2 * This file is part of DisOrder.
3 * Copyright (C) 2007-2009, 2011, 2013 Richard Kettlewell
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
18 /** @file clients/playrtp.c
21 * This player supports Linux (<a href="http://www.alsa-project.org/">ALSA</a>)
23 * href="http://developer.apple.com/audio/coreaudio.html">Core Audio</a>)
24 * systems. There is no support for Microsoft Windows yet, and that will in
25 * fact probably an entirely separate program.
27 * The program runs (at least) three threads:
29 * listen_thread() is responsible for reading RTP packets off the wire and
30 * adding them to the linked list @ref received_packets, assuming they are
33 * queue_thread() takes packets off this linked list and adds them to @ref
34 * packets (an operation which might be much slower due to contention for @ref
37 * control_thread() accepts commands from Disobedience (or anything else).
39 * The main thread activates and deactivates audio playing via the @ref
40 * lib/uaudio.h API (which probably implies at least one further thread).
42 * Sometimes it happens that there is no audio available to play. This may
43 * because the server went away, or a packet was dropped, or the server
44 * deliberately did not send any sound because it encountered a silence.
47 * - it is safe to read uint32_t values without a lock protecting them
53 #include <sys/socket.h>
54 #include <sys/types.h>
55 #include <sys/socket.h>
61 #include <netinet/in.h>
68 #include <arpa/inet.h>
74 #include "configuration.h"
85 #include "inputline.h"
89 /** @brief Obsolete synonym */
90 #ifndef IPV6_JOIN_GROUP
91 # define IPV6_JOIN_GROUP IPV6_ADD_MEMBERSHIP
94 /** @brief RTP socket */
97 /** @brief Log output */
100 /** @brief Output device */
102 /** @brief Buffer low watermark in samples */
105 /** @brief Maximum buffer size in samples
107 * We'll stop reading from the network if we have this many samples.
109 static unsigned maxbuffer;
111 /** @brief Received packets
112 * Protected by @ref receive_lock
114 * Received packets are added to this list, and queue_thread() picks them off
115 * it and adds them to @ref packets. Whenever a packet is added to it, @ref
116 * receive_cond is signalled.
118 struct packet *received_packets;
120 /** @brief Tail of @ref received_packets
121 * Protected by @ref receive_lock
123 struct packet **received_tail = &received_packets;
125 /** @brief Lock protecting @ref received_packets
127 * Only listen_thread() and queue_thread() ever hold this lock. It is vital
128 * that queue_thread() not hold it any longer than it strictly has to. */
129 pthread_mutex_t receive_lock = PTHREAD_MUTEX_INITIALIZER;
131 /** @brief Condition variable signalled when @ref received_packets is updated
133 * Used by listen_thread() to notify queue_thread() that it has added another
134 * packet to @ref received_packets. */
135 pthread_cond_t receive_cond = PTHREAD_COND_INITIALIZER;
137 /** @brief Length of @ref received_packets */
140 /** @brief Binary heap of received packets */
141 struct pheap packets;
143 /** @brief Total number of samples available
145 * We make this volatile because we inspect it without a protecting lock,
146 * so the usual pthread_* guarantees aren't available.
148 volatile uint32_t nsamples;
150 /** @brief Timestamp of next packet to play.
152 * This is set to the timestamp of the last packet, plus the number of
153 * samples it contained. Only valid if @ref active is nonzero.
155 uint32_t next_timestamp;
157 /** @brief True if actively playing
159 * This is true when playing and false when just buffering. */
162 /** @brief Lock protecting @ref packets */
163 pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
165 /** @brief Condition variable signalled whenever @ref packets is changed */
166 pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
168 /** @brief Backend to play with */
169 static const struct uaudio *backend;
171 HEAP_DEFINE(pheap, struct packet *, lt_packet);
173 /** @brief Control socket or NULL */
174 const char *control_socket;
176 /** @brief Buffer for debugging dump
178 * The debug dump is enabled by the @c --dump option. It records the last 20s
179 * of audio to the specified file (which will be about 3.5Mbytes). The file is
180 * written as as ring buffer, so the start point will progress through it.
182 * Use clients/dump2wav to convert this to a WAV file, which can then be loaded
183 * into (e.g.) Audacity for further inspection.
185 * All three backends (ALSA, OSS, Core Audio) now support this option.
187 * The idea is to allow the user a few seconds to react to an audible artefact.
