audiod.c

   1 /*
   2  * Copyright (C) 2005-2007 Andre Noll <maan@systemlinux.org>
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     This program is distributed in the hope that it will be useful,
  10  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *     GNU General Public License for more details.
  13  *
  14  *     You should have received a copy of the GNU General Public License
  15  *     along with this program; if not, write to the Free Software
  16  *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  17  */
  18
  19 /** \file audiod.c the paraslash's audio daemon */
  20
  21 #include "para.h"
  22
  23 #include "audiod.cmdline.h"
  24 #include "list.h"
  25 #include "sched.h"
  26 #include "recv.h"
  27 #include "filter.h"
  28 #include "grab_client.cmdline.h"
  29 #include "grab_client.h"
  30 #include "client.cmdline.h"
  31 #include "client.h"
  32 #include "audiod.h"
  33 #include "net.h"
  34 #include "daemon.h"
  35 #include "string.h"
  36 #include "fd.h"
  37 #include "write.h"
  38 #include "write_common.h"
  39 #include "error.h"
  40 #include "signal.h"
  41
  42 /** define the array of error lists needed by para_audiod */
  43 INIT_AUDIOD_ERRLISTS;
  44 /** define the array containing all supported audio formats */
  45 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
  46
  47 /** defines how to handle one supported audio format */
  48 struct audio_format_info {
  49         /** pointer to the receiver for this audio format */
  50         struct receiver *receiver;
  51         /** the receiver configuration */
  52         void *receiver_conf;
  53         /** the number of filters that should be activated for this audio format */
  54         unsigned int num_filters;
  55         /** pointer to the array of filters to be activated */
  56         struct filter **filters;
  57         /** pointer to the array of filter configurations */
  58         void **filter_conf;
  59         /** the number of filters that should be activated for this audio format */
  60         unsigned int num_writers;
  61         /** pointer to the array of writers to be activated */
  62         struct writer **writers;
  63         /** pointer to the array of writer configurations */
  64         void **writer_conf;
  65         /** do not start receiver/filters/writer before this time */
  66         struct timeval restart_barrier;
  67 };
  68
  69 /**
  70  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  71  * be associated with a receiver/filter/writer triple. This array holds all
  72  * information on the status of these slots.
  73  *
  74  * \sa struct slot_info
  75  * */
  76 struct slot_info slot[MAX_STREAM_SLOTS];
  77
  78
  79 /**
  80  * the current mode of operation of which can be changed by the on/off/cycle
  81  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
  82  */
  83 int audiod_status = AUDIOD_ON;
  84
  85 /**
  86  * the gengetopt args_info struct that holds information on all command line
  87  * arguments
  88  */
  89 struct audiod_args_info conf;
  90
  91 static char *socket_name;
  92 static FILE *logfile;
  93 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
  94
  95 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
  96
  97 static struct status_task status_task_struct;
  98
  99 /**
 100  * the task that calls the status command of para_server
 101  *
 102  * \sa struct status_task
 103  */
 104 struct status_task *stat_task = &status_task_struct;
 105 static struct timeval initial_delay_barrier;
 106
 107 /**
 108  * the task for handling audiod commands
 109  *
 110  * \sa struct task, struct sched
 111  */
 112 struct command_task {
 113         /** the local listening socket */
 114         int fd;
 115         /** the associated task structure */
 116         struct task task;
 117 };
 118
 119 /**
 120  * task for signal handling
 121  */
 122 struct signal_task {
 123         /** the signal pipe */
 124         int fd;
 125         /** the number of the most recent signal */
 126         int signum;
 127         /** the associated task structure */
 128         struct task task;
 129 };
 130
 131 /** iterate over all supported audio formats */
 132 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 133
 134 /**
 135  * get the audio format number
 136  * \param name the name of the audio format
 137  *
 138  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 139  * \a name is not a supported audio format.
 140  */
 141 int get_audio_format_num(char *name)
 142 {
 143         int i;
 144         FOR_EACH_AUDIO_FORMAT(i)
 145                 if (!strcmp(name, audio_formats[i]))
 146                         return i;
 147         return -E_UNSUPPORTED_AUDIO_FORMAT;
 148 }
 149
 150 /**
 151  * the log function of para_audiod
 152  *
 153  * \param ll loglevel
 154  * \param fmt the format string
 155  */
 156 void para_log(int ll, const char* fmt,...)
