first version of the universal paraslash scheduler
[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 int (*line_handler)(int, char*);
108 /** one-line description of the command */
109 const char *description;
110 /** summary of the command line options */
111 const char *synopsis;
112 /** the long help text */
113 const char *help;
114 };
115
116 extern const char *status_item_list[NUM_STAT_ITEMS];
117
118 static int com_grab(int, char *);
119 static int com_cycle(int, int, char **);
120 static int com_help(int, int, char **);
121 static int com_off(int, int, char **);
122 static int com_on(int, int, char **);
123 static int com_sb(int, int, char **);
124 static int com_stat(int, int, char **);
125 static int com_term(int, int, char **);
126 static int stat_pipe = -1, signal_pipe;
127
128 static struct gengetopt_args_info conf;
129 static struct timeval server_stream_start, sa_time_diff;
130 static int playing, current_decoder = -1,
131 audiod_status = AUDIOD_ON, offset_seconds, length_seconds,
132 sa_time_diff_sign = 1, audiod_socket = -1;
133 static char *af_status, /* the audio format announced in server status */
134 *socket_name, *hostname;
135 static char *stat_item_values[NUM_STAT_ITEMS];
136 static FILE *logfile;
137 static const struct timeval restart_delay = {0, 300 * 1000};
138
139 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
140
141 static struct audiod_command cmds[] = {
142 {
143 .name = "cycle",
144 .handler = com_cycle,
145 .description = "switch to next mode",
146 .synopsis = "cycle",
147 .help =
148
149 "on -> standby -> off -> on\n"
150
151 },
152 {
153 .name = "grab",
154 .line_handler = com_grab,
155 .description = "grab the audio stream",
156 .synopsis = "-- grab [grab_options]",
157 .help =
158
159 "grab ('splice') the audio stream at any position in the filter \n"
160 "chain and send that data back to the client. Try\n"
161 "\t para_audioc -- grab -h\n"
162 "for the list of available options.\n"
163 },
164
165 {
166 .name = "help",
167 .handler = com_help,
168 .description = "display command list or help for given command",
169 .synopsis = "help [command]",
170 .help =
171
172 "When I was younger, so much younger than today, I never needed\n"
173 "anybody's help in any way. But now these days are gone, I'm not so\n"
174 "self assured. Now I find I've changed my mind and opened up the doors.\n"
175 "\n"
176 " -- Beatles: Help\n"
177
178 },
179 {
180 .name = "off",
181 .handler = com_off,
182 .description = "deactivate para_audiod",
183 .synopsis = "off",
184 .help =
185
186 "Close connection to para_server and stop all decoders.\n"
187
188 },
189 {
190 .name = "on",
191 .handler = com_on,
192 .description = "activate para_audiod",
193 .synopsis = "on",
194 .help =
195
196 "Establish connection to para_server, retrieve para_server's current\n"
197 "status. If playing, start corresponding decoder. Otherwise stop\n"
198 "all decoders.\n"
199
200 },
201 {
202 .name = "sb",
203 .handler = com_sb,
204 .description = "enter standby mode",
205 .synopsis = "sb",
206 .help =
207
208 "Stop all decoders but leave connection to para_server open.\n"
209
210 },
211 {
212 .name = "stat",
213 .handler = com_stat,
214 .description = "print status information",
215 .synopsis = "stat [item1 ...]",
216 .help =
217
218 "Dump given status items (all if none given) to stdout.\n"
219
220 },
221 {
222 .name = "term",
223 .handler = com_term,
224 .description = "terminate audiod",
225 .synopsis = "term",
226 .help =
227
228 "Stop all decoders, shut down connection to para_server and exit.\n"
229
230 },
231 {
232 .name = NULL,
233 }
234 };
235
236 /** iterate over all slots */
237 #define FOR_EACH_SLOT(slot) for (slot = 0; slot < MAX_STREAM_SLOTS; slot++)
238 /** iterate over all supported audio formats */
239 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
240 /** iterate over the array of all audiod commands */
241 #define FOR_EACH_COMMAND(c) for (c = 0; cmds[c].name; c++)
242
243 /**
244 * get the audio format number
245 * \param name the name of the audio format
246 *
247 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
248 * \a name is not a supported audio format.
249 */
250 int get_audio_format_num(char *name)
251 {
252 int i;
253 FOR_EACH_AUDIO_FORMAT(i)
254 if (!strcmp(name, audio_formats[i]))
255 return i;
256 return -E_UNSUPPORTED_AUDIO_FORMAT;
257 }
258
259 /*
260 * log function. first argument is loglevel.
261 */
262 void para_log(int ll, const char* fmt,...)
263 {
264 va_list argp;
265 FILE *outfd;
266 struct tm *tm;
267 time_t t1;
268 char str[MAXLINE] = "";
269
270 if (ll < conf.loglevel_arg)
271 return;
272 outfd = logfile? logfile : stderr;
273 time(&t1);
274 tm = localtime(&t1);
275 strftime(str, MAXLINE, "%b %d %H:%M:%S", tm);
276 fprintf(outfd, "%s %s ", str, hostname);
277 if (conf.loglevel_arg <= INFO)
278 fprintf(outfd, "%i ", ll);
279 va_start(argp, fmt);
280 vfprintf(outfd, fmt, argp);
281 va_end(argp);
282 }
283
284 static int client_write(int fd, const char *buf)
285 {
286 size_t len = strlen(buf);
287 return write(fd, buf, len) != len? -E_CLIENT_WRITE: 1;
288 }
289
290 static char *get_time_string(struct timeval *newest_stime)
291 {
292 struct timeval now, diff, adj_stream_start, tmp;
293 int total = 0, use_server_time = 1;
294
295 if (!playing) {
296 if (length_seconds)
297 return NULL;
298 return make_message("%s:\n", status_item_list[SI_PLAY_TIME]);
299 }
300 if (audiod_status == AUDIOD_OFF)
301 goto out;
302 if (sa_time_diff_sign > 0)
303 tv_diff(&server_stream_start, &sa_time_diff,
304 &adj_stream_start);
305 else
306 tv_add(&server_stream_start, &sa_time_diff,
307 &adj_stream_start);
308 tmp = adj_stream_start;
309 if (newest_stime && audiod_status == AUDIOD_ON) {
310 tv_diff(newest_stime, &adj_stream_start, &diff);
311 if (tv2ms(&diff) < 5000) {
312 tmp = *newest_stime;
313 use_server_time = 0;
314 }
315 }
316 gettimeofday(&now, NULL);
317 tv_diff(&now, &tmp, &diff);
318 total = diff.tv_sec + offset_seconds;
319 if (total > length_seconds)
320 total = length_seconds;
321 if (total < 0)
322 total = 0;
323 out:
324 return make_message(
325 "%s:%s%d:%02d [%d:%02d] (%d%%/%d:%02d)\n",
326 status_item_list[SI_PLAY_TIME],
327 use_server_time? "~" : "",
328 total / 60,
329 total % 60,
330 (length_seconds - total) / 60,
331 (length_seconds - total) % 60,
332 length_seconds? (total * 100 + length_seconds / 2) /
333 length_seconds : 0,
334 length_seconds / 60,
335 length_seconds % 60
336 );
337 }
338
339 __malloc static char *audiod_status_string(void)
340 {
341 const char *status = (audiod_status == AUDIOD_ON)?
