FFmpeg coverage

Line	Branch	Exec	Source
1			/*
2			* UDP prototype streaming system
3			* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
4			*
5			* This file is part of FFmpeg.
6			*
7			* FFmpeg is free software; you can redistribute it and/or
8			* modify it under the terms of the GNU Lesser General Public
9			* License as published by the Free Software Foundation; either
10			* version 2.1 of the License, or (at your option) any later version.
11			*
12			* FFmpeg is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15			* Lesser General Public License for more details.
16			*
17			* You should have received a copy of the GNU Lesser General Public
18			* License along with FFmpeg; if not, write to the Free Software
19			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20			*/
21
22			/**
23			* @file
24			* UDP protocol
25			*/
26
27			#define _DEFAULT_SOURCE
28			#define _BSD_SOURCE /* Needed for using struct ip_mreq with recent glibc */
29
30			#include "avformat.h"
31			#include "libavutil/avassert.h"
32			#include "libavutil/mem.h"
33			#include "libavutil/parseutils.h"
34			#include "libavutil/fifo.h"
35			#include "libavutil/intreadwrite.h"
36			#include "libavutil/opt.h"
37			#include "libavutil/log.h"
38			#include "libavutil/time.h"
39			#include "internal.h"
40			#include "network.h"
41			#include "os_support.h"
42			#include "url.h"
43			#include "ip.h"
44
45			#ifdef __APPLE__
46			#include "TargetConditionals.h"
47			#endif
48
49			#if HAVE_UDPLITE_H
50			#include "udplite.h"
51			#else
52			/* On many Linux systems, udplite.h is missing but the kernel supports UDP-Lite.
53			* So, we provide a fallback here.
54			*/
55			#define UDPLITE_SEND_CSCOV 10
56			#define UDPLITE_RECV_CSCOV 11
57			#endif
58
59			#ifndef IPPROTO_UDPLITE
60			#define IPPROTO_UDPLITE 136
61			#endif
62
63			#if HAVE_W32THREADS
64			#undef HAVE_PTHREAD_CANCEL
65			#define HAVE_PTHREAD_CANCEL 1
66			#endif
67
68			#if HAVE_PTHREAD_CANCEL
69			#include "libavutil/thread.h"
70			#endif
71
72			#ifndef IPV6_ADD_MEMBERSHIP
73			#define IPV6_ADD_MEMBERSHIP IPV6_JOIN_GROUP
74			#define IPV6_DROP_MEMBERSHIP IPV6_LEAVE_GROUP
75			#endif
76
77			#define UDP_TX_BUF_SIZE 32768
78			#define UDP_RX_BUF_SIZE 393216
79			#define UDP_MAX_PKT_SIZE 65536
80			#define UDP_HEADER_SIZE 8
81
82			typedef struct UDPQueuedPacketHeader {
83			int pkt_size;
84			struct sockaddr_storage addr;
85			socklen_t addr_len;
86			} UDPQueuedPacketHeader;
87
88			typedef struct UDPContext {
89			const AVClass *class;
90			int udp_fd;
91			int ttl;
92			int udplite_coverage;
93			int buffer_size;
94			int pkt_size;
95			int is_multicast;
96			int is_broadcast;
97			int local_port;
98			int reuse_socket;
99			int overrun_nonfatal;
100			struct sockaddr_storage dest_addr;
101			int dest_addr_len;
102			int is_connected;
103
104			/* Circular Buffer variables for use in UDP receive code */
105			int circular_buffer_size;
106			AVFifo *rx_fifo;
107			AVFifo *tx_fifo;
108			int circular_buffer_error;
109			int64_t bitrate; /* number of bits to send per second */
110			int64_t burst_bits;
111			int close_req;
112			#if HAVE_PTHREAD_CANCEL
113			pthread_t circular_buffer_thread;
114			pthread_mutex_t mutex;
115			pthread_cond_t cond;
116			int thread_started;
117			#endif
118			uint8_t tmp[UDP_MAX_PKT_SIZE + sizeof(UDPQueuedPacketHeader)];
119			int remaining_in_dg;
120			char *localaddr;
121			int timeout;
122			int dscp;
123			struct sockaddr_storage local_addr_storage;
124			char *sources;
125			char *block;
126			IPSourceFilters filters;
127			struct sockaddr_storage last_recv_addr;
128			socklen_t last_recv_addr_len;
129			} UDPContext;
130
131			#define OFFSET(x) offsetof(UDPContext, x)
132			#define D AV_OPT_FLAG_DECODING_PARAM
133			#define E AV_OPT_FLAG_ENCODING_PARAM
134			static const AVOption options[] = {
135			{ "buffer_size", "System data size (in bytes)", OFFSET(buffer_size), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
136			{ "bitrate", "Bits to send per second", OFFSET(bitrate), AV_OPT_TYPE_INT64, { .i64 = 0 }, 0, INT64_MAX, .flags = E },
137			{ "burst_bits", "Max length of bursts in bits (when using bitrate)", OFFSET(burst_bits), AV_OPT_TYPE_INT64, { .i64 = 0 }, 0, INT64_MAX, .flags = E },
138			{ "localport", "Local port", OFFSET(local_port), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, D|E },
139			{ "local_port", "Local port", OFFSET(local_port), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, INT_MAX, .flags = D|E },
140			{ "localaddr", "Local address", OFFSET(localaddr), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E },
141			{ "udplite_coverage", "choose UDPLite head size which should be validated by checksum", OFFSET(udplite_coverage), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D|E },
142			{ "pkt_size", "Maximum UDP packet size", OFFSET(pkt_size), AV_OPT_TYPE_INT, { .i64 = 1472 }, -1, INT_MAX, .flags = D|E },
143			{ "reuse", "explicitly allow reusing UDP sockets", OFFSET(reuse_socket), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, D|E },
144			{ "reuse_socket", "explicitly allow reusing UDP sockets", OFFSET(reuse_socket), AV_OPT_TYPE_BOOL, { .i64 = -1 }, -1, 1, .flags = D|E },
145			{ "broadcast", "explicitly allow or disallow broadcast destination", OFFSET(is_broadcast), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, E },
146			{ "ttl", "Time to live (multicast only)", OFFSET(ttl), AV_OPT_TYPE_INT, { .i64 = 16 }, 0, 255, E },
147			{ "dscp", "DSCP class for outgoing packets", OFFSET(dscp), AV_OPT_TYPE_INT, { .i64 = -1 }, -1, 63, E },
148			{ "connect", "set if connect() should be called on socket", OFFSET(is_connected), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, .flags = D|E },
149			{ "fifo_size", "set the UDP circular buffer size (in 188-byte packets)", OFFSET(circular_buffer_size), AV_OPT_TYPE_INT, {.i64 = HAVE_PTHREAD_CANCEL ? 7*4096 : 0}, 0, INT_MAX, D },
150			{ "overrun_nonfatal", "survive in case of UDP receiving circular buffer overrun", OFFSET(overrun_nonfatal), AV_OPT_TYPE_BOOL, {.i64 = 0}, 0, 1, D },
151			{ "timeout", "set raise error timeout, in microseconds (only in read mode)",OFFSET(timeout), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D },
152			{ "sources", "Source list", OFFSET(sources), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E },
153			{ "block", "Block list", OFFSET(block), AV_OPT_TYPE_STRING, { .str = NULL }, .flags = D|E },
154			{ NULL }
155			};
156
157			static const AVClass udp_class = {
158			.class_name = "udp",
159			.item_name = av_default_item_name,
160			.option = options,
161			.version = LIBAVUTIL_VERSION_INT,
162			};
163
164			static const AVClass udplite_context_class = {
165			.class_name = "udplite",
166			.item_name = av_default_item_name,
167			.option = options,
168			.version = LIBAVUTIL_VERSION_INT,
169			};
170
171		✗	static int udp_set_multicast_ttl(int sockfd, int mcastTTL,
172			struct sockaddr *addr,
173			void *logctx)
174			{
175			int protocol, cmd;
176
177			/* There is some confusion in the world whether IP_MULTICAST_TTL
178			* takes a byte or an int as an argument.