 157 {
 158         va_list argp;
 159         FILE *outfd;
 160         struct tm *tm;
 161         time_t t1;
 162         char str[MAXLINE] = "";
 163         static char *hostname;
 164
 165         if (ll < conf.loglevel_arg)
 166                 return;
 167         if (!hostname)
 168                 hostname = para_hostname();
 169         outfd = logfile? logfile : stderr;
 170         time(&t1);
 171         tm = localtime(&t1);
 172         strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
 173         fprintf(outfd, "%s %s ", str, hostname);
 174         if (conf.loglevel_arg <= INFO)
 175                 fprintf(outfd, "%i ", ll);
 176         va_start(argp, fmt);
 177         vfprintf(outfd, fmt, argp);
 178         va_end(argp);
 179 }
 180
 181 static char *configfile_exists(void)
 182 {
 183         static char *config_file;
 184
 185         if (!config_file) {
 186                 char *home = para_homedir();
 187                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 188                 free(home);
 189         }
 190         return file_exists(config_file)? config_file : NULL;
 191 }
 192
 193 static void setup_signal_handling(void)
 194 {
 195         sig_task->fd = para_signal_init();
 196         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 197         para_install_sighandler(SIGINT);
 198         para_install_sighandler(SIGTERM);
 199         para_install_sighandler(SIGHUP);
 200         signal(SIGPIPE, SIG_IGN);
 201 }
 202
 203 static void clear_slot(int slot_num)
 204 {
 205         struct slot_info *s = &slot[slot_num];
 206
 207         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 208         memset(s, 0, sizeof(struct slot_info));
 209         s->format = -1;
 210 }
 211
 212 static void close_receiver(int slot_num)
 213 {
 214         struct slot_info *s = &slot[slot_num];
 215         struct audio_format_info *a;
 216
 217         if (s->format < 0 || !s->receiver_node)
 218                 return;
 219         a = &afi[s->format];
 220         PARA_NOTICE_LOG("closing %s receiver in slot %d (eof = %d)\n",
 221                 audio_formats[s->format] , slot_num, s->receiver_node->eof);
 222         a->receiver->close(s->receiver_node);
 223         free(s->receiver_node);
 224         s->receiver_node = NULL;
 225 }
 226
 227 static void kill_all_decoders(void)
 228 {
 229         int i;
 230
 231         FOR_EACH_SLOT(i) {
 232                 struct slot_info *s = &slot[i];
 233                 if (s->wng && !s->wng->eof) {
 234                         PARA_INFO_LOG("unregistering writer node group in slot %d\n",
 235                                 i);
 236                         wng_unregister(s->wng);
 237                         s->wng->eof = 1;
 238                 }
 239                 if (s->fc && !s->fc->eof) {
 240                         PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
 241                         unregister_task(&s->fc->task);
 242                         s->fc->eof = 1;
 243                 }
 244                 if (s->receiver_node && !s->receiver_node->eof) {
 245                         PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
 246                         unregister_task(&s->receiver_node->task);
 247                         s->receiver_node->eof = 1;
 248                 }
 249         }
 250 }
 251
 252 static int get_empty_slot(void)
 253 {
 254         int i;
 255         struct slot_info *s;
 256
 257         FOR_EACH_SLOT(i) {
 258                 s = &slot[i];
 259                 if (s->format < 0) {
 260                         clear_slot(i);
 261                         return i;
 262                 }
 263                 if (s->wng || s->receiver_node || s->fc)
 264                         continue;
 265                 clear_slot(i);
 266                 return i;
 267         }
 268         return -E_NO_MORE_SLOTS;
 269 }
 270
 271 /**
 272  * get the number of filters
 273  *
 274  * \param audio_format_num the number identifying the audio format
 275  *
 276  * \return the number of filters for the given audio format
 277  *
 278  * \sa struct filter;
 279  */
 280 int num_filters(int audio_format_num)
 281 {
 282         return afi[audio_format_num].num_filters;
 283 }
 284
 285 static void filter_event_handler(struct task *t)
 286 {
 287         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 288         struct filter_chain *fc = t->private_data;
 289         fc->eof = 1;
 290         unregister_task(t);
 291 }
 292
 293 static void open_filters(int slot_num)
 294 {
 295         struct slot_info *s = &slot[slot_num];
 296         struct audio_format_info *a = &afi[s->format];
 297         int nf = a->num_filters;
 298         int i;
 299
 300         s->fc = NULL;
 301         if (!nf)
 302                 return;
 303         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 304         s->fc = para_calloc(sizeof(struct filter_chain));
 305         INIT_LIST_HEAD(&s->fc->filters);
 306         s->fc->inbuf = s->receiver_node->buf;
 307         s->fc->in_loaded = &s->receiver_node->loaded;
 308         s->fc->input_eof = &s->receiver_node->eof;
 309         s->fc->task.pre_select = filter_pre_select;
 310         s->fc->task.event_handler = filter_event_handler;
 311         s->fc->task.private_data = s->fc;
 312         s->fc->eof = 0;
 313
 314         s->receiver_node->output_eof = &s->fc->eof;
 315         sprintf(s->fc->task.status, "filter chain");
 316         for (i = 0; i < nf; i++) {
