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 *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
  83 /**
  84  * the task for handling audiod commands
  85  *
  86  * \sa struct task, struct sched
  87  */
  88 struct command_task {
  89         /** the local listening socket */
  90         int fd;
  91         /** the associated task structure */
  92         struct task task;
  93 };
  94
  95 struct signal_task {
  96         int fd;
  97         int signum;
  98         struct task task;
  99 };
 100
 101 /** iterate over all supported audio formats */
 102 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 103
 104 /**
 105  * get the audio format number
 106  * \param name the name of the audio format
 107  *
 108  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 109  * \a name is not a supported audio format.
 110  */
 111 int get_audio_format_num(char *name)
 112 {
 113         int i;
 114         FOR_EACH_AUDIO_FORMAT(i)
 115                 if (!strcmp(name, audio_formats[i]))
 116                         return i;
 117         return -E_UNSUPPORTED_AUDIO_FORMAT;
 118 }
 119
 120 /*
 121  * log function. first argument is loglevel.
 122  */
 123 void para_log(int ll, const char* fmt,...)
 124 {
 125         va_list argp;
 126         FILE *outfd;
 127         struct tm *tm;
 128         time_t t1;
 129         char str[MAXLINE] = "";
 130         static char *hostname;
 131
 132         if (ll < conf.loglevel_arg)
 133                 return;
 134         if (!hostname)
 135                 hostname = para_hostname();
 136         outfd = logfile? logfile : stderr;
 137         time(&t1);
 138         tm = localtime(&t1);
 139         strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
 140         fprintf(outfd, "%s %s ", str, hostname);
 141         if (conf.loglevel_arg <= INFO)
 142                 fprintf(outfd, "%i ", ll);
 143         va_start(argp, fmt);
 144         vfprintf(outfd, fmt, argp);
 145         va_end(argp);
 146 }
 147
 148 static char *configfile_exists(void)
 149 {
 150         static char *config_file;
 151
 152         if (!config_file) {
 153                 char *home = para_homedir();
 154                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 155                 free(home);
 156         }
 157         return file_exists(config_file)? config_file : NULL;
 158 }
 159
 160 static void setup_signal_handling(void)
 161 {
 162         sig_task->fd = para_signal_init();
 163         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 164         para_install_sighandler(SIGINT);
 165         para_install_sighandler(SIGTERM);
 166         para_install_sighandler(SIGCHLD);
 167         para_install_sighandler(SIGHUP);
 168         para_install_sighandler(SIGPIPE);
 169 //      signal(SIGPIPE, SIG_IGN);
 170 }
 171
 172 static void clear_slot(int slot_num)
 173 {
 174         struct slot_info *s = &slot[slot_num];
 175
 176         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 177         memset(s, 0, sizeof(struct slot_info));
 178         s->format = -1;
 179 }
 180
 181 static void close_receiver(int slot_num)
 182 {
 183         struct slot_info *s = &slot[slot_num];
 184         struct audio_format_info *a;
 185         const struct timeval restart_delay = {0, 200 * 1000};
 186
 187         if (s->format < 0 || !s->receiver_node)
 188                 return;
 189         a = &afi[s->format];
 190         PARA_NOTICE_LOG("closing %s receiver in slot %d (eof = %d)\n",
 191                 audio_formats[s->format] , slot_num, s->receiver_node->eof);
 192 //      if (!s->receiver_node->eof)
 193 //              unregister_task(&s->receiver_node->task);
 194         a->receiver->close(s->receiver_node);
 195         free(s->receiver_node);
 196         s->receiver_node = NULL;
 197         /* set restart barrier */
 198         tv_add(now, &restart_delay, &afi[s->format].restart_barrier);
 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 int decoder_running(int format)
 246 {
 247         int i, ret = 0;
 248         struct slot_info *s;
 249
 250         FOR_EACH_SLOT(i) {
 251                 s = &slot[i];
 252                 if (s->format == format && s->receiver_node)
 253                         ret |= 1;
 254                 if (s->format == format && s->wng)
 255                         ret |= 2;
 256         }
