1 /* Copyright (C) 2005 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
3 /** \file audiod.c The paraslash's audio daemon. */
5 #include <netinet/in.h>
6 #include <sys/socket.h>
16 #include "audiod.lsg.h"
17 #include "recv_cmd.lsg.h"
24 #include "buffer_tree.h"
27 #include "grab_client.h"
38 /** Array of error strings. */
41 static struct lls_parse_result *lpr;
42 #define CMD_PTR (lls_cmd(0, audiod_suite))
43 #define OPT_RESULT(_name) (lls_opt_result(LSG_AUDIOD_PARA_AUDIOD_OPT_ ## _name, lpr))
44 #define OPT_GIVEN(_name) (lls_opt_given(OPT_RESULT(_name)))
45 #define OPT_STRING_VAL(_name) (lls_string_val(0, OPT_RESULT(_name)))
46 #define OPT_UINT32_VAL(_name) (lls_uint32_val(0, OPT_RESULT(_name)))
48 __printf_2_3 void (*para_log)(int, const char*, ...) = daemon_log;
49 /** define the array containing all supported audio formats */
50 const char *audio_formats[] = {AUDIOD_AUDIO_FORMAT_ARRAY NULL};
52 /** Defines how audiod handles one supported audio format. */
53 struct audio_format_info {
54 /** the receiver for this audio format */
56 /** Parsed receiver command line. */
57 struct lls_parse_result *receiver_lpr;
58 /** the number of filters that should be activated for this audio format */
59 unsigned int num_filters;
60 /** Array of filter numbers to be activated. */
61 unsigned *filter_nums;
62 /** Pointer to the array of filter configurations. */
64 /** Parsed filter command line, one parse result per filter. */
65 struct lls_parse_result **filter_lpr;
66 /** the number of filters that should be activated for this audio format */
67 unsigned int num_writers;
68 /** Array of writer IDs to be activated. */
70 /** Parsed writer command line(s) */
71 struct lls_parse_result **writer_lpr;
72 /** do not start receiver/filters/writer before this time */
73 struct timeval restart_barrier;
76 /* Describes one instance of a receiver-filter-writer chain. */
78 /* Number of the audio format in this slot. */
80 /* The stream_start status item announced by para_server. */
81 struct timeval server_stream_start;
82 /* The offset status item announced by para_server. */
83 unsigned offset_seconds;
84 /* The seconds_total status item announced by para_server. */
85 unsigned seconds_total;
86 /* The receiver info associated with this slot. */
87 struct receiver_node *receiver_node;
88 /* The array of filter nodes. */
89 struct filter_node *fns;
90 /* The array of writers attached to the last filter. */
91 struct writer_node *wns;
94 #define RECEIVER_CMD(_a) lls_cmd((_a)->receiver_num, recv_cmd_suite)
95 #define RECEIVER(_a) ((const struct receiver *)lls_user_data(RECEIVER_CMD(_a)))
97 /** Maximal number of simultaneous instances. */
98 #define MAX_STREAM_SLOTS 5
100 /** Iterate over all slots. */
101 #define FOR_EACH_SLOT(_slot) for (_slot = 0; _slot < MAX_STREAM_SLOTS; _slot++)
104 * para_audiod uses \p MAX_STREAM_SLOTS different slots, each of which may
105 * be associated with a receiver/filter/writer triple. This array holds all
106 * information on the status of these slots.
108 struct slot_info slot[MAX_STREAM_SLOTS];
110 /** The vss status flags audiod is interested in. */
111 enum vss_status_flags {
112 /** Whether the 'N' flag is set. */
113 VSS_STATUS_FLAG_NEXT = 1,
114 /** The 'P' flag is set. */
115 VSS_STATUS_FLAG_PLAYING = 2,
119 * The scheduler instance of para_audiod.
121 * This is needed also in audiod_command.c (for the tasks command), so it can
122 * not be made static.
124 struct sched sched = {.timeout = 0};
126 /* The task for obtaining para_server's status (para_client stat). */
128 /** The associated task structure of audiod. */
130 /** Client data associated with the stat task. */
131 struct client_task *ct;
132 /** Do not restart client command until this time. */
133 struct timeval restart_barrier;
134 /** Last time we received status data from para_server. */
135 struct timeval last_status_read;
137 /** The offset value announced by para_server. */
139 /** The length of the current audio file as announced by para_server. */
141 /** The start of the current stream from the view of para_server. */
142 struct timeval server_stream_start;
143 /** The average time deviation between para_server and para_audiod. */
144 struct timeval sa_time_diff;
145 /** Whether client time is ahead of server time. */
146 int sa_time_diff_sign;
147 /** The 'P' and the 'N' flags as announced by para_server. */
148 enum vss_status_flags vss_status;
149 /** Number of times the clock difference is to be checked. */
150 unsigned clock_diff_count;
151 /** When to start the next check for clock difference. */
152 struct timeval clock_diff_barrier;
153 /** Number of the audio format as announced by para_server. */
154 int current_audio_format_num;
155 /* The status task btrn is the child of the client task. */
156 struct btr_node *btrn;
159 /** The array of status items sent by para_server. */
160 char *stat_item_values[NUM_STAT_ITEMS] = {NULL};
163 * The current mode of operation (AUDIOD_OFF, AUDIOD_ON or AUDIOD_STANDBY).
