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 <sys/time.h> /* gettimeofday */
  22 #include "para.h"
  23
  24 #include "audiod.cmdline.h"
  25 #include "list.h"
  26 #include "close_on_fork.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
  39 /** define the array of error lists needed by para_audiod */
  40 INIT_AUDIOD_ERRLISTS;
  41 /** define the array containing all supported audio formats */
  42 DEFINE_AUDIO_FORMAT_ARRAY;
  43
  44 /**
  45  * the possible modes of operation
  46  *
  47  * - off: disconnect from para_server
  48  * - on: receive status information from para_server and play the audio stream
  49  * - sb: only receive status information but not the audio stream
  50 */
  51 enum {AUDIOD_OFF, AUDIOD_ON, AUDIOD_STANDBY};
  52
  53 /** defines how to handle one supported audio format */
  54 struct audio_format_info {
  55 /** pointer to the receiver for this audio format */
  56         struct receiver *receiver;
  57 /** the receiver configuration */
  58         void *receiver_conf;
  59 /** the number of filters that should be activated for this audio format */
  60         unsigned int num_filters;
  61 /** pointer to the array of filters to be activated */
  62         struct filter **filters;
  63 /** pointer to the array of filter configurations */
  64         void **filter_conf;
  65 /** output of the last filter is written to stdin of this command */
  66         char *write_cmd;
  67 /** do not start receiver/filters/writer before this time */
  68         struct timeval restart_barrier;
  69 };
  70
  71 /**
  72  * describes one instance of a receiver-filter-writer chain
  73  *
  74  * \sa receier_node, receiver, filter, filter_node, filter_chain_info
  75   */
  76 struct slot_info {
  77 /** number of the audio format in this slot */
  78         int format;
  79 /** the file descriptor of the writer */
  80         int write_fd;
  81 /** the process id of the writer */
  82         pid_t wpid;
  83 /** time of the last successful read from the receiver */
  84         struct timeval rtime;
  85 /** time the last write to the write fd happend */
  86         struct timeval wtime;
  87 /** writer start time */
  88         struct timeval wstime;
  89 /** did we include \a write_fd in the fdset */
  90         int  wcheck;
  91 /** set to one if we have sent the TERM signal to \a wpid */
  92         int wkilled;
  93 /** the receiver info associated with this slot */
  94         struct receiver_node *receiver_node;
  95 /** the active filter chain */
  96         struct filter_chain_info *fci;
  97 };
  98
  99 static struct slot_info slot[MAX_STREAM_SLOTS];
 100
 101 /** defines one command of para_audiod */
 102 struct audiod_command {
 103 /** the name of the command */
 104 const char *name;
 105 /** pointer to the function that handles the command */
 106 int (*handler)(int, int, char**);
 107 /** one-line description of the command */
 108 const char *description;
 109 /** summary of the command line options */
 110 const char *synopsis;
 111 /** the long help text */
 112 const char *help;
 113 };
 114
 115 extern const char *status_item_list[NUM_STAT_ITEMS];
 116
 117 static int com_grab(int, int, char **);
 118 static int com_cycle(int, int, char **);
 119 static int com_help(int, int, char **);
 120 static int com_off(int, int, char **);
 121 static int com_on(int, int, char **);
 122 static int com_sb(int, int, char **);
 123 static int com_stat(int, int, char **);
 124 static int com_term(int, int, char **);
 125 static int stat_pipe = -1, signal_pipe;
 126
 127 static struct gengetopt_args_info conf;
 128 static struct timeval server_stream_start, sa_time_diff;
 129 static int playing, current_decoder = -1,
 130         audiod_status = AUDIOD_ON, offset_seconds, length_seconds,
 131         sa_time_diff_sign = 1, audiod_socket = -1;
 132 static char *af_status, /* the audio format announced in server status */
 133         *socket_name, *hostname;
 134 static char *stat_item_values[NUM_STAT_ITEMS];
 135 static FILE *logfile;
 136 static const struct timeval restart_delay = {0, 300 * 1000};
 137
 138 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
 139
 140 static struct audiod_command cmds[] = {
 141 {
 142 .name = "cycle",
 143 .handler = com_cycle,
 144 .description = "switch to next mode",
 145 .synopsis = "cycle",
 146 .help =
 147
 148 "on -> standby -> off -> on\n"
 149
 150 },
 151 {
 152 .name = "grab",
 153 .handler = com_grab,
 154 .description = "grab the audio stream",
 155 .synopsis = "-- grab [grab_options]",
 156 .help =
 157
 158 "grab ('splice') the audio stream at any position in the filter      \n"
 159 "chain and send that data back to the client. Try\n"
 160 "\t para_audioc -- grab -h\n"
 161 "for the list of available options.\n"
 162 },
 163
 164 {
 165 .name = "help",
 166 .handler = com_help,
 167 .description = "display command list or help for given command",
 168 .synopsis = "help [command]",
 169 .help =
 170
 171 "When I was younger, so much younger than today, I never needed\n"
 172 "anybody's help in any way. But now these days are gone, I'm not so\n"
 173 "self assured. Now I find I've changed my mind and opened up the doors.\n"
 174 "\n"
 175 "                               -- Beatles: Help\n"
 176
 177 },
 178 {
 179 .name = "off",
 180 .handler = com_off,
 181 .description = "deactivate para_audiod",
 182 .synopsis = "off",
 183 .help =
 184
 185 "Close connection to para_server and stop all decoders.\n"
 186
 187 },
 188 {
 189 .name = "on",
 190 .handler = com_on,
 191 .description = "activate para_audiod",
 192 .synopsis = "on",
 193 .help =
 194
 195 "Establish connection to para_server, retrieve para_server's current\n"
 196 "status. If playing, start corresponding decoder. Otherwise stop\n"
 197 "all decoders.\n"
 198
 199 },
 200 {
 201 .name = "sb",
 202 .handler = com_sb,
 203 .description = "enter standby mode",
 204 .synopsis = "sb",
 205 .help =
 206
 207 "Stop all decoders but leave connection to para_server open.\n"
 208
 209 },
 210 {
 211 .name = "stat",
 212 .handler = com_stat,
 213 .description = "print status information",
 214 .synopsis = "stat [item1 ...]",
 215 .help =
 216
 217 "Dump given status items (all if none given) to stdout.\n"
 218
 219 },
 220 {
 221 .name = "term",
 222 .handler = com_term,
 223 .description = "terminate audiod",
 224 .synopsis = "term",
 225 .help =
 226
 227 "Stop all decoders, shut down connection to para_server and exit.\n"
 228
 229 },
 230 {
 231 .name = NULL,
 232 }
 233 };
 234
 235 /** iterate over all slots */
 236 #define FOR_EACH_SLOT(slot) for (slot = 0; slot < MAX_STREAM_SLOTS; slot++)
 237 /** iterate over all supported audio formats */
 238 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
 239 /** iterate over the array of all audiod commands */
 240 #define FOR_EACH_COMMAND(c) for (c = 0; cmds[c].name; c++)
 241
 242 /**
 243  * get the audio format number
 244  * \param name the name of the audio format
 245  *
 246  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
 247  * \a name is not a supported audio format.
 248  */
 249 int get_audio_format_num(char *name)
 250 {
 251         int i;
 252         FOR_EACH_AUDIO_FORMAT(i)
 253                 if (!strcmp(name, audio_formats[i]))
 254                         return i;
 255         return -E_UNSUPPORTED_AUDIO_FORMAT;
 256 }
 257
 258 /*
 259  * log function. first argument is loglevel.
