audiod: Timing fixes.
[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 <regex.h>
9 #include <sys/types.h>
10 #include <dirent.h>
11 #include <signal.h>
12 #include <openssl/rc4.h>
13 #include <stdbool.h>
14
15 #include "para.h"
16 #include "error.h"
17 #include "crypt.h"
18 #include "audiod.cmdline.h"
19 #include "list.h"
20 #include "sched.h"
21 #include "ggo.h"
22 #include "recv.h"
23 #include "buffer_tree.h"
24 #include "filter.h"
25 #include "grab_client.h"
26 #include "client.cmdline.h"
27 #include "client.h"
28 #include "audiod.h"
29 #include "net.h"
30 #include "daemon.h"
31 #include "string.h"
32 #include "fd.h"
33 #include "write.h"
34 #include "write_common.h"
35 #include "signal.h"
36
37 /** define the array of error lists needed by para_audiod */
38 INIT_AUDIOD_ERRLISTS;
39 /** define the array containing all supported audio formats */
40 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
41
42 /** Defines how audiod handles one supported audio format. */
43 struct audio_format_info {
44         /** pointer to the receiver for this audio format */
45         struct receiver *receiver;
46         /** the receiver configuration */
47         void *receiver_conf;
48         /** the number of filters that should be activated for this audio format */
49         unsigned int num_filters;
50         /** Array of filter numbers to be activated. */
51         unsigned *filter_nums;
52         /** Pointer to the array of filter configurations. */
53         void **filter_conf;
54         /** the number of filters that should be activated for this audio format */
55         unsigned int num_writers;
56         /** Array of writer numbers to be activated. */
57         int *writer_nums;
58         /** pointer to the array of writer configurations */
59         void **writer_conf;
60         /** do not start receiver/filters/writer before this time */
61         struct timeval restart_barrier;
62 };
63
64 /**
65  * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
66  * be associated with a receiver/filter/writer triple. This array holds all
67  * information on the status of these slots.
68  *
69  * \sa struct slot_info
70  * */
71 struct slot_info slot[MAX_STREAM_SLOTS];
72
73 /** The vss status flags audiod is interested in. */
74 enum vss_status_flags {
75         /** Whether the 'N' flag is set. */
76         VSS_STATUS_FLAG_NEXT = 1,
77         /** The 'P' flag is set. */
78         VSS_STATUS_FLAG_PLAYING = 2,
79 };
80
81 /**
82  * The task for obtaining para_server's status (para_client stat).
83  *
84  * \sa struct task, struct sched.
85  */
86 struct status_task {
87         /** The associated task structure of audiod. */
88         struct task task;
89         /** Client data associated with the stat task. */
90         struct client_task *ct;
91         /** Do not restart client command until this time. */
92         struct timeval restart_barrier;
93         /** Last time we received status data from para_server. */
94         struct timeval last_status_read;
95         /** The offset value announced by para_server. */
96         int offset_seconds;
97         /** The length of the current audio file as announced by para_server. */
98         int length_seconds;
99         /** The start of the current stream from the view of para_server. */
100         struct timeval server_stream_start;
101         /** The average time deviation between para_server and para_audiod. */
102         struct timeval sa_time_diff;
103         /** Whether client time is ahead of server time. */
104         int sa_time_diff_sign;
105         /** The 'P' and the 'N' flags as announced by para_server. */
106         enum vss_status_flags vss_status;
107         /** Number of times the clock difference is to be checked. */
108         unsigned clock_diff_count;
109         /** When to start the next check for clock difference. */
110         struct timeval clock_diff_barrier;
111         /** Number of the audio format as announced by para_server. */
112         int current_audio_format_num;
113 };
114
115 /** The array of status items sent by para_server. */
116 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
117
118 /**
119  * the current mode of operation of which can be changed by the on/off/cycle
120  * commands. It is either, AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY.
121  */
122 int audiod_status = AUDIOD_ON;
123
124 /**
125  * the gengetopt args_info struct that holds information on all command line
126  * arguments
127  */
128 struct audiod_args_info conf;
129
130 static char *socket_name;
131 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
132
133 static struct signal_task signal_task_struct, *sig_task = &signal_task_struct;
134
135 static struct status_task status_task_struct;
136
137 /**
138  * the task that calls the status command of para_server
139  *
140  * \sa struct status_task
141  */
142 static struct status_task *stat_task = &status_task_struct;
143 static struct timeval initial_delay_barrier;
144
145 /**
146  * the task for handling audiod commands
147  *
148  * \sa struct task, struct sched
149  */
150 struct command_task {
151         /** the local listening socket */
152         int fd;
153         /** the associated task structure */
154         struct task task;
155 };
156
157 /** iterate over all supported audio formats */
158 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
159
160 /**
161  * get the audio format number
162  * \param name the name of the audio format
163  *
164  * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
165  * \a name is not a supported audio format.