179			* BSD seems to indicate byte so we are going with that and use
180			* int and fall back to byte to be safe */
181		✗	switch (addr->sa_family) {
182			#ifdef IP_MULTICAST_TTL
183		✗	case AF_INET:
184		✗	protocol = IPPROTO_IP;
185		✗	cmd = IP_MULTICAST_TTL;
186		✗	break;
187			#endif
188			#ifdef IPV6_MULTICAST_HOPS
189		✗	case AF_INET6:
190		✗	protocol = IPPROTO_IPV6;
191		✗	cmd = IPV6_MULTICAST_HOPS;
192		✗	break;
193			#endif
194		✗	default:
195		✗	return 0;
196			}
197
198		✗	if (setsockopt(sockfd, protocol, cmd, &mcastTTL, sizeof(mcastTTL)) < 0) {
199			/* BSD compatibility */
200		✗	unsigned char ttl = (unsigned char) mcastTTL;
201
202		✗	ff_log_net_error(logctx, AV_LOG_DEBUG, "setsockopt(IPV4/IPV6 MULTICAST TTL)");
203		✗	if (setsockopt(sockfd, protocol, cmd, &ttl, sizeof(ttl)) < 0) {
204		✗	ff_log_net_error(logctx, AV_LOG_ERROR, "setsockopt(IPV4/IPV6 MULTICAST TTL)");
205		✗	return ff_neterrno();
206			}
207			}
208
209		✗	return 0;
210			}
211
212		✗	static int udp_join_multicast_group(int sockfd, struct sockaddr *addr,
213			struct sockaddr *local_addr, void *logctx)
214			{
215			#ifdef IP_ADD_MEMBERSHIP
216		✗	if (addr->sa_family == AF_INET) {
217			struct ip_mreq mreq;
218
219		✗	mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
220		✗	if (local_addr)
221		✗	mreq.imr_interface= ((struct sockaddr_in *)local_addr)->sin_addr;
222			else
223		✗	mreq.imr_interface.s_addr = INADDR_ANY;
224		✗	if (setsockopt(sockfd, IPPROTO_IP, IP_ADD_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
225		✗	ff_log_net_error(logctx, AV_LOG_ERROR, "setsockopt(IP_ADD_MEMBERSHIP)");
226		✗	return ff_neterrno();
227			}
228			}
229			#endif
230			#if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
231		✗	if (addr->sa_family == AF_INET6) {
232			struct ipv6_mreq mreq6;
233
234		✗	memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
235			//TODO: Interface index should be looked up from local_addr
236		✗	mreq6.ipv6mr_interface = 0;
237		✗	if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
238		✗	ff_log_net_error(logctx, AV_LOG_ERROR, "setsockopt(IPV6_ADD_MEMBERSHIP)");
239		✗	return ff_neterrno();
240			}
241			}
242			#endif
243		✗	return 0;
244			}
245
246		✗	static int udp_leave_multicast_group(int sockfd, struct sockaddr *addr,
247			struct sockaddr *local_addr, void *logctx)
248			{
249			#ifdef IP_DROP_MEMBERSHIP
250		✗	if (addr->sa_family == AF_INET) {
251			struct ip_mreq mreq;
252
253		✗	mreq.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
254		✗	if (local_addr)
255		✗	mreq.imr_interface = ((struct sockaddr_in *)local_addr)->sin_addr;
256			else
257		✗	mreq.imr_interface.s_addr = INADDR_ANY;
258		✗	if (setsockopt(sockfd, IPPROTO_IP, IP_DROP_MEMBERSHIP, (const void *)&mreq, sizeof(mreq)) < 0) {
259		✗	ff_log_net_error(logctx, AV_LOG_ERROR, "setsockopt(IP_DROP_MEMBERSHIP)");
260		✗	return -1;
261			}
262			}
263			#endif
264			#if HAVE_STRUCT_IPV6_MREQ && defined(IPPROTO_IPV6)
265		✗	if (addr->sa_family == AF_INET6) {
266			struct ipv6_mreq mreq6;
267
268		✗	memcpy(&mreq6.ipv6mr_multiaddr, &(((struct sockaddr_in6 *)addr)->sin6_addr), sizeof(struct in6_addr));
269			//TODO: Interface index should be looked up from local_addr
270		✗	mreq6.ipv6mr_interface = 0;
271		✗	if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_DROP_MEMBERSHIP, &mreq6, sizeof(mreq6)) < 0) {
272		✗	ff_log_net_error(logctx, AV_LOG_ERROR, "setsockopt(IPV6_DROP_MEMBERSHIP)");
273		✗	return -1;
274			}
275			}
276			#endif
277		✗	return 0;
278			}
279
280		✗	static int udp_set_multicast_sources(URLContext *h,
281			int sockfd, struct sockaddr *addr,
282			int addr_len, struct sockaddr_storage *local_addr,
283			struct sockaddr_storage *sources,
284			int nb_sources, int include)
285			{
286		✗	if (addr->sa_family != AF_INET) {
287			#if HAVE_STRUCT_GROUP_SOURCE_REQ && defined(MCAST_BLOCK_SOURCE)
288			/* For IPv4 prefer the old approach, as that alone works reliably on
289			* Windows and it also supports supplying the interface based on its
290			* address. */
291		✗	for (int i = 0; i < nb_sources; i++) {
292			struct group_source_req mreqs;
293		✗	int level = addr->sa_family == AF_INET ? IPPROTO_IP : IPPROTO_IPV6;
294