342 "on" : (audiod_status == AUDIOD_OFF)? "off": "sb";
343 return make_message("%s:%s\n", status_item_list[SI_AUDIOD_STATUS], status);
344 }
345
346 static struct timeval *wstime(void)
347 {
348 int i;
349 struct timeval *max = NULL;
350 FOR_EACH_SLOT(i) {
351 struct slot_info *s = &slot[i];
352 if (s->wpid <= 0)
353 continue;
354 if (max && tv_diff(&s->wstime, max, NULL) <= 0)
355 continue;
356 max = &s->wstime;
357 }
358 return max;
359 }
360 __malloc static char *decoder_flags(void)
361 {
362 int i;
363 char decoder_flags[MAX_STREAM_SLOTS + 1];
364
365 FOR_EACH_SLOT(i) {
366 struct slot_info *s = &slot[i];
367 char flag = '0';
368 if (s->receiver_node)
369 flag += 1;
370 if (s->wpid > 0)
371 flag += 2;
372 decoder_flags[i] = flag;
373 }
374 decoder_flags[MAX_STREAM_SLOTS] = '\0';
375 return make_message("%s:%s\n", status_item_list[SI_DECODER_FLAGS],
376 decoder_flags);
377 }
378
379 static char *configfile_exists(void)
380 {
381 static char *config_file;
382
383 if (!config_file) {
384 char *home = para_homedir();
385 config_file = make_message("%s/.paraslash/audiod.conf", home);
386 free(home);
387 }
388 return file_exists(config_file)? config_file : NULL;
389 }
390
391 static void setup_signal_handling(void)
392 {
393 signal_pipe = para_signal_init();
394 PARA_INFO_LOG("signal pipe: fd %d\n", signal_pipe);
395 para_install_sighandler(SIGINT);
396 para_install_sighandler(SIGTERM);
397 para_install_sighandler(SIGCHLD);
398 para_install_sighandler(SIGHUP);
399 signal(SIGPIPE, SIG_IGN);
400 }
401
402 static void audiod_status_dump(void)
403 {
404 static char *p_ts, *p_us, *p_as, *p_df;
405 struct timeval *t = wstime();
406 char *us, *tmp = get_time_string(t);
407
408 if (tmp && (!p_ts || strcmp(tmp, p_ts)))
409 stat_client_write(tmp, SI_PLAY_TIME);
410 free(p_ts);
411 p_ts = tmp;
412
413 us = uptime_str();
414 tmp = make_message("%s:%s\n", status_item_list[SI_AUDIOD_UPTIME], us);
415 free(us);
416 if (!p_us || strcmp(p_us, tmp))
417 stat_client_write(tmp, SI_AUDIOD_UPTIME);
418 free(p_us);
419 p_us = tmp;
420
421 tmp = audiod_status_string();
422 if (!p_as || strcmp(p_as, tmp))
423 stat_client_write(tmp, SI_AUDIOD_STATUS);
424 free(p_as);
425 p_as = tmp;
426
427 tmp = decoder_flags();
428 if (!p_df || strcmp(p_df, tmp))
429 stat_client_write(tmp, SI_DECODER_FLAGS);
430 free(p_df);
431 p_df = tmp;
432 }
433
434 static void clear_slot(int slot_num)
435 {
436 struct slot_info *s = &slot[slot_num];
437
438 PARA_INFO_LOG("clearing slot %d\n", slot_num);
439 memset(s, 0, sizeof(struct slot_info));
440 s->format = -1;
441 }
442
443 static void kill_stream_writer(int slot_num)
444 {
445 struct slot_info *s = &slot[slot_num];
446
447 if (s->format < 0 || s->wkilled || s->wpid <= 0)
448 return;
449 PARA_DEBUG_LOG("kill -TERM %d (%s stream writer in slot %d)\n",
450 s->wpid, audio_formats[s->format], slot_num);
451 kill(s->wpid, SIGTERM);
452 s->wkilled = 1;
453 s->fci->error = 1;
454 }
455
456 static void set_restart_barrier(int format, struct timeval *now)
457 {
458 struct timeval tmp;
459
460 if (now)
461 tmp = *now;
462 else
463 gettimeofday(&tmp, NULL);
464 tv_add(&tmp, &restart_delay, &afi[format].restart_barrier);
465 }
466
467 static void close_receiver(int slot_num)
468 {
469 struct slot_info *s = &slot[slot_num];
470 struct audio_format_info *a;
471
472 if (s->format < 0 || !s->receiver_node)
473 return;
474 a = &afi[s->format];
475 PARA_NOTICE_LOG("closing %s recevier in slot %d\n",
476 audio_formats[s->format] , slot_num);
477 a->receiver->close(s->receiver_node);
478 free(s->receiver_node);
479 s->receiver_node = NULL;
480 set_restart_barrier(s->format, NULL);
481 }
482
483 static void kill_all_decoders(void)
484 {
485 int i;
486
487 FOR_EACH_SLOT(i)
488 if (slot[i].format >= 0) {
489 PARA_INFO_LOG("stopping decoder in slot %d\n", i);
490 kill_stream_writer(i);
491 }
492 }
493
494 static void check_sigchld(void)
495 {
496 pid_t pid;
497 int i;
498 struct timeval now;
499 gettimeofday(&now, NULL);
500
501 reap_next_child:
502 pid = para_reap_child();
503 if (pid <= 0)
504 return;
505 FOR_EACH_SLOT(i) {
506 struct slot_info *s = &slot[i];
507 long lifetime;
508 if (s->format < 0)
509 continue;
510 if (pid == s->wpid) {
511 s->wpid = -1;
512 lifetime = now.tv_sec - s->wstime.tv_sec;
513 PARA_INFO_LOG("%s stream writer in slot %d died "
514 "after %li secs\n",
515 audio_formats[s->format], i, lifetime);
516 set_restart_barrier(s->format, &now);
517 goto reap_next_child;
518 }
519 }
520 PARA_CRIT_LOG("para_client died (pid %d)\n", pid);
521 goto reap_next_child;
522 }
523
524 static int get_empty_slot(void)
525 {
526 int i;
527 struct slot_info *s;
528
529 FOR_EACH_SLOT(i) {
530 s = &slot[i];
531 if (s->format < 0) {
532 clear_slot(i);
533 return i;
534 }
535 if (s->write_fd > 0 || s->wpid > 0)
536 continue;
537 if (s->receiver_node)
538 continue;
539 if (s->fci)
540 continue;
541 clear_slot(i);
542 return i;
543 }
544 return -E_NO_MORE_SLOTS;
545 }
546
547 static int decoder_running(int format)
548 {
