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