61711dc3f5591d9396ebe62496871404834dea47
[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",
613 (long unsigned)tmp.tv_sec,
614 (long unsigned)tmp.tv_usec);
615 ret = s_a_r(cmd, "STREAM_START", replacement);
616 free(replacement);
617 if (!ret)
618 goto out;
619 PARA_INFO_LOG("cmd: %s, repl: %s\n", cmd, ret);
620 out:
621 return ret;
622 }
623
624 /** get the number of filters for the given audio format */
625 int num_filters(int audio_format_num)
626 {
627 return afi[audio_format_num].num_filters;
628 }
629
630 static void open_filters(int slot_num)
631 {
632 struct slot_info *s = &slot[slot_num];
633 struct audio_format_info *a = &afi[s->format];
634 int nf = a->num_filters;
635 int i;
636
637 s->fci = para_calloc(sizeof(struct filter_chain_info));
638 INIT_LIST_HEAD(&s->fci->filters);
639 if (!nf)
640 return;
641 s->fci->inbuf = s->receiver_node->buf;
642 s->fci->in_loaded = &s->receiver_node->loaded;
643 s->fci->outbuf = s->receiver_node->buf;
644 s->fci->out_loaded = &s->receiver_node->loaded;
645 s->fci->eof = &s->receiver_node->eof;
646 for (i = 0; i < nf; i++) {
647 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
648 fn->conf = a->filter_conf[i];
649 fn->fci = s->fci;
650 fn->filter = a->filters[i];
651 INIT_LIST_HEAD(&fn->callbacks);
652 list_add_tail(&fn->node, &s->fci->filters);
653 fn->filter->open(fn);
654 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
655 audio_formats[s->format], i + 1, nf,
656 fn->filter->name, slot_num);
657 s->fci->outbuf = fn->buf;
658 s->fci->out_loaded = &fn->loaded;
659 }
660 PARA_DEBUG_LOG("output buffer for filter chain %p: %p\n", s->fci,
661 s->fci->outbuf);
662 }
663
664 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
665 {
666 struct filter_node *fn;
667 int i, j;
668
669 FOR_EACH_SLOT(i) {
670 struct slot_info *s = &slot[i];
671 if (s->format < 0 || !s->fci)
672 continue;
673 if (slot_num >= 0 && slot_num != i)
674 continue;
675 if (format >= 0 && s->format != format)
676 continue;
677 if (num_filters(i) < filternum)
678 continue;
679 /* success */
680 j = 1;
681 list_for_each_entry(fn, &s->fci->filters, node)
682 if (filternum <= 0 || j++ == filternum)
683 break;
684 return fn;
685 }
686 return NULL;
687 }
688
689 static void start_stream_writer(int slot_num)
690 {
691 int ret, fds[3] = {1, -1, -1};
692 struct slot_info *s = &slot[slot_num];
693 struct audio_format_info *a = &afi[s->format];
694 char *glob = NULL;
695
696 if (a->write_cmd)
697 glob = glob_cmd(a->write_cmd);
698 if (!glob)
699 glob = para_strdup("para_write -w alsa");
700 PARA_INFO_LOG("starting stream writer: %s\n", glob);
701 open_filters(slot_num);
702 ret = para_exec_cmdline_pid(&s->wpid, glob, fds);
703 free(glob);
704 if (ret < 0) {
705 PARA_ERROR_LOG("exec failed (%d)\n", ret);
706 return;
707 }
708 s->write_fd = fds[0];
709 add_close_on_fork_list(s->write_fd);
710 /* we write to this fd in do_select, so we need non-blocking */
711 mark_fd_nonblock(s->write_fd);
712 gettimeofday(&s->wstime, NULL);
713 current_decoder = slot_num;
714 activate_inactive_grab_clients(slot_num, s->format, &s->fci->filters);
715 }
716
717 static void open_receiver(int format)
718 {
719 struct audio_format_info *a = &afi[format];
720 struct slot_info *s;
721 int ret, slot_num;
722
723 slot_num = get_empty_slot();
724 if (slot_num < 0)
725 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
726 s = &slot[slot_num];
727 s->format = format;
728 gettimeofday(&s->rtime, NULL);
729 s->wtime = s->rtime;
730 s->receiver_node = para_calloc(sizeof(struct receiver_node));
731 s->receiver_node->conf = a->receiver_conf;