549 int i, ret = 0;
550 struct slot_info *s;
551
552 FOR_EACH_SLOT(i) {
553 s = &slot[i];
554 if (s->format == format && s->receiver_node)
555 ret |= 1;
556 if (s->format == format && s->wpid > 0)
557 ret |= 2;
558 }
559 return ret;
560 }
561
562 static void close_stat_pipe(void)
563 {
564 int i;
565
566 if (stat_pipe < 0)
567 return;
568 PARA_NOTICE_LOG("%s", "closing status pipe\n");
569 close(stat_pipe);
570 del_close_on_fork_list(stat_pipe);
571 stat_pipe = -1;
572 kill_all_decoders();
573 for (i = 0; i < NUM_STAT_ITEMS; i++) {
574 free(stat_item_values[i]);
575 stat_item_values[i] = NULL;
576 }
577 dump_empty_status();
578 length_seconds = 0;
579 offset_seconds = 0;
580 audiod_status_dump();
581 playing = 0;
582 stat_item_values[SI_STATUS_BAR] = make_message("%s:no connection to para_server\n",
583 status_item_list[SI_STATUS_BAR]);
584 stat_client_write(stat_item_values[SI_STATUS_BAR], SI_STATUS_BAR);
585 }
586
587 static void __noreturn clean_exit(int status, const char *msg)
588 {
589 PARA_EMERG_LOG("%s\n", msg);
590 kill_all_decoders();
591 if (socket_name)
592 unlink(socket_name);
593 if (stat_pipe >= 0)
594 close_stat_pipe();
595 exit(status);
596 }
597
598 __malloc static char *glob_cmd(char *cmd)
599 {
600 char *ret, *replacement;
601 struct timeval tmp, delay, rss; /* real stream start */
602
603 delay.tv_sec = conf.stream_delay_arg / 1000;
604 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
605 // PARA_INFO_LOG("delay: %lu:%lu\n", delay.tv_sec, delay.tv_usec);
606 if (sa_time_diff_sign < 0)
607 tv_add(&server_stream_start, &sa_time_diff, &rss);
608 else
609 tv_diff(&server_stream_start, &sa_time_diff, &rss);
610 tv_add(&rss, &delay, &tmp);
611 replacement = make_message("%lu:%lu",
612 (long unsigned)tmp.tv_sec,
613 (long unsigned)tmp.tv_usec);
614 ret = s_a_r(cmd, "STREAM_START", replacement);
615 free(replacement);
616 if (!ret)
617 goto out;
618 PARA_INFO_LOG("cmd: %s, repl: %s\n", cmd, ret);
619 out:
620 return ret;
621 }
622
623 /** get the number of filters for the given audio format */
624 int num_filters(int audio_format_num)
625 {
626 return afi[audio_format_num].num_filters;
627 }
628
629 static void open_filters(int slot_num)
630 {
631 struct slot_info *s = &slot[slot_num];
632 struct audio_format_info *a = &afi[s->format];
633 int nf = a->num_filters;
634 int i;
635
636 s->fci = para_calloc(sizeof(struct filter_chain_info));
637 INIT_LIST_HEAD(&s->fci->filters);
638 if (!nf)
639 return;
640 s->fci->inbuf = s->receiver_node->buf;
641 s->fci->in_loaded = &s->receiver_node->loaded;
642 s->fci->outbuf = s->receiver_node->buf;
643 s->fci->out_loaded = &s->receiver_node->loaded;
644 s->fci->eof = &s->receiver_node->eof;
645 for (i = 0; i < nf; i++) {
646 struct filter_node *fn = para_calloc(sizeof(struct filter_node));
647 fn->conf = a->filter_conf[i];
648 fn->fci = s->fci;
649 fn->filter = a->filters[i];
650 INIT_LIST_HEAD(&fn->callbacks);
651 list_add_tail(&fn->node, &s->fci->filters);
652 fn->filter->open(fn);
653 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
654 audio_formats[s->format], i + 1, nf,
655 fn->filter->name, slot_num);
656 s->fci->outbuf = fn->buf;
657 s->fci->out_loaded = &fn->loaded;
658 }
659 PARA_DEBUG_LOG("output buffer for filter chain %p: %p\n", s->fci,
660 s->fci->outbuf);
661 }
662
663 static struct filter_node *find_filter_node(int slot_num, int format, int filternum)
664 {
665 struct filter_node *fn;
666 int i, j;
667
668 FOR_EACH_SLOT(i) {
669 struct slot_info *s = &slot[i];
670 if (s->format < 0 || !s->fci)
671 continue;
672 if (slot_num >= 0 && slot_num != i)
673 continue;
674 if (format >= 0 && s->format != format)
675 continue;
676 if (num_filters(i) < filternum)
677 continue;
678 /* success */
679 j = 1;
680 list_for_each_entry(fn, &s->fci->filters, node)
681 if (filternum <= 0 || j++ == filternum)
682 break;
683 return fn;
684 }
685 return NULL;
686 }
687
688 static void start_stream_writer(int slot_num)
689 {
690 int ret, fds[3] = {1, -1, -1};
691 struct slot_info *s = &slot[slot_num];
692 struct audio_format_info *a = &afi[s->format];
693 char *glob = NULL;
694
695 if (a->write_cmd)
696 glob = glob_cmd(a->write_cmd);
697 if (!glob)
698 glob = para_strdup("para_write -w alsa");
699 PARA_INFO_LOG("starting stream writer: %s\n", glob);
700 open_filters(slot_num);
701 ret = para_exec_cmdline_pid(&s->wpid, glob, fds);
702 free(glob);
703 if (ret < 0) {
704 PARA_ERROR_LOG("exec failed (%d)\n", ret);
705 return;
706 }
707 s->write_fd = fds[0];
708 add_close_on_fork_list(s->write_fd);
709 /* we write to this fd in do_select, so we need non-blocking */
710 mark_fd_nonblock(s->write_fd);
711 gettimeofday(&s->wstime, NULL);
712 current_decoder = slot_num;
713 activate_inactive_grab_clients(slot_num, s->format, &s->fci->filters);
714 }
715
716 static void open_receiver(int format)
717 {
718 struct audio_format_info *a = &afi[format];
719 struct slot_info *s;
720 int ret, slot_num;
721
722 slot_num = get_empty_slot();
723 if (slot_num < 0)
