1
0
mirror of https://github.com/FFmpeg/FFmpeg.git synced 2024-12-23 12:43:46 +02:00
FFmpeg/libavformat/rtpproto.c
Martin Storsjö babd19ce2e rtpproto: Allow specifying the connect option, passed through to udp
By calling connect on the UDP socket, only packets from the chosen
peer address and port are received on the socket. This is one
solution to issue 1688.

Originally committed as revision 26244 to svn://svn.ffmpeg.org/ffmpeg/trunk
2011-01-06 15:16:09 +00:00

371 lines
10 KiB
C

/*
* RTP network protocol
* Copyright (c) 2002 Fabrice Bellard
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
* @file
* RTP protocol
*/
#include "libavutil/avstring.h"
#include "avformat.h"
#include "rtpdec.h"
#include <unistd.h>
#include <stdarg.h>
#include "internal.h"
#include "network.h"
#include "os_support.h"
#include <fcntl.h>
#if HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#include <sys/time.h>
#define RTP_TX_BUF_SIZE (64 * 1024)
#define RTP_RX_BUF_SIZE (128 * 1024)
typedef struct RTPContext {
URLContext *rtp_hd, *rtcp_hd;
int rtp_fd, rtcp_fd;
} RTPContext;
/**
* 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.
*
* @param h media file context
* @param uri of the remote server
* @return zero if no error.
*/
int rtp_set_remote_url(URLContext *h, const char *uri)
{
RTPContext *s = h->priv_data;
char hostname[256];
int port;
char buf[1024];
char path[1024];
av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
path, sizeof(path), uri);
ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port, "%s", path);
udp_set_remote_url(s->rtp_hd, buf);
ff_url_join(buf, sizeof(buf), "udp", NULL, hostname, port + 1, "%s", path);
udp_set_remote_url(s->rtcp_hd, buf);
return 0;
}
/**
* add option to url of the form:
* "http://host:port/path?option1=val1&option2=val2...
*/
static void url_add_option(char *buf, int buf_size, const char *fmt, ...)
{
char buf1[1024];
va_list ap;
va_start(ap, fmt);
if (strchr(buf, '?'))
av_strlcat(buf, "&", buf_size);
else
av_strlcat(buf, "?", buf_size);
vsnprintf(buf1, sizeof(buf1), fmt, ap);
av_strlcat(buf, buf1, buf_size);
va_end(ap);
}
static void build_udp_url(char *buf, int buf_size,
const char *hostname, int port,
int local_port, int ttl,
int max_packet_size, int connect)
{
ff_url_join(buf, buf_size, "udp", NULL, hostname, port, NULL);
if (local_port >= 0)
url_add_option(buf, buf_size, "localport=%d", local_port);
if (ttl >= 0)
url_add_option(buf, buf_size, "ttl=%d", ttl);
if (max_packet_size >=0)
url_add_option(buf, buf_size, "pkt_size=%d", max_packet_size);
if (connect)
url_add_option(buf, buf_size, "connect=1");
}
/**
* url syntax: rtp://host:port[?option=val...]
* option: 'ttl=n' : set the ttl value (for multicast only)
* 'rtcpport=n' : set the remote rtcp port to n
* 'localrtpport=n' : set the local rtp port to n
* 'localrtcpport=n' : set the local rtcp port to n
* 'pkt_size=n' : set max packet size
* 'connect=0/1' : do a connect() on the UDP socket
* deprecated option:
* 'localport=n' : set the local port to n
*
* if rtcpport isn't set the rtcp port will be the rtp port + 1
* if local rtp port isn't set any available port will be used for the local
* rtp and rtcp ports
* if the local rtcp port is not set it will be the local rtp port + 1
*/
static int rtp_open(URLContext *h, const char *uri, int flags)
{
RTPContext *s;
int rtp_port, rtcp_port,
is_output, ttl, connect,
local_rtp_port, local_rtcp_port, max_packet_size;
char hostname[256];
char buf[1024];
char path[1024];
const char *p;
is_output = (flags & URL_WRONLY);
s = av_mallocz(sizeof(RTPContext));
if (!s)
return AVERROR(ENOMEM);
h->priv_data = s;
av_url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &rtp_port,
path, sizeof(path), uri);
/* extract parameters */
ttl = -1;
rtcp_port = rtp_port+1;
local_rtp_port = -1;
local_rtcp_port = -1;
max_packet_size = -1;
connect = 0;
p = strchr(uri, '?');
if (p) {
if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
ttl = strtol(buf, NULL, 10);
}
if (find_info_tag(buf, sizeof(buf), "rtcpport", p)) {
rtcp_port = strtol(buf, NULL, 10);
}
if (find_info_tag(buf, sizeof(buf), "localport", p)) {