732 ret = a->receiver->open(s->receiver_node);
733 if (ret < 0) {
734 PARA_ERROR_LOG("failed to open receiver (%s)\n",
735 PARA_STRERROR(-ret));
736 free(s->receiver_node);
737 s->receiver_node = NULL;
738 return;
739 }
740 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
741 audio_formats[s->format], a->receiver->name, slot_num);
742 }
743
744 static int is_frozen(int format)
745 {
746 struct timeval now;
747 struct audio_format_info *a = &afi[format];
748
749 gettimeofday(&now, NULL);
750 return (tv_diff(&now, &a->restart_barrier, NULL) > 0)? 0 : 1;
751 }
752
753 static void start_current_receiver(void)
754 {
755 int i;
756
757 if (!af_status)
758 return;
759 i = get_audio_format_num(af_status);
760 if (i < 0)
761 return;
762 if ((decoder_running(i) & 1) || is_frozen(i))
763 return;
764 open_receiver(i);
765 }
766
767 static void compute_time_diff(const struct timeval *status_time)
768 {
769 struct timeval now, tmp, diff;
770 static int count;
771 int sign;
772 const struct timeval max_deviation = {0, 500 * 1000};
773 const int time_smooth = 5;
774
775 gettimeofday(&now, NULL);
776 sign = tv_diff(status_time, &now, &diff);
777 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
778 // sign, sa_time_diff_sign);
779 if (!count) {
780 sa_time_diff_sign = sign;
781 sa_time_diff = diff;
782 count++;
783 return;
784 }
785 if (count > 5) {
786 int s = tv_diff(&diff, &sa_time_diff, &tmp);
787 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
788 PARA_WARNING_LOG("time diff jump: %lims\n",
789 s * tv2ms(&tmp));
790 }
791 count++;
792 sa_time_diff_sign = tv_convex_combination(
793 sa_time_diff_sign * time_smooth, &sa_time_diff,
794 count > 10? sign : sign * time_smooth, &diff,
795 &tmp);
796 sa_time_diff = tmp;
797 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
798 sign > 0? "+" : "-",
799 tv2ms(&diff),
800 sa_time_diff_sign ? "+" : "-",
801 tv2ms(&sa_time_diff)
802 );
803 }
804
805 static void check_stat_line(char *line)
806 {
807 int itemnum;
808 size_t ilen = 0;
809 long unsigned sec, usec;
810 char *tmp;
811
812 PARA_INFO_LOG("line: %s\n", line);
813 if (!line)
814 return;
815 itemnum = stat_line_valid(line);
816 if (itemnum < 0) {
817 PARA_WARNING_LOG("invalid status line: %s\n", line);
818 return;
819 }
820 tmp = make_message("%s\n", line);
821 stat_client_write(tmp, itemnum);
822 free(tmp);
823 free(stat_item_values[itemnum]);
824 stat_item_values[itemnum] = para_strdup(line);
825 ilen = strlen(status_item_list[itemnum]);
826 switch (itemnum) {
827 case SI_STATUS:
828 playing = strstr(line, "playing")? 1 : 0;
829 break;
830 case SI_FORMAT:
831 free(af_status);
832 af_status = para_strdup(line + ilen + 1);
833 break;
834 case SI_OFFSET:
835 offset_seconds = atoi(line + ilen + 1);
836 break;
837 case SI_LENGTH:
838 length_seconds = atoi(line + ilen + 1);
839 break;
840 case SI_STREAM_START:
841 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
842 server_stream_start.tv_sec = sec;
843 server_stream_start.tv_usec = usec;
844 }
845 break;
846 case SI_CURRENT_TIME:
847 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
848 struct timeval tv = {sec, usec};
849 compute_time_diff(&tv);
850 }
851 break;
852 }
853 }
854
855 static void handle_signal(int sig)
856 {
857 switch (sig) {
858 case SIGCHLD:
859 return check_sigchld();
860 case SIGINT:
861 case SIGTERM:
862 case SIGHUP:
863 PARA_EMERG_LOG("terminating on signal %d\n", sig);
864 clean_exit(EXIT_FAILURE, "caught deadly signal");
865 return;
866 }
867 }
868
869 static void check_timeouts(void)
870 {
871 struct timeval now;
872 int slot_num, timeout = conf.stream_timeout_arg;