724 clean_exit(EXIT_FAILURE, PARA_STRERROR(-slot_num));
725 s = &slot[slot_num];
726 s->format = format;
727 gettimeofday(&s->rtime, NULL);
728 s->wtime = s->rtime;
729 s->receiver_node = para_calloc(sizeof(struct receiver_node));
730 s->receiver_node->conf = a->receiver_conf;
731 ret = a->receiver->open(s->receiver_node);
732 if (ret < 0) {
733 PARA_ERROR_LOG("failed to open receiver (%s)\n",
734 PARA_STRERROR(-ret));
735 free(s->receiver_node);
736 s->receiver_node = NULL;
737 return;
738 }
739 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
740 audio_formats[s->format], a->receiver->name, slot_num);
741 }
742
743 static int is_frozen(int format)
744 {
745 struct timeval now;
746 struct audio_format_info *a = &afi[format];
747
748 gettimeofday(&now, NULL);
749 return (tv_diff(&now, &a->restart_barrier, NULL) > 0)? 0 : 1;
750 }
751
752 static void start_current_receiver(void)
753 {
754 int i;
755
756 if (!af_status)
757 return;
758 i = get_audio_format_num(af_status);
759 if (i < 0)
760 return;
761 if ((decoder_running(i) & 1) || is_frozen(i))
762 return;
763 open_receiver(i);
764 }
765
766 static void compute_time_diff(const struct timeval *status_time)
767 {
768 struct timeval now, tmp, diff;
769 static int count;
770 int sign;
771 const struct timeval max_deviation = {0, 500 * 1000};
772 const int time_smooth = 5;
773
774 gettimeofday(&now, NULL);
775 sign = tv_diff(status_time, &now, &diff);
776 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
777 // sign, sa_time_diff_sign);
778 if (!count) {
779 sa_time_diff_sign = sign;
780 sa_time_diff = diff;
781 count++;
782 return;
783 }
784 if (count > 5) {
785 int s = tv_diff(&diff, &sa_time_diff, &tmp);
786 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
787 PARA_WARNING_LOG("time diff jump: %lims\n",
788 s * tv2ms(&tmp));
789 }
790 count++;
791 sa_time_diff_sign = tv_convex_combination(
792 sa_time_diff_sign * time_smooth, &sa_time_diff,
793 count > 10? sign : sign * time_smooth, &diff,
794 &tmp);
795 sa_time_diff = tmp;
796 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
797 sign > 0? "+" : "-",
798 tv2ms(&diff),
799 sa_time_diff_sign ? "+" : "-",
800 tv2ms(&sa_time_diff)
801 );
802 }
803
804 static void check_stat_line(char *line)
805 {
806 int itemnum;
807 size_t ilen = 0;
808 long unsigned sec, usec;
809 char *tmp;
810
811 // PARA_INFO_LOG("line: %s\n", line);
812 if (!line)
813 return;
814 itemnum = stat_line_valid(line);
815 if (itemnum < 0) {
816 PARA_WARNING_LOG("invalid status line: %s\n", line);
817 return;
818 }
819 tmp = make_message("%s\n", line);
820 stat_client_write(tmp, itemnum);
821 free(tmp);
822 free(stat_item_values[itemnum]);
823 stat_item_values[itemnum] = para_strdup(line);
824 ilen = strlen(status_item_list[itemnum]);
825 switch (itemnum) {
826 case SI_STATUS:
827 playing = strstr(line, "playing")? 1 : 0;
828 break;
829 case SI_FORMAT:
830 free(af_status);
831 af_status = para_strdup(line + ilen + 1);
832 break;
833 case SI_OFFSET:
834 offset_seconds = atoi(line + ilen + 1);
835 break;
836 case SI_LENGTH:
837 length_seconds = atoi(line + ilen + 1);
838 break;
839 case SI_STREAM_START:
840 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
841 server_stream_start.tv_sec = sec;
842 server_stream_start.tv_usec = usec;
843 }
844 break;
845 case SI_CURRENT_TIME:
846 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
847 struct timeval tv = {sec, usec};
848 compute_time_diff(&tv);
849 }
850 break;
851 }
852 }
853
854 static void handle_signal(int sig)
855 {
856 switch (sig) {
857 case SIGCHLD:
858 return check_sigchld();
859 case SIGINT:
860 case SIGTERM:
861 case SIGHUP:
862 PARA_EMERG_LOG("terminating on signal %d\n", sig);
863 clean_exit(EXIT_FAILURE, "caught deadly signal");
864 return;
865 }
866 }
867
868 static void check_timeouts(void)
869 {
870 struct timeval now;
871 int slot_num, timeout = conf.stream_timeout_arg;
872
873 gettimeofday(&now, NULL);
874 FOR_EACH_SLOT(slot_num) {
875 struct slot_info *s = &slot[slot_num];
876 if (s->format < 0)
877 continue;
878 /* check read time */
879 if (s->receiver_node &&
880 now.tv_sec > s->rtime.tv_sec + timeout) {
881 PARA_INFO_LOG("%s input buffer (slot %d) not ready\n",
882 audio_formats[s->format], slot_num);
883 if (s->fci)
884 s->fci->error = 42;
885 else
886 close_receiver(slot_num);
887 }
888 /* check write time */
889 if (s->wpid > 0 && !s->wkilled &&
890 now.tv_sec > s->wtime.tv_sec + timeout) {
891 PARA_INFO_LOG("%s output buffer (slot %d) not ready\n",
892 audio_formats[s->format], slot_num);
893 if (s->fci)
894 s->fci->error = 42;
895 kill_stream_writer(slot_num);
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("err: %d\n", s->fci->error);
940 PARA_INFO_LOG("slot %d: closing write fd %d\n", slot_num,
941 s->write_fd);
942 close(s->write_fd);
943 del_close_on_fork_list(s->write_fd);
944 s->write_fd = -1;
945 }
946 if (s->wpid > 0)
947 return; /* wait until writer dies before closing filters */
948 PARA_INFO_LOG("closing all filters in slot %d (filter_chain %p)\n",
