udp.c File Reference

UDP protocol. More...

#include "avformat.h"
#include "avio_internal.h"
#include "libavutil/parseutils.h"
#include "libavutil/fifo.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "libavutil/log.h"
#include "libavutil/time.h"
#include "internal.h"
#include "network.h"
#include "os_support.h"
#include "url.h"

Go to the source code of this file.

Data Structures
struct	UDPContext

Macros
#define	_BSD_SOURCE   /* Needed for using struct ip_mreq with recent glibc */
#define	HAVE_PTHREAD_CANCEL   0
#define	IPV6_ADD_MEMBERSHIP   IPV6_JOIN_GROUP
#define	IPV6_DROP_MEMBERSHIP   IPV6_LEAVE_GROUP
#define	UDP_TX_BUF_SIZE   32768
#define	UDP_MAX_PKT_SIZE   65536
#define	OFFSET(x)   offsetof(UDPContext, x)
#define	D   AV_OPT_FLAG_DECODING_PARAM
#define	E   AV_OPT_FLAG_ENCODING_PARAM

Functions
static void	log_net_error (void *ctx, int level, const char *prefix)
static int	udp_set_multicast_ttl (int sockfd, int mcastTTL, struct sockaddr *addr)
static int	udp_join_multicast_group (int sockfd, struct sockaddr *addr, struct sockaddr *local_addr)
static int	udp_leave_multicast_group (int sockfd, struct sockaddr *addr, struct sockaddr *local_addr)
static struct addrinfo *	udp_resolve_host (const char *hostname, int port, int type, int family, int flags)
static int	udp_set_multicast_sources (int sockfd, struct sockaddr *addr, int addr_len, char **sources, int nb_sources, int include)
static int	udp_set_url (struct sockaddr_storage *addr, const char *hostname, int port)
static int	udp_socket_create (UDPContext *s, struct sockaddr_storage *addr, socklen_t *addr_len, const char *localaddr)
static int	udp_port (struct sockaddr_storage *addr, int addr_len)
int	ff_udp_set_remote_url (URLContext *h, const char *uri)
	If no filename is given to av_open_input_file because you want to get the local port first, then you must call this function to set the remote server address.
int	ff_udp_get_local_port (URLContext *h)
	Return the local port used by the UDP connection.
static int	udp_get_file_handle (URLContext *h)
	Return the udp file handle for select() usage to wait for several RTP streams at the same time.
static int	parse_source_list (char *buf, char **sources, int *num_sources, int max_sources)
static int	udp_open (URLContext *h, const char *uri, int flags)
static int	udp_read (URLContext *h, uint8_t *buf, int size)
static int	udp_write (URLContext *h, const uint8_t *buf, int size)
static int	udp_close (URLContext *h)

Variables
static const AVOption	options []
static const AVClass	udp_context_class
URLProtocol	ff_udp_protocol

Detailed Description

UDP protocol.

Definition in file udp.c.

Macro Definition Documentation

#define _BSD_SOURCE   /* Needed for using struct ip_mreq with recent glibc */

Definition at line 27 of file udp.c.

#define HAVE_PTHREAD_CANCEL   0

Definition at line 48 of file udp.c.

Referenced by udp_open().

#define IPV6_ADD_MEMBERSHIP   IPV6_JOIN_GROUP

Definition at line 52 of file udp.c.

Referenced by udp_join_multicast_group().

#define IPV6_DROP_MEMBERSHIP   IPV6_LEAVE_GROUP

Definition at line 53 of file udp.c.

Referenced by udp_leave_multicast_group().

#define UDP_TX_BUF_SIZE   32768

Definition at line 56 of file udp.c.

Referenced by udp_open().

#define UDP_MAX_PKT_SIZE   65536

Definition at line 57 of file udp.c.

Referenced by udp_open().

#define OFFSET

(

x

)

offsetof(UDPContext, x)

Definition at line 91 of file udp.c.

#define D   AV_OPT_FLAG_DECODING_PARAM

Definition at line 92 of file udp.c.

#define E   AV_OPT_FLAG_ENCODING_PARAM

Definition at line 93 of file udp.c.

Function Documentation

static void log_net_error ( void *  ctx, int  level, const char *  prefix  )

static

Definition at line 117 of file udp.c.

Referenced by ff_udp_set_remote_url(), udp_join_multicast_group(), udp_leave_multicast_group(), udp_open(), udp_set_multicast_sources(), udp_set_multicast_ttl(), and udp_socket_create().

static int udp_set_multicast_ttl ( int  sockfd, int  mcastTTL, struct sockaddr *  addr  )

static

Definition at line 124 of file udp.c.

Referenced by udp_open().

static int udp_join_multicast_group ( int  sockfd, struct sockaddr *  addr, struct sockaddr *  local_addr  )

static

Definition at line 146 of file udp.c.

Referenced by udp_open().

static int udp_leave_multicast_group ( int  sockfd, struct sockaddr *  addr, struct sockaddr *  local_addr  )

static

Definition at line 178 of file udp.c.

Referenced by udp_close().

static struct addrinfo* udp_resolve_host ( const char *  hostname, int  port, int  type, int  family, int  flags  )

staticread

Definition at line 210 of file udp.c.

