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 + 1,  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 #if 0
 342 static void rn_event_handler(struct task *t)
 343 {
 344         struct receiver_node *rn = t->private_data;
 345         int i;
 346
 347         PARA_NOTICE_LOG("%s\n", para_strerror(-t->ret));
 348         unregister_task(t);
 349         rn->error = t->ret;
 350         /* set restart barrier */
 351         FOR_EACH_SLOT(i) {
 352                 struct timeval restart_delay = {0, 10 * 1000};
 353                 if (slot[i].receiver_node != rn)
 354                         continue;
 355                 if (rn->error != -E_RECV_EOF)
 356                         /* don't reconnect immediately on errors */
 357                         restart_delay.tv_sec = 5;
 358                 tv_add(now, &restart_delay, &afi[slot[i].format].restart_barrier);
 359         }
 360 }
 361 #endif
 362
 363 static int open_receiver(int format)
 364 {
 365         struct audio_format_info *a = &afi[format];
 366         struct slot_info *s;
 367         int ret, slot_num;
 368         struct receiver_node *rn;
 369         const struct timeval restart_delay = {1, 0};
 370
 371         ret = get_empty_slot();
 372         if (ret < 0)
 373                 goto err;
 374         slot_num = ret;
 375         s = &slot[slot_num];
 376         s->format = format;
 377         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 378         rn = s->receiver_node;
 379         rn->receiver = a->receiver;
 380         rn->conf = a->receiver_conf;
 381         ret = a->receiver->open(s->receiver_node);
 382         if (ret < 0) {
 383                 free(s->receiver_node);
 384                 s->receiver_node = NULL;
 385                 goto err;
 386         }
 387         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 388                 audio_formats[s->format], a->receiver->name, slot_num);
 389         rn->task.pre_select = a->receiver->pre_select;
 390         rn->task.post_select = a->receiver->post_select;
 391         sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
 392         register_task(&rn->task);
 393         return 1;
 394 err:
 395         PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 396         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 397         return ret;
 398 }
 399
 400 static int receiver_running(int format)
 401 {
 402         int i;
 403
 404         FOR_EACH_SLOT(i) {
 405                 struct slot_info *s = &slot[i];
 406                 if (s->format == format && s->receiver_node
 407                                 && s->receiver_node->task.error >= 0)
 408                         return 1;
 409         }
 410         return 0;
 411 }
 412
 413 static int open_current_receiver(struct sched *s)
 414 {
 415         struct timeval diff;
 416         int cafn = stat_task->current_audio_format_num;
 417
 418         if (cafn < 0 || !stat_task->ct)
 419                 return 0;
 420         if (receiver_running(cafn))
 421                 return 0;
 422         if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
 423                 s->timeout = diff;
 424                 return 0;
 425         }
 426         return open_receiver(cafn) < 0? 0 : 1;
 427 }
 428
 429 static unsigned compute_time_diff(const struct timeval *status_time)
 430 {
 431         struct timeval tmp, diff;
 432         static unsigned count;
 433         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 434         const struct timeval max_deviation = {0, 500 * 1000};
 435         const int time_smooth = 5;
 436
 437         if (!status_time)
 438                 return count;
 439         sign = tv_diff(status_time, now, &diff);
 440 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 441 //                      sign, sa_time_diff_sign);
 442         if (!count) {
 443                 sa_time_diff_sign = sign;
 444                 stat_task->sa_time_diff = diff;
 445                 count++;
 446                 goto out;
 447         }
 448         if (count > 5) {
 449                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 450                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 451                         PARA_WARNING_LOG("time diff jump: %lims\n",
 452                                 s * tv2ms(&tmp));
 453         }
 454         count++;
 455         sa_time_diff_sign = tv_convex_combination(
 456                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 457                 count > 10? sign : sign * time_smooth, &diff,