189 int16_t *dump_buffer;
191 /** @brief Current index within debugging dump */
194 /** @brief Size of debugging dump in samples */
195 size_t dump_size = 44100/*Hz*/ * 2/*channels*/ * 20/*seconds*/;
197 static const struct option options[] = {
198 { "help", no_argument, 0, 'h' },
199 { "version", no_argument, 0, 'V' },
200 { "debug", no_argument, 0, 'd' },
201 { "device", required_argument, 0, 'D' },
202 { "min", required_argument, 0, 'm' },
203 { "max", required_argument, 0, 'x' },
204 { "rcvbuf", required_argument, 0, 'R' },
205 #if HAVE_SYS_SOUNDCARD_H || EMPEG_HOST
206 { "oss", no_argument, 0, 'o' },
208 #if HAVE_ALSA_ASOUNDLIB_H
209 { "alsa", no_argument, 0, 'a' },
211 #if HAVE_COREAUDIO_AUDIOHARDWARE_H
212 { "core-audio", no_argument, 0, 'c' },
214 { "api", required_argument, 0, 'A' },
215 { "dump", required_argument, 0, 'r' },
216 { "command", required_argument, 0, 'e' },
217 { "pause-mode", required_argument, 0, 'P' },
218 { "socket", required_argument, 0, 's' },
219 { "config", required_argument, 0, 'C' },
220 { "monitor", no_argument, 0, 'M' },
224 /** @brief Control thread
226 * This thread is responsible for accepting control commands from Disobedience
227 * (or other controllers) over an AF_UNIX stream socket with a path specified
228 * by the @c --socket option. The protocol uses simple string commands and
231 * - @c stop will shut the player down
232 * - @c query will send back the reply @c running
233 * - anything else is ignored
235 * Commands and response strings terminated by shutting down the connection or
236 * by a newline. No attempt is made to multiplex multiple clients so it is
237 * important that the command be sent as soon as the connection is made - it is
238 * assumed that both parties to the protocol are entirely cooperating with one
241 static void *control_thread(void attribute((unused)) *arg) {
242 struct sockaddr_un sa;
249 assert(control_socket);
250 unlink(control_socket);
251 memset(&sa, 0, sizeof sa);
252 sa.sun_family = AF_UNIX;
253 strcpy(sa.sun_path, control_socket);
254 sfd = xsocket(PF_UNIX, SOCK_STREAM, 0);
255 if(bind(sfd, (const struct sockaddr *)&sa, sizeof sa) < 0)
256 disorder_fatal(errno, "error binding to %s", control_socket);
257 if(listen(sfd, 128) < 0)
258 disorder_fatal(errno, "error calling listen on %s", control_socket);
259 disorder_info("listening on %s", control_socket);
262 cfd = accept(sfd, (struct sockaddr *)&sa, &salen);
269 disorder_fatal(errno, "error calling accept on %s", control_socket);
272 if(!(fp = fdopen(cfd, "r+"))) {
273 disorder_error(errno, "error calling fdopen for %s connection", control_socket);
277 if(!inputline(control_socket, fp, &line, '\n')) {
278 if(!strcmp(line, "stop")) {
279 disorder_info("stopped via %s", control_socket);
280 exit(0); /* terminate immediately */
281 } else if(!strcmp(line, "query"))
282 fprintf(fp, "running");
283 else if(!strcmp(line, "getvol")) {
284 if(backend->get_volume) backend->get_volume(&vl, &vr);
286 fprintf(fp, "%d %d\n", vl, vr);
287 } else if(!strncmp(line, "setvol ", 7)) {
288 if(!backend->set_volume)
290 else if(sscanf(line + 7, "%d %d", &vl, &vr) == 2)
291 backend->set_volume(&vl, &vr);
293 backend->get_volume(&vl, &vr);
294 fprintf(fp, "%d %d\n", vl, vr);
299 disorder_error(errno, "error closing %s connection", control_socket);
303 /** @brief Drop the first packet
305 * Assumes that @ref lock is held.
307 static void drop_first_packet(void) {
308 if(pheap_count(&packets)) {
309 struct packet *const p = pheap_remove(&packets);
310 nsamples -= p->nsamples;
311 playrtp_free_packet(p);
312 pthread_cond_broadcast(&cond);
316 /** @brief Background thread adding packets to heap
318 * This just transfers packets from @ref received_packets to @ref packets. It
319 * is important that it holds @ref receive_lock for as little time as possible,
320 * in order to minimize the interval between calls to read() in
323 static void *queue_thread(void attribute((unused)) *arg) {
327 /* Get the next packet */
328 pthread_mutex_lock(&receive_lock);
329 while(!received_packets) {
330 pthread_cond_wait(&receive_cond, &receive_lock);
332 p = received_packets;
333 received_packets = p->next;
334 if(!received_packets)
335 received_tail = &received_packets;
337 pthread_mutex_unlock(&receive_lock);
338 /* Add it to the heap */
339 pthread_mutex_lock(&lock);
340 pheap_insert(&packets, p);
341 nsamples += p->nsamples;
342 pthread_cond_broadcast(&cond);
343 pthread_mutex_unlock(&lock);
345 #if HAVE_STUPID_GCC44
350 /** @brief Background thread collecting samples
352 * This function collects samples, perhaps converts them to the target format,
353 * and adds them to the packet list.
