audiod.c

   1 /*
   2  * Copyright (C) 2005-2007 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         /** pointer to the array of filters to be activated */
  45         struct filter **filters;
  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 (!hostname)
 148                 hostname = para_hostname();
 149         outfd = logfile? logfile : stderr;
 150         time(&t1);
 151         tm = localtime(&t1);
 152         strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
 153         fprintf(outfd, "%s %s ", str, hostname);
 154         if (conf.loglevel_arg <= INFO)
 155                 fprintf(outfd, "%i ", ll);
 156         va_start(argp, fmt);
 157         vfprintf(outfd, fmt, argp);
 158         va_end(argp);
 159 }
 160
 161 static char *configfile_exists(void)
 162 {
 163         char *home = para_homedir();
 164         char *config_file = make_message("%s/.paraslash/audiod.conf",
 165                 home);
 166         free(home);
 167         if (file_exists(config_file))
 168                 return config_file;
 169         free(config_file);
 170         return NULL;
 171 }
 172
 173 static void setup_signal_handling(void)
 174 {
 175         sig_task->fd = para_signal_init();
 176         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 177         para_install_sighandler(SIGINT);
 178         para_install_sighandler(SIGTERM);
 179         para_install_sighandler(SIGHUP);
 180         signal(SIGPIPE, SIG_IGN);
 181 }
 182
 183 static void clear_slot(int slot_num)
 184 {
 185         struct slot_info *s = &slot[slot_num];
 186
 187         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 188         memset(s, 0, sizeof(struct slot_info));
 189         s->format = -1;
 190 }
 191
 192 static void close_receiver(int slot_num)
 193 {
 194         struct slot_info *s = &slot[slot_num];
 195         struct audio_format_info *a;
 196
 197         if (s->format < 0 || !s->receiver_node)
 198                 return;
 199         a = &afi[s->format];
 200         PARA_NOTICE_LOG("closing %s receiver in slot %d (eof = %d)\n",
 201                 audio_formats[s->format] , slot_num, s->receiver_node->eof);
 202         a->receiver->close(s->receiver_node);
 203         free(s->receiver_node);
 204         s->receiver_node = NULL;
 205 }
 206
 207 static void kill_all_decoders(void)
 208 {
 209         int i;
 210
 211         FOR_EACH_SLOT(i) {
 212                 struct slot_info *s = &slot[i];
 213                 if (s->wng && !s->wng->eof) {
 214                         PARA_INFO_LOG("unregistering writer node group in slot %d\n",
 215                                 i);
 216                         wng_unregister(s->wng);
 217                         s->wng->eof = 1;
 218                 }
 219                 if (s->fc && !s->fc->eof) {
 220                         PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
 221                         unregister_task(&s->fc->task);
 222                         s->fc->eof = 1;
 223                 }
 224                 if (s->receiver_node && !s->receiver_node->eof) {
 225                         PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
 226                         unregister_task(&s->receiver_node->task);
 227                         s->receiver_node->eof = 1;
 228                 }
 229         }
 230 }
 231
 232 static int get_empty_slot(void)
 233 {
 234         int i;
 235         struct slot_info *s;
 236
 237         FOR_EACH_SLOT(i) {
 238                 s = &slot[i];
 239                 if (s->format < 0) {
 240                         clear_slot(i);
 241                         return i;
 242                 }
 243                 if (s->wng || s->receiver_node || s->fc)
 244                         continue;
 245                 clear_slot(i);
 246                 return i;
 247         }
 248         return -E_NO_MORE_SLOTS;
 249 }
 250
 251 /**
 252  * get the number of filters
 253  *
 254  * \param audio_format_num the number identifying the audio format
 255  *
 256  * \return the number of filters for the given audio format
 257  *
 258  * \sa struct filter;
 259  */
 260 int num_filters(int audio_format_num)
 261 {
 262         return afi[audio_format_num].num_filters;
 263 }
 264
 265 static void filter_event_handler(struct task *t)
 266 {
 267         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 268         struct filter_chain *fc = t->private_data;
 269         fc->eof = 1;
 270         unregister_task(t);
 271 }
 272
 273 static void open_filters(int slot_num)
 274 {
 275         struct slot_info *s = &slot[slot_num];
 276         struct audio_format_info *a = &afi[s->format];
 277         int nf = a->num_filters;
 278         int i;
 279
 280         s->fc = NULL;
 281         if (!nf)
 282                 return;
