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 int main(int argc
, char **argv
) {
640 struct addrinfo
*res
;
641 struct stringlist sl
;
643 int rcvbuf
, target_rcvbuf
= -1;
646 struct ipv6_mreq mreq6
;
647 disorder_client
*c
= NULL
;
648 char *address
, *port
;
652 struct sockaddr_in in
;
653 struct sockaddr_in6 in6
;
655 union any_sockaddr mgroup
;
656 const char *dumpfile
= 0;
659 static const int one
= 1;
661 struct addrinfo prefs
= {
662 .ai_flags
= AI_PASSIVE
,
663 .ai_family
= PF_INET
,
664 .ai_socktype
= SOCK_DGRAM
,
665 .ai_protocol
= IPPROTO_UDP
668 /* Timing information is often important to debugging playrtp, so we include
669 * timestamps in the logs */
672 if(!setlocale(LC_CTYPE
, "")) disorder_fatal(errno
, "error calling setlocale");
673 while((n
= getopt_long(argc
, argv
, "hVdD:m:x:L:R:aocC:re:P:MA:", options
, 0)) >= 0) {
676 case 'V': version("disorder-playrtp");
677 case 'd': debugging
= 1; break;
678 case 'D': uaudio_set("device", optarg
); break;
679 case 'm': minbuffer
= 2 * atol(optarg
); break;
680 case 'x': maxbuffer
= 2 * atol(optarg
); break;
681 case 'L': logfp
= fopen(optarg
, "w"); break;
682 case 'R': target_rcvbuf
= atoi(optarg
); break;
683 #if HAVE_ALSA_ASOUNDLIB_H
685 disorder_error(0, "deprecated option; use --api alsa instead");
686 backend
= &uaudio_alsa
; break;
688 #if HAVE_SYS_SOUNDCARD_H || EMPEG_HOST
690 disorder_error(0, "deprecated option; use --api oss instead");
691 backend
= &uaudio_oss
;
694 #if HAVE_COREAUDIO_AUDIOHARDWARE_H
696 disorder_error(0, "deprecated option; use --api coreaudio instead");
697 backend
= &uaudio_coreaudio
;
700 case 'A': backend
= uaudio_find(optarg
); break;
701 case 'C': configfile
= optarg
; break;
702 case 's': control_socket
= optarg
; break;
703 case 'r': dumpfile
= optarg
; break;
704 case 'e': backend
= &uaudio_command
; uaudio_set("command", optarg
); break;
705 case 'P': uaudio_set("pause-mode", optarg
); break;
706 case 'M': monitor
= 1; break;
707 default: disorder_fatal(0, "invalid option");
710 if(config_read(0, NULL
)) disorder_fatal(0, "cannot read configuration");
711 /* Choose a sensible default audio backend */
713 backend
= uaudio_default(uaudio_apis
, UAUDIO_API_CLIENT
);
715 disorder_fatal(0, "no default uaudio API found");
716 disorder_info("default audio API %s", backend
->name
);
718 if(backend
== &uaudio_rtp
) {
719 /* This means that you have NO local sound output. This can happen if you
720 * use a non-Apple GCC on a Mac (because it doesn't know how to compile
721 * CoreAudio/AudioHardware.h). */
722 disorder_fatal(0, "cannot play RTP through RTP");
724 /* Set buffering parameters if not overridden */
726 minbuffer
= config
->rtp_minbuffer
;
727 if(!minbuffer
) minbuffer
= (2*44100)*4/10;
730 maxbuffer
= config
->rtp_maxbuffer
;
731 if(!maxbuffer
) maxbuffer
= 2 * minbuffer
;
733 if(target_rcvbuf
< 0) target_rcvbuf
= config
->rtp_rcvbuf
;
738 sl
.s
= xcalloc(3, sizeof *sl
.s
);
739 if(config
->rtp_always_request
) {
740 sl
.s
[0] = sl
.s
[1] = (/*unconst*/ char *)"-";
743 /* Get configuration from server */