166  */
167 int get_audio_format_num(const char *name)
168 {
169         int i;
170
171         while (para_isspace(*name))
172                 name++;
173         FOR_EACH_AUDIO_FORMAT(i)
174                 if (!strcmp(name, audio_formats[i]))
175                         return i;
176         return -E_UNSUPPORTED_AUDIO_FORMAT;
177 }
178
179 char *get_time_string(int slot_num)
180 {
181         int ret, seconds = 0, length;
182         struct timeval *tmp, sum, sss, /* server stream start */
183                 rstime, /* receiver start time */
184                 wstime, /* writer start time */
185                 wtime, /* now - writer start */
186                 rskip; /* receiver start - sss */
187         struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
188         char *msg;
189
190         if (audiod_status == AUDIOD_OFF)
191                 goto empty;
192         if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)) {
193                 if (stat_task->length_seconds) /* paused */
194                         return NULL;
195                 goto empty; /* stopped */
196         }
197         if (audiod_status == AUDIOD_ON && !s)
198                 goto empty;
199         /* valid status items and playing */
200         if (s && s->wns) { /* writer active in this slot */
201                 length = s->seconds_total;
202                 tmp = &s->server_stream_start;
203         } else { /* standby mode, rely on status items */
204                 length = stat_task->length_seconds;
205                 tmp = &stat_task->server_stream_start;
206         }
207         if (stat_task->sa_time_diff_sign > 0)
208                 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
209         else
210                 tv_add(tmp, &stat_task->sa_time_diff, &sss);
211         if (!s || !s->wns) {
212                 struct timeval diff;
213                 tv_diff(now, &sss, &diff);
214                 seconds = diff.tv_sec + stat_task->offset_seconds;
215                 goto out;
216         }
217         btr_get_node_start(s->wns[0].btrn, &wstime);
218         tv_diff(now, &wstime, &wtime);
219         //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
220         seconds = s->offset_seconds;
221         btr_get_node_start(s->receiver_node->btrn, &rstime);
222         ret = tv_diff(&rstime, &sss, &rskip);
223         if (ret > 0) { /* audiod was started in the middle of the stream */
224                 tv_add(&wtime, &rskip, &sum);
225                 seconds += sum.tv_sec;
226         } else
227                 seconds += wtime.tv_sec;
228 out:
229         seconds = PARA_MIN(seconds, length);
230         seconds = PARA_MAX(seconds, 0);
231         msg = make_message(
232                 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
233                 s? "" : "~",
234                 seconds / 60,
235                 seconds % 60,
236                 (length - seconds) / 60,
237                 (length - seconds) % 60,
238                 length? (seconds * 100 + length / 2) / length : 0,
239                 length / 60,
240                 length % 60
241         );
242         PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
243         return msg;
244 empty:
245         return para_strdup(NULL);
246 }
247
248 static int want_colors(void)
249 {
250         if (conf.color_arg == color_arg_no)
251                 return 0;
252         if (conf.color_arg == color_arg_yes)
253                 return 1;
254         if (conf.logfile_given)
255                 return 0;
256         return isatty(STDERR_FILENO);
257 }
258
259 static void parse_config_or_die(void)
260 {
261         int ret;
262         char *config_file;
263         struct audiod_cmdline_parser_params params = {
264                 .override = 0,
265                 .initialize = 0,
266                 .check_required = 1,
267                 .check_ambiguity = 0,
268                 .print_errors = 1
269         };
270
271         if (conf.config_file_given)
272                 config_file = para_strdup(conf.config_file_arg);
273         else {
274                 char *home = para_homedir();
275                 config_file = make_message("%s/.paraslash/audiod.conf", home);
276                 free(home);
277         }
278         ret = file_exists(config_file);
279         if (conf.config_file_given && !ret) {
280                 PARA_EMERG_LOG("can not read config file %s\n", config_file);
281                 goto err;
282         }
283         if (ret)
284                 audiod_cmdline_parser_config_file(config_file, &conf, &params);
285         free(config_file);
286         daemon_set_loglevel(conf.loglevel_arg);
287         return;
288 err:
289         free(config_file);
290         exit(EXIT_FAILURE);
291 }
292
293 static void setup_signal_handling(void)
294 {
295         sig_task->fd = para_signal_init();
296         PARA_INFO_LOG("signal pipe: fd %d\n", sig_task->fd);
297         para_install_sighandler(SIGINT);
298         para_install_sighandler(SIGTERM);
299         para_install_sighandler(SIGHUP);
300         para_sigaction(SIGPIPE, SIG_IGN);
301 }
302
303 static void clear_slot(int slot_num)
304 {
305         struct slot_info *s = &slot[slot_num];
306
307         PARA_INFO_LOG("clearing slot %d\n", slot_num);
308         memset(s, 0, sizeof(struct slot_info));
309         s->format = -1;
310 }
311
312 static void close_receiver(int slot_num)
313 {
314         struct slot_info *s = &slot[slot_num];
315         struct audio_format_info *a;
316         struct timeval restart_delay = {0, 200 * 1000};
317
318         if (s->format < 0 || !s->receiver_node)