295			//TODO: Interface index should be looked up from local_addr
296		✗	mreqs.gsr_interface = 0;
297		✗	memcpy(&mreqs.gsr_group, addr, addr_len);
298		✗	memcpy(&mreqs.gsr_source, &sources[i], sizeof(*sources));
299
300		✗	if (setsockopt(sockfd, level,
301			include ? MCAST_JOIN_SOURCE_GROUP : MCAST_BLOCK_SOURCE,
302			(const void *)&mreqs, sizeof(mreqs)) < 0) {
303		✗	if (include)
304		✗	ff_log_net_error(h, AV_LOG_ERROR, "setsockopt(MCAST_JOIN_SOURCE_GROUP)");
305			else
306		✗	ff_log_net_error(h, AV_LOG_ERROR, "setsockopt(MCAST_BLOCK_SOURCE)");
307		✗	return ff_neterrno();
308			}
309			}
310		✗	return 0;
311			#else
312			av_log(h, AV_LOG_ERROR,
313			"Setting multicast sources only supported for IPv4\n");
314			return AVERROR(EINVAL);
315			#endif
316			}
317			#if HAVE_STRUCT_IP_MREQ_SOURCE && defined(IP_BLOCK_SOURCE)
318		✗	for (int i = 0; i < nb_sources; i++) {
319			struct ip_mreq_source mreqs;
320		✗	if (sources[i].ss_family != AF_INET) {
321		✗	av_log(h, AV_LOG_ERROR, "Source/block address %d is of incorrect protocol family\n", i + 1);
322		✗	return AVERROR(EINVAL);
323			}
324
325		✗	mreqs.imr_multiaddr.s_addr = ((struct sockaddr_in *)addr)->sin_addr.s_addr;
326		✗	if (local_addr)
327		✗	mreqs.imr_interface = ((struct sockaddr_in *)local_addr)->sin_addr;
328			else
329		✗	mreqs.imr_interface.s_addr = INADDR_ANY;
330		✗	mreqs.imr_sourceaddr.s_addr = ((struct sockaddr_in *)&sources[i])->sin_addr.s_addr;
331
332		✗	if (setsockopt(sockfd, IPPROTO_IP,
333			include ? IP_ADD_SOURCE_MEMBERSHIP : IP_BLOCK_SOURCE,
334			(const void *)&mreqs, sizeof(mreqs)) < 0) {
335		✗	if (include)
336		✗	ff_log_net_error(h, AV_LOG_ERROR, "setsockopt(IP_ADD_SOURCE_MEMBERSHIP)");
337			else
338		✗	ff_log_net_error(h, AV_LOG_ERROR, "setsockopt(IP_BLOCK_SOURCE)");
339		✗	return ff_neterrno();
340			}
341			}
342			#else
343			return AVERROR(ENOSYS);
344			#endif
345		✗	return 0;
346			}
347		✗	static int udp_set_url(URLContext *h,
348			struct sockaddr_storage *addr,
349			const char *hostname, int port)
350			{
351			struct addrinfo *res0;
352			int addr_len;
353
354		✗	res0 = ff_ip_resolve_host(h, hostname, port, SOCK_DGRAM, AF_UNSPEC, 0);
355		✗	if (!res0) return AVERROR(EIO);
356		✗	memcpy(addr, res0->ai_addr, res0->ai_addrlen);
357		✗	addr_len = res0->ai_addrlen;
358		✗	freeaddrinfo(res0);
359
360		✗	return addr_len;
361			}
362
363		✗	static int udp_socket_create(URLContext *h, struct sockaddr_storage *addr,
364			socklen_t *addr_len, const char *localaddr)
365			{
366		✗	UDPContext *s = h->priv_data;
367		✗	int udp_fd = -1;
368			struct addrinfo *res0, *res;
369		✗	int family = AF_UNSPEC;
370
371		✗	if (((struct sockaddr *) &s->dest_addr)->sa_family)
372		✗	family = ((struct sockaddr *) &s->dest_addr)->sa_family;
373		✗	res0 = ff_ip_resolve_host(h, (localaddr && localaddr[0]) ? localaddr : NULL,
374			s->local_port,
375			SOCK_DGRAM, family, AI_PASSIVE);
376		✗	if (!res0)
377		✗	goto fail;
378		✗	for (res = res0; res; res=res->ai_next) {
379		✗	if (s->udplite_coverage)
380		✗	udp_fd = ff_socket(res->ai_family, SOCK_DGRAM, IPPROTO_UDPLITE, h);
381			else
382		✗	udp_fd = ff_socket(res->ai_family, SOCK_DGRAM, 0, h);
383		✗	if (udp_fd != -1) break;
384		✗	ff_log_net_error(h, AV_LOG_ERROR, "socket");
385			}
386
387		✗	if (udp_fd < 0)
388		✗	goto fail;
389
390		✗	memcpy(addr, res->ai_addr, res->ai_addrlen);
391		✗	*addr_len = res->ai_addrlen;
392
393		✗	freeaddrinfo(res0);
394
395		✗	return udp_fd;
396
397		✗	fail:
398		✗	if (udp_fd >= 0)
399		✗	closesocket(udp_fd);
400		✗	if(res0)
401		✗	freeaddrinfo(res0);
402		✗	return -1;
403			}
404
405		✗	static int udp_port(struct sockaddr_storage *addr, int addr_len)
406			{
407			char sbuf[sizeof(int)*3+1];
408			int error;
409
410		✗	if ((error = getnameinfo((struct sockaddr *)addr, addr_len, NULL, 0, sbuf, sizeof(sbuf), NI_NUMERICSERV)) != 0) {
411		✗	av_log(NULL, AV_LOG_ERROR, "getnameinfo: %s\n", gai_strerror(error));
412		✗	return -1;
413			}
414
415		✗	return strtol(sbuf, NULL, 10);
416			}
417
418
419			/**
420			* If no filename is given to av_open_input_file because you want to
421			* get the local port first, then you must call this function to set
422			* the remote server address.
