741bd68b0344c510ecdd750e897aedfa25b9ee48
[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
38 /** define the array of error lists needed by para_audiod */
39 INIT_AUDIOD_ERRLISTS;
40 /** define the array containing all supported audio formats */
41 DEFINE_AUDIO_FORMAT_ARRAY;
42
43 /**
44 * the possible modes of operation
45 *
46 * - off: disconnect from para_server
47 * - on: receive status information from para_server and play the audio stream
48 * - sb: only receive status information but not the audio stream
49 */
50 enum {AUDIOD_OFF, AUDIOD_ON, AUDIOD_STANDBY};
51
52 /** defines how to handle one supported audio format */
53 struct audio_format_info {
54 /** pointer to the receiver for this audio format */
55 struct receiver *receiver;
56 /** the receiver configuration */
57 void *receiver_conf;
58 /** the number of filters that should be activated for this audio format */
59 unsigned int num_filters;
60 /** pointer to the array of filters to be activated */
61 struct filter **filters;
62 /** pointer to the array of filter configurations */
63 void **filter_conf;
64 /** output of the last filter is written to stdin of this command */
65 char *write_cmd;
66 /** do not start receiver/filters/writer before this time */
67 struct timeval restart_barrier;
68 };
69
70 /**
71 * describes one instance of a receiver-filter-writer chain
72 *
73 * \sa receier_node, receiver, filter, filter_node, filter_chain_info
74 */
75 struct slot_info {
76 /** number of the audio format in this slot */
77 int format;
78 /** the file descriptor of the writer */
79 int write_fd;
80 /** the process id of the writer */
81 pid_t wpid;
82 /** time of the last successful read from the receiver */
83 struct timeval rtime;
84 /** time the last write to the write fd happend */
85 struct timeval wtime;
86 /** writer start time */
87 struct timeval wstime;
88 /** did we include \a write_fd in the fdset */
89 int wcheck;
90 /** set to one if we have sent the TERM signal to \a wpid */
91 int wkilled;
92 /** the receiver info associated with this slot */
93 struct receiver_node *receiver_node;
94 /** the active filter chain */
95 struct filter_chain_info *fci;
96 };
97
98 static struct slot_info slot[MAX_STREAM_SLOTS];
99
100 /** defines one command of para_audiod */
101 struct audiod_command {
102 /** the name of the command */
103 const char *name;
104 /** pointer to the function that handles the command */
105 int (*handler)(int, int, char**);
106 /** one-line description of the command */
107 const char *description;
108 /** summary of the command line options */
109 const char *synopsis;
110 /** the long help text */
111 const char *help;
112 };
113
114 extern const char *status_item_list[NUM_STAT_ITEMS];
115
116 static int com_grab(int, int, char **);
117 static int com_cycle(int, int, char **);
118 static int com_help(int, int, char **);
119 static int com_off(int, int, char **);
120 static int com_on(int, int, char **);
121 static int com_sb(int, int, char **);
122 static int com_stat(int, int, char **);
123 static int com_term(int, int, char **);
124 static int stat_pipe = -1, signal_pipe;
125
126 static struct gengetopt_args_info conf;
127 static struct timeval server_stream_start, sa_time_diff;
128 static int playing, current_decoder = -1,
129 audiod_status = AUDIOD_ON, offset_seconds, length_seconds,
130 sa_time_diff_sign = 1, audiod_socket = -1;
131 static char *af_status, /* the audio format announced in server status */
132 *socket_name, *hostname;
133 static char *stat_item_values[NUM_STAT_ITEMS];
134 static FILE *logfile;
135 static const struct timeval restart_delay = {0, 300 * 1000};
136
137 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
138
139 static struct audiod_command cmds[] = {
140 {
141 .name = "cycle",
142 .handler = com_cycle,
143 .description = "switch to next mode",
144 .synopsis = "cycle",
145 .help =
146
147 "on -> standby -> off -> on\n"
148
149 },
150 {
151 .name = "grab",
152 .handler = com_grab,
153 .description = "grab the audio stream",
154 .synopsis = "-- grab [grab_options]",
155 .help =
156 "grab ('splice') the audio stream at any position in the filter \n"
157 "chain and send that data back to the client. \n"
158 "Available options:\n\n"
159 GRAB_HELP_TXT
160 },
161 {
162 .name = "help",
163 .handler = com_help,
164 .description = "display command list or help for given command",
165 .synopsis = "help [command]",
166 .help =
167
168 "When I was younger, so much younger than today, I never needed\n"
169 "anybody's help in any way. But now these days are gone, I'm not so\n"
170 "self assured. Now I find I've changed my mind and opened up the doors.\n"
171 "\n"
172 " -- Beatles: Help\n"
173
174 },
175 {
176 .name = "off",
177 .handler = com_off,
178 .description = "deactivate para_audiod",
179 .synopsis = "off",
180 .help =
181
182 "Close connection to para_server and stop all decoders.\n"
183
184 },
185 {
186 .name = "on",
187 .handler = com_on,
188 .description = "activate para_audiod",
189 .synopsis = "on",
190 .help =
191
192 "Establish connection to para_server, retrieve para_server's current\n"
193 "status. If playing, start corresponding decoder. Otherwise stop\n"
194 "all decoders.\n"
195
196 },
197 {
198 .name = "sb",
199 .handler = com_sb,
200 .description = "enter standby mode",
201 .synopsis = "sb",
202 .help =
203
204 "Stop all decoders but leave connection to para_server open.\n"
205
206 },
207 {
208 .name = "stat",
209 .handler = com_stat,
210 .description = "print status information",
211 .synopsis = "stat [item1 ...]",
212 .help =
213
214 "Dump given status items (all if none given) to stdout.\n"
215
216 },
217 {
218 .name = "term",
219 .handler = com_term,
220 .description = "terminate audiod",
221 .synopsis = "term",
222 .help =
223
224 "Stop all decoders, shut down connection to para_server and exit.\n"
225
226 },
227 {
228 .name = NULL,
229 }
230 };
231
232 /** iterate over all slots */
233 #define FOR_EACH_SLOT(slot) for (slot = 0; slot < MAX_STREAM_SLOTS; slot++)
234 /** iterate over all supported audio formats */
235 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
236 /** iterate over the array of all audiod commands */
237 #define FOR_EACH_COMMAND(c) for (c = 0; cmds[c].name; c++)
238
239 /**
240 * get the audio format number
241 * \param name the name of the audio format
242 *
243 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
244 * \a name is not a supported audio format.