164 * Set by the on/off/cycle commands.
166 int audiod_status = AUDIOD_ON;
168 static char *socket_name;
169 static struct audio_format_info afi[NUM_AUDIO_FORMATS];
170 static struct signal_task *signal_task;
171 static struct status_task status_task_struct;
172 static uid_t *uid_whitelist;
175 * The task that calls the status command of para_server.
177 * \sa \ref struct status_task.
179 static struct status_task *stat_task = &status_task_struct;
181 struct command_task {
182 /** The local listening socket. */
184 /** The associated task structure. */
188 /** Iterate over all supported audio formats. */
189 #define FOR_EACH_AUDIO_FORMAT(af) for (af = 0; af < NUM_AUDIO_FORMATS; af++)
192 * Get the audio format number.
194 * \param name The name of the audio format.
196 * \return The audio format number on success, -E_UNSUPPORTED_AUDIO_FORMAT if
197 * \a name is not a supported audio format.
199 static int get_audio_format_num(const char *name)
203 while (para_isspace(*name))
205 FOR_EACH_AUDIO_FORMAT(i)
206 if (!strcmp(name, audio_formats[i]))
208 return -E_UNSUPPORTED_AUDIO_FORMAT;
212 * Return the flags for the \a decoder_flags status item.
214 * Allocates a string which contains one octal digit per slot. Bit zero (value
215 * 1) is set if a receiver is active. Bit one (value 2) and bit three (value 4)
216 * have the analogous meaning for filter and writer, respectively.
218 * \return String that must be freed by the caller.
220 __malloc char *audiod_get_decoder_flags(void)
223 char flags[MAX_STREAM_SLOTS + 1];
226 struct slot_info *s = &slot[i];
228 if (s->receiver_node)
236 flags[MAX_STREAM_SLOTS] = '\0';
237 return para_strdup(flags);
240 static int get_matching_audio_format_nums(const char *re)
245 ret = para_regcomp(&preg, re, REG_EXTENDED | REG_NOSUB);
249 FOR_EACH_AUDIO_FORMAT(i)
250 if (regexec(&preg, audio_formats[i], 0, NULL, 0) != REG_NOMATCH)
256 static int get_play_time_slot_num(void)
258 int i, oldest_slot = -1;
259 struct timeval oldest_wstime = {0, 0};
262 struct slot_info *s = &slot[i];
263 struct timeval wstime;
264 if (!s->wns || !s->wns[0].btrn)
266 btr_get_node_start(s->wns[0].btrn, &wstime);
267 if (oldest_slot >= 0 && tv_diff(&wstime, &oldest_wstime, NULL) > 0)
269 oldest_wstime = wstime;
276 * Compute the play time based on information of the current slot.
278 * This computes a string of the form "0:07 [3:33] (3%/3:40)" using information
279 * from the status items received from para_server and the start time of the
280 * (first) writer of the current slot.
282 * It has to take into account that the stream was probably not started at
283 * the beginning of the file, that the clock between the server and the client
284 * host may differ and that playback of the stream was delayed, e.g. because
285 * the prebuffer filter is used in the filter configuration.
287 * If no writer is active, for example because para_audiod runs in standby
288 * mode, an approximation based only on the status items is computed and the
289 * returned string is prefixed with "~".
291 * \return A string that must be freed by the caller.
293 __malloc char *get_time_string(void)
295 int ret, seconds = 0, length = stat_task->length_seconds;
296 struct timeval *tmp, sum, sss, /* server stream start */
297 rstime, /* receiver start time */
298 wstime, /* writer start time */
299 wtime, /* now - writer start */
300 rskip; /* receiver start - sss */
301 int slot_num = get_play_time_slot_num();
302 struct slot_info *s = slot_num < 0? NULL : &slot[slot_num];
303 bool writer_active = s && s->wns && s->wns[0].btrn;
306 if (audiod_status == AUDIOD_OFF)
308 if (stat_task->server_stream_start.tv_sec == 0) {
309 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
310 goto out; /* server is about to change file */
311 if (length > 0) /* paused */
313 goto empty; /* stopped */
316 * Valid status items and playing, set length and tmp to the stream
317 * start. We use the writer start time from the slot info and fall back
318 * to the info from current status items if no writer is active yet.
