audiod: Improve receiver restart logic.
[paraslash.git] / audiod.c
1 /*
2 * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file audiod.c the paraslash's audio daemon */
8 #include <sys/types.h>
9 #include <dirent.h>
10 #include <signal.h>
11
12 #include "para.h"
13 #include "error.h"
14 #include "audiod.cmdline.h"
15 #include "list.h"
16 #include "sched.h"
17 #include "ggo.h"
18 #include "recv.h"
19 #include "filter.h"
20 #include "grab_client.cmdline.h"
21 #include "grab_client.h"
22 #include "client.cmdline.h"
23 #include "client.h"
24 #include "audiod.h"
25 #include "net.h"
26 #include "daemon.h"
27 #include "string.h"
28 #include "fd.h"
29 #include "write.h"
30 #include "write_common.h"
31 #include "signal.h"
32
33 /** define the array of error lists needed by para_audiod */
34 INIT_AUDIOD_ERRLISTS;
35 /** define the array containing all supported audio formats */
36 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
37
38 /** Defines how audiod handles one supported audio format. */
39 struct audio_format_info {
40 /** pointer to the receiver for this audio format */
41 struct receiver *receiver;
42 /** the receiver configuration */
43 void *receiver_conf;
44 /** the number of filters that should be activated for this audio format */
45 unsigned int num_filters;
46 /** Array of filter numbers to be activated. */
47 unsigned *filter_nums;
48 /** Pointer to the array of filter configurations. */
49 void **filter_conf;
50 /** the number of filters that should be activated for this audio format */
51 unsigned int num_writers;
52 /** pointer to the array of writers to be activated */
53 struct writer **writers;
54 /** pointer to the array of writer configurations */
55 void **writer_conf;
56 /** do not start receiver/filters/writer before this time */
57 struct timeval restart_barrier;
58 };
59
60 /**
61 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
62 * be associated with a receiver/filter/writer triple. This array holds all
63 * information on the status of these slots.
64 *
65 * \sa struct slot_info
66 * */
67 struct slot_info slot[MAX_STREAM_SLOTS];
68
69 /** The vss status flags audiod is interested in. */
70 enum vss_status_flags {
71 /** Whether the 'N' flag is set. */
72 VSS_STATUS_FLAG_NEXT = 1,
73 /** The 'P' flag is set. */
74 VSS_STATUS_FLAG_PLAYING = 2,
75 };
76
77 /**
78 * The task for obtaining para_server's status (para_client stat).
79 *
80 * \sa struct task, struct sched.
81 */
82 struct status_task {
83 /** The associated task structure of audiod. */
84 struct task task;
85 /** Client data associated with the stat task. */
86 struct client_task *ct;
87 /** Do not restart client command until this time. */
88 struct timeval restart_barrier;
89 /** Last time we received status data from para_server. */
90 struct timeval last_status_read;
91 /** The offset value announced by para_server. */
92 int offset_seconds;
93 /** The length of the current audio file as announced by para_server. */
94 int length_seconds;
95 /** The start of the current stream from the view of para_server. */
96 struct timeval server_stream_start;
97 /** The average time deviation between para_server and para_audiod. */
98 struct timeval sa_time_diff;
99 /** Whether client time is ahead of server time. */
100 int sa_time_diff_sign;
101 /** The 'P' and the 'N' flags as announced by para_server. */
102 enum vss_status_flags vss_status;
103 /** Number of times the clock difference is to be checked. */
104 unsigned clock_diff_count;
105 /** When to start the next check for clock difference. */
106 struct timeval clock_diff_barrier;
107 /** Number of the audio format as announced by para_server. */
108 int current_audio_format_num;
109 };
110
111 /** The array of status items sent by para_server. */
112 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
113
114 /**
115 * the current mode of operation of which can be changed by the on/off/cycle
116 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
117 */
118 int audiod_status = AUDIOD_ON;
119
120 /**
121 * the gengetopt args_info struct that holds information on all command line
122 * arguments
123 */
124 struct audiod_args_info conf;
125
126 static char *socket_name;
127 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
128
129 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
130
131 static struct status_task status_task_struct;
132
133 /**
134 * the task that calls the status command of para_server
135 *
136 * \sa struct status_task
137 */
138 static struct status_task *stat_task = &status_task_struct;
139 static struct timeval initial_delay_barrier;
140
141 /**
142 * the task for handling audiod commands
143 *
144 * \sa struct task, struct sched
145 */
146 struct command_task {
147 /** the local listening socket */
148 int fd;
149 /** the associated task structure */
150 struct task task;
151 };
152
153 /** iterate over all supported audio formats */
154 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
155
156 /**
157 * get the audio format number
158 * \param name the name of the audio format
159 *
160 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
161 * \a name is not a supported audio format.
