f8dde0c2a2f1427ac38e6e598b7e169ff7d626b0
[paraslash.git] / audiod.c
1 /*
2  * Copyright (C) 2005-2012 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 <regex.h>
9 #include <sys/types.h>
10 #include <signal.h>
11
12 #include "para.h"
13 #include "error.h"
14 #include "crypt.h"
15 #include "audiod.cmdline.h"
16 #include "list.h"
17 #include "sched.h"
18 #include "ggo.h"
19 #include "recv.h"
20 #include "buffer_tree.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 #include "version.h"
34
35 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
36 /** define the array of error lists needed by para_audiod */
37 INIT_AUDIOD_ERRLISTS;
38 /** define the array containing all supported audio formats */
39 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
40
41 /** Defines how audiod handles one supported audio format. */
42 struct audio_format_info {
43         /** pointer to the receiver for this audio format */
44         struct receiver *receiver;
45         /** the receiver configuration */
46         void *receiver_conf;
47         /** the number of filters that should be activated for this audio format */
48         unsigned int num_filters;
49         /** Array of filter numbers to be activated. */
50         unsigned *filter_nums;
51         /** Pointer to the array of filter configurations. */
52         void **filter_conf;
53         /** the number of filters that should be activated for this audio format */
54         unsigned int num_writers;
55         /** Array of writer numbers to be activated. */
56         int *writer_nums;
57         /** pointer to the array of writer configurations */
58         void **writer_conf;
59         /** do not start receiver/filters/writer before this time */
60         struct timeval restart_barrier;
61 };
62
63 /**
64  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
65  * be associated with a receiver/filter/writer triple. This array holds all
66  * information on the status of these slots.
67  *
68  * \sa struct slot_info
69  * */
70 struct slot_info slot[MAX_STREAM_SLOTS];
71
72 /** The vss status flags audiod is interested in. */
73 enum vss_status_flags {
74         /** Whether the 'N' flag is set. */
75         VSS_STATUS_FLAG_NEXT = 1,
76         /** The 'P' flag is set. */
77         VSS_STATUS_FLAG_PLAYING = 2,
78 };
79
80 /**
81  * The scheduler instance of para_audiod.
82  *
83  * This is needed also in audiod_command.c (for the tasks command), so it can
84  * not be made static.
85  */
86 struct sched sched = {.max_fileno = 0};
87
88 /**
89  * The task for obtaining para_server's status (para_client stat).
90  *
91  * \sa struct task, struct sched.
92  */
93 struct status_task {
94         /** The associated task structure of audiod. */
95         struct task task;
96         /** Client data associated with the stat task. */
97         struct client_task *ct;
98         /** Do not restart client command until this time. */
99         struct timeval restart_barrier;
100         /** Last time we received status data from para_server. */
101         struct timeval last_status_read;
102         size_t min_iqs;
103         /** The offset value announced by para_server. */
104         int offset_seconds;
105         /** The length of the current audio file as announced by para_server. */
106         int length_seconds;
107         /** The start of the current stream from the view of para_server. */
108         struct timeval server_stream_start;
109         /** The average time deviation between para_server and para_audiod. */
110         struct timeval sa_time_diff;
111         /** Whether client time is ahead of server time. */
112         int sa_time_diff_sign;
113         /** The 'P' and the 'N' flags as announced by para_server. */
114         enum vss_status_flags vss_status;
115         /** Number of times the clock difference is to be checked. */
116         unsigned clock_diff_count;
117         /** When to start the next check for clock difference. */
118         struct timeval clock_diff_barrier;
119         /** Number of the audio format as announced by para_server. */
120         int current_audio_format_num;
121         /* The status task btrn is the child of the client task. */
122         struct btr_node *btrn;
123 };
124
125 /** The array of status items sent by para_server. */
126 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
127
128 /**
129  * the current mode of operation of which can be changed by the on/off/cycle
130  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
131  */
132 int audiod_status = AUDIOD_ON;
133
134 /**
135  * the gengetopt args_info struct that holds information on all command line
136  * arguments
137  */
138 struct audiod_args_info conf;
139
140 static char *socket_name;
141 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
142
143 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
144
145 static struct status_task status_task_struct;
146
147 /**
148  * the task that calls the status command of para_server
149  *
150  * \sa struct status_task
151  */
152 static struct status_task *stat_task = &status_task_struct;
153
154 /**
155  * the task for handling audiod commands
156  *
157  * \sa struct task, struct sched
158  */
159 struct command_task {
160         /** the local listening socket */
161         int fd;
162         /** the associated task structure */
163         struct task task;
164 };
165
166 /** iterate over all supported audio formats */
167 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
168
169 /**
170  * Get the audio format number.
171  *
172  * \param name The name of the audio format.
173  *
174  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
175  * \a name is not a supported audio format.
176  */
177 static int get_audio_format_num(const char *name)
178 {
179         int i;
180
181         while (para_isspace(*name))
182                 name++;
183         FOR_EACH_AUDIO_FORMAT(i)
184                 if (!strcmp(name, audio_formats[i]))
185                         return i;
186         return -E_UNSUPPORTED_AUDIO_FORMAT;
187 }
188
189 static int get_matching_audio_format_nums(const char *re)
190 {
191         int i, ret;
192         regex_t preg;
193
194         ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
195         if (ret < 0)
196                 return ret;
197         ret = 0;
198         FOR_EACH_AUDIO_FORMAT(i)
199                 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
200                         ret |= (1 << i);
201         regfree(&preg);
202         return ret;
203 }
204
205 /**
206  * Compute the play time based on information of the given slot.
