mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-07 11:13:41 +02:00
5509bffa88
Originally committed as revision 4842 to svn://svn.ffmpeg.org/ffmpeg/trunk
301 lines
8.0 KiB
C
301 lines
8.0 KiB
C
/*
|
|
* RTP network protocol
|
|
* Copyright (c) 2002 Fabrice Bellard.
|
|
*
|
|
* This library 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 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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 this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#include "avformat.h"
|
|
|
|
#include <unistd.h>
|
|
#include <stdarg.h>
|
|
#include <sys/types.h>
|
|
#include <sys/socket.h>
|
|
#include <netinet/in.h>
|
|
#ifndef __BEOS__
|
|
# include <arpa/inet.h>
|
|
#else
|
|
# include "barpainet.h"
|
|
#endif
|
|
#include <netdb.h>
|
|
#include <fcntl.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 s1 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];
|
|
|
|
url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
|
|
path, sizeof(path), uri);
|
|
|
|
snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port, path);
|
|
udp_set_remote_url(s->rtp_hd, buf);
|
|
|
|
snprintf(buf, sizeof(buf), "udp://%s:%d%s", hostname, port + 1, 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, '?'))
|
|
pstrcat(buf, buf_size, "&");
|
|
else
|
|
pstrcat(buf, buf_size, "?");
|
|
vsnprintf(buf1, sizeof(buf1), fmt, ap);
|
|
pstrcat(buf, buf_size, buf1);
|
|
va_end(ap);
|
|
}
|
|
|
|
static void build_udp_url(char *buf, int buf_size,
|
|
const char *hostname, int port,
|
|
int local_port, int multicast, int ttl)
|
|
{
|
|
snprintf(buf, buf_size, "udp://%s:%d", hostname, port);
|
|
if (local_port >= 0)
|
|
url_add_option(buf, buf_size, "localport=%d", local_port);
|
|
if (multicast)
|
|
url_add_option(buf, buf_size, "multicast=1", multicast);
|
|
if (ttl >= 0)
|
|
url_add_option(buf, buf_size, "ttl=%d", ttl);
|
|
}
|
|
|
|
/*
|
|
* url syntax: rtp://host:port[?option=val...]
|
|
* option: 'multicast=1' : enable multicast
|
|
* 'ttl=n' : set the ttl value (for multicast only)
|
|
* 'localport=n' : set the local port to n
|
|
*
|
|
*/
|
|
static int rtp_open(URLContext *h, const char *uri, int flags)
|
|
{
|
|
RTPContext *s;
|
|
int port, is_output, is_multicast, ttl, local_port;
|
|
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 -ENOMEM;
|
|
h->priv_data = s;
|
|
|
|
url_split(NULL, 0, NULL, 0, hostname, sizeof(hostname), &port,
|
|
path, sizeof(path), uri);
|
|
/* extract parameters */
|
|
is_multicast = 0;
|
|
ttl = -1;
|
|
local_port = -1;
|
|
p = strchr(uri, '?');
|
|
if (p) {
|
|
is_multicast = find_info_tag(buf, sizeof(buf), "multicast", p);
|
|
if (find_info_tag(buf, sizeof(buf), "ttl", p)) {
|
|
ttl = strtol(buf, NULL, 10);
|
|
}
|
|
if (find_info_tag(buf, sizeof(buf), "localport", p)) {
|
|
local_port = strtol(buf, NULL, 10);
|
|
}
|
|
}
|
|
|
|
build_udp_url(buf, sizeof(buf),
|
|
hostname, port, local_port, is_multicast, ttl);
|
|
if (url_open(&s->rtp_hd, buf, flags) < 0)
|
|
goto fail;
|
|
local_port = udp_get_local_port(s->rtp_hd);
|
|
/* XXX: need to open another connexion if the port is not even */
|
|
|
|
/* well, should suppress localport in path */
|
|
|
|
build_udp_url(buf, sizeof(buf),
|
|
hostname, port + 1, local_port + 1, is_multicast, ttl);
|
|
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 = udp_get_file_handle(s->rtp_hd);
|
|
s->rtcp_fd = udp_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_IO;
|
|
}
|
|
|
|
static int rtp_read(URLContext *h, uint8_t *buf, int size)
|
|
{
|
|
RTPContext *s = h->priv_data;
|
|
struct sockaddr_in from;
|
|
int from_len, len, fd_max, n;
|
|
fd_set rfds;
|
|
#if 0
|
|
for(;;) {
|
|
from_len = sizeof(from);
|
|
len = recvfrom (s->rtp_fd, buf, size, 0,
|
|
(struct sockaddr *)&from, &from_len);
|
|
if (len < 0) {
|
|
if (errno == EAGAIN || errno == EINTR)
|
|
continue;
|
|
return AVERROR_IO;
|
|
}
|
|
break;
|
|
}
|
|
#else
|
|
for(;;) {
|
|
/* 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);
|
|
n = select(fd_max + 1, &rfds, NULL, NULL, NULL);
|
|
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 (errno == EAGAIN || errno == EINTR)
|
|
continue;
|
|
return AVERROR_IO;
|
|
}
|
|
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 (errno == EAGAIN || errno == EINTR)
|
|
continue;
|
|
return AVERROR_IO;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
return len;
|
|
}
|
|
|
|
static int rtp_write(URLContext *h, uint8_t *buf, int size)
|
|
{
|
|
RTPContext *s = h->priv_data;
|
|
int ret;
|
|
URLContext *hd;
|
|
|
|
if (buf[1] >= 200 && buf[1] <= 204) {
|
|
/* 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 port used by the RTP connexion
|
|
* @param s1 media file context
|
|
* @return the local port number
|
|
*/
|
|
int rtp_get_local_port(URLContext *h)
|
|
{
|
|
RTPContext *s = h->priv_data;
|
|
return udp_get_local_port(s->rtp_hd);
|
|
}
|
|
|
|
/**
|
|
* Return the rtp and rtcp file handles for select() usage to wait for several RTP
|
|
* streams at the same time.
|
|
* @param h media file context
|
|
*/
|
|
void rtp_get_file_handles(URLContext *h, int *prtp_fd, int *prtcp_fd)
|
|
{
|
|
RTPContext *s = h->priv_data;
|
|
|
|
*prtp_fd = s->rtp_fd;
|
|
*prtcp_fd = s->rtcp_fd;
|
|
}
|
|
|
|
URLProtocol rtp_protocol = {
|
|
"rtp",
|
|
rtp_open,
|
|
rtp_read,
|
|
rtp_write,
|
|
NULL, /* seek */
|
|
rtp_close,
|
|
};
|