 260  */
 261 void para_log(int ll, const char* fmt,...)
 262 {
 263         va_list argp;
 264         FILE *outfd;
 265         struct tm *tm;
 266         time_t t1;
 267         char str[MAXLINE] = "";
 268
 269         if (ll < conf.loglevel_arg)
 270                 return;
 271         if (!logfile && conf.logfile_given)
 272                 logfile = open_log(conf.logfile_arg);
 273         if (!logfile && conf.daemon_given)
 274                 return;
 275         if (!logfile) {
 276                 if (ll < WARNING)
 277                         outfd = stdout;
 278                 else
 279                         outfd = stderr;
 280         } else
 281                 outfd = logfile;
 282         time(&t1);
 283         tm = localtime(&t1);
 284         strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
 285         fprintf(outfd, "%s %s ", str, hostname);
 286         if (conf.loglevel_arg <= INFO)
 287                 fprintf(outfd, "%i ", ll);
 288         va_start(argp, fmt);
 289         vfprintf(outfd, fmt, argp);
 290         va_end(argp);
 291 }
 292
 293 static int client_write(int fd, const char *buf)
 294 {
 295         size_t len = strlen(buf);
 296         return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
 297 }
 298
 299 static char *get_time_string(struct timeval *newest_stime)
 300 {
 301         struct timeval now, diff, adj_stream_start, tmp;
 302         int total = 0, use_server_time = 1;
 303
 304         if (!playing) {
 305                 if (length_seconds)
 306                         return NULL;
 307                 return make_message("%s:\n", status_item_list[SI_PLAY_TIME]);
 308         }
 309         if (audiod_status == AUDIOD_OFF)
 310                 goto out;
 311         if (sa_time_diff_sign > 0)
 312                 tv_diff(&server_stream_start, &sa_time_diff,
 313                         &adj_stream_start);
 314         else
 315                 tv_add(&server_stream_start, &sa_time_diff,
 316                         &adj_stream_start);
 317         tmp = adj_stream_start;
 318         if (newest_stime && audiod_status == AUDIOD_ON) {
 319                 tv_diff(newest_stime, &adj_stream_start, &diff);
 320                 if (tv2ms(&diff) < 5000) {
 321                         tmp = *newest_stime;
 322                         use_server_time = 0;
 323                 }
 324         }
 325         gettimeofday(&now, NULL);
 326         tv_diff(&now, &tmp, &diff);
 327         total = diff.tv_sec + offset_seconds;
 328         if (total > length_seconds)
 329                 total = length_seconds;
 330         if (total < 0)
 331                 total = 0;
 332 out:
 333         return make_message(
 334                 "%s:%s%d:%02d [%d:%02d] (%d%%/%d:%02d)\n",
 335                 status_item_list[SI_PLAY_TIME],
 336                 use_server_time? "~" : "",
 337                 total / 60,
 338                 total % 60,
 339                 (length_seconds - total) / 60,
 340                 (length_seconds - total) % 60,
 341                 length_seconds? (total * 100 + length_seconds / 2) /
 342                         length_seconds : 0,
 343                 length_seconds / 60,
 344                 length_seconds % 60
 345         );
 346 }
 347
 348 __malloc static char *audiod_status_string(void)
 349 {
 350         const char *status = (audiod_status == AUDIOD_ON)?
 351                 "on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
 352         return make_message("%s:%s\n", status_item_list[SI_AUDIOD_STATUS], status);
 353 }
 354
 355 static struct timeval *wstime(void)
 356 {
 357         int i;
 358         struct timeval *max = NULL;
 359         FOR_EACH_SLOT(i) {
 360                 struct slot_info *s = &slot[i];
 361                 if (s->wpid <= 0)
 362                         continue;
 363                 if (max && tv_diff(&s->wstime, max, NULL) <= 0)
 364                         continue;
 365                 max = &s->wstime;
 366         }
 367         return max;
 368 }
 369 __malloc static char *decoder_flags(void)
 370 {
 371         int i;
 372         char decoder_flags[MAX_STREAM_SLOTS + 1];
 373
 374         FOR_EACH_SLOT(i) {
 375                 struct slot_info *s = &slot[i];
 376                 char flag = '0';
 377                 if (s->receiver_node)
 378                         flag += 1;
 379                 if (s->wpid > 0)
 380                         flag += 2;
 381                 if (flag != '0')
 382                         flag += s->format * 4;
 383                 decoder_flags[i] = flag;
 384         }
 385         decoder_flags[MAX_STREAM_SLOTS] = '\0';
 386         return make_message("%s:%s\n", status_item_list[SI_DECODER_FLAGS],
 387                 decoder_flags);
 388 }
 389
 390 static char *configfile_exists(void)
 391 {
 392         static char *config_file;
 393
 394         if (!config_file) {
 395                 char *home = para_homedir();
 396                 config_file = make_message("%s/.paraslash/audiod.conf", home);
 397                 free(home);
 398         }
 399         return file_exists(config_file)? config_file : NULL;
 400 }
 401
 402 static void setup_signal_handling(void)
 403 {
 404         signal_pipe = para_signal_init();
 405         PARA_INFO_LOG("signal pipe: fd %d\n", signal_pipe);
 406         para_install_sighandler(SIGINT);
 407         para_install_sighandler(SIGTERM);
 408         para_install_sighandler(SIGCHLD);
 409         para_install_sighandler(SIGHUP);
 410         signal(SIGPIPE, SIG_IGN);
 411 }
 412
 413 static void audiod_status_dump(void)
 414 {
 415         static char *p_ts, *p_us, *p_as, *p_df;
 416         struct timeval *t = wstime();
 417         char *us, *tmp = get_time_string(t);
 418
 419         if (tmp && (!p_ts || strcmp(tmp, p_ts)))
 420                 stat_client_write(tmp, SI_PLAY_TIME);
 421         free(p_ts);
 422         p_ts = tmp;
 423
 424         us = uptime_str();
 425         tmp = make_message("%s:%s\n", status_item_list[SI_AUDIOD_UPTIME], us);
 426         free(us);
 427         if (!p_us || strcmp(p_us, tmp))
 428                 stat_client_write(tmp, SI_AUDIOD_UPTIME);
 429         free(p_us);
 430         p_us = tmp;
 431
 432         tmp = audiod_status_string();
 433         if (!p_as || strcmp(p_as, tmp))
 434                 stat_client_write(tmp, SI_AUDIOD_STATUS);
 435         free(p_as);
 436         p_as = tmp;
 437
 438         tmp = decoder_flags();
 439         if (!p_df || strcmp(p_df, tmp))
 440                 stat_client_write(tmp, SI_DECODER_FLAGS);
 441         free(p_df);
 442         p_df = tmp;
 443 }
 444
 445 static void clear_slot(int slot_num)
 446 {
 447         struct slot_info *s = &slot[slot_num];
 448
 449         PARA_INFO_LOG("clearing slot %d\n", slot_num);
 450         memset(s, 0, sizeof(struct slot_info));
 451         s->format = -1;
 452 }
 453
 454 static void kill_stream_writer(int slot_num)
 455 {
 456         struct slot_info *s = &slot[slot_num];
 457
 458         if (s->format < 0 || s->wkilled || s->wpid <= 0)
 459                 return;
 460         PARA_DEBUG_LOG("kill -TERM %d (%s stream writer in slot %d)\n",
 461                 s->wpid, audio_formats[s->format], slot_num);
 462         kill(s->wpid, SIGTERM);
 463         s->wkilled = 1;
 464         s->fci->error = 1;
 465 }
 466
 467 static void set_restart_barrier(int format, struct timeval *now)
 468 {
 469         struct timeval tmp;
 470
 471         if (now)
 472                 tmp = *now;
 473         else
 474                 gettimeofday(&tmp, NULL);