207  *
208  * \param slot_num The slot number (negative means: no slot).
209  *
210  * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
211  * from the status items received from para_server and the start time of the
212  * (first) writer of the given slot.
213  *
214  * It has to to take into account that probably the stream was not started at
215  * the beginning of the file, that the clock between the server and the client
216  * host may differ and that playback of the stream was delayed, e.g. because
217  * the prebuffer filter is used in the filter configuration of the given slot.
218  *
219  * If no writer is active in the given slot, or \a slot_num is negative
220  * (indicating that para_audiod runs in standby mode), an approximation based
221  * only on the status items is computed and the returned string is prefixed
222  * with "~".
223  *
224  * \return A string that must be freed by the caller.
225  */
226 char *get_time_string(int slot_num)
227 {
228         int ret, seconds = 0, length;
229         struct timeval *tmp, sum, sss, /* server stream start */
230                 rstime, /* receiver start time */
231                 wstime, /* writer start time */
232                 wtime, /* now - writer start */
233                 rskip; /* receiver start - sss */
234         struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
235         char *msg;
236
237         if (audiod_status == AUDIOD_OFF)
238                 goto empty;
239         if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
240                 if (stat_task->length_seconds) /* paused */
241                         return NULL;
242                 goto empty; /* stopped */
243         }
244         if (audiod_status == AUDIOD_ON && !s)
245                 goto empty;
246         /*
247          * Valid status items and playing, set length and tmp to the stream
248          * start. We use the slot info and fall back to the info from current
249          * status items if no slot info is available.
250          */
251         length = stat_task->length_seconds;
252         tmp = &stat_task->server_stream_start;
253         if (s && s->wns && s->wns[0].btrn) { /* writer active in this slot */
254                 btr_get_node_start(s->wns[0].btrn, &wstime);
255                 if (wstime.tv_sec != 0) { /* writer wrote something */
256                         if (s->server_stream_start.tv_sec == 0) {
257                                 /* copy status info to slot */
258                                 s->server_stream_start = stat_task->server_stream_start;
259                                 s->offset_seconds = stat_task->offset_seconds;
260                                 s->seconds_total = stat_task->length_seconds;
261                         }
262                         length = s->seconds_total;
263                         tmp = &s->server_stream_start;
264                 }
265         }
266         if (stat_task->sa_time_diff_sign > 0)
267                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
268         else
269                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
270         if (!s || !s->wns || !s->wns[0].btrn) {
271                 struct timeval diff;
272                 tv_diff(now, &sss, &diff);
273                 seconds = diff.tv_sec + stat_task->offset_seconds;
274                 goto out;
275         }
276         tv_diff(now, &wstime, &wtime);
277         //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
278         seconds = s->offset_seconds;
279         if (s->receiver_node->btrn) {
280                 btr_get_node_start(s->receiver_node->btrn, &rstime);
281                 ret = tv_diff(&rstime, &sss, &rskip);
282                 if (ret > 0) { /* audiod was started in the middle of the stream */
283                         tv_add(&wtime, &rskip, &sum);
284                         seconds += sum.tv_sec;
285                 } else
286                         seconds += wtime.tv_sec;
287         } else
288                 seconds += wtime.tv_sec;
289 out:
290         seconds = PARA_MIN(seconds, length);
291         seconds = PARA_MAX(seconds, 0);
292         msg = make_message(
293                 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
294                 s? "" : "~",
295                 seconds / 60,
296                 seconds % 60,
297                 (length - seconds) / 60,
298                 (length - seconds) % 60,
299                 length? (seconds * 100 + length / 2) / length : 0,
300                 length / 60,
301                 length % 60
302         );
303         //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
304         return msg;
305 empty:
306         return para_strdup(NULL);
307 }
308
309 static int want_colors(void)
310 {
311         if (conf.color_arg == color_arg_no)
312                 return 0;
313         if (conf.color_arg == color_arg_yes)
314                 return 1;
315         if (conf.logfile_given)
316                 return 0;
317         return isatty(STDERR_FILENO);
318 }
319
320 static void parse_config_or_die(void)
321 {
322         int ret;
323         char *config_file;
324         struct audiod_cmdline_parser_params params = {
325                 .override = 0,
326                 .initialize = 0,
327                 .check_required = 1,
328                 .check_ambiguity = 0,
329                 .print_errors = 1
330         };
331
332         if (conf.config_file_given)
333                 config_file = para_strdup(conf.config_file_arg);
334         else {
335                 char *home = para_homedir();
336                 config_file = make_message("%s/.paraslash/audiod.conf", home);
337                 free(home);
338         }
339         ret = file_exists(config_file);
340         if (conf.config_file_given && !ret) {
341                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
342                 goto err;
343         }
344         if (ret)
345                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
346         free(config_file);
347         daemon_set_loglevel(conf.loglevel_arg);
348         return;
349 err:
350         free(config_file);
351         exit(EXIT_FAILURE);
352 }
353
354 static void setup_signal_handling(void)
355 {
356         sig_task->fd = para_signal_init();
357         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
358         para_install_sighandler(SIGINT);
359         para_install_sighandler(SIGTERM);
360         para_install_sighandler(SIGHUP);
361         para_sigaction(SIGPIPE, SIG_IGN);
362 }
363
364 static void clear_slot(int slot_num)
365 {
366         struct slot_info *s = &slot[slot_num];
367
368         PARA_INFO_LOG("clearing slot %d\n", slot_num);
369         memset(s, 0, sizeof(struct slot_info));
370         s->format = -1;
371 }
372
373 static void close_receiver(int slot_num)
374 {
375         struct slot_info *s = &slot[slot_num];
376         struct audio_format_info *a;
377
378         if (s->format < 0 || !s->receiver_node)
379                 return;
380         a = &afi[s->format];
381         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
382                 audio_formats[s->format], slot_num);
383         a->receiver->close(s->receiver_node);
384         btr_remove_node(&s->receiver_node->btrn);
385         free(s->receiver_node);
386         s->receiver_node = NULL;