 317                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 318                 fn->conf = a->filter_conf[i];
 319                 fn->fc = s->fc;
 320                 fn->filter = a->filters[i];
 321                 INIT_LIST_HEAD(&fn->callbacks);
 322                 list_add_tail(&fn->node, &s->fc->filters);
 323                 fn->filter->open(fn);
 324                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 325                         audio_formats[s->format], i + 1,  nf,
 326                         fn->filter->name, slot_num);
 327                 s->fc->outbuf = fn->buf;
 328                 s->fc->out_loaded = &fn->loaded;
 329         }
 330         register_task(&s->fc->task);
 331 }
 332
 333 static void wng_event_handler(struct task *t)
 334 {
 335         struct writer_node_group *wng = t->private_data;
 336
 337         PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
 338         wng->eof = 1;
 339         wng_unregister(wng);
 340 }
 341
 342 static void open_writers(int slot_num)
 343 {
 344         int ret, i;
 345         struct slot_info *s = &slot[slot_num];
 346         struct audio_format_info *a = &afi[s->format];
 347
 348         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 349         if (!a->num_writers)
 350                 s->wng = setup_default_wng();
 351         else
 352                 s->wng = wng_new(a->num_writers);
 353         if (s->fc) {
 354                 s->wng->buf = s->fc->outbuf;
 355                 s->wng->loaded = s->fc->out_loaded;
 356                 s->wng->input_eof = &s->fc->eof;
 357                 s->wng->channels = &s->fc->channels;
 358                 s->wng->samplerate = &s->fc->samplerate;
 359                 s->fc->output_eof = &s->wng->eof;
 360                 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
 361         } else {
 362                 s->wng->buf = s->receiver_node->buf;
 363                 s->wng->loaded = &s->receiver_node->loaded;
 364                 s->wng->input_eof = &s->receiver_node->eof;
 365         }
 366         s->wng->task.event_handler = wng_event_handler;
 367         for (i = 0; i < a->num_writers; i++) {
 368                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 369                 s->wng->writer_nodes[i].writer = a->writers[i];
 370         }
 371         ret = wng_open(s->wng);
 372         if (ret < 0) {
 373                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 374                 return;
 375         }
 376         s->wstime = *now;
 377         activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
 378 }
 379
 380 static void rn_event_handler(struct task *t)
 381 {
 382         struct receiver_node *rn = t->private_data;
 383         const struct timeval restart_delay = {0, 10 * 1000};
 384         int i;
 385
 386         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 387         unregister_task(t);
 388         rn->eof = 1;
 389         /* set restart barrier */
 390         FOR_EACH_SLOT(i) {
 391                 if (slot[i].receiver_node != rn)
 392                         continue;
 393                 tv_add(now, &restart_delay, &afi[slot[i].format].restart_barrier);
 394         }
 395 }
 396
 397 static int open_receiver(int format)
 398 {
 399         struct audio_format_info *a = &afi[format];
 400         struct slot_info *s;
 401         int ret, slot_num;
 402         struct receiver_node *rn;
 403         const struct timeval restart_delay = {1, 0};
 404
 405         ret = get_empty_slot();
 406         if (ret < 0)
 407                 goto err;
 408         slot_num = ret;
 409         s = &slot[slot_num];
 410         s->format = format;
 411         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 412         rn = s->receiver_node;
 413         rn->receiver = a->receiver;
 414         rn->conf = a->receiver_conf;
 415         ret = a->receiver->open(s->receiver_node);
 416         if (ret < 0) {
 417                 free(s->receiver_node);
 418                 s->receiver_node = NULL;
 419                 goto err;
 420         }
 421         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 422                 audio_formats[s->format], a->receiver->name, slot_num);
 423         rn->task.private_data = s->receiver_node;
 424         rn->task.pre_select = a->receiver->pre_select;
 425         rn->task.post_select = a->receiver->post_select;
 426         rn->task.event_handler = rn_event_handler;
 427         sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
 428         register_task(&rn->task);
 429         return 1;
 430 err:
 431         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 432         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 433         return ret;
 434 }
 435
 436 static int receiver_running(int format)
 437 {
 438         int i;
 439
 440         FOR_EACH_SLOT(i) {
 441                 struct slot_info *s = &slot[i];
 442                 if (s->format == format && s->receiver_node
 443                                 && !s->receiver_node->eof)
 444                         return 1;
 445         }
 446         return 0;
 447 }
 448
 449 static int open_current_receiver(struct sched *s)
 450 {
 451         int i;
 452         struct timeval diff;
 453         char *audio_format = stat_task->stat_item_values[SI_FORMAT];
 454
 455         if (!audio_format || !stat_task->pcd)
 456                 return 0;
 457         i = get_audio_format_num(audio_format + strlen(
 458                 status_item_list[SI_FORMAT]) + 1);
 459         if (i < 0)
 460                 return 0;
 461         if (receiver_running(i))
