audiod.c

   1 /*
   2  * Copyright (C) 2005-2006 Andre Noll <noll@mathematik.tu-darmstadt.de>
   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
  41 /** define the array of error lists needed by para_audiod */
  42 INIT_AUDIOD_ERRLISTS;
  43 /** define the array containing all supported audio formats */
  44 DEFINE_AUDIO_FORMAT_ARRAY;
  45
  46 /** defines how to handle one supported audio format */
  47 struct audio_format_info {
  48         /** pointer to the receiver for this audio format */
  49         struct receiver *receiver;
  50         /** the receiver configuration */
  51         void *receiver_conf;
  52         /** the number of filters that should be activated for this audio format */
  53         unsigned int num_filters;
  54         /** pointer to the array of filters to be activated */
  55         struct filter **filters;
  56         /** pointer to the array of filter configurations */
  57         void **filter_conf;
  58         /** the number of filters that should be activated for this audio format */
  59         unsigned int num_writers;
  60         /** pointer to the array of writers to be activated */
  61         struct writer **writers;
  62         /** pointer to the array of writer configurations */
  63         void **writer_conf;
  64         /** do not start receiver/filters/writer before this time */
  65         struct timeval restart_barrier;
  66 };
  67
  68 struct slot_info slot[MAX_STREAM_SLOTS];
  69
  70
  71 int audiod_status = AUDIOD_ON;
  72
  73 struct audiod_args_info conf;
  74 static char *socket_name;
  75 static FILE *logfile;
  76 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
  77
  78 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
  79
  80 static struct status_task status_task_struct;
  81 struct status_task *stat_task = &status_task_struct;
  82 static struct timeval initial_delay_barrier;
  83
  84 /**
  85  * the task for handling audiod commands
  86  *
  87  * \sa struct task, struct sched
  88  */
  89 struct command_task {
  90         /** the local listening socket */
  91         int fd;
  92         /** the associated task structure */
  93         struct task task;
  94 };
  95
  96 /**
  97  * task for signal handling
  98  */
  99 struct signal_task {
 100         /** the signal pipe */
 101         int fd;
 102         /** the number of the most recent signal */
 103         int signum;
 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         FOR_EACH_AUDIO_FORMAT(i)
 122                 if (!strcmp(name, audio_formats[i]))
 123                         return i;
 124         return -E_UNSUPPORTED_AUDIO_FORMAT;
 125 }
 126
 127 /*
 128  * log function. first argument is loglevel.
 129  */
 130 void para_log(int ll, const char* fmt,...)
 131 {
 132         va_list argp;
 133         FILE *outfd;
 134         struct tm *tm;
 135         time_t t1;
 136         char str[MAXLINE] = "";
 137         static char *hostname;
 138
 139         if (ll < conf.loglevel_arg)
 140                 return;
 141         if (!hostname)
 142                 hostname = para_hostname();
 143         outfd = logfile? logfile : stderr;
 144         time(&t1);
 145         tm = localtime(&t1);
 146         strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
 147         fprintf(outfd, "%s %s ", str, hostname);
 148         if (conf.loglevel_arg <= INFO)
 149                 fprintf(outfd, "%i ", ll);
 150         va_start(argp, fmt);
 151         vfprintf(outfd, fmt, argp);
 152         va_end(argp);
 153 }
 154
 155 static char *configfile_exists(void)
 156 {
 157         static char *config_file;
 158
 159         if (!config_file) {
 160                 char *home = para_homedir();
 161                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 162                 free(home);
 163         }
 164         return file_exists(config_file)? config_file : NULL;
 165 }
 166
 167 static void setup_signal_handling(void)
 168 {
 169         sig_task->fd = para_signal_init();
 170         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 171         para_install_sighandler(SIGINT);
 172         para_install_sighandler(SIGTERM);
 173         para_install_sighandler(SIGHUP);
 174         signal(SIGPIPE, SIG_IGN);
 175 }
 176
 177 static void clear_slot(int slot_num)
 178 {
 179         struct slot_info *s = &slot[slot_num];
 180
 181         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 182         memset(s, 0, sizeof(struct slot_info));
 183         s->format = -1;
 184 }
 185
 186 static void close_receiver(int slot_num)
 187 {
 188         struct slot_info *s = &slot[slot_num];
 189         struct audio_format_info *a;
 190
 191         if (s->format < 0 || !s->receiver_node)
 192                 return;
 193         a = &afi[s->format];
 194         PARA_NOTICE_LOG("closing %s receiver in slot %d (eof = %d)\n",
 195                 audio_formats[s->format] , slot_num, s->receiver_node->eof);
 196         a->receiver->close(s->receiver_node);
 197         free(s->receiver_node);
 198         s->receiver_node = NULL;
 199 }