320 tmp = &stat_task->server_stream_start;
322 btr_get_node_start(s->wns[0].btrn, &wstime);
323 if (wstime.tv_sec != 0) { /* writer wrote something */
324 if (s->server_stream_start.tv_sec == 0) {
325 /* copy status info to slot */
326 s->server_stream_start = stat_task->server_stream_start;
327 s->offset_seconds = stat_task->offset_seconds;
328 s->seconds_total = stat_task->length_seconds;
330 length = s->seconds_total;
331 tmp = &s->server_stream_start;
334 if (stat_task->sa_time_diff_sign > 0)
335 tv_diff(tmp, &stat_task->sa_time_diff, &sss);
337 tv_add(tmp, &stat_task->sa_time_diff, &sss);
338 if (!writer_active) {
340 tv_diff(now, &sss, &diff);
341 seconds = diff.tv_sec + stat_task->offset_seconds;
344 tv_diff(now, &wstime, &wtime);
345 //PARA_CRIT_LOG("offset %d\n", s->offset_seconds);
346 seconds = s->offset_seconds;
347 if (s->receiver_node->btrn) {
348 btr_get_node_start(s->receiver_node->btrn, &rstime);
349 ret = tv_diff(&rstime, &sss, &rskip);
350 if (ret > 0 && rskip.tv_sec > 2) {
351 /* audiod was started in the middle of the stream */
352 tv_add(&wtime, &rskip, &sum);
353 seconds += sum.tv_sec;
355 seconds += wtime.tv_sec;
357 seconds += wtime.tv_sec;
359 seconds = PARA_MIN(seconds, length);
360 seconds = PARA_MAX(seconds, 0);
362 "%s%d:%02d [%d:%02d] (%d%%/%d:%02d)",
366 (length - seconds) / 60,
367 (length - seconds) % 60,
368 length? (seconds * 100 + length / 2) / length : 0,
372 //PARA_DEBUG_LOG("slot %d: %s\n", slot_num, msg);
375 return para_strdup(NULL);
378 static void parse_config_or_die(void)
383 ret = lsu_merge_config_file_options(OPT_STRING_VAL(CONFIG_FILE),
384 "audiod.conf", &lpr, CMD_PTR, audiod_suite, 0U /* flags */);
386 PARA_EMERG_LOG("failed to parse config file: %s\n",
387 para_strerror(-ret));
390 daemon_set_loglevel(OPT_UINT32_VAL(LOGLEVEL));
391 n = OPT_GIVEN(USER_ALLOW);
394 uid_whitelist = arr_alloc(n, sizeof(uid_t));
395 for (i = 0; i < n; i++) {
396 const char *arg = lls_string_val(i, OPT_RESULT(USER_ALLOW));
399 ret = para_atoi32(arg, &val);
401 uid_whitelist[i] = val;
406 PARA_EMERG_LOG("invalid username: %s\n", arg);
409 uid_whitelist[i] = pw->pw_uid;
413 static void setup_signal_handling(void)
415 signal_task = signal_init_or_die();
416 para_install_sighandler(SIGINT);
417 para_install_sighandler(SIGTERM);
418 para_install_sighandler(SIGHUP);
419 para_sigaction(SIGPIPE, SIG_IGN);
422 static void clear_slot(int slot_num)
424 struct slot_info *s = &slot[slot_num];
426 PARA_INFO_LOG("clearing slot %d\n", slot_num);
427 memset(s, 0, sizeof(struct slot_info));
431 static void close_receiver(int slot_num)
433 struct slot_info *s = &slot[slot_num];
434 struct audio_format_info *a;
436 if (s->format < 0 || !s->receiver_node)
439 PARA_NOTICE_LOG("closing %s receiver in slot %d\n",
440 audio_formats[s->format], slot_num);
441 RECEIVER(a)->close(s->receiver_node);
442 btr_remove_node(&s->receiver_node->btrn);
443 task_reap(&s->receiver_node->task);
444 free(s->receiver_node);
445 s->receiver_node = NULL;
446 if (audiod_status == AUDIOD_ON)
447 stat_task->current_audio_format_num = -1;
448 tv_add(now, &(struct timeval)EMBRACE(0, 200 * 1000),
449 &a->restart_barrier);
452 static void writer_cleanup(struct writer_node *wn)
456 PARA_INFO_LOG("closing %s\n", writer_name(wn->wid));
457 writer_get(wn->wid)->close(wn);
458 btr_remove_node(&wn->btrn);
459 task_reap(&wn->task);
462 static void close_writers(struct slot_info *s)
464 struct audio_format_info *a;
471 if (a->num_writers == 0)
472 writer_cleanup(s->wns);
474 for (i = 0; i < a->num_writers; i++)
475 writer_cleanup(s->wns + i);
481 static void notify_writers(int error)
486 struct slot_info *s = slot + i;
487 struct audio_format_info *a;
493 for (j = 0; j < a->num_writers; j++)
494 task_notify(s->wns[j].task, error);
498 static void close_filters(struct slot_info *s)
501 struct audio_format_info *a = afi + s->format;
502 if (a->num_filters == 0)
504 for (i = a->num_filters - 1; i >= 0; i--) {
505 struct filter_node *fn = s->fns + i;
506 const struct filter *f;
510 f = filter_get(fn->filter_num);
513 btr_remove_node(&fn->btrn);
514 task_reap(&fn->task);
520 static void notify_receivers(int error)
525 struct slot_info *s = slot + i;
528 if (!s->receiver_node)
530 task_notify(s->receiver_node->task, error);