162 */
163 int get_audio_format_num(char *name)
164 {
165 int i;
166
167 while (para_isspace(*name))
168 name++;
169 FOR_EACH_AUDIO_FORMAT(i)
170 if (!strcmp(name, audio_formats[i]))
171 return i;
172 return -E_UNSUPPORTED_AUDIO_FORMAT;
173 }
174
175 char *get_time_string(struct timeval *newest_stime)
176 {
177 struct timeval diff, adj_stream_start, tmp;
178 int total = 0, use_server_time = 1,
179 length_seconds = stat_task->length_seconds;
180
181 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
182 if (length_seconds)
183 return NULL;
184 return make_message("%s:\n", status_item_list[SI_PLAY_TIME]);
185 }
186 if (audiod_status == AUDIOD_OFF)
187 goto out;
188 if (stat_task->sa_time_diff_sign > 0)
189 tv_diff(&stat_task->server_stream_start, &stat_task->sa_time_diff,
190 &adj_stream_start);
191 else
192 tv_add(&stat_task->server_stream_start, &stat_task->sa_time_diff,
193 &adj_stream_start);
194 tmp = adj_stream_start;
195 if (newest_stime && audiod_status == AUDIOD_ON) {
196 tv_diff(newest_stime, &adj_stream_start, &diff);
197 if (tv2ms(&diff) < 5000) {
198 tmp = *newest_stime;
199 use_server_time = 0;
200 }
201 }
202 tv_diff(now, &tmp, &diff);
203 total = diff.tv_sec + stat_task->offset_seconds;
204 if (total > length_seconds)
205 total = length_seconds;
206 if (total < 0)
207 total = 0;
208 out:
209 return make_message(
210 "%s: %s%d:%02d [%d:%02d] (%d%%/%d:%02d)\n",
211 status_item_list[SI_PLAY_TIME],
212 use_server_time? "~" : "",
213 total / 60,
214 total % 60,
215 (length_seconds - total) / 60,
216 (length_seconds - total) % 60,
217 length_seconds? (total * 100 + length_seconds / 2) /
218 length_seconds : 0,
219 length_seconds / 60,
220 length_seconds % 60
221 );
222 }
223
224 static int want_colors(void)
225 {
226 if (conf.color_arg == color_arg_no)
227 return 0;
228 if (conf.color_arg == color_arg_yes)
229 return 1;
230 if (conf.logfile_given)
231 return 0;
232 return isatty(STDERR_FILENO);
233 }
234
235 static void parse_config_or_die(void)
236 {
237 int ret;
238 char *config_file;
239 struct audiod_cmdline_parser_params params = {
240 .override = 0,
241 .initialize = 0,
242 .check_required = 1,
243 .check_ambiguity = 0,
244 .print_errors = 1
245 };
246
247 if (conf.config_file_given)
248 config_file = para_strdup(conf.config_file_arg);
249 else {
250 char *home = para_homedir();
251 config_file = make_message("%s/.paraslash/audiod.conf", home);
252 free(home);
253 }
254 ret = file_exists(config_file);
255 if (conf.config_file_given && !ret) {
256 PARA_EMERG_LOG("can not read config file %s\n", config_file);
257 goto err;
258 }
259 if (ret)
260 audiod_cmdline_parser_config_file(config_file, &conf, &params);
261 free(config_file);
262 daemon_set_loglevel(conf.loglevel_arg);
263 return;
264 err:
265 free(config_file);
266 exit(EXIT_FAILURE);
267 }
268
269 static void setup_signal_handling(void)
270 {
271 sig_task->fd = para_signal_init();
272 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
273 para_install_sighandler(SIGINT);
274 para_install_sighandler(SIGTERM);
275 para_install_sighandler(SIGHUP);
276 signal(SIGPIPE, SIG_IGN);
277 }
278
279 static void clear_slot(int slot_num)
280 {
281 struct slot_info *s = &slot[slot_num];
282
283 PARA_INFO_LOG("clearing slot %d\n", slot_num);
284 memset(s, 0, sizeof(struct slot_info));
285 s->format = -1;
286 }
287
288 static void close_receiver(int slot_num)
289 {
290 struct slot_info *s = &slot[slot_num];
291 struct audio_format_info *a;
292
293 if (s->format < 0 || !s->receiver_node)
294 return;
295 a = &afi[s->format];
296 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
297 audio_formats[s->format], slot_num);
298 a->receiver->close(s->receiver_node);
299 free(s->receiver_node);
300 s->receiver_node = NULL;
301 }
302
303 static void kill_all_decoders(int error)
304 {
305 int i;
306
307 FOR_EACH_SLOT(i) {
308 struct slot_info *s = &slot[i];
309 if (s->wng && s->wng->task.error >= 0) {
310 PARA_INFO_LOG("deactivating wng in slot %d\n",
311 i);
312 s->wng->task.error = error;
313 }
314 if (s->fc && s->fc->task.error >= 0) {
315 PARA_INFO_LOG("deactivatimg filter chain in slot %d\n", i);
316 s->fc->task.error = error;
317 }
318 if (s->receiver_node && s->receiver_node->task.error >= 0) {
319 PARA_INFO_LOG("deactivating receiver_node in slot %d\n", i);