423			*
424			* url syntax: udp://host:port[?option=val...]
425			* option: 'ttl=n' : set the ttl value (for multicast only)
426			* 'localport=n' : set the local port
427			* 'pkt_size=n' : set max packet size
428			* 'reuse=1' : enable reusing the socket
429			* 'overrun_nonfatal=1': survive in case of circular buffer overrun
430			*
431			* @param h media file context
432			* @param uri of the remote server
433			* @return zero if no error.
434			*/
435		✗	int ff_udp_set_remote_url(URLContext *h, const char *uri)
436			{
437		✗	UDPContext *s = h->priv_data;
438			char hostname[256], buf[10];
439			int port;
440			const char *p;
441
442		✗	av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
443
444			/* set the destination address */
445		✗	s->dest_addr_len = udp_set_url(h, &s->dest_addr, hostname, port);
446		✗	if (s->dest_addr_len < 0) {
447		✗	return AVERROR(EIO);
448			}
449		✗	s->is_multicast = ff_is_multicast_address((struct sockaddr*) &s->dest_addr);
450		✗	p = strchr(uri, '?');
451		✗	if (p) {
452		✗	if (av_find_info_tag(buf, sizeof(buf), "connect", p)) {
453		✗	int was_connected = s->is_connected;
454		✗	s->is_connected = strtol(buf, NULL, 10);
455		✗	if (s->is_connected && !was_connected) {
456		✗	if (connect(s->udp_fd, (struct sockaddr *) &s->dest_addr,
457		✗	s->dest_addr_len)) {
458		✗	s->is_connected = 0;
459		✗	ff_log_net_error(h, AV_LOG_ERROR, "connect");
460		✗	return AVERROR(EIO);
461			}
462			}
463			}
464			}
465
466		✗	return 0;
467			}
468
469			/**
470			* This function is identical to ff_udp_set_remote_url, except that it takes a sockaddr directly.
471			*/
472		✗	int ff_udp_set_remote_addr(URLContext *h, const struct sockaddr *dest_addr, socklen_t dest_addr_len, int do_connect)
473			{
474		✗	UDPContext *s = h->priv_data;
475
476			/* set the destination address */
477		✗	if ((size_t)dest_addr_len > sizeof(s->dest_addr))
478		✗	return AVERROR(EIO);
479		✗	s->dest_addr_len = dest_addr_len;
480		✗	memcpy(&s->dest_addr, dest_addr, dest_addr_len);
481
482		✗	s->is_multicast = ff_is_multicast_address((struct sockaddr*) &s->dest_addr);
483		✗	if (do_connect >= 0) {
484		✗	int was_connected = s->is_connected;
485		✗	s->is_connected = do_connect;
486		✗	if (s->is_connected && !was_connected) {
487		✗	if (connect(s->udp_fd, (struct sockaddr *) &s->dest_addr,
488		✗	s->dest_addr_len)) {
489		✗	s->is_connected = 0;
490		✗	ff_log_net_error(h, AV_LOG_ERROR, "connect");
491		✗	return AVERROR(EIO);
492			}
493			}
494			}
495
496		✗	return 0;
497			}
498
499			/**
500			* Return the local port used by the UDP connection
501			* @param h media file context
502			* @return the local port number
503			*/
504		✗	int ff_udp_get_local_port(URLContext *h)
505			{
506		✗	UDPContext *s = h->priv_data;
507		✗	return s->local_port;
508			}
509
510		✗	void ff_udp_get_last_recv_addr(URLContext *h, struct sockaddr_storage *addr, socklen_t *addr_len)
511			{
512		✗	UDPContext *s = h->priv_data;
513		✗	*addr = s->last_recv_addr;
514		✗	*addr_len = s->last_recv_addr_len;
515		✗	}
516
517			/**
518			* Return the udp file handle for select() usage to wait for several RTP
519			* streams at the same time.
520			* @param h media file context
521			*/
522		✗	static int udp_get_file_handle(URLContext *h)
523			{
524		✗	UDPContext *s = h->priv_data;
525		✗	return s->udp_fd;
526			}
527
528			#if HAVE_PTHREAD_CANCEL
529		✗	static void *circular_buffer_task_rx( void *_URLContext)
530			{
531		✗	URLContext *h = _URLContext;
532		✗	UDPContext *s = h->priv_data;
533			int old_cancelstate;
534
535		✗	ff_thread_setname("udp-rx");
536
537		✗	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate);
538		✗	pthread_mutex_lock(&s->mutex);
539		✗	if (ff_socket_nonblock(s->udp_fd, 0) < 0) {
540		✗	av_log(h, AV_LOG_ERROR, "Failed to set blocking mode");
541		✗	s->circular_buffer_error = AVERROR(EIO);
542		✗	goto end;
543			}
544		✗	while(1) {
545			UDPQueuedPacketHeader pkt_header;
546
547		✗	pthread_mutex_unlock(&s->mutex);
548			/* Blocking operations are always cancellation points;
549			see "General Information" / "Thread Cancellation Overview"
550			in Single Unix. */
551		✗	pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, &old_cancelstate);
552		✗	pkt_header.pkt_size = recvfrom(s->udp_fd, s->tmp + sizeof(pkt_header), sizeof(s->tmp) - sizeof(pkt_header), 0, (struct sockaddr *)&pkt_header.addr, &pkt_header.addr_len);
553		✗	pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &old_cancelstate);
554		✗	pthread_mutex_lock(&s->mutex);
555		✗	if (pkt_header.pkt_size < 0) {
556		✗	if (ff_neterrno() != AVERROR(EAGAIN) && ff_neterrno() != AVERROR(EINTR)) {
557		✗	s->circular_buffer_error = ff_neterrno();
558		✗	goto end;
559			}
560		✗	continue;
561			}
562		✗	if (ff_ip_check_source_lists(&pkt_header.addr, &s->filters))
563		✗	continue;
564		✗	memcpy(s->tmp, &pkt_header, sizeof(pkt_header));
565
566		✗	if (av_fifo_can_write(s->rx_fifo) < pkt_header.pkt_size + sizeof(pkt_header)) {
567			/* No Space left */
568		✗	if (s->overrun_nonfatal) {
569		✗	av_log(h, AV_LOG_WARNING, "Circular buffer overrun. "
570			"Surviving due to overrun_nonfatal option\n");
571		✗	continue;
572			} else {
573		✗	av_log(h, AV_LOG_ERROR, "Circular buffer overrun. "
574			"To avoid, increase fifo_size URL option. "
575			"To survive in such case, use overrun_nonfatal option\n");
576		✗	s->circular_buffer_error = AVERROR(EIO);
577		✗	goto end;
578			}
579			}
580		✗	av_fifo_write(s->rx_fifo, s->tmp, pkt_header.pkt_size + sizeof(pkt_header));