534 static int get_empty_slot(void)
545 if (s->wns || s->receiver_node || s->fns)
550 return -E_NO_MORE_SLOTS;
553 static void open_filters(struct slot_info *s)
555 struct audio_format_info *a = afi + s->format;
556 struct filter_node *fn;
557 int nf = a->num_filters;
558 struct btr_node *parent;
563 PARA_INFO_LOG("opening %s filters\n", audio_formats[s->format]);
564 assert(s->fns == NULL);
565 s->fns = zalloc(nf * sizeof(struct filter_node));
566 parent = s->receiver_node->btrn;
567 for (i = 0; i < nf; i++) {
570 const struct filter *f = filter_get(a->filter_nums[i]);
572 fn->filter_num = a->filter_nums[i];
573 fn->conf = a->filter_conf[i];
574 fn->lpr = a->filter_lpr[i];
575 name = filter_name(fn->filter_num);
576 fn->btrn = btr_new_node(&(struct btr_node_description)
577 EMBRACE(.name = name, .parent = parent,
578 .handler = f->execute, .context = fn));
582 sprintf(buf, "%s (slot %d)", name, (int)(s - slot));
583 fn->task = task_register(&(struct task_info) {
585 .pre_monitor = f->pre_monitor,
586 .post_monitor = f->post_monitor,
590 PARA_NOTICE_LOG("%s filter %d/%d (%s) started in slot %d\n",
591 audio_formats[s->format], i, nf, name, (int)(s - slot));
595 static void open_writers(struct slot_info *s)
598 struct audio_format_info *a = afi + s->format;
599 struct writer_node *wn;
600 struct btr_node *parent = s->fns[a->num_filters - 1].btrn;
602 assert(s->wns == NULL);
603 s->wns = zalloc(PARA_MAX(1U, a->num_writers)
604 * sizeof(struct writer_node));
605 for (i = 0; i < a->num_writers; i++) {
607 wn->wid = a->wids[i];
608 wn->lpr = a->writer_lpr[i];
609 register_writer_node(wn, parent, &sched);
610 PARA_NOTICE_LOG("%s writer started in slot %d\n",
611 writer_name(a->wids[i]), (int)(s - slot));
615 /* returns slot num on success */
616 static int open_receiver(int format)
618 struct audio_format_info *a = &afi[format];
621 const struct receiver *r = RECEIVER(a);
622 const char *name = lls_command_name(RECEIVER_CMD(a));
623 struct receiver_node *rn;
625 tv_add(now, &(struct timeval)EMBRACE(2, 0), &a->restart_barrier);
626 ret = get_empty_slot();
630 rn = zalloc(sizeof(*rn));
632 rn->lpr = a->receiver_lpr;
633 rn->btrn = btr_new_node(&(struct btr_node_description)
634 EMBRACE(.name = name, .context = rn));
637 PARA_ERROR_LOG("could not open %s receiver\n", name);
638 btr_remove_node(&rn->btrn);
644 s->receiver_node = rn;
645 PARA_NOTICE_LOG("started %s: %s receiver in slot %d\n",
646 audio_formats[format], name, slot_num);
647 rn->task = task_register(&(struct task_info) {
649 .pre_monitor = r->pre_monitor,
650 .post_monitor = r->post_monitor,
656 static bool receiver_running(void)
659 long unsigned ss1 = stat_task->server_stream_start.tv_sec;
662 struct slot_info *s = &slot[i];
663 long unsigned ss2 = s->server_stream_start.tv_sec;
665 if (!s->receiver_node)
667 if (task_status(s->receiver_node->task) >= 0)
676 * Return the root node of the current buffer tree.
678 * This is only used for stream grabbing.
680 * \return \p NULL if no slot is currently active. If more than one buffer tree
681 * exists, the node corresponding to the most recently started receiver is
684 struct btr_node *audiod_get_btr_root(void)
686 int i, newest_slot = -1;
687 struct timeval newest_rstime = {0, 0};
690 struct slot_info *s = &slot[i];
691 struct timeval rstime;
692 if (!s->receiver_node)
694 if (task_status(s->receiver_node->task) < 0)
696 btr_get_node_start(s->receiver_node->btrn, &rstime);
697 if (newest_slot >= 0 && tv_diff(&rstime, &newest_rstime, NULL) < 0)
699 newest_rstime = rstime;
702 if (newest_slot == -1)
704 return slot[newest_slot].receiver_node->btrn;
707 /* whether a new instance of a decoder should be started. */
708 static bool must_start_decoder(void)
710 int cafn = stat_task->current_audio_format_num;
711 unsigned vs = stat_task->vss_status;
713 if (audiod_status != AUDIOD_ON)
719 if (vs & VSS_STATUS_FLAG_NEXT)
721 if (!(vs & VSS_STATUS_FLAG_PLAYING))
723 if (receiver_running())
725 if (tv_diff(now, &afi[cafn].restart_barrier, NULL) < 0)
730 static void compute_time_diff(const struct timeval *status_time)
732 struct timeval tmp, diff;
733 static unsigned count;
734 int sign, sa_time_diff_sign = stat_task->sa_time_diff_sign;
735 const struct timeval max_deviation = {0, 500 * 1000};
