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mpv/stream/librtsp/rtsp_rtp.c

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/*
* Copyright (C) 2006 Benjamin Zores
* based on the Freebox patch for xine by Vincent Mussard
* but with many enhancements for better RTSP RFC compliance.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <sys/types.h>
#include <inttypes.h>
#include "config.h"
#ifndef HAVE_WINSOCK2
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#else
#include <winsock2.h>
#include <ws2tcpip.h>
#endif
#include "mp_msg.h"
#include "rtsp.h"
#include "rtsp_rtp.h"
#include "rtsp_session.h"
#include "../freesdp/common.h"
#include "../freesdp/parser.h"
#define RTSP_DEFAULT_PORT 31336
#define MAX_LENGTH 256
#define RTSP_ACCEPT_SDP "Accept: application/sdp"
#define RTSP_CONTENT_LENGTH "Content-length"
#define RTSP_CONTENT_TYPE "Content-Type"
#define RTSP_APPLICATION_SDP "application/sdp"
#define RTSP_RANGE "Range: "
#define RTSP_NPT_NOW "npt=now-"
#define RTSP_MEDIA_CONTAINER_MPEG_TS "33"
#define RTSP_TRANSPORT_REQUEST "Transport: RTP/AVP;%s;%s%i-%i;mode=\"PLAY\""
#define RTSP_TRANSPORT_MULTICAST "multicast"
#define RTSP_TRANSPORT_UNICAST "unicast"
#define RTSP_MULTICAST_PORT "port="
#define RTSP_UNICAST_CLIENT_PORT "client_port="
#define RTSP_UNICAST_SERVER_PORT "server_port="
#define RTSP_SETUP_DESTINATION "destination="
#define RTSP_SESSION "Session"
#define RTSP_TRANSPORT "Transport"
/* hardcoded RTCP RR - this is _NOT_ RFC compliant */
#define RTCP_RR_SIZE 32
#define RTCP_RR "\201\311\0\7(.JD\31+\306\343\0\0\0\0\0\0/E\0\0\2&\0\0\0\0\0\0\0\0\201"
#define RTCP_SEND_FREQUENCY 1024
int rtsp_port = 0;
char *rtsp_destination = NULL;
void
rtcp_send_rr (rtsp_t *s, struct rtp_rtsp_session_t *st)
{
if (st->rtcp_socket == -1)
return;
/* send RTCP RR every RTCP_SEND_FREQUENCY packets
* FIXME : NOT CORRECT, HARDCODED, BUT MAKES SOME SERVERS HAPPY
* not rfc compliant
* http://www.faqs.org/rfcs/rfc1889.html chapter 6 for RTCP
*/
if (st->count == RTCP_SEND_FREQUENCY)
{
char rtcp_content[RTCP_RR_SIZE];
strcpy (rtcp_content, RTCP_RR);
send (st->rtcp_socket, rtcp_content, RTCP_RR_SIZE, 0);
/* ping RTSP server to keep connection alive.