581		✗	pthread_cond_signal(&s->cond);
582			}
583
584		✗	end:
585		✗	pthread_cond_signal(&s->cond);
586		✗	pthread_mutex_unlock(&s->mutex);
587		✗	return NULL;
588			}
589
590		✗	static void *circular_buffer_task_tx( void *_URLContext)
591			{
592		✗	URLContext *h = _URLContext;
593		✗	UDPContext *s = h->priv_data;
594		✗	int64_t target_timestamp = av_gettime_relative();
595		✗	int64_t start_timestamp = av_gettime_relative();
596		✗	int64_t sent_bits = 0;
597		✗	int64_t burst_interval = s->bitrate ? (s->burst_bits * 1000000 / s->bitrate) : 0;
598		✗	int64_t max_delay = s->bitrate ? ((int64_t)h->max_packet_size * 8 * 1000000 / s->bitrate + 1) : 0;
599
600		✗	ff_thread_setname("udp-tx");
601
602		✗	pthread_mutex_lock(&s->mutex);
603
604		✗	if (ff_socket_nonblock(s->udp_fd, 0) < 0) {
605		✗	av_log(h, AV_LOG_ERROR, "Failed to set blocking mode");
606		✗	s->circular_buffer_error = AVERROR(EIO);
607		✗	goto end;
608			}
609
610		✗	for(;;) {
611			int len;
612			const uint8_t *p;
613			uint8_t tmp[4];
614			int64_t timestamp;
615
616		✗	len = av_fifo_can_read(s->tx_fifo);
617
618		✗	while (len<4) {
619		✗	if (s->close_req)
620		✗	goto end;
621		✗	pthread_cond_wait(&s->cond, &s->mutex);
622		✗	len = av_fifo_can_read(s->tx_fifo);
623			}
624
625		✗	av_fifo_read(s->tx_fifo, tmp, 4);
626		✗	len = AV_RL32(tmp);
627
628		✗	av_assert0(len >= 0);
629		✗	av_assert0(len <= sizeof(s->tmp));
630
631		✗	av_fifo_read(s->tx_fifo, s->tmp, len);
632
633		✗	pthread_mutex_unlock(&s->mutex);
634
635		✗	if (s->bitrate) {
636		✗	timestamp = av_gettime_relative();
637		✗	if (timestamp < target_timestamp) {
638		✗	int64_t delay = target_timestamp - timestamp;
639		✗	if (delay > max_delay) {
640		✗	delay = max_delay;
641		✗	start_timestamp = timestamp + delay;
642		✗	sent_bits = 0;
643			}
644		✗	av_usleep(delay);
645			} else {
646		✗	if (timestamp - burst_interval > target_timestamp) {
647		✗	start_timestamp = timestamp - burst_interval;
648		✗	sent_bits = 0;
649			}
650			}
651		✗	sent_bits += len * 8;
652		✗	target_timestamp = start_timestamp + sent_bits * 1000000 / s->bitrate;
653			}
654
655		✗	p = s->tmp;
656		✗	while (len) {
657			int ret;
658		✗	av_assert0(len > 0);
659		✗	if (!s->is_connected) {
660		✗	ret = sendto (s->udp_fd, p, len, 0,
661		✗	(struct sockaddr *) &s->dest_addr,
662		✗	s->dest_addr_len);
663			} else
664		✗	ret = send(s->udp_fd, p, len, 0);
665		✗	if (ret >= 0) {
666		✗	len -= ret;
667		✗	p += ret;
668			} else {
669		✗	ret = ff_neterrno();
670		✗	if (ret != AVERROR(EAGAIN) && ret != AVERROR(EINTR)) {
671		✗	pthread_mutex_lock(&s->mutex);
672		✗	s->circular_buffer_error = ret;
673		✗	pthread_mutex_unlock(&s->mutex);
674		✗	return NULL;
675			}
676			}
677			}
678
679		✗	pthread_mutex_lock(&s->mutex);
680			}
681
682		✗	end:
683		✗	pthread_mutex_unlock(&s->mutex);
684		✗	return NULL;
685			}
686
687
688			#endif
689
690			/* put it in UDP context */
691			/* return non zero if error */
692		✗	static int udp_open(URLContext *h, const char *uri, int flags)
693			{
694			char hostname[1024];
695		✗	int port, udp_fd = -1, tmp, bind_ret = -1;
696		✗	UDPContext *s = h->priv_data;
697			int is_output;
698			const char *p;
699			struct sockaddr_storage my_addr;
700			socklen_t len;
701			int ret;
702
703		✗	h->is_streamed = 1;
704
705		✗	is_output = !(flags & AVIO_FLAG_READ);
706		✗	if (s->buffer_size < 0)
707		✗	s->buffer_size = is_output ? UDP_TX_BUF_SIZE : UDP_RX_BUF_SIZE;
708
709		✗	p = strchr(uri, '?');
710		✗	if (p) {
711		✗	ret = ff_parse_opts_from_query_string(s, p, 1);
712		✗	if (ret < 0)
713		✗	goto fail;
714			}
715			if (!HAVE_PTHREAD_CANCEL) {
716			int64_t optvals[] = {s->overrun_nonfatal, s->bitrate, s->circular_buffer_size};
717			const char* optnames[] = { "overrun_nonfatal", "bitrate", "fifo_size"};
718			for (unsigned i = 0; i < FF_ARRAY_ELEMS(optvals); i++) {
719			if (optvals[i])
720			av_log(h, AV_LOG_WARNING,
721			"'%s' option was set but it is not supported "
722			"on this build (pthread support is required)\n", optnames[i]);
723			}
724			}
725		✗	if (s->sources) {
726		✗	if ((ret = ff_ip_parse_sources(h, s->sources, &s->filters)) < 0)
727		✗	goto fail;
728			}
729		✗	if (s->block) {
730		✗	if ((ret = ff_ip_parse_blocks(h, s->block, &s->filters)) < 0)
731		✗	goto fail;
732			}
733
734			/* handling needed to support options picking from both AVOption and URL */
735		✗	s->circular_buffer_size *= 188;
736		✗	if (flags & AVIO_FLAG_WRITE) {
737		✗	h->max_packet_size = s->pkt_size;
738			} else {
739		✗	h->max_packet_size = UDP_MAX_PKT_SIZE;
740			}
741		✗	h->rw_timeout = s->timeout;
742
743			/* fill the dest addr */
744		✗	av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port, NULL, 0, uri);
745
746			/* XXX: fix av_url_split */
747		✗	if (hostname[0] == '\0' || hostname[0] == '?') {
748			/* only accepts null hostname if input */
749		✗	if (!(flags & AVIO_FLAG_READ)) {
750		✗	ret = AVERROR(EINVAL);
751		✗	goto fail;
752			}
753			} else {
754		✗	if ((ret = ff_udp_set_remote_url(h, uri)) < 0)
755		✗	goto fail;
756			}
757
758		✗	if ((s->is_multicast || s->local_port < 0) && (h->flags & AVIO_FLAG_READ))
759		✗	s->local_port = port;
760
761		✗	udp_fd = udp_socket_create(h, &my_addr, &len, s->localaddr);
762		✗	if (udp_fd < 0) {
763		✗	ret = AVERROR(EIO);
764		✗	goto fail;
765			}
766
767		✗	s->local_addr_storage=my_addr; //store for future multicast join
768
769			/* Follow the requested reuse option, unless it's multicast in which
770			* case enable reuse unless explicitly disabled.
