audiod.c

   1 /*
   2  * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file audiod.c the paraslash's audio daemon */
   8 #include <sys/types.h>
   9 #include <dirent.h>
  10 #include <signal.h>
  11
  12 #include "para.h"
  13 #include "error.h"
  14 #include "audiod.cmdline.h"
  15 #include "list.h"
  16 #include "sched.h"
  17 #include "ggo.h"
  18 #include "recv.h"
  19 #include "filter.h"
  20 #include "grab_client.cmdline.h"
  21 #include "grab_client.h"
  22 #include "client.cmdline.h"
  23 #include "client.h"
  24 #include "audiod.h"
  25 #include "net.h"
  26 #include "daemon.h"
  27 #include "string.h"
  28 #include "fd.h"
  29 #include "write.h"
  30 #include "write_common.h"
  31 #include "signal.h"
  32
  33 /** define the array of error lists needed by para_audiod */
  34 INIT_AUDIOD_ERRLISTS;
  35 /** define the array containing all supported audio formats */
  36 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
  37
  38 /** Defines how audiod handles one supported audio format. */
  39 struct audio_format_info {
  40         /** pointer to the receiver for this audio format */
  41         struct receiver *receiver;
  42         /** the receiver configuration */
  43         void *receiver_conf;
  44         /** the number of filters that should be activated for this audio format */
  45         unsigned int num_filters;
  46         /** Array of filter numbers to be activated. */
  47         unsigned *filter_nums;
  48         /** Pointer to the array of filter configurations. */
  49         void **filter_conf;
  50         /** the number of filters that should be activated for this audio format */
  51         unsigned int num_writers;
  52         /** pointer to the array of writers to be activated */
  53         struct writer **writers;
  54         /** pointer to the array of writer configurations */
  55         void **writer_conf;
  56         /** do not start receiver/filters/writer before this time */
  57         struct timeval restart_barrier;
  58 };
  59
  60 /**
  61  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
  62  * be associated with a receiver/filter/writer triple. This array holds all
  63  * information on the status of these slots.
  64  *
  65  * \sa struct slot_info
  66  * */
  67 struct slot_info slot[MAX_STREAM_SLOTS];
  68
  69 /**
  70  * The task for obtaining para_server's status (para_client stat).
  71  *
  72  * \sa struct task, struct sched.
  73  */
  74 struct status_task {
  75         /** The associated task structure of audiod. */
  76         struct task task;
  77         /** Client data associated with the stat task. */
  78         struct client_task *ct;
  79         /** Do not restart client command until this time. */
  80         struct timeval restart_barrier;
  81         /** Last time we received status data from para_server. */
  82         struct timeval last_status_read;
  83         /** The offset value announced by para_server. */
  84         int offset_seconds;
  85         /** The length of the current audio file as announced by para_server. */
  86         int length_seconds;
  87         /** The start of the current stream from the view of para_server. */
  88         struct timeval server_stream_start;
  89         /** The average time deviation between para_server and para_audiod. */
  90         struct timeval sa_time_diff;
  91         /** Whether client time is ahead of server time. */
  92         int sa_time_diff_sign;
  93         /** Non-zero if para_server's status is "playing". */
  94         int playing;
  95         /** Number of times the clock difference is to be checked. */
  96         unsigned clock_diff_count;
  97         /** When to start the next check for clock difference. */
  98         struct timeval clock_diff_barrier;
  99         /** Number of the audio format as announced by para_server. */
 100         int current_audio_format_num;
 101 };
 102
 103 /** The array of status items sent by para_server. */
 104 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
 105
 106 /**
 107  * the current mode of operation of which can be changed by the on/off/cycle
 108  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
 109  */
 110 int audiod_status = AUDIOD_ON;
 111
 112 /**
 113  * the gengetopt args_info struct that holds information on all command line
 114  * arguments
 115  */
 116 struct audiod_args_info conf;
 117
 118 static char *socket_name;
 119 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 120
 121 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
 122
 123 static struct status_task status_task_struct;
 124
 125 /**
 126  * the task that calls the status command of para_server
 127  *
 128  * \sa struct status_task
 129  */
 130 static struct status_task *stat_task = &status_task_struct;
 131 static struct timeval initial_delay_barrier;
 132
 133 /**
 134  * the task for handling audiod commands
 135  *
 136  * \sa struct task, struct sched
 137  */
 138 struct command_task {
 139         /** the local listening socket */
 140         int fd;
 141         /** the associated task structure */
 142         struct task task;
 143 };
 144
 145 /** iterate over all supported audio formats */
 146 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 147
 148 /**
 149  * get the audio format number
 150  * \param name the name of the audio format
 151  *
 152  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 153  * \a name is not a supported audio format.