355 * It is crucial that the gap between successive calls to read() is as small as
356 * possible: otherwise packets will be dropped.
358 * We use a binary heap to ensure that the unavoidable effort is at worst
359 * logarithmic in the total number of packets - in fact if packets are mostly
360 * received in order then we will largely do constant work per packet since the
361 * newest packet will always be last.
363 * Of more concern is that we must acquire the lock on the heap to add a packet
364 * to it. If this proves a problem in practice then the answer would be
365 * (probably doubly) linked list with new packets added the end and a second
366 * thread which reads packets off the list and adds them to the heap.
368 * We keep memory allocation (mostly) very fast by keeping pre-allocated
369 * packets around; see @ref playrtp_new_packet().
371 static void *listen_thread(void attribute((unused)) *arg) {
372 struct packet *p = 0;
374 struct rtp_header header;
381 p = playrtp_new_packet();
382 iov[0].iov_base = &header;
383 iov[0].iov_len = sizeof header;
384 iov[1].iov_base = p->samples_raw;
385 iov[1].iov_len = sizeof p->samples_raw / sizeof *p->samples_raw;
386 n = readv(rtpfd, iov, 2);
392 disorder_fatal(errno, "error reading from socket");
395 /* Ignore too-short packets */
396 if((size_t)n <= sizeof (struct rtp_header)) {
397 disorder_info("ignored a short packet");
400 timestamp = htonl(header.timestamp);
401 seq = htons(header.seq);
402 /* Ignore packets in the past */
403 if(active && lt(timestamp, next_timestamp)) {
404 disorder_info("dropping old packet, timestamp=%"PRIx32" < %"PRIx32,
405 timestamp, next_timestamp);
408 /* Ignore packets with the extension bit set. */
409 if(header.vpxcc & 0x10)
413 p->timestamp = timestamp;
414 /* Convert to target format */
415 if(header.mpt & 0x80)
417 switch(header.mpt & 0x7F) {
419 p->nsamples = (n - sizeof header) / sizeof(uint16_t);
421 /* TODO support other RFC3551 media types (when the speaker does) */
423 disorder_fatal(0, "unsupported RTP payload type %d", header.mpt & 0x7F);
425 /* See if packet is silent */
426 const uint16_t *s = p->samples_raw;
434 fprintf(logfp, "sequence %u timestamp %"PRIx32" length %"PRIx32" end %"PRIx32"\n",
435 seq, timestamp, p->nsamples, timestamp + p->nsamples);
436 /* Stop reading if we've reached the maximum.
438 * This is rather unsatisfactory: it means that if packets get heavily
439 * out of order then we guarantee dropouts. But for now... */
440 if(nsamples >= maxbuffer) {
441 pthread_mutex_lock(&lock);
442 while(nsamples >= maxbuffer) {
443 pthread_cond_wait(&cond, &lock);
445 pthread_mutex_unlock(&lock);
447 /* Add the packet to the receive queue */
448 pthread_mutex_lock(&receive_lock);
450 received_tail = &p->next;
452 pthread_cond_signal(&receive_cond);
453 pthread_mutex_unlock(&receive_lock);
454 /* We'll need a new packet */
459 /** @brief Wait until the buffer is adequately full
461 * Must be called with @ref lock held.
463 void playrtp_fill_buffer(void) {
464 /* Discard current buffer contents */
466 //fprintf(stderr, "%8u/%u (%u) DROPPING\n", nsamples, maxbuffer, minbuffer);
469 disorder_info("Buffering...");
470 /* Wait until there's at least minbuffer samples available */
471 while(nsamples < minbuffer) {
472 //fprintf(stderr, "%8u/%u (%u) FILLING\n", nsamples, maxbuffer, minbuffer);
473 pthread_cond_wait(&cond, &lock);
475 /* Start from whatever is earliest */
476 next_timestamp = pheap_first(&packets)->timestamp;
480 /** @brief Find next packet
481 * @return Packet to play or NULL if none found
483 * The return packet is merely guaranteed not to be in the past: it might be
484 * the first packet in the future rather than one that is actually suitable to
487 * Must be called with @ref lock held.
