com_stat(): Return a proper error message if an invalid option was given.
[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 #include <openssl/rc4.h>
12
13 #include "para.h"
14 #include "error.h"
15 #include "crypt.h"
16 #include "audiod.cmdline.h"
17 #include "list.h"
18 #include "sched.h"
19 #include "ggo.h"
20 #include "recv.h"
21 #include "filter.h"
22 #include "grab_client.h"
23 #include "client.cmdline.h"
24 #include "client.h"
25 #include "audiod.h"
26 #include "net.h"
27 #include "daemon.h"
28 #include "string.h"
29 #include "fd.h"
30 #include "write.h"
31 #include "write_common.h"
32 #include "signal.h"
33
34 /** define the array of error lists needed by para_audiod */
35 INIT_AUDIOD_ERRLISTS;
36 /** define the array containing all supported audio formats */
37 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
38
39 /** Defines how audiod handles one supported audio format. */
40 struct audio_format_info {
41 /** pointer to the receiver for this audio format */
42 struct receiver *receiver;
43 /** the receiver configuration */
44 void *receiver_conf;
45 /** the number of filters that should be activated for this audio format */
46 unsigned int num_filters;
47 /** Array of filter numbers to be activated. */
48 unsigned *filter_nums;
49 /** Pointer to the array of filter configurations. */
50 void **filter_conf;
51 /** the number of filters that should be activated for this audio format */
52 unsigned int num_writers;
53 /** Array of writer numbers to be activated. */
54 int *writer_nums;
55 /** pointer to the array of writer configurations */
56 void **writer_conf;
57 /** do not start receiver/filters/writer before this time */
58 struct timeval restart_barrier;
59 };
60
61 /**
62 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
63 * be associated with a receiver/filter/writer triple. This array holds all
64 * information on the status of these slots.
65 *
66 * \sa struct slot_info
67 * */
68 struct slot_info slot[MAX_STREAM_SLOTS];
69
70 /** The vss status flags audiod is interested in. */
71 enum vss_status_flags {
72 /** Whether the 'N' flag is set. */
73 VSS_STATUS_FLAG_NEXT = 1,
74 /** The 'P' flag is set. */
75 VSS_STATUS_FLAG_PLAYING = 2,
76 };
77
78 /**
79 * The task for obtaining para_server's status (para_client stat).
80 *
81 * \sa struct task, struct sched.
82 */
83 struct status_task {
84 /** The associated task structure of audiod. */
85 struct task task;
86 /** Client data associated with the stat task. */
87 struct client_task *ct;
88 /** Do not restart client command until this time. */
89 struct timeval restart_barrier;
90 /** Last time we received status data from para_server. */
91 struct timeval last_status_read;
92 /** The offset value announced by para_server. */
93 int offset_seconds;
94 /** The length of the current audio file as announced by para_server. */
95 int length_seconds;
96 /** The start of the current stream from the view of para_server. */
97 struct timeval server_stream_start;
98 /** The average time deviation between para_server and para_audiod. */
99 struct timeval sa_time_diff;
100 /** Whether client time is ahead of server time. */
101 int sa_time_diff_sign;
102 /** The 'P' and the 'N' flags as announced by para_server. */
103 enum vss_status_flags vss_status;
104 /** Number of times the clock difference is to be checked. */
105 unsigned clock_diff_count;
106 /** When to start the next check for clock difference. */
107 struct timeval clock_diff_barrier;
108 /** Number of the audio format as announced by para_server. */
109 int current_audio_format_num;
110 };
111
112 /** The array of status items sent by para_server. */
113 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
114
115 /**
116 * the current mode of operation of which can be changed by the on/off/cycle
117 * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
118 */
119 int audiod_status = AUDIOD_ON;
120
121 /**
122 * the gengetopt args_info struct that holds information on all command line
123 * arguments
124 */
125 struct audiod_args_info conf;
126
127 static char *socket_name;
128 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
129
130 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
131
132 static struct status_task status_task_struct;
133
134 /**
135 * the task that calls the status command of para_server
136 *
137 * \sa struct status_task
138 */
139 static struct status_task *stat_task = &status_task_struct;
140 static struct timeval initial_delay_barrier;
141
142 /**
143 * the task for handling audiod commands
144 *
145 * \sa struct task, struct sched
146 */
147 struct command_task {
148 /** the local listening socket */
149 int fd;
150 /** the associated task structure */
151 struct task task;
152 };
153
154 /** iterate over all supported audio formats */
155 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
156
157 /**
158 * get the audio format number
159 * \param name the name of the audio format
160 *
161 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
162 * \a name is not a supported audio format.