245 */
246 int get_audio_format_num(char *name)
247 {
248 int i;
249 FOR_EACH_AUDIO_FORMAT(i)
250 if (!strcmp(name, audio_formats[i]))
251 return i;
252 return -E_UNSUPPORTED_AUDIO_FORMAT;
253 }
254
255 /*
256 * log function. first argument is loglevel.
257 */
258 void para_log(int ll, const char* fmt,...)
259 {
260 va_list argp;
261 FILE *outfd;
262 struct tm *tm;
263 time_t t1;
264 char str[MAXLINE] = "";
265
266 if (ll < conf.loglevel_arg)
267 return;
268 if (!logfile && conf.logfile_given)
269 logfile = open_log(conf.logfile_arg);
270 if (!logfile && conf.daemon_given)
271 return;
272 if (!logfile) {
273 if (ll < WARNING)
274 outfd = stdout;
275 else
276 outfd = stderr;
277 } else
278 outfd = logfile;
279 time(&t1);
280 tm = localtime(&t1);
281 strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
282 fprintf(outfd, "%s %s ", str, hostname);
283 if (conf.loglevel_arg <= INFO)
284 fprintf(outfd, "%i ", ll);
285 va_start(argp, fmt);
286 vfprintf(outfd, fmt, argp);
287 va_end(argp);
288 }
289
290 static int client_write(int fd, const char *buf)
291 {
292 size_t len = strlen(buf);
293 return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
294 }
295
296 static char *get_time_string(struct timeval *newest_stime)
297 {
298 struct timeval now, diff, adj_stream_start, tmp;
299 int total = 0, use_server_time = 1;
300
301 if (!playing) {
302 if (length_seconds)
303 return NULL;
304 return make_message("%s:\n", status_item_list[SI_PLAY_TIME]);
305 }
306 if (audiod_status == AUDIOD_OFF)
307 goto out;
308 if (sa_time_diff_sign > 0)
309 tv_diff(&server_stream_start, &sa_time_diff,
310 &adj_stream_start);
311 else
312 tv_add(&server_stream_start, &sa_time_diff,
313 &adj_stream_start);
314 tmp = adj_stream_start;
315 if (newest_stime && audiod_status == AUDIOD_ON) {
316 tv_diff(newest_stime, &adj_stream_start, &diff);
317 if (tv2ms(&diff) < 5000) {
318 tmp = *newest_stime;
319 use_server_time = 0;
320 }
321 }
322 gettimeofday(&now, NULL);
323 tv_diff(&now, &tmp, &diff);
324 total = diff.tv_sec + offset_seconds;
325 if (total > length_seconds)
326 total = length_seconds;
327 if (total < 0)
328 total = 0;
329 out:
330 return make_message(
331 "%s:%s%d:%02d [%d:%02d] (%d%%/%d:%02d)\n",
332 status_item_list[SI_PLAY_TIME],
333 use_server_time? "~" : "",
334 total / 60,
335 total % 60,
336 (length_seconds - total) / 60,
337 (length_seconds - total) % 60,
338 length_seconds? (total * 100 + length_seconds / 2) /
339 length_seconds : 0,
340 length_seconds / 60,
341 length_seconds % 60
342 );
343 }
344
345 __malloc static char *audiod_status_string(void)
346 {
347 const char *status = (audiod_status == AUDIOD_ON)?
348 "on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
349 return make_message("%s:%s\n", status_item_list[SI_AUDIOD_STATUS], status);
350 }
351
352 static struct timeval *wstime(void)
353 {
354 int i;
355 struct timeval *max = NULL;
356 FOR_EACH_SLOT(i) {
357 struct slot_info *s = &slot[i];
358 if (s->wpid <= 0)
359 continue;
360 if (max && tv_diff(&s->wstime, max, NULL) <= 0)
361 continue;
362 max = &s->wstime;
363 }
364 return max;
365 }
366 __malloc static char *decoder_flags(void)
367 {
368 int i;
369 char decoder_flags[MAX_STREAM_SLOTS + 1];
370
371 FOR_EACH_SLOT(i) {
372 struct slot_info *s = &slot[i];
373 char flag = '0';
374 if (s->receiver_node)
375 flag += 1;
376 if (s->wpid > 0)
377 flag += 2;
378 if (flag != '0')
379 flag += s->format * 4;
380 decoder_flags[i] = flag;
381 }
382 decoder_flags[MAX_STREAM_SLOTS] = '\0';
383 return make_message("%s:%s\n", status_item_list[SI_DECODER_FLAGS],
384 decoder_flags);
385 }
386
387 static char *configfile_exists(void)
388 {
389 static char *config_file;
390
391 if (!config_file) {
392 char *home = para_homedir();
393 config_file = make_message("%s/.paraslash/audiod.conf", home);
394 free(home);
395 }
396 return file_exists(config_file)? config_file : NULL;
397 }
398
399 static void setup_signal_handling(void)
400 {
401 signal_pipe = para_signal_init();
402 PARA_INFO_LOG("signal pipe: fd %d\n", signal_pipe);
403 para_install_sighandler(SIGINT);
404 para_install_sighandler(SIGTERM);
405 para_install_sighandler(SIGCHLD);
406 para_install_sighandler(SIGHUP);
407 signal(SIGPIPE, SIG_IGN);
408 }
409
410 static void audiod_status_dump(void)
411 {
412 static char *p_ts, *p_us, *p_as, *p_df;
413 struct timeval *t = wstime();
414 char *us, *tmp = get_time_string(t);
415
416 if (tmp && (!p_ts || strcmp(tmp, p_ts)))
417 stat_client_write(tmp, SI_PLAY_TIME);
418 free(p_ts);
419 p_ts = tmp;
420
421 us = uptime_str();
422 tmp = make_message("%s:%s\n", status_item_list[SI_AUDIOD_UPTIME], us);
423 free(us);
424 if (!p_us || strcmp(p_us, tmp))
425 stat_client_write(tmp, SI_AUDIOD_UPTIME);
426 free(p_us);
427 p_us = tmp;
428
429 tmp = audiod_status_string();
430 if (!p_as || strcmp(p_as, tmp))
431 stat_client_write(tmp, SI_AUDIOD_STATUS);
432 free(p_as);
433 p_as = tmp;
434
435 tmp = decoder_flags();
436 if (!p_df || strcmp(p_df, tmp))
437 stat_client_write(tmp, SI_DECODER_FLAGS);
438 free(p_df);
439 p_df = tmp;
440 }
441
442 static void clear_slot(int slot_num)
443 {
444 struct slot_info *s = &slot[slot_num];