 257         return ret;
 258 }
 259
 260 static void close_stat_pipe(void)
 261 {
 262         int i;
 263
 264         if (stat_task->fd < 0)
 265                 return;
 266         PARA_NOTICE_LOG("%s", "closing status pipe\n");
 267         close(stat_task->fd);
 268         del_close_on_fork_list(stat_task->fd);
 269         stat_task->fd = -1;
 270 //      kill_all_decoders();
 271         for (i = 0; i < NUM_STAT_ITEMS; i++) {
 272                 free(stat_task->stat_item_values[i]);
 273                 stat_task->stat_item_values[i] = NULL;
 274         }
 275         dump_empty_status();
 276         stat_task->length_seconds = 0;
 277         stat_task->offset_seconds = 0;
 278         audiod_status_dump();
 279         stat_task->playing = 0;
 280         stat_task->stat_item_values[SI_STATUS_BAR] = make_message(
 281                 "%s:no connection to para_server\n",
 282                 status_item_list[SI_STATUS_BAR]);
 283         stat_client_write(stat_task->stat_item_values[SI_STATUS_BAR], SI_STATUS_BAR);
 284 }
 285
 286 void __noreturn clean_exit(int status, const char *msg)
 287 {
 288         PARA_EMERG_LOG("%s\n", msg);
 289         if (socket_name)
 290                 unlink(socket_name);
 291         if (stat_task->fd >= 0)
 292                 close_stat_pipe();
 293         exit(status);
 294 }
 295
 296 /**
 297  * get the number of filters
 298  *
 299  * \param audio_format_num the number identifying the audio format
 300  *
 301  * \return the number of filters for the given audio format
 302  *
 303  * \sa struct filter;
 304  */
 305 int num_filters(int audio_format_num)
 306 {
 307         return afi[audio_format_num].num_filters;
 308 }
 309
 310 static void filter_event_handler(struct task *t)
 311 {
 312         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 313         struct filter_chain *fc = t->private_data;
 314         fc->eof = 1;
 315         unregister_task(t);
 316 }
 317
 318 static void open_filters(int slot_num)
 319 {
 320         struct slot_info *s = &slot[slot_num];
 321         struct audio_format_info *a = &afi[s->format];
 322         int nf = a->num_filters;
 323         int i;
 324
 325         s->fc = NULL;
 326         if (!nf)
 327                 return;
 328         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 329         s->fc = para_calloc(sizeof(struct filter_chain));
 330         INIT_LIST_HEAD(&s->fc->filters);
 331         s->fc->inbuf = s->receiver_node->buf;
 332         s->fc->in_loaded = &s->receiver_node->loaded;
 333         s->fc->input_eof = &s->receiver_node->eof;
 334         s->fc->task.pre_select = filter_pre_select;
 335         s->fc->task.event_handler = filter_event_handler;
 336         s->fc->task.private_data = s->fc;
 337         s->fc->eof = 0;
 338
 339         s->receiver_node->output_eof = &s->fc->eof;
 340         sprintf(s->fc->task.status, "filter chain");
 341         for (i = 0; i < nf; i++) {
 342                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 343                 fn->conf = a->filter_conf[i];
 344                 fn->fc = s->fc;
 345                 fn->filter = a->filters[i];
 346                 INIT_LIST_HEAD(&fn->callbacks);
 347                 list_add_tail(&fn->node, &s->fc->filters);
 348                 fn->filter->open(fn);
 349                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 350                         audio_formats[s->format], i + 1,  nf,
 351                         fn->filter->name, slot_num);
 352                 s->fc->outbuf = fn->buf;
 353                 s->fc->out_loaded = &fn->loaded;
 354         }
 355         register_task(&s->fc->task);
 356 }
 357
 358 static void wng_event_handler(struct task *t)
 359 {
 360         struct writer_node_group *wng = t->private_data;
 361
 362         PARA_INFO_LOG("%s\n", PARA_STRERROR(-t->ret));
 363         wng->eof = 1;
 364         wng_unregister(wng);
 365 }
 366
 367 static void open_writers(int slot_num)
 368 {
 369         int ret, i;
 370         struct slot_info *s = &slot[slot_num];
 371         struct audio_format_info *a = &afi[s->format];
 372
 373         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 374         if (!a->num_writers)
 375                 s->wng = setup_default_wng();
 376         else
 377                 s->wng = wng_new(a->num_writers);