 462                 return 0;
 463         if (tv_diff(now, &afi[i].restart_barrier, &diff) < 0) {
 464                 s->timeout = diff;
 465                 return 0;
 466         }
 467         return open_receiver(i) < 0? 0 : 1;
 468 }
 469
 470 static void compute_time_diff(const struct timeval *status_time)
 471 {
 472         struct timeval tmp, diff;
 473         static int count;
 474         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 475         const struct timeval max_deviation = {0, 500 * 1000};
 476         const int time_smooth = 5;
 477
 478         sign = tv_diff(status_time, now, &diff);
 479 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 480 //                      sign, sa_time_diff_sign);
 481         if (!count) {
 482                 sa_time_diff_sign = sign;
 483                 stat_task->sa_time_diff = diff;
 484                 count++;
 485                 goto out;
 486         }
 487         if (count > 5) {
 488                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 489                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 490                         PARA_WARNING_LOG("time diff jump: %lims\n",
 491                                 s * tv2ms(&tmp));
 492         }
 493         count++;
 494         sa_time_diff_sign = tv_convex_combination(
 495                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 496                 count > 10? sign : sign * time_smooth, &diff,
 497                 &tmp);
 498         stat_task->sa_time_diff = tmp;
 499         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 500                 sign > 0? "+" : "-",
 501                 tv2ms(&diff),
 502                 sa_time_diff_sign ? "+" : "-",
 503                 tv2ms(&stat_task->sa_time_diff)
 504         );
 505 out:
 506         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 507 }
 508
 509 static void check_stat_line(char *line)
 510 {
 511         int itemnum;
 512         size_t ilen = 0;
 513         long unsigned sec, usec;
 514         char *tmp;
 515
 516 //      PARA_INFO_LOG("line: %s\n", line);
 517         if (!line)
 518                 return;
 519         itemnum = stat_line_valid(line);
 520         if (itemnum < 0) {
 521                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 522                 return;
 523         }
 524         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 525                 return;
 526         tmp = make_message("%s\n", line);
 527         stat_client_write(tmp, itemnum);
 528         free(tmp);
 529         free(stat_task->stat_item_values[itemnum]);
 530         stat_task->stat_item_values[itemnum] = para_strdup(line);
 531         ilen = strlen(status_item_list[itemnum]);
 532         switch (itemnum) {
 533         case SI_STATUS:
 534                 stat_task->playing = strstr(line, "playing")? 1 : 0;
 535                 break;
 536         case SI_OFFSET:
 537                 stat_task->offset_seconds = atoi(line + ilen + 1);
 538                 break;
 539         case SI_LENGTH:
 540                 stat_task->length_seconds = atoi(line + ilen + 1);
 541                 break;
 542         case SI_STREAM_START:
 543                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 544                         struct timeval a_start, delay;
 545                         delay.tv_sec = conf.stream_delay_arg / 1000;
 546                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 547                         stat_task->server_stream_start.tv_sec = sec;
 548                         stat_task->server_stream_start.tv_usec = usec;
 549                         if (stat_task->sa_time_diff_sign < 0)
 550                                 tv_add(&stat_task->server_stream_start,
 551                                         &stat_task->sa_time_diff, &a_start);
 552                         else
 553                                 tv_diff(&stat_task->server_stream_start,
 554                                         &stat_task->sa_time_diff, &a_start);
 555                         tv_add(&a_start, &delay, &initial_delay_barrier);
 556                 }
 557                 break;
 558         case SI_CURRENT_TIME:
 559                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 560                         struct timeval tv = {sec, usec};
 561                         compute_time_diff(&tv);
 562                 }
 563                 if (stat_task->clock_diff_count)
 564                         stat_task->clock_diff_count--;
 565                 break;
 566         }
 567 }
 568
 569 static void try_to_close_slot(int slot_num)
 570 {
 571         struct slot_info *s = &slot[slot_num];
 572
 573         if (s->format < 0)
 574                 return;
 575         if (s->receiver_node && !s->receiver_node->eof)
 576                 return;
 577         if (s->fc && !s->fc->eof)
 578                 return;
 579         if (s->wng && !s->wng->eof)
 580                 return;
 581         PARA_INFO_LOG("closing slot %d \n", slot_num);
 582         wng_close(s->wng);
 583         close_filters(s->fc);
 584         free(s->fc);
 585         close_receiver(slot_num);
 586         clear_slot(slot_num);
 587 }
 588
 589 /*
 590  * Check if any receivers/filters/writers need to be started and do so if
 591  * neccessary.  Since the pre_select function didn't have a chance yet to put
 592  * file descriptors into the fd sets given by s, make the upcoming select()
 593  * return immediately to avoid a long timeout in case we started something.