445
446 PARA_INFO_LOG("clearing slot %d\n", slot_num);
447 memset(s, 0, sizeof(struct slot_info));
448 s->format = -1;
449 }
450
451 static void kill_stream_writer(int slot_num)
452 {
453 struct slot_info *s = &slot[slot_num];
454
455 if (s->format < 0 || s->wkilled || s->wpid <= 0)
456 return;
457 PARA_DEBUG_LOG("kill -TERM %d (%s stream writer in slot %d)\n",
458 s->wpid, audio_formats[s->format], slot_num);
459 kill(s->wpid, SIGTERM);
460 s->wkilled = 1;
461 s->fci->error = 1;
462 }
463
464 static void set_restart_barrier(int format, struct timeval *now)
465 {
466 struct timeval tmp;
467
468 if (now)
469 tmp = *now;
470 else
471 gettimeofday(&tmp, NULL);
472 tv_add(&tmp, &restart_delay, &afi[format].restart_barrier);
473 }
474
475 static void close_receiver(int slot_num)
476 {
477 struct slot_info *s = &slot[slot_num];
478 struct audio_format_info *a;
479
480 if (s->format < 0 || !s->receiver_node)
481 return;
482 a = &afi[s->format];
483 PARA_NOTICE_LOG("closing %s recevier in slot %d\n",
484 audio_formats[s->format] , slot_num);
485 a->receiver->close(s->receiver_node);
486 free(s->receiver_node);
487 s->receiver_node = NULL;
488 set_restart_barrier(s->format, NULL);
489 }
490
491 static void kill_all_decoders(void)
492 {
493 int i;
494
495 FOR_EACH_SLOT(i)
496 if (slot[i].format >= 0) {
497 PARA_INFO_LOG("stopping decoder in slot %d\n", i);
498 kill_stream_writer(i);
499 }
500 }
501
502 static void check_sigchld(void)
503 {
504 pid_t pid;
505 int i;
506 struct timeval now;
507 gettimeofday(&now, NULL);
508
509 reap_next_child:
510 pid = para_reap_child();
511 if (pid <= 0)
512 return;
513 FOR_EACH_SLOT(i) {
514 struct slot_info *s = &slot[i];
515 long lifetime;
516 if (s->format < 0)
517 continue;
518 if (pid == s->wpid) {
519 s->wpid = -1;
520 lifetime = now.tv_sec - s->wstime.tv_sec;
521 PARA_INFO_LOG("%s stream writer in slot %d died "
522 "after %li secs\n",
523 audio_formats[s->format], i, lifetime);
524 set_restart_barrier(s->format, &now);
525 goto reap_next_child;
526 }
527 }
528 PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
529 goto reap_next_child;
530 }
531
532 static int get_empty_slot(void)
533 {
534 int i;
535 struct slot_info *s;
536
537 FOR_EACH_SLOT(i) {
538 s = &slot[i];
539 if (s->format < 0) {
540 clear_slot(i);
541 return i;
542 }
543 if (s->write_fd > 0 || s->wpid > 0)
544 continue;
545 if (s->receiver_node)
546 continue;
547 if (s->fci)
548 continue;
549 clear_slot(i);
550 return i;
551 }
552 return -E_NO_MORE_SLOTS;
553 }
554
555 static int decoder_running(int format)
556 {
557 int i, ret = 0;
558 struct slot_info *s;
559
560 FOR_EACH_SLOT(i) {
561 s = &slot[i];
562 if (s->format == format && s->receiver_node)
563 ret |= 1;
564 if (s->format == format && s->wpid > 0)
565 ret |= 2;
566 }
567 return ret;
568 }
569
570 static void close_stat_pipe(void)
571 {
572 int i;
573
574 if (stat_pipe < 0)
575 return;
576 PARA_NOTICE_LOG("%s", "closing status pipe\n");
577 close(stat_pipe);
578 del_close_on_fork_list(stat_pipe);
579 stat_pipe = -1;
580 kill_all_decoders();
581 for (i = 0; i < NUM_STAT_ITEMS; i++) {
582 free(stat_item_values[i]);
583 stat_item_values[i] = NULL;
584 }
585 dump_empty_status();
586 length_seconds = 0;
587 offset_seconds = 0;
588 audiod_status_dump();
589 playing = 0;
590 stat_item_values[SI_STATUS_BAR] = make_message("%s:no connection to para_server\n",
591 status_item_list[SI_STATUS_BAR]);
592 stat_client_write(stat_item_values[SI_STATUS_BAR], SI_STATUS_BAR);
593 }
594
595 static void __noreturn clean_exit(int status, const char *msg)
596 {
597 PARA_EMERG_LOG("%s\n", msg);
598 kill_all_decoders();
599 if (socket_name)
600 unlink(socket_name);
601 if (stat_pipe >= 0)
602 close_stat_pipe();
603 exit(status);
604 }
605
606 __malloc static char *glob_cmd(char *cmd)
607 {
608 char *ret, *replacement;
609 struct timeval tmp, delay, rss; /* real stream start */
610
611 delay.tv_sec = conf.stream_delay_arg / 1000;
612 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
613 // PARA_INFO_LOG("delay: %lu:%lu\n", delay.tv_sec, delay.tv_usec);
614 if (sa_time_diff_sign < 0)
615 tv_add(&server_stream_start, &sa_time_diff, &rss);
616 else
617 tv_diff(&server_stream_start, &sa_time_diff, &rss);
618 tv_add(&rss, &delay, &tmp);
619 replacement = make_message("%lu:%lu", tmp.tv_sec, tmp.tv_usec);
620 ret = s_a_r(cmd, "STREAM_START", replacement);
621 free(replacement);
622 if (!ret)
623 goto out;
624 PARA_INFO_LOG("cmd: %s, repl: %s\n", cmd, ret);
625 {
626 struct timeval now;
627 gettimeofday(&now, NULL);
628 PARA_INFO_LOG("now: %lu:%lu\n", now.tv_sec, now.tv_usec);
629 }
630 out:
631 return ret;
632 }
633
634 /** get the number of filters for the given audio format */
635 int num_filters(int audio_format_num)
636 {
637 return afi[audio_format_num].num_filters;
638 }
639
640 static void open_filters(int slot_num)
641 {
642 struct slot_info *s = &slot[slot_num];
643 struct audio_format_info *a = &afi[s->format];
644 int nf = a->num_filters;
645 int i;
646
647 s->fci = para_calloc(sizeof(struct filter_chain_info));
648 INIT_LIST_HEAD(&s->fci->filters);
649 if (!nf)
650 return;
