR(errno);
 791                 goto err;
 792         }
 793         ret = mark_fd_nonblocking(fd);
 794         if (ret < 0)
 795                 goto err;
 796         return fd;
 797 err:
 798         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 799         exit(EXIT_FAILURE);
 800 }
 801
 802 static void signal_pre_select(struct sched *s, struct task *t)
 803 {
 804         struct signal_task *st = container_of(t, struct signal_task, task);
 805         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 806 }
 807
 808 static void signal_post_select(struct sched *s, struct task *t)
 809 {
 810         struct signal_task *st = container_of(t, struct signal_task, task);
 811
 812         if (!FD_ISSET(st->fd, &s->rfds))
 813                 return;
 814
 815         st->signum = para_next_signal();
 816         switch (st->signum) {
 817         case SIGINT:
 818         case SIGTERM:
 819         case SIGHUP:
 820                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 821                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 822         }
 823 }
 824
 825 static void signal_setup_default(struct signal_task *st)
 826 {
 827         st->task.pre_select = signal_pre_select;
 828         st->task.post_select = signal_post_select;
 829         sprintf(st->task.status, "signal task");
 830 }
 831
 832 static void command_pre_select(struct sched *s, struct task *t)
 833 {
 834         struct command_task *ct = container_of(t, struct command_task, task);
 835         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 836 }
 837
 838 static void command_post_select(struct sched *s, struct task *t)
 839 {
 840         int ret;
 841         struct command_task *ct = container_of(t, struct command_task, task);
 842
 843         audiod_status_dump();
 844         if (!FD_ISSET(ct->fd, &s->rfds))
 845                 return;
 846         ret = handle_connect(ct->fd);
 847         if (ret < 0)
 848                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 849 }
 850
 851 static void init_command_task(struct command_task *ct)
 852 {
 853         ct->task.pre_select = command_pre_select;
 854         ct->task.post_select = command_post_select;
 855         ct->task.error = 0;
 856         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 857         sprintf(ct->task.status, "command task");
 858 }
 859
 860 static void close_stat_pipe(void)
 861 {
 862         int i;
 863
 864         if (!stat_task->ct)
 865                 return;
 866         client_close(stat_task->ct);
 867         stat_task->ct = NULL;
 868         FOR_EACH_STATUS_ITEM(i) {
 869                 free(stat_item_values[i]);
 870                 stat_item_values[i] = NULL;
 871         }
 872         dump_empty_status();
 873         stat_task->length_seconds = 0;
 874         stat_task->offset_seconds = 0;
 875         audiod_status_dump();
 876         stat_task->playing = 0;
 877         stat_item_values[SI_BASENAME] = make_message(
 878                 "%s: no connection to para_server\n",
 879                 status_item_list[SI_BASENAME]);
 880         stat_client_write(stat_item_values[SI_BASENAME],
 881                 SI_BASENAME);
 882 }
 883
 884 /**
 885  * close the connection to para_server and exit
 886  *
 887  * \param status the exit status which is passed to exit(3)
 888  * \param msg the log message
 889  *
 890  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
 891  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
 892  * EXIT_FAILURE.
 893  *
 894  * \sa exit(3)
 895  */
 896 void __noreturn clean_exit(int status, const char *msg)
 897 {
 898         PARA_EMERG_LOG("%s\n", msg);
 899         if (socket_name)
 900                 unlink(socket_name);
 901         close_stat_pipe();
 902         exit(status);
 903 }
 904
 905 /* avoid busy loop if server is down */
 906 static void set_stat_task_restart_barrier(unsigned seconds)
 907 {
 908         struct timeval delay = {seconds, 0};
 909         tv_add(now, &delay, &stat_task->restart_barrier);
 910 }
 911
 912 static void try_to_close_slot(int slot_num)
 913 {
 914         struct slot_info *s = &slot[slot_num];
 915
 916         if (s->format < 0)
 917                 return;
 918         if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
 919                 return;
 920         if (s->fc && s->fc->task.error != -E_TASK_UNREGISTERED)
 921                 return;
 922         if (s->wng && s->wng->task.error != -E_TASK_UNREGISTERED)
 923                 return;
 924         PARA_INFO_LOG("closing slot %d\n", slot_num);
 925         wng_close(s->wng);
 926         close_filters(s->fc);
 927         free(s->fc);
 928         close_receiver(slot_num);
 929         clear_slot(slot_num);
 930 }
 931
 932 /*
 933  * Check if any receivers/filters/writers need to be started and do so if
 934  * necessary.