736 const int time_smooth = 5;
738 sign = tv_diff(status_time, now, &diff);
739 // PARA_NOTICE_LOG("%s: sign = %i, sa_time_diff_sign = %i\n", __func__,
740 // sign, sa_time_diff_sign);
742 sa_time_diff_sign = sign;
743 stat_task->sa_time_diff = diff;
748 int s = tv_diff(&diff, &stat_task->sa_time_diff, &tmp);
749 if (tv_diff(&max_deviation, &tmp, NULL) < 0)
750 PARA_WARNING_LOG("time diff jump: %c%lums\n",
751 s < 0? '-' : '+', tv2ms(&tmp));
754 sa_time_diff_sign = tv_convex_combination(
755 sa_time_diff_sign * time_smooth, &stat_task->sa_time_diff,
756 count > 10? sign : sign * time_smooth, &diff,
758 stat_task->sa_time_diff = tmp;
759 PARA_INFO_LOG("time diff (cur/avg): %s%lums/%s%lums\n",
762 sa_time_diff_sign < 0? "-" : "+",
763 tv2ms(&stat_task->sa_time_diff)
766 stat_task->sa_time_diff_sign = sa_time_diff_sign;
769 static int update_item(int itemnum, char *buf)
771 long unsigned sec, usec;
773 if (stat_task->clock_diff_count && itemnum != SI_current_time)
775 free(stat_item_values[itemnum]);
776 stat_item_values[itemnum] = para_strdup(buf);
777 stat_client_write_item(itemnum);
779 case SI_status_flags:
780 stat_task->vss_status = 0;
781 if (strchr(buf, 'N'))
782 stat_task->vss_status |= VSS_STATUS_FLAG_NEXT;
783 if (strchr(buf, 'P'))
784 stat_task->vss_status |= VSS_STATUS_FLAG_PLAYING;
787 stat_task->offset_seconds = atoi(buf);
789 case SI_seconds_total:
790 stat_task->length_seconds = atoi(buf);
792 case SI_stream_start:
793 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
794 stat_task->server_stream_start.tv_sec = sec;
795 stat_task->server_stream_start.tv_usec = usec;
798 case SI_current_time:
799 if (sscanf(buf, "%lu.%lu", &sec, &usec) == 2) {
800 struct timeval tv = {sec, usec};
801 compute_time_diff(&tv);
805 stat_task->current_audio_format_num
806 = get_audio_format_num(buf);
811 static int parse_stream_command(const char *txt, const char **cmd)
814 char *re, *p = strchr(txt, ':');
817 return -E_MISSING_COLON;
821 strncpy(re, txt, len);
823 ret = get_matching_audio_format_nums(re);
828 static int add_filter(int format, const char *cmdline)
830 struct audio_format_info *a = &afi[format];
831 int ret, filter_num, nf = a->num_filters;
833 struct lls_parse_result *flpr;
835 ret = filter_setup(cmdline, &cfg, &flpr);
839 a->filter_lpr = arr_realloc(a->filter_lpr, nf + 1, sizeof(flpr));
840 a->filter_conf = arr_realloc(a->filter_conf, nf + 1, sizeof(void *));
841 a->filter_nums = arr_realloc(a->filter_nums, nf + 1, sizeof(unsigned));
843 a->filter_nums[nf] = filter_num;
844 a->filter_conf[nf] = cfg;
845 a->filter_lpr[nf] = flpr;
847 PARA_INFO_LOG("%s filter %d: %s\n", audio_formats[format], nf,
848 filter_name(filter_num));
852 static int parse_writer_args(void)
856 struct audio_format_info *a;
858 for (i = 0; i < OPT_GIVEN(WRITER); i++) {
861 ret = parse_stream_command(lls_string_val(i,
862 OPT_RESULT(WRITER)), &cmd);
866 FOR_EACH_AUDIO_FORMAT(j) {
868 if ((af_mask & (1 << j)) == 0) /* no match */
871 a->wids = para_realloc(a->wids, (nw + 1) * sizeof(int));
872 a->writer_lpr = para_realloc(a->writer_lpr,
873 (nw + 1) * sizeof(struct lls_parse_result *));
874 a->wids[nw] = check_writer_arg_or_die(cmd,
876 PARA_INFO_LOG("%s writer #%d: %s\n", audio_formats[j],
877 nw, writer_name(a->wids[nw]));
881 /* Use default writer for audio formats which are not yet set up. */
882 FOR_EACH_AUDIO_FORMAT(i) {
884 if (a->num_writers > 0)
885 continue; /* already set up */
887 a->wids = alloc(sizeof(int));
888 a->writer_lpr = alloc(sizeof(struct lls_parse_result *));
889 a->wids[0] = check_writer_arg_or_die(NULL, a->writer_lpr);
890 PARA_INFO_LOG("%s writer: %s (default)\n", audio_formats[i],
891 writer_name(a->wids[0]));
896 static int parse_receiver_args(void)
900 struct audio_format_info *a;
902 FOR_EACH_AUDIO_FORMAT(i)
903 afi[i].receiver_num = -1;
904 for (i = OPT_GIVEN(RECEIVER) - 1; i >= 0; i--) {
907 ret = parse_stream_command(lls_string_val(i,
908 OPT_RESULT(RECEIVER)), &arg);
912 FOR_EACH_AUDIO_FORMAT(j) {
914 if ((af_mask & (1 << j)) == 0) /* no match */
917 * If multiple receivers are given for this audio format, the
918 * last one wins and we have to free the previous receiver
919 * config here. Since we are iterating backwards, the winning
920 * receiver arg is in fact the first one given.