 154  */
 155 int get_audio_format_num(char *name)
 156 {
 157         int i;
 158
 159         while (para_isspace(*name))
 160                 name++;
 161         FOR_EACH_AUDIO_FORMAT(i)
 162                 if (!strcmp(name, audio_formats[i]))
 163                         return i;
 164         return -E_UNSUPPORTED_AUDIO_FORMAT;
 165 }
 166
 167 char *get_time_string(struct timeval *newest_stime)
 168 {
 169         struct timeval diff, adj_stream_start, tmp;
 170         int total = 0, use_server_time = 1,
 171                 length_seconds = stat_task->length_seconds;
 172
 173         if (!stat_task->playing) {
 174                 if (length_seconds)
 175                         return NULL;
 176                 return make_message("%s:\n", status_item_list[SI_PLAY_TIME]);
 177         }
 178         if (audiod_status == AUDIOD_OFF)
 179                 goto out;
 180         if (stat_task->sa_time_diff_sign > 0)
 181                 tv_diff(&stat_task->server_stream_start, &stat_task->sa_time_diff,
 182                         &adj_stream_start);
 183         else
 184                 tv_add(&stat_task->server_stream_start, &stat_task->sa_time_diff,
 185                         &adj_stream_start);
 186         tmp = adj_stream_start;
 187         if (newest_stime && audiod_status == AUDIOD_ON) {
 188                 tv_diff(newest_stime, &adj_stream_start, &diff);
 189                 if (tv2ms(&diff) < 5000) {
 190                         tmp = *newest_stime;
 191                         use_server_time = 0;
 192                 }
 193         }
 194         tv_diff(now, &tmp, &diff);
 195         total = diff.tv_sec + stat_task->offset_seconds;
 196         if (total > length_seconds)
 197                 total = length_seconds;
 198         if (total < 0)
 199                 total = 0;
 200 out:
 201         return make_message(
 202                 "%s: %s%d:%02d [%d:%02d] (%d%%/%d:%02d)\n",
 203                 status_item_list[SI_PLAY_TIME],
 204                 use_server_time? "~" : "",
 205                 total / 60,
 206                 total % 60,
 207                 (length_seconds - total) / 60,
 208                 (length_seconds - total) % 60,
 209                 length_seconds? (total * 100 + length_seconds / 2) /
 210                         length_seconds : 0,
 211                 length_seconds / 60,
 212                 length_seconds % 60
 213         );
 214 }
 215
 216 static int want_colors(void)
 217 {
 218         if (conf.color_arg == color_arg_no)
 219                 return 0;
 220         if (conf.color_arg == color_arg_yes)
 221                 return 1;
 222         if (conf.logfile_given)
 223                 return 0;
 224         return isatty(STDERR_FILENO);
 225 }
 226
 227 static void parse_config_or_die(void)
 228 {
 229         int ret;
 230         char *config_file;
 231         struct audiod_cmdline_parser_params params = {
 232                 .override = 0,
 233                 .initialize = 0,
 234                 .check_required = 1,
 235                 .check_ambiguity = 0,
 236                 .print_errors = 1
 237         };
 238
 239         if (conf.config_file_given)
 240                 config_file = para_strdup(conf.config_file_arg);
 241         else {
 242                 char *home = para_homedir();
 243                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 244                 free(home);
 245         }
 246         ret = file_exists(config_file);
 247         if (conf.config_file_given && !ret) {
 248                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
 249                 goto err;
 250         }
 251         if (ret)
 252                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
 253         free(config_file);
 254         daemon_set_loglevel(conf.loglevel_arg);
 255         return;
 256 err:
 257         free(config_file);
 258         exit(EXIT_FAILURE);
 259 }
 260
 261 static void setup_signal_handling(void)
 262 {
 263         sig_task->fd = para_signal_init();
 264         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
 265         para_install_sighandler(SIGINT);
 266         para_install_sighandler(SIGTERM);
 267         para_install_sighandler(SIGHUP);
 268         signal(SIGPIPE, SIG_IGN);
 269 }
 270
 271 static void clear_slot(int slot_num)
 272 {
 273         struct slot_info *s = &slot[slot_num];
 274
 275         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 276         memset(s, 0, sizeof(struct slot_info));
 277         s->format = -1;
 278 }
 279
 280 static void close_receiver(int slot_num)
 281 {
 282         struct slot_info *s = &slot[slot_num];
 283         struct audio_format_info *a;
 284
 285         if (s->format < 0 || !s->receiver_node)
 286                 return;
 287         a = &afi[s->format];
 288         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
 289                 audio_formats[s->format], slot_num);
 290         a->receiver->close(s->receiver_node);
 291         free(s->receiver_node);
 292         s->receiver_node = NULL;
 293 }
 294
 295 static void kill_all_decoders(int error)
 296 {
 297         int i;
 298
 299         FOR_EACH_SLOT(i) {
 300                 struct slot_info *s = &slot[i];
 301                 if (s->wng && s->wng->task.error >= 0) {
 302                         PARA_INFO_LOG("deactivating wng in slot %d\n",
 303                                 i);
 304                         s->wng->task.error = error;
 305                 }
 306                 if (s->fc && s->fc->task.error >= 0) {
 307                         PARA_INFO_LOG("deactivatimg filter chain in slot %d\n", i);
 308                         s->fc->task.error = error;