 458                 &tmp);
 459         stat_task->sa_time_diff = tmp;
 460         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 461                 sign > 0? "+" : "-",
 462                 tv2ms(&diff),
 463                 sa_time_diff_sign ? "+" : "-",
 464                 tv2ms(&stat_task->sa_time_diff)
 465         );
 466 out:
 467         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 468         return count;
 469 }
 470
 471 static int check_stat_line(char *line, __a_unused void *data)
 472 {
 473         int itemnum;
 474         size_t ilen = 0;
 475         long unsigned sec, usec;
 476         char *tmp;
 477
 478         //PARA_INFO_LOG("line: %s\n", line);
 479         if (!line)
 480                 return 1;
 481         itemnum = stat_line_valid(line);
 482         if (itemnum < 0) {
 483                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 484                 return 1;
 485         }
 486         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 487                 return 1;
 488         tmp = make_message("%s\n", line);
 489         stat_client_write(tmp, itemnum);
 490         free(tmp);
 491         free(stat_task->stat_item_values[itemnum]);
 492         stat_task->stat_item_values[itemnum] = para_strdup(line);
 493         ilen = strlen(status_item_list[itemnum]);
 494         switch (itemnum) {
 495         case SI_STATUS:
 496                 stat_task->playing = strstr(line, "playing")? 1 : 0;
 497                 PARA_INFO_LOG("stat task playing: %d\n", stat_task->playing);
 498                 break;
 499         case SI_OFFSET:
 500                 stat_task->offset_seconds = atoi(line + ilen + 1);
 501                 break;
 502         case SI_SECONDS_TOTAL:
 503                 stat_task->length_seconds = atoi(line + ilen + 1);
 504                 break;
 505         case SI_STREAM_START:
 506                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 507                         struct timeval a_start, delay;
 508                         delay.tv_sec = conf.stream_delay_arg / 1000;
 509                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 510                         stat_task->server_stream_start.tv_sec = sec;
 511                         stat_task->server_stream_start.tv_usec = usec;
 512                         if (compute_time_diff(NULL) > 2) {
 513                                 if (stat_task->sa_time_diff_sign < 0)
 514                                         tv_add(&stat_task->server_stream_start,
 515                                                 &stat_task->sa_time_diff, &a_start);
 516                                 else
 517                                         tv_diff(&stat_task->server_stream_start,
 518                                                 &stat_task->sa_time_diff, &a_start);
 519                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 520                         }
 521                 }
 522                 break;
 523         case SI_CURRENT_TIME:
 524                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 525                         struct timeval tv = {sec, usec};
 526                         compute_time_diff(&tv);
 527                 }
 528                 if (stat_task->clock_diff_count)
 529                         stat_task->clock_diff_count--;
 530                 break;
 531         case SI_FORMAT:
 532                 stat_task->current_audio_format_num = get_audio_format_num(
 533                         line + ilen + 1);
 534         }
 535         return 1;
 536 }
 537
 538 static void try_to_close_slot(int slot_num)
 539 {
 540         struct slot_info *s = &slot[slot_num];
 541
 542         if (s->format < 0)
 543                 return;
 544         if (s->receiver_node && s->receiver_node->task.error >= 0)
 545                 return;
 546         if (s->fc && s->fc->task.error >= 0)
 547                 return;
 548         if (s->wng && s->wng->task.error >= 0)
 549                 return;
 550         PARA_INFO_LOG("closing slot %d\n", slot_num);
 551         wng_close(s->wng);
 552         close_filters(s->fc);
 553         free(s->fc);
 554         close_receiver(slot_num);
 555         clear_slot(slot_num);
 556 }
 557
 558 /*
 559  * Check if any receivers/filters/writers need to be started and do so if
 560  * necessary.  Since the pre_select function didn't have a chance yet to put
 561  * file descriptors into the fd sets given by s, make the upcoming select()
 562  * return immediately to avoid a long timeout in case we started something.