387         tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
388                 &a->restart_barrier);
389 }
390
391 static void writer_cleanup(struct writer_node *wn)
392 {
393         struct writer *w;
394
395         if (!wn)
396                 return;
397         w = writers + wn->writer_num;
398         PARA_INFO_LOG("closing %s\n", writer_names[wn->writer_num]);
399         w->close(wn);
400         btr_remove_node(&wn->btrn);
401 }
402
403 static void close_writers(struct slot_info *s)
404 {
405         struct audio_format_info *a;
406         int i;
407
408         if (s->format < 0)
409                 return;
410         assert(s->wns);
411         a = afi + s->format;
412         if (a->num_writers == 0)
413                 writer_cleanup(s->wns);
414         else {
415                 for (i = 0; i < a->num_writers; i++)
416                         writer_cleanup(s->wns + i);
417         }
418         free(s->wns);
419         s->wns = NULL;
420 }
421
422 static void close_filters(struct slot_info *s)
423 {
424         int i;
425         struct audio_format_info *a = afi + s->format;
426         if (a->num_filters == 0)
427                 return;
428         for (i = 0; i < a->num_filters; i++) {
429                 struct filter_node *fn = s->fns + i;
430                 struct filter *f;
431
432                 if (!fn)
433                         continue;
434                 f = filters + fn->filter_num;
435                 if (f->close)
436                         f->close(fn);
437                 btr_remove_node(&fn->btrn);
438         }
439         free(s->fns);
440         s->fns = NULL;
441 }
442
443 /*
444  * Whenever a task commits suicide by returning from post_select with t->error
445  * < 0, it also removes its btr node. We do exactly that to kill a running
446  * task. Note that the scheduler checks t->error also _before_ each pre/post
447  * select call, so the victim will never be scheduled again.
448  */
449 static void kill_btrn(struct btr_node **btrnp, struct task *t, int error)
450 {
451         if (t->error < 0)
452                 return;
453         t->error = error;
454         btr_remove_node(btrnp);
455 }
456
457 static void notify_receivers(int error)
458 {
459         int i;
460
461         FOR_EACH_SLOT(i) {
462                 struct slot_info *s = slot + i;
463                 if (s->format < 0)
464                         continue;
465                 if (!s->receiver_node)
466                         continue;
467                 task_notify(&s->receiver_node->task, error);
468         }
469 }
470
471 static int get_empty_slot(void)
472 {
473         int i;
474         struct slot_info *s;
475
476         FOR_EACH_SLOT(i) {
477                 s = &slot[i];
478                 if (s->format < 0) {
479                         clear_slot(i);
480                         return i;
481                 }
482                 if (s->wns || s->receiver_node || s->fns)
483                         continue;
484                 clear_slot(i);
485                 return i;
486         }
487         return -E_NO_MORE_SLOTS;
488 }
489
490 static void open_filters(struct slot_info *s)
491 {
492         struct audio_format_info *a = afi + s->format;
493         struct filter_node *fn;
494         int nf = a->num_filters;
495         struct btr_node *parent;
496         int i;
497
498         if (nf == 0)
499                 return;
500         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
501         assert(s->fns == NULL);
502         s->fns = para_calloc(nf * sizeof(struct filter_node));
503         parent = s->receiver_node->btrn;
504         for (i = 0; i < nf; i++) {
505                 struct filter *f = filters + a->filter_nums[i];
506                 fn = s->fns + i;
507                 fn->filter_num = a->filter_nums[i];
508                 fn->conf = a->filter_conf[i];
509                 fn->task.pre_select = f->pre_select;
510                 fn->task.post_select = f->post_select;
511
512                 fn->btrn = btr_new_node(&(struct btr_node_description)
513                         EMBRACE(.name = f->name, .parent = parent,
514                                 .handler = f->execute, .context = fn));
515
516                 f->open(fn);
517                 register_task(&sched, &fn->task);
518                 parent = fn->btrn;
519                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
520                         audio_formats[s->format], i,  nf, f->name, (int)(s - slot));
521                 sprintf(fn->task.status, "%s (slot %d)", f->name, (int)(s - slot));
522         }
523 }
524
525 static void open_writers(struct slot_info *s)
526 {
527         int i;
528         struct audio_format_info *a = afi + s->format;
529         struct writer_node *wn;
530         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
531
532         assert(s->wns == NULL);
533         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
534                 * sizeof(struct writer_node));
535         PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
536         for (i = 0; i < a->num_writers; i++) {
537                 wn = s->wns + i;
538                 wn->conf = a->writer_conf[i];
539                 wn->writer_num = a->writer_nums[i];
540                 register_writer_node(wn, parent, &sched);
541         }
542 }
543
544 /* returns slot num on success */
545 static int open_receiver(int format)
546 {
547         struct audio_format_info *a = &afi[format];
548         struct slot_info *s;
549         int ret, slot_num;
550         struct receiver *r = a->receiver;
551         struct receiver_node *rn;
552
553         tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
554         ret = get_empty_slot();
555         if (ret < 0)
556                 return ret;
557         slot_num = ret;
558         rn = para_calloc(sizeof(*rn));
559         rn->receiver = r;
560         rn->conf = a->receiver_conf;
561         rn->btrn = btr_new_node(&(struct btr_node_description)
562                 EMBRACE(.name = r->name, .context = rn));
563         ret = r->open(rn);
564         if (ret < 0) {
565                 btr_remove_node(&rn->btrn);
566                 free(rn);
567                 return ret;
568         }
569         s = &slot[slot_num];
570         s->format = format;
571         s->receiver_node = rn;
572         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
573                 audio_formats[format], r->name, slot_num);
574         rn->task.pre_select = r->pre_select;
575         rn->task.post_select = r->post_select;
576         sprintf(rn->task.status, "%s receiver node", r->name);
577         register_task(&sched, &rn->task);
578         return slot_num;
579 }
580
581 static bool receiver_running(void)
582 {
583         int i;
584         long unsigned ss1 = stat_task->server_stream_start.tv_sec;
585
586         FOR_EACH_SLOT(i) {
587                 struct slot_info *s = &slot[i];
588                 long unsigned ss2 = s->server_stream_start.tv_sec;
589
590                 if (!s->receiver_node)
591                         continue;
592                 if (s->receiver_node->task.error >= 0)
593                         return true;
594                 if (ss1 == ss2)
595                         return true;
596         }
597         return false;
598 }
599
600 /**
601  * Return the root node of the current buffer tree.