 200
 201 static void kill_all_decoders(void)
 202 {
 203         int i;
 204
 205         FOR_EACH_SLOT(i) {
 206                 struct slot_info *s = &slot[i];
 207                 if (s->wng && !s->wng->eof) {
 208                         PARA_INFO_LOG("unregistering writer node group in slot %d\n",
 209                                 i);
 210                         wng_unregister(s->wng);
 211                         s->wng->eof = 1;
 212                 }
 213                 if (s->fc && !s->fc->eof) {
 214                         PARA_INFO_LOG("unregistering filter chain in slot %d\n", i);
 215                         unregister_task(&s->fc->task);
 216                         s->fc->eof = 1;
 217                 }
 218                 if (s->receiver_node && !s->receiver_node->eof) {
 219                         PARA_INFO_LOG("unregistering receiver_node in slot %d\n", i);
 220                         unregister_task(&s->receiver_node->task);
 221                         s->receiver_node->eof = 1;
 222                 }
 223         }
 224 }
 225
 226 static int get_empty_slot(void)
 227 {
 228         int i;
 229         struct slot_info *s;
 230
 231         FOR_EACH_SLOT(i) {
 232                 s = &slot[i];
 233                 if (s->format < 0) {
 234                         clear_slot(i);
 235                         return i;
 236                 }
 237                 if (s->wng || s->receiver_node || s->fc)
 238                         continue;
 239                 clear_slot(i);
 240                 return i;
 241         }
 242         return -E_NO_MORE_SLOTS;
 243 }
 244
 245 static void close_stat_pipe(void)
 246 {
 247         int i;
 248
 249         if (!stat_task->pcd)
 250                 return;
 251         client_close(stat_task->pcd);
 252         stat_task->pcd = NULL;
 253         for (i = 0; i < NUM_STAT_ITEMS; i++) {
 254                 free(stat_task->stat_item_values[i]);
 255                 stat_task->stat_item_values[i] = NULL;
 256         }
 257         dump_empty_status();
 258         stat_task->length_seconds = 0;
 259         stat_task->offset_seconds = 0;
 260         audiod_status_dump();
 261         stat_task->playing = 0;
 262         stat_task->stat_item_values[SI_STATUS_BAR] = make_message(
 263                 "%s:no connection to para_server\n",
 264                 status_item_list[SI_STATUS_BAR]);
 265         stat_client_write(stat_task->stat_item_values[SI_STATUS_BAR], SI_STATUS_BAR);
 266 }
 267
 268 void __noreturn clean_exit(int status, const char *msg)
 269 {
 270         PARA_EMERG_LOG("%s\n", msg);
 271         if (socket_name)
 272                 unlink(socket_name);
 273         close_stat_pipe();
 274         exit(status);
 275 }
 276
 277 /**
 278  * get the number of filters
 279  *
 280  * \param audio_format_num the number identifying the audio format
 281  *
 282  * \return the number of filters for the given audio format
 283  *
 284  * \sa struct filter;
 285  */
 286 int num_filters(int audio_format_num)
 287 {
 288         return afi[audio_format_num].num_filters;
 289 }
 290
 291 static void filter_event_handler(struct task *t)
 292 {
 293         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 294         struct filter_chain *fc = t->private_data;
 295         fc->eof = 1;
 296         unregister_task(t);
 297 }
 298
 299 static void open_filters(int slot_num)
 300 {
 301         struct slot_info *s = &slot[slot_num];
 302         struct audio_format_info *a = &afi[s->format];
 303         int nf = a->num_filters;
 304         int i;
 305
 306         s->fc = NULL;
 307         if (!nf)
 308                 return;
 309         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 310         s->fc = para_calloc(sizeof(struct filter_chain));
 311         INIT_LIST_HEAD(&s->fc->filters);
 312         s->fc->inbuf = s->receiver_node->buf;
 313         s->fc->in_loaded = &s->receiver_node->loaded;
 314         s->fc->input_eof = &s->receiver_node->eof;
 315         s->fc->task.pre_select = filter_pre_select;
 316         s->fc->task.event_handler = filter_event_handler;
 317         s->fc->task.private_data = s->fc;
 318         s->fc->eof = 0;
 319
 320         s->receiver_node->output_eof = &s->fc->eof;
 321         sprintf(s->fc->task.status, "filter chain");
 322         for (i = 0; i < nf; i++) {
 323                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 324                 fn->conf = a->filter_conf[i];
 325                 fn->fc = s->fc;
 326                 fn->filter = a->filters[i];
 327                 INIT_LIST_HEAD(&fn->callbacks);
 328                 list_add_tail(&fn->node, &s->fc->filters);
 329                 fn->filter->open(fn);
 330                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 331                         audio_formats[s->format], i + 1,  nf,
 332                         fn->filter->name, slot_num);
 333                 s->fc->outbuf = fn->buf;
 334                 s->fc->out_loaded = &fn->loaded;
 335         }
 336         register_task(&s->fc->task);
 337 }
 338