922 lls_free_parse_result(a->receiver_lpr, RECEIVER_CMD(a));
923 a->receiver_num = check_receiver_arg(arg, &a->receiver_lpr);
927 * Use the default receiver for those audio formats for which no
928 * receiver was specified.
930 FOR_EACH_AUDIO_FORMAT(i) {
932 if (a->receiver_num >= 0)
934 a->receiver_num = check_receiver_arg(NULL, &a->receiver_lpr);
936 FOR_EACH_AUDIO_FORMAT(i) {
938 PARA_INFO_LOG("receiving %s streams via %s receiver\n",
939 audio_formats[i], lls_command_name(RECEIVER_CMD(a)));
946 static int init_default_filters(void)
950 FOR_EACH_AUDIO_FORMAT(i) {
951 struct audio_format_info *a = &afi[i];
952 const char *name = lls_command_name(RECEIVER_CMD(a));
957 continue; /* no default -- nothing to to */
959 * udp and dccp streams are fec-encoded, so add fecdec as the
962 if (strcmp(name, "udp") == 0 || strcmp(name, "dccp") == 0) {
963 tmp = para_strdup("fecdec");
964 ret = add_filter(i, tmp);
969 /* add "dec" to audio format name */
970 tmp = make_message("%sdec", audio_formats[i]);
971 for (j = 1; filter_get(j); j++)
972 if (!strcmp(tmp, filter_name(j)))
975 ret = -E_UNSUPPORTED_FILTER;
978 tmp = para_strdup(filter_name(j));
979 ret = add_filter(i, tmp);
983 PARA_INFO_LOG("%s -> default filter: %s\n", audio_formats[i],
990 static int parse_filter_args(void)
992 int i, j, ret, af_mask, num_matches;
994 for (i = 0; i < OPT_GIVEN(FILTER); i++) {
996 ret = parse_stream_command(lls_string_val(i,
997 OPT_RESULT(FILTER)), &arg);
1002 FOR_EACH_AUDIO_FORMAT(j) {
1003 if ((af_mask & (1 << j)) == 0) /* no match */
1005 ret = add_filter(j, arg);
1010 if (num_matches == 0)
1011 PARA_WARNING_LOG("ignoring filter spec: %s\n",
1012 lls_string_val(i, OPT_RESULT(FILTER)));
1014 ret = init_default_filters(); /* use default values for the rest */
1019 static int parse_stream_args(void)
1023 ret = parse_receiver_args();
1026 ret = parse_filter_args();
1029 ret = parse_writer_args();
1035 /* does not unlink socket on errors */
1036 static void init_local_socket(struct command_task *ct)
1038 if (OPT_GIVEN(SOCKET))
1039 socket_name = para_strdup(OPT_STRING_VAL(SOCKET));
1041 char *hn = para_hostname();
1042 socket_name = make_message("/var/paraslash/audiod_socket.%s",
1046 PARA_NOTICE_LOG("local socket: %s\n", socket_name);
1047 if (OPT_GIVEN(FORCE))
1048 unlink(socket_name);
1049 ct->fd = create_local_socket(socket_name);
1052 PARA_EMERG_LOG("%s\n", para_strerror(-ct->fd));
1056 static int signal_post_monitor(struct sched *s, void *context)
1058 struct signal_task *st = context;
1061 ret = task_get_notification(st->task);
1064 signum = para_next_signal();
1069 PARA_WARNING_LOG("terminating on signal %d\n", signum);
1070 task_notify_all(s, E_AUDIOD_SIGNAL);
1071 return -E_AUDIOD_SIGNAL;
1076 static void command_pre_monitor(struct sched *s, void *context)
1078 struct command_task *ct = context;
1079 sched_monitor_readfd(ct->fd, s);
1082 static int command_post_monitor(struct sched *s, void *context)
1085 struct command_task *ct = context;
1086 static struct timeval last_status_dump;
1087 struct timeval tmp, delay;
1090 ret = task_get_notification(ct->task);
1093 ret = dispatch_local_connection(ct->fd);
1095 PARA_NOTICE_LOG("%s\n", para_strerror(-ret));
1096 if (ret == -E_AUDIOD_TERM) {
1097 task_notify_all(s, -ret);
1105 /* if last status dump was less than 500ms ago, do nothing */
1107 delay.tv_usec = 500 * 1000;
1108 tv_add(&last_status_dump, &delay, &tmp);
1109 if (tv_diff(now, &tmp, NULL) < 0)
1113 * If last status dump was more than 5s ago, force update. Otherwise,
1114 * update only those items that have changed.
