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