771			*/
772		✗	if (s->reuse_socket > 0 || (s->is_multicast && s->reuse_socket < 0)) {
773		✗	s->reuse_socket = 1;
774		✗	if (setsockopt (udp_fd, SOL_SOCKET, SO_REUSEADDR, &(s->reuse_socket), sizeof(s->reuse_socket)) != 0) {
775		✗	ret = ff_neterrno();
776		✗	goto fail;
777			}
778			}
779
780		✗	if (s->is_broadcast) {
781			#ifdef SO_BROADCAST
782		✗	if (setsockopt (udp_fd, SOL_SOCKET, SO_BROADCAST, &(s->is_broadcast), sizeof(s->is_broadcast)) != 0) {
783		✗	ret = ff_neterrno();
784		✗	goto fail;
785			}
786			#else
787			ret = AVERROR(ENOSYS);
788			goto fail;
789			#endif
790			}
791
792			/* Set the checksum coverage for UDP-Lite (RFC 3828) for sending and receiving.
793			* The receiver coverage has to be less than or equal to the sender coverage.
794			* Otherwise, the receiver will drop all packets.
795			*/
796		✗	if (s->udplite_coverage) {
797		✗	if (setsockopt (udp_fd, IPPROTO_UDPLITE, UDPLITE_SEND_CSCOV, &(s->udplite_coverage), sizeof(s->udplite_coverage)) != 0)
798		✗	av_log(h, AV_LOG_WARNING, "socket option UDPLITE_SEND_CSCOV not available");
799
800		✗	if (setsockopt (udp_fd, IPPROTO_UDPLITE, UDPLITE_RECV_CSCOV, &(s->udplite_coverage), sizeof(s->udplite_coverage)) != 0)
801		✗	av_log(h, AV_LOG_WARNING, "socket option UDPLITE_RECV_CSCOV not available");
802			}
803
804		✗	if (s->dscp >= 0) {
805		✗	int dscp = s->dscp << 2;
806		✗	if (setsockopt (udp_fd, IPPROTO_IP, IP_TOS, &dscp, sizeof(dscp)) != 0) {
807		✗	ret = ff_neterrno();
808		✗	goto fail;
809			}
810			}
811
812			/* If multicast, try binding the multicast address first, to avoid
813			* receiving UDP packets from other sources aimed at the same UDP
814			* port. This fails on windows. This makes sending to the same address
815			* using sendto() fail, so only do it if we're opened in read-only mode. */
816		✗	if (s->is_multicast && (h->flags & AVIO_FLAG_READ)) {
817		✗	bind_ret = bind(udp_fd,(struct sockaddr *)&s->dest_addr, len);
818			}
819			/* bind to the local address if not multicast or if the multicast
820			* bind failed */
821			/* the bind is needed to give a port to the socket now */
822		✗	if (bind_ret < 0 && bind(udp_fd,(struct sockaddr *)&my_addr, len) < 0) {
823		✗	ff_log_net_error(h, AV_LOG_ERROR, "bind failed");
824		✗	ret = ff_neterrno();
825		✗	goto fail;
826			}
827
828		✗	len = sizeof(my_addr);
829		✗	getsockname(udp_fd, (struct sockaddr *)&my_addr, &len);
830		✗	s->local_port = udp_port(&my_addr, len);
831
832		✗	if (s->is_multicast) {
833		✗	if (h->flags & AVIO_FLAG_WRITE) {
834			/* output */
835		✗	if ((ret = udp_set_multicast_ttl(udp_fd, s->ttl, (struct sockaddr *)&s->dest_addr, h)) < 0)
836		✗	goto fail;
837			}
838		✗	if (h->flags & AVIO_FLAG_READ) {
839			/* input */
840		✗	if (s->filters.nb_include_addrs) {
841		✗	if ((ret = udp_set_multicast_sources(h, udp_fd,
842		✗	(struct sockaddr *)&s->dest_addr,
843			s->dest_addr_len, &s->local_addr_storage,
844			s->filters.include_addrs,
845			s->filters.nb_include_addrs, 1)) < 0)
846		✗	goto fail;
847			} else {
848		✗	if ((ret = udp_join_multicast_group(udp_fd, (struct sockaddr *)&s->dest_addr,
849		✗	(struct sockaddr *)&s->local_addr_storage, h)) < 0)
850		✗	goto fail;
851			}
852		✗	if (s->filters.nb_exclude_addrs) {
853		✗	if ((ret = udp_set_multicast_sources(h, udp_fd,
854		✗	(struct sockaddr *)&s->dest_addr,
855			s->dest_addr_len, &s->local_addr_storage,
856			s->filters.exclude_addrs,
857			s->filters.nb_exclude_addrs, 0)) < 0)
858		✗	goto fail;
859			}
860			}
861			}
862
863		✗	if (is_output) {
864			/* limit the tx buf size to limit latency */
865		✗	tmp = s->buffer_size;
866		✗	if (setsockopt(udp_fd, SOL_SOCKET, SO_SNDBUF, &tmp, sizeof(tmp)) < 0) {
867		✗	ff_log_net_error(h, AV_LOG_ERROR, "setsockopt(SO_SNDBUF)");
868		✗	ret = ff_neterrno();
869		✗	goto fail;
870			}
871			} else {
872			/* set udp recv buffer size to the requested value (default UDP_RX_BUF_SIZE) */
873		✗	tmp = s->buffer_size;
874		✗	if (setsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, sizeof(tmp)) < 0) {
875		✗	ff_log_net_error(h, AV_LOG_WARNING, "setsockopt(SO_RECVBUF)");
876			}
877		✗	len = sizeof(tmp);
878		✗	if (getsockopt(udp_fd, SOL_SOCKET, SO_RCVBUF, &tmp, &len) < 0) {
879		✗	ff_log_net_error(h, AV_LOG_WARNING, "getsockopt(SO_RCVBUF)");
880			} else {
881		✗	av_log(h, AV_LOG_DEBUG, "end receive buffer size reported is %d\n", tmp);
882		✗	if(tmp < s->buffer_size)
883		✗	av_log(h, AV_LOG_WARNING, "attempted to set receive buffer to size %d but it only ended up set as %d\n", s->buffer_size, tmp);
884			}
885
886			/* make the socket non-blocking */
887		✗	ff_socket_nonblock(udp_fd, 1);
888			}
889		✗	if (s->is_connected) {
890		✗	if (connect(udp_fd, (struct sockaddr *) &s->dest_addr, s->dest_addr_len)) {
891		✗	ff_log_net_error(h, AV_LOG_ERROR, "connect");
892		✗	ret = ff_neterrno();