we use OPTIONS instead of PING as not all servers support it */
rtsp_request_options (s, "*");
st->count = 0;
}
else
st->count++;
}
static struct rtp_rtsp_session_t *
rtp_session_new (void)
{
struct rtp_rtsp_session_t *st = NULL;
st = malloc (sizeof (struct rtp_rtsp_session_t));
st->rtp_socket = -1;
st->rtcp_socket = -1;
st->control_url = NULL;
st->count = 0;
return st;
}
void
rtp_session_free (struct rtp_rtsp_session_t *st)
{
if (!st)
return;
if (st->rtp_socket != -1)
close (st->rtp_socket);
if (st->rtcp_socket != -1)
close (st->rtcp_socket);
if (st->control_url)
free (st->control_url);
free (st);
}
static void
rtp_session_set_fd (struct rtp_rtsp_session_t *st,
int rtp_sock, int rtcp_sock)
{
if (!st)
return;
st->rtp_socket = rtp_sock;
st->rtcp_socket = rtcp_sock;
}
static int
parse_port (const char *line, const char *param,
int *rtp_port, int *rtcp_port)
{
char *parse1;
char *parse2;
char *parse3;
char *line_copy = strdup (line);
parse1 = strstr (line_copy, param);
if (parse1)
{
parse2 = strstr (parse1, "-");
if (parse2)
{
parse3 = strstr (parse2, ";");
if (parse3)
parse3[0] = 0;
parse2[0] = 0;
}
else
{
free (line_copy);
return 0;
}
}
else
{
free (line_copy);
return 0;
}
*rtp_port = atoi (parse1 + strlen (param));
*rtcp_port = atoi (parse2 + 1);
free (line_copy);
return 1;
}
static char *
parse_destination (const char *line)
{
char *parse1;
char *parse2;
char *dest = NULL;
char *line_copy = strdup (line);
int len;
parse1 = strstr (line_copy, RTSP_SETUP_DESTINATION);
if (!parse1)
{
free (line_copy);
return NULL;
}
parse2 = strstr (parse1, ";");
if (!parse2)
{
free (line_copy);
return NULL;
}
len = strlen (parse1) - strlen (parse2)
- strlen (RTSP_SETUP_DESTINATION) + 1;
dest = (char *) malloc (len + 1);
snprintf (dest, len, parse1 + strlen (RTSP_SETUP_DESTINATION));
free (line_copy);
return dest;
}
static int
rtcp_connect (int client_port, int server_port, const char* server_hostname)
{
struct sockaddr_in sin;
struct hostent *hp;
int s;
if (client_port <= 1023)
return -1;
s = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (s == -1)
return -1;
hp = gethostbyname (server_hostname);
if (!hp)
{
close (s);
return -1;
}
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = INADDR_ANY;
sin.sin_port = htons (client_port);
if (bind (s, (struct sockaddr *) &sin, sizeof (sin)))
{
#ifndef HAVE_WINSOCK2
if (errno != EINPROGRESS)
#else
if (WSAGetLastError() != WSAEINPROGRESS)
#endif
{
close (s);
return -1;
}
}
sin.sin_family = AF_INET;
memcpy (&(sin.sin_addr.s_addr), hp->h_addr, sizeof (hp->h_addr));
sin.sin_port = htons (server_port);
/* datagram socket */
if (connect (s, (struct sockaddr *) &sin, sizeof (sin)) < 0)
{
close (s);
return -1;
}
return s;
}
static int
rtp_connect (char *hostname, int port)
{
struct sockaddr_in sin;
struct timeval tv;
int err, err_len;
int rxsockbufsz;
int s;
fd_set set;
if (port <= 1023)
return -1;
s = socket (PF_INET, SOCK_DGRAM, 0);
if (s == -1)
return -1;
sin.sin_family = AF_INET;
if (!hostname || !strcmp (hostname, "0.0.0.0"))
sin.sin_addr.s_addr = htonl (INADDR_ANY);
else
#ifndef HAVE_WINSOCK2
#ifdef USE_ATON
inet_aton (hostname, &sin.sin_addr);
#else
inet_pton (AF_INET, hostname, &sin.sin_addr);
#endif
#else
sin.sin_addr.s_addr = htonl (INADDR_ANY);