 339 static void wng_event_handler(struct task *t)
 340 {
 341         struct writer_node_group *wng = t->private_data;
 342
 343         PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
 344         wng->eof = 1;
 345         wng_unregister(wng);
 346 }
 347
 348 static void open_writers(int slot_num)
 349 {
 350         int ret, i;
 351         struct slot_info *s = &slot[slot_num];
 352         struct audio_format_info *a = &afi[s->format];
 353
 354         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 355         if (!a->num_writers)
 356                 s->wng = setup_default_wng();
 357         else
 358                 s->wng = wng_new(a->num_writers);
 359         if (s->fc) {
 360                 s->wng->buf = s->fc->outbuf;
 361                 s->wng->loaded = s->fc->out_loaded;
 362                 s->wng->input_eof = &s->fc->eof;
 363                 s->wng->channels = &s->fc->channels;
 364                 s->wng->samplerate = &s->fc->samplerate;
 365                 s->fc->output_eof = &s->wng->eof;
 366                 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
 367         } else {
 368                 s->wng->buf = s->receiver_node->buf;
 369                 s->wng->loaded = &s->receiver_node->loaded;
 370                 s->wng->input_eof = &s->receiver_node->eof;
 371         }
 372         s->wng->task.event_handler = wng_event_handler;
 373         for (i = 0; i < a->num_writers; i++) {
 374                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 375                 s->wng->writer_nodes[i].writer = a->writers[i];
 376         }
 377         ret = wng_open(s->wng);
 378         if (ret < 0) {
 379                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 380                 return;
 381         }
 382         s->wstime = *now;
 383         activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
 384 }
 385
 386 static void rn_event_handler(struct task *t)
 387 {
 388         struct receiver_node *rn = t->private_data;
 389         const struct timeval restart_delay = {0, 10 * 1000};
 390         int i;
 391
 392         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 393         unregister_task(t);
 394         rn->eof = 1;
 395         /* set restart barrier */
 396         FOR_EACH_SLOT(i) {
 397                 if (slot[i].receiver_node != rn)
 398                         continue;
 399                 tv_add(now, &restart_delay, &afi[slot[i].format].restart_barrier);
 400         }
 401 }
 402
 403 static int open_receiver(int format)
 404 {
 405         struct audio_format_info *a = &afi[format];
 406         struct slot_info *s;
 407         int ret, slot_num;
 408         struct receiver_node *rn;
 409         const struct timeval restart_delay = {1, 0};
 410
 411         ret = get_empty_slot();
 412         if (ret < 0)
 413                 goto err;
 414         slot_num = ret;
 415         s = &slot[slot_num];
 416         s->format = format;
 417         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 418         rn = s->receiver_node;
 419         rn->receiver = a->receiver;
 420         rn->conf = a->receiver_conf;
 421         ret = a->receiver->open(s->receiver_node);
 422         if (ret < 0) {
 423                 free(s->receiver_node);
 424                 s->receiver_node = NULL;
 425                 goto err;
 426         }
 427         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 428                 audio_formats[s->format], a->receiver->name, slot_num);
 429         rn->task.private_data = s->receiver_node;
 430         rn->task.pre_select = a->receiver->pre_select;
 431         rn->task.post_select = a->receiver->post_select;
 432         rn->task.event_handler = rn_event_handler;
 433         sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
 434         register_task(&rn->task);
 435         return 1;
 436 err:
 437         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 438         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 439         return ret;
 440 }
 441
 442 static int receiver_running(int format)
 443 {
 444         int i;
 445
 446         FOR_EACH_SLOT(i) {
 447                 struct slot_info *s = &slot[i];
 448                 if (s->format == format && s->receiver_node
 449                                 && !s->receiver_node->eof)
 450                         return 1;
 451         }
 452         return 0;
 453 }
 454
 455 static int open_current_receiver(struct sched *s)
 456 {
 457         int i;
 458         struct timeval diff;
 459
 460         if (!stat_task->af_status || !stat_task->pcd)
 461                 return 0;
 462         i = get_audio_format_num(stat_task->af_status);
 463         if (i < 0)
 464                 return 0;
 465         if (receiver_running(i))
 466                 return 0;
 467         if (tv_diff(now, &afi[i].restart_barrier, &diff) < 0) {
 468                 s->timeout = diff;
 469                 return 0;
 470         }
 471         return open_receiver(i) < 0? 0 : 1;
 472 }
 473
 474 static void compute_time_diff(const struct timeval *status_time)