873
874 gettimeofday(&now, NULL);
875 FOR_EACH_SLOT(slot_num) {
876 struct slot_info *s = &slot[slot_num];
877 if (s->format < 0)
878 continue;
879 /* check read time */
880 if (s->receiver_node &&
881 now.tv_sec > s->rtime.tv_sec + timeout) {
882 PARA_INFO_LOG("%s input buffer (slot %d) not ready\n",
883 audio_formats[s->format], slot_num);
884 if (s->fci)
885 s->fci->error = 42;
886 else
887 close_receiver(slot_num);
888 }
889 /* check write time */
890 if (s->wpid > 0 && !s->wkilled &&
891 now.tv_sec > s->wtime.tv_sec + timeout) {
892 PARA_INFO_LOG("%s output buffer (slot %d) not ready\n",
893 audio_formats[s->format], slot_num);
894 if (s->fci)
895 s->fci->error = 42;
896 }
897 }
898 }
899
900 static size_t get_loaded_bytes(int slot_num)
901 {
902 size_t loaded = 0;
903 struct slot_info *s = &slot[slot_num];
904 struct receiver_node *rn = s->receiver_node;
905
906 if (s->format < 0)
907 goto out;
908
909 if (afi[s->format].num_filters) {
910 if (s->fci)
911 loaded = *s->fci->out_loaded;
912 } else {
913 if (rn)
914 loaded = rn->loaded;
915 }
916 out:
917 return loaded;
918 }
919
920
921 static void close_decoder_if_idle(int slot_num)
922 {
923 struct slot_info *s = &slot[slot_num];
924 struct receiver_node *rn = s->receiver_node;
925
926 if (s->format < 0)
927 return;
928 if (!s->fci)
929 return;
930 if (!rn->eof && !s->fci->error && s->wpid > 0)
931 return;
932 if (!s->fci->error && s->wpid > 0) { /* eof */
933 if (filter_io(s->fci) > 0)
934 return;
935 if (get_loaded_bytes(slot_num))
936 return;
937 }
938 if (s->write_fd > 0) {
939 PARA_INFO_LOG("slot %d: closing write fd %d\n", slot_num,
940 s->write_fd);
941 close(s->write_fd);
942 del_close_on_fork_list(s->write_fd);
943 s->write_fd = -1;
944 }
945 if (s->wpid > 0)
946 return; /* wait until writer dies before closing filters */
947 PARA_INFO_LOG("closing all filters in slot %d (filter_chain %p)\n",
948 slot_num, s->fci);
949 close_filters(s->fci);
950 free(s->fci);
951 close_receiver(slot_num);
952 clear_slot(slot_num);
953 }
954
955 static void set_stream_fds(fd_set *wfds, int *max_fileno)
956 {
957 int i;
958
959 check_timeouts();
960 FOR_EACH_SLOT(i) {
961 struct slot_info *s = &slot[i];
962 struct audio_format_info *a;
963 struct receiver_node *rn;
964
965 close_decoder_if_idle(i);
966 s->wcheck = 0;
967 if (s->format < 0)
968 continue;
969 a = &afi[s->format];
970 rn = s->receiver_node;
971 if (rn && rn->loaded && !s->wpid) {
972 PARA_INFO_LOG("no writer in slot %d\n", i);
973 start_stream_writer(i);
974 }
975 if (s->write_fd <= 0)
976 continue;
977 if (!get_loaded_bytes(i))
978 continue;
979 para_fd_set(s->write_fd, wfds, max_fileno);
980 s->wcheck = 1;
981 }
982 }
983
984 static int write_audio_data(int slot_num)
985 {
986 struct slot_info *s = &slot[slot_num];
987 struct audio_format_info *a = &afi[s->format];
988 struct receiver_node *rn = s->receiver_node;
989 int rv;
990 char **buf;
991 size_t *len;
992
993 if (a->num_filters) {
994 buf = &s->fci->outbuf;
995 len = s->fci->out_loaded;
996 } else {
997 buf = &rn->buf;
998 len = &rn->loaded;
999 }
1000 PARA_DEBUG_LOG("writing %p (%zd bytes)\n", *buf, *len);
1001 rv = write(s->write_fd, *buf, *len);
1002 PARA_DEBUG_LOG("wrote %d/%zd\n", rv, *len);
1003 if (rv < 0) {
1004 PARA_WARNING_LOG("write error in slot %d (fd %d): %s\n",
1005 slot_num, s->write_fd, strerror(errno));
1006 *len = 0;
1007 s->fci->error = E_WRITE_AUDIO_DATA;
1008 } else if (rv != *len) {
1009 PARA_DEBUG_LOG("partial %s write (%i/%zd) for slot %d\n",
1010 audio_formats[s->format], rv, *len, slot_num);
1011 *len -= rv;
1012 memmove(*buf, *buf + rv, *len);