 378         if (s->fc) {
 379                 s->wng->buf = s->fc->outbuf;
 380                 s->wng->loaded = s->fc->out_loaded;
 381                 s->wng->input_eof = &s->fc->eof;
 382                 s->wng->channels = &s->fc->channels;
 383                 s->wng->samplerate = &s->fc->samplerate;
 384                 s->fc->output_eof = &s->wng->eof;
 385                 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
 386         } else {
 387                 s->wng->buf = s->receiver_node->buf;
 388                 s->wng->loaded = &s->receiver_node->loaded;
 389                 s->wng->input_eof = &s->receiver_node->eof;
 390         }
 391         s->wng->task.event_handler = wng_event_handler;
 392         for (i = 0; i < a->num_writers; i++) {
 393                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 394                 s->wng->writer_nodes[i].writer = a->writers[i];
 395         }
 396         ret = wng_open(s->wng);
 397         if (ret < 0) {
 398                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 399                 return;
 400         }
 401         s->wstime = *now;
 402         activate_inactive_grab_clients(slot_num, s->format, &s->fc->filters);
 403 }
 404
 405 static void rn_event_handler(struct task *t)
 406 {
 407         struct receiver_node *rn = t->private_data;
 408
 409         PARA_NOTICE_LOG("%s\n", PARA_STRERROR(-t->ret));
 410         unregister_task(t);
 411         rn->eof = 1;
 412 }
 413
 414 static void open_receiver(int format)
 415 {
 416         struct audio_format_info *a = &afi[format];
 417         struct slot_info *s;
 418         int ret, slot_num;
 419         struct receiver_node *rn;
 420
 421         slot_num = get_empty_slot();
 422         if (slot_num < 0)
 423                 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
 424         s = &slot[slot_num];
 425         s->format = format;
 426         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 427         rn = s->receiver_node;
 428         rn->receiver = a->receiver;
 429         rn->conf = a->receiver_conf;
 430         ret = a->receiver->open(s->receiver_node);
 431         if (ret < 0) {
 432                 PARA_ERROR_LOG("failed to open receiver (%s)\n",
 433                         PARA_STRERROR(-ret));
 434                 free(s->receiver_node);
 435                 s->receiver_node = NULL;
 436                 return;
 437         }
 438         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 439                 audio_formats[s->format], a->receiver->name, slot_num);
 440         rn->task.private_data = s->receiver_node;
 441         rn->task.pre_select = a->receiver->pre_select;
 442         rn->task.post_select = a->receiver->post_select;
 443         rn->task.event_handler = rn_event_handler;
 444         sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
 445         register_task(&rn->task);
 446 }
 447
 448 static int open_current_receiver(struct sched *s)
 449 {
 450         int i;
 451         struct timeval diff;
 452
 453         if (!stat_task->af_status)
 454                 return 0;
 455         i = get_audio_format_num(stat_task->af_status);
 456         if (i < 0)
 457                 return 0;
 458         if (decoder_running(i))
 459                 return 0;
 460         if (tv_diff(now, &afi[i].restart_barrier, &diff) < 0) {
 461                 s->timeout = diff;
 462                 return 0;
 463         }
 464         open_receiver(i);
 465         return 1;
 466 }
 467
 468 static void compute_time_diff(const struct timeval *status_time)
 469 {
 470         struct timeval tmp, diff;
 471         static int count;
 472         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 473         const struct timeval max_deviation = {0, 500 * 1000};
 474         const int time_smooth = 5;
 475
 476         sign = tv_diff(status_time, now, &diff);
 477 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 478 //                      sign, sa_time_diff_sign);
 479         if (!count) {
 480                 sa_time_diff_sign = sign;
 481                 stat_task->sa_time_diff = diff;
 482                 count++;
 483                 return;
 484         }
 485         if (count > 5) {
 486                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 487                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 488                         PARA_WARNING_LOG("time diff jump: %lims\n",