 309                 }
 310                 if (s->receiver_node && s->receiver_node->task.error >= 0) {
 311                         PARA_INFO_LOG("deactivating receiver_node in slot %d\n", i);
 312                         s->receiver_node->task.error = error;
 313                 }
 314         }
 315 }
 316
 317 static int get_empty_slot(void)
 318 {
 319         int i;
 320         struct slot_info *s;
 321
 322         FOR_EACH_SLOT(i) {
 323                 s = &slot[i];
 324                 if (s->format < 0) {
 325                         clear_slot(i);
 326                         return i;
 327                 }
 328                 if (s->wng || s->receiver_node || s->fc)
 329                         continue;
 330                 clear_slot(i);
 331                 return i;
 332         }
 333         return -E_NO_MORE_SLOTS;
 334 }
 335
 336 /**
 337  * get the number of filters
 338  *
 339  * \param audio_format_num the number identifying the audio format
 340  *
 341  * \return the number of filters for the given audio format
 342  *
 343  * \sa struct filter;
 344  */
 345 int num_filters(int audio_format_num)
 346 {
 347         return afi[audio_format_num].num_filters;
 348 }
 349
 350 static void open_filters(int slot_num)
 351 {
 352         struct slot_info *s = &slot[slot_num];
 353         struct audio_format_info *a = &afi[s->format];
 354         struct filter_node *fn;
 355         int nf = a->num_filters;
 356         int i;
 357
 358         s->fc = NULL;
 359         if (!nf)
 360                 return;
 361         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
 362         s->fc = para_calloc(sizeof(struct filter_chain));
 363         s->fc->filter_nodes = para_malloc(nf * sizeof(struct filter_node));
 364         s->fc->inbuf = s->receiver_node->buf;
 365         s->fc->in_loaded = &s->receiver_node->loaded;
 366         s->fc->input_error = &s->receiver_node->task.error;
 367         s->fc->task.pre_select = filter_pre_select;
 368         s->fc->task.post_select = NULL;
 369         s->fc->task.error = 0;
 370         s->fc->num_filters = nf;
 371
 372         s->receiver_node->output_error = &s->fc->task.error;
 373         sprintf(s->fc->task.status, "filter chain");
 374         FOR_EACH_FILTER_NODE(fn, s->fc, i) {
 375                 struct filter *f = filters + a->filter_nums[i];
 376                 fn->filter_num = a->filter_nums[i];
 377                 fn->conf = a->filter_conf[i];
 378                 fn->fc = s->fc;
 379                 fn->loaded = 0;
 380                 INIT_LIST_HEAD(&fn->callbacks);
 381                 f->open(fn);
 382                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 383                         audio_formats[s->format], i,  nf, f->name, slot_num);
 384                 s->fc->outbuf = fn->buf;
 385                 s->fc->out_loaded = &fn->loaded;
 386         }
 387         register_task(&s->fc->task);
 388 }
 389
 390 static void open_writers(int slot_num)
 391 {
 392         int ret, i;
 393         struct slot_info *s = &slot[slot_num];
 394         struct audio_format_info *a = &afi[s->format];
 395
 396         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
 397         if (!a->num_writers)
 398                 s->wng = setup_default_wng();
 399         else
 400                 s->wng = wng_new(a->num_writers);
 401         if (s->fc) {
 402                 s->wng->buf = s->fc->outbuf;
 403                 s->wng->loaded = s->fc->out_loaded;
 404                 s->wng->input_error = &s->fc->task.error;
 405                 s->wng->channels = &s->fc->channels;
 406                 s->wng->samplerate = &s->fc->samplerate;
 407                 s->fc->output_error = &s->wng->task.error;
 408                 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
 409         } else {
 410                 s->wng->buf = s->receiver_node->buf;
 411                 s->wng->loaded = &s->receiver_node->loaded;
 412                 s->wng->input_error = &s->receiver_node->task.error;
 413         }
 414         for (i = 0; i < a->num_writers; i++) {
 415                 s->wng->writer_nodes[i].conf = a->writer_conf[i];
 416                 s->wng->writer_nodes[i].writer = a->writers[i];
 417         }
 418         ret = wng_open(s->wng);
 419         if (ret < 0) {
 420                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 421                 return;
 422         }
 423         s->wstime = *now;
 424         activate_inactive_grab_clients(slot_num, s->format, s->fc);
 425 }
 426
 427 static int open_receiver(int format)
 428 {
 429         struct audio_format_info *a = &afi[format];
 430         struct slot_info *s;
 431         int ret, slot_num;
 432         struct receiver_node *rn;
 433         const struct timeval restart_delay = {2, 0};
 434
 435         ret = get_empty_slot();
 436         if (ret < 0)
 437                 goto err;
 438         slot_num = ret;
 439         s = &slot[slot_num];
 440         s->format = format;
 441         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 442         rn = s->receiver_node;
 443         rn->receiver = a->receiver;
 444         rn->conf = a->receiver_conf;
 445         ret = a->receiver->open(s->receiver_node);
 446         if (ret < 0) {
 447                 free(s->receiver_node);
 448                 s->receiver_node = NULL;
 449                 goto err;
 450         }
 451         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 452                 audio_formats[s->format], a->receiver->name, slot_num);
 453         rn->task.pre_select = a->receiver->pre_select;
 454         rn->task.post_select = a->receiver->post_select;
 455         sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