 475         tv_add(&tmp, &restart_delay, &afi[format].restart_barrier);
 476 }
 477
 478 static void close_receiver(int slot_num)
 479 {
 480         struct slot_info *s = &slot[slot_num];
 481         struct audio_format_info *a;
 482
 483         if (s->format < 0 || !s->receiver_node)
 484                 return;
 485         a = &afi[s->format];
 486         PARA_NOTICE_LOG("closing %s recevier in slot %d\n",
 487                 audio_formats[s->format] , slot_num);
 488         a->receiver->close(s->receiver_node);
 489         free(s->receiver_node);
 490         s->receiver_node = NULL;
 491         set_restart_barrier(s->format, NULL);
 492 }
 493
 494 static void kill_all_decoders(void)
 495 {
 496         int i;
 497
 498         FOR_EACH_SLOT(i)
 499                 if (slot[i].format >= 0) {
 500                         PARA_INFO_LOG("stopping decoder in slot %d\n", i);
 501                         kill_stream_writer(i);
 502                 }
 503 }
 504
 505 static void check_sigchld(void)
 506 {
 507         pid_t pid;
 508         int i;
 509         struct timeval now;
 510         gettimeofday(&now, NULL);
 511
 512 reap_next_child:
 513         pid = para_reap_child();
 514         if (pid <= 0)
 515                 return;
 516         FOR_EACH_SLOT(i) {
 517                 struct slot_info *s = &slot[i];
 518                 long lifetime;
 519                 if (s->format < 0)
 520                         continue;
 521                 if (pid == s->wpid) {
 522                         s->wpid = -1;
 523                         lifetime = now.tv_sec - s->wstime.tv_sec;
 524                         PARA_INFO_LOG("%s stream writer in slot %d died "
 525                                 "after %li secs\n",
 526                                 audio_formats[s->format], i, lifetime);
 527                         set_restart_barrier(s->format, &now);
 528                         goto reap_next_child;
 529                 }
 530         }
 531         PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
 532         goto reap_next_child;
 533 }
 534
 535 static int get_empty_slot(void)
 536 {
 537         int i;
 538         struct slot_info *s;
 539
 540         FOR_EACH_SLOT(i) {
 541                 s = &slot[i];
 542                 if (s->format < 0) {
 543                         clear_slot(i);
 544                         return i;
 545                 }
 546                 if (s->write_fd > 0 || s->wpid > 0)
 547                         continue;
 548                 if (s->receiver_node)
 549                         continue;
 550                 if (s->fci)
 551                         continue;
 552                 clear_slot(i);
 553                 return i;
 554         }
 555         return -E_NO_MORE_SLOTS;
 556 }
 557
 558 static int decoder_running(int format)
 559 {
 560         int i, ret = 0;
 561         struct slot_info *s;
 562
 563         FOR_EACH_SLOT(i) {
 564                 s = &slot[i];
 565                 if (s->format == format && s->receiver_node)
 566                         ret |= 1;
 567                 if (s->format == format && s->wpid > 0)
 568                         ret |= 2;
 569         }
 570         return ret;
 571 }
 572
 573 static void close_stat_pipe(void)
 574 {
 575         int i;
 576
 577         if (stat_pipe < 0)
 578                 return;
 579         PARA_NOTICE_LOG("%s", "closing status pipe\n");
 580         close(stat_pipe);
 581         del_close_on_fork_list(stat_pipe);
 582         stat_pipe = -1;
 583         kill_all_decoders();
 584         for (i = 0; i < NUM_STAT_ITEMS; i++) {
 585                 free(stat_item_values[i]);
 586                 stat_item_values[i] = NULL;
 587         }
 588         dump_empty_status();
 589         length_seconds = 0;
 590         offset_seconds = 0;
 591         audiod_status_dump();
 592         playing = 0;
 593         stat_item_values[SI_STATUS_BAR] = make_message("%s:no connection to para_server\n",
 594                 status_item_list[SI_STATUS_BAR]);
 595         stat_client_write(stat_item_values[SI_STATUS_BAR], SI_STATUS_BAR);
 596 }
 597
 598 static void __noreturn clean_exit(int status, const char *msg)
 599 {
 600         PARA_EMERG_LOG("%s\n", msg);
 601         kill_all_decoders();
 602         if (socket_name)
 603                 unlink(socket_name);
 604         if (stat_pipe >= 0)
 605                 close_stat_pipe();
 606         exit(status);
 607 }
 608
 609 __malloc static char *glob_cmd(char *cmd)
 610 {
 611         char *ret, *replacement;
 612         struct timeval tmp, delay, rss; /* real stream start */
 613
 614         delay.tv_sec = conf.stream_delay_arg / 1000;
 615         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
 616 //      PARA_INFO_LOG("delay: %lu:%lu\n", delay.tv_sec, delay.tv_usec);
 617         if (sa_time_diff_sign < 0)
 618                 tv_add(&server_stream_start, &sa_time_diff, &rss);
 619         else
 620                 tv_diff(&server_stream_start, &sa_time_diff, &rss);
 621         tv_add(&rss, &delay, &tmp);
 622         replacement = make_message("%lu:%lu", tmp.tv_sec, tmp.tv_usec);
 623         ret = s_a_r(cmd, "STREAM_START", replacement);
 624         free(replacement);
 625         if (!ret)
 626                 goto out;
 627         PARA_INFO_LOG("cmd: %s, repl: %s\n", cmd, ret);
 628         {
 629         struct timeval now;
 630         gettimeofday(&now, NULL);
 631         PARA_INFO_LOG("now: %lu:%lu\n", now.tv_sec, now.tv_usec);
 632         }
 633 out:
 634         return ret;
 635 }
 636
 637 /** get the number of filters for the given audio format */
 638 int num_filters(int audio_format_num)
 639 {
 640         return afi[audio_format_num].num_filters;
 641 }
 642
 643 static void open_filters(int slot_num)
 644 {
 645         struct slot_info *s = &slot[slot_num];
 646         struct audio_format_info *a = &afi[s->format];
 647         int nf = a->num_filters;
 648         int i;
 649
 650         s->fci = para_calloc(sizeof(struct filter_chain_info));
 651         INIT_LIST_HEAD(&s->fci->filters);
 652         if (!nf)
 653                 return;
 654         s->fci->inbuf = s->receiver_node->buf;
 655         s->fci->in_loaded = &s->receiver_node->loaded;
 656         s->fci->outbuf = s->receiver_node->buf;
 657         s->fci->out_loaded = &s->receiver_node->loaded;
 658         s->fci->eof = &s->receiver_node->eof;
 659         for (i = 0; i < nf; i++) {
 660                 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
 661                 fn->conf = a->filter_conf[i];
 662                 fn->fci = s->fci;
 663                 fn->filter = a->filters[i];
 664                 INIT_LIST_HEAD(&fn->callbacks);
 665                 list_add_tail(&fn->node, &s->fci->filters);
 666                 fn->filter->open(fn);
 667                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
 668                         audio_formats[s->format], i + 1,  nf,
 669                         fn->filter->name, slot_num);
 670                 s->fci->outbuf = fn->buf;
 671                 s->fci->out_loaded = &fn->loaded;
 672         }
 673         PARA_DEBUG_LOG("output buffer for filter chain %p: %p\n", s->fci,
 674                 s->fci->outbuf);
 675 }
 676
 677 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
 678 {
 679         struct filter_node *fn;
 680         int i, j;
 681
 682         FOR_EACH_SLOT(i) {
 683                 struct slot_info *s = &slot[i];
 684                 if (s->format < 0 || !s->fci)
 685                         continue;
 686                 if (slot_num >= 0 && slot_num != i)