 489                                 s * tv2ms(&tmp));
 490         }
 491         count++;
 492         sa_time_diff_sign = tv_convex_combination(
 493                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 494                 count > 10? sign : sign * time_smooth, &diff,
 495                 &tmp);
 496         stat_task->sa_time_diff = tmp;
 497         PARA_DEBUG_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 498                 sign > 0? "+" : "-",
 499                 tv2ms(&diff),
 500                 sa_time_diff_sign ? "+" : "-",
 501                 tv2ms(&stat_task->sa_time_diff)
 502         );
 503 }
 504
 505 static void check_stat_line(char *line)
 506 {
 507         int itemnum;
 508         size_t ilen = 0;
 509         long unsigned sec, usec;
 510         char *tmp;
 511
 512 //      PARA_INFO_LOG("line: %s\n", line);
 513         if (!line)
 514                 return;
 515         itemnum = stat_line_valid(line);
 516         if (itemnum < 0) {
 517                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 518                 return;
 519         }
 520         tmp = make_message("%s\n", line);
 521         stat_client_write(tmp, itemnum);
 522         free(tmp);
 523         free(stat_task->stat_item_values[itemnum]);
 524         stat_task->stat_item_values[itemnum] = para_strdup(line);
 525         ilen = strlen(status_item_list[itemnum]);
 526         switch (itemnum) {
 527         case SI_STATUS:
 528                 stat_task->playing = strstr(line, "playing")? 1 : 0;
 529                 break;
 530         case SI_FORMAT:
 531                 free(stat_task->af_status);
 532                 stat_task->af_status = para_strdup(line + ilen + 1);
 533                 break;
 534         case SI_OFFSET:
 535                 stat_task->offset_seconds = atoi(line + ilen + 1);
 536                 break;
 537         case SI_LENGTH:
 538                 stat_task->length_seconds = atoi(line + ilen + 1);
 539                 break;
 540         case SI_STREAM_START:
 541                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 542                         stat_task->server_stream_start.tv_sec = sec;
 543                         stat_task->server_stream_start.tv_usec = usec;
 544                 }
 545                 break;
 546         case SI_CURRENT_TIME:
 547                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 548                         struct timeval tv = {sec, usec};
 549                         compute_time_diff(&tv);
 550                 }
 551                 break;
 552         }
 553 }
 554
 555 static void handle_signal(int sig)
 556 {
 557         switch (sig) {
 558         case SIGCHLD:
 559                 for (;;) {
 560                         pid_t pid = para_reap_child();
 561                         if (pid <= 0)
 562                                 return;
 563                         PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
 564                 }
 565         case SIGINT:
 566         case SIGTERM:
 567         case SIGHUP:
 568                 PARA_EMERG_LOG("terminating on signal %d\n", sig);
 569                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 570                 return;
 571         }
 572 }
 573
 574 static void try_to_close_slot(int slot_num)
 575 {
 576         struct slot_info *s = &slot[slot_num];
 577
 578         if (s->format < 0)
 579                 return;
 580         if (s->receiver_node && !s->receiver_node->eof)
 581                 return;
 582         if (s->fc && !s->fc->eof)
 583                 return;
 584         if (s->wng && !s->wng->eof)
 585                 return;
 586         PARA_INFO_LOG("closing slot %d \n", slot_num);
 587         wng_close(s->wng);
 588         close_filters(s->fc);
 589         free(s->fc);
 590         close_receiver(slot_num);
 591         clear_slot(slot_num);
 592 }
 593
 594 /*
 595  * Check if any receivers/filters/writers need to be started and do so if
 596  * neccessary.  Since the pre_select function didn't have a chance yet to put
 597  * file descriptors into the fd sets given by s, make the upcoming select()
 598  * return immediately to avoid a long timeout in case we started something.