319                 return;
320         a = &afi[s->format];
321         PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
322                 audio_formats[s->format], slot_num);
323         a->receiver->close(s->receiver_node);
324         btr_free_node(s->receiver_node->btrn);
325         free(s->receiver_node);
326         s->receiver_node = NULL;
327         tv_add(now, &restart_delay, &afi[s->format].restart_barrier);
328 }
329
330 static void writer_cleanup(struct writer_node *wn)
331 {
332         struct writer *w = writers + wn->writer_num;
333
334         w->close(wn);
335         btr_free_node(wn->btrn);
336 }
337
338 static void close_writers(struct slot_info *s)
339 {
340         struct audio_format_info *a;
341         int i;
342
343         if (s->format < 0)
344                 return;
345         a = afi + s->format;
346         if (a->num_writers == 0)
347                 writer_cleanup(s->wns);
348         else {
349                 for (i = 0; i < a->num_writers; i++)
350                         writer_cleanup(s->wns + i);
351         }
352         free(s->wns);
353         s->wns = NULL;
354 }
355
356 static void _close_filters(struct slot_info *s)
357 {
358         int i;
359         struct audio_format_info *a = afi + s->format;
360         if (a->num_filters == 0)
361                 return;
362         for (i = 0; i < a->num_filters; i++) {
363                 struct filter_node *fn = s->fns + i;
364                 struct filter *f = filters + fn->filter_num;
365
366                 f->close(fn);
367                 btr_free_node(fn->btrn);
368         }
369         free(s->fns);
370         s->fns = NULL;
371 }
372
373 static void kill_all_decoders(int error)
374 {
375         int i, j;
376
377         FOR_EACH_SLOT(i) {
378                 struct slot_info *s = &slot[i];
379                 struct audio_format_info *a;
380                 if (s->format < 0)
381                         continue;
382                 a = afi + s->format;
383                 if (s->wns)
384                         for (j = 0; j < a->num_writers; j++)
385                                 s->wns[j].task.error = error;
386                 if (s->fns)
387                         for (j = 0; j < a->num_writers; j++)
388                                 s->fns[j].task.error = error;
389                 if (s->receiver_node)
390                         s->receiver_node->task.error = error;
391         }
392 }
393
394 static int get_empty_slot(void)
395 {
396         int i;
397         struct slot_info *s;
398
399         FOR_EACH_SLOT(i) {
400                 s = &slot[i];
401                 if (s->format < 0) {
402                         clear_slot(i);
403                         return i;
404                 }
405                 if (s->wns || s->receiver_node || s->fns)
406                         continue;
407                 clear_slot(i);
408                 return i;
409         }
410         return -E_NO_MORE_SLOTS;
411 }
412
413 /**
414  * get the number of filters
415  *
416  * \param audio_format_num the number identifying the audio format
417  *
418  * \return the number of filters for the given audio format
419  *
420  * \sa struct filter;
421  */
422 int num_filters(int audio_format_num)
423 {
424         return afi[audio_format_num].num_filters;
425 }
426
427 static void open_filters(struct slot_info *s)
428 {
429         struct audio_format_info *a = afi + s->format;
430         struct filter_node *fn;
431         int nf = a->num_filters;
432         struct btr_node *parent;
433         int i;
434
435         if (nf == 0)
436                 return;
437         PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
438         assert(s->fns == NULL);
439         s->fns = para_calloc(nf * sizeof(struct filter_node));
440         parent = s->receiver_node->btrn;
441         for (i = 0; i < nf; i++) {
442                 struct filter *f = filters + a->filter_nums[i];
443                 fn = s->fns + i;
444                 fn->filter_num = a->filter_nums[i];
445                 fn->conf = a->filter_conf[i];
446                 fn->task.pre_select = f->pre_select;
447                 fn->task.post_select = f->post_select;
448                 fn->btrn = btr_new_node(f->name, parent, f->execute, fn);
449                 f->open(fn);
450                 register_task(&fn->task);
451                 parent = fn->btrn;
452                 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
453                         audio_formats[s->format], i,  nf, f->name, s - slot);
454                 sprintf(fn->task.status, "%s (slot %d)", f->name, s - slot);
455         }
456 }
457
458 static void open_writers(struct slot_info *s)
459 {
460         int i;
461         struct audio_format_info *a = afi + s->format;
462         struct writer_node *wn;
463         struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
464
465         assert(s->wns == NULL);
466         s->wns = para_calloc(PARA_MAX(1U, a->num_writers)
467                 * sizeof(struct writer_node));
468         if (a->num_writers == 0)
469                 setup_writer_node(NULL, parent, s->wns);
470         else {
471                 PARA_INFO_LOG("opening %s writers\n", audio_formats[s->format]);
472                 for (i = 0; i < a->num_writers; i++) {
473                         wn = s->wns + i;
474                         wn->conf = a->writer_conf[i];
475                         wn->writer_num = a->writer_nums[i];
476                         register_writer_node(wn, parent);
477                 }
478         }
479         s->server_stream_start = stat_task->server_stream_start.tv_sec?