744 if(!(c
= disorder_new(1))) exit(EXIT_FAILURE
);
745 if(disorder_connect(c
)) exit(EXIT_FAILURE
);
746 if(disorder_rtp_address(c
, &address
, &port
)) exit(EXIT_FAILURE
);
751 /* If we're requesting a new stream then apply the local network address
754 if(!strcmp(sl
.s
[0], "-")) {
755 if(config
->rtp_request_address
.port
)
756 byte_xasprintf(&sl
.s
[1], "%d", config
->rtp_request_address
.port
);
757 if(config
->rtp_request_address
.address
) {
759 sl
.s
[1] = config
->rtp_request_address
.address
;
764 case 1: case 2: case 3:
765 /* Use command-line ADDRESS+PORT or just PORT */
770 disorder_fatal(0, "usage: disorder-playrtp [OPTIONS] [[ADDRESS] PORT]");
772 disorder_info("version "VERSION
" process ID %lu",
773 (unsigned long)getpid());
774 struct sockaddr
*addr
;
776 if(!strcmp(sl
.s
[0], "-")) {
777 /* Syntax: - [[ADDRESS] PORT]. Here, the PORT may be `-' to get the local
778 * kernel to choose. The ADDRESS may be omitted or `-' to pick something
780 const char *node
, *svc
;
781 struct sockaddr
*sa
= 0;
783 #define NULLDASH(s) (strcmp((s), "-") ? (s) : 0)
784 case 1: node
= 0; svc
= 0; break;
785 case 2: node
= 0; svc
= NULLDASH(sl
.s
[1]); break;
786 case 3: node
= NULLDASH(sl
.s
[1]); svc
= NULLDASH(sl
.s
[2]); break;
787 default: disorder_fatal(0, "too many listening-address compoennts");
790 /* We'll need a connection to request the incoming stream, so open one if
791 * we don't have one already */
793 if(!(c
= disorder_new(1))) exit(EXIT_FAILURE
);
794 if(disorder_connect(c
)) exit(EXIT_FAILURE
);
796 /* If no address was given, we need to pick one. But we already have a
797 * connection to the server, so we can probably use the address from that.
799 struct sockaddr_storage ss
;
801 addr_len
= sizeof ss
;
802 if(disorder_client_sockname(c
, (struct sockaddr
*)&ss
, &addr_len
))
804 if(ss
.ss_family
!= AF_INET
&& ss
.ss_family
!= AF_INET6
) {
805 /* We're using a Unix-domain socket, so use a loopback address. I'm
806 * cowardly using IPv4 here. */
807 struct sockaddr_in
*sin
= (struct sockaddr_in
*)&ss
;
808 sin
->sin_family
= AF_INET
;
809 sin
->sin_addr
.s_addr
= htonl(INADDR_LOOPBACK
);
811 sa
= (struct sockaddr
*)&ss
;
812 prefs
.ai_family
= sa
->sa_family
;
814 /* If we have an address or port to resolve then do that now */
819 if((rc
= getaddrinfo(node
, svc
, &prefs
, &ai
)))
820 disorder_fatal(0, "failed to resolve address `%s' and service `%s': %s",
821 node ? node
: "-", svc ? svc
: "-",
822 format_error(ec_getaddrinfo
, rc
,
823 errbuf
, sizeof(errbuf
)));
827 assert(sa
->sa_family
== ai
->ai_addr
->sa_family
);
828 switch(sa
->sa_family
) {
830 ((struct sockaddr_in
*)sa
)->sin_port
=
831 ((struct sockaddr_in
*)ai
->ai_addr
)->sin_port
;
834 ((struct sockaddr_in6
*)sa
)->sin6_port
=
835 ((struct sockaddr_in6
*)ai
->ai_addr
)->sin6_port
;
838 assert(!"unexpected address family");
842 if((rtpfd
= socket(sa
->sa_family
, SOCK_DGRAM
, IPPROTO_UDP
)) < 0)
843 disorder_fatal(errno
, "error creating socket (family %d)",
845 /* Bind the address */
847 sa
->sa_family
== AF_INET
848 ?