 475 {
 476         struct timeval tmp, diff;
 477         static int count;
 478         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 479         const struct timeval max_deviation = {0, 500 * 1000};
 480         const int time_smooth = 5;
 481
 482         sign = tv_diff(status_time, now, &diff);
 483 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 484 //                      sign, sa_time_diff_sign);
 485         if (!count) {
 486                 sa_time_diff_sign = sign;
 487                 stat_task->sa_time_diff = diff;
 488                 count++;
 489                 return;
 490         }
 491         if (count > 5) {
 492                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 493                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 494                         PARA_WARNING_LOG("time diff jump: %lims\n",
 495                                 s * tv2ms(&tmp));
 496         }
 497         count++;
 498         sa_time_diff_sign = tv_convex_combination(
 499                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 500                 count > 10? sign : sign * time_smooth, &diff,
 501                 &tmp);
 502         stat_task->sa_time_diff = tmp;
 503         PARA_DEBUG_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 504                 sign > 0? "+" : "-",
 505                 tv2ms(&diff),
 506                 sa_time_diff_sign ? "+" : "-",
 507                 tv2ms(&stat_task->sa_time_diff)
 508         );
 509 }
 510
 511 static void check_stat_line(char *line)
 512 {
 513         int itemnum;
 514         size_t ilen = 0;
 515         long unsigned sec, usec;
 516         char *tmp;
 517
 518 //      PARA_INFO_LOG("line: %s\n", line);
 519         if (!line)
 520                 return;
 521         itemnum = stat_line_valid(line);
 522         if (itemnum < 0) {
 523                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 524                 return;
 525         }
 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_FORMAT:
 537                 free(stat_task->af_status);
 538                 stat_task->af_status = para_strdup(line + ilen + 1);
 539                 break;
 540         case SI_OFFSET:
 541                 stat_task->offset_seconds = atoi(line + ilen + 1);
 542                 break;
 543         case SI_LENGTH:
 544                 stat_task->length_seconds = atoi(line + ilen + 1);
 545                 break;
 546         case SI_STREAM_START:
 547                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 548                         struct timeval a_start, delay;
 549                         delay.tv_sec = conf.stream_delay_arg / 1000;
 550                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 551                         stat_task->server_stream_start.tv_sec = sec;
 552                         stat_task->server_stream_start.tv_usec = usec;
 553                         if (stat_task->sa_time_diff_sign < 0)
 554                                 tv_add(&stat_task->server_stream_start,
 555                                         &stat_task->sa_time_diff, &a_start);
 556                         else
 557                                 tv_diff(&stat_task->server_stream_start,
 558                                         &stat_task->sa_time_diff, &a_start);
 559                         tv_add(&a_start, &delay, &initial_delay_barrier);
 560                 }
 561                 break;
 562         case SI_CURRENT_TIME:
 563                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 564                         struct timeval tv = {sec, usec};
 565                         compute_time_diff(&tv);
 566                 }
 567                 break;
 568         }
 569 }
 570
 571 static void handle_signal(int sig)
 572 {
 573         switch (sig) {
 574         case SIGINT:
 575         case SIGTERM:
 576         case SIGHUP:
 577                 PARA_EMERG_LOG("terminating on signal %d\n", sig);
 578                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 579                 return;
 580         }
 581 }
 582
 583 static void try_to_close_slot(int slot_num)
 584 {
 585         struct slot_info *s = &slot[slot_num];
 586
 587         if (s->format < 0)
 588                 return;
 589         if (s->receiver_node && !s->receiver_node->eof)
 590                 return;
 591         if (s->fc && !s->fc->eof)
 592                 return;
 593         if (s->wng && !s->wng->eof)
 594                 return;
 595         PARA_INFO_LOG("closing slot %d \n", slot_num);
 596         wng_close(s->wng);
 597         close_filters(s->fc);
 598         free(s->fc);
 599         close_receiver(slot_num);
 600         clear_slot(slot_num);
 601 }
 602
 603 /*
 604  * Check if any receivers/filters/writers need to be started and do so if
 605  * neccessary.  Since the pre_select function didn't have a chance yet to put
 606  * file descriptors into the fd sets given by s, make the upcoming select()
 607  * return immediately to avoid a long timeout in case we started something.