 456         register_task(&rn->task);
 457         ret = 1;
 458 err:
 459         if (ret < 0)
 460                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 461         tv_add(now, &restart_delay, &afi[format].restart_barrier);
 462         return ret;
 463 }
 464
 465 static int receiver_running(int format)
 466 {
 467         int i;
 468
 469         FOR_EACH_SLOT(i) {
 470                 struct slot_info *s = &slot[i];
 471                 if (s->format == format && s->receiver_node)
 472                         return 1;
 473         }
 474         return 0;
 475 }
 476
 477 static void open_current_receiver(struct sched *s)
 478 {
 479         struct timeval diff;
 480         int cafn = stat_task->current_audio_format_num;
 481
 482         if (cafn < 0 || !stat_task->ct)
 483                 return;
 484         if (receiver_running(cafn))
 485                 return;
 486         if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
 487                 s->timeout = diff;
 488                 return;
 489         }
 490         open_receiver(cafn);
 491 }
 492
 493 static unsigned compute_time_diff(const struct timeval *status_time)
 494 {
 495         struct timeval tmp, diff;
 496         static unsigned count;
 497         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
 498         const struct timeval max_deviation = {0, 500 * 1000};
 499         const int time_smooth = 5;
 500
 501         if (!status_time)
 502                 return count;
 503         sign = tv_diff(status_time, now, &diff);
 504 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 505 //                      sign, sa_time_diff_sign);
 506         if (!count) {
 507                 sa_time_diff_sign = sign;
 508                 stat_task->sa_time_diff = diff;
 509                 count++;
 510                 goto out;
 511         }
 512         if (count > 5) {
 513                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
 514                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 515                         PARA_WARNING_LOG("time diff jump: %lims\n",
 516                                 s * tv2ms(&tmp));
 517         }
 518         count++;
 519         sa_time_diff_sign = tv_convex_combination(
 520                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
 521                 count > 10? sign : sign * time_smooth, &diff,
 522                 &tmp);
 523         stat_task->sa_time_diff = tmp;
 524         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
 525                 sign > 0? "+" : "-",
 526                 tv2ms(&diff),
 527                 sa_time_diff_sign ? "+" : "-",
 528                 tv2ms(&stat_task->sa_time_diff)
 529         );
 530 out:
 531         stat_task->sa_time_diff_sign = sa_time_diff_sign;
 532         return count;
 533 }
 534
 535 static int check_stat_line(char *line, __a_unused void *data)
 536 {
 537         int itemnum;
 538         size_t ilen = 0;
 539         long unsigned sec, usec;
 540         char *tmp;
 541
 542         //PARA_INFO_LOG("line: %s\n", line);
 543         if (!line)
 544                 return 1;
 545         itemnum = stat_line_valid(line);
 546         if (itemnum < 0) {
 547                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 548                 return 1;
 549         }
 550         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
 551                 return 1;
 552         tmp = make_message("%s\n", line);
 553         stat_client_write(tmp, itemnum);
 554         free(tmp);
 555         free(stat_item_values[itemnum]);
 556         stat_item_values[itemnum] = para_strdup(line);
 557         ilen = strlen(status_item_list[itemnum]);
 558         switch (itemnum) {
 559         case SI_STATUS:
 560                 stat_task->playing = strstr(line, "playing")? 1 : 0;
 561                 PARA_INFO_LOG("stat task playing: %d\n", stat_task->playing);
 562                 break;
 563         case SI_OFFSET:
 564                 stat_task->offset_seconds = atoi(line + ilen + 1);
 565                 break;
 566         case SI_SECONDS_TOTAL:
 567                 stat_task->length_seconds = atoi(line + ilen + 1);
 568                 break;
 569         case SI_STREAM_START:
 570                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 571                         struct timeval a_start, delay;
 572                         delay.tv_sec = conf.stream_delay_arg / 1000;
 573                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 574                         stat_task->server_stream_start.tv_sec = sec;
 575                         stat_task->server_stream_start.tv_usec = usec;
 576                         if (compute_time_diff(NULL) > 2) {
 577                                 if (stat_task->sa_time_diff_sign < 0)
 578                                         tv_add(&stat_task->server_stream_start,
 579                                                 &stat_task->sa_time_diff, &a_start);
 580                                 else
 581                                         tv_diff(&stat_task->server_stream_start,
 582                                                 &stat_task->sa_time_diff, &a_start);
 583                                 tv_add(&a_start, &delay, &initial_delay_barrier);
 584                         }
 585                 }
 586                 break;
 587         case SI_CURRENT_TIME:
 588                 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
 589                         struct timeval tv = {sec, usec};
 590                         compute_time_diff(&tv);
 591                 }
 592                 break;
 593         case SI_FORMAT:
 594                 stat_task->current_audio_format_num = get_audio_format_num(
 595                         line + ilen + 1);
 596         }
 597         return 1;
 598 }
 599
 600 static int parse_stream_command(const char *txt, char **cmd)
 601 {
 602         char *p = strchr(txt, ':');
 603         int i;
 604
 605         if (!p)
 606                 return -E_MISSING_COLON;
 607         p++;
 608         FOR_EACH_AUDIO_FORMAT(i) {
 609                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
 610                         continue;
 611                 *cmd = p;
 612                 return i;
 613         }
 614         return -E_UNSUPPORTED_AUDIO_FORMAT;
 615 }
 616
 617 static int add_filter(int format, char *cmdline)
 618 {
 619         struct audio_format_info *a = &afi[format];
 620         int filter_num, nf = a->num_filters;
 621
 622         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
 623         if (filter_num < 0)
 624                 return filter_num;
 625         a->filter_nums[nf] = filter_num;
 626         a->num_filters++;
 627         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
 628                 filters[filter_num].name);
 629         return filter_num;
 630 }
 631
 632 static int parse_writer_args(void)
 633 {
 634         int i, ret, nw;
 635         char *cmd;
 636         struct audio_format_info *a;
 637
 638         nw = PARA_MAX(1U, conf.writer_given);
 639         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
 640         FOR_EACH_AUDIO_FORMAT(i) {
 641                 a = &afi[i];
 642                 a->writer_conf = para_malloc(nw * sizeof(void *));
 643                 a->writers = para_malloc(nw * sizeof(struct writer *));
 644                 a->num_writers = 0;
 645         }
 646         for (i = 0; i < conf.writer_given; i++) {
 647                 void *wconf;
 648                 int writer_num;
 649                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
 650                 if (ret < 0)
 651                         goto out;
 652                 a = &afi[ret];
 653                 nw = a->num_writers;
 654                 wconf = check_writer_arg(cmd, &writer_num);
 655                 if (!wconf) {
 656                         ret = writer_num;
 657                         goto out;
 658                 }
 659                 a->writers[nw] = &writers[writer_num];
 660                 a->writer_conf[nw] = wconf;
 661                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
 662                         nw, writer_names[writer_num]);
 663                 a->num_writers++;
 664         }
 665         ret = 1;
 666 out:
 667         return ret;
 668 }
 669
 670 static int parse_receiver_args(void)
 671 {
 672         int i, ret, receiver_num;
 673         char *cmd = NULL;
 674         struct audio_format_info *a;
 675
 676         for (i = conf.receiver_given - 1; i >= 0; i--) {
 677                 char *arg = conf.receiver_arg[i];
 678                 char *recv_arg = strchr(arg, ':');
 679                 ret = -E_MISSING_COLON;
 680                 if (!recv_arg)
 681                         goto out;
 682                 *recv_arg = '\0';
 683                 recv_arg++;
 684                 ret = get_audio_format_num(arg);
 685                 if (ret < 0)
 686                         goto out;
 687                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
 688                 if (!afi[ret].receiver_conf) {
 689                         ret = -E_RECV_SYNTAX;
 690                         goto out;
 691                 }
 692                 afi[ret].receiver = &receivers[receiver_num];
 693         }
 694         /* use the first available receiver with no arguments
 695          * for those audio formats for which no receiver
 696          * was specified
 697          */
 698         cmd = para_strdup(receivers[0].name);
 699         FOR_EACH_AUDIO_FORMAT(i) {
 700                 a = &afi[i];
 701                 if (a->receiver_conf)
 702                         continue;
 703                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
 704                 if (!a->receiver_conf)
 705                         return -E_RECV_SYNTAX;
 706                 a->receiver = &receivers[receiver_num];
 707         }
 708         ret = 1;
 709 out:
 710         free(cmd);
 711         return ret;
 712 }
 713
 714 static int init_default_filters(void)
 715 {
 716         int i, ret = 1;
 717
 718         FOR_EACH_AUDIO_FORMAT(i) {
 719                 struct audio_format_info *a = &afi[i];
 720                 char *tmp;
 721                 int j;
 722
 723                 if (a->num_filters)
 724                         continue; /* no default -- nothing to to */
 725                 /* add "dec" to audio format name */
 726                 tmp = make_message("%sdec", audio_formats[i]);
 727                 for (j = 0; filters[j].name; j++)
 728                         if (!strcmp(tmp, filters[j].name))
 729                                 break;
 730                 free(tmp);
 731                 ret = -E_UNSUPPORTED_FILTER;
 732                 if (!filters[j].name)
 733                         goto out;
 734                 tmp = para_strdup(filters[j].name);
 735                 ret = add_filter(i, tmp);
 736                 free(tmp);
 737                 if (ret < 0)
 738                         goto out;
 739                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
 740                         filters[j].name);
 741         }
 742 out:
 743         return ret;
 744 }
 745
 746 static int parse_filter_args(void)
 747 {
 748         int i, ret, nf;
 749
 750         nf = PARA_MAX(1U, conf.filter_given);