163 */
164 int get_audio_format_num(const char *name)
165 {
166 int i;
167
168 while (para_isspace(*name))
169 name++;
170 FOR_EACH_AUDIO_FORMAT(i)
171 if (!strcmp(name, audio_formats[i]))
172 return i;
173 return -E_UNSUPPORTED_AUDIO_FORMAT;
174 }
175
176 char *get_time_string(int slot_num)
177 {
178 int ret, seconds = 0, length;
179 struct timeval *tmp, sum, sss, /* server stream start */
180 wtime, /* now - writer start */
181 rskip; /* receiver start - sss */
182 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
183
184 if (audiod_status == AUDIOD_OFF)
185 goto empty;
186 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
187 if (stat_task->length_seconds) /* paused */
188 return NULL;
189 goto empty; /* stopped */
190 }
191 if (audiod_status == AUDIOD_ON && !s)
192 goto empty;
193 /* valid status items and playing */
194 if (s) { /* writer active in this slot */
195 length = s->seconds_total;
196 tmp = &s->server_stream_start;
197 } else { /* standby mode, rely on status items */
198 length = stat_task->length_seconds;
199 tmp = &stat_task->server_stream_start;
200 }
201 if (stat_task->sa_time_diff_sign > 0)
202 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
203 else
204 tv_add(tmp, &stat_task->sa_time_diff, &sss);
205 if (!s) {
206 struct timeval diff;
207 tv_diff(now, &sss, &diff);
208 seconds = diff.tv_sec + stat_task->offset_seconds;
209 goto out;
210 }
211 tv_diff(now, &s->wstime, &wtime);
212 seconds = s->offset_seconds;
213 ret = tv_diff(&s->rstime, &sss, &rskip);
214 if (ret > 0) { /* audiod was started in the middle of the stream */
215 tv_add(&wtime, &rskip, &sum);
216 seconds += sum.tv_sec;
217 } else
218 seconds += wtime.tv_sec;
219 out:
220 seconds = PARA_MIN(seconds, length);
221 seconds = PARA_MAX(seconds, 0);
222 return make_message(
223 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
224 s? "" : "~",
225 seconds / 60,
226 seconds % 60,
227 (length - seconds) / 60,
228 (length - seconds) % 60,
229 length? (seconds * 100 + length / 2) / length : 0,
230 length / 60,
231 length % 60
232 );
233 empty:
234 return para_strdup(NULL);
235 }
236
237 static int want_colors(void)
238 {
239 if (conf.color_arg == color_arg_no)
240 return 0;
241 if (conf.color_arg == color_arg_yes)
242 return 1;
243 if (conf.logfile_given)
244 return 0;
245 return isatty(STDERR_FILENO);
246 }
247
248 static void parse_config_or_die(void)
249 {
250 int ret;
251 char *config_file;
252 struct audiod_cmdline_parser_params params = {
253 .override = 0,
254 .initialize = 0,
255 .check_required = 1,
256 .check_ambiguity = 0,
257 .print_errors = 1
258 };
259
260 if (conf.config_file_given)
261 config_file = para_strdup(conf.config_file_arg);
262 else {
263 char *home = para_homedir();
264 config_file = make_message("%s/.paraslash/audiod.conf", home);
265 free(home);
266 }
267 ret = file_exists(config_file);
268 if (conf.config_file_given && !ret) {
269 PARA_EMERG_LOG("can not read config file %s\n", config_file);
270 goto err;
271 }
272 if (ret)
273 audiod_cmdline_parser_config_file(config_file, &conf, &params);
274 free(config_file);
275 daemon_set_loglevel(conf.loglevel_arg);
276 return;
277 err:
278 free(config_file);
279 exit(EXIT_FAILURE);
280 }
281
282 static void setup_signal_handling(void)
283 {
284 sig_task->fd = para_signal_init();
285 PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
286 para_install_sighandler(SIGINT);
287 para_install_sighandler(SIGTERM);
288 para_install_sighandler(SIGHUP);
289 para_sigaction(SIGPIPE, SIG_IGN);
290 }
291
292 static void clear_slot(int slot_num)
293 {
294 struct slot_info *s = &slot[slot_num];
295
296 PARA_INFO_LOG("clearing slot %d\n", slot_num);
297 memset(s, 0, sizeof(struct slot_info));
298 s->format = -1;
299 }
300
301 static void close_receiver(int slot_num)
302 {
303 struct slot_info *s = &slot[slot_num];
304 struct audio_format_info *a;
305
306 if (s->format < 0 || !s->receiver_node)
307 return;
308 a = &afi[s->format];