320 s->receiver_node->task.error = error;
321 }
322 }
323 }
324
325 static int get_empty_slot(void)
326 {
327 int i;
328 struct slot_info *s;
329
330 FOR_EACH_SLOT(i) {
331 s = &slot[i];
332 if (s->format < 0) {
333 clear_slot(i);
334 return i;
335 }
336 if (s->wng || s->receiver_node || s->fc)
337 continue;
338 clear_slot(i);
339 return i;
340 }
341 return -E_NO_MORE_SLOTS;
342 }
343
344 /**
345 * get the number of filters
346 *
347 * \param audio_format_num the number identifying the audio format
348 *
349 * \return the number of filters for the given audio format
350 *
351 * \sa struct filter;
352 */
353 int num_filters(int audio_format_num)
354 {
355 return afi[audio_format_num].num_filters;
356 }
357
358 static void open_filters(int slot_num)
359 {
360 struct slot_info *s = &slot[slot_num];
361 struct audio_format_info *a = &afi[s->format];
362 struct filter_node *fn;
363 int nf = a->num_filters;
364 int i;
365
366 s->fc = NULL;
367 if (!nf)
368 return;
369 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
370 s->fc = para_calloc(sizeof(struct filter_chain));
371 s->fc->filter_nodes = para_malloc(nf * sizeof(struct filter_node));
372 s->fc->inbuf = s->receiver_node->buf;
373 s->fc->in_loaded = &s->receiver_node->loaded;
374 s->fc->input_error = &s->receiver_node->task.error;
375 s->fc->task.pre_select = filter_pre_select;
376 s->fc->task.post_select = NULL;
377 s->fc->task.error = 0;
378 s->fc->num_filters = nf;
379
380 s->receiver_node->output_error = &s->fc->task.error;
381 sprintf(s->fc->task.status, "filter chain");
382 FOR_EACH_FILTER_NODE(fn, s->fc, i) {
383 struct filter *f = filters + a->filter_nums[i];
384 fn->filter_num = a->filter_nums[i];
385 fn->conf = a->filter_conf[i];
386 fn->fc = s->fc;
387 fn->loaded = 0;
388 INIT_LIST_HEAD(&fn->callbacks);
389 f->open(fn);
390 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
391 audio_formats[s->format], i, nf, f->name, slot_num);
392 s->fc->outbuf = fn->buf;
393 s->fc->out_loaded = &fn->loaded;
394 }
395 register_task(&s->fc->task);
396 }
397
398 static void open_writers(int slot_num)
399 {
400 int ret, i;
401 struct slot_info *s = &slot[slot_num];
402 struct audio_format_info *a = &afi[s->format];
403
404 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
405 if (!a->num_writers)
406 s->wng = setup_default_wng();
407 else
408 s->wng = wng_new(a->num_writers);
409 if (s->fc) {
410 s->wng->buf = s->fc->outbuf;
411 s->wng->loaded = s->fc->out_loaded;
412 s->wng->input_error = &s->fc->task.error;
413 s->wng->channels = &s->fc->channels;
414 s->wng->samplerate = &s->fc->samplerate;
415 s->fc->output_error = &s->wng->task.error;
416 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
417 } else {
418 s->wng->buf = s->receiver_node->buf;
419 s->wng->loaded = &s->receiver_node->loaded;
420 s->wng->input_error = &s->receiver_node->task.error;
421 }
422 for (i = 0; i < a->num_writers; i++) {
423 s->wng->writer_nodes[i].conf = a->writer_conf[i];
424 s->wng->writer_nodes[i].writer = a->writers[i];
425 }
426 ret = wng_open(s->wng);
427 if (ret < 0) {
428 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
429 return;
430 }
431 s->wstime = *now;
432 activate_inactive_grab_clients(slot_num, s->format, s->fc);
433 }
434
435 static int open_receiver(int format)
436 {
437 struct audio_format_info *a = &afi[format];
438 struct slot_info *s;
439 int ret, slot_num;
440 struct receiver_node *rn;
441 const struct timeval restart_delay = {2, 0};
442
443 ret = get_empty_slot();
444 if (ret < 0)
445 goto err;
446 slot_num = ret;
447 s = &slot[slot_num];
448 s->format = format;
449 s->receiver_node = para_calloc(sizeof(struct receiver_node));
450 rn = s->receiver_node;
451 rn->receiver = a->receiver;
452 rn->conf = a->receiver_conf;
453 ret = a->receiver->open(s->receiver_node);
454 if (ret < 0) {
455 free(s->receiver_node);
456 s->receiver_node = NULL;
457 goto err;
458 }
459 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
460 audio_formats[s->format], a->receiver->name, slot_num);
461 rn->task.pre_select = a->receiver->pre_select;
462 rn->task.post_select = a->receiver->post_select;
463 sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
464 register_task(&rn->task);
465 ret = 1;
466 err:
467 if (ret < 0)
468 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