#endif
sin.sin_port = htons (port);
/* Increase the socket rx buffer size to maximum -- this is UDP */
rxsockbufsz = 240 * 1024;
if (setsockopt (s, SOL_SOCKET, SO_RCVBUF,
&rxsockbufsz, sizeof (rxsockbufsz)))
mp_msg (MSGT_OPEN, MSGL_ERR, "Couldn't set receive socket buffer size\n");
/* if multicast address, add membership */
if ((ntohl (sin.sin_addr.s_addr) >> 28) == 0xe)
{
struct ip_mreq mcast;
mcast.imr_multiaddr.s_addr = sin.sin_addr.s_addr;
mcast.imr_interface.s_addr = 0;
if (setsockopt (s, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mcast, sizeof (mcast)))
{
mp_msg (MSGT_OPEN, MSGL_ERR, "IP_ADD_MEMBERSHIP failed\n");
close (s);
return -1;
}
}
/* datagram socket */
if (bind (s, (struct sockaddr *) &sin, sizeof (sin)))
{
#ifndef HAVE_WINSOCK2
if (errno != EINPROGRESS)
#else
if (WSAGetLastError() != WSAEINPROGRESS)
#endif
{
mp_msg (MSGT_OPEN, MSGL_ERR, "bind: %s\n", strerror (errno));
close (s);
return -1;
}
}
tv.tv_sec = 1; /* 1 second timeout */
tv.tv_usec = 0;
FD_ZERO (&set);
FD_SET (s, &set);
err = select (s + 1, &set, NULL, NULL, &tv);
if (err < 0)
{
mp_msg (MSGT_OPEN, MSGL_ERR, "Select failed: %s\n", strerror (errno));
close (s);
return -1;
}
else if (err == 0)
{
mp_msg (MSGT_OPEN, MSGL_ERR, "Timeout! No data from host %s\n", hostname);
close (s);
return -1;
}
err_len = sizeof (err);
getsockopt (s, SOL_SOCKET, SO_ERROR, &err, (socklen_t *) &err_len);
if (err)
{
mp_msg (MSGT_OPEN, MSGL_ERR, "Socket error: %d\n", err);
close (s);
return -1;
}
return s;
}
static int
is_multicast_address (char *addr)
{
struct sockaddr_in sin;
if (!addr)
return -1;
sin.sin_family = AF_INET;
#ifndef HAVE_WINSOCK2
#ifdef USE_ATON
inet_aton (addr, &sin.sin_addr);
#else
inet_pton (AF_INET, addr, &sin.sin_addr);
#endif
#else
sin.sin_addr.s_addr = htonl (INADDR_ANY);
#endif
if ((ntohl (sin.sin_addr.s_addr) >> 28) == 0xe)
return 1;
return 0;
}
struct rtp_rtsp_session_t *
rtp_setup_and_play (rtsp_t *rtsp_session)
{
struct rtp_rtsp_session_t* rtp_session = NULL;
const fsdp_media_description_t *med_dsc = NULL;
char temp_buf[MAX_LENGTH + 1];
char npt[256];
char* answer;
char* sdp;
char *server_addr = NULL;
char *destination = NULL;
int statut;
int content_length = 0;
int is_multicast = 0;
fsdp_description_t *dsc = NULL;
fsdp_error_t result;
int client_rtp_port = -1;
int client_rtcp_port = -1;
int server_rtp_port = -1;
int server_rtcp_port = -1;
int rtp_sock = -1;
int rtcp_sock = -1;
/* 1. send a RTSP DESCRIBE request to server */
rtsp_schedule_field (rtsp_session, RTSP_ACCEPT_SDP);
statut = rtsp_request_describe (rtsp_session, NULL);
if (statut < 200 || statut > 299)
return NULL;
answer = rtsp_search_answers (rtsp_session, RTSP_CONTENT_LENGTH);
if (answer)
content_length = atoi (answer);
else
return NULL;
answer = rtsp_search_answers (rtsp_session, RTSP_CONTENT_TYPE);
if (!answer || !strstr (answer, RTSP_APPLICATION_SDP))
return NULL;
/* 2. read SDP message from server */
sdp = (char *) malloc (content_length + 1);
if (rtsp_read_data (rtsp_session, sdp, content_length) <= 0)
{
free (sdp);
return NULL;
}
sdp[content_length] = 0;
/* 3. parse SDP message */
dsc = fsdp_description_new ();
result = fsdp_parse (sdp, dsc);
if (result != FSDPE_OK)
{
free (sdp);