 751         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
 752         FOR_EACH_AUDIO_FORMAT(i) {
 753                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
 754                 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
 755         }
 756         if (!conf.no_default_filters_given)
 757                 return init_default_filters();
 758         for (i = 0; i < conf.filter_given; i++) {
 759                 char *arg = conf.filter_arg[i];
 760                 char *filter_name = strchr(arg, ':');
 761                 ret = -E_MISSING_COLON;
 762                 if (!filter_name)
 763                         goto out;
 764                 *filter_name = '\0';
 765                 filter_name++;
 766                 ret = get_audio_format_num(arg);
 767                 if (ret < 0)
 768                         goto out;
 769                 ret = add_filter(ret, filter_name);
 770                 if (ret < 0)
 771                         goto out;
 772         }
 773         ret = init_default_filters(); /* use default values for the rest */
 774 out:
 775         return ret;
 776 }
 777
 778 static int parse_stream_args(void)
 779 {
 780         int ret;
 781
 782         ret = parse_receiver_args();
 783         if (ret < 0)
 784                 return ret;
 785         ret = parse_filter_args();
 786         if (ret < 0)
 787                 return ret;
 788         ret = parse_writer_args();
 789         if (ret < 0)
 790                 return ret;
 791         return 1;
 792 }
 793
 794 /* does not unlink socket on errors */
 795 static int audiod_get_socket(void)
 796 {
 797         struct sockaddr_un unix_addr;
 798         int ret, fd;
 799
 800         if (conf.socket_given)
 801                 socket_name = para_strdup(conf.socket_arg);
 802         else {
 803                 char *hn = para_hostname();
 804                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
 805                         hn);
 806                 free(hn);
 807         }
 808         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
 809         if (conf.force_given)
 810                 unlink(socket_name);
 811         ret = create_local_socket(socket_name, &unix_addr,
 812                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
 813         if (ret < 0)
 814                 goto err;
 815         fd = ret;
 816         if (listen(fd , 5) < 0) {
 817                 ret = -ERRNO_TO_PARA_ERROR(errno);
 818                 goto err;
 819         }
 820         ret = mark_fd_nonblocking(fd);
 821         if (ret < 0)
 822                 goto err;
 823         return fd;
 824 err:
 825         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
 826         exit(EXIT_FAILURE);
 827 }
 828
 829 static void signal_pre_select(struct sched *s, struct task *t)
 830 {
 831         struct signal_task *st = container_of(t, struct signal_task, task);
 832         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 833 }
 834
 835 static void signal_post_select(struct sched *s, struct task *t)
 836 {
 837         struct signal_task *st = container_of(t, struct signal_task, task);
 838
 839         if (!FD_ISSET(st->fd, &s->rfds))
 840                 return;
 841
 842         st->signum = para_next_signal();
 843         switch (st->signum) {
 844         case SIGINT:
 845         case SIGTERM:
 846         case SIGHUP:
 847                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
 848                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 849         }
 850 }
 851
 852 static void signal_setup_default(struct signal_task *st)
 853 {
 854         st->task.pre_select = signal_pre_select;
 855         st->task.post_select = signal_post_select;
 856         sprintf(st->task.status, "signal task");
 857 }
 858
 859 static void command_pre_select(struct sched *s, struct task *t)
 860 {
 861         struct command_task *ct = container_of(t, struct command_task, task);
 862         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
 863 }
 864
 865 static void command_post_select(struct sched *s, struct task *t)
 866 {
 867         int ret;
 868         struct command_task *ct = container_of(t, struct command_task, task);
 869
 870         audiod_status_dump();
 871         if (!FD_ISSET(ct->fd, &s->rfds))
 872                 return;
 873         ret = handle_connect(ct->fd);
 874         if (ret < 0)
 875                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 876 }
 877
 878 static void init_command_task(struct command_task *ct)
 879 {
 880         ct->task.pre_select = command_pre_select;
 881         ct->task.post_select = command_post_select;
 882         ct->task.error = 0;
 883         ct->fd = audiod_get_socket(); /* doesn't return on errors */
 884         sprintf(ct->task.status, "command task");
 885 }
 886
 887 static void close_stat_pipe(void)
 888 {
 889         int i;
 890
 891         if (!stat_task->ct)
 892                 return;
 893         client_close(stat_task->ct);
 894         stat_task->ct = NULL;
 895         FOR_EACH_STATUS_ITEM(i) {
 896                 free(stat_item_values[i]);
 897                 stat_item_values[i] = NULL;
 898         }
 899         dump_empty_status();
 900         stat_task->length_seconds = 0;
 901         stat_task->offset_seconds = 0;
 902         audiod_status_dump();
 903         stat_task->playing = 0;
 904 }
 905
 906 /**
 907  * close the connection to para_server and exit
 908  *
 909  * \param status the exit status which is passed to exit(3)
 910  * \param msg the log message
 911  *
 912  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
 913  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
 914  * EXIT_FAILURE.