 283         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 284         s->fc = para_calloc(sizeof(struct filter_chain));
 285         INIT_LIST_HEAD(&s->fc->filters);
 286         s->fc->inbuf = s->receiver_node->buf;
 287         s->fc->in_loaded = &s->receiver_node->loaded;
 288         s->fc->input_eof = &s->receiver_node->eof;
 289         s->fc->task.pre_select = filter_pre_select;
 290         s->fc->task.event_handler = filter_event_handler;
 291         s->fc->task.private_data = s->fc;
 292         s->fc->eof = 0;
 293
 294         s->receiver_node->output_eof = &s->fc->eof;
 295         sprintf(s->fc->task.status, "filter chain");
 296         for (i = 0; i < nf; i++) {
 297                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 298                 fn->conf = a->filter_conf[i];
 299                 fn->fc = s->fc;
 300                 fn->filter = a->filters[i];
 301                 INIT_LIST_HEAD(&fn->callbacks);
 302                 list_add_tail(&fn->node, &s->fc->filters);
 303                 fn->filter->open(fn);
 304                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 305                         audio_formats[s->format], i + 1,  nf,
 306                         fn->filter->name, slot_num);
 307                 s->fc->outbuf = fn->buf;
 308                 s->fc->out_loaded = &fn->loaded;
 309         }
 310         register_task(&s->fc->task);
 311 }
 312
 313 static void wng_event_handler(struct task *t)
 314 {
 315         struct writer_node_group *wng = t->private_data;
 316
 317         PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
 318         wng->eof = 1;
 319         wng_unregister(wng);
 320 }
 321
 322 static void open_writers(int slot_num)
 323 {
 324         int ret, i;
 325         struct slot_info *s = &slot[slot_num];
 326         struct audio_format_info *a = &afi[s->format];
 327
 328         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 329         if (!a->num_writers)
 330                 s->wng = setup_default_wng();
 331         else
 332                 s->wng = wng_new(a->num_writers);
 333         if (s->fc) {
 334                 s->wng->buf = s->fc->outbuf;
 335                 s->wng->loaded = s->fc->out_loaded;
 336                 s->wng->input_eof = &s->fc->eof;
 337                 s->wng->channels = &s->fc->channels;
 338                 s->wng->samplerate = &s->fc->samplerate;
 339                 s->fc->output_eof = &s->wng->eof;
 340                 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
 341         } else {
 342                 s->wng->buf = s->receiver_node->buf;
 343                 s->wng->loaded = &s->receiver_node->loaded;
 344                 s->wng->input_eof = &s->receiver_node->eof;
 345         }
 346         s->wng->task.event_handler = wng_event_handler;
 347         for (i = 0; i < a->num_writers; i++) {
 348                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 349                 s->wng->writer_nodes[i].writer = a->writers[i];
 350         }
 351         ret = wng_open(s->wng);
 352         if (ret < 0) {
 353                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 354                 return;
 355         }
 356         s->wstime = *now;
 357         activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
 358 }
 359
 360 static void rn_event_handler(struct task *t)
 361 {
 362         struct receiver_node *rn = t->private_data;
 363         const struct timeval restart_delay = {0, 10 * 1000};
 364         int i;
 365
 366         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 367         unregister_task(t);
 368         rn->eof = 1;
 369         /* set restart barrier */
 370         FOR_EACH_SLOT(i) {
 371                 if (slot[i].receiver_node != rn)
 372                         continue;
 373                 tv_add(now, &restart_delay, &afi[slot[i].format].restart_barrier);
 374         }
 375 }
 376
 377 static int open_receiver(int format)
 378 {
 379         struct audio_format_info *a = &afi[format];
 380         struct slot_info *s;
 381         int ret, slot_num;
 382         struct receiver_node *rn;
 383         const struct timeval restart_delay = {1, 0};
 384
 385         ret = get_empty_slot();
 386         if (ret < 0)
 387                 goto err;
 388         slot_num = ret;
 389         s = &slot[slot_num];
 390         s->format = format;
 391         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 392         rn = s->receiver_node;
 393         rn->receiver = a->receiver;
 394         rn->conf = a->receiver_conf;
 395         ret = a->receiver->open(s->receiver_node);
 396         if (ret < 0) {
 397                 free(s->receiver_node);
 398                 s->receiver_node = NULL;
 399                 goto err;
 400         }