 594  */
 595 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
 596 {
 597         int i;
 598         struct timeval min_delay = {0, 1};
 599
 600         t->ret = 1;
 601         if (audiod_status != AUDIOD_ON || !stat_task->playing)
 602                 return kill_all_decoders();
 603         if (open_current_receiver(s))
 604                 s->timeout = min_delay;
 605         FOR_EACH_SLOT(i) {
 606                 struct slot_info *sl = &slot[i];
 607                 struct audio_format_info *a;
 608                 struct timeval diff;
 609
 610                 if (sl->format < 0)
 611                         continue;
 612                 a = &afi[sl->format];
 613                 if (!sl->receiver_node)
 614                         continue;
 615                 if (!a->num_filters) {
 616                         if (sl->receiver_node->loaded && !sl->wng) {
 617                                 open_writers(i);
 618                                 s->timeout = min_delay;
 619                         }
 620                         continue;
 621                 }
 622                 if (sl->receiver_node->loaded && !sl->fc) {
 623                         open_filters(i);
 624                         s->timeout = min_delay;
 625                         continue;
 626                 }
 627                 if (!sl->fc || !*sl->fc->out_loaded || sl->wng)
 628                         continue;
 629                 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
 630                         open_writers(i);
 631                         s->timeout = min_delay;
 632                         continue;
 633                 }
 634                 PARA_INFO_LOG("inital delay: %lu ms left\n", tv2ms(&diff));
 635                 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
 636                         s->timeout = diff;
 637                 }
 638         }
 639 }
 640
 641 static void audiod_post_select(__a_unused struct sched *s,
 642         __a_unused struct task *t)
 643 {
 644         int i;
 645
 646         t->ret = 1;
 647         FOR_EACH_SLOT(i)
 648                 try_to_close_slot(i);
 649 }
 650
 651 static void init_audiod_task(struct task *t)
 652 {
 653         t->pre_select = audiod_pre_select;
 654         t->post_select = audiod_post_select;
 655         t->event_handler = NULL;
 656         t->private_data = t;
 657         sprintf(t->status, "audiod task");
 658 }
 659
 660 static int parse_stream_command(const char *txt, char **cmd)
 661 {
 662         char *p = strchr(txt, ':');
 663         int i;
 664
 665         if (!p)
 666                 return -E_MISSING_COLON;
 667         p++;
 668         FOR_EACH_AUDIO_FORMAT(i) {
 669                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 670                         continue;
 671                 *cmd = p;
 672                 return i;
 673         }
 674         return -E_UNSUPPORTED_AUDIO_FORMAT;
 675 }
 676
 677 static int add_filter(int format, char *cmdline)
 678 {
 679         struct audio_format_info *a = &afi[format];
 680         int filter_num, nf = a->num_filters;
 681
 682         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 683         if (filter_num < 0)
 684                 return filter_num;
 685         a->filters[nf] = &filters[filter_num];
 686         a->num_filters++;
 687         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
 688                 a->filters[nf]->name);
 689         return filter_num;
 690 }
 691
 692 static int init_writers(void)
 693 {
 694         int i, ret, nw;
 695         char *cmd;
 696         struct audio_format_info *a;
 697
 698         init_supported_writers();
 699         nw = PARA_MAX(1, conf.writer_given);
 700         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 701         FOR_EACH_AUDIO_FORMAT(i) {
 702                 a = &afi[i];
 703                 a->writer_conf = para_malloc(nw * sizeof(void *));
 704                 a->writers = para_malloc(nw * sizeof(struct writer *));
 705                 a->num_writers = 0;
 706         }
 707         for (i = 0; i < conf.writer_given; i++) {
 708                 void *wconf;
 709                 int writer_num;
 710                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 711                 if (ret < 0)
 712                         goto out;
 713                 a = &afi[ret];
 714                 nw = a->num_writers;
 715                 wconf = check_writer_arg(cmd, &writer_num);
 716                 if (!wconf) {
 717                         ret = writer_num;
 718                         goto out;
 719                 }
 720                 a->writers[nw] = &writers[writer_num];
 721                 a->writer_conf[nw] = wconf;
 722                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 723                         nw, writer_names[writer_num]);
 724                 a->num_writers++;
 725         }
 726         ret = 1;
 727 out:
 728         return ret;
 729 }
 730
 731 static int init_receivers(void)
 732 {
 733         int i, ret, receiver_num;
 734         char *cmd = NULL;
 735         struct audio_format_info *a;
 736
 737         for (i = 0; receivers[i].name; i++) {
 738                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
 739                 receivers[i].init(&receivers[i]);