480                 stat_task->server_stream_start : *now;
481         s->offset_seconds = stat_task->offset_seconds;
482         s->seconds_total = stat_task->length_seconds;
483 }
484
485 /* returns slot num on success */
486 static int open_receiver(int format)
487 {
488         struct audio_format_info *a = &afi[format];
489         struct slot_info *s;
490         int ret, slot_num;
491         struct receiver *r = a->receiver;
492         struct receiver_node *rn;
493         const struct timeval restart_delay = {2, 0};
494
495         ret = get_empty_slot();
496         if (ret < 0)
497                 goto err;
498         slot_num = ret;
499         s = &slot[slot_num];
500         s->format = format;
501         s->receiver_node = para_calloc(sizeof(struct receiver_node));
502         rn = s->receiver_node;
503         rn->receiver = r;
504         rn->conf = a->receiver_conf;
505         rn->btrn = btr_new_node(r->name, NULL, NULL, rn);
506         ret = r->open(rn);
507         if (ret < 0) {
508                 btr_free_node(rn->btrn);
509                 free(rn);
510                 s->receiver_node = NULL;
511                 goto err;
512         }
513         PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
514                 audio_formats[s->format], r->name, slot_num);
515         rn->task.pre_select = r->pre_select;
516         rn->task.post_select = r->post_select;
517         sprintf(rn->task.status, "%s receiver node", r->name);
518         register_task(&rn->task);
519         ret = slot_num;
520 err:
521         if (ret < 0)
522                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
523         tv_add(now, &restart_delay, &afi[format].restart_barrier);
524         return ret;
525 }
526
527 /* return: 0: Not running, 1: Running, -1: Running but eof (or error) */
528 static int receiver_running(int format)
529 {
530         int i, ret = 0;
531
532         FOR_EACH_SLOT(i) {
533                 struct slot_info *s = &slot[i];
534                 if (s->format != format)
535                         continue;
536                 if (!s->receiver_node)
537                         continue;
538                 if (s->receiver_node->task.error >= 0)
539                         return 1;
540                 ret = -1;
541         }
542         return ret;
543 }
544
545 struct btr_node *audiod_get_btr_root(void)
546 {
547         int i, newest_slot = -1;
548         struct timeval newest_rstime = {0, 0};
549
550         FOR_EACH_SLOT(i) {
551                 struct slot_info *s = &slot[i];
552                 struct timeval rstime;
553                 if (!s->receiver_node)
554                         continue;
555                 if (s->receiver_node->task.error < 0)
556                         continue;
557                 btr_get_node_start(s->receiver_node->btrn, &rstime);
558                 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
559                         continue;
560                 newest_rstime = rstime;
561                 newest_slot = i;
562         }
563         if (newest_slot == -1)
564                 return NULL;
565         return slot[newest_slot].receiver_node->btrn;
566 }
567
568 /* returns slot num on success. */
569 static int open_current_receiver(struct sched *s)
570 {
571         struct timeval diff;
572         int ret, cafn = stat_task->current_audio_format_num;
573
574         if (cafn < 0 || !stat_task->ct)
575                 return -1;
576         /* Do nothing if the 'N' flag is set or the 'P' flag is unset */
577         if (stat_task->vss_status != VSS_STATUS_FLAG_PLAYING)
578                 return -1;
579         ret = receiver_running(cafn);
580         if (ret > 0) /* already running and not eof */
581                 return -1;
582         if (ret < 0) { /* eof */
583                 /*
584                  * para_server uses a zero start time during the announcement
585                  * period, i.e. before it sends the first chunk. Wait until
586                  * this period begins to avoid restarting the receiver that
587                  * belongs to the file just completed.
588                  */
589                 if (stat_task->server_stream_start.tv_sec != 0)
590                         sched_request_timeout_ms(100, s);
591         }
592         if (tv_diff(now, &afi[cafn].restart_barrier, &diff) < 0) {
593                 if (tv_diff(&s->timeout, &diff, NULL) > 0)
594                         s->timeout = diff;
595                 else
596                         sched_min_delay(s);
597                 return -1;
598         }
599         /* start a new receiver */
600         return open_receiver(cafn);
601 }
602
603 static unsigned compute_time_diff(const struct timeval *status_time)
604 {
605         struct timeval tmp, diff;
606         static unsigned count;
607         int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
608         const struct timeval max_deviation = {0, 500 * 1000};
609         const int time_smooth = 5;
610
611         if (!status_time)
612                 return count;
613         sign = tv_diff(status_time, now, &diff);
614 //              PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
615 //                      sign, sa_time_diff_sign);
616         if (!count) {
617                 sa_time_diff_sign = sign;
618                 stat_task->sa_time_diff = diff;
619                 count++;
620                 goto out;
621         }
622         if (count > 5) {
623                 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
624                 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
625                         PARA_WARNING_LOG("time diff jump: %lims\n",
626                                 s * tv2ms(&tmp));
627         }
628         count++;
629         sa_time_diff_sign = tv_convex_combination(
630                 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
631                 count > 10? sign : sign * time_smooth, &diff,
632                 &tmp);
633         stat_task->sa_time_diff = tmp;
634         PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
635                 sign > 0? "+" : "-",
636                 tv2ms(&diff),
637                 sa_time_diff_sign ? "+" : "-",
638                 tv2ms(&stat_task->sa_time_diff)
639         );
640 out:
641         stat_task->sa_time_diff_sign = sa_time_diff_sign;
642         return count;
643 }
644
645 static int update_item(int itemnum, char *buf)
646 {
647         long unsigned sec, usec;
648
649         if (stat_task->clock_diff_count && itemnum != SI_CURRENT_TIME)
650                 return 1;
651         free(stat_item_values[itemnum]);
652         stat_item_values[itemnum] = para_strdup(buf);
653         stat_client_write_item(itemnum);