 599  */
 600 static void audiod_pre_select(struct sched *s, __a_unused struct task *t)
 601 {
 602         int i;
 603         struct timeval min_delay = {0, 1};
 604
 605         t->ret = 1;
 606         if (audiod_status != AUDIOD_ON || !stat_task->playing)
 607                 return kill_all_decoders();
 608         if (open_current_receiver(s))
 609                 s->timeout = min_delay;
 610         FOR_EACH_SLOT(i) {
 611                 struct slot_info *sl = &slot[i];
 612                 struct audio_format_info *a;
 613
 614                 if (sl->format < 0)
 615                         continue;
 616                 a = &afi[sl->format];
 617                 if (!sl->receiver_node)
 618                         continue;
 619                 if (!a->num_filters) {
 620                         if (sl->receiver_node->loaded && !sl->wng) {
 621                                 open_writers(i);
 622                                 s->timeout = min_delay;
 623                         }
 624                         continue;
 625                 }
 626                 if (sl->receiver_node->loaded && !sl->fc) {
 627                         open_filters(i);
 628                         s->timeout = min_delay;
 629                         continue;
 630                 }
 631                 if (sl->fc && *sl->fc->out_loaded && !sl->wng) {
 632                         open_writers(i);
 633                         s->timeout = min_delay;
 634                 }
 635         }
 636 }
 637
 638 static void audiod_post_select(__a_unused struct sched *s,
 639         __a_unused struct task *t)
 640 {
 641         int i;
 642
 643         /* save away the current time for other users */
 644         t->ret = 1;
 645         FOR_EACH_SLOT(i)
 646                 try_to_close_slot(i);
 647 }
 648
 649 static void init_audiod_task(struct task *t)
 650 {
 651         t->pre_select = audiod_pre_select;
 652         t->post_select = audiod_post_select;
 653         t->event_handler = NULL;
 654         t->private_data = t;
 655         sprintf(t->status, "audiod task");
 656 }
 657
 658 static int parse_stream_command(const char *txt, char **cmd)
 659 {
 660         char *p = strchr(txt, ':');
 661         int i;
 662
 663         if (!p)
 664                 return -E_MISSING_COLON;
 665         p++;
 666         FOR_EACH_AUDIO_FORMAT(i) {
 667                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 668                         continue;
 669                 *cmd = p;
 670                 return i;
 671         }
 672         return -E_UNSUPPORTED_AUDIO_FORMAT;
 673 }
 674
 675 static int add_filter(int format, char *cmdline)
 676 {
 677         struct audio_format_info *a = &afi[format];
 678         int filter_num, nf = a->num_filters;
 679
 680         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 681         if (filter_num < 0)
 682                 return filter_num;
 683         a->filters[nf] = &filters[filter_num];
 684         a->num_filters++;
 685         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
 686                 a->filters[nf]->name);
 687         return filter_num;
 688 }
 689
 690 static int init_writers(void)
 691 {
 692         int i, ret, nw;
 693         char *cmd;
 694         struct audio_format_info *a;
 695
 696         init_supported_writers();
 697         nw = PARA_MAX(1, conf.writer_given);
 698         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 699         FOR_EACH_AUDIO_FORMAT(i) {
 700                 a = &afi[i];
 701                 a->writer_conf = para_malloc(nw * sizeof(void *));
 702                 a->writers = para_malloc(nw * sizeof(struct writer *));
 703                 a->num_writers = 0;
 704         }
 705         for (i = 0; i < conf.writer_given; i++) {
 706                 void *wconf;
 707                 int writer_num;
 708                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 709                 if (ret < 0)
 710                         goto out;
 711                 a = &afi[ret];
 712                 nw = a->num_writers;
 713                 wconf = check_writer_arg(cmd, &writer_num);
 714                 if (!wconf) {
 715                         ret = writer_num;