893		✗	goto fail;
894			}
895			}
896
897		✗	s->udp_fd = udp_fd;
898
899			#if HAVE_PTHREAD_CANCEL
900			/*
901			Create thread in case of:
902			1. Input and circular_buffer_size is set
903			2. Output and bitrate and circular_buffer_size is set
904			*/
905
906		✗	if (is_output && s->bitrate && !s->circular_buffer_size) {
907			/* Warn user in case of 'circular_buffer_size' is not set */
908		✗	av_log(h, AV_LOG_WARNING,"'bitrate' option was set but 'circular_buffer_size' is not, but required\n");
909			}
910
911		✗	if ((!is_output && s->circular_buffer_size) || (is_output && s->bitrate && s->circular_buffer_size)) {
912			/* start the task going */
913		✗	AVFifo *fifo = av_fifo_alloc2(s->circular_buffer_size, 1, 0);
914		✗	if (!fifo) {
915		✗	ret = AVERROR(ENOMEM);
916		✗	goto fail;
917			}
918		✗	if (is_output)
919		✗	s->tx_fifo = fifo;
920			else
921		✗	s->rx_fifo = fifo;
922		✗	ret = pthread_mutex_init(&s->mutex, NULL);
923		✗	if (ret != 0) {
924		✗	av_log(h, AV_LOG_ERROR, "pthread_mutex_init failed : %s\n", strerror(ret));
925		✗	ret = AVERROR(ret);
926		✗	goto fail;
927			}
928		✗	ret = pthread_cond_init(&s->cond, NULL);
929		✗	if (ret != 0) {
930		✗	av_log(h, AV_LOG_ERROR, "pthread_cond_init failed : %s\n", strerror(ret));
931		✗	ret = AVERROR(ret);
932		✗	goto cond_fail;
933			}
934		✗	ret = pthread_create(&s->circular_buffer_thread, NULL, is_output?circular_buffer_task_tx:circular_buffer_task_rx, h);
935		✗	if (ret != 0) {
936		✗	av_log(h, AV_LOG_ERROR, "pthread_create failed : %s\n", strerror(ret));
937		✗	ret = AVERROR(ret);
938		✗	goto thread_fail;
939			}
940		✗	s->thread_started = 1;
941			}
942			#endif
943
944		✗	return 0;
945			#if HAVE_PTHREAD_CANCEL
946		✗	thread_fail:
947		✗	pthread_cond_destroy(&s->cond);
948		✗	cond_fail:
949		✗	pthread_mutex_destroy(&s->mutex);
950			#endif
951		✗	fail:
952		✗	if (udp_fd >= 0)
953		✗	closesocket(udp_fd);
954		✗	av_fifo_freep2(&s->rx_fifo);
955		✗	av_fifo_freep2(&s->tx_fifo);
956		✗	ff_ip_reset_filters(&s->filters);
957		✗	return ret;
958			}
959
960		✗	static int udplite_open(URLContext *h, const char *uri, int flags)
961			{
962		✗	UDPContext *s = h->priv_data;
963
964			// set default checksum coverage
965		✗	s->udplite_coverage = UDP_HEADER_SIZE;
966
967		✗	return udp_open(h, uri, flags);
968			}
969
970		✗	static int udp_read(URLContext *h, uint8_t *buf, int size)
971			{
972		✗	UDPContext *s = h->priv_data;
973			int ret;
974			#if HAVE_PTHREAD_CANCEL
975		✗	int avail, nonblock = h->flags & AVIO_FLAG_NONBLOCK;
976
977		✗	if (s->rx_fifo) {
978		✗	pthread_mutex_lock(&s->mutex);
979			do {
980		✗	avail = av_fifo_can_read(s->rx_fifo);
981		✗	if (avail) { // >=size) {
982			UDPQueuedPacketHeader header;
983
984		✗	av_fifo_read(s->rx_fifo, &header, sizeof(header));
985
986		✗	s->last_recv_addr = header.addr;
987		✗	s->last_recv_addr_len = header.addr_len;
988
989		✗	avail = header.pkt_size;
990		✗	if(avail > size){
991		✗	av_log(h, AV_LOG_WARNING, "Part of datagram lost due to insufficient buffer size\n");
992		✗	avail = size;
993			}
994
995		✗	av_fifo_read(s->rx_fifo, buf, avail);
996		✗	av_fifo_drain2(s->rx_fifo, header.pkt_size - avail);
997		✗	pthread_mutex_unlock(&s->mutex);
998		✗	return avail;
999		✗	} else if(s->circular_buffer_error){
1000		✗	int err = s->circular_buffer_error;
1001		✗	pthread_mutex_unlock(&s->mutex);
1002		✗	return err;
1003		✗	} else if(nonblock) {
1004		✗	pthread_mutex_unlock(&s->mutex);
1005		✗	return AVERROR(EAGAIN);
1006			} else {
1007			/* FIXME: using the monotonic clock would be better,
1008			but it does not exist on all supported platforms. */
1009		✗	int64_t t = av_gettime() + 100000;
1010		✗	struct timespec tv = { .tv_sec = t / 1000000,
1011		✗	.tv_nsec = (t % 1000000) * 1000 };
1012		✗	int err = pthread_cond_timedwait(&s->cond, &s->mutex, &tv);
1013		✗	if (err) {
1014		✗	pthread_mutex_unlock(&s->mutex);
1015		✗	return AVERROR(err == ETIMEDOUT ? EAGAIN : err);
1016			}
1017		✗	nonblock = 1;
1018			}
1019			} while(1);
1020			}
1021			#endif
1022
1023		✗	if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
1024		✗	ret = ff_network_wait_fd(s->udp_fd, 0);
1025		✗	if (ret < 0)
1026		✗	return ret;
1027			}
1028		✗	s->last_recv_addr_len = sizeof(s->last_recv_addr);
1029		✗	ret = recvfrom(s->udp_fd, buf, size, 0, (struct sockaddr *)&s->last_recv_addr, &s->last_recv_addr_len);
1030		✗	if (ret < 0)
1031		✗	return ff_neterrno();
1032		✗	if (ff_ip_check_source_lists(&s->last_recv_addr, &s->filters))
1033		✗	return AVERROR(EINTR);
1034		✗	return ret;
1035			}
1036
1037		✗	static int udp_write(URLContext *h, const uint8_t *buf, int size)
1038			{
1039		✗	UDPContext *s = h->priv_data;
1040			int ret;
1041
1042			#if HAVE_PTHREAD_CANCEL
1043		✗	if (s->tx_fifo) {
1044			uint8_t tmp[4];
1045
1046		✗	pthread_mutex_lock(&s->mutex);