1118 tv_add(&last_status_dump, &delay, &tmp);
1119 if (tv_diff(now, &tmp, NULL) > 0)
1122 audiod_status_dump(force);
1123 last_status_dump = *now;
1127 static void init_command_task(struct command_task *ct)
1129 init_local_socket(ct); /* doesn't return on errors */
1131 ct->task = task_register(&(struct task_info) {
1133 .pre_monitor = command_pre_monitor,
1134 .post_monitor = command_post_monitor,
1139 static void close_stat_pipe(void)
1143 task_reap(&stat_task->ct->task);
1144 client_close(stat_task->ct);
1145 stat_task->ct = NULL;
1146 clear_and_dump_items();
1147 stat_task->length_seconds = 0;
1148 stat_task->offset_seconds = 0;
1149 stat_task->vss_status = 0;
1150 stat_task->current_audio_format_num = -1;
1151 audiod_status_dump(true);
1154 /* avoid busy loop if server is down */
1155 static void set_stat_task_restart_barrier(unsigned seconds)
1157 struct timeval delay = {seconds, 0};
1158 tv_add(now, &delay, &stat_task->restart_barrier);
1161 static bool must_close_slot(int slot_num)
1163 struct slot_info *s = &slot[slot_num];
1164 struct audio_format_info *a = afi + s->format;
1169 if (s->receiver_node && task_status(s->receiver_node->task) >= 0)
1171 for (i = 0; i < a->num_filters; i++)
1172 if (s->fns && task_status(s->fns[i].task) >= 0)
1174 if (a->num_writers > 0) {
1175 for (i = 0; i < a->num_writers; i++)
1176 if (s->wns && task_status(s->wns[i].task) >= 0)
1179 if (s->wns && task_status(s->wns[0].task) >= 0)
1185 static void close_slot(int slot_num)
1187 struct slot_info *s = slot + slot_num;
1189 PARA_INFO_LOG("closing slot %d\n", slot_num);
1192 close_receiver(slot_num);
1193 clear_slot(slot_num);
1196 static void close_unused_slots(void)
1202 if (must_close_slot(i)) {
1207 audiod_status_dump(true);
1211 * Cleanup all resources.
1213 * This performs various cleanups, removes the audiod socket and closes the
1214 * connection to para_server.
1216 static void audiod_cleanup(void)
1219 unlink(socket_name);
1221 close_unused_slots();
1222 close_stat_clients();
1223 free(uid_whitelist);
1227 * Check if any receivers/filters/writers need to be started and do so if
1230 static void start_stop_decoders(void)
1233 struct slot_info *sl;
1235 close_unused_slots();
1236 if (audiod_status != AUDIOD_ON)
1237 return notify_writers(E_NOT_PLAYING);
1238 if (!(stat_task->vss_status & VSS_STATUS_FLAG_PLAYING))
1239 return notify_receivers(E_NOT_PLAYING);
1240 if (!must_start_decoder())
1242 ret = open_receiver(stat_task->current_audio_format_num);
1244 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1250 activate_grab_clients(&sched);
1251 btr_log_tree(sl->receiver_node->btrn, LL_NOTICE);
1252 audiod_status_dump(true);
1255 static void status_pre_monitor(struct sched *s, void *context)
1257 struct status_task *st = context;
1258 int i, ret, cafn = stat_task->current_audio_format_num;
1260 if (must_start_decoder())
1263 if (must_close_slot(i))
1265 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1268 if (st->ct && audiod_status == AUDIOD_OFF)
1270 if (!st->ct && audiod_status != AUDIOD_OFF)
1271 sched_request_barrier_or_min_delay(&st->restart_barrier, s);
1273 sched_request_barrier(&afi[cafn].restart_barrier, s);
1275 * If para_server is playing we'd like to have a smooth time display
1276 * even if we are running in standby mode. So we request a timeout that
1277 * expires at the next full second.
1279 if (stat_task->vss_status & VSS_STATUS_FLAG_PLAYING)
1280 sched_request_timeout_ms(1000 - now->tv_usec / 1000, s);
1286 /* restart the client task if necessary */
1287 static int status_post_monitor(struct sched *s, void *context)
1289 struct status_task *st = context;
1292 ret = task_get_notification(st->task);
1295 if (audiod_status == AUDIOD_OFF) {
1298 if (task_status(st->ct->task) >= 0) {
1299 task_notify(st->ct->task, E_AUDIOD_OFF);
1303 st->clock_diff_count = OPT_UINT32_VAL(CLOCK_DIFF_COUNT);
1310 ret = btr_node_status(st->btrn, st->min_iqs, BTR_NT_LEAF);
1315 if (st->ct->status != CL_EXECUTING)
1318 struct timeval diff;
1319 tv_diff(now, &st->last_status_read, &diff);
1320 if (diff.tv_sec > 61)
1321 task_notify(st->ct->task, E_STATUS_TIMEOUT);
1324 btr_merge(st->btrn, st->min_iqs);
1325 sz = btr_next_buffer(st->btrn, &buf);
1326 ret = for_each_stat_item(buf, sz, update_item);
1328 task_notify(st->ct->task, -ret);
1332 btr_consume(st->btrn, sz - ret);
1333 st->last_status_read = *now;
1335 } else /* current status item crosses buffers */
1336 st->min_iqs = sz + 1;
1339 btr_drain(st->btrn);