654         switch (itemnum) {
655         case SI_STATUS_FLAGS:
656                 stat_task->vss_status = 0;
657                 if (strchr(buf, 'N'))
658                         stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
659                 if (strchr(buf, 'P'))
660                         stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
661                 break;
662         case SI_OFFSET:
663                 stat_task->offset_seconds = atoi(buf);
664                 break;
665         case SI_SECONDS_TOTAL:
666                 stat_task->length_seconds = atoi(buf);
667                 break;
668         case SI_STREAM_START:
669                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
670                         struct timeval a_start, delay;
671                         delay.tv_sec = conf.stream_delay_arg / 1000;
672                         delay.tv_usec = (conf.stream_delay_arg % 1000) * 1000;
673                         stat_task->server_stream_start.tv_sec = sec;
674                         stat_task->server_stream_start.tv_usec = usec;
675                         if (compute_time_diff(NULL) > 2) {
676                                 if (stat_task->sa_time_diff_sign < 0)
677                                         tv_add(&stat_task->server_stream_start,
678                                                 &stat_task->sa_time_diff, &a_start);
679                                 else
680                                         tv_diff(&stat_task->server_stream_start,
681                                                 &stat_task->sa_time_diff, &a_start);
682                                 tv_add(&a_start, &delay, &initial_delay_barrier);
683                         }
684                 }
685                 break;
686         case SI_CURRENT_TIME:
687                 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
688                         struct timeval tv = {sec, usec};
689                         compute_time_diff(&tv);
690                 }
691                 break;
692         case SI_FORMAT:
693                 stat_task->current_audio_format_num
694                         = get_audio_format_num(buf);
695         }
696         return 1;
697 }
698
699 static int parse_stream_command(const char *txt, char **cmd)
700 {
701         char *p = strchr(txt, ':');
702         int i;
703
704         if (!p)
705                 return -E_MISSING_COLON;
706         p++;
707         FOR_EACH_AUDIO_FORMAT(i) {
708                 if (strncmp(txt, audio_formats[i], strlen(audio_formats[i])))
709                         continue;
710                 *cmd = p;
711                 return i;
712         }
713         return -E_UNSUPPORTED_AUDIO_FORMAT;
714 }
715
716 static int add_filter(int format, char *cmdline)
717 {
718         struct audio_format_info *a = &afi[format];
719         int filter_num, nf = a->num_filters;
720
721         filter_num = check_filter_arg(cmdline, &a->filter_conf[nf]);
722         if (filter_num < 0)
723                 return filter_num;
724         a->filter_nums[nf] = filter_num;
725         a->num_filters++;
726         PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
727                 filters[filter_num].name);
728         return filter_num;
729 }
730
731 static int parse_writer_args(void)
732 {
733         int i, ret, nw;
734         char *cmd;
735         struct audio_format_info *a;
736
737         nw = PARA_MAX(1U, conf.writer_given);
738         PARA_INFO_LOG("maximal number of writers: %d\n", nw);
739         FOR_EACH_AUDIO_FORMAT(i) {
740                 a = &afi[i];
741                 a->writer_conf = para_malloc(nw * sizeof(void *));
742                 a->writer_nums = para_malloc(nw * sizeof(int));
743                 a->num_writers = 0;
744         }
745         for (i = 0; i < conf.writer_given; i++) {
746                 void *wconf;
747                 int writer_num;
748                 ret = parse_stream_command(conf.writer_arg[i], &cmd);
749                 if (ret < 0)
750                         goto out;
751                 a = &afi[ret];
752                 nw = a->num_writers;
753                 wconf = check_writer_arg(cmd, &writer_num);
754                 if (!wconf) {
755                         ret = writer_num;
756                         goto out;
757                 }
758                 a->writer_nums[nw] = writer_num;
759                 a->writer_conf[nw] = wconf;
760                 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[ret],
761                         nw, writer_names[writer_num]);
762                 a->num_writers++;
763         }
764         ret = 1;
765 out:
766         return ret;
767 }
768
769 static int parse_receiver_args(void)
770 {
771         int i, ret, receiver_num;
772         char *cmd = NULL;
773         struct audio_format_info *a;
774
775         for (i = conf.receiver_given - 1; i >= 0; i--) {
776                 char *arg = conf.receiver_arg[i];
777                 char *recv_arg = strchr(arg, ':');
778                 ret = -E_MISSING_COLON;
779                 if (!recv_arg)
780                         goto out;
781                 *recv_arg = '\0';
782                 recv_arg++;
783                 ret = get_audio_format_num(arg);
784                 if (ret < 0)
785                         goto out;
786                 afi[ret].receiver_conf = check_receiver_arg(recv_arg, &receiver_num);
787                 if (!afi[ret].receiver_conf) {
788                         ret = -E_RECV_SYNTAX;
789                         goto out;
790                 }
791                 afi[ret].receiver = &receivers[receiver_num];
792         }
793         /* use the first available receiver with no arguments
794          * for those audio formats for which no receiver
795          * was specified
796          */
797         cmd = para_strdup(receivers[0].name);
798         FOR_EACH_AUDIO_FORMAT(i) {
799                 a = &afi[i];
800                 if (a->receiver_conf)
801                         continue;
802                 a->receiver_conf = check_receiver_arg(cmd, &receiver_num);
803                 if (!a->receiver_conf)
804                         return -E_RECV_SYNTAX;
805                 a->receiver = &receivers[receiver_num];
806         }
807         ret = 1;
808 out:
809         free(cmd);
810         return ret;
811 }
812
813 static int init_default_filters(void)
814 {
815         int i, ret = 1;
816
817         FOR_EACH_AUDIO_FORMAT(i) {
818                 struct audio_format_info *a = &afi[i];
819                 char *tmp;
820                 int j;
821
822                 if (a->num_filters)
823                         continue; /* no default -- nothing to to */