 401         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 402                 audio_formats[s->format], a->receiver->name, slot_num);
 403         rn->task.private_data = s->receiver_node;
 404         rn->task.pre_select = a->receiver->pre_select;
 405         rn->task.post_select = a->receiver->post_select;
 406         rn->task.event_handler = rn_event_handler;
 407         sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
 408         register_task(&rn->task);
 409         return 1;
 410 err:
 411         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 412         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 413         return ret;
 414 }
 415
 416 static int receiver_running(int format)
 417 {
 418         int i;
 419
 420         FOR_EACH_SLOT(i) {
 421                 struct slot_info *s = &slot[i];
 422                 if (s->format == format && s->receiver_node
 423                                 && !s->receiver_node->eof)
 424                         return 1;
 425         }
 426         return 0;
 427 }
 428
 429 static int open_current_receiver(struct sched *s)
 430 {
 431         int i;
 432         struct timeval diff;
 433         char *audio_format = stat_task->stat_item_values[SI_FORMAT];
 434
 435         if (!audio_format || !stat_task->pcd)
 436                 return 0;
 437         i = get_audio_format_num(audio_format + strlen(
 438                 status_item_list[SI_FORMAT]) + 1);
 439         if (i < 0)
 440                 return 0;
 441         if (receiver_running(i))
 442                 return 0;
 443         if (tv_diff(now, &afi[i].restart_barrier, &diff) < 0) {
 444                 s->timeout = diff;
 445                 return 0;
 446         }
 447         return open_receiver(i) < 0? 0 : 1;
 448 }
 449
 450 static unsigned compute_time_diff(const struct timeval *status_time)
 451 {
 452         struct timeval tmp, diff;
 453         static unsigned count;
 454         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 455         const struct timeval max_deviation = {0, 500 * 1000};
 456         const int time_smooth = 5;
 457
 458         if (!status_time)
 459                 return count;
 460         sign = tv_diff(status_time, now, &diff);
 461 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 462 //                      sign, sa_time_diff_sign);
 463         if (!count) {
 464                 sa_time_diff_sign = sign;
 465                 stat_task->sa_time_diff = diff;
 466                 count++;
 467                 goto out;
 468         }
 469         if (count > 5) {
 470                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 471                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 472                         PARA_WARNING_LOG("time diff jump: %lims\n",
 473                                 s * tv2ms(&tmp));
 474         }
 475         count++;
 476         sa_time_diff_sign = tv_convex_combination(
 477                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 478                 count > 10? sign : sign * time_smooth, &diff,
 479                 &tmp);
 480         stat_task->sa_time_diff = tmp;
 481         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 482                 sign > 0? "+" : "-",
 483                 tv2ms(&diff),
 484                 sa_time_diff_sign ? "+" : "-",
 485                 tv2ms(&stat_task->sa_time_diff)
 486         );
 487 out:
 488         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 489         return count;
 490 }
 491
 492 static int check_stat_line(char *line, __a_unused void *data)
 493 {
 494         int itemnum;
 495         size_t ilen = 0;
 496         long unsigned sec, usec;
 497         char *tmp;
 498
 499 //      PARA_INFO_LOG("line: %s\n", line);
 500         if (!line)
 501                 return 1;
 502         itemnum = stat_line_valid(line);
 503         if (itemnum < 0) {
 504                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 505                 return 1;
 506         }
 507         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 508                 return 1;
 509         tmp = make_message("%s\n", line);
 510         stat_client_write(tmp, itemnum);
 511         free(tmp);
 512         free(stat_task->stat_item_values[itemnum]);
 513         stat_task->stat_item_values[itemnum] = para_strdup(line);
 514         ilen = strlen(status_item_list[itemnum]);
 515         switch (itemnum) {
 516         case SI_STATUS:
 517                 stat_task->playing = strstr(line, "playing")? 1 : 0;
 518                 break;
 519         case SI_OFFSET:
 520                 stat_task->offset_seconds = atoi(line + ilen + 1);
 521                 break;
 522         case SI_SECONDS_TOTAL:
 523                 stat_task->length_seconds = atoi(line + ilen + 1);
 524                 break;
 525         case SI_STREAM_START:
 526                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 527                         struct timeval a_start, delay;
 528                         delay.tv_sec = conf.stream_delay_arg / 1000;
 529                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 530                         stat_task->server_stream_start.tv_sec = sec;
 531                         stat_task->server_stream_start.tv_usec = usec;
 532                         if (compute_time_diff(NULL) > 2) {
 533                                 if (stat_task->sa_time_diff_sign < 0)
 534                                         tv_add(&stat_task->server_stream_start,
 535                                                 &stat_task->sa_time_diff, &a_start);
 536                                 else
 537                                         tv_diff(&stat_task->server_stream_start,
 538                                                 &stat_task->sa_time_diff, &a_start);
 539                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 540                         }
 541                 }
 542                 break;
 543         case SI_CURRENT_TIME:
 544                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 545                         struct timeval tv = {sec, usec};
 546                         compute_time_diff(&tv);
 547                 }
 548                 if (stat_task->clock_diff_count)
 549                         stat_task->clock_diff_count--;
 550                 break;
 551         }
 552         return 1;
 553 }
 554
 555 static void try_to_close_slot(int slot_num)
 556 {
 557         struct slot_info *s = &slot[slot_num];
 558
 559         if (s->format < 0)
 560                 return;
 561         if (s->receiver_node && !s->receiver_node->eof)
 562                 return;
 563         if (s->fc && !s->fc->eof)
 564                 return;
 565         if (s->wng && !s->wng->eof)
 566                 return;
 567         PARA_INFO_LOG("closing slot %d \n", slot_num);
 568         wng_close(s->wng);
 569         close_filters(s->fc);
 570         free(s->fc);
 571         close_receiver(slot_num);
 572         clear_slot(slot_num);
 573 }
 574
 575 /*
 576  * Check if any receivers/filters/writers need to be started and do so if
 577  * necessary.  Since the pre_select function didn't have a chance yet to put
 578  * file descriptors into the fd sets given by s, make the upcoming select()
 579  * return immediately to avoid a long timeout in case we started something.
 580  */
 581 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
 582 {
 583         int i;
 584         struct timeval min_delay = {0, 1};
 585
 586         t->ret = 1;
 587         if (audiod_status != AUDIOD_ON || !stat_task->playing)
 588                 return kill_all_decoders();
 589         if (open_current_receiver(s))
 590                 s->timeout = min_delay;
 591         FOR_EACH_SLOT(i) {
 592                 struct slot_info *sl = &slot[i];
 593                 struct audio_format_info *a;
 594                 struct timeval diff;
 595
 596                 if (sl->format < 0)
 597                         continue;
 598                 a = &afi[sl->format];
 599                 if (!sl->receiver_node)
 600                         continue;
 601                 if (!a->num_filters) {
 602                         if (sl->receiver_node->loaded && !sl->wng) {
 603                                 open_writers(i);
 604                                 s->timeout = min_delay;
 605                         }
 606                         continue;
 607                 }
 608                 if (sl->receiver_node->loaded && !sl->fc) {
 609                         open_filters(i);
 610                         s->timeout = min_delay;
 611                         continue;
 612                 }
 613                 if (!sl->fc || !*sl->fc->out_loaded || sl->wng)
 614                         continue;
 615                 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
 616                         open_writers(i);
 617                         s->timeout = min_delay;
 618                         continue;
 619                 }
 620                 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
 621                 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
 622                         s->timeout = diff;
 623                 }
 624         }
 625 }
 626
 627 static void audiod_post_select(__a_unused struct sched *s,
 628         __a_unused struct task *t)
 629 {
 630         int i;
 631
 632         t->ret = 1;
 633         FOR_EACH_SLOT(i)
 634                 try_to_close_slot(i);
 635 }
 636
 637 static void init_audiod_task(struct task *t)
 638 {
 639         t->pre_select = audiod_pre_select;
 640         t->post_select = audiod_post_select;
 641         t->event_handler = NULL;