 915  *
 916  * \sa exit(3)
 917  */
 918 void __noreturn clean_exit(int status, const char *msg)
 919 {
 920         PARA_EMERG_LOG("%s\n", msg);
 921         if (socket_name)
 922                 unlink(socket_name);
 923         close_stat_pipe();
 924         exit(status);
 925 }
 926
 927 /* avoid busy loop if server is down */
 928 static void set_stat_task_restart_barrier(unsigned seconds)
 929 {
 930         struct timeval delay = {seconds, 0};
 931         tv_add(now, &delay, &stat_task->restart_barrier);
 932 }
 933
 934 static void try_to_close_slot(int slot_num)
 935 {
 936         struct slot_info *s = &slot[slot_num];
 937
 938         if (s->format < 0)
 939                 return;
 940         if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
 941                 return;
 942         if (s->fc && s->fc->task.error != -E_TASK_UNREGISTERED)
 943                 return;
 944         if (s->wng && s->wng->task.error != -E_TASK_UNREGISTERED)
 945                 return;
 946         PARA_INFO_LOG("closing slot %d\n", slot_num);
 947         wng_close(s->wng);
 948         close_filters(s->fc);
 949         free(s->fc);
 950         close_receiver(slot_num);
 951         clear_slot(slot_num);
 952 }
 953
 954 /*
 955  * Check if any receivers/filters/writers need to be started and do so if
 956  * necessary.
 957  */
 958 static void start_stop_decoders(struct sched *s)
 959 {
 960         int i;
 961
 962         FOR_EACH_SLOT(i)
 963                 try_to_close_slot(i);
 964         if (audiod_status != AUDIOD_ON || !stat_task->playing)
 965                 return kill_all_decoders(-E_NOT_PLAYING);
 966         open_current_receiver(s);
 967         FOR_EACH_SLOT(i) {
 968                 struct slot_info *sl = &slot[i];
 969                 struct audio_format_info *a;
 970                 struct timeval diff;
 971
 972                 if (sl->format < 0)
 973                         continue;
 974                 a = &afi[sl->format];
 975                 if (!sl->receiver_node)
 976                         continue;
 977                 if ((!a->num_filters || sl->fc) && sl->wng)
 978                         continue; /* everything already started */
 979                 if (!a->num_filters) {
 980                         if (sl->receiver_node->loaded && !sl->wng) {
 981                                 open_writers(i);
 982                         }
 983                         continue;
 984                 }
 985                 if (sl->receiver_node->loaded && !sl->fc) {
 986                         open_filters(i);
 987                         continue;
 988                 }
 989                 if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
 990                         continue;
 991                 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
 992                         open_writers(i);
 993                         continue;
 994                 }
 995                 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
 996                 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
 997                         s->timeout = diff;
 998                 }
 999         }
1000 }
1001
1002
1003 /* restart the client task if necessary */
1004 static void status_pre_select(struct sched *s, struct task *t)
1005 {
1006         struct status_task *st = container_of(t, struct status_task, task);
1007
1008         if (audiod_status == AUDIOD_OFF) {
1009                 if (!st->ct)
1010                         goto out;
1011                 if (st->ct->task.error >= 0) {
1012                         st->ct->task.error = -E_AUDIOD_OFF;
1013                         goto out;
1014                 }
1015                 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1016                         goto out;
1017                 close_stat_pipe();
1018                 st->clock_diff_count = conf.clock_diff_count_arg;
1019                 goto out;
1020         }
1021         if (st->ct) {
1022                 unsigned bytes_left;
1023                 if (st->ct->task.error < 0) {
1024                         if (st->ct->task.error != -E_TASK_UNREGISTERED)
1025                                 goto out;
1026                         close_stat_pipe();
1027                         goto out;
1028                 }
1029                 if (st->ct->status != CL_RECEIVING)
1030                         goto out;
1031                 bytes_left = for_each_line(st->ct->buf, st->ct->loaded,
1032                         &check_stat_line, NULL);
1033                 if (st->ct->loaded != bytes_left) {
1034                         st->last_status_read = *now;
1035                         st->ct->loaded = bytes_left;
1036                 } else {
1037                         struct timeval diff;
1038                         tv_diff(now, &st->last_status_read, &diff);
1039                         if (diff.tv_sec > 61)
1040                                 st->ct->task.error = -E_STATUS_TIMEOUT;
1041                 }
1042                 goto out;
1043         }
1044         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1045                 goto out;
1046         if (st->clock_diff_count) { /* get status only one time */
1047                 char *argv[] = {"audiod", "stat", "1", NULL};
1048                 int argc = 3;
1049                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1050                 st->clock_diff_count--;