 935  */
 936 static void start_stop_decoders(struct sched *s)
 937 {
 938         int i;
 939
 940         FOR_EACH_SLOT(i)
 941                 try_to_close_slot(i);
 942         if (audiod_status != AUDIOD_ON || !stat_task->playing)
 943                 return kill_all_decoders(-E_NOT_PLAYING);
 944         open_current_receiver(s);
 945         FOR_EACH_SLOT(i) {
 946                 struct slot_info *sl = &slot[i];
 947                 struct audio_format_info *a;
 948                 struct timeval diff;
 949
 950                 if (sl->format < 0)
 951                         continue;
 952                 a = &afi[sl->format];
 953                 if (!sl->receiver_node)
 954                         continue;
 955                 if ((!a->num_filters || sl->fc) && sl->wng)
 956                         continue; /* everything already started */
 957                 if (!a->num_filters) {
 958                         if (sl->receiver_node->loaded && !sl->wng) {
 959                                 open_writers(i);
 960                         }
 961                         continue;
 962                 }
 963                 if (sl->receiver_node->loaded && !sl->fc) {
 964                         open_filters(i);
 965                         continue;
 966                 }
 967                 if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
 968                         continue;
 969                 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
 970                         open_writers(i);
 971                         continue;
 972                 }
 973                 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
 974                 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
 975                         s->timeout = diff;
 976                 }
 977         }
 978 }
 979
 980
 981 /* restart the client task if necessary */
 982 static void status_pre_select(struct sched *s, struct task *t)
 983 {
 984         struct status_task *st = container_of(t, struct status_task, task);
 985
 986         if (audiod_status == AUDIOD_OFF) {
 987                 if (!st->ct)
 988                         goto out;
 989                 if (st->ct->task.error >= 0) {
 990                         st->ct->task.error = -E_AUDIOD_OFF;
 991                         goto out;
 992                 }
 993                 if (st->ct->task.error != -E_TASK_UNREGISTERED)
 994                         goto out;
 995                 close_stat_pipe();
 996                 st->clock_diff_count = conf.clock_diff_count_arg;
 997                 goto out;
 998         }
 999         if (st->ct) {
1000                 unsigned bytes_left;
1001                 if (st->ct->task.error < 0) {
1002                         if (st->ct->task.error != -E_TASK_UNREGISTERED)
1003                                 goto out;
1004                         close_stat_pipe();
1005                         goto out;
1006                 }
1007                 if (st->ct->status != CL_RECEIVING)
1008                         goto out;
1009                 bytes_left = for_each_line(st->ct->buf, st->ct->loaded,
1010                         &check_stat_line, NULL);
1011                 if (st->ct->loaded != bytes_left) {
1012                         st->last_status_read = *now;
1013                         st->ct->loaded = bytes_left;
1014                 } else {
1015                         struct timeval diff;
1016                         tv_diff(now, &st->last_status_read, &diff);
1017                         if (diff.tv_sec > 61)
1018                                 st->ct->task.error = -E_STATUS_TIMEOUT;
1019                 }
1020                 goto out;
1021         }
1022         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1023                 goto out;
1024         if (st->clock_diff_count) { /* get status only one time */
1025                 char *argv[] = {"audiod", "stat", "1", NULL};
1026                 int argc = 3;
1027                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1028                 st->clock_diff_count--;
