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