 740         }
 741         for (i = conf.receiver_given - 1; i >= 0; i--) {
 742                 char *arg = conf.receiver_arg[i];
 743                 char *recv_arg = strchr(arg, ':');
 744                 ret = -E_MISSING_COLON;
 745                 if (!recv_arg)
 746                         goto out;
 747                 *recv_arg = '\0';
 748                 recv_arg++;
 749                 ret = get_audio_format_num(arg);
 750                 if (ret < 0)
 751                         goto out;
 752                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 753                 if (!afi[ret].receiver_conf) {
 754                         ret = -E_RECV_SYNTAX;
 755                         goto out;
 756                 }
 757                 afi[ret].receiver = &receivers[receiver_num];
 758         }
 759         /* use the first available receiver with no arguments
 760          * for those audio formats for which no receiver
 761          * was specified
 762          */
 763         cmd = para_strdup(receivers[0].name);
 764         FOR_EACH_AUDIO_FORMAT(i) {
 765                 a = &afi[i];
 766                 if (a->receiver_conf)
 767                         continue;
 768                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 769                 if (!a->receiver_conf)
 770                         return -E_RECV_SYNTAX;
 771                 a->receiver = &receivers[receiver_num];
 772         }
 773         ret = 1;
 774 out:
 775         free(cmd);
 776         return ret;
 777 }
 778
 779 static int init_default_filters(void)
 780 {
 781         int i, ret = 1;
 782
 783         FOR_EACH_AUDIO_FORMAT(i) {
 784                 struct audio_format_info *a = &afi[i];
 785                 char *tmp;
 786                 int j;
 787
 788                 if (a->num_filters)
 789                         continue; /* no default -- nothing to to */
 790                 /* add "dec" to audio format name */
 791                 tmp = make_message("%sdec", audio_formats[i]);
 792                 for (j = 0; filters[j].name; j++)
 793                         if (!strcmp(tmp, filters[j].name))
 794                                 break;
 795                 free(tmp);
 796                 ret = -E_UNSUPPORTED_FILTER;
 797                 if (!filters[j].name)
 798                         goto out;
 799                 tmp = para_strdup(filters[j].name);
 800                 ret = add_filter(i, tmp);
 801                 free(tmp);
 802                 if (ret < 0)
 803                         goto out;
 804                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 805                         filters[j].name);
 806         }
 807 out:
 808         return ret;
 809 }
 810
 811 static int init_filters(void)
 812 {
 813         int i, ret, nf;
 814
 815         filter_init(filters);
 816         nf = PARA_MAX(1,  conf.filter_given);
 817         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 818         FOR_EACH_AUDIO_FORMAT(i) {
 819                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 820                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
 821         }
 822         if (!conf.no_default_filters_given)
 823                 return init_default_filters();
 824         for (i = 0; i < conf.filter_given; i++) {
 825                 char *arg = conf.filter_arg[i];
 826                 char *filter_name = strchr(arg, ':');
 827                 ret = -E_MISSING_COLON;
 828                 if (!filter_name)
 829                         goto out;
 830                 *filter_name = '\0';
 831                 filter_name++;
 832                 ret = get_audio_format_num(arg);
 833                 if (ret < 0)
 834                         goto out;
 835                 ret = add_filter(ret, filter_name);
 836                 if (ret < 0)
 837                         goto out;
 838         }
 839         ret = init_default_filters(); /* use default values for the rest */
 840 out:
 841         return ret;
 842 }
 843
 844 static int init_stream_io(void)
 845 {
 846         int ret;
 847
 848         ret = init_writers();
 849         if (ret < 0)
 850                 return ret;
 851         ret = init_receivers();
 852         if (ret < 0)
 853                 return ret;
 854         ret = init_filters();
 855         if (ret < 0)
 856                 return ret;
 857         return 1;
 858 }
 859
 860 static int audiod_get_socket(void)
 861 {
 862         struct sockaddr_un unix_addr;
 863         int fd;
 864
 865         if (conf.socket_given)
 866                 socket_name = para_strdup(conf.socket_arg);
 867         else {
 868                 char *hn = para_hostname();
 869                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 870                         hn);
 871                 free(hn);
 872         }
 873         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 874         if (conf.force_given)
 875                 unlink(socket_name);
 876         fd = create_pf_socket(socket_name, &unix_addr,
 877                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 878         if (fd < 0) {
 879                 PARA_EMERG_LOG("%s", "can not connect to socket\n");
 880                 exit(EXIT_FAILURE); /* do not unlink socket */