469 tv_add(now, &restart_delay, &afi[format].restart_barrier);
470 return ret;
471 }
472
473 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
474 static int receiver_running(int format)
475 {
476 int i, ret = 0;
477
478 FOR_EACH_SLOT(i) {
479 struct slot_info *s = &slot[i];
480 if (s->format != format)
481 continue;
482 if (!s->receiver_node)
483 continue;
484 if (s->receiver_node->task.error >= 0)
485 return 1;
486 ret = -1;
487 }
488 return ret;
489 }
490
491 static void open_current_receiver(struct sched *s)
492 {
493 struct timeval diff;
494 int ret, cafn = stat_task->current_audio_format_num;
495
496 if (cafn < 0 || !stat_task->ct)
497 return;
498 /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
499 if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
500 return;
501 ret = receiver_running(cafn);
502 if (ret > 0) /* already running and not eof */
503 return;
504 if (ret < 0) { /* eof */
505 /*
506 * para_server uses a zero start time during the announcement
507 * period, i.e. before it sends the first chunk. Wait until
508 * this period begins to avoid restarting the receiver that
509 * belongs to the file just completed.
510 */
511 if (stat_task->server_stream_start.tv_sec)
512 return;
513 }
514 if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
515 /* avoid busy loop */
516 s->timeout = diff;
517 return;
518 }
519 /* start a new receiver */
520 open_receiver(cafn);
521 }
522
523 static unsigned compute_time_diff(const struct timeval *status_time)
524 {
525 struct timeval tmp, diff;
526 static unsigned count;
527 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
528 const struct timeval max_deviation = {0, 500 * 1000};
529 const int time_smooth = 5;
530
531 if (!status_time)
532 return count;
533 sign = tv_diff(status_time, now, &diff);
534 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
535 // sign, sa_time_diff_sign);
536 if (!count) {
537 sa_time_diff_sign = sign;
538 stat_task->sa_time_diff = diff;
539 count++;
540 goto out;
541 }
542 if (count > 5) {
543 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
544 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
545 PARA_WARNING_LOG("time diff jump: %lims\n",
546 s * tv2ms(&tmp));
547 }
548 count++;
549 sa_time_diff_sign = tv_convex_combination(
550 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
551 count > 10? sign : sign * time_smooth, &diff,
552 &tmp);
553 stat_task->sa_time_diff = tmp;
554 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
555 sign > 0? "+" : "-",
556 tv2ms(&diff),
557 sa_time_diff_sign ? "+" : "-",
558 tv2ms(&stat_task->sa_time_diff)
559 );
560 out:
561 stat_task->sa_time_diff_sign = sa_time_diff_sign;
562 return count;
563 }
564
565 static int check_stat_line(char *line, __a_unused void *data)
566 {
567 int itemnum;
568 size_t ilen = 0;
569 long unsigned sec, usec;
570 char *tmp;
571
572 //PARA_INFO_LOG("line: %s\n", line);
573 if (!line)
574 return 1;
575 itemnum = stat_line_valid(line);
576 if (itemnum < 0) {
577 PARA_WARNING_LOG("invalid status line: %s\n", line);
578 return 1;
579 }
580 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
581 return 1;
582 tmp = make_message("%s\n", line);
583 stat_client_write(tmp, itemnum);
584 free(tmp);
585 free(stat_item_values[itemnum]);
586 stat_item_values[itemnum] = para_strdup(line);
587 ilen = strlen(status_item_list[itemnum]);
588 switch (itemnum) {
589 case SI_STATUS_FLAGS:
590 stat_task->vss_status = 0;
591 if (strchr(line, 'N'))
592 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
593 if (strchr(line, 'P'))
594 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
595 break;
596 case SI_OFFSET:
597 stat_task->offset_seconds = atoi(line + ilen + 1);
598 break;
599 case SI_SECONDS_TOTAL:
600 stat_task->length_seconds = atoi(line + ilen + 1);
601 break;
602 case SI_STREAM_START:
603 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
604 struct timeval a_start, delay;
605 delay.tv_sec = conf.stream_delay_arg / 1000;
606 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
607 stat_task->server_stream_start.tv_sec = sec;
608 stat_task->server_stream_start.tv_usec = usec;
609 if (compute_time_diff(NULL) > 2) {
610 if (stat_task->sa_time_diff_sign < 0)
611 tv_add(&stat_task->server_stream_start,
612 &stat_task->sa_time_diff, &a_start);
613 else
614 tv_diff(&stat_task->server_stream_start,