949 slot_num, s->fci);
950 close_filters(s->fci);
951 free(s->fci);
952 close_receiver(slot_num);
953 clear_slot(slot_num);
954 }
955
956 static void set_stream_fds(fd_set *wfds, int *max_fileno)
957 {
958 int i;
959
960 check_timeouts();
961 FOR_EACH_SLOT(i) {
962 struct slot_info *s = &slot[i];
963 struct audio_format_info *a;
964 struct receiver_node *rn;
965
966 close_decoder_if_idle(i);
967 s->wcheck = 0;
968 if (s->format < 0)
969 continue;
970 a = &afi[s->format];
971 rn = s->receiver_node;
972 if (rn && rn->loaded && !s->wpid) {
973 PARA_INFO_LOG("no writer in slot %d\n", i);
974 start_stream_writer(i);
975 }
976 if (s->write_fd <= 0)
977 continue;
978 if (!get_loaded_bytes(i))
979 continue;
980 para_fd_set(s->write_fd, wfds, max_fileno);
981 s->wcheck = 1;
982 }
983 }
984
985 static int write_audio_data(int slot_num)
986 {
987 struct slot_info *s = &slot[slot_num];
988 struct audio_format_info *a = &afi[s->format];
989 struct receiver_node *rn = s->receiver_node;
990 int rv;
991 char **buf;
992 size_t *len;
993
994 if (a->num_filters) {
995 buf = &s->fci->outbuf;
996 len = s->fci->out_loaded;
997 } else {
998 buf = &rn->buf;
999 len = &rn->loaded;
1000 }
1001 PARA_DEBUG_LOG("writing %p (%zd bytes)\n", *buf, *len);
1002 rv = write(s->write_fd, *buf, *len);
1003 PARA_DEBUG_LOG("wrote %d/%zd\n", rv, *len);
1004 if (rv < 0) {
1005 PARA_WARNING_LOG("write error in slot %d (fd %d): %s\n",
1006 slot_num, s->write_fd, strerror(errno));
1007 *len = 0;
1008 s->fci->error = E_WRITE_AUDIO_DATA;
1009 } else if (rv != *len) {
1010 PARA_DEBUG_LOG("partial %s write (%i/%zd) for slot %d\n",
1011 audio_formats[s->format], rv, *len, slot_num);
1012 *len -= rv;
1013 memmove(*buf, *buf + rv, *len);
1014 } else
1015 *len = 0;
1016 if (rv > 0)
1017 gettimeofday(&s->wtime, NULL);
1018 return rv;
1019 }
1020
1021 static void slot_io(fd_set *wfds)
1022 {
1023 int ret, i;
1024
1025 FOR_EACH_SLOT(i) {
1026 struct slot_info *s = &slot[i];
1027 struct receiver_node *rn = s->receiver_node;
1028
1029 if (rn && rn->loaded)
1030 gettimeofday(&s->rtime, NULL);
1031 if (s->format >= 0 && s->write_fd > 0 && s->fci) {
1032 ret = filter_io(s->fci);
1033 if (ret < 0)
1034 s->fci->error = -ret;
1035 // PARA_DEBUG_LOG("slot %d, filter io %d bytes, check write: %d, loaded: %d/%d, eof: %d\n",
1036 // i, ret, s->wcheck, rn->loaded, *s->fci->out_loaded, rn->eof);
1037 }
1038 if (s->write_fd <= 0 || !s->wcheck || !FD_ISSET(s->write_fd, wfds))
1039 continue;
1040 write_audio_data(i);
1041 }
1042 }
1043
1044 static int parse_stream_command(const char *txt, char **cmd)
1045 {
1046 char *p = strchr(txt, ':');
1047 int i;
1048
1049 if (!p)
1050 return -E_MISSING_COLON;
1051 p++;
1052 FOR_EACH_AUDIO_FORMAT(i) {
1053 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
1054 continue;
1055 *cmd = p;
1056 return i;
1057 }
1058 return -E_UNSUPPORTED_AUDIO_FORMAT;
1059 }
1060
1061 static int add_filter(int format, char *cmdline)
1062 {
1063 struct audio_format_info *a = &afi[format];
1064 int filter_num, nf = a->num_filters;
1065
1066 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
1067 if (filter_num < 0)
1068 return filter_num;
1069 a->filters[nf] = &filters[filter_num];
1070 a->num_filters++;
1071 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf + 1,
1072 a->filters[nf]->name);
1073 return filter_num;
1074 }
1075
1076 static int setup_default_filters(void)
1077 {
1078 int i, ret = 1;
1079
1080 FOR_EACH_AUDIO_FORMAT(i) {
1081 struct audio_format_info *a = &afi[i];
1082 char *tmp;
1083 int j;
1084 if (a->num_filters)
1085 continue;
1086 /* add "dec" to audio format name */
1087 tmp = make_message("%sdec", audio_formats[i]);
1088 for (j = 0; filters[j].name; j++)
1089 if (!strcmp(tmp, filters[j].name))
1090 break;
1091 free(tmp);
1092 ret = -E_UNSUPPORTED_FILTER;
1093 if (!filters[j].name)
1094 goto out;
1095 tmp = para_strdup(filters[j].name);
1096 ret = add_filter(i, tmp);
1097 free(tmp);
1098 if (ret < 0)
1099 goto out;
1100 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
1101 filters[j].name);
1102 ret = add_filter(i, "wav");
1103 if (ret < 0)
1104 goto out;
1105 PARA_INFO_LOG("%s -> default filter: wav\n", audio_formats[i]);
1106 }
1107 out:
1108 return ret;
1109 }
1110
1111 static int init_stream_io(void)
1112 {
1113 int i, ret, receiver_num, nf;
1114 char *cmd;
1115
1116 for (i = 0; i < conf.stream_write_cmd_given; i++) {
1117 ret = parse_stream_command(conf.stream_write_cmd_arg[i], &cmd);
1118 if (ret < 0)
1119 goto out;
1120 afi[ret].write_cmd = para_strdup(cmd);
1121 PARA_INFO_LOG("%s write command: %s\n", audio_formats[ret], afi[ret].write_cmd);
1122 }
1123 for (i = 0; receivers[i].name; i++) {
1124 PARA_INFO_LOG("initializing %s receiver\n", receivers[i].name);
1125 receivers[i].init(&receivers[i]);
1126 }
1127 for (i = 0; i < conf.receiver_given; i++) {
1128 char *arg = conf.receiver_arg[i];
1129 char *recv = strchr(arg, ':');
1130 ret = -E_MISSING_COLON;
1131 if (!recv)
1132 goto out;
1133 *recv = '\0';
1134 recv++;