Referenced by udp_set_multicast_sources(), udp_set_url(), and udp_socket_create().

static int udp_set_multicast_sources ( int  sockfd, struct sockaddr *  addr, int  addr_len, char **  sources, int  nb_sources, int  include  )

static

Definition at line 236 of file udp.c.

Referenced by udp_open().

static int udp_set_url ( struct sockaddr_storage *  addr, const char *  hostname, int  port  )

static

Definition at line 309 of file udp.c.

Referenced by ff_udp_set_remote_url().

static int udp_socket_create ( UDPContext *  s, struct sockaddr_storage *  addr, socklen_t *  addr_len, const char *  localaddr  )

static

Definition at line 324 of file udp.c.

Referenced by udp_open().

static int udp_port ( struct sockaddr_storage *  addr, int  addr_len  )

static

Definition at line 361 of file udp.c.

Referenced by udp_open().

int ff_udp_set_remote_url	(	URLContext *	h,
		const char *	uri
	)

If no filename is given to av_open_input_file because you want to get the local port first, then you must call this function to set the remote server address.

url syntax: udp://host:port[?option=val...] option: 'ttl=n' : set the ttl value (for multicast only) 'localport=n' : set the local port 'pkt_size=n' : set max packet size 'reuse=1' : enable reusing the socket 'overrun_nonfatal=1': survive in case of circular buffer overrun

Parameters

h	media file context
uri	of the remote server

Returns

zero if no error.

Definition at line 391 of file udp.c.

Referenced by ff_rtp_set_remote_url(), and udp_open().

int ff_udp_get_local_port

(

URLContext *

h

)

Return the local port used by the UDP connection.

Parameters

h	media file context

Returns

the local port number

Definition at line 430 of file udp.c.

Referenced by ff_rtp_get_local_rtcp_port(), ff_rtp_get_local_rtp_port(), and rtp_open().

static int udp_get_file_handle ( URLContext *  h )

static

Return the udp file handle for select() usage to wait for several RTP streams at the same time.

Parameters

h	media file context

Definition at line 441 of file udp.c.

static int parse_source_list ( char *  buf, char **  sources, int *  num_sources, int  max_sources  )

static

Definition at line 506 of file udp.c.

Referenced by udp_open().

static int udp_open ( URLContext *  h, const char *  uri, int  flags  )

static

Definition at line 529 of file udp.c.

static int udp_read ( URLContext *  h, uint8_t *  buf, int  size  )

static

Definition at line 783 of file udp.c.

static int udp_write ( URLContext *  h, const uint8_t *  buf, int  size  )

static

Definition at line 842 of file udp.c.

static int udp_close ( URLContext *  h )

static

Definition at line 863 of file udp.c.

Variable Documentation

const AVOption options[]

static

Initial value:

= {
{"buffer_size", "set packet buffer size in bytes", OFFSET(buffer_size), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D|E },
{"localport", "set local port to bind to", OFFSET(local_port), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D|E },
{"localaddr", "choose local IP address", OFFSET(local_addr), AV_OPT_TYPE_STRING, {.str = ""}, 0, 0, D|E },
{"pkt_size", "set size of UDP packets", OFFSET(packet_size), AV_OPT_TYPE_INT, {.i64 = 1472}, 0, INT_MAX, D|E },
{"reuse", "explicitly allow or disallow reusing UDP sockets", OFFSET(reuse_socket), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D|E },
{"broadcast", "explicitly allow or disallow broadcast destination", OFFSET(is_broadcast), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, E },
{"ttl", "set the time to live value (for multicast only)", OFFSET(ttl), AV_OPT_TYPE_INT, {.i64 = 16}, 0, INT_MAX, E },
{"connect", "set if connect() should be called on socket", OFFSET(is_connected), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D|E },

{"fifo_size", "set the UDP receiving circular buffer size, expressed as a number of packets with size of 188 bytes", OFFSET(circular_buffer_size), AV_OPT_TYPE_INT, {.i64 = 7*4096}, 0, INT_MAX, D },
{"overrun_nonfatal", "survive in case of UDP receiving circular buffer overrun", OFFSET(overrun_nonfatal), AV_OPT_TYPE_INT, {.i64 = 0}, 0, 1, D },
{"timeout", "set raise error timeout (only in read mode)", OFFSET(timeout), AV_OPT_TYPE_INT, {.i64 = 0}, 0, INT_MAX, D },
{NULL}
}

Definition at line 94 of file udp.c.

const AVClass udp_context_class

static

Initial value:

= {
    .class_name     = "udp",
    .item_name      = av_default_item_name,
    .option         = options,
    .version        = LIBAVUTIL_VERSION_INT,
}

Definition at line 110 of file udp.c.

URLProtocol ff_udp_protocol

Initial value:

= {
    .name                = "udp",
    .url_open            = udp_open,
    .url_read            = udp_read,
    .url_write           = udp_write,
    .url_close           = udp_close,
    .url_get_file_handle = udp_get_file_handle,
    .priv_data_size      = sizeof(UDPContext),
    .priv_data_class     = &udp_context_class,
    .flags               = URL_PROTOCOL_FLAG_NETWORK,
}

Definition at line 885 of file udp.c.