 608  */
 609 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
 610 {
 611         int i;
 612         struct timeval min_delay = {0, 1};
 613
 614         t->ret = 1;
 615         if (audiod_status != AUDIOD_ON || !stat_task->playing)
 616                 return kill_all_decoders();
 617         if (open_current_receiver(s))
 618                 s->timeout = min_delay;
 619         FOR_EACH_SLOT(i) {
 620                 struct slot_info *sl = &slot[i];
 621                 struct audio_format_info *a;
 622                 struct timeval diff;
 623
 624                 if (sl->format < 0)
 625                         continue;
 626                 a = &afi[sl->format];
 627                 if (!sl->receiver_node)
 628                         continue;
 629                 if (!a->num_filters) {
 630                         if (sl->receiver_node->loaded && !sl->wng) {
 631                                 open_writers(i);
 632                                 s->timeout = min_delay;
 633                         }
 634                         continue;
 635                 }
 636                 if (sl->receiver_node->loaded && !sl->fc) {
 637                         open_filters(i);
 638                         s->timeout = min_delay;
 639                         continue;
 640                 }
 641                 if (!sl->fc || !*sl->fc->out_loaded || sl->wng)
 642                         continue;
 643                 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
 644                         PARA_INFO_LOG("barrier: %lu:%lu, now: %lu, %lu\n",
 645                                 initial_delay_barrier.tv_sec,
 646                                 initial_delay_barrier.tv_usec,
 647                                 now->tv_sec, now->tv_usec);
 648                         open_writers(i);
 649                         s->timeout = min_delay;
 650                         continue;
 651                 }
 652                 PARA_INFO_LOG("inital delay: %lu ms left\n", tv2ms(&diff));
 653                 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
 654                         s->timeout = diff;
 655                 }
 656         }
 657 }
 658
 659 static void audiod_post_select(__a_unused struct sched *s,
 660         __a_unused struct task *t)
 661 {
 662         int i;
 663
 664         t->ret = 1;
 665         FOR_EACH_SLOT(i)
 666                 try_to_close_slot(i);
 667 }
 668
 669 static void init_audiod_task(struct task *t)
 670 {
 671         t->pre_select = audiod_pre_select;
 672         t->post_select = audiod_post_select;
 673         t->event_handler = NULL;
 674         t->private_data = t;
 675         sprintf(t->status, "audiod task");
 676 }
 677
 678 static int parse_stream_command(const char *txt, char **cmd)
 679 {
 680         char *p = strchr(txt, ':');
 681         int i;
 682
 683         if (!p)
 684                 return -E_MISSING_COLON;
 685         p++;
 686         FOR_EACH_AUDIO_FORMAT(i) {
 687                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 688                         continue;
 689                 *cmd = p;
 690                 return i;
 691         }
 692         return -E_UNSUPPORTED_AUDIO_FORMAT;
 693 }
 694
 695 static int add_filter(int format, char *cmdline)
 696 {
 697         struct audio_format_info *a = &afi[format];
 698         int filter_num, nf = a->num_filters;
 699
 700         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 701         if (filter_num < 0)
 702                 return filter_num;
 703         a->filters[nf] = &filters[filter_num];
 704         a->num_filters++;
 705         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
 706                 a->filters[nf]->name);
 707         return filter_num;
 708 }
 709
 710 static int init_writers(void)
 711 {
 712         int i, ret, nw;
 713         char *cmd;
 714         struct audio_format_info *a;
 715
 716         init_supported_writers();
 717         nw = PARA_MAX(1, conf.writer_given);
 718         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 719         FOR_EACH_AUDIO_FORMAT(i) {
 720                 a = &afi[i];
 721                 a->writer_conf = para_malloc(nw * sizeof(void *));
 722                 a->writers = para_malloc(nw * sizeof(struct writer *));
 723                 a->num_writers = 0;
 724         }
 725         for (i = 0; i < conf.writer_given; i++) {
 726                 void *wconf;
 727                 int writer_num;
 728                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 729                 if (ret < 0)
 730                         goto out;
 731                 a = &afi[ret];
 732                 nw = a->num_writers;