1013 } else
1014 *len = 0;
1015 if (rv > 0)
1016 gettimeofday(&s->wtime, NULL);
1017 return rv;
1018 }
1019
1020 static void slot_io(fd_set *wfds)
1021 {
1022 int ret, i;
1023
1024 FOR_EACH_SLOT(i) {
1025 struct slot_info *s = &slot[i];
1026 struct receiver_node *rn = s->receiver_node;
1027
1028 if (rn && rn->loaded)
1029 gettimeofday(&s->rtime, NULL);
1030 if (s->format >= 0 && s->write_fd > 0 && s->fci) {
1031 ret = filter_io(s->fci);
1032 if (ret < 0)
1033 s->fci->error = -ret;
1034 // PARA_DEBUG_LOG("slot %d, filter io %d bytes, check write: %d, loaded: %d/%d, eof: %d\n",
1035 // i, ret, s->wcheck, rn->loaded, *s->fci->out_loaded, rn->eof);
1036 }
1037 if (s->write_fd <= 0 || !s->wcheck || !FD_ISSET(s->write_fd, wfds))
1038 continue;
1039 write_audio_data(i);
1040 }
1041 }
1042
1043 static int parse_stream_command(const char *txt, char **cmd)
1044 {
1045 char *p = strchr(txt, ':');
1046 int i;
1047
1048 if (!p)
1049 return -E_MISSING_COLON;
1050 p++;
1051 FOR_EACH_AUDIO_FORMAT(i) {
1052 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
1053 continue;
1054 *cmd = p;
1055 return i;
1056 }
1057 return -E_UNSUPPORTED_AUDIO_FORMAT;
1058 }
1059
1060 static int add_filter(int format, char *cmdline)
1061 {
1062 struct audio_format_info *a = &afi[format];
1063 int filter_num, nf = a->num_filters;
1064
1065 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
1066 if (filter_num < 0)
1067 return filter_num;
1068 a->filters[nf] = &filters[filter_num];
1069 a->num_filters++;
1070 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
1071 a->filters[nf]->name);
1072 return filter_num;
1073 }
1074
1075 static int setup_default_filters(void)
1076 {
1077 int i, ret = 1;
1078
1079 FOR_EACH_AUDIO_FORMAT(i) {
1080 struct audio_format_info *a = &afi[i];
1081 char *tmp;
1082 int j;
1083 if (a->num_filters)
1084 continue;
1085 /* add "dec" to audio format name */
1086 tmp = make_message("%sdec", audio_formats[i]);
1087 for (j = 0; filters[j].name; j++)
1088 if (!strcmp(tmp, filters[j].name))
1089 break;
1090 free(tmp);
1091 ret = -E_UNSUPPORTED_FILTER;
1092 if (!filters[j].name)
1093 goto out;
1094 tmp = para_strdup(filters[j].name);
1095 ret = add_filter(i, tmp);
1096 free(tmp);
1097 if (ret < 0)
1098 goto out;
1099 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i], filters[j].name);
1100 ret = add_filter(i, para_strdup("wav"));
1101 if (ret < 0)
1102 goto out;
1103 PARA_INFO_LOG("%s -> default filter: wav\n", audio_formats[i]);
1104 }
1105 out:
1106 return ret;
1107 }
1108
1109 static int init_stream_io(void)
1110 {
1111 int i, ret, receiver_num, nf;
1112 char *cmd;
1113
1114 for (i = 0; i < conf.stream_write_cmd_given; i++) {
1115 ret = parse_stream_command(conf.stream_write_cmd_arg[i], &cmd);
1116 if (ret < 0)
1117 goto out;
1118 afi[ret].write_cmd = para_strdup(cmd);
1119 PARA_INFO_LOG("%s write command: %s\n", audio_formats[ret], afi[ret].write_cmd);
1120 }
1121 for (i = 0; receivers[i].name; i++) {
1122 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
1123 receivers[i].init(&receivers[i]);
1124 }
1125 for (i = 0; i < conf.receiver_given; i++) {
1126 char *arg = conf.receiver_arg[i];
1127 char *recv = strchr(arg, ':');
1128 ret = -E_MISSING_COLON;
1129 if (!recv)
1130 goto out;
1131 *recv = '\0';
1132 recv++;
1133 ret = get_audio_format_num(arg);
1134 if (ret < 0)
1135 goto out;
1136 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
1137 if (!afi[ret].receiver_conf) {
1138 ret = -E_RECV_SYNTAX;
1139 goto out;
1140 }
1141 afi[ret].receiver = &receivers[receiver_num];
1142 }
1143 /* use the first available receiver with no arguments