 642         t->private_data = t;
 643         sprintf(t->status, "audiod task");
 644 }
 645
 646 static int parse_stream_command(const char *txt, char **cmd)
 647 {
 648         char *p = strchr(txt, ':');
 649         int i;
 650
 651         if (!p)
 652                 return -E_MISSING_COLON;
 653         p++;
 654         FOR_EACH_AUDIO_FORMAT(i) {
 655                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 656                         continue;
 657                 *cmd = p;
 658                 return i;
 659         }
 660         return -E_UNSUPPORTED_AUDIO_FORMAT;
 661 }
 662
 663 static int add_filter(int format, char *cmdline)
 664 {
 665         struct audio_format_info *a = &afi[format];
 666         int filter_num, nf = a->num_filters;
 667
 668         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 669         if (filter_num < 0)
 670                 return filter_num;
 671         a->filters[nf] = &filters[filter_num];
 672         a->num_filters++;
 673         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
 674                 a->filters[nf]->name);
 675         return filter_num;
 676 }
 677
 678 static int init_writers(void)
 679 {
 680         int i, ret, nw;
 681         char *cmd;
 682         struct audio_format_info *a;
 683
 684         init_supported_writers();
 685         nw = PARA_MAX(1, conf.writer_given);
 686         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 687         FOR_EACH_AUDIO_FORMAT(i) {
 688                 a = &afi[i];
 689                 a->writer_conf = para_malloc(nw * sizeof(void *));
 690                 a->writers = para_malloc(nw * sizeof(struct writer *));
 691                 a->num_writers = 0;
 692         }
 693         for (i = 0; i < conf.writer_given; i++) {
 694                 void *wconf;
 695                 int writer_num;
 696                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 697                 if (ret < 0)
 698                         goto out;
 699                 a = &afi[ret];
 700                 nw = a->num_writers;
 701                 wconf = check_writer_arg(cmd, &writer_num);
 702                 if (!wconf) {
 703                         ret = writer_num;
 704                         goto out;
 705                 }
 706                 a->writers[nw] = &writers[writer_num];
 707                 a->writer_conf[nw] = wconf;
 708                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 709                         nw, writer_names[writer_num]);
 710                 a->num_writers++;
 711         }
 712         ret = 1;
 713 out:
 714         return ret;
 715 }
 716
 717 static int init_receivers(void)
 718 {
 719         int i, ret, receiver_num;
 720         char *cmd = NULL;
 721         struct audio_format_info *a;
 722
 723         for (i = 0; receivers[i].name; i++) {
 724                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
 725                 receivers[i].init(&receivers[i]);
 726         }
 727         for (i = conf.receiver_given - 1; i >= 0; i--) {
 728                 char *arg = conf.receiver_arg[i];
 729                 char *recv_arg = strchr(arg, ':');
 730                 ret = -E_MISSING_COLON;
 731                 if (!recv_arg)
 732                         goto out;
 733                 *recv_arg = '\0';
 734                 recv_arg++;
 735                 ret = get_audio_format_num(arg);
 736                 if (ret < 0)
 737                         goto out;
 738                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 739                 if (!afi[ret].receiver_conf) {
 740                         ret = -E_RECV_SYNTAX;
 741                         goto out;
 742                 }
 743                 afi[ret].receiver = &receivers[receiver_num];
 744         }
 745         /* use the first available receiver with no arguments
 746          * for those audio formats for which no receiver
 747          * was specified
 748          */
 749         cmd = para_strdup(receivers[0].name);
 750         FOR_EACH_AUDIO_FORMAT(i) {
 751                 a = &afi[i];
 752                 if (a->receiver_conf)
 753                         continue;
 754                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 755                 if (!a->receiver_conf)
 756                         return -E_RECV_SYNTAX;
 757                 a->receiver = &receivers[receiver_num];
 758         }
 759         ret = 1;
 760 out:
 761         free(cmd);
 762         return ret;
 763 }
 764
 765 static int init_default_filters(void)
 766 {
 767         int i, ret = 1;
 768
 769         FOR_EACH_AUDIO_FORMAT(i) {
 770                 struct audio_format_info *a = &afi[i];
 771                 char *tmp;
 772                 int j;
 773
 774                 if (a->num_filters)
 775                         continue; /* no default -- nothing to to */