309 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
310 audio_formats[s->format], slot_num);
311 a->receiver->close(s->receiver_node);
312 free(s->receiver_node);
313 s->receiver_node = NULL;
314 }
315
316 static void kill_all_decoders(int error)
317 {
318 int i;
319
320 FOR_EACH_SLOT(i) {
321 struct slot_info *s = &slot[i];
322 if (s->wng && s->wng->task.error >= 0) {
323 PARA_INFO_LOG("deactivating wng in slot %d\n",
324 i);
325 s->wng->task.error = error;
326 }
327 if (s->fc && s->fc->task.error >= 0) {
328 PARA_INFO_LOG("deactivatimg filter chain in slot %d\n", i);
329 s->fc->task.error = error;
330 }
331 if (s->receiver_node && s->receiver_node->task.error >= 0) {
332 PARA_INFO_LOG("deactivating receiver_node in slot %d\n", i);
333 s->receiver_node->task.error = error;
334 }
335 }
336 }
337
338 static int get_empty_slot(void)
339 {
340 int i;
341 struct slot_info *s;
342
343 FOR_EACH_SLOT(i) {
344 s = &slot[i];
345 if (s->format < 0) {
346 clear_slot(i);
347 return i;
348 }
349 if (s->wng || s->receiver_node || s->fc)
350 continue;
351 clear_slot(i);
352 return i;
353 }
354 return -E_NO_MORE_SLOTS;
355 }
356
357 /**
358 * get the number of filters
359 *
360 * \param audio_format_num the number identifying the audio format
361 *
362 * \return the number of filters for the given audio format
363 *
364 * \sa struct filter;
365 */
366 int num_filters(int audio_format_num)
367 {
368 return afi[audio_format_num].num_filters;
369 }
370
371 static void open_filters(int slot_num)
372 {
373 struct slot_info *s = &slot[slot_num];
374 struct audio_format_info *a = &afi[s->format];
375 struct filter_node *fn;
376 int nf = a->num_filters;
377 int i;
378
379 s->fc = NULL;
380 if (!nf)
381 return;
382 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
383 s->fc = para_calloc(sizeof(struct filter_chain));
384 s->fc->filter_nodes = para_malloc(nf * sizeof(struct filter_node));
385 s->fc->inbufp = &s->receiver_node->buf;
386 s->fc->in_loaded = &s->receiver_node->loaded;
387 s->fc->input_error = &s->receiver_node->task.error;
388 s->fc->task.pre_select = filter_pre_select;
389 s->fc->task.post_select = NULL;
390 s->fc->task.error = 0;
391 s->fc->num_filters = nf;
392
393 s->receiver_node->output_error = &s->fc->task.error;
394 sprintf(s->fc->task.status, "filter chain");
395 FOR_EACH_FILTER_NODE(fn, s->fc, i) {
396 struct filter *f = filters + a->filter_nums[i];
397 fn->filter_num = a->filter_nums[i];
398 fn->conf = a->filter_conf[i];
399 fn->fc = s->fc;
400 fn->loaded = 0;
401 INIT_LIST_HEAD(&fn->callbacks);
402 f->open(fn);
403 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
404 audio_formats[s->format], i, nf, f->name, slot_num);
405 s->fc->outbufp = &fn->buf;
406 s->fc->out_loaded = &fn->loaded;
407 }
408 register_task(&s->fc->task);
409 }
410
411 static void open_writers(int slot_num)
412 {
413 int ret, i;
414 struct slot_info *s = &slot[slot_num];
415 struct audio_format_info *a = &afi[s->format];
416
417 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
418 if (!a->num_writers)
419 s->wng = setup_default_wng();
420 else
421 s->wng = wng_new(a->num_writers);
422 if (s->fc) {
423 s->wng->bufp = s->fc->outbufp;
424 s->wng->loaded = s->fc->out_loaded;
425 s->wng->input_error = &s->fc->task.error;
426 s->wng->channels = &s->fc->channels;
427 s->wng->samplerate = &s->fc->samplerate;
428 s->fc->output_error = &s->wng->task.error;
429 PARA_INFO_LOG("samplerate: %d\n", *s->wng->samplerate);
430 } else {
431 s->wng->bufp = &s->receiver_node->buf;
432 s->wng->loaded = &s->receiver_node->loaded;
433 s->wng->input_error = &s->receiver_node->task.error;
434 }
435 for (i = 0; i < a->num_writers; i++) {
436 s->wng->writer_nodes[i].conf = a->writer_conf[i];
437 s->wng->writer_nodes[i].writer_num = a->writer_nums[i];
438 }
439 ret = wng_open(s->wng);
440 if (ret < 0)
441 return;
442 s->wstime = *now;
443 s->server_stream_start = stat_task->server_stream_start.tv_sec?