 881         }
 882         if (listen(fd , 5) < 0) {
 883                 PARA_EMERG_LOG("%s", "can not listen on socket\n");
 884                 exit(EXIT_FAILURE); /* do not unlink socket */
 885         }
 886         mark_fd_nonblock(fd);
 887         return fd;
 888 }
 889
 890 static void signal_event_handler(struct task *t)
 891 {
 892         struct signal_task *st = t->private_data;
 893
 894         switch (st->signum) {
 895         case SIGINT:
 896         case SIGTERM:
 897         case SIGHUP:
 898                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 899                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 900         }
 901 }
 902
 903 static void signal_pre_select(struct sched *s, struct task *t)
 904 {
 905         struct signal_task *st = t->private_data;
 906         t->ret = 1;
 907         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 908 }
 909
 910 static void signal_post_select(struct sched *s, struct task *t)
 911 {
 912         struct signal_task *st = t->private_data;
 913         t->ret = 1;
 914         if (!FD_ISSET(st->fd, &s->rfds))
 915                 return;
 916         t->ret = -E_SIGNAL_CAUGHT;
 917         st->signum = para_next_signal();
 918 }
 919
 920 static void signal_setup_default(struct signal_task *st)
 921 {
 922         st->task.pre_select = signal_pre_select;
 923         st->task.post_select = signal_post_select;
 924         st->task.private_data = st;
 925         sprintf(st->task.status, "signal task");
 926 }
 927
 928 static void command_pre_select(struct sched *s, struct task *t)
 929 {
 930         struct command_task *ct = t->private_data;
 931         t->ret = 1;
 932         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 933
 934 }
 935
 936 static void command_post_select(struct sched *s, struct task *t)
 937 {
 938         int ret;
 939         struct command_task *ct = t->private_data;
 940
 941         t->ret = 1; /* always successful */
 942         audiod_status_dump();
 943         if (!FD_ISSET(ct->fd, &s->rfds))
 944                 return;
 945         ret = handle_connect(ct->fd);
 946         if (ret < 0)
 947                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 948 }
 949
 950 static void init_command_task(struct command_task *ct)
 951 {
 952         ct->task.pre_select = command_pre_select;
 953         ct->task.post_select = command_post_select;
 954         ct->task.event_handler = NULL;
 955         ct->task.private_data = ct;
 956         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 957         sprintf(ct->task.status, "command task");
 958 }
 959
 960 static void close_stat_pipe(void)
 961 {
 962         int i;
 963
 964         if (!stat_task->pcd)
 965                 return;
 966         client_close(stat_task->pcd);
 967         stat_task->pcd = NULL;
 968         for (i = 0; i < NUM_STAT_ITEMS; i++) {
 969                 free(stat_task->stat_item_values[i]);
 970                 stat_task->stat_item_values[i] = NULL;
 971         }
 972         dump_empty_status();
 973         stat_task->length_seconds = 0;
 974         stat_task->offset_seconds = 0;
 975         audiod_status_dump();
 976         stat_task->playing = 0;
 977         stat_task->stat_item_values[SI_STATUS_BAR] = make_message(
 978                 "%s:no connection to para_server\n",
 979                 status_item_list[SI_STATUS_BAR]);
 980         stat_client_write(stat_task->stat_item_values[SI_STATUS_BAR],
 981                 SI_STATUS_BAR);
 982         if (stat_task->clock_diff_count) {
 983                 stat_task->clock_diff_barrier.tv_sec = now->tv_sec + 1;
 984                 stat_task->clock_diff_barrier.tv_usec = now->tv_usec;
 985         }
 986 }
 987
 988 /**
 989  * close the connection to para_server and exit
 990  *
 991  * \param status the exit status which is passed to exit(3)
 992  * \param msg the log message
 993  *
 994  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
 995  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
 996  * EXIT_FAILURE.
 997  *
 998  * \sa exit(3)
 999  */
1000 void __noreturn clean_exit(int status, const char *msg)
1001 {
1002         PARA_EMERG_LOG("%s\n", msg);
1003         if (socket_name)
1004                 unlink(socket_name);
1005         close_stat_pipe();
1006         exit(status);
1007 }
1008
1009
1010 static void client_task_event_handler(__a_unused struct task *t)
1011 {
1012         int i;
1013         struct timeval delay = {1, 0};
1014
1015         if (t->ret == -E_HANDSHAKE_COMPLETE)
1016                 return;
1017         unregister_task(t);
1018         close_stat_pipe();
1019         if (t->ret != -E_SERVER_EOF)
1020                 stat_task->clock_diff_count = conf.clock_diff_count_arg;
1021         /* avoid busy loop if server is down */
1022         tv_add(now, &delay, &stat_task->restart_barrier);
1023         FOR_EACH_AUDIO_FORMAT(i)
1024                 afi[i].restart_barrier = stat_task->restart_barrier;
1025 }
1026
1027 static void status_pre_select(struct sched *s, struct task *t)
1028 {
1029         struct status_task *st = t->private_data;
1030         int ret;
1031
1032         t->ret = 1; /* always successful */
1033         if (st->pcd || audiod_status == AUDIOD_OFF)
1034                 return;