 776                 /* add "dec" to audio format name */
 777                 tmp = make_message("%sdec", audio_formats[i]);
 778                 for (j = 0; filters[j].name; j++)
 779                         if (!strcmp(tmp, filters[j].name))
 780                                 break;
 781                 free(tmp);
 782                 ret = -E_UNSUPPORTED_FILTER;
 783                 if (!filters[j].name)
 784                         goto out;
 785                 tmp = para_strdup(filters[j].name);
 786                 ret = add_filter(i, tmp);
 787                 free(tmp);
 788                 if (ret < 0)
 789                         goto out;
 790                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 791                         filters[j].name);
 792         }
 793 out:
 794         return ret;
 795 }
 796
 797 static int init_filters(void)
 798 {
 799         int i, ret, nf;
 800
 801         filter_init(filters);
 802         nf = PARA_MAX(1,  conf.filter_given);
 803         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 804         FOR_EACH_AUDIO_FORMAT(i) {
 805                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 806                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
 807         }
 808         if (!conf.no_default_filters_given)
 809                 return init_default_filters();
 810         for (i = 0; i < conf.filter_given; i++) {
 811                 char *arg = conf.filter_arg[i];
 812                 char *filter_name = strchr(arg, ':');
 813                 ret = -E_MISSING_COLON;
 814                 if (!filter_name)
 815                         goto out;
 816                 *filter_name = '\0';
 817                 filter_name++;
 818                 ret = get_audio_format_num(arg);
 819                 if (ret < 0)
 820                         goto out;
 821                 ret = add_filter(ret, filter_name);
 822                 if (ret < 0)
 823                         goto out;
 824         }
 825         ret = init_default_filters(); /* use default values for the rest */
 826 out:
 827         return ret;
 828 }
 829
 830 static int init_stream_io(void)
 831 {
 832         int ret;
 833
 834         ret = init_writers();
 835         if (ret < 0)
 836                 return ret;
 837         ret = init_receivers();
 838         if (ret < 0)
 839                 return ret;
 840         ret = init_filters();
 841         if (ret < 0)
 842                 return ret;
 843         return 1;
 844 }
 845
 846 static int audiod_get_socket(void)
 847 {
 848         struct sockaddr_un unix_addr;
 849         int fd;
 850
 851         if (conf.socket_given)
 852                 socket_name = para_strdup(conf.socket_arg);
 853         else {
 854                 char *hn = para_hostname();
 855                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 856                         hn);
 857                 free(hn);
 858         }
 859         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 860         if (conf.force_given)
 861                 unlink(socket_name);
 862         fd = create_local_socket(socket_name, &unix_addr,
 863                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 864         if (fd < 0) {
 865                 PARA_EMERG_LOG("can not connect to socket\n");
 866                 exit(EXIT_FAILURE); /* do not unlink socket */
 867         }
 868         if (listen(fd , 5) < 0) {
 869                 PARA_EMERG_LOG("can not listen on socket\n");
 870                 exit(EXIT_FAILURE); /* do not unlink socket */
 871         }
 872         mark_fd_nonblocking(fd);
 873         return fd;
 874 }
 875
 876 static void signal_event_handler(struct task *t)
 877 {
 878         struct signal_task *st = t->private_data;
 879
 880         switch (st->signum) {
 881         case SIGINT:
 882         case SIGTERM:
 883         case SIGHUP:
 884                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 885                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 886         }
 887 }
 888
 889 static void signal_pre_select(struct sched *s, struct task *t)
 890 {
 891         struct signal_task *st = t->private_data;
 892         t->ret = 1;
 893         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 894 }
 895
 896 static void signal_post_select(struct sched *s, struct task *t)
 897 {
 898         struct signal_task *st = t->private_data;
 899         t->ret = 1;
 900         if (!FD_ISSET(st->fd, &s->rfds))
 901                 return;
 902         t->ret = -E_SIGNAL_CAUGHT;
 903         st->signum = para_next_signal();
 904 }
 905
 906 static void signal_setup_default(struct signal_task *st)
 907 {
 908         st->task.pre_select = signal_pre_select;
 909         st->task.post_select = signal_post_select;