1144 * for those audio formats for which no receiver
1145 * was specified
1146 */
1147 cmd = para_strdup(receivers[0].name);
1148 FOR_EACH_AUDIO_FORMAT(i) {
1149 struct audio_format_info *a = &afi[i];
1150 if (a->receiver_conf)
1151 continue;
1152 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
1153 if (!a->receiver_conf)
1154 return -E_RECV_SYNTAX;
1155 a->receiver = &receivers[receiver_num];
1156 }
1157 free(cmd);
1158 /* filters */
1159 filter_init(filters);
1160 nf = PARA_MAX(2, conf.filter_given) + 1;
1161 PARA_INFO_LOG("allocating space for %d filters\n", nf);
1162 FOR_EACH_AUDIO_FORMAT(i) {
1163 afi[i].filter_conf = para_malloc(nf * sizeof(char *));
1164 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
1165 }
1166 if (!conf.no_default_filters_given)
1167 return setup_default_filters();
1168 for (i = 0; i < conf.filter_given; i++) {
1169 char *arg = conf.filter_arg[i];
1170 char *filter_name = strchr(arg, ':');
1171 ret = -E_MISSING_COLON;
1172 if (!filter_name)
1173 goto out;
1174 *filter_name = '\0';
1175 filter_name++;
1176 ret = get_audio_format_num(arg);
1177 if (ret < 0)
1178 goto out;
1179 ret = add_filter(ret, filter_name);
1180 if (ret < 0)
1181 goto out;
1182 }
1183 ret = 1;
1184 out:
1185 return ret;
1186 }
1187
1188 static int dump_commands(int fd)
1189 {
1190 char *buf = para_strdup(""), *tmp = NULL;
1191 int i;
1192 ssize_t ret;
1193
1194 FOR_EACH_COMMAND(i) {
1195 tmp = make_message("%s%s\t%s\n", buf, cmds[i].name,
1196 cmds[i].description);
1197 free(buf);
1198 buf = tmp;
1199 }
1200 ret = client_write(fd, buf);
1201 free(buf);
1202 return ret;
1203 }
1204
1205 /*
1206 * command handlers don't close their fd on errors (ret < 0) so that
1207 * its caller can send an error message. Otherwise (ret >= 0) it's up
1208 * to each individual command to close the fd if necessary.
1209 */
1210
1211 static int com_help(int fd, int argc, char **argv)
1212 {
1213 int i, ret;
1214 char *buf;
1215 const char *dflt = "No such command. Available commands:\n";
1216
1217 if (argc < 2) {
1218 ret = dump_commands(fd);
1219 goto out;
1220 }
1221 FOR_EACH_COMMAND(i) {
1222 if (strcmp(cmds[i].name, argv[1]))
1223 continue;
1224 buf = make_message(
1225 "NAME\n\t%s -- %s\n"
1226 "SYNOPSIS\n\tpara_audioc %s\n"
1227 "DESCRIPTION\n%s\n",
1228 argv[1],
1229 cmds[i].description,
1230 cmds[i].synopsis,
1231 cmds[i].help
1232 );
1233 ret = client_write(fd, buf);
1234 free(buf);
1235 goto out;
1236 }
1237 ret = client_write(fd, dflt);
1238 if (ret > 0)
1239 ret = dump_commands(fd);
1240 out:
1241 if (ret >= 0)
1242 close(fd);
1243 return ret;
1244 }
1245
1246 static int com_stat(int fd, __a_unused int argc, __a_unused char **argv)
1247 {
1248 int i, ret;
1249 char *buf = NULL;
1250 long unsigned mask = ~0LU;
1251
1252 if (argc > 1) {
1253 mask = 0;
1254 for (i = 1; i < argc; i++) {
1255 ret = stat_item_valid(argv[i]);
1256 if (ret < 0)
1257 return ret;
1258 mask |= (1 << ret);
1259 }
1260 }
1261 PARA_INFO_LOG("mask: 0x%lx\n", mask);
1262 if (mask & (1 << SI_PLAY_TIME)) {
1263 struct timeval *t = wstime();
1264 char *ts = get_time_string(t);
1265 if (ts) {
1266 ret = client_write(fd, ts);
1267 if (ret < 0)
1268 goto out;
1269 free(ts);
1270 }
1271 }
1272 if (mask & (1 << SI_AUDIOD_UPTIME)) {
1273 char *tmp, *us = uptime_str();
1274 tmp = make_message("%s:%s\n",
1275 status_item_list[SI_AUDIOD_UPTIME], us);
1276 free(us);
1277 ret = client_write(fd, tmp);
1278 if (ret < 0)
1279 goto out;
1280 free(tmp);
1281 }
1282 if (mask & (1 << SI_AUDIOD_STATUS)) {
1283 char *s = audiod_status_string();
1284 ret = client_write(fd, s);