602  *
603  * This is only used for stream grabbing.
604  *
605  * \return \p NULL if no slot is currently active. If more than one buffer tree
606  * exists, the node corresponding to the most recently started receiver is
607  * returned.
608  */
609 struct btr_node *audiod_get_btr_root(void)
610 {
611         int i, newest_slot = -1;
612         struct timeval newest_rstime = {0, 0};
613
614         FOR_EACH_SLOT(i) {
615                 struct slot_info *s = &slot[i];
616                 struct timeval rstime;
617                 if (!s->receiver_node)
618                         continue;
619                 if (s->receiver_node->task.error < 0)
620                         continue;
621                 btr_get_node_start(s->receiver_node->btrn, &rstime);
622                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
623                         continue;
624                 newest_rstime = rstime;
625                 newest_slot = i;
626         }
627         if (newest_slot == -1)
628                 return NULL;
629         return slot[newest_slot].receiver_node->btrn;
630 }
631
632 /* whether a new instance of a decoder should be started. */
633 static bool must_start_decoder(void)
634 {
635         int cafn = stat_task->current_audio_format_num;
636         unsigned vs = stat_task->vss_status;
637
638         if (audiod_status != AUDIOD_ON)
639                 return false;
640         if (cafn < 0)
641                 return false;
642         if (!stat_task->ct)
643                 return false;
644         if (vs & VSS_STATUS_FLAG_NEXT)
645                 return false;
646         if (!(vs & VSS_STATUS_FLAG_PLAYING))
647                 return false;
648         if (receiver_running())
649                 return false;
650         if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
651                 return false;
652         return true;
653 }
654
655 static unsigned compute_time_diff(const struct timeval *status_time)
656 {
657         struct timeval tmp, diff;
658         static unsigned count;
659         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
660         const struct timeval max_deviation = {0, 500 * 1000};
661         const int time_smooth = 5;
662
663         if (!status_time)
664                 return count;
665         sign = tv_diff(status_time, now, &diff);
666 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
667 //                      sign, sa_time_diff_sign);
668         if (!count) {
669                 sa_time_diff_sign = sign;
670                 stat_task->sa_time_diff = diff;
671                 count++;
672                 goto out;
673         }
674         if (count > 5) {
675                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
676                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
677                         PARA_WARNING_LOG("time diff jump: %lims\n",
678                                 s * tv2ms(&tmp));
679         }
680         count++;
681         sa_time_diff_sign = tv_convex_combination(
682                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
683                 count > 10? sign : sign * time_smooth, &diff,
684                 &tmp);
685         stat_task->sa_time_diff = tmp;
686         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
687                 sign < 0? "-" : "+",
688                 tv2ms(&diff),
689                 sa_time_diff_sign < 0? "-" : "+",
690                 tv2ms(&stat_task->sa_time_diff)
691         );
692 out:
693         stat_task->sa_time_diff_sign = sa_time_diff_sign;
694         return count;
695 }
696
697 static int update_item(int itemnum, char *buf)
698 {
699         long unsigned sec, usec;
700
701         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
702                 return 1;
703         free(stat_item_values[itemnum]);
704         stat_item_values[itemnum] = para_strdup(buf);
705         stat_client_write_item(itemnum);
706         switch (itemnum) {
707         case SI_STATUS_FLAGS:
708                 stat_task->vss_status = 0;
709                 if (strchr(buf, 'N'))
710                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
711                 if (strchr(buf, 'P'))
712                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
713                 break;
714         case SI_OFFSET:
715                 stat_task->offset_seconds = atoi(buf);
716                 break;
717         case SI_SECONDS_TOTAL:
718                 stat_task->length_seconds = atoi(buf);
719                 break;
720         case SI_STREAM_START:
721                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
722                         stat_task->server_stream_start.tv_sec = sec;
723                         stat_task->server_stream_start.tv_usec = usec;
724                 }
725                 break;
726         case SI_CURRENT_TIME:
727                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
728                         struct timeval tv = {sec, usec};
729                         compute_time_diff(&tv);
730                 }
731                 break;
732         case SI_FORMAT:
733                 stat_task->current_audio_format_num
734                         = get_audio_format_num(buf);
735         }
736         return 1;
737 }
738
739 static int parse_stream_command(const char *txt, char **cmd)
740 {
741         int ret, len;
742         char *re, *p = strchr(txt, ':');
743
744         if (!p)
745                 return -E_MISSING_COLON;
746         *cmd = p + 1;
747         len = p - txt;
748         re = malloc(len + 1);
749         strncpy(re, txt, len);
750         re[len] = '\0';
751         ret = get_matching_audio_format_nums(re);
752         free(re);
753         return ret;
754 }
755
756 static int add_filter(int format, char *cmdline)
757 {
758         struct audio_format_info *a = &afi[format];