sizeof (struct sockaddr_in
) : sizeof (struct sockaddr_in6
)) < 0)
849 disorder_fatal(errno
, "error binding socket");
850 static struct sockaddr_storage bound_address
;
851 addr
= (struct sockaddr
*)&bound_address
;
852 addr_len
= sizeof bound_address
;
853 if(getsockname(rtpfd
, addr
, &addr_len
) < 0)
854 disorder_fatal(errno
, "error getting socket address");
855 /* Convert to string */
856 char addrname
[128], portname
[32];
857 if(getnameinfo(addr
, addr_len
,
858 addrname
, sizeof addrname
,
859 portname
, sizeof portname
,
860 NI_NUMERICHOST
|NI_NUMERICSERV
) < 0)
861 disorder_fatal(errno
, "getnameinfo");
862 /* Ask for audio data */
863 if(disorder_rtp_request(c
, addrname
, portname
)) exit(EXIT_FAILURE
);
864 /* Report what we did */
865 disorder_info("listening on %s (stream requested)",
866 format_sockaddr(addr
));
868 if(sl
.n
> 2) disorder_fatal(0, "too many address components");
869 /* Look up address and port */
870 if(!(res
= get_address(&sl
, &prefs
, &sockname
)))
873 addr_len
= res
->ai_addrlen
;
874 /* Create the socket */
875 if((rtpfd
= socket(res
->ai_family
,
877 res
->ai_protocol
)) < 0)
878 disorder_fatal(errno
, "error creating socket");
879 /* Allow multiple listeners */
880 xsetsockopt(rtpfd
, SOL_SOCKET
, SO_REUSEADDR
, &one
, sizeof one
);
881 is_multicast
= multicast(addr
);
882 /* The multicast and unicast/broadcast cases are different enough that they
883 * are totally split. Trying to find commonality between them causes more
884 * trouble that it's worth. */
886 /* Stash the multicast group address */
887 memcpy(&mgroup
, addr
, addr_len
);
888 switch(res
->ai_addr
->sa_family
) {
890 mgroup
.in
.sin_port
= 0;
893 mgroup
.in6
.sin6_port
= 0;
896 disorder_fatal(0, "unsupported address family %d",
897 (int)addr
->sa_family
);
899 /* Bind to to the multicast group address */
900 if(bind(rtpfd
, addr
, addr_len
) < 0)
901 disorder_fatal(errno
, "error binding socket to %s",
902 format_sockaddr(addr
));
903 /* Add multicast group membership */
904 switch(mgroup
.sa
.sa_family
) {
906 mreq
.imr_multiaddr
= mgroup
.in
.sin_addr
;
907 mreq
.imr_interface
.s_addr
= 0; /* use primary interface */
908 if(setsockopt(rtpfd
, IPPROTO_IP
, IP_ADD_MEMBERSHIP
,
909 &mreq
, sizeof mreq
) < 0)
910 disorder_fatal(errno
, "error calling setsockopt IP_ADD_MEMBERSHIP");
913 mreq6
.ipv6mr_multiaddr
= mgroup
.in6
.sin6_addr
;
914 memset(&mreq6
.ipv6mr_interface
, 0, sizeof mreq6
.ipv6mr_interface
);
915 if(setsockopt(rtpfd
, IPPROTO_IPV6
, IPV6_JOIN_GROUP
,
916 &mreq6
, sizeof mreq6
) < 0)
917 disorder_fatal(errno
, "error calling setsockopt IPV6_JOIN_GROUP");
920 disorder_fatal(0, "unsupported address family %d", res
->ai_family
);
922 /* Report what we did */
923 disorder_info("listening on %s multicast group %s",
924 format_sockaddr(addr
), format_sockaddr(&mgroup
.sa
));
927 switch(addr
->sa_family
) {
929 struct sockaddr_in
*in
= (struct sockaddr_in
*)addr
;
931 memset(&in
->sin_addr
, 0, sizeof (struct in_addr
));
935 struct sockaddr_in6
*in6
= (struct sockaddr_in6
*)addr
;
937 memset(&in6
->sin6_addr
, 0, sizeof (struct in6_addr
));
941 disorder_fatal(0, "unsupported family %d", (int)addr
->sa_family
);
943 if(bind(rtpfd
, addr
, addr_len
) < 0)
944 disorder_fatal(errno
, "error binding socket to %s",
945 format_sockaddr(addr
));
946 /* Report what we did */
947 disorder_info("listening on %s", format_sockaddr(addr
));
951 if(getsockopt(rtpfd
, SOL_SOCKET
, SO_RCVBUF
, &rcvbuf
, &len
) < 0)
952 disorder_fatal(errno
, "error calling getsockopt SO_RCVBUF");
953 if(target_rcvbuf
> rcvbuf
) {
954 if(setsockopt(rtpfd
, SOL_SOCKET
, SO_RCVBUF
,