1340 st->current_audio_format_num = -1;
1341 if (tv_diff(now, &st->restart_barrier, NULL) < 0)
1343 if (st->clock_diff_count) { /* get status only one time */
1344 char *argv[] = {"audiod", "--", "stat", "-p", "-n=1", NULL};
1346 PARA_INFO_LOG("clock diff count: %u\n", st->clock_diff_count);
1347 st->clock_diff_count--;
1348 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1349 set_stat_task_restart_barrier(2);
1352 char *argv[] = {"audiod", "--", "stat", "-p", NULL};
1354 client_open(argc, argv, &st->ct, NULL, NULL, st->btrn, s);
1355 set_stat_task_restart_barrier(5);
1357 free(stat_item_values[SI_basename]);
1358 stat_item_values[SI_basename] = para_strdup(
1359 "no connection to para_server");
1360 stat_client_write_item(SI_basename);
1361 st->last_status_read = *now;
1363 start_stop_decoders();
1367 static void init_status_task(struct status_task *st)
1369 memset(st, 0, sizeof(struct status_task));
1370 st->sa_time_diff_sign = 1;
1371 st->clock_diff_count = OPT_UINT32_VAL(CLOCK_DIFF_COUNT);
1372 st->current_audio_format_num = -1;
1373 st->btrn = btr_new_node(&(struct btr_node_description)
1374 EMBRACE(.name = "stat"));
1376 stat_task->task = task_register(&(struct task_info) {
1378 .pre_monitor = status_pre_monitor,
1379 .post_monitor = status_post_monitor,
1380 .context = stat_task,
1384 static void set_initial_status(void)
1386 audiod_status = AUDIOD_ON;
1387 if (!OPT_GIVEN(MODE))
1389 if (!strcmp(OPT_STRING_VAL(MODE), "sb")) {
1390 audiod_status = AUDIOD_STANDBY;
1393 if (!strcmp(OPT_STRING_VAL(MODE), "off")) {
1394 audiod_status = AUDIOD_OFF;
1397 if (strcmp(OPT_STRING_VAL(MODE), "on"))
1398 PARA_WARNING_LOG("invalid mode\n");
1402 * Lookup the given UID in the whitelist.
1404 * The whitelist is the array of arguments to the --user-allow opion. If the
1405 * option was not given, the array is empty, in which case the check succeeds.
1407 * \param uid User ID to look up.
1409 * \return True if --user-allow was not given, or if uid matches an element of
1412 bool uid_is_whitelisted(uid_t uid)
1416 if (!OPT_GIVEN(USER_ALLOW))
1418 for (i = 0; i < OPT_GIVEN(USER_ALLOW); i++)
1419 if (uid == uid_whitelist[i])
1424 static void handle_help_flags(void)
1427 bool d = OPT_GIVEN(DETAILED_HELP);
1430 help = lls_long_help(CMD_PTR);
1431 else if (OPT_GIVEN(HELP))
1432 help = lls_short_help(CMD_PTR);
1435 printf("%s\n", help);
1437 print_receiver_helps(d);
1438 print_filter_helps(d);
1439 print_writer_helps(d);
1444 * the main function of para_audiod
1446 * \param argc usual argument count
1447 * \param argv usual argument vector
1449 * \return EXIT_SUCCESS or EXIT_FAILURE
1451 * \sa para_audiod(1)
1453 int main(int argc, char *argv[])
1456 struct command_task command_task_struct, *cmd_task = &command_task_struct;
1460 ret = lls(lls_parse(argc, argv, CMD_PTR, &lpr, &errctx));
1463 daemon_set_loglevel(OPT_UINT32_VAL(LOGLEVEL));
1464 daemon_drop_privileges_or_die(OPT_STRING_VAL(USER),
1465 OPT_STRING_VAL(GROUP));
1466 version_handle_flag("audiod", OPT_GIVEN(VERSION));
1467 handle_help_flags();
1468 parse_config_or_die();
1470 daemon_set_priority(OPT_UINT32_VAL(PRIORITY));
1471 if (daemon_init_colors_or_die(OPT_UINT32_VAL(COLOR), COLOR_AUTO,
1472 COLOR_NO, OPT_GIVEN(LOGFILE))) {
1473 for (i = 0; i < OPT_GIVEN(LOG_COLOR); i++)
1474 daemon_set_log_color_or_die(lls_string_val(i,
1475 OPT_RESULT(LOG_COLOR)));
1477 daemon_set_flag(DF_LOG_TIME);
1478 daemon_set_flag(DF_LOG_HOSTNAME);
1479 daemon_set_flag(DF_LOG_LL);
1480 if (OPT_GIVEN(LOG_TIMING))
1481 daemon_set_flag(DF_LOG_TIMING);
1482 if (OPT_GIVEN(LOGFILE)) {
1483 daemon_set_logfile(OPT_STRING_VAL(LOGFILE));
1484 daemon_open_log_or_die();
1486 ret = parse_stream_args();
1488 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1491 daemon_log_welcome("audiod");
1492 daemon_set_start_time();
1493 set_initial_status();
1496 setup_signal_handling();
1498 init_status_task(stat_task);
1499 init_command_task(cmd_task);
1501 if (OPT_GIVEN(DAEMON))
1502 daemonize(false /* parent exits immediately */);
1504 signal_task->task = task_register(&(struct task_info) {
1506 .pre_monitor = signal_pre_monitor,
1507 .post_monitor = signal_post_monitor,
1508 .context = signal_task,
1511 sched.default_timeout = 2999;
1512 ret = schedule(&sched);
1514 sched_shutdown(&sched);
1515 signal_shutdown(signal_task);
1518 lls_free_parse_result(lpr, CMD_PTR);
1520 PARA_ERROR_LOG("%s\n", errctx);
1522 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1523 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;