759         int filter_num, nf = a->num_filters;
760         void *cfg;
761
762         filter_num = check_filter_arg(cmdline, &cfg);
763         if (filter_num < 0)
764                 return filter_num;
765         a->filter_conf = para_realloc(a->filter_conf,
766                 (nf + 1) * sizeof(void *));
767         a->filter_nums = para_realloc(a->filter_nums,
768                 (nf + 1) * sizeof(unsigned));
769         a->filter_nums[nf] = filter_num;
770         a->filter_conf[nf] = cfg;
771         a->num_filters++;
772         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
773                 filters[filter_num].name);
774         return filter_num;
775 }
776
777 static int parse_writer_args(void)
778 {
779         int i, ret;
780         char *cmd;
781         struct audio_format_info *a;
782
783         for (i = 0; i < conf.writer_given; i++) {
784                 void *wconf;
785                 int j, nw, writer_num, af_mask;
786
787                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
788                 if (ret < 0)
789                         return ret;
790                 af_mask = ret;
791                 FOR_EACH_AUDIO_FORMAT(j) {
792                         a = afi + j;
793                         if ((af_mask & (1 << j)) == 0) /* no match */
794                                 continue;
795                         wconf = check_writer_arg_or_die(cmd, &writer_num);
796                         nw = a->num_writers;
797                         a->writer_nums = para_realloc(a->writer_nums, (nw + 1) * sizeof(int));
798                         a->writer_conf = para_realloc(a->writer_conf, (nw + 1) * sizeof(void *));
799                         a->writer_nums[nw] = writer_num;
800                         a->writer_conf[nw] = wconf;
801                         PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
802                                 nw, writer_names[writer_num]);
803                         a->num_writers++;
804                 }
805         }
806         /* Use default writer for audio formats which are not yet set up. */
807         FOR_EACH_AUDIO_FORMAT(i) {
808                 void *writer_conf;
809                 int writer_num;
810                 a = afi + i;
811                 if (a->num_writers > 0)
812                         continue; /* already set up */
813                 writer_conf = check_writer_arg_or_die(NULL, &writer_num);
814                 a->writer_nums = para_malloc(sizeof(int));
815                 a->writer_nums[0] = writer_num;
816                 a->writer_conf = para_malloc(sizeof(void *));
817                 a->writer_conf[0] = writer_conf;
818                 a->num_writers = 1;
819                 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
820                         writer_names[writer_num]);
821         }
822         return 1;
823 }
824
825 static int parse_receiver_args(void)
826 {
827         int i, ret, receiver_num;
828         char *cmd = NULL;
829         struct audio_format_info *a;
830
831         for (i = conf.receiver_given - 1; i >= 0; i--) {
832                 char *arg;
833                 int j, af_mask;
834
835                 ret = parse_stream_command(conf.receiver_arg[i], &arg);
836                 if (ret < 0)
837                         goto out;
838                 af_mask = ret;
839                 FOR_EACH_AUDIO_FORMAT(j) {
840                         a = afi + j;
841                         if ((af_mask & (1 << j)) == 0) /* no match */
842                                 continue;
843                         /*
844                          * If multiple receivers are given for this audio format, the
845                          * last one wins and we have to free the previous receiver
846                          * config here. Since we are iterating backwards, the winning
847                          * receiver arg is in fact the first one given.
848                          */
849                         if (a->receiver_conf)
850                                 a->receiver->free_config(a->receiver_conf);
851                         a->receiver_conf = check_receiver_arg(arg, &receiver_num);
852                         ret = -E_RECV_SYNTAX;
853                         if (!a->receiver_conf)
854                                 goto out;
855                         a->receiver = receivers + receiver_num;
856                 }
857         }
858         /*
859          * Use the first available receiver with no arguments for those audio
860          * formats for which no receiver was specified.
861          */
862         cmd = para_strdup(receivers[0].name);
863         FOR_EACH_AUDIO_FORMAT(i) {
864                 a = &afi[i];
865                 if (a->receiver_conf)
866                         continue;
867                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
868                 if (!a->receiver_conf)
869                         return -E_RECV_SYNTAX;
870                 a->receiver = &receivers[receiver_num];
871         }
872         FOR_EACH_AUDIO_FORMAT(i) {
873                 a = afi + i;
874                 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
875                         audio_formats[i], a->receiver->name);
876         }
877         ret = 1;
878 out:
879         free(cmd);
880         return ret;
881 }
882
883 static int init_default_filters(void)
884 {
885         int i, ret = 1;
886
887         FOR_EACH_AUDIO_FORMAT(i) {
888                 struct audio_format_info *a = &afi[i];
889                 char *tmp;
890                 int j;
891
892                 if (a->num_filters)
893                         continue; /* no default -- nothing to to */
894                 /*
895                  * udp and dccp streams are fec-encoded, so add fecdec as the
896                  * first filter.
