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