489 struct packet *playrtp_next_packet(void) {
490 while(pheap_count(&packets)) {
491 struct packet *const p = pheap_first(&packets);
492 if(le(p->timestamp + p->nsamples, next_timestamp)) {
493 /* This packet is in the past. Drop it and try another one. */
496 /* This packet is NOT in the past. (It might be in the future
503 /* display usage message and terminate */
504 static void attribute((noreturn)) help(void) {
506 " disorder-playrtp [OPTIONS] [[ADDRESS] PORT]\n"
508 " --device, -D DEVICE Output device\n"
509 " --min, -m FRAMES Buffer low water mark\n"
510 " --max, -x FRAMES Buffer maximum size\n"
511 " --rcvbuf, -R BYTES Socket receive buffer size\n"
512 " --config, -C PATH Set configuration file\n"
513 " --api, -A API Select audio API. Possibilities:\n"
516 for(int n = 0; uaudio_apis[n]; ++n) {
517 if(uaudio_apis[n]->flags & UAUDIO_API_CLIENT) {
522 xprintf("%s", uaudio_apis[n]->name);
526 " --command, -e COMMAND Pipe audio to command.\n"
527 " --pause-mode, -P silence For -e: pauses send silence (default)\n"
528 " --pause-mode, -P suspend For -e: pauses suspend writes\n"
529 " --help, -h Display usage message\n"
530 " --version, -V Display version number\n"
536 static size_t playrtp_callback(void *buffer,
538 void attribute((unused)) *userdata) {
542 pthread_mutex_lock(&lock);
543 /* Get the next packet, junking any that are now in the past */
544 const struct packet *p = playrtp_next_packet();
545 if(p && contains(p, next_timestamp)) {
546 /* This packet is ready to play; the desired next timestamp points
547 * somewhere into it. */
549 /* Timestamp of end of packet */
550 const uint32_t packet_end = p->timestamp + p->nsamples;
552 /* Offset of desired next timestamp into current packet */
553 const uint32_t offset = next_timestamp - p->timestamp;
555 /* Pointer to audio data */
556 const uint16_t *ptr = (void *)(p->samples_raw + offset);
558 /* Compute number of samples left in packet, limited to output buffer
560 samples = packet_end - next_timestamp;
561 if(samples > max_samples)
562 samples = max_samples;
564 /* Copy into buffer, converting to native endianness */
566 int16_t *bufptr = buffer;
568 *bufptr++ = (int16_t)ntohs(*ptr++);
571 silent = !!(p->flags & SILENT);
573 /* There is no suitable packet. We introduce 0s up to the next packet, or
574 * to fill the buffer if there's no next packet or that's too many. The
575 * comparison with max_samples deals with the otherwise troubling overflow
577 samples = p ? p->timestamp - next_timestamp : max_samples;
578 if(samples > max_samples)
579 samples = max_samples;
580 //info("infill by %zu", samples);
581 memset(buffer, 0, samples * uaudio_sample_size);
586 for(size_t i = 0; i < samples; ++i) {
587 dump_buffer[dump_index++] = ((int16_t *)buffer)[i];
588 dump_index %= dump_size;
591 /* Advance timestamp */
592 next_timestamp += samples;
593 /* If we're getting behind then try to drop just silent packets
595 * In theory this shouldn't be necessary. The server is supposed to send
596 * packets at the right rate and compares the number of samples sent with the
597 * time in order to ensure this.
599 * However, various things could throw this off:
601 * - the server's clock could advance at the wrong rate. This would cause it
602 * to mis-estimate the right number of samples to have sent and
603 * inappropriately throttle or speed up.
605 * - playback could happen at the wrong rate. If the playback host's sound
606 * card has a slightly incorrect clock then eventually it will get out
609 * So if we play back slightly slower than the server sends for either of
610 * these reasons then eventually our buffer, and the socket's buffer, will
611 * fill, and the kernel will start dropping packets. The result is audible
614 * Therefore if we're getting behind, we pre-emptively drop silent packets,
615 * since a change in the duration of a silence is less noticeable than a
616 * dropped packet from the middle of continuous music.
618 * (If things go wrong the other way then eventually we run out of packets to
619 * play and are forced to play silence. This doesn't seem to happen in
620 * practice but if it does then in the same way we can artificially extend
621 * silent packets to compensate.)