824                 /* add "dec" to audio format name */
825                 tmp = make_message("%sdec", audio_formats[i]);
826                 for (j = 0; filters[j].name; j++)
827                         if (!strcmp(tmp, filters[j].name))
828                                 break;
829                 free(tmp);
830                 ret = -E_UNSUPPORTED_FILTER;
831                 if (!filters[j].name)
832                         goto out;
833                 tmp = para_strdup(filters[j].name);
834                 ret = add_filter(i, tmp);
835                 free(tmp);
836                 if (ret < 0)
837                         goto out;
838                 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
839                         filters[j].name);
840         }
841 out:
842         return ret;
843 }
844
845 static int parse_filter_args(void)
846 {
847         int i, ret, nf;
848
849         nf = PARA_MAX(1U, conf.filter_given);
850         PARA_INFO_LOG("maximal number of filters: %d\n", nf);
851         FOR_EACH_AUDIO_FORMAT(i) {
852                 afi[i].filter_conf = para_malloc(nf * sizeof(void *));
853                 afi[i].filter_nums = para_malloc(nf * sizeof(unsigned));
854         }
855         if (!conf.no_default_filters_given)
856                 return init_default_filters();
857         for (i = 0; i < conf.filter_given; i++) {
858                 char *arg = conf.filter_arg[i];
859                 char *filter_name = strchr(arg, ':');
860                 ret = -E_MISSING_COLON;
861                 if (!filter_name)
862                         goto out;
863                 *filter_name = '\0';
864                 filter_name++;
865                 ret = get_audio_format_num(arg);
866                 if (ret < 0)
867                         goto out;
868                 ret = add_filter(ret, filter_name);
869                 if (ret < 0)
870                         goto out;
871         }
872         ret = init_default_filters(); /* use default values for the rest */
873 out:
874         return ret;
875 }
876
877 static int parse_stream_args(void)
878 {
879         int ret;
880
881         ret = parse_receiver_args();
882         if (ret < 0)
883                 return ret;
884         ret = parse_filter_args();
885         if (ret < 0)
886                 return ret;
887         ret = parse_writer_args();
888         if (ret < 0)
889                 return ret;
890         return 1;
891 }
892
893 /* does not unlink socket on errors */
894 static int audiod_get_socket(void)
895 {
896         struct sockaddr_un unix_addr;
897         int ret, fd;
898
899         if (conf.socket_given)
900                 socket_name = para_strdup(conf.socket_arg);
901         else {
902                 char *hn = para_hostname();
903                 socket_name = make_message("/var/paraslash/audiod_socket.%s",
904                         hn);
905                 free(hn);
906         }
907         PARA_NOTICE_LOG("local socket: %s\n", socket_name);
908         if (conf.force_given)
909                 unlink(socket_name);
910         ret = create_local_socket(socket_name, &unix_addr,
911                 S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IWOTH);
912         if (ret < 0)
913                 goto err;
914         fd = ret;
915         if (listen(fd , 5) < 0) {
916                 ret = -ERRNO_TO_PARA_ERROR(errno);
917                 goto err;
918         }
919         ret = mark_fd_nonblocking(fd);
920         if (ret < 0)
921                 goto err;
922         return fd;
923 err:
924         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
925         exit(EXIT_FAILURE);
926 }
927
928 static void signal_pre_select(struct sched *s, struct task *t)
929 {
930         struct signal_task *st = container_of(t, struct signal_task, task);
931         para_fd_set(st->fd, &s->rfds, &s->max_fileno);
932 }
933
934 static void signal_post_select(struct sched *s, struct task *t)
935 {
936         struct signal_task *st = container_of(t, struct signal_task, task);
937
938         if (!FD_ISSET(st->fd, &s->rfds))
939                 return;
940
941         st->signum = para_next_signal();
942         switch (st->signum) {
943         case SIGINT:
944         case SIGTERM:
945         case SIGHUP:
946                 PARA_EMERG_LOG("terminating on signal %d\n", st->signum);
947                 clean_exit(EXIT_FAILURE, "caught deadly signal");
948         }
949 }
950
951 static void signal_setup_default(struct signal_task *st)
952 {
953         st->task.pre_select = signal_pre_select;
954         st->task.post_select = signal_post_select;
955         sprintf(st->task.status, "signal task");
956 }
957
958 static void command_pre_select(struct sched *s, struct task *t)
959 {
960         struct command_task *ct = container_of(t, struct command_task, task);
961         para_fd_set(ct->fd, &s->rfds, &s->max_fileno);
962 }
963
964 static void command_post_select(struct sched *s, struct task *t)
965 {
966         int ret;
967         struct command_task *ct = container_of(t, struct command_task, task);
968         static struct timeval last_status_dump;
969         struct timeval tmp, delay = {0, 500 * 1000};
970
971         tv_add(&last_status_dump, &delay, &tmp);
972         if (tv_diff(&tmp, now, NULL) < 0) {
973                 audiod_status_dump();
974                 last_status_dump = *now;
975         }
976
977         if (!FD_ISSET(ct->fd, &s->rfds))
978                 return;
979         ret = handle_connect(ct->fd);
980         if (ret < 0)
981                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
982 }
983
984 static void init_command_task(struct command_task *ct)
985 {
986         ct->task.pre_select = command_pre_select;
987         ct->task.post_select = command_post_select;
988         ct->task.error = 0;
989         ct->fd = audiod_get_socket(); /* doesn't return on errors */
990         sprintf(ct->task.status, "command task");
991 }
992
993 static void close_stat_pipe(void)
994 {
995         if (!stat_task->ct)
996                 return;
997         client_close(stat_task->ct);
998         stat_task->ct = NULL;
999         clear_and_dump_items();
1000         stat_task->length_seconds = 0;
1001         stat_task->offset_seconds = 0;
1002         stat_task->vss_status = 0;
1003         stat_task->current_audio_format_num = -1;
1004         audiod_status_dump();
1005 }
1006
1007 /**
1008  * close the connection to para_server and exit
1009  *
1010  * \param status the exit status which is passed to exit(3)
1011  * \param msg the log message
1012  *
1013  * Log \a msg with loglevel \p EMERG, close the connection to para_server if
1014  * open, and call \p exit(status). \a status should be either EXIT_SUCCESS or
1015  * EXIT_FAILURE.