 910         st->task.private_data = st;
 911         sprintf(st->task.status, "signal task");
 912 }
 913
 914 static void command_pre_select(struct sched *s, struct task *t)
 915 {
 916         struct command_task *ct = t->private_data;
 917         t->ret = 1;
 918         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 919
 920 }
 921
 922 static void command_post_select(struct sched *s, struct task *t)
 923 {
 924         int ret;
 925         struct command_task *ct = t->private_data;
 926
 927         t->ret = 1; /* always successful */
 928         audiod_status_dump();
 929         if (!FD_ISSET(ct->fd, &s->rfds))
 930                 return;
 931         ret = handle_connect(ct->fd);
 932         if (ret < 0)
 933                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 934 }
 935
 936 static void init_command_task(struct command_task *ct)
 937 {
 938         ct->task.pre_select = command_pre_select;
 939         ct->task.post_select = command_post_select;
 940         ct->task.event_handler = NULL;
 941         ct->task.private_data = ct;
 942         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 943         sprintf(ct->task.status, "command task");
 944 }
 945
 946 static void close_stat_pipe(void)
 947 {
 948         int i;
 949
 950         if (!stat_task->pcd)
 951                 return;
 952         client_close(stat_task->pcd);
 953         stat_task->pcd = NULL;
 954         FOR_EACH_STATUS_ITEM(i) {
 955                 free(stat_task->stat_item_values[i]);
 956                 stat_task->stat_item_values[i] = NULL;
 957         }
 958         dump_empty_status();
 959         stat_task->length_seconds = 0;
 960         stat_task->offset_seconds = 0;
 961         audiod_status_dump();
 962         stat_task->playing = 0;
 963         stat_task->stat_item_values[SI_BASENAME] = make_message(
 964                 "%s: no connection to para_server\n",
 965                 status_item_list[SI_BASENAME]);
 966         stat_client_write(stat_task->stat_item_values[SI_BASENAME],
 967                 SI_BASENAME);
 968         if (stat_task->clock_diff_count) {
 969                 stat_task->clock_diff_barrier.tv_sec = now->tv_sec + 1;
 970                 stat_task->clock_diff_barrier.tv_usec = now->tv_usec;
 971         }
 972 }
 973
 974 /**
 975  * close the connection to para_server and exit
 976  *
 977  * \param status the exit status which is passed to exit(3)
 978  * \param msg the log message
 979  *
 980  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
 981  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
 982  * EXIT_FAILURE.
 983  *
 984  * \sa exit(3)
 985  */
 986 void __noreturn clean_exit(int status, const char *msg)
 987 {
 988         PARA_EMERG_LOG("%s\n", msg);
 989         if (socket_name)
 990                 unlink(socket_name);
 991         close_stat_pipe();
 992         exit(status);
 993 }
 994
 995 /* avoid busy loop if server is down */
 996 static void set_stat_task_restart_barrier(void)
 997 {
 998         struct timeval delay = {5, 0};
 999         tv_add(now, &delay, &stat_task->restart_barrier);
1000 }
1001
1002 static void client_task_event_handler(__a_unused struct task *t)
1003 {
1004         int i;
1005
1006         if (t->ret == -E_HANDSHAKE_COMPLETE)
1007                 return;
1008         unregister_task(t);
1009         close_stat_pipe();
1010         if (t->ret != -E_SERVER_EOF)
1011                 stat_task->clock_diff_count = conf.clock_diff_count_arg;
1012         set_stat_task_restart_barrier();
1013         FOR_EACH_AUDIO_FORMAT(i)
1014                 afi[i].restart_barrier = stat_task->restart_barrier;
1015 }
1016
1017 static void status_pre_select(struct sched *s, struct task *t)
1018 {
1019         struct status_task *st = t->private_data;
1020         int ret;
1021
1022         t->ret = 1; /* always successful */
1023         if (st->pcd || audiod_status == AUDIOD_OFF)
1024                 return;
1025         if (!st->clock_diff_count && tv_diff(now, &st->restart_barrier, NULL)
1026                         < 0)
1027                 return;
1028         if (st->clock_diff_count) {
1029                 char *argv[] = {"audiod", "stat", "1", NULL};
1030                 int argc = 3;
1031                 if (tv_diff(now, &st->clock_diff_barrier, NULL) < 0)
1032                         return;
1033                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1034                 ret = client_open(argc, argv, &st->pcd);
1035
1036         } else {
1037                 char *argv[] = {"audiod", "stat", NULL};
1038                 int argc = 2;
1039                 ret = client_open(argc, argv, &st->pcd);
1040         }
1041         set_stat_task_restart_barrier();
1042         if (ret < 0)
1043                 return;
1044         st->pcd->task.event_handler = client_task_event_handler;