 563  */
 564 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
 565 {
 566         int i;
 567         struct timeval min_delay = {0, 1};
 568
 569         if (audiod_status != AUDIOD_ON || !stat_task->playing)
 570                 return kill_all_decoders(-E_NOT_PLAYING);
 571         if (open_current_receiver(s))
 572                 s->timeout = min_delay;
 573         FOR_EACH_SLOT(i) {
 574                 struct slot_info *sl = &slot[i];
 575                 struct audio_format_info *a;
 576                 struct timeval diff;
 577
 578                 if (sl->format < 0)
 579                         continue;
 580                 a = &afi[sl->format];
 581                 if (!sl->receiver_node)
 582                         continue;
 583                 if ((!a->num_filters || sl->fc) && sl->wng)
 584                         continue; /* everything already started */
 585                 if (!a->num_filters) {
 586                         if (sl->receiver_node->loaded && !sl->wng) {
 587                                 open_writers(i);
 588                                 s->timeout = min_delay;
 589                         }
 590                         continue;
 591                 }
 592                 if (sl->receiver_node->loaded && !sl->fc) {
 593                         open_filters(i);
 594                         s->timeout = min_delay;
 595                         continue;
 596                 }
 597                 if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
 598                         continue;
 599                 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
 600                         open_writers(i);
 601                         s->timeout = min_delay;
 602                         continue;
 603                 }
 604                 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
 605                 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
 606                         s->timeout = diff;
 607                 }
 608         }
 609 }
 610
 611 static void audiod_post_select(__a_unused struct sched *s,
 612         __a_unused struct task *t)
 613 {
 614         int i;
 615
 616         FOR_EACH_SLOT(i)
 617                 try_to_close_slot(i);
 618 }
 619
 620 static void init_audiod_task(struct task *t)
 621 {
 622         t->pre_select = audiod_pre_select;
 623         t->post_select = audiod_post_select;
 624         t->error = 0;
 625         sprintf(t->status, "audiod task");
 626 }
 627
 628 static int parse_stream_command(const char *txt, char **cmd)
 629 {
 630         char *p = strchr(txt, ':');
 631         int i;
 632
 633         if (!p)
 634                 return -E_MISSING_COLON;
 635         p++;
 636         FOR_EACH_AUDIO_FORMAT(i) {
 637                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 638                         continue;
 639                 *cmd = p;
 640                 return i;
 641         }
 642         return -E_UNSUPPORTED_AUDIO_FORMAT;
 643 }
 644
 645 static int add_filter(int format, char *cmdline)
 646 {
 647         struct audio_format_info *a = &afi[format];
 648         int filter_num, nf = a->num_filters;
 649
 650         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 651         if (filter_num < 0)
 652                 return filter_num;
 653         a->filter_nums[nf] = filter_num;
 654         a->num_filters++;
 655         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
 656                 filters[filter_num].name);
 657         return filter_num;
 658 }
 659
 660 static int init_writers(void)
 661 {
 662         int i, ret, nw;
 663         char *cmd;
 664         struct audio_format_info *a;
 665
 666         init_supported_writers();
 667         nw = PARA_MAX(1, conf.writer_given);
 668         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 669         FOR_EACH_AUDIO_FORMAT(i) {
 670                 a = &afi[i];
 671                 a->writer_conf = para_malloc(nw * sizeof(void *));
 672                 a->writers = para_malloc(nw * sizeof(struct writer *));
 673                 a->num_writers = 0;
 674         }
 675         for (i = 0; i < conf.writer_given; i++) {
 676                 void *wconf;
 677                 int writer_num;
 678                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 679                 if (ret < 0)
 680                         goto out;
 681                 a = &afi[ret];
 682                 nw = a->num_writers;
 683                 wconf = check_writer_arg(cmd, &writer_num);
 684                 if (!wconf) {
 685                         ret = writer_num;
 686                         goto out;
 687                 }
 688                 a->writers[nw] = &writers[writer_num];
 689                 a->writer_conf[nw] = wconf;
 690                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 691                         nw, writer_names[writer_num]);
 692                 a->num_writers++;
 693         }
 694         ret = 1;
 695 out:
 696         return ret;
 697 }
 698
 699 static int init_receivers(void)
 700 {
 701         int i, ret, receiver_num;
 702         char *cmd = NULL;
 703         struct audio_format_info *a;
 704
 705         for (i = 0; receivers[i].name; i++) {