623 * Dropped packets are always logged; use 'disorder-playrtp --monitor' to
624 * track how close to target buffer occupancy we are on a once-a-minute
627 if(nsamples > minbuffer && silent) {
628 disorder_info("dropping %zu samples (%"PRIu32" > %"PRIu32")",
629 samples, nsamples, minbuffer);
632 /* Junk obsolete packets */
633 playrtp_next_packet();
634 pthread_mutex_unlock(&lock);
638 static int compare_family(const struct ifaddrs *a,
639 const struct ifaddrs *b,
641 int afamily = a->ifa_addr->sa_family;
642 int bfamily = b->ifa_addr->sa_family;
643 if(afamily != bfamily) {
644 /* Preferred family wins */
645 if(afamily == family) return 1;
646 if(bfamily == family) return -1;
647 /* Either there's no preference or it doesn't help. Prefer IPv4 */
648 if(afamily == AF_INET) return 1;
649 if(bfamily == AF_INET) return -1;
650 /* Failing that prefer IPv6 */
651 if(afamily == AF_INET6) return 1;
652 if(bfamily == AF_INET6) return -1;
657 static int compare_flags(const struct ifaddrs *a,
658 const struct ifaddrs *b) {
659 unsigned aflags = a->ifa_flags, bflags = b->ifa_flags;
660 /* Up interfaces are better than down ones */
661 unsigned aup = aflags & IFF_UP, bup = bflags & IFF_UP;
663 return aup > bup ? 1 : -1;
665 /* Static addresses are better than dynamic */
666 unsigned adynamic = aflags & IFF_DYNAMIC, bdynamic = bflags & IFF_DYNAMIC;
667 if(adynamic != bdynamic)
668 return adynamic < bdynamic ? 1 : -1;
670 unsigned aloopback = aflags & IFF_LOOPBACK, bloopback = bflags & IFF_LOOPBACK;
671 /* Static addresses are better than dynamic */
672 if(aloopback != bloopback)
673 return aloopback < bloopback ? 1 : -1;
677 static int compare_interfaces(const struct ifaddrs *a,
678 const struct ifaddrs *b,
681 if((c = compare_family(a, b, family))) return c;
682 return compare_flags(a, b);
685 int main(int argc, char **argv) {
687 struct addrinfo *res;
688 struct stringlist sl;
690 int rcvbuf, target_rcvbuf = -1;
693 struct ipv6_mreq mreq6;
694 disorder_client *c = NULL;
695 char *address, *port;
699 struct sockaddr_in in;
700 struct sockaddr_in6 in6;
702 union any_sockaddr mgroup;
703 const char *dumpfile = 0;
706 static const int one = 1;
708 struct addrinfo prefs = {
709 .ai_flags = AI_PASSIVE,
710 .ai_family = PF_INET,
711 .ai_socktype = SOCK_DGRAM,
712 .ai_protocol = IPPROTO_UDP
715 /* Timing information is often important to debugging playrtp, so we include
716 * timestamps in the logs */
719 if(!setlocale(LC_CTYPE, "")) disorder_fatal(errno, "error calling setlocale");
720 while((n = getopt_long(argc, argv, "hVdD:m:x:L:R:aocC:re:P:MA:", options, 0)) >= 0) {
723 case 'V': version("disorder-playrtp");
724 case 'd': debugging = 1; break;
725 case 'D': uaudio_set("device", optarg); break;
726 case 'm': minbuffer = 2 * atol(optarg); break;
727 case 'x': maxbuffer = 2 * atol(optarg); break;
728 case 'L': logfp = fopen(optarg, "w"); break;
729 case 'R': target_rcvbuf = atoi(optarg); break;
730 #if HAVE_ALSA_ASOUNDLIB_H
732 disorder_error(0, "deprecated option; use --api alsa instead");
733 backend = &uaudio_alsa; break;
735 #if HAVE_SYS_SOUNDCARD_H || EMPEG_HOST
737 disorder_error(0, "deprecated option; use --api oss instead");
738 backend = &uaudio_oss;
741 #if HAVE_COREAUDIO_AUDIOHARDWARE_H
743 disorder_error(0, "deprecated option; use --api coreaudio instead");
744 backend = &uaudio_coreaudio;
747 case 'A': backend = uaudio_find(optarg); break;
748 case 'C': configfile = optarg; break;
749 case 's': control_socket = optarg; break;
750 case 'r': dumpfile = optarg; break;
751 case 'e': backend = &uaudio_command; uaudio_set("command", optarg); break;
752 case 'P': uaudio_set("pause-mode", optarg); break;
753 case 'M': monitor = 1; break;
754 default: disorder_fatal(0, "invalid option");
757 if(config_read(0, NULL)) disorder_fatal(0, "cannot read configuration");
