audiod.c

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