444 stat_task->server_stream_start : *now;
445 s->offset_seconds = stat_task->offset_seconds;
446 s->seconds_total = stat_task->length_seconds;
447 activate_inactive_grab_clients(s->format, s->fc);
448 }
449
450 static int open_receiver(int format)
451 {
452 struct audio_format_info *a = &afi[format];
453 struct slot_info *s;
454 int ret, slot_num;
455 struct receiver_node *rn;
456 const struct timeval restart_delay = {2, 0};
457
458 ret = get_empty_slot();
459 if (ret < 0)
460 goto err;
461 slot_num = ret;
462 s = &slot[slot_num];
463 s->format = format;
464 s->receiver_node = para_calloc(sizeof(struct receiver_node));
465 rn = s->receiver_node;
466 rn->receiver = a->receiver;
467 rn->conf = a->receiver_conf;
468 ret = a->receiver->open(s->receiver_node);
469 if (ret < 0) {
470 free(s->receiver_node);
471 s->receiver_node = NULL;
472 goto err;
473 }
474 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
475 audio_formats[s->format], a->receiver->name, slot_num);
476 rn->task.pre_select = a->receiver->pre_select;
477 rn->task.post_select = a->receiver->post_select;
478 s->rstime = *now;
479 sprintf(rn->task.status, "%s receiver node", rn->receiver->name);
480 register_task(&rn->task);
481 ret = 1;
482 err:
483 if (ret < 0)
484 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
485 tv_add(now, &restart_delay, &afi[format].restart_barrier);
486 return ret;
487 }
488
489 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
490 static int receiver_running(int format)
491 {
492 int i, ret = 0;
493
494 FOR_EACH_SLOT(i) {
495 struct slot_info *s = &slot[i];
496 if (s->format != format)
497 continue;
498 if (!s->receiver_node)
499 continue;
500 if (s->receiver_node->task.error >= 0)
501 return 1;
502 ret = -1;
503 }
504 return ret;
505 }
506
507 static void open_current_receiver(struct sched *s)
508 {
509 struct timeval diff;
510 int ret, cafn = stat_task->current_audio_format_num;
511
512 if (cafn < 0 || !stat_task->ct)
513 return;
514 /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
515 if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
516 return;
517 ret = receiver_running(cafn);
518 if (ret > 0) /* already running and not eof */
519 return;
520 if (ret < 0) { /* eof */
521 /*
522 * para_server uses a zero start time during the announcement
523 * period, i.e. before it sends the first chunk. Wait until
524 * this period begins to avoid restarting the receiver that
525 * belongs to the file just completed.
526 */
527 if (stat_task->server_stream_start.tv_sec)
528 return;
529 }
530 if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
531 /* avoid busy loop */
532 s->timeout = diff;
533 return;
534 }
535 /* start a new receiver */
536 open_receiver(cafn);
537 }
538
539 static unsigned compute_time_diff(const struct timeval *status_time)
540 {
541 struct timeval tmp, diff;
542 static unsigned count;
543 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
544 const struct timeval max_deviation = {0, 500 * 1000};
545 const int time_smooth = 5;
546
547 if (!status_time)
548 return count;
549 sign = tv_diff(status_time, now, &diff);
550 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
551 // sign, sa_time_diff_sign);
552 if (!count) {
553 sa_time_diff_sign = sign;
554 stat_task->sa_time_diff = diff;
555 count++;
556 goto out;
557 }
558 if (count > 5) {
559 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
560 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
561 PARA_WARNING_LOG("time diff jump: %lims\n",
562 s * tv2ms(&tmp));
563 }
564 count++;
565 sa_time_diff_sign = tv_convex_combination(
566 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
567 count > 10? sign : sign * time_smooth, &diff,
568 &tmp);
569 stat_task->sa_time_diff = tmp;
570 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
571 sign > 0? "+" : "-",
572 tv2ms(&diff),
573 sa_time_diff_sign ? "+" : "-",
574 tv2ms(&stat_task->sa_time_diff)
575 );
576 out:
577 stat_task->sa_time_diff_sign = sa_time_diff_sign;
578 return count;
579 }
580
581 static int update_item(int itemnum, char *buf)
582 {
583 long unsigned sec, usec;
584
585 if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
586 return 1;
587 free(stat_item_values[itemnum]);
588 stat_item_values[itemnum] = para_strdup(buf);
589 stat_client_write_item(itemnum);
590 switch (itemnum) {
591 case SI_STATUS_FLAGS:
592 stat_task->vss_status = 0;
593 if (strchr(buf, 'N'))
594 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
595 if (strchr(buf, 'P'))
596 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
597 break;
598 case SI_OFFSET:
599 stat_task->offset_seconds = atoi(buf);
600 break;
601 case SI_SECONDS_TOTAL:
602 stat_task->length_seconds = atoi(buf);
603 break;
604 case SI_STREAM_START:
605 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
606 struct timeval a_start, delay;
607 delay.tv_sec = conf.stream_delay_arg / 1000;
608 delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
609 stat_task->server_stream_start.tv_sec = sec;
610 stat_task->server_stream_start.tv_usec = usec;
611 if (compute_time_diff(NULL) > 2) {
612 if (stat_task->sa_time_diff_sign < 0)
613 tv_add(&stat_task->server_stream_start,
614 &stat_task->sa_time_diff, &a_start);
615 else
616 tv_diff(&stat_task->server_stream_start,
617 &stat_task->sa_time_diff, &a_start);
618 tv_add(&a_start, &delay, &initial_delay_barrier);
619 }
620 }
621 break;
622 case SI_CURRENT_TIME:
623 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
624 struct timeval tv = {sec, usec};
625 compute_time_diff(&tv);
626 }
627 break;
628 case SI_FORMAT:
629 stat_task->current_audio_format_num
630 = get_audio_format_num(buf);
631 }
632 return 1;
633 }
634
635 static int parse_stream_command(const char *txt, char **cmd)
636 {
637 char *p = strchr(txt, ':');
638 int i;
639
640 if (!p)
641 return -E_MISSING_COLON;
642 p++;
643 FOR_EACH_AUDIO_FORMAT(i) {
644 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
645 continue;
646 *cmd = p;
647 return i;
648 }
649 return -E_UNSUPPORTED_AUDIO_FORMAT;
650 }
651
652 static int add_filter(int format, char *cmdline)
653 {
654 struct audio_format_info *a = &afi[format];
655 int filter_num, nf = a->num_filters;
656
657 filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
658 if (filter_num < 0)
659 return filter_num;
660 a->filter_nums[nf] = filter_num;
661 a->num_filters++;
662 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
663 filters[filter_num].name);
664 return filter_num;
665 }
666
667 static int parse_writer_args(void)
668 {
669 int i, ret, nw;
670 char *cmd;
671 struct audio_format_info *a;
672
673 nw = PARA_MAX(1U, conf.writer_given);
674 PARA_INFO_LOG("maximal number of writers: %d\n", nw);
675 FOR_EACH_AUDIO_FORMAT(i) {
676 a = &afi[i];
677 a->writer_conf = para_malloc(nw * sizeof(void *));
678 a->writer_nums = para_malloc(nw * sizeof(int));
679 a->num_writers = 0;
680 }
681 for (i = 0; i < conf.writer_given; i++) {
682 void *wconf;
683 int writer_num;
684 ret = parse_stream_command(conf.writer_arg[i], &cmd);
685 if (ret < 0)
686 goto out;
687 a = &afi[ret];
688 nw = a->num_writers;
689 wconf = check_writer_arg(cmd, &writer_num);
690 if (!wconf) {
691 ret = writer_num;
692 goto out;
693 }
694 a->writer_nums[nw] = writer_num;
695 a->writer_conf[nw] = wconf;
696 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
697 nw, writer_names[writer_num]);
698 a->num_writers++;
699 }
700 ret = 1;
701 out:
702 return ret;
703 }
704
705 static int parse_receiver_args(void)
706 {
707 int i, ret, receiver_num;
708 char *cmd = NULL;
709 struct audio_format_info *a;
710
711 for (i = conf.receiver_given - 1; i >= 0; i--) {
712 char *arg = conf.receiver_arg[i];
713 char *recv_arg = strchr(arg, ':');
714 ret = -E_MISSING_COLON;
715 if (!recv_arg)
716 goto out;
717 *recv_arg = '\0';
718 recv_arg++;
719 ret = get_audio_format_num(arg);
720 if (ret < 0)
721 goto out;
722 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
723 if (!afi[ret].receiver_conf) {
724 ret = -E_RECV_SYNTAX;
725 goto out;
726 }
727 afi[ret].receiver = &receivers[receiver_num];
728 }
729 /* use the first available receiver with no arguments
730 * for those audio formats for which no receiver
731 * was specified
732 */
733 cmd = para_strdup(receivers[0].name);
734 FOR_EACH_AUDIO_FORMAT(i) {
735 a = &afi[i];
736 if (a->receiver_conf)
737 continue;
738 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
739 if (!a->receiver_conf)
740 return -E_RECV_SYNTAX;
741 a->receiver = &receivers[receiver_num];
742 }
743 ret = 1;
744 out:
745 free(cmd);
746 return ret;
747 }
748
749 static int init_default_filters(void)
750 {
751 int i, ret = 1;
752
753 FOR_EACH_AUDIO_FORMAT(i) {
754 struct audio_format_info *a = &afi[i];
755 char *tmp;
756 int j;
757
758 if (a->num_filters)
759 continue; /* no default -- nothing to to */
760 /* add "dec" to audio format name */
761 tmp = make_message("%sdec", audio_formats[i]);
762 for (j = 0; filters[j].name; j++)
763 if (!strcmp(tmp, filters[j].name))
764 break;
765 free(tmp);
766 ret = -E_UNSUPPORTED_FILTER;
767 if (!filters[j].name)
768 goto out;
769 tmp = para_strdup(filters[j].name);
770 ret = add_filter(i, tmp);
771 free(tmp);
772 if (ret < 0)