897                  */
898                 if (strcmp(afi[i].receiver->name, "udp") == 0 ||
899                                 strcmp(afi[i].receiver->name, "dccp") == 0) {
900                         tmp = para_strdup("fecdec");
901                         add_filter(i, tmp);
902                         free(tmp);
903                         if (ret < 0)
904                                 goto out;
905                 }
906                 /* add "dec" to audio format name */
907                 tmp = make_message("%sdec", audio_formats[i]);
908                 for (j = 0; filters[j].name; j++)
909                         if (!strcmp(tmp, filters[j].name))
910                                 break;
911                 free(tmp);
912                 ret = -E_UNSUPPORTED_FILTER;
913                 if (!filters[j].name)
914                         goto out;
915                 tmp = para_strdup(filters[j].name);
916                 ret = add_filter(i, tmp);
917                 free(tmp);
918                 if (ret < 0)
919                         goto out;
920                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
921                         filters[j].name);
922         }
923 out:
924         return ret;
925 }
926
927 static int parse_filter_args(void)
928 {
929         int i, j, ret, af_mask;
930
931         for (i = 0; i < conf.filter_given; i++) {
932                 char *arg;
933                 ret = parse_stream_command(conf.filter_arg[i], &arg);
934                 if (ret < 0)
935                         goto out;
936                 af_mask = ret;
937                 FOR_EACH_AUDIO_FORMAT(j) {
938                         if ((af_mask & (1 << j)) == 0) /* no match */
939                                 continue;
940                         ret = add_filter(j, arg);
941                         if (ret < 0)
942                                 goto out;
943                 }
944         }
945         ret = init_default_filters(); /* use default values for the rest */
946 out:
947         return ret;
948 }
949
950 static int parse_stream_args(void)
951 {
952         int ret;
953
954         ret = parse_receiver_args();
955         if (ret < 0)
956                 return ret;
957         ret = parse_filter_args();
958         if (ret < 0)
959                 return ret;
960         ret = parse_writer_args();
961         if (ret < 0)
962                 return ret;
963         return 1;
964 }
965
966 /* does not unlink socket on errors */
967 static int audiod_get_socket(void)
968 {
969         struct sockaddr_un unix_addr;
970         int ret, fd;
971
972         if (conf.socket_given)
973                 socket_name = para_strdup(conf.socket_arg);
974         else {
975                 char *hn = para_hostname();
976                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
977                         hn);
978                 free(hn);
979         }
980         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
981         if (conf.force_given)
982                 unlink(socket_name);
983         ret = create_local_socket(socket_name, &unix_addr,
984                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
985         if (ret < 0)
986                 goto err;
987         fd = ret;
988         if (listen(fd , 5) < 0) {
989                 ret = -ERRNO_TO_PARA_ERROR(errno);
990                 goto err;
991         }
992         ret = mark_fd_nonblocking(fd);
993         if (ret < 0)
994                 goto err;
995         return fd;
996 err:
997         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
998         exit(EXIT_FAILURE);
999 }
1000
1001 static void signal_pre_select(struct sched *s, struct task *t)
1002 {
1003         struct signal_task *st = container_of(t, struct signal_task, task);
1004         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1005 }
1006
1007 static void signal_post_select(struct sched *s, __a_unused struct task *t)
1008 {
1009         int signum;
1010
1011         signum = para_next_signal(&s->rfds);
1012         switch (signum) {
1013         case SIGINT:
1014         case SIGTERM:
1015         case SIGHUP:
1016                 PARA_EMERG_LOG("terminating on signal %d\n", signum);
1017                 clean_exit(EXIT_FAILURE, "caught deadly signal");
1018         }
1019 }
1020
1021 static void signal_setup_default(struct signal_task *st)
1022 {
1023         st->task.pre_select = signal_pre_select;
1024         st->task.post_select = signal_post_select;
1025         sprintf(st->task.status, "signal task");
1026 }
1027
1028 static void command_pre_select(struct sched *s, struct task *t)
1029 {
1030         struct command_task *ct = container_of(t, struct command_task, task);
1031         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
1032 }
1033
1034 static void command_post_select(struct sched *s, struct task *t)
1035 {
1036         int ret;
1037         struct command_task *ct = container_of(t, struct command_task, task);
1038         static struct timeval last_status_dump;
1039         struct timeval tmp, delay = {0, 500 * 1000};
1040
1041         tv_add(&last_status_dump, &delay, &tmp);
1042         if (tv_diff(&tmp, now, NULL) < 0) {
1043                 audiod_status_dump();
1044                 last_status_dump = *now;
1045         }
1046
1047         ret = handle_connect(ct->fd, &s->rfds);
1048         if (ret < 0)
1049                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1050         audiod_status_dump();
1051 }
1052
1053 static void init_command_task(struct command_task *ct)
1054 {
1055         ct->task.pre_select = command_pre_select;
1056         ct->task.post_select = command_post_select;
1057         ct->task.error = 0;
1058         ct->fd = audiod_get_socket(); /* doesn't return on errors */
1059         sprintf(ct->task.status, "command task");
1060 }
1061
1062 static void close_stat_pipe(void)
1063 {
1064         if (!stat_task->ct)
1065                 return;
1066         client_close(stat_task->ct);
1067         stat_task->ct = NULL;
1068         clear_and_dump_items();
1069         stat_task->length_seconds = 0;
1070         stat_task->offset_seconds = 0;
1071         stat_task->vss_status = 0;
1072         stat_task->current_audio_format_num = -1;
1073         audiod_status_dump();
1074 }
1075
1076 /**
1077  * close the connection to para_server and exit
1078  *
1079  * \param status the exit status which is passed to exit(3)
1080  * \param msg the log message
1081  *
1082  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1083  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1084  * EXIT_FAILURE.