1016  *
1017  * \sa exit(3)
1018  */
1019 void __noreturn clean_exit(int status, const char *msg)
1020 {
1021         PARA_EMERG_LOG("%s\n", msg);
1022         if (socket_name)
1023                 unlink(socket_name);
1024         close_stat_pipe();
1025         exit(status);
1026 }
1027
1028 /* avoid busy loop if server is down */
1029 static void set_stat_task_restart_barrier(unsigned seconds)
1030 {
1031         struct timeval delay = {seconds, 0};
1032         tv_add(now, &delay, &stat_task->restart_barrier);
1033 }
1034
1035 static bool try_to_close_slot(int slot_num)
1036 {
1037         struct slot_info *s = &slot[slot_num];
1038         struct audio_format_info *a = afi + s->format;
1039         int i;
1040
1041         if (s->format < 0)
1042                 return false;
1043         if (s->receiver_node && s->receiver_node->task.error != -E_TASK_UNREGISTERED)
1044                 return false;
1045         for (i = 0; i < a->num_filters; i++)
1046                 if (s->fns && s->fns[i].task.error != -E_TASK_UNREGISTERED)
1047                         return false;
1048         for (i = 0; i < a->num_writers; i++)
1049                 if (s->wns && s->wns[i].task.error != -E_TASK_UNREGISTERED)
1050                         return false;
1051         PARA_INFO_LOG("closing slot %d\n", slot_num);
1052         close_writers(s);
1053         _close_filters(s);
1054         close_receiver(slot_num);
1055         clear_slot(slot_num);
1056         return true;
1057 }
1058
1059 /*
1060  * Check if any receivers/filters/writers need to be started and do so if
1061  * necessary.
1062  */
1063 static void start_stop_decoders(struct sched *s)
1064 {
1065         int i, ret;
1066         struct slot_info *sl;
1067         struct audio_format_info *a;
1068
1069         FOR_EACH_SLOT(i)
1070                 if (try_to_close_slot(i))
1071                         sched_min_delay(s);
1072 //      if (audiod_status != AUDIOD_ON ||
1073 //                      !(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1074 //              return kill_all_decoders(-E_NOT_PLAYING);
1075         ret = open_current_receiver(s);
1076         if (ret < 0)
1077                 return;
1078         sl = slot + ret;
1079         a = afi + sl->format;
1080         if (a->num_filters)
1081                 open_filters(sl);
1082         open_writers(sl);
1083         activate_grab_clients();
1084         btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1085         sched_min_delay(s);
1086 }
1087
1088 /* restart the client task if necessary */
1089 static void status_pre_select(struct sched *s, struct task *t)
1090 {
1091         struct status_task *st = container_of(t, struct status_task, task);
1092
1093         if (audiod_status == AUDIOD_OFF) {
1094                 if (!st->ct)
1095                         goto out;
1096                 if (st->ct->task.error >= 0) {
1097                         st->ct->task.error = -E_AUDIOD_OFF;
1098                         goto out;
1099                 }
1100                 if (st->ct->task.error != -E_TASK_UNREGISTERED)
1101                         goto out;
1102                 close_stat_pipe();
1103                 st->clock_diff_count = conf.clock_diff_count_arg;
1104                 goto out;
1105         }
1106         if (st->ct) {
1107                 int ret;
1108                 if (st->ct->task.error < 0) {
1109                         if (st->ct->task.error != -E_TASK_UNREGISTERED)
1110                                 goto out;
1111                         close_stat_pipe();
1112                         goto out;
1113                 }
1114                 if (st->ct->status != CL_RECEIVING)
1115                         goto out;
1116                 ret = for_each_stat_item(st->ct->buf, st->ct->loaded,
1117                         update_item);
1118                 if (ret < 0) {
1119                         st->ct->task.error = ret;
1120                         goto out;
1121                 }
1122                 if (st->ct->loaded != ret) {
1123                         st->last_status_read = *now;
1124                         st->ct->loaded = ret;
1125                 } else {
1126                         struct timeval diff;
1127                         tv_diff(now, &st->last_status_read, &diff);
1128                         if (diff.tv_sec > 61)
1129                                 st->ct->task.error = -E_STATUS_TIMEOUT;
1130                 }
1131                 goto out;
1132         }
1133         if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1134                 goto out;
1135         if (st->clock_diff_count) { /* get status only one time */
1136                 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1137                 int argc = 5;
1138                 PARA_INFO_LOG("clock diff count: %d\n", st->clock_diff_count);
1139                 st->clock_diff_count--;
1140                 client_open(argc, argv, &st->ct, NULL);
1141                 set_stat_task_restart_barrier(2);
1142                 sched_min_delay(s);
1143
1144         } else {
1145                 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1146                 int argc = 4;