651 s->fci->inbuf = s->receiver_node->buf;
652 s->fci->in_loaded = &s->receiver_node->loaded;
653 s->fci->outbuf = s->receiver_node->buf;
654 s->fci->out_loaded = &s->receiver_node->loaded;
655 s->fci->eof = &s->receiver_node->eof;
656 for (i = 0; i < nf; i++) {
657 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
658 fn->conf = a->filter_conf[i];
659 fn->fci = s->fci;
660 fn->filter = a->filters[i];
661 INIT_LIST_HEAD(&fn->callbacks);
662 list_add_tail(&fn->node, &s->fci->filters);
663 fn->filter->open(fn);
664 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
665 audio_formats[s->format], i + 1, nf,
666 fn->filter->name, slot_num);
667 s->fci->outbuf = fn->buf;
668 s->fci->out_loaded = &fn->loaded;
669 }
670 PARA_DEBUG_LOG("output buffer for filter chain %p: %p\n", s->fci,
671 s->fci->outbuf);
672 }
673
674 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
675 {
676 struct filter_node *fn;
677 int i, j;
678
679 FOR_EACH_SLOT(i) {
680 struct slot_info *s = &slot[i];
681 if (s->format < 0 || !s->fci)
682 continue;
683 if (slot_num >= 0 && slot_num != i)
684 continue;
685 if (format >= 0 && s->format != format)
686 continue;
687 if (num_filters(i) < filternum)
688 continue;
689 /* success */
690 j = 1;
691 list_for_each_entry(fn, &s->fci->filters, node)
692 if (filternum <= 0 || j++ == filternum)
693 break;
694 return fn;
695 }
696 return NULL;
697 }
698
699 static void start_stream_writer(int slot_num)
700 {
701 int ret, fds[3] = {1, -1, -1};
702 struct slot_info *s = &slot[slot_num];
703 struct audio_format_info *a = &afi[s->format];
704 char *glob = NULL;
705
706 if (a->write_cmd)
707 glob = glob_cmd(a->write_cmd);
708 if (!glob)
709 glob = para_strdup("para_play");
710 PARA_INFO_LOG("starting stream writer: %s\n", glob);
711 open_filters(slot_num);
712 ret = para_exec_cmdline_pid(&s->wpid, glob, fds);
713 free(glob);
714 if (ret < 0) {
715 PARA_ERROR_LOG("exec failed (%d)\n", ret);
716 return;
717 }
718 s->write_fd = fds[0];
719 add_close_on_fork_list(s->write_fd);
720 /* we write to this fd in do_select, so we need non-blocking */
721 fcntl(s->write_fd, F_SETFL, O_NONBLOCK);
722 gettimeofday(&s->wstime, NULL);
723 current_decoder = slot_num;
724 activate_inactive_grab_clients(slot_num, s->format, &s->fci->filters);
725 }
726
727 static void open_receiver(int format)
728 {
729 struct audio_format_info *a = &afi[format];
730 struct slot_info *s;
731 int ret, slot_num;
732
733 slot_num = get_empty_slot();
734 if (slot_num < 0)
735 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
736 s = &slot[slot_num];
737 s->format = format;
738 gettimeofday(&s->rtime, NULL);
739 s->wtime = s->rtime;
740 s->receiver_node = para_calloc(sizeof(struct receiver_node));
741 s->receiver_node->conf = a->receiver_conf;
742 ret = a->receiver->open(s->receiver_node);
743 if (ret < 0) {
744 PARA_ERROR_LOG("failed to open receiver (%s)\n",
745 PARA_STRERROR(-ret));
746 free(s->receiver_node);
747 s->receiver_node = NULL;
748 return;
749 }
750 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
751 audio_formats[s->format], a->receiver->name, slot_num);
752 }
753
754 static int is_frozen(int format)
755 {
756 struct timeval now;
757 struct audio_format_info *a = &afi[format];
758
759 gettimeofday(&now, NULL);
760 return (tv_diff(&now, &a->restart_barrier, NULL) > 0)? 0 : 1;
761 }
762
763 static void start_current_receiver(void)
764 {
765 int i;
766
767 if (!af_status)
768 return;
769 i = get_audio_format_num(af_status);
770 if (i < 0)
771 return;
772 if ((decoder_running(i) & 1) || is_frozen(i))
773 return;
774 open_receiver(i);
775 }
776
777 static void compute_time_diff(const struct timeval *status_time)
778 {
779 struct timeval now, tmp, diff;
780 static int count;
781 int sign;
782 const struct timeval max_deviation = {0, 500 * 1000};
783 const int time_smooth = 5;
784
785 gettimeofday(&now, NULL);
786 sign = tv_diff(status_time, &now, &diff);
787 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
788 // sign, sa_time_diff_sign);
789 if (!count) {
790 sa_time_diff_sign = sign;
791 sa_time_diff = diff;
792 count++;
793 return;
794 }
795 if (count > 5) {
796 int s = tv_diff(&diff, &sa_time_diff, &tmp);
797 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
798 PARA_WARNING_LOG("time diff jump: %lims\n",
799 s * tv2ms(&tmp));
800 }
801 count++;
802 sa_time_diff_sign = tv_convex_combination(
803 sa_time_diff_sign * time_smooth, &sa_time_diff,
804 count > 10? sign : sign * time_smooth, &diff,
805 &tmp);
806 sa_time_diff = tmp;
807 PARA_INFO_LOG("time diff (cur/avg): "
808 "%li:%lu/%li:%lu\n",
809 sign * diff.tv_sec, (diff.tv_usec + 500) / 1000,
810 sa_time_diff_sign * sa_time_diff.tv_sec,
811 (sa_time_diff.tv_usec + 500)/ 1000);
812 }
813
814 static void check_stat_line(char *line)
815 {
816 int itemnum;
817 size_t ilen = 0;
818 struct timeval tv;
819 char *tmp;
820
821 if (!line)
822 return;
823 itemnum = stat_line_valid(line);
824 if (itemnum < 0) {
825 PARA_WARNING_LOG("invalid status line: %s\n", line);
826 return;
827 }
828 tmp = make_message("%s\n", line);
829 stat_client_write(tmp, itemnum);
830 free(tmp);
831 free(stat_item_values[itemnum]);