1085  *
1086  * \sa exit(3)
1087  */
1088 void __noreturn clean_exit(int status, const char *msg)
1089 {
1090         PARA_EMERG_LOG("%s\n", msg);
1091         if (socket_name)
1092                 unlink(socket_name);
1093         close_stat_pipe();
1094         exit(status);
1095 }
1096
1097 /* avoid busy loop if server is down */
1098 static void set_stat_task_restart_barrier(unsigned seconds)
1099 {
1100         struct timeval delay = {seconds, 0};
1101         tv_add(now, &delay, &stat_task->restart_barrier);
1102 }
1103
1104 static void try_to_close_slot(int slot_num)
1105 {
1106         struct slot_info *s = &slot[slot_num];
1107         struct audio_format_info *a = afi + s->format;
1108         int i;
1109
1110         if (s->format < 0)
1111                 return;
1112         if (s->receiver_node && s->receiver_node->task.error >= 0)
1113                 return;
1114         for (i = 0; i < a->num_filters; i++)
1115                 if (s->fns && s->fns[i].task.error >= 0)
1116                         return;
1117         if (a->num_writers > 0) {
1118                 for (i = 0; i < a->num_writers; i++)
1119                         if (s->wns && s->wns[i].task.error >= 0)
1120                                 return;
1121         } else {
1122                 if (s->wns && s->wns[0].task.error >= 0)
1123                         return;
1124         }
1125         PARA_INFO_LOG("closing slot %d\n", slot_num);
1126         close_writers(s);
1127         close_filters(s);
1128         close_receiver(slot_num);
1129         clear_slot(slot_num);
1130 }
1131
1132 /*
1133  * Check if any receivers/filters/writers need to be started and do so if
1134  * necessary.
1135  */
1136 static void start_stop_decoders(void)
1137 {
1138         int i, ret;
1139         struct slot_info *sl;
1140         struct audio_format_info *a;
1141
1142         FOR_EACH_SLOT(i)
1143                 try_to_close_slot(i);
1144         if (audiod_status != AUDIOD_ON ||
1145                         !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1146                 return notify_receivers(E_NOT_PLAYING);
1147         if (!must_start_decoder())
1148                 return;
1149         ret = open_receiver(stat_task->current_audio_format_num);
1150         if (ret < 0) {
1151                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1152                 return;
1153         }
1154         sl = slot + ret;
1155         a = afi + sl->format;
1156         if (a->num_filters)
1157                 open_filters(sl);
1158         open_writers(sl);
1159         activate_grab_clients(&sched);
1160         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1161 }
1162
1163 static void status_pre_select(struct sched *s, struct task *t)
1164 {
1165         struct status_task *st = container_of(t, struct status_task, task);
1166         int ret, cafn = stat_task->current_audio_format_num;
1167
1168         if (must_start_decoder())
1169                 goto min_delay;
1170         ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1171         if (ret > 0)
1172                 goto min_delay;
1173         if (st->ct && audiod_status == AUDIOD_OFF)
1174                 goto min_delay;
1175         if (!st->ct && audiod_status != AUDIOD_OFF)
1176                 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1177         if (cafn >= 0)
1178                 sched_request_barrier(&afi[cafn].restart_barrier, s);
1179         /*
1180          * If para_server is playing we'd like to have a smooth time display
1181          * even if we are running in standby mode. So we request a timeout that
1182          * expires at the next full second.
1183          */
1184         if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1185                 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1186         return;
1187 min_delay:
1188         sched_min_delay(s);
1189 }
1190
1191 /* restart the client task if necessary */
1192 static void status_post_select(struct sched *s, struct task *t)
1193 {
1194         struct status_task *st = container_of(t, struct status_task, task);
1195
1196         if (audiod_status == AUDIOD_OFF) {
1197                 if (!st->ct)
1198                         goto out;
1199                 if (st->ct->task.error >= 0) {
1200                         kill_btrn(&st->ct->btrn, &st->ct->task, -E_AUDIOD_OFF);
1201                         goto out;
1202                 }
1203                 close_stat_pipe();
1204                 st->clock_diff_count = conf.clock_diff_count_arg;
1205                 goto out;
1206         }
1207         if (st->ct) {
1208                 char *buf;
1209                 size_t sz;
1210                 int ret;
1211                 if (st->ct->task.error < 0) {
1212                         close_stat_pipe();
1213                         goto out;
1214                 }
1215                 if (st->ct->status != CL_RECEIVING)
1216                         goto out;
1217                 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1218                 if (ret <= 0) {
1219                         struct timeval diff;
1220                         tv_diff(now, &st->last_status_read, &diff);
1221                         if (diff.tv_sec > 61)
1222                                 kill_btrn(&st->ct->btrn, &st->ct->task,
1223                                         -E_STATUS_TIMEOUT);
1224                         goto out;
1225                 }
1226                 btr_merge(st->btrn, st->min_iqs);
1227                 sz = btr_next_buffer(st->btrn, &buf);
1228                 ret = for_each_stat_item(buf, sz, update_item);
1229                 if (ret < 0) {
1230                         kill_btrn(&st->ct->btrn, &st->ct->task, ret);
1231                         goto out;
1232                 }
1233                 if (sz != ret) {
1234                         btr_consume(st->btrn, sz - ret);
1235                         st->last_status_read = *now;
1236                         st->min_iqs = 0;
1237                 } else /* current status item crosses buffers */