955 &target_rcvbuf
, sizeof target_rcvbuf
) < 0)
956 disorder_error(errno
, "error calling setsockopt SO_RCVBUF %d",
958 /* We try to carry on anyway */
960 disorder_info("changed socket receive buffer from %d to %d",
961 rcvbuf
, target_rcvbuf
);
963 disorder_info("default socket receive buffer %d", rcvbuf
);
964 //info("minbuffer %u maxbuffer %u", minbuffer, maxbuffer);
966 disorder_info("WARNING: -L option can impact performance");
970 if((err
= pthread_create(&tid
, 0, control_thread
, 0)))
971 disorder_fatal(err
, "pthread_create control_thread");
975 unsigned char buffer
[65536];
978 if((fd
= open(dumpfile
, O_RDWR
|O_TRUNC
|O_CREAT
, 0666)) < 0)
979 disorder_fatal(errno
, "opening %s", dumpfile
);
980 /* Fill with 0s to a suitable size */
981 memset(buffer
, 0, sizeof buffer
);
982 for(written
= 0; written
< dump_size
* sizeof(int16_t);
983 written
+= sizeof buffer
) {
984 if(write(fd
, buffer
, sizeof buffer
) < 0)
985 disorder_fatal(errno
, "clearing %s", dumpfile
);
987 /* Map the buffer into memory for convenience */
988 dump_buffer
= mmap(0, dump_size
* sizeof(int16_t), PROT_READ
|PROT_WRITE
,
990 if(dump_buffer
== (void *)-1)
991 disorder_fatal(errno
, "mapping %s", dumpfile
);
992 disorder_info("dumping to %s", dumpfile
);
994 /* Set up output. Currently we only support L16 so there's no harm setting
995 * the format before we know what it is! */
996 uaudio_set_format(44100/*Hz*/, 2/*channels*/,
997 16/*bits/channel*/, 1/*signed*/);
998 uaudio_set("application", "disorder-playrtp");
999 backend
->configure();
1000 backend
->start(playrtp_callback
, NULL
);
1001 if(backend
->open_mixer
) backend
->open_mixer();
1002 /* We receive and convert audio data in a background thread */
1003 if((err
= pthread_create(<id
, 0, listen_thread
, 0)))
1004 disorder_fatal(err
, "pthread_create listen_thread");
1005 /* We have a second thread to add received packets to the queue */
1006 if((err
= pthread_create(<id
, 0, queue_thread
, 0)))
1007 disorder_fatal(err
, "pthread_create queue_thread");
1008 pthread_mutex_lock(&lock
);
1011 /* Wait for the buffer to fill up a bit */
1012 playrtp_fill_buffer();
1013 /* Start playing now */
1014 disorder_info("Playing...");
1015 next_timestamp
= pheap_first(&packets
)->timestamp
;
1017 pthread_mutex_unlock(&lock
);
1018 backend
->activate();
1019 pthread_mutex_lock(&lock
);
1020 /* Wait until the buffer empties out
1022 * If there's a packet that we can play right now then we definitely
1025 * Also if there's at least minbuffer samples we carry on regardless and
1026 * insert silence. The assumption is there's been a pause but more data
1029 while(nsamples
>= minbuffer
1031 && contains(pheap_first(&packets
), next_timestamp
))) {
1033 time_t now
= xtime(0);
1035 if(now
>= lastlog
+ 60) {
1036 int offset
= nsamples
- minbuffer
;
1037 double offtime
= (double)offset
/ (uaudio_rate
* uaudio_channels
);
1038 disorder_info("%+d samples off (%d.%02ds, %d bytes)",
1040 (int)fabs(offtime
) * (offtime
< 0 ?
-1 : 1),
1041 (int)(fabs(offtime
) * 100) % 100,
1042 offset
* uaudio_bits
/ CHAR_BIT
);
1046 //fprintf(stderr, "%8u/%u (%u) PLAYING\n", nsamples, maxbuffer, minbuffer);
1047 pthread_cond_wait(&cond
, &lock
);
1051 struct packet
*p
= pheap_first(&packets
);
1052 fprintf(stderr
, "nsamples=%u (%u) next_timestamp=%"PRIx32
", first packet is [%"PRIx32
",%"PRIx32
")\n",
1053 nsamples
, minbuffer
, next_timestamp
,p
->timestamp
,p
->timestamp
+p
->nsamples
);
1056 /* Stop playing for a bit until the buffer re-fills */
1057 pthread_mutex_unlock(&lock
);
1058 backend
->deactivate();
1059 pthread_mutex_lock(&lock
);
1071 indent-tabs-mode:nil