773 goto out;
774 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
775 filters[j].name);
776 }
777 out:
778 return ret;
779 }
780
781 static int parse_filter_args(void)
782 {
783 int i, ret, nf;
784
785 nf = PARA_MAX(1U, conf.filter_given);
786 PARA_INFO_LOG("maximal number of filters: %d\n", nf);
787 FOR_EACH_AUDIO_FORMAT(i) {
788 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
789 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
790 }
791 if (!conf.no_default_filters_given)
792 return init_default_filters();
793 for (i = 0; i < conf.filter_given; i++) {
794 char *arg = conf.filter_arg[i];
795 char *filter_name = strchr(arg, ':');
796 ret = -E_MISSING_COLON;
797 if (!filter_name)
798 goto out;
799 *filter_name = '\0';
800 filter_name++;
801 ret = get_audio_format_num(arg);
802 if (ret < 0)
803 goto out;
804 ret = add_filter(ret, filter_name);
805 if (ret < 0)
806 goto out;
807 }
808 ret = init_default_filters(); /* use default values for the rest */
809 out:
810 return ret;
811 }
812
813 static int parse_stream_args(void)
814 {
815 int ret;
816
817 ret = parse_receiver_args();
818 if (ret < 0)
819 return ret;
820 ret = parse_filter_args();
821 if (ret < 0)
822 return ret;
823 ret = parse_writer_args();
824 if (ret < 0)
825 return ret;
826 return 1;
827 }
828
829 /* does not unlink socket on errors */
830 static int audiod_get_socket(void)
831 {
832 struct sockaddr_un unix_addr;
833 int ret, fd;
834
835 if (conf.socket_given)
836 socket_name = para_strdup(conf.socket_arg);
837 else {
838 char *hn = para_hostname();
839 socket_name = make_message("/var/paraslash/audiod_socket.%s",
840 hn);
841 free(hn);
842 }
843 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
844 if (conf.force_given)
845 unlink(socket_name);
846 ret = create_local_socket(socket_name, &unix_addr,
847 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
848 if (ret < 0)
849 goto err;
850 fd = ret;
851 if (listen(fd , 5) < 0) {
852 ret = -ERRNO_TO_PARA_ERROR(errno);
853 goto err;
854 }
855 ret = mark_fd_nonblocking(fd);
856 if (ret < 0)
857 goto err;
858 return fd;
859 err:
860 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
861 exit(EXIT_FAILURE);
862 }
863
864 static void signal_pre_select(struct sched *s, struct task *t)
865 {
866 struct signal_task *st = container_of(t, struct signal_task, task);
867 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
868 }
869
870 static void signal_post_select(struct sched *s, struct task *t)
871 {
872 struct signal_task *st = container_of(t, struct signal_task, task);
873
874 if (!FD_ISSET(st->fd, &s->rfds))
875 return;
876
877 st->signum = para_next_signal();
878 switch (st->signum) {
879 case SIGINT:
880 case SIGTERM:
881 case SIGHUP:
882 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
883 clean_exit(EXIT_FAILURE, "caught deadly signal");
884 }
885 }
886
887 static void signal_setup_default(struct signal_task *st)
888 {
889 st->task.pre_select = signal_pre_select;
890 st->task.post_select = signal_post_select;
891 sprintf(st->task.status, "signal task");
892 }
893
894 static void command_pre_select(struct sched *s, struct task *t)
895 {
896 struct command_task *ct = container_of(t, struct command_task, task);
897 para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
898 }
899
900 static void command_post_select(struct sched *s, struct task *t)
901 {
902 int ret;
903 struct command_task *ct = container_of(t, struct command_task, task);
904
905 audiod_status_dump();
906 if (!FD_ISSET(ct->fd, &s->rfds))
907 return;
908 ret = handle_connect(ct->fd);
909 if (ret < 0)
910 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
911 }
912
913 static void init_command_task(struct command_task *ct)
914 {
915 ct->task.pre_select = command_pre_select;
916 ct->task.post_select = command_post_select;
917 ct->task.error = 0;
918 ct->fd = audiod_get_socket(); /* doesn't return on errors */
919 sprintf(ct->task.status, "command task");
920 }
921
922 static void close_stat_pipe(void)
923 {
924 if (!stat_task->ct)
925 return;
926 client_close(stat_task->ct);
927 stat_task->ct = NULL;
928 clear_and_dump_items();
929 stat_task->length_seconds = 0;
930 stat_task->offset_seconds = 0;
931 stat_task->vss_status = 0;
932 audiod_status_dump();
933 }
934
935 /**
936 * close the connection to para_server and exit
937 *
938 * \param status the exit status which is passed to exit(3)
939 * \param msg the log message
940 *
941 * Log \a msg with loglevel \p EMERG, close the connection to para_server if
942 * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
943 * EXIT_FAILURE.