 716                         goto out;
 717                 }
 718                 a->writers[nw] = &writers[writer_num];
 719                 a->writer_conf[nw] = wconf;
 720                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 721                         nw, writer_names[writer_num]);
 722                 a->num_writers++;
 723         }
 724         ret = 1;
 725 out:
 726         return ret;
 727 }
 728
 729 static int init_receivers(void)
 730 {
 731         int i, ret, receiver_num;
 732         char *cmd = NULL;
 733         struct audio_format_info *a;
 734
 735         for (i = 0; receivers[i].name; i++) {
 736                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
 737                 receivers[i].init(&receivers[i]);
 738         }
 739         for (i = 0; i < conf.receiver_given; i++) {
 740                 char *arg = conf.receiver_arg[i];
 741                 char *recv = strchr(arg, ':');
 742                 ret = -E_MISSING_COLON;
 743                 if (!recv)
 744                         goto out;
 745                 *recv = '\0';
 746                 recv++;
 747                 ret = get_audio_format_num(arg);
 748                 if (ret < 0)
 749                         goto out;
 750                 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
 751                 if (!afi[ret].receiver_conf) {
 752                         ret = -E_RECV_SYNTAX;
 753                         goto out;
 754                 }
 755                 afi[ret].receiver = &receivers[receiver_num];
 756         }
 757         /* use the first available receiver with no arguments
 758          * for those audio formats for which no receiver
 759          * was specified
 760          */
 761         cmd = para_strdup(receivers[0].name);
 762         FOR_EACH_AUDIO_FORMAT(i) {
 763                 a = &afi[i];
 764                 if (a->receiver_conf)
 765                         continue;
 766                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 767                 if (!a->receiver_conf)
 768                         return -E_RECV_SYNTAX;
 769                 a->receiver = &receivers[receiver_num];
 770         }
 771         ret = 1;
 772 out:
 773         free(cmd);
 774         return ret;
 775 }
 776
 777 static int init_default_filters(void)
 778 {
 779         int i, ret = 1;
 780
 781         FOR_EACH_AUDIO_FORMAT(i) {
 782                 struct audio_format_info *a = &afi[i];
 783                 char *tmp;
 784                 int j;
 785
 786                 if (a->num_filters)
 787                         continue; /* no default -- nothing to to */
 788                 /* add "dec" to audio format name */
 789                 tmp = make_message("%sdec", audio_formats[i]);
 790                 for (j = 0; filters[j].name; j++)
 791                         if (!strcmp(tmp, filters[j].name))
 792                                 break;
 793                 free(tmp);
 794                 ret = -E_UNSUPPORTED_FILTER;
 795                 if (!filters[j].name)
 796                         goto out;
 797                 tmp = para_strdup(filters[j].name);
 798                 ret = add_filter(i, tmp);
 799                 free(tmp);
 800                 if (ret < 0)
 801                         goto out;
 802                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 803                         filters[j].name);
 804         }
 805 out:
 806         return ret;
 807 }
 808
 809 static int init_filters(void)
 810 {
 811         int i, ret, nf;
 812
 813         filter_init(filters);
 814         nf = PARA_MAX(1,  conf.filter_given);
 815         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 816         FOR_EACH_AUDIO_FORMAT(i) {
 817                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 818                 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
 819         }
 820         if (!conf.no_default_filters_given)
 821                 return init_default_filters();
 822         for (i = 0; i < conf.filter_given; i++) {
 823                 char *arg = conf.filter_arg[i];
 824                 char *filter_name = strchr(arg, ':');
 825                 ret = -E_MISSING_COLON;