1135 ret = get_audio_format_num(arg);
1136 if (ret < 0)
1137 goto out;
1138 afi[ret].receiver_conf = check_receiver_arg(recv, &receiver_num);
1139 if (!afi[ret].receiver_conf) {
1140 ret = -E_RECV_SYNTAX;
1141 goto out;
1142 }
1143 afi[ret].receiver = &receivers[receiver_num];
1144 }
1145 /* use the first available receiver with no arguments
1146 * for those audio formats for which no receiver
1147 * was specified
1148 */
1149 cmd = para_strdup(receivers[0].name);
1150 FOR_EACH_AUDIO_FORMAT(i) {
1151 struct audio_format_info *a = &afi[i];
1152 if (a->receiver_conf)
1153 continue;
1154 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
1155 if (!a->receiver_conf)
1156 return -E_RECV_SYNTAX;
1157 a->receiver = &receivers[receiver_num];
1158 }
1159 free(cmd);
1160 /* filters */
1161 filter_init(filters);
1162 nf = PARA_MAX(2, conf.filter_given) + 1;
1163 PARA_INFO_LOG("allocating space for %d filters\n", nf);
1164 FOR_EACH_AUDIO_FORMAT(i) {
1165 afi[i].filter_conf = para_malloc(nf * sizeof(char *));
1166 afi[i].filters = para_malloc(nf * sizeof(struct filter *));
1167 }
1168 if (!conf.no_default_filters_given)
1169 return setup_default_filters();
1170 for (i = 0; i < conf.filter_given; i++) {
1171 char *arg = conf.filter_arg[i];
1172 char *filter_name = strchr(arg, ':');
1173 ret = -E_MISSING_COLON;
1174 if (!filter_name)
1175 goto out;
1176 *filter_name = '\0';
1177 filter_name++;
1178 ret = get_audio_format_num(arg);
1179 if (ret < 0)
1180 goto out;
1181 ret = add_filter(ret, filter_name);
1182 if (ret < 0)
1183 goto out;
1184 }
1185 ret = 1;
1186 out:
1187 return ret;
1188 }
1189
1190 static int dump_commands(int fd)
1191 {
1192 char *buf = para_strdup(""), *tmp = NULL;
1193 int i;
1194 ssize_t ret;
1195
1196 FOR_EACH_COMMAND(i) {
1197 tmp = make_message("%s%s\t%s\n", buf, cmds[i].name,
1198 cmds[i].description);
1199 free(buf);
1200 buf = tmp;
1201 }
1202 ret = client_write(fd, buf);
1203 free(buf);
1204 return ret;
1205 }
1206
1207 /*
1208 * command handlers don't close their fd on errors (ret < 0) so that
1209 * its caller can send an error message. Otherwise (ret >= 0) it's up
1210 * to each individual command to close the fd if necessary.
1211 */
1212
1213 static int com_help(int fd, int argc, char **argv)
1214 {
1215 int i, ret;
1216 char *buf;
1217 const char *dflt = "No such command. Available commands:\n";
1218
1219 if (argc < 2) {
1220 ret = dump_commands(fd);
1221 goto out;
1222 }
1223 FOR_EACH_COMMAND(i) {
1224 if (strcmp(cmds[i].name, argv[1]))
1225 continue;
1226 buf = make_message(
1227 "NAME\n\t%s -- %s\n"
1228 "SYNOPSIS\n\tpara_audioc %s\n"
1229 "DESCRIPTION\n%s\n",
1230 argv[1],
1231 cmds[i].description,
1232 cmds[i].synopsis,
1233 cmds[i].help
1234 );
1235 ret = client_write(fd, buf);
1236 free(buf);
1237 goto out;
1238 }
1239 ret = client_write(fd, dflt);
1240 if (ret > 0)
1241 ret = dump_commands(fd);
1242 out:
1243 if (ret >= 0)
1244 close(fd);
1245 return ret;
1246 }
1247
1248 static int com_stat(int fd, __a_unused int argc, __a_unused char **argv)
1249 {
1250 int i, ret;
1251 char *buf = NULL;
1252 long unsigned mask = ~0LU;
1253
1254 if (argc > 1) {
1255 mask = 0;
1256 for (i = 1; i < argc; i++) {
1257 ret = stat_item_valid(argv[i]);
1258 if (ret < 0)
1259 return ret;
1260 mask |= (1 << ret);
1261 }
1262 }
1263 PARA_INFO_LOG("mask: 0x%lx\n", mask);
1264 if (mask & (1 << SI_PLAY_TIME)) {
1265 struct timeval *t = wstime();
1266 char *ts = get_time_string(t);
1267 if (ts) {
1268 ret = client_write(fd, ts);
1269 if (ret < 0)
1270 goto out;
1271 free(ts);
1272 }
1273 }
1274 if (mask & (1 << SI_AUDIOD_UPTIME)) {
1275 char *tmp, *us = uptime_str();
1276 tmp = make_message("%s:%s\n",
1277 status_item_list[SI_AUDIOD_UPTIME], us);
1278 free(us);
1279 ret = client_write(fd, tmp);
1280 if (ret < 0)
1281 goto out;
1282 free(tmp);
1283 }
1284 if (mask & (1 << SI_AUDIOD_STATUS)) {
1285 char *s = audiod_status_string();
1286 ret = client_write(fd, s);
1287 if (ret < 0)
1288 goto out;
1289 free(s);
1290 }
1291 if (mask & (1 << SI_DECODER_FLAGS)) {
1292 char *df =decoder_flags();
1293 ret = client_write(fd, df);
1294 if (ret < 0)
1295 goto out;
1296 free(df);
1297 }
1298
1299 for (i = 0; i < NUM_STAT_ITEMS; i++) {
1300 char *tmp, *v;
1301 if (!((1 << i) & mask))
1302 continue;
1303 v = stat_item_values[i];
1304 tmp = make_message("%s%s%s", buf? buf: "",
1305 v? v : "", v? "\n" : "");
1306 free(buf);
1307 buf = tmp;
1308 }
1309 ret = client_write(fd, buf);
1310 out:
1311 if (ret > 0)
1312 ret = stat_client_add(fd, mask);
1313 free(buf);
1314 return ret;
1315 }
1316
1317 #if 0
1318 static char *list_filters(void)
1319 {
1320 int i, j;
1321 char *tmp, *msg = make_message("format\tnum\tcmd\n");
1322
1323 FOR_EACH_AUDIO_FORMAT(i) {
1324 for (j = 0; j < afi[i].num_filters; j++) {
1325 tmp = make_message("%s\t%i\t%s\n",
1326 afi[i].name, j, afi[i].filter_cmds[j]);
1327 msg = para_strcat(msg, tmp);
1328 free(tmp);
1329 }
1330 tmp = make_message("%s\t%i\t%s\n", afi[i].name,
1331 j, afi[i].write_cmd);