1147                 client_open(argc, argv, &st->ct, NULL);
1148                 set_stat_task_restart_barrier(5);
1149                 sched_min_delay(s);
1150         }
1151         free(stat_item_values[SI_BASENAME]);
1152         stat_item_values[SI_BASENAME] = para_strdup(
1153                 "no connection to para_server");
1154         stat_client_write_item(SI_BASENAME);
1155         st->last_status_read = *now;
1156 out:
1157         start_stop_decoders(s);
1158 }
1159
1160 static void init_status_task(struct status_task *st)
1161 {
1162         memset(st, 0, sizeof(struct status_task));
1163         st->task.pre_select = status_pre_select;
1164         st->sa_time_diff_sign = 1;
1165         st->clock_diff_count = conf.clock_diff_count_arg;
1166         st->current_audio_format_num = -1;
1167         sprintf(st->task.status, "status task");
1168 }
1169
1170 static void set_initial_status(void)
1171 {
1172         audiod_status = AUDIOD_ON;
1173         if (!conf.mode_given)
1174                 return;
1175         if (!strcmp(conf.mode_arg, "sb")) {
1176                 audiod_status = AUDIOD_STANDBY;
1177                 return;
1178         }
1179         if (!strcmp(conf.mode_arg, "off")) {
1180                 audiod_status = AUDIOD_OFF;
1181                 return;
1182         }
1183         if (strcmp(conf.mode_arg, "on"))
1184                 PARA_WARNING_LOG("invalid mode\n");
1185 }
1186
1187 __noreturn static void print_help_and_die(void)
1188 {
1189         int d = conf.detailed_help_given;
1190         const char **p = d? audiod_args_info_detailed_help
1191                 : audiod_args_info_help;
1192
1193         printf_or_die("%s\n\n", AUDIOD_CMDLINE_PARSER_PACKAGE "-"
1194                 AUDIOD_CMDLINE_PARSER_VERSION);
1195         printf_or_die("%s\n\n", audiod_args_info_usage);
1196         for (; *p; p++)
1197                 printf_or_die("%s\n", *p);
1198         print_receiver_helps(d);
1199         print_filter_helps(d);
1200         print_writer_helps(d);
1201         exit(0);
1202 }
1203
1204 static void init_colors_or_die(void)
1205 {
1206         int ret, i;
1207
1208         if (!want_colors())
1209                 return;
1210         daemon_set_default_log_colors();
1211         daemon_set_flag(DF_COLOR_LOG);
1212         for (i = 0; i < conf.log_color_given; i++) {
1213                 ret = daemon_set_log_color(conf.log_color_arg[i]);
1214                 if (ret < 0)
1215                         exit(EXIT_FAILURE);
1216         }
1217 }
1218
1219 /**
1220  * the main function of para_audiod
1221  *
1222  * \param argc usual argument count
1223  * \param argv usual argument vector
1224  *
1225  * \return EXIT_SUCCESS or EXIT_FAILURE
1226  *
1227  * \sa para_audiod(1)
1228  * */
1229 int main(int argc, char *argv[])
1230 {
1231         int ret, i;
1232         static struct sched s;
1233         struct command_task command_task_struct, *cmd_task = &command_task_struct;
1234         struct audiod_cmdline_parser_params params = {
1235                 .override = 0,
1236                 .initialize = 1,
1237                 .check_required = 0,
1238                 .check_ambiguity = 0,
1239                 .print_errors = 1
1240         };
1241
1242         valid_fd_012();
1243         if (audiod_cmdline_parser_ext(argc, argv, &conf, &params))
1244                 exit(EXIT_FAILURE);
1245         HANDLE_VERSION_FLAG("audiod", conf);
1246         /* init receivers/filters/writers early to make help work */
1247         recv_init();
1248         filter_init();
1249         writer_init();
1250         if (conf.help_given || conf.detailed_help_given)
1251                 print_help_and_die();
1252         drop_privileges_or_die(conf.user_arg, conf.group_arg);
1253         parse_config_or_die();
1254         init_colors_or_die();
1255         init_random_seed_or_die();
1256         daemon_set_flag(DF_LOG_TIME);
1257         daemon_set_flag(DF_LOG_HOSTNAME);
1258         daemon_set_flag(DF_LOG_LL);
1259         if (conf.log_timing_given)
1260                 daemon_set_flag(DF_LOG_TIMING);
1261         if (conf.logfile_given) {
1262                 daemon_set_logfile(conf.logfile_arg);
1263                 daemon_open_log_or_die();
1264         }
1265         ret = parse_stream_args();
1266         if (ret < 0) {
1267                 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1268                 exit(EXIT_FAILURE);
1269         }
1270         log_welcome("para_audiod");
1271         server_uptime(UPTIME_SET);
1272         set_initial_status();
1273         FOR_EACH_SLOT(i)
1274                 clear_slot(i);
1275         setup_signal_handling();
1276         signal_setup_default(sig_task);
1277
1278         init_status_task(stat_task);
1279         init_command_task(cmd_task);
1280
1281         if (conf.daemon_given)
1282                 daemonize();
1283
1284         register_task(&sig_task->task);
1285         register_task(&cmd_task->task);
1286         register_task(&stat_task->task);
1287         s.default_timeout.tv_sec = 2;
1288         s.default_timeout.tv_usec = 999 * 1000;
1289         ret = schedule(&s);
1290
1291         PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1292         return EXIT_FAILURE;
1293 }