 687                         continue;
 688                 if (format >= 0 && s->format != format)
 689                         continue;
 690                 if (num_filters(i) < filternum)
 691                         continue;
 692                 /* success */
 693                 j = 1;
 694                 list_for_each_entry(fn, &s->fci->filters, node)
 695                         if (filternum <= 0 || j++ == filternum)
 696                                 break;
 697                 return fn;
 698         }
 699         return NULL;
 700 }
 701
 702 static void start_stream_writer(int slot_num)
 703 {
 704         int ret, fds[3] = {1, -1, -1};
 705         struct slot_info *s = &slot[slot_num];
 706         struct audio_format_info *a = &afi[s->format];
 707         char *glob = NULL;
 708
 709         if (a->write_cmd)
 710                 glob = glob_cmd(a->write_cmd);
 711         if (!glob)
 712                 glob = para_strdup("para_play");
 713         PARA_INFO_LOG("starting stream writer: %s\n", glob);
 714         open_filters(slot_num);
 715         ret = para_exec_cmdline_pid(&s->wpid, glob, fds);
 716         free(glob);
 717         if (ret < 0) {
 718                 PARA_ERROR_LOG("exec failed (%d)\n", ret);
 719                 return;
 720         }
 721         s->write_fd = fds[0];
 722         add_close_on_fork_list(s->write_fd);
 723         /* we write to this fd in do_select, so we need non-blocking */
 724         mark_fd_nonblock(s->write_fd);
 725         gettimeofday(&s->wstime, NULL);
 726         current_decoder = slot_num;
 727         activate_inactive_grab_clients(slot_num, s->format, &s->fci->filters);
 728 }
 729
 730 static void open_receiver(int format)
 731 {
 732         struct audio_format_info *a = &afi[format];
 733         struct slot_info *s;
 734         int ret, slot_num;
 735
 736         slot_num = get_empty_slot();
 737         if (slot_num < 0)
 738                 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
 739         s = &slot[slot_num];
 740         s->format = format;
 741         gettimeofday(&s->rtime, NULL);
 742         s->wtime = s->rtime;
 743         s->receiver_node = para_calloc(sizeof(struct receiver_node));
 744         s->receiver_node->conf = a->receiver_conf;
 745         ret = a->receiver->open(s->receiver_node);
 746         if (ret < 0) {
 747                 PARA_ERROR_LOG("failed to open receiver (%s)\n",
 748                         PARA_STRERROR(-ret));
 749                 free(s->receiver_node);
 750                 s->receiver_node = NULL;
 751                 return;
 752         }
 753         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
 754                 audio_formats[s->format], a->receiver->name, slot_num);
 755 }
 756
 757 static int is_frozen(int format)
 758 {
 759         struct timeval now;
 760         struct audio_format_info *a = &afi[format];
 761
 762         gettimeofday(&now, NULL);
 763         return (tv_diff(&now, &a->restart_barrier, NULL) > 0)? 0 : 1;
 764 }
 765
 766 static void start_current_receiver(void)
 767 {
 768         int i;
 769
 770         if (!af_status)
 771                 return;
 772         i = get_audio_format_num(af_status);
 773         if (i < 0)
 774                 return;
 775         if ((decoder_running(i) & 1) || is_frozen(i))
 776                 return;
 777         open_receiver(i);
 778 }
 779
 780 static void compute_time_diff(const struct timeval *status_time)
 781 {
 782         struct timeval now, tmp, diff;
 783         static int count;
 784         int sign;
 785         const struct timeval max_deviation = {0, 500 * 1000};
 786         const int time_smooth = 5;
 787
 788         gettimeofday(&now, NULL);
 789         sign = tv_diff(status_time, &now, &diff);
 790 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
 791 //                      sign, sa_time_diff_sign);
 792         if (!count) {
 793                 sa_time_diff_sign = sign;
 794                 sa_time_diff = diff;
 795                 count++;
 796                 return;
 797         }
 798         if (count > 5) {
 799                 int s = tv_diff(&diff, &sa_time_diff, &tmp);
 800                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
 801                         PARA_WARNING_LOG("time diff jump: %lims\n",
 802                                 s * tv2ms(&tmp));
 803         }
 804         count++;
 805         sa_time_diff_sign = tv_convex_combination(
 806                 sa_time_diff_sign * time_smooth, &sa_time_diff,
 807                 count > 10? sign : sign * time_smooth, &diff,
 808                 &tmp);
 809         sa_time_diff = tmp;
 810         PARA_INFO_LOG("time diff (cur/avg): "
 811                 "%li:%lu/%li:%lu\n",
 812                 sign * diff.tv_sec, (diff.tv_usec + 500) / 1000,
 813                 sa_time_diff_sign * sa_time_diff.tv_sec,
 814                 (sa_time_diff.tv_usec + 500)/ 1000);
 815 }
 816
 817 static void check_stat_line(char *line)
 818 {
 819         int itemnum;
 820         size_t ilen = 0;
 821         struct timeval tv;
 822         char *tmp;
 823
 824         if (!line)
 825                 return;
 826         itemnum = stat_line_valid(line);
 827         if (itemnum < 0) {
 828                 PARA_WARNING_LOG("invalid status line: %s\n", line);
 829                 return;
 830         }
 831         tmp = make_message("%s\n", line);
 832         stat_client_write(tmp, itemnum);
 833         free(tmp);
 834         free(stat_item_values[itemnum]);
 835         stat_item_values[itemnum] = para_strdup(line);
 836         ilen = strlen(status_item_list[itemnum]);
 837         switch (itemnum) {
 838         case SI_STATUS:
 839                 playing = strstr(line, "playing")? 1 : 0;
 840                 break;
 841         case SI_FORMAT:
 842                 free(af_status);
 843                 af_status = para_strdup(line + ilen + 1);
 844                 break;
 845         case SI_OFFSET:
 846                 offset_seconds = atoi(line + ilen + 1);
 847                 break;
 848         case SI_LENGTH:
 849                 length_seconds = atoi(line + ilen + 1);
 850                 break;
 851         case SI_STREAM_START:
 852                 if (sscanf(line + ilen + 1, "%lu.%lu",
 853                                 &tv.tv_sec, &tv.tv_usec) == 2)
 854                         server_stream_start = tv;
 855                 break;
 856         case SI_CURRENT_TIME:
 857                 if (sscanf(line + ilen + 1, "%lu.%lu", &tv.tv_sec,
 858                                 &tv.tv_usec) == 2)
 859                         compute_time_diff(&tv);
 860                 break;
 861         }
 862 }
 863
 864 static void handle_signal(int sig)
 865 {
 866         switch (sig) {
 867         case SIGCHLD:
 868                 return check_sigchld();
 869         case SIGINT:
 870         case SIGTERM:
 871         case SIGHUP:
 872                 PARA_EMERG_LOG("terminating on signal %d\n", sig);
 873                 clean_exit(EXIT_FAILURE, "caught deadly signal");
 874                 return;
 875         }
 876 }
 877
 878 static void check_timeouts(void)
 879 {
 880         struct timeval now;
 881         int slot_num, timeout = conf.stream_timeout_arg;
 882
 883         gettimeofday(&now, NULL);
 884         FOR_EACH_SLOT(slot_num) {
 885                 struct slot_info *s = &slot[slot_num];
 886                 if (s->format < 0)
 887                         continue;
 888                 /* check read time */
 889                 if (s->receiver_node &&