832 stat_item_values[itemnum] = para_strdup(line);
833 ilen = strlen(status_item_list[itemnum]);
834 switch (itemnum) {
835 case SI_STATUS:
836 playing = strstr(line, "playing")? 1 : 0;
837 break;
838 case SI_FORMAT:
839 free(af_status);
840 af_status = para_strdup(line + ilen + 1);
841 break;
842 case SI_OFFSET:
843 offset_seconds = atoi(line + ilen + 1);
844 break;
845 case SI_LENGTH:
846 length_seconds = atoi(line + ilen + 1);
847 break;
848 case SI_STREAM_START:
849 if (sscanf(line + ilen + 1, "%lu.%lu",
850 &tv.tv_sec, &tv.tv_usec) == 2)
851 server_stream_start = tv;
852 break;
853 case SI_CURRENT_TIME:
854 if (sscanf(line + ilen + 1, "%lu.%lu", &tv.tv_sec,
855 &tv.tv_usec) == 2)
856 compute_time_diff(&tv);
857 break;
858 }
859 }
860
861 static void handle_signal(int sig)
862 {
863 switch (sig) {
864 case SIGCHLD:
865 return check_sigchld();
866 case SIGINT:
867 case SIGTERM:
868 case SIGHUP:
869 PARA_EMERG_LOG("terminating on signal %d\n", sig);
870 clean_exit(EXIT_FAILURE, "caught deadly signal");
871 return;
872 }
873 }
874
875 static void check_timeouts(void)
876 {
877 struct timeval now;
878 int slot_num, timeout = conf.stream_timeout_arg;
879
880 gettimeofday(&now, NULL);
881 FOR_EACH_SLOT(slot_num) {
882 struct slot_info *s = &slot[slot_num];
883 if (s->format < 0)
884 continue;
885 /* check read time */
886 if (s->receiver_node &&
887 now.tv_sec > s->rtime.tv_sec + timeout) {
888 PARA_INFO_LOG("%s input buffer (slot %d) not ready\n",
889 audio_formats[s->format], slot_num);
890 if (s->fci)
891 s->fci->error = 42;
892 else
893 close_receiver(slot_num);
894 }
895 /* check write time */
896 if (s->wpid > 0 && !s->wkilled &&
897 now.tv_sec > s->wtime.tv_sec + timeout) {
898 PARA_INFO_LOG("%s output buffer (slot %d) not ready\n",
899 audio_formats[s->format], slot_num);
900 if (s->fci)
901 s->fci->error = 42;
902 }
903 }
904 }
905
906 static size_t get_loaded_bytes(int slot_num)
907 {
908 size_t loaded = 0;
909 struct slot_info *s = &slot[slot_num];
910 struct receiver_node *rn = s->receiver_node;
911
912 if (s->format < 0)
913 goto out;
914
915 if (afi[s->format].num_filters) {
916 if (s->fci)
917 loaded = *s->fci->out_loaded;
918 } else {
919 if (rn)
920 loaded = rn->loaded;
921 }
922 out:
923 return loaded;
924 }
925
926
927 static void close_decoder_if_idle(int slot_num)
928 {
929 struct slot_info *s = &slot[slot_num];
930 struct receiver_node *rn = s->receiver_node;
931
932 if (s->format < 0)
933 return;
934 if (!s->fci)
935 return;
936 if (!rn->eof && !s->fci->error && s->wpid > 0)
937 return;
938 if (!s->fci->error && s->wpid > 0) { /* eof */
939 if (filter_io(s->fci) > 0)
940 return;
941 if (get_loaded_bytes(slot_num))
942 return;
943 }
944 if (s->write_fd > 0) {
945 PARA_INFO_LOG("slot %d: closing write fd %d\n", slot_num,
946 s->write_fd);
947 close(s->write_fd);
948 del_close_on_fork_list(s->write_fd);
949 s->write_fd = -1;
950 }
951 if (s->wpid > 0)
952 return; /* wait until writer dies before closing filters */
953 PARA_INFO_LOG("closing all filters in slot %d (filter_chain %p)\n",
954 slot_num, s->fci);
955 close_filters(s->fci);
956 free(s->fci);
957 close_receiver(slot_num);
958 clear_slot(slot_num);
959 }
960
961 static int set_stream_fds(fd_set *wfds)
962 {
963 int i, max_fileno = -1;
964
965 check_timeouts();
966 FOR_EACH_SLOT(i) {
967 struct slot_info *s = &slot[i];
968 struct audio_format_info *a;
969 struct receiver_node *rn;
970
971 close_decoder_if_idle(i);
972 s->wcheck = 0;
973 if (s->format < 0)
974 continue;
975 a = &afi[s->format];
976 rn = s->receiver_node;
977 if (rn && rn->loaded && !s->wpid) {
978 PARA_INFO_LOG("no writer in slot %d\n", i);
979 start_stream_writer(i);
980 }
981 if (s->write_fd <= 0)
982 continue;
983 if (!get_loaded_bytes(i))
984 continue;
985 FD_SET(s->write_fd, wfds);
986 s->wcheck = 1;
987 max_fileno = MAX(s->write_fd, max_fileno);
988 }
989 // PARA_INFO_LOG("return %d\n", max_fileno);
990 return max_fileno;
991 }
992
993 static int write_audio_data(int slot_num)
994 {
995 struct slot_info *s = &slot[slot_num];
996 struct audio_format_info *a = &afi[s->format];
997 struct receiver_node *rn = s->receiver_node;
998 int rv;
999 char **buf;
1000 size_t *len;
1001
1002 if (a->num_filters) {
1003 buf = &s->fci->outbuf;
1004 len = s->fci->out_loaded;
1005 } else {
1006 buf = &rn->buf;
1007 len = &rn->loaded;
1008 }
1009 PARA_DEBUG_LOG("writing %p (%zd bytes)\n", *buf, *len);
1010 rv = write(s->write_fd, *buf, *len);
1011 PARA_DEBUG_LOG("wrote %d/%zd\n", rv, *len);
1012 if (rv < 0) {
1013 PARA_WARNING_LOG("write error in slot %d (fd %d): %s\n",
1014 slot_num, s->write_fd, strerror(errno));
1015 *len = 0;
1016 s->fci->error = E_WRITE_AUDIO_DATA;
1017 } else if (rv != *len) {
1018 PARA_DEBUG_LOG("partial %s write (%i/%zd) for slot %d\n",
1019 audio_formats[s->format], rv, *len, slot_num);
1020 *len -= rv;
1021 memmove(*buf, *buf + rv, *len);
1022 } else
1023 *len = 0;
1024 if (rv > 0)
1025 gettimeofday(&s->wtime, NULL);
1026 return rv;
1027 }
1028
1029 static void slot_io(fd_set *wfds)
1030 {
1031 int ret, i;
1032
1033 FOR_EACH_SLOT(i) {
1034 struct slot_info *s = &slot[i];