fsdp_description_delete (dsc);
return NULL;
}
mp_msg (MSGT_OPEN, MSGL_V, "SDP:\n%s\n", sdp);
free (sdp);
/* 4. check for number of media streams: only one is supported */
if (fsdp_get_media_count (dsc) != 1)
{
mp_msg (MSGT_OPEN, MSGL_ERR,
"A single media stream only is supported atm.\n");
fsdp_description_delete (dsc);
return NULL;
}
/* 5. set the Normal Play Time parameter
* use range provided by server in SDP or start now if empty */
sprintf (npt, RTSP_RANGE);
if (fsdp_get_range (dsc))
strcat (npt, fsdp_get_range (dsc));
else
strcat (npt, RTSP_NPT_NOW);
/* 5. check for a valid media stream */
med_dsc = fsdp_get_media (dsc, 0);
if (!med_dsc)
{
fsdp_description_delete (dsc);
return NULL;
}
/* 6. parse the `m=<media> <port> <transport> <fmt list>' line */
/* check for an A/V media */
if (fsdp_get_media_type (med_dsc) != FSDP_MEDIA_VIDEO &&
fsdp_get_media_type (med_dsc) != FSDP_MEDIA_AUDIO)
{
fsdp_description_delete (dsc);
return NULL;
}
/* only RTP/AVP transport method is supported right now */
if (fsdp_get_media_transport_protocol (med_dsc) != FSDP_TP_RTP_AVP)
{
fsdp_description_delete (dsc);
return NULL;
}
/* only MPEG-TS is supported at the moment */
if (!strstr (fsdp_get_media_format (med_dsc, 0),
RTSP_MEDIA_CONTAINER_MPEG_TS))
{
fsdp_description_delete (dsc);
return NULL;
}
/* get client port (if any) advised by server */
client_rtp_port = fsdp_get_media_port (med_dsc);
if (client_rtp_port == -1)
{
fsdp_description_delete (dsc);
return NULL;
}
/* if client_rtp_port = 0 => let client randomly pick one */
if (client_rtp_port == 0)
{
/* TODO: we should check if the port is in use first */
if (rtsp_port)
client_rtp_port = rtsp_port;
else
client_rtp_port = RTSP_DEFAULT_PORT;
}
/* RTCP port generally is RTP port + 1 */
client_rtcp_port = client_rtp_port + 1;
mp_msg (MSGT_OPEN, MSGL_V,
"RTP Port from SDP appears to be: %d\n", client_rtp_port);
mp_msg (MSGT_OPEN, MSGL_V,
"RTCP Port from SDP appears to be: %d\n", client_rtcp_port);
/* 7. parse the `c=<network type> <addr type> <connection address>' line */
/* check for a valid media network type (inet) */
if (fsdp_get_media_network_type (med_dsc) != FSDP_NETWORK_TYPE_INET)
{
/* no control for media: try global one instead */
if (fsdp_get_global_conn_network_type (dsc) != FSDP_NETWORK_TYPE_INET)
{
fsdp_description_delete (dsc);
return NULL;
}
}
/* only IPv4 is supported atm. */
if (fsdp_get_media_address_type (med_dsc) != FSDP_ADDRESS_TYPE_IPV4)
{
/* no control for media: try global one instead */
if (fsdp_get_global_conn_address_type (dsc) != FSDP_ADDRESS_TYPE_IPV4)
{
fsdp_description_delete (dsc);
return NULL;
}
}
/* get the media server address to connect to */
if (fsdp_get_media_address (med_dsc))
server_addr = strdup (fsdp_get_media_address (med_dsc));
else if (fsdp_get_global_conn_address (dsc))
{
/* no control for media: try global one instead */
server_addr = strdup (fsdp_get_global_conn_address (dsc));
}
if (!server_addr)
{
fsdp_description_delete (dsc);
return NULL;
}
/* check for a UNICAST or MULTICAST address to connect to */
is_multicast = is_multicast_address (server_addr);
/* 8. initiate an RTP session */
rtp_session = rtp_session_new ();
if (!rtp_session)
{
free (server_addr);
fsdp_description_delete (dsc);