758 /* Choose a sensible default audio backend */
760 backend = uaudio_default(uaudio_apis, UAUDIO_API_CLIENT);
762 disorder_fatal(0, "no default uaudio API found");
763 disorder_info("default audio API %s", backend->name);
765 if(backend == &uaudio_rtp) {
766 /* This means that you have NO local sound output. This can happen if you
767 * use a non-Apple GCC on a Mac (because it doesn't know how to compile
768 * CoreAudio/AudioHardware.h). */
769 disorder_fatal(0, "cannot play RTP through RTP");
771 /* Set buffering parameters if not overridden */
773 minbuffer = config->rtp_minbuffer;
774 if(!minbuffer) minbuffer = (2*44100)*4/10;
777 maxbuffer = config->rtp_maxbuffer;
778 if(!maxbuffer) maxbuffer = 2 * minbuffer;
780 if(target_rcvbuf < 0) target_rcvbuf = config->rtp_rcvbuf;
785 sl.s = xcalloc(3, sizeof *sl.s);
786 if(config->rtp_always_request) {
787 sl.s[0] = sl.s[1] = (/*unconst*/ char *)"-";
790 /* Get configuration from server */
791 if(!(c = disorder_new(1))) exit(EXIT_FAILURE);
792 if(disorder_connect(c)) exit(EXIT_FAILURE);
793 if(disorder_rtp_address(c, &address, &port)) exit(EXIT_FAILURE);
798 /* If we're requesting a new stream then apply the local network address
801 if(!strcmp(sl.s[0], "-")) {
802 if(config->rtp_request_address.port)
803 byte_xasprintf(&sl.s[1], "%d", config->rtp_request_address.port);
804 if(config->rtp_request_address.address) {
806 sl.s[1] = config->rtp_request_address.address;
811 case 1: case 2: case 3:
812 /* Use command-line ADDRESS+PORT or just PORT */
817 disorder_fatal(0, "usage: disorder-playrtp [OPTIONS] [[ADDRESS] PORT]");
819 disorder_info("version "VERSION" process ID %lu",
820 (unsigned long)getpid());
821 struct sockaddr *addr;
823 if(!strcmp(sl.s[0], "-")) {
824 /* Syntax: - [[ADDRESS] PORT]. Here, the PORT may be `-' to get the local
825 * kernel to choose. The ADDRESS may be omitted or `-' to pick something
827 const char *node, *svc;
828 struct sockaddr *sa = 0;
830 #define NULLDASH(s) (strcmp((s), "-") ? (s) : 0)
831 case 1: node = 0; svc = 0; break;
832 case 2: node = 0; svc = NULLDASH(sl.s[1]); break;
833 case 3: node = NULLDASH(sl.s[1]); svc = NULLDASH(sl.s[2]); break;
834 default: disorder_fatal(0, "too many listening-address compoennts");
837 /* We'll need a connection to request the incoming stream, so open one if
838 * we don't have one already */
840 if(!(c = disorder_new(1))) exit(EXIT_FAILURE);
841 if(disorder_connect(c)) exit(EXIT_FAILURE);
843 /* If no address was given, pick something sensible based on the known-
844 * working connectivity to the server */
846 int family = config->rtp_request_address.af;
847 if(family == AF_UNSPEC) family = disorder_client_af(c);
848 /* Get a list of interfaces */
849 struct ifaddrs *ifa, *bestifa = NULL;
850 if(getifaddrs(&ifa) < 0)
851 disorder_fatal(errno, "error calling getifaddrs");
852 /* Try to pick a good one */
853 for(; ifa; ifa = ifa->ifa_next) {
854 if(!ifa->ifa_addr) continue;
856 || compare_interfaces(ifa, bestifa, family) > 0)
860 disorder_fatal(0, "failed to select a network interface");
861 sa = bestifa->ifa_addr;
862 switch(sa->sa_family) {
863 case AF_INET: ((struct sockaddr_in *)sa)->sin_port = 0; break;
864 case AF_INET6: ((struct sockaddr_in6 *)sa)->sin6_port = 0; break;
865 default: assert(!"unexpected address family");
867 prefs.ai_family = sa->sa_family;
869 /* If we have an address or port to resolve then do that now */
874 if((rc = getaddrinfo(node, svc, &prefs, &ai)))
875 disorder_fatal(0, "failed to resolve address `%s' and service `%s': %s",
876 node ? node : "-", svc ? svc : "-",
877 format_error(ec_getaddrinfo, rc,
878 errbuf, sizeof(errbuf)));
882 assert(sa->sa_family == ai->ai_addr->sa_family);
883 switch(sa->sa_family) {
885 ((struct sockaddr_in *)sa)->sin_port =