1035 struct receiver_node *rn = s->receiver_node;
1036
1037 if (rn && rn->loaded)
1038 gettimeofday(&s->rtime, NULL);
1039 if (s->format >= 0 && s->write_fd > 0 && s->fci) {
1040 ret = filter_io(s->fci);
1041 if (ret < 0)
1042 s->fci->error = -ret;
1043 // PARA_DEBUG_LOG("slot %d, filter io %d bytes, check write: %d, loaded: %d/%d, eof: %d\n",
1044 // i, ret, s->wcheck, rn->loaded, *s->fci->out_loaded, rn->eof);
1045 }
1046 if (s->write_fd <= 0 || !s->wcheck || !FD_ISSET(s->write_fd, wfds))
1047 continue;
1048 write_audio_data(i);
1049 }
1050 }
1051
1052 static int parse_stream_command(const char *txt, char **cmd)
1053 {
1054 char *p = strchr(txt, ':');
1055 int i;
1056
1057 if (!p)
1058 return -E_MISSING_COLON;
1059 p++;
1060 FOR_EACH_AUDIO_FORMAT(i) {
1061 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
1062 continue;
1063 *cmd = p;
1064 return i;
1065 }
1066 return -E_UNSUPPORTED_AUDIO_FORMAT;
1067 }
1068
1069 static int add_filter(int format, char *cmdline)
1070 {
1071 struct audio_format_info *a = &afi[format];
1072 int filter_num, nf = a->num_filters;
1073
1074 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
1075 if (filter_num < 0)
1076 return filter_num;
1077 a->filters[nf] = &filters[filter_num];
1078 a->num_filters++;
1079 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
1080 a->filters[nf]->name);
1081 return filter_num;
1082 }
1083
1084 static int setup_default_filters(void)
1085 {
1086 int i, ret = 1;
1087
1088 FOR_EACH_AUDIO_FORMAT(i) {
1089 struct audio_format_info *a = &afi[i];
1090 char *tmp;
1091 int j;
1092 if (a->num_filters)
1093 continue;
1094 /* add "dec" to audio format name */
1095 tmp = make_message("%sdec", audio_formats[i]);
1096 for (j = 0; filters[j].name; j++)
1097 if (!strcmp(tmp, filters[j].name))
1098 break;
1099 free(tmp);
1100 ret = -E_UNSUPPORTED_FILTER;
1101 if (!filters[j].name)
1102 goto out;
1103 tmp = para_strdup(filters[j].name);
1104 ret = add_filter(i, tmp);
1105 free(tmp);
1106 if (ret < 0)
1107 goto out;
1108 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i], filters[j].name);
1109 ret = add_filter(i, para_strdup("wav"));
1110 if (ret < 0)
1111 goto out;
1112 PARA_INFO_LOG("%s -> default filter: wav\n", audio_formats[i]);
1113 }
1114 out:
1115 return ret;
1116 }
1117
1118 static int init_stream_io(void)
1119 {
1120 int i, ret, receiver_num;
1121 char *cmd;
1122
1123 for (i = 0; i < conf.stream_write_cmd_given; i++) {
1124 ret = parse_stream_command(conf.stream_write_cmd_arg[i], &cmd);
1125 if (ret < 0)
1126 goto out;
1127 afi[ret].write_cmd = para_strdup(cmd);
1128 PARA_INFO_LOG("%s write command: %s\n", audio_formats[ret], afi[ret].write_cmd);
1129 }
1130 for (i = 0; receivers[i].name; i++) {
1131 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
1132 receivers[i].init(&receivers[i]);
1133 }
1134 for (i = 0; i < conf.receiver_given; i++) {
1135 char *arg = conf.receiver_arg[i];
1136 char *recv = strchr(arg, ':');
1137 ret = -E_MISSING_COLON;
1138 if (!recv)
1139 goto out;
1140 *recv = '\0';
1141 recv++;
1142 ret = get_audio_format_num(arg);
1143 if (ret < 0)
1144 goto out;
1145 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
1146 if (!afi[ret].receiver_conf) {
1147 ret = -E_RECV_SYNTAX;
1148 goto out;
1149 }
1150 afi[ret].receiver = &receivers[receiver_num];
1151 }
1152 /* use the first available receiver with no arguments
1153 * for those audio formats for which no receiver
1154 * was specified
1155 */
1156 cmd = para_strdup(receivers[0].name);
1157 FOR_EACH_AUDIO_FORMAT(i) {
1158 struct audio_format_info *a = &afi[i];
1159 if (a->receiver_conf)
1160 continue;
1161 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
1162 if (!a->receiver_conf)
1163 return -E_RECV_SYNTAX;
1164 a->receiver = &receivers[receiver_num];
1165 }
1166 free(cmd);
1167 /* filters */
1168 filter_init(filters);
1169 FOR_EACH_AUDIO_FORMAT(i) {
1170 afi[i].filter_conf = para_malloc((conf.filter_given + 1) * sizeof(char *));
1171 afi[i].filters = para_malloc((conf.filter_given + 1) * sizeof(struct filter *));
1172 }
1173 if (!conf.no_default_filters_given)
1174 return setup_default_filters();
1175 for (i = 0; i < conf.filter_given; i++) {
1176 char *arg = conf.filter_arg[i];
1177 char *filter_name = strchr(arg, ':');
1178 ret = -E_MISSING_COLON;
1179 if (!filter_name)
1180 goto out;
1181 *filter_name = '\0';
1182 filter_name++;
1183 ret = get_audio_format_num(arg);
1184 if (ret < 0)
1185 goto out;
1186 ret = add_filter(ret, filter_name);
1187 if (ret < 0)
1188 goto out;
1189 }
1190 ret = 1;
1191 out:
1192 return ret;
1193 }
1194
1195 static int dump_commands(int fd)
1196 {
1197 char *buf = para_strdup(""), *tmp = NULL;
1198 int i;
1199 ssize_t ret;
1200
1201 FOR_EACH_COMMAND(i) {
1202 tmp = make_message("%s%s\t%s\n", buf, cmds[i].name,
1203 cmds[i].description);
1204 free(buf);
1205 buf = tmp;
1206 }
1207 ret = client_write(fd, buf);
1208 free(buf);
1209 return ret;
1210 }
1211
1212 /*
1213 * command handlers don't close their fd on errors (ret < 0) so that
1214 * its caller can send an error message. Otherwise (ret >= 0) it's up
1215 * to each individual command to close the fd if necessary.