 706                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
 707                 receivers[i].init(&receivers[i]);
 708         }
 709         for (i = conf.receiver_given - 1; i >= 0; i--) {
 710                 char *arg = conf.receiver_arg[i];
 711                 char *recv_arg = strchr(arg, ':');
 712                 ret = -E_MISSING_COLON;
 713                 if (!recv_arg)
 714                         goto out;
 715                 *recv_arg = '\0';
 716                 recv_arg++;
 717                 ret = get_audio_format_num(arg);
 718                 if (ret < 0)
 719                         goto out;
 720                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 721                 if (!afi[ret].receiver_conf) {
 722                         ret = -E_RECV_SYNTAX;
 723                         goto out;
 724                 }
 725                 afi[ret].receiver = &receivers[receiver_num];
 726         }
 727         /* use the first available receiver with no arguments
 728          * for those audio formats for which no receiver
 729          * was specified
 730          */
 731         cmd = para_strdup(receivers[0].name);
 732         FOR_EACH_AUDIO_FORMAT(i) {
 733                 a = &afi[i];
 734                 if (a->receiver_conf)
 735                         continue;
 736                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 737                 if (!a->receiver_conf)
 738                         return -E_RECV_SYNTAX;
 739                 a->receiver = &receivers[receiver_num];
 740         }
 741         ret = 1;
 742 out:
 743         free(cmd);
 744         return ret;
 745 }
 746
 747 static int init_default_filters(void)
 748 {
 749         int i, ret = 1;
 750
 751         FOR_EACH_AUDIO_FORMAT(i) {
 752                 struct audio_format_info *a = &afi[i];
 753                 char *tmp;
 754                 int j;
 755
 756                 if (a->num_filters)
 757                         continue; /* no default -- nothing to to */
 758                 /* add "dec" to audio format name */
 759                 tmp = make_message("%sdec", audio_formats[i]);
 760                 for (j = 0; filters[j].name; j++)
 761                         if (!strcmp(tmp, filters[j].name))
 762                                 break;
 763                 free(tmp);
 764                 ret = -E_UNSUPPORTED_FILTER;
 765                 if (!filters[j].name)
 766                         goto out;
 767                 tmp = para_strdup(filters[j].name);
 768                 ret = add_filter(i, tmp);
 769                 free(tmp);
 770                 if (ret < 0)
 771                         goto out;
 772                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 773                         filters[j].name);
 774         }
 775 out:
 776         return ret;
 777 }
 778
 779 static int init_filters(void)
 780 {
 781         int i, ret, nf;
 782
 783         filter_init(filters);
 784         nf = PARA_MAX(1,  conf.filter_given);
 785         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 786         FOR_EACH_AUDIO_FORMAT(i) {
 787                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 788                 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
 789         }
 790         if (!conf.no_default_filters_given)
 791                 return init_default_filters();
 792         for (i = 0; i < conf.filter_given; i++) {
 793                 char *arg = conf.filter_arg[i];
 794                 char *filter_name = strchr(arg, ':');
 795                 ret = -E_MISSING_COLON;
 796                 if (!filter_name)
 797                         goto out;
 798                 *filter_name = '\0';
 799                 filter_name++;
 800                 ret = get_audio_format_num(arg);
 801                 if (ret < 0)
 802                         goto out;
 803                 ret = add_filter(ret, filter_name);
 804                 if (ret < 0)
 805                         goto out;
 806         }
 807         ret = init_default_filters(); /* use default values for the rest */
 808 out:
 809         return ret;
 810 }
 811
 812 static int init_stream_io(void)
 813 {
 814         int ret;
 815
 816         ret = init_writers();
 817         if (ret < 0)
 818                 return ret;
 819         ret = init_receivers();
 820         if (ret < 0)
 821                 return ret;
 822         ret = init_filters();
 823         if (ret < 0)
 824                 return ret;
 825         return 1;
 826 }
 827
 828 /* does not unlink socket on errors */
 829 static int audiod_get_socket(void)
 830 {
 831         struct sockaddr_un unix_addr;
 832         int ret, fd;
 833
 834         if (conf.socket_given)
 835                 socket_name = para_strdup(conf.socket_arg);
 836         else {
 837                 char *hn = para_hostname();
 838                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 839                         hn);
 840                 free(hn);
 841         }
 842         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 843         if (conf.force_given)
 844                 unlink(socket_name);
 845         ret = create_local_socket(socket_name, &unix_addr,
 846                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 847         if (ret < 0)