1047
1048			/*
1049			Return error if last tx failed.
1050			Here we can't know on which packet error was, but it needs to know that error exists.
1051			*/
1052		✗	if (s->circular_buffer_error<0) {
1053		✗	int err = s->circular_buffer_error;
1054		✗	pthread_mutex_unlock(&s->mutex);
1055		✗	return err;
1056			}
1057
1058		✗	if (av_fifo_can_write(s->tx_fifo) < size + 4) {
1059			/* What about a partial packet tx ? */
1060		✗	pthread_mutex_unlock(&s->mutex);
1061		✗	return AVERROR(ENOMEM);
1062			}
1063		✗	AV_WL32(tmp, size);
1064		✗	av_fifo_write(s->tx_fifo, tmp, 4); /* size of packet */
1065		✗	av_fifo_write(s->tx_fifo, buf, size); /* the data */
1066		✗	pthread_cond_signal(&s->cond);
1067		✗	pthread_mutex_unlock(&s->mutex);
1068		✗	return size;
1069			}
1070			#endif
1071		✗	if (!(h->flags & AVIO_FLAG_NONBLOCK)) {
1072		✗	ret = ff_network_wait_fd(s->udp_fd, 1);
1073		✗	if (ret < 0)
1074		✗	return ret;
1075			}
1076
1077		✗	if (!s->is_connected) {
1078		✗	ret = sendto (s->udp_fd, buf, size, 0,
1079		✗	(struct sockaddr *) &s->dest_addr,
1080		✗	s->dest_addr_len);
1081			} else
1082		✗	ret = send(s->udp_fd, buf, size, 0);
1083
1084		✗	return ret < 0 ? ff_neterrno() : ret;
1085			}
1086
1087		✗	static int udp_close(URLContext *h)
1088			{
1089		✗	UDPContext *s = h->priv_data;
1090
1091			#if HAVE_PTHREAD_CANCEL
1092			// Request close once writing is finished
1093		✗	if (s->thread_started && !(h->flags & AVIO_FLAG_READ)) {
1094		✗	pthread_mutex_lock(&s->mutex);
1095		✗	s->close_req = 1;
1096		✗	pthread_cond_signal(&s->cond);
1097		✗	pthread_mutex_unlock(&s->mutex);
1098			}
1099			#endif
1100
1101		✗	if (s->is_multicast && (h->flags & AVIO_FLAG_READ))
1102		✗	udp_leave_multicast_group(s->udp_fd, (struct sockaddr *)&s->dest_addr,
1103		✗	(struct sockaddr *)&s->local_addr_storage, h);
1104			#if HAVE_PTHREAD_CANCEL
1105		✗	if (s->thread_started) {
1106			int ret;
1107			// Cancel only read, as write has been signaled as success to the user
1108		✗	if (h->flags & AVIO_FLAG_READ) {
1109			#ifdef _WIN32
1110			/* recvfrom() is not a cancellation point for win32, so we shutdown
1111			* the socket and abort pending IO, subsequent recvfrom() calls
1112			* will fail with WSAESHUTDOWN causing the thread to exit. */
1113			shutdown(s->udp_fd, SD_RECEIVE);
1114			CancelIoEx((HANDLE)(SOCKET)s->udp_fd, NULL);
1115			#else
1116		✗	pthread_cancel(s->circular_buffer_thread);
1117			#endif
1118			}
1119		✗	ret = pthread_join(s->circular_buffer_thread, NULL);
1120		✗	if (ret != 0)
1121		✗	av_log(h, AV_LOG_ERROR, "pthread_join(): %s\n", strerror(ret));
1122		✗	pthread_mutex_destroy(&s->mutex);
1123		✗	pthread_cond_destroy(&s->cond);
1124			}
1125			#endif
1126		✗	closesocket(s->udp_fd);
1127		✗	av_fifo_freep2(&s->rx_fifo);
1128		✗	av_fifo_freep2(&s->tx_fifo);
1129		✗	ff_ip_reset_filters(&s->filters);
1130		✗	return 0;
1131			}
1132
1133			const URLProtocol ff_udp_protocol = {
1134			.name = "udp",
1135			.url_open = udp_open,
1136			.url_read = udp_read,
1137			.url_write = udp_write,
1138			.url_close = udp_close,
1139			.url_get_file_handle = udp_get_file_handle,
1140			.priv_data_size = sizeof(UDPContext),
1141			.priv_data_class = &udp_class,
1142			.flags = URL_PROTOCOL_FLAG_NETWORK,
1143			};
1144
1145			const URLProtocol ff_udplite_protocol = {
1146			.name = "udplite",
1147			.url_open = udplite_open,
1148			.url_read = udp_read,
1149			.url_write = udp_write,
1150			.url_close = udp_close,
1151			.url_get_file_handle = udp_get_file_handle,
1152			.priv_data_size = sizeof(UDPContext),
1153			.priv_data_class = &udplite_context_class,
1154			.flags = URL_PROTOCOL_FLAG_NETWORK,
1155			};
1156