 733                 wconf = check_writer_arg(cmd, &writer_num);
 734                 if (!wconf) {
 735                         ret = writer_num;
 736                         goto out;
 737                 }
 738                 a->writers[nw] = &writers[writer_num];
 739                 a->writer_conf[nw] = wconf;
 740                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 741                         nw, writer_names[writer_num]);
 742                 a->num_writers++;
 743         }
 744         ret = 1;
 745 out:
 746         return ret;
 747 }
 748
 749 static int init_receivers(void)
 750 {
 751         int i, ret, receiver_num;
 752         char *cmd = NULL;
 753         struct audio_format_info *a;
 754
 755         for (i = 0; receivers[i].name; i++) {
 756                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
 757                 receivers[i].init(&receivers[i]);
 758         }
 759         for (i = conf.receiver_given - 1; i >= 0; i--) {
 760                 char *arg = conf.receiver_arg[i];
 761                 char *recv_arg = strchr(arg, ':');
 762                 PARA_INFO_LOG("arg: %s\n", arg);
 763                 ret = -E_MISSING_COLON;
 764                 if (!recv_arg)
 765                         goto out;
 766                 *recv_arg = '\0';
 767                 recv_arg++;
 768                 ret = get_audio_format_num(arg);
 769                 if (ret < 0)
 770                         goto out;
 771                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 772                 if (!afi[ret].receiver_conf) {
 773                         ret = -E_RECV_SYNTAX;
 774                         goto out;
 775                 }
 776                 afi[ret].receiver = &receivers[receiver_num];
 777         }
 778         /* use the first available receiver with no arguments
 779          * for those audio formats for which no receiver
 780          * was specified
 781          */
 782         cmd = para_strdup(receivers[0].name);
 783         FOR_EACH_AUDIO_FORMAT(i) {
 784                 a = &afi[i];
 785                 if (a->receiver_conf)
 786                         continue;
 787                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 788                 if (!a->receiver_conf)
 789                         return -E_RECV_SYNTAX;
 790                 a->receiver = &receivers[receiver_num];
 791         }
 792         ret = 1;
 793 out:
 794         free(cmd);
 795         return ret;
 796 }
 797
 798 static int init_default_filters(void)
 799 {
 800         int i, ret = 1;
 801
 802         FOR_EACH_AUDIO_FORMAT(i) {
 803                 struct audio_format_info *a = &afi[i];
 804                 char *tmp;
 805                 int j;
 806
 807                 if (a->num_filters)
 808                         continue; /* no default -- nothing to to */
 809                 /* add "dec" to audio format name */
 810                 tmp = make_message("%sdec", audio_formats[i]);
 811                 for (j = 0; filters[j].name; j++)
 812                         if (!strcmp(tmp, filters[j].name))
 813                                 break;
 814                 free(tmp);
 815                 ret = -E_UNSUPPORTED_FILTER;
 816                 if (!filters[j].name)
 817                         goto out;
 818                 tmp = para_strdup(filters[j].name);
 819                 ret = add_filter(i, tmp);
 820                 free(tmp);
 821                 if (ret < 0)
 822                         goto out;
 823                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 824                         filters[j].name);
 825         }
 826 out:
 827         return ret;
 828 }
 829
 830 static int init_filters(void)
 831 {
 832         int i, ret, nf;
 833
 834         filter_init(filters);
 835         nf = PARA_MAX(1,  conf.filter_given);
 836         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 837         FOR_EACH_AUDIO_FORMAT(i) {
 838                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 839                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
 840         }
 841         if (!conf.no_default_filters_given)
 842                 return init_default_filters();
 843         for (i = 0; i < conf.filter_given; i++) {
 844                 char *arg = conf.filter_arg[i];
 845                 char *filter_name = strchr(arg, ':');
 846                 ret = -E_MISSING_COLON;
 847                 if (!filter_name)
 848                         goto out;
 849                 *filter_name = '\0';
 850                 filter_name++;
 851                 ret = get_audio_format_num(arg);