1029                 client_open(argc, argv, &st->ct);
1030                 set_stat_task_restart_barrier(2);
1031
1032         } else {
1033                 char *argv[] = {"audiod", "stat", NULL};
1034                 int argc = 2;
1035                 client_open(argc, argv, &st->ct);
1036                 set_stat_task_restart_barrier(5);
1037         }
1038         st->last_status_read = *now;
1039 out:
1040         start_stop_decoders(s);
1041 }
1042
1043 static void init_status_task(struct status_task *st)
1044 {
1045         memset(st, 0, sizeof(struct status_task));
1046         st->task.pre_select = status_pre_select;
1047         st->sa_time_diff_sign = 1;
1048         st->clock_diff_count = conf.clock_diff_count_arg;
1049         st->current_audio_format_num = -1;
1050         sprintf(st->task.status, "status task");
1051 }
1052
1053 static void set_initial_status(void)
1054 {
1055         audiod_status = AUDIOD_ON;
1056         if (!conf.mode_given)
1057                 return;
1058         if (!strcmp(conf.mode_arg, "sb")) {
1059                 audiod_status = AUDIOD_STANDBY;
1060                 return;
1061         }
1062         if (!strcmp(conf.mode_arg, "off")) {
1063                 audiod_status = AUDIOD_OFF;
1064                 return;
1065         }
1066         if (strcmp(conf.mode_arg, "on"))
1067                 PARA_WARNING_LOG("invalid mode\n");
1068 }
1069
1070 /**
1071  * the main function of para_audiod
1072  *
1073  * \param argc usual argument count
1074  * \param argv usual argument vector
1075  *
1076  * \return EXIT_SUCCESS or EXIT_FAILURE
1077  *
1078  * \sa para_audiod(1)
1079  * */
1080 int main(int argc, char *argv[])
1081 {
1082         char *config_file;
1083         int ret, i;
1084         static struct sched s;
1085         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1086         struct audiod_cmdline_parser_params params = {
1087                 .override = 0,
1088                 .initialize = 1,
1089                 .check_required = 0,
1090                 .check_ambiguity = 0,
1091                 .print_errors = 1
1092         };
1093
1094         valid_fd_012();
1095         audiod_cmdline_parser_ext(argc, argv, &conf, &params);
1096         HANDLE_VERSION_FLAG("audiod", conf);
1097         para_drop_privileges(conf.user_arg, conf.group_arg);
1098         config_file = configfile_exists();
1099         if (config_file) {
1100                 params.override = 0;
1101                 params.initialize = 0;
1102                 params.check_required = 1;
1103                 params.check_ambiguity = 0;
1104                 params.print_errors = 1;
1105                 if (audiod_cmdline_parser_config_file(config_file, &conf, &params)) {
1106                         PARA_EMERG_LOG("parse error in config file\n");
1107                         exit(EXIT_FAILURE);
1108                 }
1109                 free(config_file);
1110         }
1111         if (conf.logfile_given)
1112                 logfile = open_log(conf.logfile_arg);
1113         log_welcome("para_audiod", conf.loglevel_arg);
1114         i = init_stream_io();
1115         if (i < 0) {
1116                 PARA_EMERG_LOG("init stream io error: %s\n", para_strerror(-i));
1117                 exit(EXIT_FAILURE);
1118         }
1119         server_uptime(UPTIME_SET);
1120         set_initial_status();
1121         FOR_EACH_SLOT(i)
1122                 clear_slot(i);
1123         init_grabbing();
1124         setup_signal_handling();
1125         signal_setup_default(sig_task);
1126
1127         init_status_task(stat_task);
1128         init_command_task(cmd_task);
1129
1130         if (conf.daemon_given)
1131                 daemon_init();
1132
1133         register_task(&sig_task->task);
1134         register_task(&cmd_task->task);
1135         register_task(&stat_task->task);
1136         s.default_timeout.tv_sec = 0;
1137         s.default_timeout.tv_usec = 99 * 1000;
1138         ret = schedule(&s);
1139
1140         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1141         return EXIT_FAILURE;
1142 }