1238                         st->min_iqs = sz + 1;
1239                 goto out;
1240         }
1241         btr_drain(st->btrn);
1242         st->current_audio_format_num = -1;
1243         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1244                 goto out;
1245         if (st->clock_diff_count) { /* get status only one time */
1246                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1247                 int argc = 5;
1248                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1249                 st->clock_diff_count--;
1250                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1251                 set_stat_task_restart_barrier(2);
1252
1253         } else {
1254                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1255                 int argc = 4;
1256                 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1257                 set_stat_task_restart_barrier(5);
1258         }
1259         free(stat_item_values[SI_BASENAME]);
1260         stat_item_values[SI_BASENAME] = para_strdup(
1261                 "no connection to para_server");
1262         stat_client_write_item(SI_BASENAME);
1263         st->last_status_read = *now;
1264 out:
1265         start_stop_decoders();
1266 }
1267
1268 static void init_status_task(struct status_task *st)
1269 {
1270         memset(st, 0, sizeof(struct status_task));
1271         st->task.pre_select = status_pre_select;
1272         st->task.post_select = status_post_select;
1273         st->sa_time_diff_sign = 1;
1274         st->clock_diff_count = conf.clock_diff_count_arg;
1275         st->current_audio_format_num = -1;
1276         sprintf(st->task.status, "stat");
1277         st->btrn = btr_new_node(&(struct btr_node_description)
1278                 EMBRACE(.name = "stat"));
1279 }
1280
1281 static void set_initial_status(void)
1282 {
1283         audiod_status = AUDIOD_ON;
1284         if (!conf.mode_given)
1285                 return;
1286         if (!strcmp(conf.mode_arg, "sb")) {
1287                 audiod_status = AUDIOD_STANDBY;
1288                 return;
1289         }
1290         if (!strcmp(conf.mode_arg, "off")) {
1291                 audiod_status = AUDIOD_OFF;
1292                 return;
1293         }
1294         if (strcmp(conf.mode_arg, "on"))
1295                 PARA_WARNING_LOG("invalid mode\n");
1296 }
1297
1298 __noreturn static void print_help_and_die(void)
1299 {
1300         int d = conf.detailed_help_given;
1301         const char **p = d? audiod_args_info_detailed_help
1302                 : audiod_args_info_help;
1303
1304         printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1305                 AUDIOD_CMDLINE_PARSER_VERSION);
1306         printf_or_die("%s\n\n", audiod_args_info_usage);
1307         for (; *p; p++)
1308                 printf_or_die("%s\n", *p);
1309         print_receiver_helps(d);
1310         print_filter_helps(d);
1311         print_writer_helps(d);
1312         exit(0);
1313 }
1314
1315 static void init_colors_or_die(void)
1316 {
1317         int i;
1318
1319         if (!want_colors())
1320                 return;
1321         daemon_set_default_log_colors();
1322         daemon_set_flag(DF_COLOR_LOG);
1323         for (i = 0; i < conf.log_color_given; i++)
1324                 daemon_set_log_color_or_die(conf.log_color_arg[i]);
1325 }
1326
1327 /**
1328  * the main function of para_audiod
1329  *
1330  * \param argc usual argument count
1331  * \param argv usual argument vector
1332  *
1333  * \return EXIT_SUCCESS or EXIT_FAILURE
1334  *
1335  * \sa para_audiod(1)
1336  * */
1337 int main(int argc, char *argv[])
1338 {
1339         int ret, i;
1340         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1341         struct audiod_cmdline_parser_params params = {
1342                 .override = 0,
1343                 .initialize = 1,
1344                 .check_required = 0,
1345                 .check_ambiguity = 0,
1346                 .print_errors = 1
1347         };
1348
1349         valid_fd_012();
1350         if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1351                 exit(EXIT_FAILURE);
1352         HANDLE_VERSION_FLAG("audiod", conf);
1353         /* init receivers/filters/writers early to make help work */
1354         recv_init();
1355         filter_init();
1356         writer_init();
1357         if (conf.help_given || conf.detailed_help_given)
1358                 print_help_and_die();
1359         drop_privileges_or_die(conf.user_arg, conf.group_arg);
1360         parse_config_or_die();
1361         init_colors_or_die();
1362         init_random_seed_or_die();
1363         daemon_set_flag(DF_LOG_TIME);
1364         daemon_set_flag(DF_LOG_HOSTNAME);
1365         daemon_set_flag(DF_LOG_LL);
1366         if (conf.log_timing_given)
1367                 daemon_set_flag(DF_LOG_TIMING);
1368         if (conf.logfile_given) {
1369                 daemon_set_logfile(conf.logfile_arg);
1370                 daemon_open_log_or_die();
1371         }
1372         ret = parse_stream_args();
1373         if (ret < 0) {
1374                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1375                 exit(EXIT_FAILURE);
1376         }
1377         log_welcome("para_audiod");
1378         set_server_start_time(NULL);
1379         set_initial_status();
1380         FOR_EACH_SLOT(i)
1381                 clear_slot(i);
1382         setup_signal_handling();
1383         signal_setup_default(sig_task);
1384
1385         init_status_task(stat_task);
1386         init_command_task(cmd_task);
1387
1388         if (conf.daemon_given)
1389                 daemonize(false /* parent exits immediately */);
1390
1391         register_task(&sched, &sig_task->task);
1392         register_task(&sched, &cmd_task->task);
1393         register_task(&sched, &stat_task->task);
1394         sched.default_timeout.tv_sec = 2;
1395         sched.default_timeout.tv_usec = 999 * 1000;
1396         ret = schedule(&sched);
1397
1398         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1399         return EXIT_FAILURE;
1400 }