 852                 if (ret < 0)
 853                         goto out;
 854                 ret = add_filter(ret, filter_name);
 855                 if (ret < 0)
 856                         goto out;
 857         }
 858         ret = init_default_filters(); /* use default values for the rest */
 859 out:
 860         return ret;
 861 }
 862
 863 static int init_stream_io(void)
 864 {
 865         int ret;
 866
 867         ret = init_writers();
 868         if (ret < 0)
 869                 return ret;
 870         ret = init_receivers();
 871         if (ret < 0)
 872                 return ret;
 873         ret = init_filters();
 874         if (ret < 0)
 875                 return ret;
 876         return 1;
 877 }
 878
 879 static int audiod_get_socket(void)
 880 {
 881         struct sockaddr_un unix_addr;
 882         int fd;
 883
 884         if (conf.socket_given)
 885                 socket_name = para_strdup(conf.socket_arg);
 886         else {
 887                 char *hn = para_hostname();
 888                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 889                         hn);
 890                 free(hn);
 891         }
 892         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 893         if (conf.force_given)
 894                 unlink(socket_name);
 895         fd = create_pf_socket(socket_name, &unix_addr,
 896                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 897         if (fd < 0) {
 898                 PARA_EMERG_LOG("%s", "can not connect to socket\n");
 899                 exit(EXIT_FAILURE); /* do not unlink socket */
 900         }
 901         if (listen(fd , 5) < 0) {
 902                 PARA_EMERG_LOG("%s", "can not listen on socket\n");
 903                 exit(EXIT_FAILURE); /* do not unlink socket */
 904         }
 905         mark_fd_nonblock(fd);
 906         return fd;
 907 }
 908
 909 static void signal_event_handler(struct task *t)
 910 {
 911         struct signal_task *st = t->private_data;
 912
 913         if (t->ret != -E_SIGNAL_CAUGHT)
 914                 PARA_ERROR_LOG("%s (ignored)\n", PARA_STRERROR(-t->ret));
 915         else
 916                 handle_signal(st->signum);
 917 }
 918
 919 static void signal_pre_select(struct sched *s, struct task *t)
 920 {
 921         struct signal_task *st = t->private_data;
 922         t->ret = 1;
 923         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 924 }
 925
 926 static void signal_post_select(struct sched *s, struct task *t)
 927 {
 928         struct signal_task *st = t->private_data;
 929         t->ret = 1;
 930         if (!FD_ISSET(st->fd, &s->rfds))
 931                 return;
 932         t->ret = -E_SIGNAL_CAUGHT;
 933         st->signum = para_next_signal();
 934 }
 935
 936 static void signal_setup_default(struct signal_task *st)
 937 {
 938         st->task.pre_select = signal_pre_select;
 939         st->task.post_select = signal_post_select;
 940         st->task.private_data = st;
 941         sprintf(st->task.status, "signal task");
 942 }
 943
 944 static void command_pre_select(struct sched *s, struct task *t)
 945 {
 946         struct command_task *ct = t->private_data;
 947         t->ret = 1;
 948         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 949
 950 }
 951
 952 static void command_post_select(struct sched *s, struct task *t)
 953 {
 954         int ret;
 955         struct command_task *ct = t->private_data;
 956
 957         t->ret = 1; /* always successful */
 958         audiod_status_dump();
 959         if (!FD_ISSET(ct->fd, &s->rfds))
 960                 return;
 961         ret = handle_connect(ct->fd);
 962         if (ret < 0)
 963                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 964 }
 965
 966 static void init_command_task(struct command_task *ct)
 967 {
 968         ct->task.pre_select = command_pre_select;
 969         ct->task.post_select = command_post_select;
 970         ct->task.event_handler = NULL;
 971         ct->task.private_data = ct;
 972         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 973         sprintf(ct->task.status, "command task");
 974 }
 975
 976 static void client_task_event_handler(__a_unused struct task *t)
 977 {
 978         struct private_client_data *pcd = t->private_data;
 979         if (t->ret == -E_HANDSHAKE_COMPLETE)
 980                 return;
 981         unregister_task(t);
 982         pcd->eof = 1;
 983 }
 984
 985 static void status_event_handler(__a_unused struct task *t)
 986 {
 987         struct timeval delay = {1, 0};
 988         int i;
 989         struct status_task *st = t->private_data;
 990