 890                         now.tv_sec > s->rtime.tv_sec + timeout) {
 891                         PARA_INFO_LOG("%s input buffer (slot %d) not ready\n",
 892                                 audio_formats[s->format], slot_num);
 893                         if (s->fci)
 894                                 s->fci->error = 42;
 895                         else
 896                                 close_receiver(slot_num);
 897                 }
 898                 /* check write time */
 899                 if (s->wpid > 0 && !s->wkilled &&
 900                         now.tv_sec > s->wtime.tv_sec + timeout) {
 901                         PARA_INFO_LOG("%s output buffer (slot %d) not ready\n",
 902                                 audio_formats[s->format], slot_num);
 903                         if (s->fci)
 904                                 s->fci->error = 42;
 905                 }
 906         }
 907 }
 908
 909 static size_t get_loaded_bytes(int slot_num)
 910 {
 911         size_t loaded = 0;
 912         struct slot_info *s = &slot[slot_num];
 913         struct receiver_node *rn = s->receiver_node;
 914
 915         if (s->format < 0)
 916                 goto out;
 917
 918         if (afi[s->format].num_filters) {
 919                 if (s->fci)
 920                         loaded = *s->fci->out_loaded;
 921         } else {
 922                 if (rn)
 923                         loaded = rn->loaded;
 924         }
 925 out:
 926         return loaded;
 927 }
 928
 929
 930 static void close_decoder_if_idle(int slot_num)
 931 {
 932         struct slot_info *s = &slot[slot_num];
 933         struct receiver_node *rn = s->receiver_node;
 934
 935         if (s->format < 0)
 936                 return;
 937         if (!s->fci)
 938                 return;
 939         if (!rn->eof && !s->fci->error && s->wpid > 0)
 940                 return;
 941         if (!s->fci->error && s->wpid > 0) { /* eof */
 942                 if (filter_io(s->fci) > 0)
 943                         return;
 944                 if (get_loaded_bytes(slot_num))
 945                         return;
 946         }
 947         if (s->write_fd > 0) {
 948                 PARA_INFO_LOG("slot %d: closing write fd %d\n", slot_num,
 949                         s->write_fd);
 950                 close(s->write_fd);
 951                 del_close_on_fork_list(s->write_fd);
 952                 s->write_fd = -1;
 953         }
 954         if (s->wpid > 0)
 955                 return; /* wait until writer dies before closing filters */
 956         PARA_INFO_LOG("closing all filters in slot %d (filter_chain %p)\n",
 957                 slot_num, s->fci);
 958         close_filters(s->fci);
 959         free(s->fci);
 960         close_receiver(slot_num);
 961         clear_slot(slot_num);
 962 }
 963
 964 static int set_stream_fds(fd_set *wfds)
 965 {
 966         int i, max_fileno = -1;
 967
 968         check_timeouts();
 969         FOR_EACH_SLOT(i) {
 970                 struct slot_info *s = &slot[i];
 971                 struct audio_format_info *a;
 972                 struct receiver_node *rn;
 973
 974                 close_decoder_if_idle(i);
 975                 s->wcheck = 0;
 976                 if (s->format < 0)
 977                         continue;
 978                 a = &afi[s->format];
 979                 rn = s->receiver_node;
 980                 if (rn && rn->loaded && !s->wpid) {
 981                         PARA_INFO_LOG("no writer in slot %d\n", i);
 982                         start_stream_writer(i);
 983                 }
 984                 if (s->write_fd <= 0)
 985                         continue;
 986                 if (!get_loaded_bytes(i))
 987                         continue;
 988                 FD_SET(s->write_fd, wfds);
 989                 s->wcheck = 1;
 990                 max_fileno = MAX(s->write_fd, max_fileno);
 991         }
 992 //      PARA_INFO_LOG("return %d\n", max_fileno);
 993         return max_fileno;
 994 }
 995
 996 static int write_audio_data(int slot_num)
 997 {
 998         struct slot_info *s = &slot[slot_num];
 999         struct audio_format_info *a = &afi[s->format];
1000         struct receiver_node *rn = s->receiver_node;
1001         int rv;
1002         char **buf;
1003         size_t *len;
1004
1005         if (a->num_filters) {
1006                 buf = &s->fci->outbuf;
1007                 len = s->fci->out_loaded;
1008         } else {
1009                 buf = &rn->buf;
1010                 len = &rn->loaded;
1011         }
1012         PARA_DEBUG_LOG("writing %p (%zd bytes)\n", *buf, *len);
1013         rv = write(s->write_fd, *buf, *len);
1014         PARA_DEBUG_LOG("wrote %d/%zd\n", rv, *len);
1015         if (rv < 0) {
1016                 PARA_WARNING_LOG("write error in slot %d (fd %d): %s\n",
1017                         slot_num, s->write_fd, strerror(errno));
1018                 *len = 0;
1019                 s->fci->error = E_WRITE_AUDIO_DATA;
1020         } else if (rv != *len) {
1021                 PARA_DEBUG_LOG("partial %s write (%i/%zd) for slot %d\n",
1022                         audio_formats[s->format], rv, *len, slot_num);
1023                 *len -= rv;
1024                 memmove(*buf, *buf + rv, *len);
1025         } else
1026                 *len = 0;
1027         if (rv > 0)
1028                 gettimeofday(&s->wtime, NULL);
1029         return rv;
1030 }
1031
1032 static void slot_io(fd_set *wfds)
1033 {
1034         int ret, i;
1035
1036         FOR_EACH_SLOT(i) {
1037                 struct slot_info *s = &slot[i];
1038                 struct receiver_node *rn = s->receiver_node;
1039
1040                 if (rn && rn->loaded)
1041                         gettimeofday(&s->rtime, NULL);
1042                 if (s->format >= 0 && s->write_fd > 0 && s->fci) {
1043                         ret = filter_io(s->fci);
1044                         if (ret < 0)
1045                                 s->fci->error = -ret;
1046 //                      PARA_DEBUG_LOG("slot %d, filter io %d bytes, check write: %d, loaded: %d/%d, eof: %d\n",
1047 //                               i, ret, s->wcheck, rn->loaded, *s->fci->out_loaded, rn->eof);
1048                 }
1049                 if (s->write_fd <= 0 || !s->wcheck || !FD_ISSET(s->write_fd, wfds))
1050                         continue;
1051                 write_audio_data(i);
1052         }
1053 }
1054
1055 static int parse_stream_command(const char *txt, char **cmd)
1056 {
1057         char *p = strchr(txt, ':');
1058         int i;
1059
1060         if (!p)
1061                 return -E_MISSING_COLON;
1062         p++;
1063         FOR_EACH_AUDIO_FORMAT(i) {
1064                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
1065                         continue;
1066                 *cmd = p;
1067                 return i;
1068         }
1069         return -E_UNSUPPORTED_AUDIO_FORMAT;
1070 }
1071
1072 static int add_filter(int format, char *cmdline)
1073 {
1074         struct audio_format_info *a = &afi[format];
1075         int filter_num, nf = a->num_filters;
1076
1077         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
1078         if (filter_num < 0)
1079                 return filter_num;
1080         a->filters[nf] = &filters[filter_num];
1081         a->num_filters++;
1082         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
1083                 a->filters[nf]->name);
1084         return filter_num;
1085 }
1086
1087 static int setup_default_filters(void)
1088 {
1089         int i, ret = 1;
1090
1091         FOR_EACH_AUDIO_FORMAT(i) {
1092                 struct audio_format_info *a = &afi[i];