615 &stat_task->sa_time_diff, &a_start);
616 tv_add(&a_start, &delay, &initial_delay_barrier);
617 }
618 }
619 break;
620 case SI_CURRENT_TIME:
621 if (sscanf(line + ilen + 1, "%lu.%lu", &sec, &usec) == 2) {
622 struct timeval tv = {sec, usec};
623 compute_time_diff(&tv);
624 }
625 break;
626 case SI_FORMAT:
627 stat_task->current_audio_format_num = get_audio_format_num(
628 line + ilen + 1);
629 }
630 return 1;
631 }
632
633 static int parse_stream_command(const char *txt, char **cmd)
634 {
635 char *p = strchr(txt, ':');
636 int i;
637
638 if (!p)
639 return -E_MISSING_COLON;
640 p++;
641 FOR_EACH_AUDIO_FORMAT(i) {
642 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
643 continue;
644 *cmd = p;
645 return i;
646 }
647 return -E_UNSUPPORTED_AUDIO_FORMAT;
648 }
649
650 static int add_filter(int format, char *cmdline)
651 {
652 struct audio_format_info *a = &afi[format];
653 int filter_num, nf = a->num_filters;
654
655 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
656 if (filter_num < 0)
657 return filter_num;
658 a->filter_nums[nf] = filter_num;
659 a->num_filters++;
660 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
661 filters[filter_num].name);
662 return filter_num;
663 }
664
665 static int parse_writer_args(void)
666 {
667 int i, ret, nw;
668 char *cmd;
669 struct audio_format_info *a;
670
671 nw = PARA_MAX(1U, conf.writer_given);
672 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
673 FOR_EACH_AUDIO_FORMAT(i) {
674 a = &afi[i];
675 a->writer_conf = para_malloc(nw * sizeof(void *));
676 a->writers = para_malloc(nw * sizeof(struct writer *));
677 a->num_writers = 0;
678 }
679 for (i = 0; i < conf.writer_given; i++) {
680 void *wconf;
681 int writer_num;
682 ret = parse_stream_command(conf.writer_arg[i], &cmd);
683 if (ret < 0)
684 goto out;
685 a = &afi[ret];
686 nw = a->num_writers;
687 wconf = check_writer_arg(cmd, &writer_num);
688 if (!wconf) {
689 ret = writer_num;
690 goto out;
691 }
692 a->writers[nw] = &writers[writer_num];
693 a->writer_conf[nw] = wconf;
694 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
695 nw, writer_names[writer_num]);
696 a->num_writers++;
697 }
698 ret = 1;
699 out:
700 return ret;
701 }
702
703 static int parse_receiver_args(void)
704 {
705 int i, ret, receiver_num;
706 char *cmd = NULL;
707 struct audio_format_info *a;
708
709 for (i = conf.receiver_given - 1; i >= 0; i--) {
710 char *arg = conf.receiver_arg[i];
711 char *recv_arg = strchr(arg, ':');
712 ret = -E_MISSING_COLON;
713 if (!recv_arg)
714 goto out;
715 *recv_arg = '\0';
716 recv_arg++;
717 ret = get_audio_format_num(arg);
718 if (ret < 0)
719 goto out;
720 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
721 if (!afi[ret].receiver_conf) {
722 ret = -E_RECV_SYNTAX;
723 goto out;
724 }
725 afi[ret].receiver = &receivers[receiver_num];
726 }
727 /* use the first available receiver with no arguments
728 * for those audio formats for which no receiver
729 * was specified
730 */
731 cmd = para_strdup(receivers[0].name);
732 FOR_EACH_AUDIO_FORMAT(i) {
733 a = &afi[i];
734 if (a->receiver_conf)
735 continue;
736 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
737 if (!a->receiver_conf)
738 return -E_RECV_SYNTAX;
739 a->receiver = &receivers[receiver_num];
740 }
741 ret = 1;
742 out:
743 free(cmd);
744 return ret;
745 }
746
747 static int init_default_filters(void)
748 {
749 int i, ret = 1;
750
751 FOR_EACH_AUDIO_FORMAT(i) {
752 struct audio_format_info *a = &afi[i];
753 char *tmp;
754 int j;
755
756 if (a->num_filters)
757 continue; /* no default -- nothing to to */
758 /* add "dec" to audio format name */
759 tmp = make_message("%sdec", audio_formats[i]);
760 for (j = 0; filters[j].name; j++)
761 if (!strcmp(tmp, filters[j].name))
762 break;
763 free(tmp);
764 ret = -E_UNSUPPORTED_FILTER;
765 if (!filters[j].name)
766 goto out;
767 tmp = para_strdup(filters[j].name);
768 ret = add_filter(i, tmp);
769 free(tmp);
770 if (ret < 0)
771 goto out;
772 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
773 filters[j].name);
774 }
775 out:
776 return ret;
777 }
778
779 static int parse_filter_args(void)
780 {
781 int i, ret, nf;
782
783 nf = PARA_MAX(1U, conf.filter_given);
784 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
785 FOR_EACH_AUDIO_FORMAT(i) {