1216 */
1217
1218 static int com_help(int fd, int argc, char **argv)
1219 {
1220 int i, ret;
1221 char *buf;
1222 const char *dflt = "No such command. Available commands:\n";
1223
1224 if (argc < 2) {
1225 ret = dump_commands(fd);
1226 goto out;
1227 }
1228 FOR_EACH_COMMAND(i) {
1229 if (strcmp(cmds[i].name, argv[1]))
1230 continue;
1231 buf = make_message(
1232 "NAME\n\t%s -- %s\n"
1233 "SYNOPSIS\n\tpara_audioc %s\n"
1234 "DESCRIPTION\n%s\n",
1235 argv[1],
1236 cmds[i].description,
1237 cmds[i].synopsis,
1238 cmds[i].help
1239 );
1240 ret = client_write(fd, buf);
1241 free(buf);
1242 goto out;
1243 }
1244 ret = client_write(fd, dflt);
1245 if (ret > 0)
1246 ret = dump_commands(fd);
1247 out:
1248 if (ret >= 0)
1249 close(fd);
1250 return ret;
1251 }
1252
1253 static int com_stat(int fd, __unused int argc, __unused char **argv)
1254 {
1255 int i, ret;
1256 char *buf = NULL;
1257 long unsigned mask = ~0LU;
1258
1259 if (argc > 1) {
1260 mask = 0;
1261 for (i = 1; i < argc; i++) {
1262 ret = stat_item_valid(argv[i]);
1263 if (ret < 0)
1264 return ret;
1265 mask |= (1 << ret);
1266 }
1267 }
1268 PARA_INFO_LOG("mask: 0x%lx\n", mask);
1269 if (mask & (1 << SI_PLAY_TIME)) {
1270 struct timeval *t = wstime();
1271 char *ts = get_time_string(t);
1272 if (ts) {
1273 ret = client_write(fd, ts);
1274 if (ret < 0)
1275 goto out;
1276 free(ts);
1277 }
1278 }
1279 if (mask & (1 << SI_AUDIOD_UPTIME)) {
1280 char *tmp, *us = uptime_str();
1281 tmp = make_message("%s:%s\n",
1282 status_item_list[SI_AUDIOD_UPTIME], us);
1283 free(us);
1284 ret = client_write(fd, tmp);
1285 if (ret < 0)
1286 goto out;
1287 free(tmp);
1288 }
1289 if (mask & (1 << SI_AUDIOD_STATUS)) {
1290 char *s = audiod_status_string();
1291 ret = client_write(fd, s);
1292 if (ret < 0)
1293 goto out;
1294 free(s);
1295 }
1296 if (mask & (1 << SI_DECODER_FLAGS)) {
1297 char *df =decoder_flags();
1298 ret = client_write(fd, df);
1299 if (ret < 0)
1300 goto out;
1301 free(df);
1302 }
1303
1304 for (i = 0; i < NUM_STAT_ITEMS; i++) {
1305 char *tmp, *v;
1306 if (!((1 << i) & mask))
1307 continue;
1308 v = stat_item_values[i];
1309 tmp = make_message("%s%s%s", buf? buf: "",
1310 v? v : "", v? "\n" : "");
1311 free(buf);
1312 buf = tmp;
1313 }
1314 ret = client_write(fd, buf);
1315 out:
1316 if (ret > 0)
1317 ret = stat_client_add(fd, mask);
1318 free(buf);
1319 return ret;
1320 }
1321
1322 #if 0
1323 static char *list_filters(void)
1324 {
1325 int i, j;
1326 char *tmp, *msg = make_message("format\tnum\tcmd\n");
1327
1328 FOR_EACH_AUDIO_FORMAT(i) {
1329 for (j = 0; j < afi[i].num_filters; j++) {
1330 tmp = make_message("%s\t%i\t%s\n",
1331 afi[i].name, j, afi[i].filter_cmds[j]);
1332 msg = para_strcat(msg, tmp);
1333 free(tmp);
1334 }
1335 tmp = make_message("%s\t%i\t%s\n", afi[i].name,
1336 j, afi[i].write_cmd);
1337 msg = para_strcat(msg, tmp);
1338 free(tmp);
1339 }
1340 return msg;
1341 }
1342 #endif
1343
1344 static int com_grab(int fd, int argc, char **argv)
1345 {
1346 struct grab_client *gc;
1347 struct filter_node *fn;
1348 int err;
1349
1350 PARA_INFO_LOG("argc: %d, argv[0]: %s, optind: %d\n", argc, argv[0], optind);
1351 gc = grab_client_new(fd, argc, argv, &err);
1352 PARA_INFO_LOG("argc: %d, argv[0]: %s, optind: %d\n", argc, argv[0], optind);
1353 if (!gc)
1354 goto err_out;
1355 fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
1356 if (fn)
1357 activate_grab_client(gc, fn);
1358 return 1;
1359 err_out:
1360 if (err != -E_GC_HELP_GIVEN)
1361 return err;
1362 err = client_write(fd, "Usage: para_audioc [audioc_options] -- "
1363 "grab [grab_options]\nAvailable options:\n");
1364 if (err < 0)
1365 return err;
1366 err = client_write(fd, GRAB_HELP_TXT);
1367 if (err < 0)
1368 return err;
1369 close(fd);
1370 return 1;
1371 }
1372
1373 static int __noreturn com_term(int fd, __unused int argc, __unused char **argv)
1374 {
1375 close(fd);
1376 clean_exit(EXIT_SUCCESS, "terminating on user request");
1377 }
1378
1379 static int com_on(int fd, __unused int argc, __unused char **argv)
1380 {
1381 audiod_status = AUDIOD_ON;
1382 close(fd);
1383 return 1;
1384 }
1385
1386 static int com_off(int fd, __unused int argc, __unused char **argv)
1387 {
1388 audiod_status = AUDIOD_OFF;
1389 close(fd);
1390 return 1;
1391 }
1392
1393 static int com_sb(int fd, __unused int argc, __unused char **argv)
1394 {
1395 audiod_status = AUDIOD_STANDBY;
1396 close(fd);
1397 return 1;
1398 }
1399
1400 static int com_cycle(int fd, int argc, char **argv)
1401 {
1402 switch (audiod_status) {
1403 case AUDIOD_ON:
1404 return com_sb(fd, argc, argv);
1405 break;
1406 case AUDIOD_OFF:
1407 return com_on(fd, argc, argv);
1408 break;
1409 case AUDIOD_STANDBY:
1410 return com_off(fd, argc, argv);
1411 break;
1412 }
1413 close(fd);
1414 return 1;
1415 }
1416
1417 static int check_perms(struct ucred *c)
1418 {
1419 int i;
1420
1421 if (!conf.user_allow_given)
1422 return 1;