1093                 char *tmp;
1094                 int j;
1095                 if (a->num_filters)
1096                         continue;
1097                 /* add "dec" to audio format name */
1098                 tmp = make_message("%sdec", audio_formats[i]);
1099                 for (j = 0; filters[j].name; j++)
1100                         if (!strcmp(tmp, filters[j].name))
1101                                 break;
1102                 free(tmp);
1103                 ret = -E_UNSUPPORTED_FILTER;
1104                 if (!filters[j].name)
1105                         goto out;
1106                 tmp = para_strdup(filters[j].name);
1107                 ret = add_filter(i, tmp);
1108                 free(tmp);
1109                 if (ret < 0)
1110                         goto out;
1111                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i], filters[j].name);
1112                 ret = add_filter(i, para_strdup("wav"));
1113                 if (ret < 0)
1114                         goto out;
1115                 PARA_INFO_LOG("%s -> default filter: wav\n", audio_formats[i]);
1116         }
1117 out:
1118         return ret;
1119 }
1120
1121 static int init_stream_io(void)
1122 {
1123         int i, ret, receiver_num;
1124         char *cmd;
1125
1126         for (i = 0; i < conf.stream_write_cmd_given; i++) {
1127                 ret = parse_stream_command(conf.stream_write_cmd_arg[i], &cmd);
1128                 if (ret < 0)
1129                         goto out;
1130                 afi[ret].write_cmd = para_strdup(cmd);
1131                 PARA_INFO_LOG("%s write command: %s\n", audio_formats[ret], afi[ret].write_cmd);
1132         }
1133         for (i = 0; receivers[i].name; i++) {
1134                 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
1135                 receivers[i].init(&receivers[i]);
1136         }
1137         for (i = 0; i < conf.receiver_given; i++) {
1138                 char *arg = conf.receiver_arg[i];
1139                 char *recv = strchr(arg, ':');
1140                 ret = -E_MISSING_COLON;
1141                 if (!recv)
1142                         goto out;
1143                 *recv = '\0';
1144                 recv++;
1145                 ret = get_audio_format_num(arg);
1146                 if (ret < 0)
1147                         goto out;
1148                 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
1149                 if (!afi[ret].receiver_conf) {
1150                         ret = -E_RECV_SYNTAX;
1151                         goto out;
1152                 }
1153                 afi[ret].receiver = &receivers[receiver_num];
1154         }
1155         /* use the first available receiver with no arguments
1156          * for those audio formats for which no receiver
1157          * was specified
1158          */
1159         cmd = para_strdup(receivers[0].name);
1160         FOR_EACH_AUDIO_FORMAT(i) {
1161                 struct audio_format_info *a = &afi[i];
1162                 if (a->receiver_conf)
1163                         continue;
1164                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
1165                 if (!a->receiver_conf)
1166                         return -E_RECV_SYNTAX;
1167                 a->receiver = &receivers[receiver_num];
1168         }
1169         free(cmd);
1170         /* filters */
1171         filter_init(filters);
1172         FOR_EACH_AUDIO_FORMAT(i) {
1173                 afi[i].filter_conf = para_malloc((conf.filter_given + 1) * sizeof(char *));
1174                 afi[i].filters = para_malloc((conf.filter_given + 1) * sizeof(struct filter *));
1175         }
1176         if (!conf.no_default_filters_given)
1177                 return setup_default_filters();
1178         for (i = 0; i < conf.filter_given; i++) {
1179                 char *arg = conf.filter_arg[i];
1180                 char *filter_name = strchr(arg, ':');
1181                 ret = -E_MISSING_COLON;
1182                 if (!filter_name)
1183                         goto out;
1184                 *filter_name = '\0';
1185                 filter_name++;
1186                 ret = get_audio_format_num(arg);
1187                 if (ret < 0)
1188                         goto out;
1189                 ret = add_filter(ret, filter_name);
1190                 if (ret < 0)
1191                         goto out;
1192         }
1193         ret = 1;
1194 out:
1195         return ret;
1196 }
1197
1198 static int dump_commands(int fd)
1199 {
1200         char *buf = para_strdup(""), *tmp = NULL;
1201         int i;
1202         ssize_t ret;
1203
1204         FOR_EACH_COMMAND(i) {
1205                 tmp = make_message("%s%s\t%s\n", buf, cmds[i].name,
1206                         cmds[i].description);
1207                 free(buf);
1208                 buf = tmp;
1209         }
1210         ret = client_write(fd, buf);
1211         free(buf);
1212         return ret;
1213 }
1214
1215 /*
1216  * command handlers don't close their fd on errors (ret < 0) so that
1217  * its caller can send an error message. Otherwise (ret >= 0) it's up
1218  * to each individual command to close the fd if necessary.
1219  */
1220
1221 static int com_help(int fd, int argc, char **argv)
1222 {
1223         int i, ret;
1224         char *buf;
1225         const char *dflt = "No such command. Available commands:\n";
1226
1227         if (argc < 2) {
1228                 ret = dump_commands(fd);
1229                 goto out;
1230         }
1231         FOR_EACH_COMMAND(i) {
1232                 if (strcmp(cmds[i].name, argv[1]))
1233                         continue;
1234                 buf = make_message(
1235                         "NAME\n\t%s -- %s\n"
1236                         "SYNOPSIS\n\tpara_audioc %s\n"
1237                         "DESCRIPTION\n%s\n",
1238                         argv[1],
1239                         cmds[i].description,
1240                         cmds[i].synopsis,
1241                         cmds[i].help
1242                 );
1243                 ret = client_write(fd, buf);
1244                 free(buf);
1245                 goto out;
1246         }
1247         ret = client_write(fd, dflt);
1248         if (ret > 0)
1249                 ret = dump_commands(fd);
1250 out:
1251         if (ret >= 0)
1252                 close(fd);
1253         return ret;
1254 }
1255
1256 static int com_stat(int fd, __unused int argc, __unused char **argv)
1257 {
1258         int i, ret;
1259         char *buf = NULL;
1260         long unsigned mask = ~0LU;
1261
1262         if (argc > 1) {
1263                 mask = 0;
1264                 for (i = 1; i < argc; i++) {
1265                         ret = stat_item_valid(argv[i]);
1266                         if (ret < 0)
1267                                 return ret;
1268                         mask |= (1 << ret);
1269                 }
1270         }
1271         PARA_INFO_LOG("mask: 0x%lx\n", mask);
1272         if (mask & (1 << SI_PLAY_TIME)) {
1273                 struct timeval *t = wstime();
1274                 char *ts = get_time_string(t);
1275                 if (ts) {
1276                         ret = client_write(fd, ts);
1277                         if (ret < 0)
1278                                 goto out;
1279                         free(ts);
1280                 }
1281         }
1282         if (mask & (1 << SI_AUDIOD_UPTIME)) {
1283                 char *tmp, *us = uptime_str();
1284                 tmp = make_message("%s:%s\n",
1285                         status_item_list[SI_AUDIOD_UPTIME], us);
1286                 free(us);