 848                 goto err;
 849         fd = ret;
 850         if (listen(fd , 5) < 0) {
 851                 ret = -ERRNO_TO_PARA_ERROR(errno);
 852                 goto err;
 853         }
 854         ret = mark_fd_nonblocking(fd);
 855         if (ret < 0)
 856                 goto err;
 857         return fd;
 858 err:
 859         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 860         exit(EXIT_FAILURE);
 861 }
 862
 863 static void signal_pre_select(struct sched *s, struct task *t)
 864 {
 865         struct signal_task *st = container_of(t, struct signal_task, task);
 866         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 867 }
 868
 869 static void signal_post_select(struct sched *s, struct task *t)
 870 {
 871         struct signal_task *st = container_of(t, struct signal_task, task);
 872         int signum;
 873
 874         if (!FD_ISSET(st->fd, &s->rfds))
 875                 return;
 876
 877         signum = para_next_signal();
 878         switch (signum) {
 879         case SIGINT:
 880         case SIGTERM:
 881         case SIGHUP:
 882                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 883                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 884         }
 885 }
 886
 887 static void signal_setup_default(struct signal_task *st)
 888 {
 889         st->task.pre_select = signal_pre_select;
 890         st->task.post_select = signal_post_select;
 891         sprintf(st->task.status, "signal task");
 892 }
 893
 894 static void command_pre_select(struct sched *s, struct task *t)
 895 {
 896         struct command_task *ct = container_of(t, struct command_task, task);
 897         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 898 }
 899
 900 static void command_post_select(struct sched *s, struct task *t)
 901 {
 902         int ret;
 903         struct command_task *ct = container_of(t, struct command_task, task);
 904
 905         audiod_status_dump();
 906         if (!FD_ISSET(ct->fd, &s->rfds))
 907                 return;
 908         ret = handle_connect(ct->fd);
 909         if (ret < 0)
 910                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 911 }
 912
 913 static void init_command_task(struct command_task *ct)
 914 {
 915         ct->task.pre_select = command_pre_select;
 916         ct->task.post_select = command_post_select;
 917         ct->task.error = 0;
 918         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 919         sprintf(ct->task.status, "command task");
 920 }
 921
 922 static void close_stat_pipe(void)
 923 {
 924         int i;
 925
 926         if (!stat_task->ct)
 927                 return;
 928         client_close(stat_task->ct);
 929         stat_task->ct = NULL;
 930         FOR_EACH_STATUS_ITEM(i) {
 931                 free(stat_task->stat_item_values[i]);
 932                 stat_task->stat_item_values[i] = NULL;
 933         }
 934         dump_empty_status();
 935         stat_task->length_seconds = 0;
 936         stat_task->offset_seconds = 0;
 937         audiod_status_dump();
 938         stat_task->playing = 0;
 939         stat_task->stat_item_values[SI_BASENAME] = make_message(
 940                 "%s: no connection to para_server\n",
 941                 status_item_list[SI_BASENAME]);
 942         stat_client_write(stat_task->stat_item_values[SI_BASENAME],
 943                 SI_BASENAME);
 944         if (stat_task->clock_diff_count) {
 945                 stat_task->clock_diff_barrier.tv_sec = now->tv_sec + 1;
 946                 stat_task->clock_diff_barrier.tv_usec = now->tv_usec;
 947         }
 948 }
 949
 950 /**
 951  * close the connection to para_server and exit
 952  *
 953  * \param status the exit status which is passed to exit(3)
 954  * \param msg the log message
 955  *
 956  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
 957  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
 958  * EXIT_FAILURE.
 959  *
 960  * \sa exit(3)
 961  */
 962 void __noreturn clean_exit(int status, const char *msg)
 963 {
 964         PARA_EMERG_LOG("%s\n", msg);
 965         if (socket_name)
 966                 unlink(socket_name);
 967         close_stat_pipe();
 968         exit(status);
 969 }
 970
 971 /* avoid busy loop if server is down */
 972 static void set_stat_task_restart_barrier(void)
 973 {
 974         struct timeval delay = {5, 0};
 975         tv_add(now, &delay, &stat_task->restart_barrier);
 976 }
 977
 978 /* restart the client task if necessary */
 979 static void status_pre_select(struct sched *s, struct task *t)
 980 {
 981         struct status_task *st = container_of(t, struct status_task, task);
 982         int ret;
 983
 984         if (st->ct || audiod_status == AUDIOD_OFF) /* no need to restart */
 985                 return;
 986         if (!st->clock_diff_count && tv_diff(now, &st->restart_barrier, NULL)
 987                         < 0)
 988                 return;
 989         if (st->clock_diff_count) { /* get status only one time */
 990                 char *argv[] = {"audiod", "stat", "1", NULL};
 991                 int argc = 3;
 992                 if (tv_diff(now, &st->clock_diff_barrier, NULL) < 0)
 993                         return;
 994                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