1332 msg = para_strcat(msg, tmp);
1333 free(tmp);
1334 }
1335 return msg;
1336 }
1337 #endif
1338
1339
1340 static int com_grab(int fd, char *cmdline)
1341 {
1342 struct grab_client *gc;
1343 struct filter_node *fn;
1344 int i, err;
1345 char *msg;
1346
1347 gc = grab_client_new(fd, cmdline, &err);
1348 if (!gc)
1349 goto err_out;
1350 fn = find_filter_node(gc->conf->slot_arg, gc->audio_format_num, gc->conf->filter_num_arg);
1351 if (fn)
1352 activate_grab_client(gc, fn);
1353 return 1;
1354 err_out:
1355 if (err != -E_GC_HELP_GIVEN && err != -E_GC_VERSION_GIVEN)
1356 return err;
1357 if (err == -E_GC_HELP_GIVEN) {
1358 msg = make_message("%s\n\n", grab_client_args_info_usage);
1359 for (i = 0; grab_client_args_info_help[i]; i++) {
1360 char *tmp = make_message("%s%s\n", msg,
1361 grab_client_args_info_help[i]);
1362 free(msg);
1363 msg = tmp;
1364 }
1365 } else
1366 msg = make_message("%s %s\n",
1367 GRAB_CLIENT_CMDLINE_PARSER_PACKAGE,
1368 GRAB_CLIENT_CMDLINE_PARSER_VERSION);
1369 err = client_write(fd, msg);
1370 free(msg);
1371 if (err < 0)
1372 return err;
1373 close(fd);
1374 return 1;
1375 }
1376
1377 static int __noreturn com_term(int fd, __a_unused int argc, __a_unused char **argv)
1378 {
1379 close(fd);
1380 clean_exit(EXIT_SUCCESS, "terminating on user request");
1381 }
1382
1383 static int com_on(int fd, __a_unused int argc, __a_unused char **argv)
1384 {
1385 audiod_status = AUDIOD_ON;
1386 close(fd);
1387 return 1;
1388 }
1389
1390 static int com_off(int fd, __a_unused int argc, __a_unused char **argv)
1391 {
1392 audiod_status = AUDIOD_OFF;
1393 close(fd);
1394 return 1;
1395 }
1396
1397 static int com_sb(int fd, __a_unused int argc, __a_unused char **argv)
1398 {
1399 audiod_status = AUDIOD_STANDBY;
1400 close(fd);
1401 return 1;
1402 }
1403
1404 static int com_cycle(int fd, int argc, char **argv)
1405 {
1406 switch (audiod_status) {
1407 case AUDIOD_ON:
1408 return com_sb(fd, argc, argv);
1409 break;
1410 case AUDIOD_OFF:
1411 return com_on(fd, argc, argv);
1412 break;
1413 case AUDIOD_STANDBY:
1414 return com_off(fd, argc, argv);
1415 break;
1416 }
1417 close(fd);
1418 return 1;
1419 }
1420
1421 static int check_perms(uid_t uid)
1422 {
1423 int i;
1424
1425 if (!conf.user_allow_given)
1426 return 1;
1427 for (i = 0; i < conf.user_allow_given; i++)
1428 if (uid == conf.user_allow_arg[i])
1429 return 1;
1430 return -E_UCRED_PERM;
1431 }
1432
1433 static int handle_connect(void)
1434 {
1435 int i, argc, ret, clifd = -1;
1436 char *cmd = NULL, *p, *buf = para_calloc(MAXLINE), **argv = NULL;
1437 struct sockaddr_un unix_addr;
1438
1439 ret = para_accept(audiod_socket, &unix_addr, sizeof(struct sockaddr_un));
1440 if (ret < 0)
1441 goto out;
1442 clifd = ret;
1443 ret = recv_cred_buffer(clifd, buf, MAXLINE - 1);
1444 if (ret < 0)
1445 goto out;
1446 PARA_INFO_LOG("connection from user %i, buf: %s\n", ret, buf);
1447 ret = check_perms(ret);
1448 if (ret < 0)
1449 goto out;
1450 ret = -E_INVALID_AUDIOD_CMD;
1451 cmd = para_strdup(buf);
1452 p = strchr(cmd, '\n');
1453 if (!p)
1454 p = "";
1455 else {
1456 *p = '\0';
1457 p++;
1458 }
1459 for (i = 0; cmds[i].name; i++) {
1460 int j;
1461 if (strcmp(cmds[i].name, cmd))
1462 continue;
1463 if (cmds[i].handler) {
1464 argc = split_args(buf, &argv, "\n");
1465 PARA_INFO_LOG("argv[0]: %s, argc= %d\n", argv[0], argc);
1466 ret = cmds[i].handler(clifd, argc, argv);
1467 goto out;
1468 }
1469 for (j = 0; p[j]; j++)
1470 if (p[j] == '\n')
1471 p[j] = ' ';
1472 PARA_INFO_LOG("cmd: %s, options: %s\n", cmd, p);
1473 ret = cmds[i].line_handler(clifd, p);
1474 goto out;
1475 }
1476 ret = -E_INVALID_AUDIOD_CMD; /* cmd not found */
1477 out:
1478 free(cmd);
1479 free(buf);
1480 free(argv);
1481 if (clifd > 0 && ret < 0 && ret != -E_CLIENT_WRITE) {
1482 char *tmp = make_message("%s\n", PARA_STRERROR(-ret));
1483 client_write(clifd, tmp);
1484 free(tmp);
1485 close(clifd);
1486 }
1487 return ret;
1488 }
1489
1490 static void audiod_get_socket(void)
1491 {
1492 struct sockaddr_un unix_addr;
1493
1494 if (conf.socket_given)
1495 socket_name = para_strdup(conf.socket_arg);
1496 else {
1497 char *hn = para_hostname();
1498 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1499 hn);
1500 free(hn);
1501 }
1502 PARA_NOTICE_LOG("connecting to local socket %s\n", socket_name);
1503 if (conf.force_given)
1504 unlink(socket_name);
1505 audiod_socket = create_pf_socket(socket_name, &unix_addr,
1506 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
1507 if (audiod_socket < 0) {
1508 PARA_EMERG_LOG("%s", "can not connect to socket\n");
1509 exit(EXIT_FAILURE); /* do not unlink socket */
1510 }
1511 if (listen(audiod_socket, 5) < 0) {
1512 PARA_EMERG_LOG("%s", "can not listen on socket\n");
1513 exit(EXIT_FAILURE); /* do not unlink socket */
1514 }
1515 add_close_on_fork_list(audiod_socket);
1516 }
1517
1518 static int open_stat_pipe(void)
1519 {
1520 int ret, fd[3] = {-1, 1, 0};
1521 pid_t pid;
1522 ret = para_exec_cmdline_pid(&pid, BINDIR "/para_client stat", fd);
1523 if (ret >= 0) {