1287                 ret = client_write(fd, tmp);
1288                 if (ret < 0)
1289                         goto out;
1290                 free(tmp);
1291         }
1292         if (mask & (1 << SI_AUDIOD_STATUS)) {
1293                 char *s = audiod_status_string();
1294                 ret = client_write(fd, s);
1295                 if (ret < 0)
1296                         goto out;
1297                 free(s);
1298         }
1299         if (mask & (1 << SI_DECODER_FLAGS)) {
1300                 char *df =decoder_flags();
1301                 ret = client_write(fd, df);
1302                 if (ret < 0)
1303                         goto out;
1304                 free(df);
1305         }
1306
1307         for (i = 0; i < NUM_STAT_ITEMS; i++) {
1308                 char *tmp, *v;
1309                 if (!((1 << i) & mask))
1310                         continue;
1311                 v = stat_item_values[i];
1312                 tmp = make_message("%s%s%s", buf? buf: "",
1313                         v? v : "", v? "\n" : "");
1314                 free(buf);
1315                 buf = tmp;
1316         }
1317         ret = client_write(fd, buf);
1318 out:
1319         if (ret > 0)
1320                 ret = stat_client_add(fd, mask);
1321         free(buf);
1322         return ret;
1323 }
1324
1325 #if 0
1326 static char *list_filters(void)
1327 {
1328         int i, j;
1329         char *tmp, *msg = make_message("format\tnum\tcmd\n");
1330
1331         FOR_EACH_AUDIO_FORMAT(i) {
1332                 for (j = 0; j < afi[i].num_filters; j++) {
1333                         tmp = make_message("%s\t%i\t%s\n",
1334                                 afi[i].name, j, afi[i].filter_cmds[j]);
1335                         msg = para_strcat(msg, tmp);
1336                         free(tmp);
1337                 }
1338                 tmp = make_message("%s\t%i\t%s\n", afi[i].name,
1339                         j, afi[i].write_cmd);
1340                 msg = para_strcat(msg, tmp);
1341                 free(tmp);
1342         }
1343         return msg;
1344 }
1345 #endif
1346
1347 static int com_grab(int fd, int argc, char **argv)
1348 {
1349         struct grab_client *gc;
1350         struct filter_node *fn;
1351         int i, err;
1352         char *msg;
1353
1354         PARA_INFO_LOG("argc: %d, argv[0]: %s, optind: %d\n", argc, argv[0], optind);
1355         gc = grab_client_new(fd, argc, argv, &err);
1356         PARA_INFO_LOG("argc: %d, argv[0]: %s, optind: %d\n", argc, argv[0], optind);
1357         if (!gc)
1358                 goto err_out;
1359         fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
1360         if (fn)
1361                 activate_grab_client(gc, fn);
1362         return 1;
1363 err_out:
1364         if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
1365                 return err;
1366         if (err == -E_GC_HELP_GIVEN) {
1367                 msg = make_message("%s\n\n", grab_client_args_info_usage);
1368                 for (i = 0; grab_client_args_info_help[i]; i++) {
1369                         char *tmp = make_message("%s%s\n", msg,
1370                                 grab_client_args_info_help[i]);
1371                         free(msg);
1372                         msg = tmp;
1373                 }
1374         } else
1375                 msg = make_message("%s %s\n",
1376                         GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
1377                         GRAB_CLIENT_CMDLINE_PARSER_VERSION);
1378         err = client_write(fd, msg);
1379         free(msg);
1380         if (err < 0)
1381                 return err;
1382         close(fd);
1383         return 1;
1384 }
1385
1386 static int __noreturn com_term(int fd, __unused int argc, __unused char **argv)
1387 {
1388         close(fd);
1389         clean_exit(EXIT_SUCCESS, "terminating on user request");
1390 }
1391
1392 static int com_on(int fd, __unused int argc, __unused char **argv)
1393 {
1394         audiod_status = AUDIOD_ON;
1395         close(fd);
1396         return 1;
1397 }
1398
1399 static int com_off(int fd, __unused int argc, __unused char **argv)
1400 {
1401         audiod_status = AUDIOD_OFF;
1402         close(fd);
1403         return 1;
1404 }
1405
1406 static int com_sb(int fd, __unused int argc, __unused char **argv)
1407 {
1408         audiod_status = AUDIOD_STANDBY;
1409         close(fd);
1410         return 1;
1411 }
1412
1413 static int com_cycle(int fd, int argc, char **argv)
1414 {
1415         switch (audiod_status) {
1416                 case  AUDIOD_ON:
1417                         return com_sb(fd, argc, argv);
1418                         break;
1419                 case  AUDIOD_OFF:
1420                         return com_on(fd, argc, argv);
1421                         break;
1422                 case  AUDIOD_STANDBY:
1423                         return com_off(fd, argc, argv);
1424                         break;
1425         }
1426         close(fd);
1427         return 1;
1428 }
1429
1430 static int check_perms(struct ucred *c)
1431 {
1432         int i;
1433
1434         if (!conf.user_allow_given)
1435                 return 1;
1436         for (i = 0; i < conf.user_allow_given; i++)
1437                 if (c->uid == conf.user_allow_arg[i])
1438                         return 1;
1439         return -E_UCRED_PERM;
1440 }
1441
1442 static int handle_connect(void)
1443 {
1444         int i, argc, ret, clifd = -1;
1445         struct ucred c;
1446         char *buf = para_malloc(MAXLINE), **argv = NULL;
1447         struct sockaddr_un unix_addr;
1448
1449         ret = para_accept(audiod_socket, &unix_addr, sizeof(struct sockaddr_un));
1450         if (ret < 0)
1451                 goto out;
1452         clifd = ret;
1453         ret = recv_cred_buffer(clifd, buf, MAXLINE - 1, &c);
1454         if (ret < 0)
1455                 goto out;
1456         PARA_INFO_LOG("pid: %i, uid: %i, gid: %i, ret: %i, buf: %s\n", c.pid, c.uid, c.gid, ret, buf);
1457         buf[ret] = '\0';
1458         ret = check_perms(&c);
1459         if (ret < 0)
1460                 goto out;
1461         argc = split_args(buf, &argv, '\n');
1462         PARA_INFO_LOG("argv[0]: %s\n", argv[0]);
1463         for (i = 0; cmds[i].name; i++) {
1464                 if (strcmp(cmds[i].name, argv[0]))
1465                         continue;
1466                 ret = cmds[i].handler(clifd, argc + 1, argv);
1467                 goto out;
1468         }
1469         ret = -E_INVALID_AUDIOD_CMD; /* cmd not found */
1470 out:
1471         free(buf);
1472         free(argv);
1473         if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
1474                 char *tmp = make_message("%s\n", PARA_STRERROR(-ret));
1475                 client_write(clifd, tmp);
1476                 free(tmp);
1477                 close(clifd);
1478         }
1479         return ret;
1480 }
1481
1482 static void audiod_get_socket(void)
1483 {
1484         struct sockaddr_un unix_addr;
1485
1486         if (conf.socket_given)
1487                 socket_name = para_strdup(conf.socket_arg);
1488         else {
1489                 char *hn = para_hostname();
1490                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1491                         hn);
1492                 free(hn);
1493         }
1494         PARA_NOTICE_LOG("connecting to local socket %s\n", socket_name);
1495         if (conf.force_given)
1496                 unlink(socket_name);
1497         audiod_socket = create_pf_socket(socket_name, &unix_addr,
1498                         S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1499         if (audiod_socket < 0) {