return NULL;
}
/* get the media control URL */
if (fsdp_get_media_control (med_dsc, 0))
rtp_session->control_url = strdup (fsdp_get_media_control (med_dsc, 0));
fsdp_description_delete (dsc);
if (!rtp_session->control_url)
{
free (server_addr);
rtp_session_free (rtp_session);
return NULL;
}
/* 9. create the payload for RTSP SETUP request */
memset (temp_buf, '\0', MAX_LENGTH);
snprintf (temp_buf, MAX_LENGTH,
RTSP_TRANSPORT_REQUEST,
is_multicast ? RTSP_TRANSPORT_MULTICAST : RTSP_TRANSPORT_UNICAST,
is_multicast ? RTSP_MULTICAST_PORT : RTSP_UNICAST_CLIENT_PORT,
client_rtp_port, client_rtcp_port);
mp_msg (MSGT_OPEN, MSGL_V, "RTSP Transport: %s\n", temp_buf);
rtsp_unschedule_field (rtsp_session, RTSP_SESSION);
rtsp_schedule_field (rtsp_session, temp_buf);
/* 10. check for the media control URL type and initiate RTSP SETUP */
if (!strncmp (rtp_session->control_url, "rtsp://", 7)) /* absolute URL */
statut = rtsp_request_setup (rtsp_session,
rtp_session->control_url, NULL);
else /* relative URL */
statut = rtsp_request_setup (rtsp_session,
NULL, rtp_session->control_url);
if (statut < 200 || statut > 299)
{
free (server_addr);
rtp_session_free (rtp_session);
return NULL;
}
/* 11. parse RTSP SETUP response: we need it to actually determine
* the real address and port to connect to */
answer = rtsp_search_answers (rtsp_session, RTSP_TRANSPORT);
if (!answer)
{
free (server_addr);
rtp_session_free (rtp_session);
return NULL;
}
/* check for RTP and RTCP ports to bind according to how request was done */
is_multicast = 0;
if (strstr (answer, RTSP_TRANSPORT_MULTICAST))
is_multicast = 1;
if (is_multicast)
parse_port (answer, RTSP_MULTICAST_PORT,
&client_rtp_port, &client_rtcp_port);
else
{
parse_port (answer, RTSP_UNICAST_CLIENT_PORT,
&client_rtp_port, &client_rtcp_port);
parse_port (answer, RTSP_UNICAST_SERVER_PORT,
&server_rtp_port, &server_rtcp_port);
}
/* now check network settings as determined by server */
if (rtsp_destination)
destination = strdup (rtsp_destination);
else
destination = parse_destination (answer);
if (!destination)
destination = strdup (server_addr);
free (server_addr);
mp_msg (MSGT_OPEN, MSGL_V, "RTSP Destination: %s\n", destination);
mp_msg (MSGT_OPEN, MSGL_V, "Client RTP port : %d\n", client_rtp_port);
mp_msg (MSGT_OPEN, MSGL_V, "Client RTCP port : %d\n", client_rtcp_port);
mp_msg (MSGT_OPEN, MSGL_V, "Server RTP port : %d\n", server_rtp_port);
mp_msg (MSGT_OPEN, MSGL_V, "Server RTCP port : %d\n", server_rtcp_port);
/* 12. performs RTSP PLAY request */
rtsp_schedule_field (rtsp_session, npt);
statut = rtsp_request_play (rtsp_session, NULL);
if (statut < 200 || statut > 299)
{
free (destination);
rtp_session_free (rtp_session);
return NULL;
}
/* 13. create RTP and RTCP connections */
rtp_sock = rtp_connect (destination, client_rtp_port);
rtcp_sock = rtcp_connect (client_rtcp_port, server_rtcp_port, destination);
rtp_session_set_fd (rtp_session, rtp_sock, rtcp_sock);
free (destination);
mp_msg (MSGT_OPEN, MSGL_V, "RTP Sock : %d\nRTCP Sock : %d\n",
rtp_session->rtp_socket, rtp_session->rtcp_socket);
if (rtp_session->rtp_socket == -1)
{
rtp_session_free (rtp_session);
return NULL;
}
return rtp_session;
}
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