1285 if (ret < 0)
1286 goto out;
1287 free(s);
1288 }
1289 if (mask & (1 << SI_DECODER_FLAGS)) {
1290 char *df =decoder_flags();
1291 ret = client_write(fd, df);
1292 if (ret < 0)
1293 goto out;
1294 free(df);
1295 }
1296
1297 for (i = 0; i < NUM_STAT_ITEMS; i++) {
1298 char *tmp, *v;
1299 if (!((1 << i) & mask))
1300 continue;
1301 v = stat_item_values[i];
1302 tmp = make_message("%s%s%s", buf? buf: "",
1303 v? v : "", v? "\n" : "");
1304 free(buf);
1305 buf = tmp;
1306 }
1307 ret = client_write(fd, buf);
1308 out:
1309 if (ret > 0)
1310 ret = stat_client_add(fd, mask);
1311 free(buf);
1312 return ret;
1313 }
1314
1315 #if 0
1316 static char *list_filters(void)
1317 {
1318 int i, j;
1319 char *tmp, *msg = make_message("format\tnum\tcmd\n");
1320
1321 FOR_EACH_AUDIO_FORMAT(i) {
1322 for (j = 0; j < afi[i].num_filters; j++) {
1323 tmp = make_message("%s\t%i\t%s\n",
1324 afi[i].name, j, afi[i].filter_cmds[j]);
1325 msg = para_strcat(msg, tmp);
1326 free(tmp);
1327 }
1328 tmp = make_message("%s\t%i\t%s\n", afi[i].name,
1329 j, afi[i].write_cmd);
1330 msg = para_strcat(msg, tmp);
1331 free(tmp);
1332 }
1333 return msg;
1334 }
1335 #endif
1336
1337 static int com_grab(int fd, int argc, char **argv)
1338 {
1339 struct grab_client *gc;
1340 struct filter_node *fn;
1341 int i, err;
1342 char *msg;
1343
1344 PARA_INFO_LOG("argc: %d, argv[0]: %s, optind: %d\n", argc, argv[0], optind);
1345 gc = grab_client_new(fd, argc, argv, &err);
1346 PARA_INFO_LOG("argc: %d, argv[0]: %s, optind: %d\n", argc, argv[0], optind);
1347 if (!gc)
1348 goto err_out;
1349 fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
1350 if (fn)
1351 activate_grab_client(gc, fn);
1352 return 1;
1353 err_out:
1354 if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
1355 return err;
1356 if (err == -E_GC_HELP_GIVEN) {
1357 msg = make_message("%s\n\n", grab_client_args_info_usage);
1358 for (i = 0; grab_client_args_info_help[i]; i++) {
1359 char *tmp = make_message("%s%s\n", msg,
1360 grab_client_args_info_help[i]);
1361 free(msg);
1362 msg = tmp;
1363 }
1364 } else
1365 msg = make_message("%s %s\n",
1366 GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
1367 GRAB_CLIENT_CMDLINE_PARSER_VERSION);
1368 err = client_write(fd, msg);
1369 free(msg);
1370 if (err < 0)
1371 return err;
1372 close(fd);
1373 return 1;
1374 }
1375
1376 static int __noreturn com_term(int fd, __a_unused int argc, __a_unused char **argv)
1377 {
1378 close(fd);
1379 clean_exit(EXIT_SUCCESS, "terminating on user request");
1380 }
1381
1382 static int com_on(int fd, __a_unused int argc, __a_unused char **argv)
1383 {
1384 audiod_status = AUDIOD_ON;
1385 close(fd);
1386 return 1;
1387 }
1388
1389 static int com_off(int fd, __a_unused int argc, __a_unused char **argv)
1390 {
1391 audiod_status = AUDIOD_OFF;
1392 close(fd);
1393 return 1;
1394 }
1395
1396 static int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
1397 {
1398 audiod_status = AUDIOD_STANDBY;
1399 close(fd);
1400 return 1;
1401 }
1402
1403 static int com_cycle(int fd, int argc, char **argv)
1404 {
1405 switch (audiod_status) {
1406 case AUDIOD_ON:
1407 return com_sb(fd, argc, argv);
1408 break;
1409 case AUDIOD_OFF:
1410 return com_on(fd, argc, argv);
1411 break;
1412 case AUDIOD_STANDBY:
1413 return com_off(fd, argc, argv);
1414 break;
1415 }
1416 close(fd);
1417 return 1;
1418 }
1419
1420 static int check_perms(uid_t uid)
1421 {
1422 int i;
1423
1424 if (!conf.user_allow_given)
1425 return 1;
1426 for (i = 0; i < conf.user_allow_given; i++)
1427 if (uid == conf.user_allow_arg[i])
1428 return 1;
1429 return -E_UCRED_PERM;