1500                 PARA_EMERG_LOG("%s", "can not connect to socket\n");
1501                 exit(EXIT_FAILURE); /* do not unlink socket */
1502         }
1503         if (listen(audiod_socket, 5) < 0) {
1504                 PARA_EMERG_LOG("%s", "can not listen on socket\n");
1505                 exit(EXIT_FAILURE); /* do not unlink socket */
1506         }
1507         add_close_on_fork_list(audiod_socket);
1508 }
1509
1510 static int open_stat_pipe(void)
1511 {
1512         int ret, fd[3] = {-1, 1, 0};
1513         pid_t pid;
1514         ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
1515         if (ret >= 0) {
1516                 ret = fd[1];
1517                 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
1518                 add_close_on_fork_list(ret);
1519         } else
1520                 clean_exit(EXIT_FAILURE, "failed to open status pipe");
1521         return ret;
1522 }
1523
1524 static int audiod_pre_select(fd_set *rfds, fd_set *wfds, struct timeval *tv)
1525 {
1526         int i, ret, max = -1;
1527
1528         FOR_EACH_SLOT(i) {
1529                 struct slot_info *s = &slot[i];
1530                 struct audio_format_info *a;
1531                 struct receiver_node *rn = s->receiver_node;
1532                 if (s->format < 0 || !rn)
1533                         continue;
1534                 a = &afi[s->format];
1535                 ret = a->receiver->pre_select(rn, rfds, wfds, tv);
1536 //              PARA_NOTICE_LOG("%s preselect: %d\n", a->receiver->name, ret);
1537                 max = MAX(max, ret);
1538         }
1539         return max;
1540
1541 }
1542 static void audiod_post_select(int select_ret, fd_set *rfds, fd_set *wfds)
1543 {
1544         int i, ret;
1545
1546         FOR_EACH_SLOT(i) {
1547                 struct slot_info *s = &slot[i];
1548                 struct audio_format_info *a;
1549                 struct receiver_node *rn = s->receiver_node;
1550                 if (s->format < 0 || !rn || rn->eof)
1551                         continue;
1552                 a = &afi[s->format];
1553                 ret = a->receiver->post_select(rn, select_ret, rfds, wfds);
1554                 if (ret <= 0) {
1555                         if (ret)
1556                                 PARA_ERROR_LOG("%s post select failed: %s (slot %d)\n",
1557                                 a->receiver->name, PARA_STRERROR(-ret), i);
1558                         else
1559                                 PARA_INFO_LOG("eof in slot %d\n", i);
1560                         rn->eof = 1;
1561                 }
1562                 if (ret < 0 && s->fci)
1563                         s->fci->error = ret;
1564         }
1565 }
1566
1567 /* TODO: move everything before the select call to pre_select() */
1568 static void __noreturn audiod_mainloop(void)
1569 {
1570         fd_set rfds, wfds;
1571         int ret, max_fileno, sbo = 0;
1572         char status_buf[STRINGSIZE] = "";
1573         struct timeval tv;
1574 repeat:
1575         FD_ZERO(&wfds);
1576         FD_ZERO(&rfds);
1577         /* always check signal pipe and the local socket */
1578         FD_SET(signal_pipe, &rfds);
1579         max_fileno = signal_pipe;
1580         FD_SET(audiod_socket, &rfds);
1581         max_fileno = MAX(max_fileno, audiod_socket);
1582
1583         if (audiod_status != AUDIOD_ON)
1584                 kill_all_decoders();
1585         else if (playing)
1586                 start_current_receiver();
1587
1588         max_fileno = MAX(max_fileno, set_stream_fds(&wfds));
1589         /* status pipe */
1590         if (stat_pipe >= 0 && audiod_status == AUDIOD_OFF)
1591                 close_stat_pipe();
1592         if (stat_pipe < 0 && audiod_status != AUDIOD_OFF) {
1593                 stat_pipe = open_stat_pipe();
1594                 sbo = 0;
1595                 status_buf[0] = '\0';
1596         }
1597         if (stat_pipe >= 0 && audiod_status != AUDIOD_OFF) {
1598                 FD_SET(stat_pipe, &rfds);
1599                 max_fileno = MAX(max_fileno, stat_pipe);
1600         }
1601         /* local socket */
1602         tv.tv_sec = 0;
1603         tv.tv_usec = 200 * 1000;
1604         ret = audiod_pre_select(&rfds, &wfds, &tv);
1605         max_fileno = MAX(max_fileno, ret);
1606
1607         ret = para_select(max_fileno + 1, &rfds, &wfds, &tv);
1608         if (ret < 0)
1609                 goto repeat;
1610         if (audiod_status != AUDIOD_OFF)
1611                 audiod_status_dump();
1612         audiod_post_select(ret, &rfds, &wfds);
1613         /* read status pipe */
1614         if (stat_pipe >=0 && FD_ISSET(stat_pipe, &rfds)) {
1615                 ret = read(stat_pipe, status_buf + sbo, STRINGSIZE - 1 - sbo);
1616                 if (ret <= 0) {
1617                         close_stat_pipe();
1618                         /* avoid busy loop if server is down */
1619                         while (sleep(1) > 0)
1620                                 ; /* try again*/
1621                 } else {
1622                         status_buf[ret + sbo] = '\0';
1623                         sbo = for_each_line(status_buf, ret + sbo,
1624                                 &check_stat_line);
1625                 }
1626         }
1627         slot_io(&wfds);
1628         if (FD_ISSET(audiod_socket, &rfds)) {
1629                 ret = handle_connect();
1630                 if (ret < 0) {
1631                         PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1632                 }
1633         }
1634         /* signals */
1635         if (FD_ISSET(signal_pipe, &rfds)) {
1636                 int sig_nr = para_next_signal();
1637                 if (sig_nr > 0)
1638                         handle_signal(sig_nr);
1639         }
1640         goto repeat;
1641 }
1642
1643 static void set_initial_status(void)
1644 {
1645         audiod_status = AUDIOD_ON;
1646         if (!conf.mode_given)
1647                 return;
1648         if (!strcmp(conf.mode_arg, "sb")) {
1649                 audiod_status = AUDIOD_STANDBY;
1650                 return;
1651         }
1652         if (!strcmp(conf.mode_arg, "off")) {
1653                 audiod_status = AUDIOD_OFF;
1654                 return;
1655         }
1656         if (strcmp(conf.mode_arg, "on"))
1657                 PARA_WARNING_LOG("%s", "invalid mode\n");
1658 }
1659
1660 int __noreturn main(int argc, char *argv[])
1661 {
1662         char *cf;
1663         int i;
1664
1665         valid_fd_012();
1666         hostname = para_hostname();
1667         cmdline_parser(argc, argv, &conf);
1668         para_drop_privileges(conf.user_arg);
1669         cf = configfile_exists();
1670         if (cf) {
1671                 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1672                         fprintf(stderr, "parse error in config file\n");
1673                         exit(EXIT_FAILURE);
1674                 }
1675         }
1676         log_welcome("para_audiod", conf.loglevel_arg);
1677         i = init_stream_io();
1678         if (i < 0) {
1679                 fprintf(stderr, "init stream io error: %s\n",
1680                         PARA_STRERROR(-i));
1681                 exit(EXIT_FAILURE);
1682         }
1683         server_uptime(UPTIME_SET);
1684         set_initial_status();
1685         FOR_EACH_SLOT(i)
1686                 clear_slot(i);
1687         init_grabbing();
1688         setup_signal_handling();
1689         if (conf.daemon_given)
1690                 daemon_init();
1691         audiod_get_socket(); /* doesn't return on errors */
1692         audiod_mainloop();
1693 }