1035         if (!st->clock_diff_count && tv_diff(now, &st->restart_barrier, NULL)
1036                         < 0)
1037                 return;
1038         if (st->clock_diff_count) {
1039                 char *argv[] = {"audiod", "stat", "1", NULL};
1040                 int argc = 3;
1041                 if (tv_diff(now, &st->clock_diff_barrier, NULL) < 0)
1042                         return;
1043                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1044                 ret = client_open(argc, argv, &st->pcd);
1045
1046         } else {
1047                 char *argv[] = {"audiod", "stat", NULL};
1048                 int argc = 2;
1049                 ret = client_open(argc, argv, &st->pcd);
1050         }
1051         if (ret < 0)
1052                 return;
1053         st->pcd->task.event_handler = client_task_event_handler;
1054         s->timeout.tv_sec = 0;
1055         s->timeout.tv_usec = 1;
1056 }
1057
1058 static void status_post_select(__a_unused struct sched *s, struct task *t)
1059 {
1060         struct status_task *st = t->private_data;
1061         unsigned bytes_left;
1062
1063         t->ret = 1;
1064         if (!st->pcd || st->pcd->status != CL_RECEIVING)
1065                 return;
1066         if (st->pcd && audiod_status == AUDIOD_OFF) {
1067                 unregister_task(&st->pcd->task);
1068                 close_stat_pipe();
1069                 st->clock_diff_count = conf.clock_diff_count_arg;
1070                 return;
1071         }
1072         bytes_left = for_each_line(st->pcd->buf, st->pcd->loaded,
1073                 &check_stat_line);
1074         if (st->pcd->loaded != bytes_left) {
1075                 st->last_status_read = *now;
1076                 st->pcd->loaded = bytes_left;
1077         } else {
1078                 struct timeval diff;
1079                 tv_diff(now, &st->last_status_read, &diff);
1080                 if (diff.tv_sec > 61)
1081                         close_stat_pipe();
1082         }
1083 }
1084
1085 static void init_status_task(struct status_task *st)
1086 {
1087         memset(st, 0, sizeof(struct status_task));
1088         st->task.pre_select = status_pre_select;
1089         st->task.post_select = status_post_select;
1090         st->task.private_data = st;
1091         st->sa_time_diff_sign = 1;
1092         st->clock_diff_count = conf.clock_diff_count_arg;
1093         sprintf(st->task.status, "status task");
1094 }
1095
1096 static void set_initial_status(void)
1097 {
1098         audiod_status = AUDIOD_ON;
1099         if (!conf.mode_given)
1100                 return;
1101         if (!strcmp(conf.mode_arg, "sb")) {
1102                 audiod_status = AUDIOD_STANDBY;
1103                 return;
1104         }
1105         if (!strcmp(conf.mode_arg, "off")) {
1106                 audiod_status = AUDIOD_OFF;
1107                 return;
1108         }
1109         if (strcmp(conf.mode_arg, "on"))
1110                 PARA_WARNING_LOG("%s", "invalid mode\n");
1111 }
1112
1113 /**
1114  * the main function of para_audiod
1115  *
1116  * \param argc usual argument count
1117  * \param argv usual argument vector
1118  *
1119  * \return EXIT_SUCCESS or EXIT_FAILURE
1120  *
1121  * \sa para_audiod(1)
1122  * */
1123 int main(int argc, char *argv[])
1124 {
1125         char *cf;
1126         int ret, i;
1127         struct sched s;
1128         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1129         struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1130
1131         valid_fd_012();
1132         audiod_cmdline_parser(argc, argv, &conf);
1133         HANDLE_VERSION_FLAG("audiod", conf);
1134         para_drop_privileges(conf.user_arg, conf.group_arg);
1135         cf = configfile_exists();
1136         if (cf) {
1137                 if (audiod_cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1138                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1139                         exit(EXIT_FAILURE);
1140                 }
1141         }
1142         if (conf.logfile_given)
1143                 logfile = open_log(conf.logfile_arg);
1144         log_welcome("para_audiod", conf.loglevel_arg);
1145         i = init_stream_io();
1146         if (i < 0) {
1147                 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1148                 exit(EXIT_FAILURE);
1149         }
1150         server_uptime(UPTIME_SET);
1151         set_initial_status();
1152         FOR_EACH_SLOT(i)
1153                 clear_slot(i);
1154         init_grabbing();
1155         setup_signal_handling();
1156         signal_setup_default(sig_task);
1157         sig_task->task.event_handler = signal_event_handler;
1158
1159         init_status_task(stat_task);
1160         init_command_task(cmd_task);
1161         init_audiod_task(audiod_task);
1162
1163         if (conf.daemon_given)
1164                 daemon_init();
1165
1166         register_task(&sig_task->task);
1167         register_task(&cmd_task->task);
1168         register_task(&stat_task->task);
1169         register_task(audiod_task);
1170         s.default_timeout.tv_sec = 0;
1171         s.default_timeout.tv_usec = 99 * 1000;
1172         ret = sched(&s);
1173
1174         PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1175         return EXIT_FAILURE;
1176 }