1430 }
1431
1432 static int handle_connect(void)
1433 {
1434 int i, argc, ret, clifd = -1;
1435 char *buf = para_malloc(MAXLINE), **argv = NULL;
1436 struct sockaddr_un unix_addr;
1437
1438 ret = para_accept(audiod_socket, &unix_addr, sizeof(struct sockaddr_un));
1439 if (ret < 0)
1440 goto out;
1441 clifd = ret;
1442 ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
1443 if (ret < 0)
1444 goto out;
1445 PARA_INFO_LOG("connection from user %i\n", ret);
1446 ret = check_perms(ret);
1447 if (ret < 0)
1448 goto out;
1449 argc = split_args(buf, &argv, "\n");
1450 PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
1451 for (i = 0; cmds[i].name; i++) {
1452 if (strcmp(cmds[i].name, argv[0]))
1453 continue;
1454 ret = cmds[i].handler(clifd, argc, argv);
1455 goto out;
1456 }
1457 ret = -E_INVALID_AUDIOD_CMD; /* cmd not found */
1458 out:
1459 free(buf);
1460 free(argv);
1461 if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
1462 char *tmp = make_message("%s\n", PARA_STRERROR(-ret));
1463 client_write(clifd, tmp);
1464 free(tmp);
1465 close(clifd);
1466 }
1467 return ret;
1468 }
1469
1470 static void audiod_get_socket(void)
1471 {
1472 struct sockaddr_un unix_addr;
1473
1474 if (conf.socket_given)
1475 socket_name = para_strdup(conf.socket_arg);
1476 else {
1477 char *hn = para_hostname();
1478 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1479 hn);
1480 free(hn);
1481 }
1482 PARA_NOTICE_LOG("connecting to local socket %s\n", socket_name);
1483 if (conf.force_given)
1484 unlink(socket_name);
1485 audiod_socket = create_pf_socket(socket_name, &unix_addr,
1486 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1487 if (audiod_socket < 0) {
1488 PARA_EMERG_LOG("%s", "can not connect to socket\n");
1489 exit(EXIT_FAILURE); /* do not unlink socket */
1490 }
1491 if (listen(audiod_socket, 5) < 0) {
1492 PARA_EMERG_LOG("%s", "can not listen on socket\n");
1493 exit(EXIT_FAILURE); /* do not unlink socket */
1494 }
1495 add_close_on_fork_list(audiod_socket);
1496 }
1497
1498 static int open_stat_pipe(void)
1499 {
1500 int ret, fd[3] = {-1, 1, 0};
1501 pid_t pid;
1502 ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
1503 if (ret >= 0) {
1504 ret = fd[1];
1505 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
1506 add_close_on_fork_list(ret);
1507 } else
1508 clean_exit(EXIT_FAILURE, "failed to open status pipe");
1509 return ret;
1510 }
1511
1512 static void audiod_pre_select(fd_set *rfds, fd_set *wfds, struct timeval *tv,
1513 int *max_fileno)
1514 {
1515 int i, ret;
1516
1517 FOR_EACH_SLOT(i) {
1518 struct slot_info *s = &slot[i];
1519 struct audio_format_info *a;
1520 struct receiver_node *rn = s->receiver_node;
1521 if (s->format < 0 || !rn)
1522 continue;
1523 a = &afi[s->format];
1524 ret = a->receiver->pre_select(rn, rfds, wfds, tv);
1525 // PARA_NOTICE_LOG("%s preselect: %d\n", a->receiver->name, ret);
1526 *max_fileno = PARA_MAX(*max_fileno, ret);
1527 }
1528 }
1529 static void audiod_post_select(int select_ret, fd_set *rfds, fd_set *wfds)
1530 {
1531 int i, ret;
1532
1533 FOR_EACH_SLOT(i) {
1534 struct slot_info *s = &slot[i];
1535 struct audio_format_info *a;
1536 struct receiver_node *rn = s->receiver_node;
1537 if (s->format < 0 || !rn || rn->eof)
1538 continue;
1539 a = &afi[s->format];
1540 ret = a->receiver->post_select(rn, select_ret, rfds, wfds);
1541 if (ret <= 0) {
1542 if (ret)
1543 PARA_ERROR_LOG("%s post select failed: %s (slot %d)\n",
1544 a->receiver->name, PARA_STRERROR(-ret), i);
1545 else
1546 PARA_INFO_LOG("eof in slot %d\n", i);
1547 rn->eof = 1;
1548 }
1549 if (ret < 0 && s->fci)