1051                 client_open(argc, argv, &st->ct, NULL);
1052                 set_stat_task_restart_barrier(2);
1053
1054         } else {
1055                 char *argv[] = {"audiod", "stat", NULL};
1056                 int argc = 2;
1057                 client_open(argc, argv, &st->ct, NULL);
1058                 set_stat_task_restart_barrier(5);
1059         }
1060         free(stat_item_values[SI_BASENAME]);
1061         stat_item_values[SI_BASENAME] = make_message(
1062                 "%s: no connection to para_server\n",
1063                 status_item_list[SI_BASENAME]);
1064         stat_client_write(stat_item_values[SI_BASENAME],
1065                 SI_BASENAME);
1066         st->last_status_read = *now;
1067 out:
1068         start_stop_decoders(s);
1069 }
1070
1071 static void init_status_task(struct status_task *st)
1072 {
1073         memset(st, 0, sizeof(struct status_task));
1074         st->task.pre_select = status_pre_select;
1075         st->sa_time_diff_sign = 1;
1076         st->clock_diff_count = conf.clock_diff_count_arg;
1077         st->current_audio_format_num = -1;
1078         sprintf(st->task.status, "status task");
1079 }
1080
1081 static void set_initial_status(void)
1082 {
1083         audiod_status = AUDIOD_ON;
1084         if (!conf.mode_given)
1085                 return;
1086         if (!strcmp(conf.mode_arg, "sb")) {
1087                 audiod_status = AUDIOD_STANDBY;
1088                 return;
1089         }
1090         if (!strcmp(conf.mode_arg, "off")) {
1091                 audiod_status = AUDIOD_OFF;
1092                 return;
1093         }
1094         if (strcmp(conf.mode_arg, "on"))
1095                 PARA_WARNING_LOG("invalid mode\n");
1096 }
1097
1098 __noreturn static void print_help_and_die(void)
1099 {
1100         int d = conf.detailed_help_given;
1101         const char **p = d? audiod_args_info_detailed_help
1102                 : audiod_args_info_help;
1103
1104         printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1105                 AUDIOD_CMDLINE_PARSER_VERSION);
1106         printf_or_die("%s\n\n", audiod_args_info_usage);
1107         for (; *p; p++)
1108                 printf_or_die("%s\n", *p);
1109         print_receiver_helps(d);
1110         print_filter_helps(d);
1111         print_writer_helps(d);
1112         exit(0);
1113 }
1114
1115 static void init_colors_or_die(void)
1116 {
1117         int ret, i;
1118
1119         if (!want_colors())
1120                 return;
1121         daemon_set_default_log_colors();
1122         daemon_set_flag(DF_COLOR_LOG);
1123         for (i = 0; i < conf.log_color_given; i++) {
1124                 ret = daemon_set_log_color(conf.log_color_arg[i]);
1125                 if (ret < 0)
1126                         exit(EXIT_FAILURE);
1127         }
1128 }
1129
1130 /**
1131  * the main function of para_audiod
1132  *
1133  * \param argc usual argument count
1134  * \param argv usual argument vector
1135  *
1136  * \return EXIT_SUCCESS or EXIT_FAILURE
1137  *
1138  * \sa para_audiod(1)
1139  * */
1140 int main(int argc, char *argv[])
1141 {
1142         int ret, i;
1143         static struct sched s;
1144         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1145         struct audiod_cmdline_parser_params params = {
1146                 .override = 0,
1147                 .initialize = 1,
1148                 .check_required = 0,
1149                 .check_ambiguity = 0,
1150                 .print_errors = 1
1151         };
1152
1153         valid_fd_012();
1154         if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1155                 exit(EXIT_FAILURE);
1156         HANDLE_VERSION_FLAG("audiod", conf);
1157         /* init receivers/filters/writers early to make help work */
1158         recv_init();
1159         filter_init();
1160         writer_init();
1161         if (conf.help_given || conf.detailed_help_given)
1162                 print_help_and_die();
1163         drop_privileges_or_die(conf.user_arg, conf.group_arg);
1164         parse_config_or_die();
1165         init_colors_or_die();
1166         daemon_set_flag(DF_LOG_TIME);
1167         daemon_set_flag(DF_LOG_HOSTNAME);
1168         daemon_set_flag(DF_LOG_LL);
1169         if (conf.logfile_given) {
1170                 daemon_set_logfile(conf.logfile_arg);
1171                 daemon_open_log_or_die();
1172         }
1173         ret = parse_stream_args();
1174         if (ret < 0) {
1175                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1176                 exit(EXIT_FAILURE);
1177         }
1178         log_welcome("para_audiod");
1179         server_uptime(UPTIME_SET);
1180         set_initial_status();
1181         FOR_EACH_SLOT(i)
1182                 clear_slot(i);
1183         init_grabbing();
1184         setup_signal_handling();
1185         signal_setup_default(sig_task);
1186
1187         init_status_task(stat_task);
1188         init_command_task(cmd_task);
1189
1190         if (conf.daemon_given)
1191                 daemonize();
1192
1193         register_task(&sig_task->task);
1194         register_task(&cmd_task->task);
1195         register_task(&stat_task->task);
1196         s.default_timeout.tv_sec = 0;
1197         s.default_timeout.tv_usec = 99 * 1000;
1198         ret = schedule(&s);
1199
1200         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1201         return EXIT_FAILURE;
1202 }