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