1423 for (i = 0; i < conf.user_allow_given; i++)
1424 if (c->uid == conf.user_allow_arg[i])
1425 return 1;
1426 return -E_UCRED_PERM;
1427 }
1428
1429 static int handle_connect(void)
1430 {
1431 int i, argc, ret, clifd = -1;
1432 struct ucred c;
1433 char *buf = para_malloc(MAXLINE), **argv = NULL;
1434 struct sockaddr_un unix_addr;
1435
1436 ret = para_accept(audiod_socket, &unix_addr, sizeof(struct sockaddr_un));
1437 if (ret < 0)
1438 goto out;
1439 clifd = ret;
1440 ret = recv_cred_buffer(clifd, buf, MAXLINE - 1, &c);
1441 if (ret < 0)
1442 goto out;
1443 PARA_INFO_LOG("pid: %i, uid: %i, gid: %i, ret: %i, buf: %s\n", c.pid, c.uid, c.gid, ret, buf);
1444 buf[ret] = '\0';
1445 ret = check_perms(&c);
1446 if (ret < 0)
1447 goto out;
1448 argc = split_args(buf, &argv, '\n');
1449 PARA_INFO_LOG("argv[0]: %s\n", argv[0]);
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 + 1, 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 int pre_select(fd_set *rfds, fd_set *wfds, struct timeval *tv)
1512 {
1513 int i, ret, max = -1;
1514
1515 FOR_EACH_SLOT(i) {
1516 struct slot_info *s = &slot[i];
1517 struct audio_format_info *a;
1518 struct receiver_node *rn = s->receiver_node;
1519 if (s->format < 0 || !rn)
1520 continue;
1521 a = &afi[s->format];
1522 ret = a->receiver->pre_select(rn, rfds, wfds, tv);
1523 // PARA_NOTICE_LOG("%s preselect: %d\n", a->receiver->name, ret);
1524 max = MAX(max, ret);
1525 }
1526 return max;
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(&rfds);
1563 FD_ZERO(&wfds);
1564 max_fileno = 0;
1565 if (audiod_status != AUDIOD_ON)
1566 kill_all_decoders();
1567 else if (playing)
1568 start_current_receiver();
1569 max_fileno = set_stream_fds(&wfds);
1570 /* stat pipe (read) */
1571 if (stat_pipe >= 0 && audiod_status == AUDIOD_OFF)
1572 close_stat_pipe();
1573 if (stat_pipe < 0 && audiod_status != AUDIOD_OFF) {
1574 stat_pipe = open_stat_pipe();
1575 sbo = 0;
1576 status_buf[0] = '\0';
1577 }
1578 if (stat_pipe >= 0 && audiod_status != AUDIOD_OFF) {
1579 FD_SET(stat_pipe, &rfds);
1580 max_fileno = MAX(max_fileno, stat_pipe);
1581 }
1582 /* always check signal pipe */
1583 FD_SET(signal_pipe, &rfds);
1584 max_fileno = MAX(max_fileno, signal_pipe);
1585 /* local socket */
1586 if (audiod_socket < 0)
1587 audiod_get_socket(); /* doesn't return on errors */
1588 FD_SET(audiod_socket, &rfds);
1589 max_fileno = MAX(max_fileno, audiod_socket);
1590 tv.tv_sec = 0;
1591 tv.tv_usec = 200 * 1000;
1592 ret = pre_select(&rfds, &wfds, &tv);
1593 max_fileno = MAX(max_fileno, ret);
1594 ret = select(max_fileno + 1, &rfds, &wfds, NULL, &tv);
1595 if (ret < 0 && errno != EINTR)
1596 PARA_ERROR_LOG("select returned %d (%s)\n", ret,
1597 strerror(errno));
1598 if (audiod_status != AUDIOD_OFF)
1599 audiod_status_dump();
1600 if (ret < 0)
1601 goto repeat;
1602 audiod_post_select(ret, &rfds, &wfds);
1603 /* read status pipe */
1604 if (stat_pipe >=0 && FD_ISSET(stat_pipe, &rfds)) {
1605 ret = read(stat_pipe, status_buf + sbo, STRINGSIZE - 1 - sbo);
1606 if (ret <= 0) {
1607 close_stat_pipe();
1608 /* avoid busy loop if server is down */
1609 while (sleep(1) > 0)
1610 ; /* try again*/
1611 } else {
1612 status_buf[ret + sbo] = '\0';
1613 sbo = for_each_line(status_buf, ret + sbo,
1614 &check_stat_line);
1615 }
1616 }
1617 slot_io(&wfds);
1618 if (FD_ISSET(audiod_socket, &rfds)) {
1619 ret = handle_connect();
1620 if (ret < 0) {
1621 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1622 }
1623 }
1624 /* signals */
1625 if (FD_ISSET(signal_pipe, &rfds)) {
1626 int sig_nr = para_next_signal();
1627 if (sig_nr > 0)
1628 handle_signal(sig_nr);
1629 }
1630 goto repeat;
1631 }
1632
1633 static void set_initial_status(void)
1634 {
1635 audiod_status = AUDIOD_ON;
1636 if (!conf.mode_given)
1637 return;
1638 if (!strcmp(conf.mode_arg, "sb")) {
1639 audiod_status = AUDIOD_STANDBY;
1640 return;
1641 }
1642 if (!strcmp(conf.mode_arg, "off")) {
1643 audiod_status = AUDIOD_OFF;
1644 return;
1645 }
1646 if (strcmp(conf.mode_arg, "on"))
1647 PARA_WARNING_LOG("%s", "invalid mode\n");
1648 }
1649
1650 int __noreturn main(int argc, char *argv[])
1651 {
1652 char *cf;
1653 int i;
1654
1655 valid_fd_012();
1656 hostname = para_hostname();
1657 cmdline_parser(argc, argv, &conf);
1658 para_drop_privileges(conf.user_arg);
1659 cf = configfile_exists();
1660 if (cf) {
1661 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1662 fprintf(stderr, "parse error in config file\n");
1663 exit(EXIT_FAILURE);
1664 }
1665 }
1666 log_welcome("para_audiod", conf.loglevel_arg);
1667 i = init_stream_io();
1668 if (i < 0) {
1669 fprintf(stderr, "init stream io error: %s\n",
1670 PARA_STRERROR(-i));
1671 exit(EXIT_FAILURE);
1672 }
1673 server_uptime(UPTIME_SET);
1674 set_initial_status();
1675 FOR_EACH_SLOT(i)
1676 clear_slot(i);
1677 init_grabbing();
1678 setup_signal_handling();
1679 if (conf.daemon_given)
1680 daemon_init();
1681 audiod_mainloop();
1682 }