786 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
787 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
788 }
789 if (!conf.no_default_filters_given)
790 return init_default_filters();
791 for (i = 0; i < conf.filter_given; i++) {
792 char *arg = conf.filter_arg[i];
793 char *filter_name = strchr(arg, ':');
794 ret = -E_MISSING_COLON;
795 if (!filter_name)
796 goto out;
797 *filter_name = '\0';
798 filter_name++;
799 ret = get_audio_format_num(arg);
800 if (ret < 0)
801 goto out;
802 ret = add_filter(ret, filter_name);
803 if (ret < 0)
804 goto out;
805 }
806 ret = init_default_filters(); /* use default values for the rest */
807 out:
808 return ret;
809 }
810
811 static int parse_stream_args(void)
812 {
813 int ret;
814
815 ret = parse_receiver_args();
816 if (ret < 0)
817 return ret;
818 ret = parse_filter_args();
819 if (ret < 0)
820 return ret;
821 ret = parse_writer_args();
822 if (ret < 0)
823 return ret;
824 return 1;
825 }
826
827 /* does not unlink socket on errors */
828 static int audiod_get_socket(void)
829 {
830 struct sockaddr_un unix_addr;
831 int ret, fd;
832
833 if (conf.socket_given)
834 socket_name = para_strdup(conf.socket_arg);
835 else {
836 char *hn = para_hostname();
837 socket_name = make_message("/var/paraslash/audiod_socket.%s",
838 hn);
839 free(hn);
840 }
841 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
842 if (conf.force_given)
843 unlink(socket_name);
844 ret = create_local_socket(socket_name, &unix_addr,
845 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
846 if (ret < 0)
847 goto err;
848 fd = ret;
849 if (listen(fd , 5) < 0) {
850 ret = -ERRNO_TO_PARA_ERROR(errno);
851 goto err;
852 }
853 ret = mark_fd_nonblocking(fd);
854 if (ret < 0)
855 goto err;
856 return fd;
857 err:
858 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
859 exit(EXIT_FAILURE);
860 }
861
862 static void signal_pre_select(struct sched *s, struct task *t)
863 {
864 struct signal_task *st = container_of(t, struct signal_task, task);
865 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
866 }
867
868 static void signal_post_select(struct sched *s, struct task *t)
869 {
870 struct signal_task *st = container_of(t, struct signal_task, task);
871
872 if (!FD_ISSET(st->fd, &s->rfds))
873 return;
874
875 st->signum = para_next_signal();
876 switch (st->signum) {
877 case SIGINT:
878 case SIGTERM:
879 case SIGHUP:
880 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
881 clean_exit(EXIT_FAILURE, "caught deadly signal");
882 }
883 }
884
885 static void signal_setup_default(struct signal_task *st)
886 {
887 st->task.pre_select = signal_pre_select;
888 st->task.post_select = signal_post_select;
889 sprintf(st->task.status, "signal task");
890 }
891
892 static void command_pre_select(struct sched *s, struct task *t)
893 {
894 struct command_task *ct = container_of(t, struct command_task, task);
895 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
896 }
897
898 static void command_post_select(struct sched *s, struct task *t)
899 {
900 int ret;
901 struct command_task *ct = container_of(t, struct command_task, task);
902
903 audiod_status_dump();
904 if (!FD_ISSET(ct->fd, &s->rfds))
905 return;
906 ret = handle_connect(ct->fd);
907 if (ret < 0)
908 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
909 }
910
911 static void init_command_task(struct command_task *ct)
912 {
913 ct->task.pre_select = command_pre_select;
914 ct->task.post_select = command_post_select;
915 ct->task.error = 0;
916 ct->fd = audiod_get_socket(); /* doesn't return on errors */
917 sprintf(ct->task.status, "command task");
918 }
919
920 static void close_stat_pipe(void)
921 {
922 int i;
923
924 if (!stat_task->ct)
925 return;
926 client_close(stat_task->ct);
927 stat_task->ct = NULL;
928 FOR_EACH_STATUS_ITEM(i) {
929 free(stat_item_values[i]);
930 stat_item_values[i] = NULL;
931 }
932 dump_empty_status();
933 stat_task->length_seconds = 0;
934 stat_task->offset_seconds = 0;
935 stat_task->vss_status = 0;
936 audiod_status_dump();
937 }
938
939 /**
940 * close the connection to para_server and exit
941 *
942 * \param status the exit status which is passed to exit(3)
943 * \param msg the log message
944 *
945 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
946 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
947 * EXIT_FAILURE.