 826                 if (!filter_name)
 827                         goto out;
 828                 *filter_name = '\0';
 829                 filter_name++;
 830                 ret = get_audio_format_num(arg);
 831                 if (ret < 0)
 832                         goto out;
 833                 ret = add_filter(ret, filter_name);
 834                 if (ret < 0)
 835                         goto out;
 836         }
 837         ret = init_default_filters(); /* use default values for the rest */
 838 out:
 839         return ret;
 840 }
 841
 842 static int init_stream_io(void)
 843 {
 844         int ret;
 845
 846         ret = init_writers();
 847         if (ret < 0)
 848                 return ret;
 849         ret = init_receivers();
 850         if (ret < 0)
 851                 return ret;
 852         ret = init_filters();
 853         if (ret < 0)
 854                 return ret;
 855         return 1;
 856 }
 857
 858 static int audiod_get_socket(void)
 859 {
 860         struct sockaddr_un unix_addr;
 861         int fd;
 862
 863         if (conf.socket_given)
 864                 socket_name = para_strdup(conf.socket_arg);
 865         else {
 866                 char *hn = para_hostname();
 867                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 868                         hn);
 869                 free(hn);
 870         }
 871         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 872         if (conf.force_given)
 873                 unlink(socket_name);
 874         fd = create_pf_socket(socket_name, &unix_addr,
 875                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 876         if (fd < 0) {
 877                 PARA_EMERG_LOG("%s", "can not connect to socket\n");
 878                 exit(EXIT_FAILURE); /* do not unlink socket */
 879         }
 880         if (listen(fd , 5) < 0) {
 881                 PARA_EMERG_LOG("%s", "can not listen on socket\n");
 882                 exit(EXIT_FAILURE); /* do not unlink socket */
 883         }
 884         add_close_on_fork_list(fd);
 885         return fd;
 886 }
 887
 888 static int open_stat_pipe(void)
 889 {
 890         int ret, fd[3] = {-1, 1, 0};
 891         pid_t pid;
 892         ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
 893         if (ret >= 0) {
 894                 ret = fd[1];
 895                 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
 896                 add_close_on_fork_list(ret);
 897         } else
 898                 clean_exit(EXIT_FAILURE, "failed to open status pipe");
 899         return ret;
 900 }
 901
 902 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 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 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 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         if (audiod_status != AUDIOD_OFF)
 952                 audiod_status_dump();
 953         if (!FD_ISSET(ct->fd, &s->rfds))
 954                 return;
 955         ret = handle_connect(ct->fd);
 956         if (ret < 0)
 957                 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
 958 }
 959
 960 static void init_command_task(struct command_task *ct)
 961 {
 962         ct->task.pre_select = command_pre_select;
 963         ct->task.post_select = command_post_select;
 964         ct->task.event_handler = NULL;
 965         ct->task.private_data = ct;
 966         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 967         sprintf(ct->task.status, "command task");
 968 }
 969
 970 static void status_event_handler(__a_unused struct task *t)
 971 {
 972         struct timeval delay = {1, 0};
 973         int i;
 974         struct status_task *st = t->private_data;
 975
 976         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-t->ret));
 977         close_stat_pipe();
 978         /* avoid busy loop if server is down */
 979         tv_add(now, &delay, &st->restart_barrier);
 980         FOR_EACH_AUDIO_FORMAT(i)
 981                 afi[i].restart_barrier = st->restart_barrier;
 982 }
 983
 984 static void status_pre_select(struct sched *s, struct task *t)
 985 {
 986         struct status_task *st = t->private_data;
 987         t->ret = 1;