 991         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-t->ret));
 992         close_stat_pipe();
 993         /* avoid busy loop if server is down */
 994         tv_add(now, &delay, &st->restart_barrier);
 995         FOR_EACH_AUDIO_FORMAT(i)
 996                 afi[i].restart_barrier = st->restart_barrier;
 997 }
 998
 999 static void status_pre_select(struct sched *s, struct task *t)
1000 {
1001         struct status_task *st = t->private_data;
1002         int argc = 2;
1003         char *argv[] = {"audiod", "stat", NULL};
1004         t->ret = 1;
1005         if (st->pcd && (audiod_status == AUDIOD_OFF || st->pcd->eof))
1006                 close_stat_pipe();
1007         if (!st->pcd && audiod_status != AUDIOD_OFF
1008                 && tv_diff(now, &st->restart_barrier, NULL) > 0) {
1009                 t->ret = client_parse_config(argc, argv, &st->pcd);
1010                 if (t->ret < 0)
1011                         return;
1012                 t->ret = client_open(st->pcd);
1013                 if (t->ret < 0)
1014                         return;
1015                 st->pcd->task.event_handler = client_task_event_handler;
1016                 s->timeout.tv_sec = 0;
1017                 s->timeout.tv_usec = 1;
1018         }
1019 }
1020
1021 static void status_post_select(__a_unused struct sched *s, struct task *t)
1022 {
1023         struct status_task *st = t->private_data;
1024
1025         t->ret = 1;
1026         if (!st->pcd || !st->pcd->loaded
1027                         || st->pcd->status != CL_RECEIVING)
1028                 return;
1029         st->pcd->loaded = for_each_line(st->pcd->buf, st->pcd->loaded,
1030                 &check_stat_line);
1031 }
1032
1033 static void init_status_task(struct status_task *st)
1034 {
1035         memset(st, 0, sizeof(struct status_task));
1036         st->task.pre_select = status_pre_select;
1037         st->task.post_select = status_post_select;
1038         st->task.event_handler = status_event_handler;
1039         st->task.private_data = st;
1040         st->sa_time_diff_sign = 1;
1041         sprintf(st->task.status, "status task");
1042 }
1043
1044 static void set_initial_status(void)
1045 {
1046         audiod_status = AUDIOD_ON;
1047         if (!conf.mode_given)
1048                 return;
1049         if (!strcmp(conf.mode_arg, "sb")) {
1050                 audiod_status = AUDIOD_STANDBY;
1051                 return;
1052         }
1053         if (!strcmp(conf.mode_arg, "off")) {
1054                 audiod_status = AUDIOD_OFF;
1055                 return;
1056         }
1057         if (strcmp(conf.mode_arg, "on"))
1058                 PARA_WARNING_LOG("%s", "invalid mode\n");
1059 }
1060
1061 int main(int argc, char *argv[])
1062 {
1063         char *cf;
1064         int ret, i;
1065         struct sched s;
1066         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1067         struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1068
1069         valid_fd_012();
1070         audiod_cmdline_parser(argc, argv, &conf);
1071         para_drop_privileges(conf.user_arg, conf.group_arg);
1072         cf = configfile_exists();
1073         if (cf) {
1074                 if (audiod_cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1075                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1076                         exit(EXIT_FAILURE);
1077                 }
1078         }
1079         if (conf.logfile_given)
1080                 logfile = open_log(conf.logfile_arg);
1081         log_welcome("para_audiod", conf.loglevel_arg);
1082         i = init_stream_io();
1083         if (i < 0) {
1084                 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1085                 exit(EXIT_FAILURE);
1086         }
1087         server_uptime(UPTIME_SET);
1088         set_initial_status();
1089         FOR_EACH_SLOT(i)
1090                 clear_slot(i);
1091         init_grabbing();
1092         setup_signal_handling();
1093         signal_setup_default(sig_task);
1094         sig_task->task.event_handler = signal_event_handler;
1095
1096         init_status_task(stat_task);
1097         init_command_task(cmd_task);
1098         init_audiod_task(audiod_task);
1099
1100         if (conf.daemon_given)
1101                 daemon_init();
1102
1103         register_task(&sig_task->task);
1104         register_task(&cmd_task->task);
1105         register_task(&stat_task->task);
1106         register_task(audiod_task);
1107         s.default_timeout.tv_sec = 0;
1108         s.default_timeout.tv_usec = 99 * 1000;
1109         ret = sched(&s);
1110
1111         PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1112         return EXIT_FAILURE;
1113 }