886 ((struct sockaddr_in *)ai->ai_addr)->sin_port;
889 ((struct sockaddr_in6 *)sa)->sin6_port =
890 ((struct sockaddr_in6 *)ai->ai_addr)->sin6_port;
893 assert(!"unexpected address family");
897 if((rtpfd = socket(sa->sa_family, SOCK_DGRAM, IPPROTO_UDP)) < 0)
898 disorder_fatal(errno, "error creating socket (family %d)",
900 /* Bind the address */
902 sa->sa_family == AF_INET
903 ? sizeof (struct sockaddr_in) : sizeof (struct sockaddr_in6)) < 0)
904 disorder_fatal(errno, "error binding socket");
905 static struct sockaddr_storage bound_address;
906 addr = (struct sockaddr *)&bound_address;
907 addr_len = sizeof bound_address;
908 if(getsockname(rtpfd, addr, &addr_len) < 0)
909 disorder_fatal(errno, "error getting socket address");
910 /* Convert to string */
911 char addrname[128], portname[32];
912 if(getnameinfo(addr, addr_len,
913 addrname, sizeof addrname,
914 portname, sizeof portname,
915 NI_NUMERICHOST|NI_NUMERICSERV) < 0)
916 disorder_fatal(errno, "getnameinfo");
917 /* Ask for audio data */
918 if(disorder_rtp_request(c, addrname, portname)) exit(EXIT_FAILURE);
919 /* Report what we did */
920 disorder_info("listening on %s (stream requested)",
921 format_sockaddr(addr));
923 if(sl.n > 2) disorder_fatal(0, "too many address components");
924 /* Look up address and port */
925 if(!(res = get_address(&sl, &prefs, &sockname)))
928 addr_len = res->ai_addrlen;
929 /* Create the socket */
930 if((rtpfd = socket(res->ai_family,
932 res->ai_protocol)) < 0)
933 disorder_fatal(errno, "error creating socket");
934 /* Allow multiple listeners */
935 xsetsockopt(rtpfd, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
936 is_multicast = multicast(addr);
937 /* The multicast and unicast/broadcast cases are different enough that they
938 * are totally split. Trying to find commonality between them causes more
939 * trouble that it's worth. */
941 /* Stash the multicast group address */
942 memcpy(&mgroup, addr, addr_len);
943 switch(res->ai_addr->sa_family) {
945 mgroup.in.sin_port = 0;
948 mgroup.in6.sin6_port = 0;
951 disorder_fatal(0, "unsupported address family %d",
952 (int)addr->sa_family);
954 /* Bind to to the multicast group address */
955 if(bind(rtpfd, addr, addr_len) < 0)
956 disorder_fatal(errno, "error binding socket to %s",
957 format_sockaddr(addr));
958 /* Add multicast group membership */
959 switch(mgroup.sa.sa_family) {
961 mreq.imr_multiaddr = mgroup.in.sin_addr;
962 mreq.imr_interface.s_addr = 0; /* use primary interface */
963 if(setsockopt(rtpfd, IPPROTO_IP, IP_ADD_MEMBERSHIP,
964 &mreq, sizeof mreq) < 0)
965 disorder_fatal(errno, "error calling setsockopt IP_ADD_MEMBERSHIP");
968 mreq6.ipv6mr_multiaddr = mgroup.in6.sin6_addr;
969 memset(&mreq6.ipv6mr_interface, 0, sizeof mreq6.ipv6mr_interface);
970 if(setsockopt(rtpfd, IPPROTO_IPV6, IPV6_JOIN_GROUP,
971 &mreq6, sizeof mreq6) < 0)
972 disorder_fatal(errno, "error calling setsockopt IPV6_JOIN_GROUP");
975 disorder_fatal(0, "unsupported address family %d", res->ai_family);
977 /* Report what we did */
978 disorder_info("listening on %s multicast group %s",
979 format_sockaddr(addr), format_sockaddr(&mgroup.sa));
982 switch(addr->sa_family) {
984 struct sockaddr_in *in = (struct sockaddr_in *)addr;
986 memset(&in->sin_addr, 0, sizeof (struct in_addr));
990 struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)addr;
992 memset(&in6->sin6_addr, 0, sizeof (struct in6_addr));
996 disorder_fatal(0, "unsupported family %d", (int)addr->sa_family);
998 if(bind(rtpfd, addr, addr_len) < 0)
999 disorder_fatal(errno, "error binding socket to %s",
1000 format_sockaddr(addr));
1001 /* Report what we did */
1002 disorder_info("listening on %s", format_sockaddr(addr));
1005 len = sizeof rcvbuf;
1006 if(getsockopt(rtpfd, SOL_SOCKET, SO_RCVBUF, &rcvbuf, &len) < 0)