944 *
945 * \sa exit(3)
946 */
947 void __noreturn clean_exit(int status, const char *msg)
948 {
949 PARA_EMERG_LOG("%s\n", msg);
950 if (socket_name)
951 unlink(socket_name);
952 close_stat_pipe();
953 exit(status);
954 }
955
956 /* avoid busy loop if server is down */
957 static void set_stat_task_restart_barrier(unsigned seconds)
958 {
959 struct timeval delay = {seconds, 0};
960 tv_add(now, &delay, &stat_task->restart_barrier);
961 }
962
963 static void try_to_close_slot(int slot_num)
964 {
965 struct slot_info *s = &slot[slot_num];
966
967 if (s->format < 0)
968 return;
969 if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
970 return;
971 if (s->fc && s->fc->task.error != -E_TASK_UNREGISTERED)
972 return;
973 if (s->wng && s->wng->task.error != -E_TASK_UNREGISTERED)
974 return;
975 PARA_INFO_LOG("closing slot %d\n", slot_num);
976 wng_close(s->wng);
977 close_filters(s->fc);
978 free(s->fc);
979 close_receiver(slot_num);
980 clear_slot(slot_num);
981 }
982
983 /*
984 * Check if any receivers/filters/writers need to be started and do so if
985 * necessary.
986 */
987 static void start_stop_decoders(struct sched *s)
988 {
989 int i;
990
991 FOR_EACH_SLOT(i)
992 try_to_close_slot(i);
993 if (audiod_status != AUDIOD_ON ||
994 !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
995 return kill_all_decoders(-E_NOT_PLAYING);
996 open_current_receiver(s);
997 FOR_EACH_SLOT(i) {
998 struct slot_info *sl = &slot[i];
999 struct audio_format_info *a;
1000 struct timeval diff;
1001
1002 if (sl->format < 0)
1003 continue;
1004 a = &afi[sl->format];
1005 if (!sl->receiver_node)
1006 continue;
1007 if ((!a->num_filters || sl->fc) && sl->wng)
1008 continue; /* everything already started */
1009 if (!a->num_filters) {
1010 if (sl->receiver_node->loaded && !sl->wng) {
1011 open_writers(i);
1012 }
1013 continue;
1014 }
1015 if (sl->receiver_node->loaded && !sl->fc) {
1016 open_filters(i);
1017 continue;
1018 }
1019 if (sl->wng || !sl->fc || !*sl->fc->out_loaded)
1020 continue;
1021 if (tv_diff(now, &initial_delay_barrier, &diff) > 0) {
1022 open_writers(i);
1023 continue;
1024 }
1025 PARA_INFO_LOG("initial delay: %lu ms left\n", tv2ms(&diff));
1026 if (tv_diff(&s->timeout, &diff, NULL) > 0) {
1027 s->timeout = diff;
1028 }
1029 }
1030 }
1031
1032
1033 /* restart the client task if necessary */
1034 static void status_pre_select(struct sched *s, struct task *t)
1035 {
1036 struct status_task *st = container_of(t, struct status_task, task);
1037
1038 if (audiod_status == AUDIOD_OFF) {
1039 if (!st->ct)
1040 goto out;
1041 if (st->ct->task.error >= 0) {
1042 st->ct->task.error = -E_AUDIOD_OFF;
1043 goto out;
1044 }
1045 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1046 goto out;
1047 close_stat_pipe();
1048 st->clock_diff_count = conf.clock_diff_count_arg;
1049 goto out;
1050 }
1051 if (st->ct) {
1052 int ret;
1053 if (st->ct->task.error < 0) {
1054 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1055 goto out;
1056 close_stat_pipe();
1057 goto out;
1058 }
1059 if (st->ct->status != CL_RECEIVING)
1060 goto out;
1061 ret = for_each_stat_item(st->ct->buf, st->ct->loaded,
1062 update_item);
1063 if (ret < 0) {
1064 st->ct->task.error = ret;
1065 goto out;
1066 }
1067 if (st->ct->loaded != ret) {
1068 st->last_status_read = *now;
1069 st->ct->loaded = ret;
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", "-p", "1", NULL};
1082 int argc = 5;
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", "-p", NULL};
1090 int argc = 4;
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] = para_strdup(
1096 "no connection to para_server");
1097 stat_client_write_item(SI_BASENAME);
1098 st->last_status_read = *now;
1099 out:
1100 start_stop_decoders(s);
1101 }
1102
1103 static void init_status_task(struct status_task *st)
1104 {
1105 memset(st, 0, sizeof(struct status_task));
1106 st->task.pre_select = status_pre_select;
1107 st->sa_time_diff_sign = 1;
1108 st->clock_diff_count = conf.clock_diff_count_arg;
1109 st->current_audio_format_num = -1;
1110 sprintf(st->task.status, "status task");
1111 }
1112
1113 static void set_initial_status(void)
1114 {
1115 audiod_status = AUDIOD_ON;
1116 if (!conf.mode_given)
1117 return;
1118 if (!strcmp(conf.mode_arg, "sb")) {
1119 audiod_status = AUDIOD_STANDBY;
1120 return;
1121 }
1122 if (!strcmp(conf.mode_arg, "off")) {
1123 audiod_status = AUDIOD_OFF;
1124 return;
1125 }
1126 if (strcmp(conf.mode_arg, "on"))
1127 PARA_WARNING_LOG("invalid mode\n");
1128 }
1129
1130 __noreturn static void print_help_and_die(void)
1131 {
1132 int d = conf.detailed_help_given;
1133 const char **p = d? audiod_args_info_detailed_help
1134 : audiod_args_info_help;
1135
1136 printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1137 AUDIOD_CMDLINE_PARSER_VERSION);
1138 printf_or_die("%s\n\n", audiod_args_info_usage);
1139 for (; *p; p++)
1140 printf_or_die("%s\n", *p);
1141 print_receiver_helps(d);
1142 print_filter_helps(d);
1143 print_writer_helps(d);
1144 exit(0);
1145 }
1146
1147 static void init_colors_or_die(void)
1148 {
1149 int ret, i;
1150
1151 if (!want_colors())
1152 return;
1153 daemon_set_default_log_colors();
1154 daemon_set_flag(DF_COLOR_LOG);
1155 for (i = 0; i < conf.log_color_given; i++) {
1156 ret = daemon_set_log_color(conf.log_color_arg[i]);
1157 if (ret < 0)
1158 exit(EXIT_FAILURE);
1159 }
1160 }
1161
1162 /**
1163 * the main function of para_audiod
1164 *
1165 * \param argc usual argument count
1166 * \param argv usual argument vector
1167 *
1168 * \return EXIT_SUCCESS or EXIT_FAILURE
1169 *
1170 * \sa para_audiod(1)
1171 * */
1172 int main(int argc, char *argv[])
1173 {
1174 int ret, i;
1175 static struct sched s;
1176 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1177 struct audiod_cmdline_parser_params params = {
1178 .override = 0,
1179 .initialize = 1,
1180 .check_required = 0,
1181 .check_ambiguity = 0,
1182 .print_errors = 1
1183 };
1184
1185 valid_fd_012();
1186 if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1187 exit(EXIT_FAILURE);
1188 HANDLE_VERSION_FLAG("audiod", conf);
1189 /* init receivers/filters/writers early to make help work */
1190 recv_init();
1191 filter_init();
1192 writer_init();
1193 if (conf.help_given || conf.detailed_help_given)
1194 print_help_and_die();
1195 drop_privileges_or_die(conf.user_arg, conf.group_arg);
1196 parse_config_or_die();
1197 init_colors_or_die();
1198 daemon_set_flag(DF_LOG_TIME);
1199 daemon_set_flag(DF_LOG_HOSTNAME);
1200 daemon_set_flag(DF_LOG_LL);
1201 if (conf.logfile_given) {
1202 daemon_set_logfile(conf.logfile_arg);
1203 daemon_open_log_or_die();
1204 }
1205 ret = parse_stream_args();
1206 if (ret < 0) {
1207 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1208 exit(EXIT_FAILURE);
1209 }
1210 log_welcome("para_audiod");
1211 server_uptime(UPTIME_SET);
1212 set_initial_status();
1213 FOR_EACH_SLOT(i)
1214 clear_slot(i);
1215 init_grabbing();
1216 setup_signal_handling();
1217 signal_setup_default(sig_task);
1218
1219 init_status_task(stat_task);
1220 init_command_task(cmd_task);
1221
1222 if (conf.daemon_given)
1223 daemonize();
1224
1225 register_task(&sig_task->task);
1226 register_task(&cmd_task->task);
1227 register_task(&stat_task->task);
1228 s.default_timeout.tv_sec = 0;
1229 s.default_timeout.tv_usec = 99 * 1000;
1230 ret = schedule(&s);
1231
1232 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1233 return EXIT_FAILURE;
1234 }