1550 s->fci->error = ret;
1551 }
1552 }
1553
1554 /* TODO: move everything before the select call to pre_select() */
1555 static void __noreturn audiod_mainloop(void)
1556 {
1557 fd_set rfds, wfds;
1558 int ret, max_fileno, sbo = 0;
1559 char status_buf[STRINGSIZE] = "";
1560 struct timeval tv;
1561 repeat:
1562 FD_ZERO(&wfds);
1563 FD_ZERO(&rfds);
1564 /* always check signal pipe and the local socket */
1565 para_fd_set(signal_pipe, &rfds, &max_fileno);
1566 para_fd_set(audiod_socket, &rfds, &max_fileno);
1567
1568 if (audiod_status != AUDIOD_ON)
1569 kill_all_decoders();
1570 else if (playing)
1571 start_current_receiver();
1572
1573 set_stream_fds(&wfds, &max_fileno);
1574 /* status pipe */
1575 if (stat_pipe >= 0 && audiod_status == AUDIOD_OFF)
1576 close_stat_pipe();
1577 if (stat_pipe < 0 && audiod_status != AUDIOD_OFF) {
1578 stat_pipe = open_stat_pipe();
1579 sbo = 0;
1580 status_buf[0] = '\0';
1581 }
1582 if (stat_pipe >= 0 && audiod_status != AUDIOD_OFF)
1583 para_fd_set(stat_pipe, &rfds, &max_fileno);
1584 /* local socket */
1585 tv.tv_sec = 0;
1586 tv.tv_usec = 200 * 1000;
1587 audiod_pre_select(&rfds, &wfds, &tv, &max_fileno);
1588 ret = para_select(max_fileno + 1, &rfds, &wfds, &tv);
1589 if (ret < 0)
1590 goto repeat;
1591 if (audiod_status != AUDIOD_OFF)
1592 audiod_status_dump();
1593 audiod_post_select(ret, &rfds, &wfds);
1594 /* read status pipe */
1595 if (stat_pipe >=0 && FD_ISSET(stat_pipe, &rfds)) {
1596 ret = read(stat_pipe, status_buf + sbo, STRINGSIZE - 1 - sbo);
1597 if (ret <= 0) {
1598 close_stat_pipe();
1599 /* avoid busy loop if server is down */
1600 while (sleep(1) > 0)
1601 ; /* try again*/
1602 } else {
1603 status_buf[ret + sbo] = '\0';
1604 sbo = for_each_line(status_buf, ret + sbo,
1605 &check_stat_line);
1606 }
1607 }
1608 slot_io(&wfds);
1609 if (FD_ISSET(audiod_socket, &rfds)) {
1610 ret = handle_connect();
1611 if (ret < 0) {
1612 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1613 }
1614 }
1615 /* signals */
1616 if (FD_ISSET(signal_pipe, &rfds)) {
1617 int sig_nr = para_next_signal();
1618 if (sig_nr > 0)
1619 handle_signal(sig_nr);
1620 }
1621 goto repeat;
1622 }
1623
1624 static void set_initial_status(void)
1625 {
1626 audiod_status = AUDIOD_ON;
1627 if (!conf.mode_given)
1628 return;
1629 if (!strcmp(conf.mode_arg, "sb")) {
1630 audiod_status = AUDIOD_STANDBY;
1631 return;
1632 }
1633 if (!strcmp(conf.mode_arg, "off")) {
1634 audiod_status = AUDIOD_OFF;
1635 return;
1636 }
1637 if (strcmp(conf.mode_arg, "on"))
1638 PARA_WARNING_LOG("%s", "invalid mode\n");
1639 }
1640
1641 int __noreturn main(int argc, char *argv[])
1642 {
1643 char *cf;
1644 int i;
1645
1646 fprintf(stderr, "argc: %d\n", argc);
1647 valid_fd_012();
1648 hostname = para_hostname();
1649 cmdline_parser(argc, argv, &conf);
1650 para_drop_privileges(conf.user_arg, conf.group_arg);
1651 cf = configfile_exists();
1652 if (cf) {
1653 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1654 PARA_EMERG_LOG("%s", "parse error in config file\n");
1655 exit(EXIT_FAILURE);
1656 }
1657 }
1658 if (conf.logfile_given)
1659 logfile = open_log(conf.logfile_arg);
1660 log_welcome("para_audiod", conf.loglevel_arg);
1661 i = init_stream_io();
1662 if (i < 0) {
1663 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1664 exit(EXIT_FAILURE);
1665 }
1666 server_uptime(UPTIME_SET);
1667 set_initial_status();
1668 FOR_EACH_SLOT(i)
1669 clear_slot(i);
1670 init_grabbing();
1671 setup_signal_handling();
1672 if (conf.daemon_given)
1673 daemon_init();
1674 audiod_get_socket(); /* doesn't return on errors */
1675 audiod_mainloop();
1676 }