948 *
949 * \sa exit(3)
950 */
951 void __noreturn clean_exit(int status, const char *msg)
952 {
953 PARA_EMERG_LOG("%s\n", msg);
954 if (socket_name)
955 unlink(socket_name);
956 close_stat_pipe();
957 exit(status);
958 }
959
960 /* avoid busy loop if server is down */
961 static void set_stat_task_restart_barrier(unsigned seconds)
962 {
963 struct timeval delay = {seconds, 0};
964 tv_add(now, &delay, &stat_task->restart_barrier);
965 }
966
967 static void try_to_close_slot(int slot_num)
968 {
969 struct slot_info *s = &slot[slot_num];
970
971 if (s->format < 0)
972 return;
973 if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
974 return;
975 if (s->fc && s->fc->task.error != -E_TASK_UNREGISTERED)
976 return;
977 if (s->wng && s->wng->task.error != -E_TASK_UNREGISTERED)
978 return;
979 PARA_INFO_LOG("closing slot %d\n", slot_num);
980 wng_close(s->wng);
981 close_filters(s->fc);
982 free(s->fc);
983 close_receiver(slot_num);
984 clear_slot(slot_num);
985 }
986
987 /*
988 * Check if any receivers/filters/writers need to be started and do so if
989 * necessary.
990 */
991 static void start_stop_decoders(struct sched *s)
992 {
993 int i;
994
995 FOR_EACH_SLOT(i)
996 try_to_close_slot(i);
997 if (audiod_status != AUDIOD_ON ||
998 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
999 return kill_all_decoders(-E_NOT_PLAYING);
1000 open_current_receiver(s);
1001 FOR_EACH_SLOT(i) {
1002 struct slot_info *sl = &slot[i];
1003 struct audio_format_info *a;
1004 struct timeval diff;
1005
1006 if (sl->format < 0)
1007 continue;
1008 a = &afi[sl->format];
1009 if (!sl->receiver_node)
1010 continue;
1011 if ((!a->num_filters || sl->fc) && sl->wng)
1012 continue; /* everything already started */
1013 if (!a->num_filters) {
1014 if (sl->receiver_node->loaded && !sl->wng) {
1015 open_writers(i);
1016 }
1017 continue;
1018 }
1019 if (sl->receiver_node->loaded && !sl->fc) {
1020 open_filters(i);
1021 continue;
1022 }
1023 if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
1024 continue;
1025 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
1026 open_writers(i);
1027 continue;
1028 }
1029 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
1030 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
1031 s->timeout = diff;
1032 }
1033 }
1034 }
1035
1036
1037 /* restart the client task if necessary */
1038 static void status_pre_select(struct sched *s, struct task *t)
1039 {
1040 struct status_task *st = container_of(t, struct status_task, task);
1041
1042 if (audiod_status == AUDIOD_OFF) {
1043 if (!st->ct)
1044 goto out;
1045 if (st->ct->task.error >= 0) {
1046 st->ct->task.error = -E_AUDIOD_OFF;
1047 goto out;
1048 }
1049 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1050 goto out;
1051 close_stat_pipe();
1052 st->clock_diff_count = conf.clock_diff_count_arg;
1053 goto out;
1054 }
1055 if (st->ct) {
1056 unsigned bytes_left;
1057 if (st->ct->task.error < 0) {
1058 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1059 goto out;
1060 close_stat_pipe();
1061 goto out;
1062 }
1063 if (st->ct->status != CL_RECEIVING)
1064 goto out;
1065 bytes_left = for_each_line(st->ct->buf, st->ct->loaded,
1066 &check_stat_line, NULL);
1067 if (st->ct->loaded != bytes_left) {
1068 st->last_status_read = *now;
1069 st->ct->loaded = bytes_left;
1070 } else {
1071 struct timeval diff;
1072 tv_diff(now, &st->last_status_read, &diff);
1073 if (diff.tv_sec > 61)
1074 st->ct->task.error = -E_STATUS_TIMEOUT;
1075 }
1076 goto out;
1077 }
1078 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1079 goto out;
1080 if (st->clock_diff_count) { /* get status only one time */
1081 char *argv[] = {"audiod", "stat", "1", NULL};
1082 int argc = 3;
1083 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1084 st->clock_diff_count--;
1085 client_open(argc, argv, &st->ct, NULL);
1086 set_stat_task_restart_barrier(2);
1087
1088 } else {
1089 char *argv[] = {"audiod", "stat", NULL};
1090 int argc = 2;
1091 client_open(argc, argv, &st->ct, NULL);