 988         if (st->fd >= 0 && audiod_status == AUDIOD_OFF)
 989                 close_stat_pipe();
 990         if (st->fd < 0 && audiod_status != AUDIOD_OFF
 991                 && tv_diff(now, &st->restart_barrier, NULL) > 0) {
 992                 st->fd = open_stat_pipe();
 993                 st->loaded = 0;
 994                 st->buf[0] = '\0';
 995         }
 996         if (st->fd >= 0 && audiod_status != AUDIOD_OFF)
 997                 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 998 }
 999
1000 static void status_post_select(struct sched *s, struct task *t)
1001 {
1002         struct status_task *st = t->private_data;
1003
1004         t->ret = 1;
1005         if (st->fd < 0 || !FD_ISSET(st->fd, &s->rfds))
1006                 return;
1007         t->ret = read(st->fd, st->buf + st->loaded, STRINGSIZE - 1 - st->loaded);
1008         if (t->ret <= 0) {
1009                 if (!t->ret)
1010                         t->ret = -E_STATUS_EOF;
1011                 return;
1012         }
1013         st->buf[t->ret + st->loaded] = '\0';
1014         st->loaded = for_each_line(st->buf, t->ret + st->loaded,
1015                 &check_stat_line);
1016 }
1017
1018 static void init_status_task(struct status_task *st)
1019 {
1020         memset(st, 0, sizeof(struct status_task));
1021         st->task.pre_select = status_pre_select;
1022         st->task.post_select = status_post_select;
1023         st->task.event_handler = status_event_handler;
1024         st->task.private_data = st;
1025         st->fd = -1;
1026         st->sa_time_diff_sign = 1;
1027         sprintf(st->task.status, "status task");
1028 }
1029
1030 static void set_initial_status(void)
1031 {
1032         audiod_status = AUDIOD_ON;
1033         if (!conf.mode_given)
1034                 return;
1035         if (!strcmp(conf.mode_arg, "sb")) {
1036                 audiod_status = AUDIOD_STANDBY;
1037                 return;
1038         }
1039         if (!strcmp(conf.mode_arg, "off")) {
1040                 audiod_status = AUDIOD_OFF;
1041                 return;
1042         }
1043         if (strcmp(conf.mode_arg, "on"))
1044                 PARA_WARNING_LOG("%s", "invalid mode\n");
1045 }
1046
1047 int main(int argc, char *argv[])
1048 {
1049         char *cf;
1050         int ret, i;
1051         struct sched s;
1052         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1053         struct task audiod_task_struct, *audiod_task = &audiod_task_struct;
1054
1055         init_sched();
1056
1057         valid_fd_012();
1058         cmdline_parser(argc, argv, &conf);
1059         para_drop_privileges(conf.user_arg, conf.group_arg);
1060         cf = configfile_exists();
1061         if (cf) {
1062                 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1063                         PARA_EMERG_LOG("%s", "parse error in config file\n");
1064                         exit(EXIT_FAILURE);
1065                 }
1066         }
1067         if (conf.logfile_given)
1068                 logfile = open_log(conf.logfile_arg);
1069         log_welcome("para_audiod", conf.loglevel_arg);
1070         i = init_stream_io();
1071         if (i < 0) {
1072                 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1073                 exit(EXIT_FAILURE);
1074         }
1075         server_uptime(UPTIME_SET);
1076         set_initial_status();
1077         FOR_EACH_SLOT(i)
1078                 clear_slot(i);
1079         init_grabbing();
1080         setup_signal_handling();
1081         signal_setup_default(sig_task);
1082         sig_task->task.event_handler = signal_event_handler;
1083
1084         init_status_task(stat_task);
1085         init_command_task(cmd_task);
1086         init_audiod_task(audiod_task);
1087
1088         if (conf.daemon_given)
1089                 daemon_init();
1090
1091         register_task(&sig_task->task);
1092         register_task(&cmd_task->task);
1093         register_task(&stat_task->task);
1094         register_task(audiod_task);
1095         s.default_timeout.tv_sec = 3;
1096         s.default_timeout.tv_usec = 99 * 1000;
1097         ret = sched(&s);
1098
1099         PARA_EMERG_LOG("%s\n", PARA_STRERROR(-ret));
1100         return EXIT_FAILURE;
1101 }