1045         s->timeout.tv_sec = 0;
1046         s->timeout.tv_usec = 1;
1047 }
1048
1049 static void status_post_select(__a_unused struct sched *s, struct task *t)
1050 {
1051         struct status_task *st = t->private_data;
1052         unsigned bytes_left;
1053
1054         t->ret = 1;
1055         if (!st->pcd || st->pcd->status != CL_RECEIVING)
1056                 return;
1057         if (st->pcd && audiod_status == AUDIOD_OFF) {
1058                 unregister_task(&st->pcd->task);
1059                 close_stat_pipe();
1060                 st->clock_diff_count = conf.clock_diff_count_arg;
1061                 return;
1062         }
1063         bytes_left = for_each_line(st->pcd->buf, st->pcd->loaded,
1064                 &check_stat_line, NULL);
1065         if (st->pcd->loaded != bytes_left) {
1066                 st->last_status_read = *now;
1067                 st->pcd->loaded = bytes_left;
1068         } else {
1069                 struct timeval diff;
1070                 tv_diff(now, &st->last_status_read, &diff);
1071                 if (diff.tv_sec > 61)
1072                         close_stat_pipe();
1073         }
1074 }
1075
1076 static void init_status_task(struct status_task *st)
1077 {
1078         memset(st, 0, sizeof(struct status_task));
1079         st->task.pre_select = status_pre_select;
1080         st->task.post_select = status_post_select;
1081         st->task.private_data = st;
1082         st->sa_time_diff_sign = 1;
1083         st->clock_diff_count = conf.clock_diff_count_arg;
1084         sprintf(st->task.status, "status task");
1085 }
1086
1087 static void set_initial_status(void)
1088 {
1089         audiod_status = AUDIOD_ON;
1090         if (!conf.mode_given)
1091                 return;
1092         if (!strcmp(conf.mode_arg, "sb")) {
1093                 audiod_status = AUDIOD_STANDBY;
1094                 return;
1095         }
1096         if (!strcmp(conf.mode_arg, "off")) {
1097                 audiod_status = AUDIOD_OFF;
1098                 return;
1099         }
1100         if (strcmp(conf.mode_arg, "on"))
1101                 PARA_WARNING_LOG("%s", "invalid mode\n");
1102 }
1103
1104 /**
1105  * the main function of para_audiod
1106  *
1107  * \param argc usual argument count
1108  * \param argv usual argument vector
1109  *
1110  * \return EXIT_SUCCESS or EXIT_FAILURE
1111  *
1112  * \sa para_audiod(1)
1113  * */
1114 int main(int argc, char *argv[])
1115 {
1116         char *config_file;
1117         int ret, i;
1118         struct sched s;
1119         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1120         struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1121
1122         valid_fd_012();
1123         audiod_cmdline_parser(argc, argv, &conf);
1124         HANDLE_VERSION_FLAG("audiod", conf);
1125         para_drop_privileges(conf.user_arg, conf.group_arg);
1126         config_file = configfile_exists();
1127         if (config_file) {
1128                 struct audiod_cmdline_parser_params params = {
1129                         .override = 0,
1130                         .initialize = 0,
1131                         .check_required = 0,
1132                         .check_ambiguity = 0
1133
1134                 };
1135                 if (audiod_cmdline_parser_config_file(config_file, &conf, &params)) {
1136                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1137                         exit(EXIT_FAILURE);
1138                 }
1139                 free(config_file);
1140         }
1141         if (conf.logfile_given)
1142                 logfile = open_log(conf.logfile_arg);
1143         log_welcome("para_audiod", conf.loglevel_arg);
1144         i = init_stream_io();
1145         if (i < 0) {
1146                 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1147                 exit(EXIT_FAILURE);
1148         }
1149         server_uptime(UPTIME_SET);
1150         set_initial_status();
1151         FOR_EACH_SLOT(i)
1152                 clear_slot(i);
1153         init_grabbing();
1154         setup_signal_handling();
1155         signal_setup_default(sig_task);
1156         sig_task->task.event_handler = signal_event_handler;
1157
1158         init_status_task(stat_task);
1159         init_command_task(cmd_task);
1160         init_audiod_task(audiod_task);
1161
1162         if (conf.daemon_given)
1163                 daemon_init();
1164
1165         register_task(&sig_task->task);
1166         register_task(&cmd_task->task);
1167         register_task(&stat_task->task);
1168         register_task(audiod_task);
1169         s.default_timeout.tv_sec = 0;
1170         s.default_timeout.tv_usec = 99 * 1000;
1171         ret = schedule(&s);
1172
1173         PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1174         return EXIT_FAILURE;
1175 }