1524 ret = fd[1];
1525 PARA_NOTICE_LOG("stat pipe opened, fd %d\n", ret);
1526 add_close_on_fork_list(ret);
1527 } else
1528 clean_exit(EXIT_FAILURE, "failed to open status pipe");
1529 return ret;
1530 }
1531
1532 static void audiod_pre_select(fd_set *rfds, fd_set *wfds, struct timeval *tv,
1533 int *max_fileno)
1534 {
1535 int i, ret;
1536
1537 FOR_EACH_SLOT(i) {
1538 struct slot_info *s = &slot[i];
1539 struct audio_format_info *a;
1540 struct receiver_node *rn = s->receiver_node;
1541 if (s->format < 0 || !rn)
1542 continue;
1543 a = &afi[s->format];
1544 ret = a->receiver->pre_select(rn, rfds, wfds, tv);
1545 // PARA_NOTICE_LOG("%s preselect: %d\n", a->receiver->name, ret);
1546 *max_fileno = PARA_MAX(*max_fileno, ret);
1547 }
1548 }
1549 static void audiod_post_select(int select_ret, fd_set *rfds, fd_set *wfds)
1550 {
1551 int i, ret;
1552
1553 FOR_EACH_SLOT(i) {
1554 struct slot_info *s = &slot[i];
1555 struct audio_format_info *a;
1556 struct receiver_node *rn = s->receiver_node;
1557 if (s->format < 0 || !rn || rn->eof)
1558 continue;
1559 a = &afi[s->format];
1560 ret = a->receiver->post_select(rn, select_ret, rfds, wfds);
1561 if (ret <= 0) {
1562 if (ret)
1563 PARA_ERROR_LOG("%s post select failed: %s (slot %d)\n",
1564 a->receiver->name, PARA_STRERROR(-ret), i);
1565 else
1566 PARA_INFO_LOG("eof in slot %d\n", i);
1567 rn->eof = 1;
1568 }
1569 if (ret < 0 && s->fci)
1570 s->fci->error = ret;
1571 }
1572 }
1573
1574 /* TODO: move everything before the select call to pre_select() */
1575 static void __noreturn audiod_mainloop(void)
1576 {
1577 fd_set rfds, wfds;
1578 int ret, max_fileno, sbo = 0;
1579 char status_buf[STRINGSIZE] = "";
1580 struct timeval tv;
1581 repeat:
1582 FD_ZERO(&wfds);
1583 FD_ZERO(&rfds);
1584 max_fileno = -1;
1585 /* always check signal pipe and the local socket */
1586 para_fd_set(signal_pipe, &rfds, &max_fileno);
1587 para_fd_set(audiod_socket, &rfds, &max_fileno);
1588
1589 if (audiod_status != AUDIOD_ON)
1590 kill_all_decoders();
1591 else if (playing)
1592 start_current_receiver();
1593
1594 set_stream_fds(&wfds, &max_fileno);
1595 /* status pipe */
1596 if (stat_pipe >= 0 && audiod_status == AUDIOD_OFF)
1597 close_stat_pipe();
1598 if (stat_pipe < 0 && audiod_status != AUDIOD_OFF) {
1599 stat_pipe = open_stat_pipe();
1600 sbo = 0;
1601 status_buf[0] = '\0';
1602 }
1603 if (stat_pipe >= 0 && audiod_status != AUDIOD_OFF)
1604 para_fd_set(stat_pipe, &rfds, &max_fileno);
1605 /* local socket */
1606 tv.tv_sec = 0;
1607 tv.tv_usec = 200 * 1000;
1608 audiod_pre_select(&rfds, &wfds, &tv, &max_fileno);
1609 ret = para_select(max_fileno + 1, &rfds, &wfds, &tv);
1610 if (ret < 0)
1611 goto repeat;
1612 if (audiod_status != AUDIOD_OFF)
1613 audiod_status_dump();
1614 audiod_post_select(ret, &rfds, &wfds);
1615 /* read status pipe */
1616 if (stat_pipe >=0 && FD_ISSET(stat_pipe, &rfds)) {
1617 ret = read(stat_pipe, status_buf + sbo, STRINGSIZE - 1 - sbo);
1618 if (ret <= 0) {
1619 close_stat_pipe();
1620 /* avoid busy loop if server is down */
1621 while (sleep(1) > 0)
1622 ; /* try again*/
1623 } else {
1624 status_buf[ret + sbo] = '\0';
1625 sbo = for_each_line(status_buf, ret + sbo,
1626 &check_stat_line);
1627 }
1628 }
1629 slot_io(&wfds);
1630 if (FD_ISSET(audiod_socket, &rfds)) {
1631 ret = handle_connect();
1632 if (ret < 0) {
1633 PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
1634 }
1635 }
1636 /* signals */
1637 if (FD_ISSET(signal_pipe, &rfds)) {
1638 int sig_nr = para_next_signal();
1639 if (sig_nr > 0)
1640 handle_signal(sig_nr);
1641 }
1642 goto repeat;
1643 }
1644
1645 static void set_initial_status(void)
1646 {
1647 audiod_status = AUDIOD_ON;
1648 if (!conf.mode_given)
1649 return;
1650 if (!strcmp(conf.mode_arg, "sb")) {
1651 audiod_status = AUDIOD_STANDBY;
1652 return;
1653 }
1654 if (!strcmp(conf.mode_arg, "off")) {
1655 audiod_status = AUDIOD_OFF;
1656 return;
1657 }
1658 if (strcmp(conf.mode_arg, "on"))
1659 PARA_WARNING_LOG("%s", "invalid mode\n");
1660 }
1661
1662 int __noreturn main(int argc, char *argv[])
1663 {
1664 char *cf;
1665 int i;
1666
1667 valid_fd_012();
1668 hostname = para_hostname();
1669 cmdline_parser(argc, argv, &conf);
1670 para_drop_privileges(conf.user_arg, conf.group_arg);
1671 cf = configfile_exists();
1672 if (cf) {
1673 if (cmdline_parser_configfile(cf, &conf, 0, 0, 0)) {
1674 PARA_EMERG_LOG("%s", "parse error in config file\n");
1675 exit(EXIT_FAILURE);
1676 }
1677 }
1678 if (conf.logfile_given)
1679 logfile = open_log(conf.logfile_arg);
1680 log_welcome("para_audiod", conf.loglevel_arg);
1681 i = init_stream_io();
1682 if (i < 0) {
1683 PARA_EMERG_LOG("init stream io error: %s\n", PARA_STRERROR(-i));
1684 exit(EXIT_FAILURE);
1685 }
1686 server_uptime(UPTIME_SET);
1687 set_initial_status();
1688 FOR_EACH_SLOT(i)
1689 clear_slot(i);
1690 init_grabbing();
1691 setup_signal_handling();
1692 if (conf.daemon_given)
1693 daemon_init();
1694 audiod_get_socket(); /* doesn't return on errors */
1695 audiod_mainloop();
1696 }