1007 disorder_fatal(errno, "error calling getsockopt SO_RCVBUF");
1008 if(target_rcvbuf > rcvbuf) {
1009 if(setsockopt(rtpfd, SOL_SOCKET, SO_RCVBUF,
1010 &target_rcvbuf, sizeof target_rcvbuf) < 0)
1011 disorder_error(errno, "error calling setsockopt SO_RCVBUF %d",
1013 /* We try to carry on anyway */
1015 disorder_info("changed socket receive buffer from %d to %d",
1016 rcvbuf, target_rcvbuf);
1018 disorder_info("default socket receive buffer %d", rcvbuf);
1019 //info("minbuffer %u maxbuffer %u", minbuffer, maxbuffer);
1021 disorder_info("WARNING: -L option can impact performance");
1022 if(control_socket) {
1025 if((err = pthread_create(&tid, 0, control_thread, 0)))
1026 disorder_fatal(err, "pthread_create control_thread");
1030 unsigned char buffer[65536];
1033 if((fd = open(dumpfile, O_RDWR|O_TRUNC|O_CREAT, 0666)) < 0)
1034 disorder_fatal(errno, "opening %s", dumpfile);
1035 /* Fill with 0s to a suitable size */
1036 memset(buffer, 0, sizeof buffer);
1037 for(written = 0; written < dump_size * sizeof(int16_t);
1038 written += sizeof buffer) {
1039 if(write(fd, buffer, sizeof buffer) < 0)
1040 disorder_fatal(errno, "clearing %s", dumpfile);
1042 /* Map the buffer into memory for convenience */
1043 dump_buffer = mmap(0, dump_size * sizeof(int16_t), PROT_READ|PROT_WRITE,
1045 if(dump_buffer == (void *)-1)
1046 disorder_fatal(errno, "mapping %s", dumpfile);
1047 disorder_info("dumping to %s", dumpfile);
1049 /* Set up output. Currently we only support L16 so there's no harm setting
1050 * the format before we know what it is! */
1051 uaudio_set_format(44100/*Hz*/, 2/*channels*/,
1052 16/*bits/channel*/, 1/*signed*/);
1053 uaudio_set("application", "disorder-playrtp");
1054 backend->configure();
1055 backend->start(playrtp_callback, NULL);
1056 if(backend->open_mixer) backend->open_mixer();
1057 /* We receive and convert audio data in a background thread */
1058 if((err = pthread_create(<id, 0, listen_thread, 0)))
1059 disorder_fatal(err, "pthread_create listen_thread");
1060 /* We have a second thread to add received packets to the queue */
1061 if((err = pthread_create(<id, 0, queue_thread, 0)))
1062 disorder_fatal(err, "pthread_create queue_thread");
1063 pthread_mutex_lock(&lock);
1066 /* Wait for the buffer to fill up a bit */
1067 playrtp_fill_buffer();
1068 /* Start playing now */
1069 disorder_info("Playing...");
1070 next_timestamp = pheap_first(&packets)->timestamp;
1072 pthread_mutex_unlock(&lock);
1073 backend->activate();
1074 pthread_mutex_lock(&lock);
1075 /* Wait until the buffer empties out
1077 * If there's a packet that we can play right now then we definitely
1080 * Also if there's at least minbuffer samples we carry on regardless and
1081 * insert silence. The assumption is there's been a pause but more data
1084 while(nsamples >= minbuffer
1086 && contains(pheap_first(&packets), next_timestamp))) {
1088 time_t now = xtime(0);
1090 if(now >= lastlog + 60) {
1091 int offset = nsamples - minbuffer;
1092 double offtime = (double)offset / (uaudio_rate * uaudio_channels);
1093 disorder_info("%+d samples off (%d.%02ds, %d bytes)",
1095 (int)fabs(offtime) * (offtime < 0 ? -1 : 1),
1096 (int)(fabs(offtime) * 100) % 100,
1097 offset * uaudio_bits / CHAR_BIT);
1101 //fprintf(stderr, "%8u/%u (%u) PLAYING\n", nsamples, maxbuffer, minbuffer);
1102 pthread_cond_wait(&cond, &lock);
1106 struct packet *p = pheap_first(&packets);
1107 fprintf(stderr, "nsamples=%u (%u) next_timestamp=%"PRIx32", first packet is [%"PRIx32",%"PRIx32")\n",
1108 nsamples, minbuffer, next_timestamp,p->timestamp,p->timestamp+p->nsamples);
1111 /* Stop playing for a bit until the buffer re-fills */
1112 pthread_mutex_unlock(&lock);
1113 backend->deactivate();
1114 pthread_mutex_lock(&lock);
1126 indent-tabs-mode:nil