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