1092 set_stat_task_restart_barrier(5);
1093 }
1094 free(stat_item_values[SI_BASENAME]);
1095 stat_item_values[SI_BASENAME] = make_message(
1096 "%s: no connection to para_server\n",
1097 status_item_list[SI_BASENAME]);
1098 stat_client_write(stat_item_values[SI_BASENAME],
1099 SI_BASENAME);
1100 st->last_status_read = *now;
1101 out:
1102 start_stop_decoders(s);
1103 }
1104
1105 static void init_status_task(struct status_task *st)
1106 {
1107 memset(st, 0, sizeof(struct status_task));
1108 st->task.pre_select = status_pre_select;
1109 st->sa_time_diff_sign = 1;
1110 st->clock_diff_count = conf.clock_diff_count_arg;
1111 st->current_audio_format_num = -1;
1112 sprintf(st->task.status, "status task");
1113 }
1114
1115 static void set_initial_status(void)
1116 {
1117 audiod_status = AUDIOD_ON;
1118 if (!conf.mode_given)
1119 return;
1120 if (!strcmp(conf.mode_arg, "sb")) {
1121 audiod_status = AUDIOD_STANDBY;
1122 return;
1123 }
1124 if (!strcmp(conf.mode_arg, "off")) {
1125 audiod_status = AUDIOD_OFF;
1126 return;
1127 }
1128 if (strcmp(conf.mode_arg, "on"))
1129 PARA_WARNING_LOG("invalid mode\n");
1130 }
1131
1132 __noreturn static void print_help_and_die(void)
1133 {
1134 int d = conf.detailed_help_given;
1135 const char **p = d? audiod_args_info_detailed_help
1136 : audiod_args_info_help;
1137
1138 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1139 AUDIOD_CMDLINE_PARSER_VERSION);
1140 printf_or_die("%s\n\n", audiod_args_info_usage);
1141 for (; *p; p++)
1142 printf_or_die("%s\n", *p);
1143 print_receiver_helps(d);
1144 print_filter_helps(d);
1145 print_writer_helps(d);
1146 exit(0);
1147 }
1148
1149 static void init_colors_or_die(void)
1150 {
1151 int ret, i;
1152
1153 if (!want_colors())
1154 return;
1155 daemon_set_default_log_colors();
1156 daemon_set_flag(DF_COLOR_LOG);
1157 for (i = 0; i < conf.log_color_given; i++) {
1158 ret = daemon_set_log_color(conf.log_color_arg[i]);
1159 if (ret < 0)
1160 exit(EXIT_FAILURE);
1161 }
1162 }
1163
1164 /**
1165 * the main function of para_audiod
1166 *
1167 * \param argc usual argument count
1168 * \param argv usual argument vector
1169 *
1170 * \return EXIT_SUCCESS or EXIT_FAILURE
1171 *
1172 * \sa para_audiod(1)
1173 * */
1174 int main(int argc, char *argv[])
1175 {
1176 int ret, i;
1177 static struct sched s;
1178 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1179 struct audiod_cmdline_parser_params params = {
1180 .override = 0,
1181 .initialize = 1,
1182 .check_required = 0,
1183 .check_ambiguity = 0,
1184 .print_errors = 1
1185 };
1186
1187 valid_fd_012();
1188 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1189 exit(EXIT_FAILURE);
1190 HANDLE_VERSION_FLAG("audiod", conf);
1191 /* init receivers/filters/writers early to make help work */
1192 recv_init();
1193 filter_init();
1194 writer_init();
1195 if (conf.help_given || conf.detailed_help_given)
1196 print_help_and_die();
1197 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1198 parse_config_or_die();
1199 init_colors_or_die();
1200 daemon_set_flag(DF_LOG_TIME);
1201 daemon_set_flag(DF_LOG_HOSTNAME);
1202 daemon_set_flag(DF_LOG_LL);
1203 if (conf.logfile_given) {
1204 daemon_set_logfile(conf.logfile_arg);
1205 daemon_open_log_or_die();
1206 }
1207 ret = parse_stream_args();
1208 if (ret < 0) {
1209 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1210 exit(EXIT_FAILURE);
1211 }
1212 log_welcome("para_audiod");
1213 server_uptime(UPTIME_SET);
1214 set_initial_status();
1215 FOR_EACH_SLOT(i)
1216 clear_slot(i);
1217 init_grabbing();
1218 setup_signal_handling();
1219 signal_setup_default(sig_task);
1220
1221 init_status_task(stat_task);
1222 init_command_task(cmd_task);
1223
1224 if (conf.daemon_given)
1225 daemonize();
1226
1227 register_task(&sig_task->task);
1228 register_task(&cmd_task->task);
1229 register_task(&stat_task->task);
1230 s.default_timeout.tv_sec = 0;
1231 s.default_timeout.tv_usec = 99 * 1000;
1232 ret = schedule(&s);
1233
1234 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1235 return EXIT_FAILURE;
1236 }