local_rtp_port = strtol(buf, NULL, 10);
}
if (find_info_tag(buf, sizeof(buf), "localrtpport", p)) {
local_rtp_port = strtol(buf, NULL, 10);
}
if (find_info_tag(buf, sizeof(buf), "localrtcpport", p)) {
local_rtcp_port = strtol(buf, NULL, 10);
}
if (find_info_tag(buf, sizeof(buf), "pkt_size", p)) {
max_packet_size = strtol(buf, NULL, 10);
}
if (find_info_tag(buf, sizeof(buf), "connect", p)) {
connect = strtol(buf, NULL, 10);
}
}
build_udp_url(buf, sizeof(buf),
hostname, rtp_port, local_rtp_port, ttl, max_packet_size,
connect);
if (url_open(&s->rtp_hd, buf, flags) < 0)
goto fail;
if (local_rtp_port>=0 && local_rtcp_port<0)
local_rtcp_port = udp_get_local_port(s->rtp_hd) + 1;
build_udp_url(buf, sizeof(buf),
hostname, rtcp_port, local_rtcp_port, ttl, max_packet_size,
connect);
if (url_open(&s->rtcp_hd, buf, flags) < 0)
goto fail;
/* just to ease handle access. XXX: need to suppress direct handle
access */
s->rtp_fd = url_get_file_handle(s->rtp_hd);
s->rtcp_fd = url_get_file_handle(s->rtcp_hd);
h->max_packet_size = url_get_max_packet_size(s->rtp_hd);
h->is_streamed = 1;
return 0;
fail:
if (s->rtp_hd)
url_close(s->rtp_hd);
if (s->rtcp_hd)
url_close(s->rtcp_hd);
av_free(s);
return AVERROR(EIO);
}
static int rtp_read(URLContext *h, uint8_t *buf, int size)
{
RTPContext *s = h->priv_data;
struct sockaddr_storage from;
socklen_t from_len;
int len, fd_max, n;
fd_set rfds;
struct timeval tv;
#if 0
for(;;) {
from_len = sizeof(from);
len = recvfrom (s->rtp_fd, buf, size, 0,
(struct sockaddr *)&from, &from_len);
if (len < 0) {
if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
ff_neterrno() == FF_NETERROR(EINTR))
continue;
return AVERROR(EIO);
}
break;
}
#else
for(;;) {
if (url_interrupt_cb())
return AVERROR(EINTR);
/* build fdset to listen to RTP and RTCP packets */
FD_ZERO(&rfds);
fd_max = s->rtp_fd;
FD_SET(s->rtp_fd, &rfds);
if (s->rtcp_fd > fd_max)
fd_max = s->rtcp_fd;
FD_SET(s->rtcp_fd, &rfds);
tv.tv_sec = 0;
tv.tv_usec = 100 * 1000;
n = select(fd_max + 1, &rfds, NULL, NULL, &tv);
if (n > 0) {
/* first try RTCP */
if (FD_ISSET(s->rtcp_fd, &rfds)) {
from_len = sizeof(from);
len = recvfrom (s->rtcp_fd, buf, size, 0,
(struct sockaddr *)&from, &from_len);
if (len < 0) {
if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
ff_neterrno() == FF_NETERROR(EINTR))
continue;
return AVERROR(EIO);
}
break;
}
/* then RTP */
if (FD_ISSET(s->rtp_fd, &rfds)) {
from_len = sizeof(from);
len = recvfrom (s->rtp_fd, buf, size, 0,
(struct sockaddr *)&from, &from_len);
if (len < 0) {
if (ff_neterrno() == FF_NETERROR(EAGAIN) ||
ff_neterrno() == FF_NETERROR(EINTR))
continue;
return AVERROR(EIO);
}
break;
}
} else if (n < 0) {
if (ff_neterrno() == FF_NETERROR(EINTR))
continue;
return AVERROR(EIO);
}
}
#endif
return len;
}
static int rtp_write(URLContext *h, const uint8_t *buf, int size)
{
RTPContext *s = h->priv_data;
int ret;
URLContext *hd;
if (buf[1] >= RTCP_SR && buf[1] <= RTCP_APP) {
/* RTCP payload type */
hd = s->rtcp_hd;
} else {
/* RTP payload type */
hd = s->rtp_hd;
}
ret = url_write(hd, buf, size);
#if 0
{
struct timespec ts;
ts.tv_sec = 0;
ts.tv_nsec = 10 * 1000000;
nanosleep(&ts, NULL);
}
#endif
return ret;
}
static int rtp_close(URLContext *h)
{
RTPContext *s = h->priv_data;
url_close(s->rtp_hd);
url_close(s->rtcp_hd);
av_free(s);
return 0;
}
/**
* Return the local rtp port used by the RTP connection
* @param h media file context
* @return the local port number
*/
int rtp_get_local_rtp_port(URLContext *h)
{
RTPContext *s = h->priv_data;
return udp_get_local_port(s->rtp_hd);
}
/**
* Return the local rtcp port used by the RTP connection
* @param h media file context
* @return the local port number
*/
int rtp_get_local_rtcp_port(URLContext *h)
{
RTPContext *s = h->priv_data;
return udp_get_local_port(s->rtcp_hd);
}
static int rtp_get_file_handle(URLContext *h)
{
RTPContext *s = h->priv_data;
return s->rtp_fd;
}
int rtp_get_rtcp_file_handle(URLContext *h) {
RTPContext *s = h->priv_data;
return s->rtcp_fd;
}
URLProtocol rtp_protocol = {
"rtp",
rtp_open,
rtp_read,
rtp_write,
NULL, /* seek */
rtp_close,
.url_get_file_handle = rtp_get_file_handle,
};