 995                 ret = client_open(argc, argv, &st->ct);
 996
 997         } else {
 998                 char *argv[] = {"audiod", "stat", NULL};
 999                 int argc = 2;
1000                 ret = client_open(argc, argv, &st->ct);
1001         }
1002         set_stat_task_restart_barrier();
1003         if (ret < 0)
1004                 return;
1005         s->timeout.tv_sec = 0;
1006         s->timeout.tv_usec = 1;
1007 }
1008
1009 static void status_post_select(__a_unused struct sched *s, struct task *t)
1010 {
1011         struct status_task *st = container_of(t, struct status_task, task);
1012         unsigned bytes_left;
1013
1014         if (!st->ct || st->ct->status != CL_RECEIVING)
1015                 return;
1016         if (audiod_status == AUDIOD_OFF || st->ct->task.error < 0) {
1017                 if (st->ct->task.error >= 0)
1018                         unregister_task(&st->ct->task);
1019                 if (audiod_status == AUDIOD_OFF)
1020                         st->clock_diff_count = conf.clock_diff_count_arg;
1021                 close_stat_pipe();
1022                 return;
1023         }
1024         bytes_left = for_each_line(st->ct->buf, st->ct->loaded,
1025                 &check_stat_line, NULL);
1026         if (st->ct->loaded != bytes_left) {
1027                 st->last_status_read = *now;
1028                 st->ct->loaded = bytes_left;
1029         } else {
1030                 struct timeval diff;
1031                 tv_diff(now, &st->last_status_read, &diff);
1032                 if (diff.tv_sec > 61)
1033                         close_stat_pipe();
1034         }
1035 }
1036
1037 static void init_status_task(struct status_task *st)
1038 {
1039         memset(st, 0, sizeof(struct status_task));
1040         st->task.pre_select = status_pre_select;
1041         st->task.post_select = status_post_select;
1042         st->sa_time_diff_sign = 1;
1043         st->clock_diff_count = conf.clock_diff_count_arg;
1044         st->current_audio_format_num = -1;
1045         sprintf(st->task.status, "status task");
1046 }
1047
1048 static void set_initial_status(void)
1049 {
1050         audiod_status = AUDIOD_ON;
1051         if (!conf.mode_given)
1052                 return;
1053         if (!strcmp(conf.mode_arg, "sb")) {
1054                 audiod_status = AUDIOD_STANDBY;
1055                 return;
1056         }
1057         if (!strcmp(conf.mode_arg, "off")) {
1058                 audiod_status = AUDIOD_OFF;
1059                 return;
1060         }
1061         if (strcmp(conf.mode_arg, "on"))
1062                 PARA_WARNING_LOG("invalid mode\n");
1063 }
1064
1065 /**
1066  * the main function of para_audiod
1067  *
1068  * \param argc usual argument count
1069  * \param argv usual argument vector
1070  *
1071  * \return EXIT_SUCCESS or EXIT_FAILURE
1072  *
1073  * \sa para_audiod(1)
1074  * */
1075 int main(int argc, char *argv[])
1076 {
1077         char *config_file;
1078         int ret, i;
1079         struct sched s;
1080         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1081         struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1082
1083         valid_fd_012();
1084         audiod_cmdline_parser(argc, argv, &conf);
1085         HANDLE_VERSION_FLAG("audiod", conf);
1086         para_drop_privileges(conf.user_arg, conf.group_arg);
1087         config_file = configfile_exists();
1088         if (config_file) {
1089                 struct audiod_cmdline_parser_params params = {
1090                         .override = 0,
1091                         .initialize = 0,
1092                         .check_required = 0,
1093                         .check_ambiguity = 0
1094
1095                 };
1096                 if (audiod_cmdline_parser_config_file(config_file, &conf, &params)) {
1097                         PARA_EMERG_LOG("parse error in config file\n");
1098                         exit(EXIT_FAILURE);
1099                 }
1100                 free(config_file);
1101         }
1102         if (conf.logfile_given)
1103                 logfile = open_log(conf.logfile_arg);
1104         log_welcome("para_audiod", conf.loglevel_arg);
1105         i = init_stream_io();
1106         if (i < 0) {
1107                 PARA_EMERG_LOG("init stream io error: %s\n", para_strerror(-i));
1108                 exit(EXIT_FAILURE);
1109         }
1110         server_uptime(UPTIME_SET);
1111         set_initial_status();
1112         FOR_EACH_SLOT(i)
1113                 clear_slot(i);
1114         init_grabbing();
1115         setup_signal_handling();
1116         signal_setup_default(sig_task);
1117
1118         init_status_task(stat_task);
1119         init_command_task(cmd_task);
1120         init_audiod_task(audiod_task);
1121
1122         if (conf.daemon_given)
1123                 daemon_init();
1124
1125         register_task(&sig_task->task);
1126         register_task(&cmd_task->task);
1127         register_task(&stat_task->task);
1128         register_task(audiod_task);
1129         s.default_timeout.tv_sec = 0;
1130         s.default_timeout.tv_usec = 99 * 1000;
1131         ret = schedule(&s);
1132
1133         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1134         return EXIT_FAILURE;
1135 }