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331 lines
10 KiB
331 lines
10 KiB
/*****************************************************************************
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* rtp.c: RTP access plug-in
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*****************************************************************************
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* Copyright (C) 2001, 2002 VideoLAN
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* $Id: rtp.c,v 1.2 2002/09/30 11:05:34 sam Exp $
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*
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* Authors: Christophe Massiot <massiot@via.ecp.fr>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#include <stdlib.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <string.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <vlc/vlc.h>
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#include <vlc/input.h>
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#ifdef HAVE_UNISTD_H
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# include <unistd.h>
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#elif defined( _MSC_VER ) && defined( _WIN32 )
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# include <io.h>
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#endif
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#include "network.h"
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#define RTP_HEADER_LEN 12
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/*****************************************************************************
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* Local prototypes
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*****************************************************************************/
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static int Open ( vlc_object_t * );
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static int RTPNetworkRead( input_thread_t *, byte_t *, size_t );
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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vlc_module_begin();
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set_description( _("RTP access module") );
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set_capability( "access", 0 );
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add_shortcut( "rtp" );
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add_shortcut( "rtpstream" );
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add_shortcut( "rtp4" );
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add_shortcut( "rtp6" );
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set_callbacks( Open, __input_FDNetworkClose );
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vlc_module_end();
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/*****************************************************************************
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* Open: open the socket
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*****************************************************************************/
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static int Open( vlc_object_t *p_this )
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{
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input_thread_t * p_input = (input_thread_t *)p_this;
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input_socket_t * p_access_data;
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module_t * p_network;
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char * psz_network = "";
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char * psz_name = strdup(p_input->psz_name);
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char * psz_parser = psz_name;
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char * psz_server_addr = "";
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char * psz_server_port = "";
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char * psz_bind_addr = "";
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char * psz_bind_port = "";
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int i_bind_port = 0, i_server_port = 0;
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network_socket_t socket_desc;
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if( config_GetInt( p_input, "ipv4" ) )
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{
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psz_network = "ipv4";
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}
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if( config_GetInt( p_input, "ipv6" ) )
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{
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psz_network = "ipv6";
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}
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if( *p_input->psz_access )
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{
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/* Find out which shortcut was used */
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if( !strncmp( p_input->psz_access, "rtp6", 5 ) )
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{
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psz_network = "ipv6";
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}
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else if( !strncmp( p_input->psz_access, "rtp4", 5 ) )
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{
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psz_network = "ipv4";
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}
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}
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/* Parse psz_name syntax :
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* [serveraddr[:serverport]][@[bindaddr]:[bindport]] */
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if( *psz_parser && *psz_parser != '@' )
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{
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/* Found server */
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psz_server_addr = psz_parser;
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while( *psz_parser && *psz_parser != ':' && *psz_parser != '@' )
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{
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if( *psz_parser == '[' )
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{
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/* IPv6 address */
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while( *psz_parser && *psz_parser != ']' )
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{
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psz_parser++;
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}
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}
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psz_parser++;
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}
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if( *psz_parser == ':' )
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{
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/* Found server port */
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*psz_parser = '\0'; /* Terminate server name */
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psz_parser++;
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psz_server_port = psz_parser;
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while( *psz_parser && *psz_parser != '@' )
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{
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psz_parser++;
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}
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}
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}
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if( *psz_parser == '@' )
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{
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/* Found bind address or bind port */
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*psz_parser = '\0'; /* Terminate server port or name if necessary */
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psz_parser++;
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if( *psz_parser && *psz_parser != ':' )
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{
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/* Found bind address */
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psz_bind_addr = psz_parser;
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while( *psz_parser && *psz_parser != ':' )
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{
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if( *psz_parser == '[' )
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{
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/* IPv6 address */
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while( *psz_parser && *psz_parser != ']' )
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{
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psz_parser++;
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}
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}
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psz_parser++;
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}
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}
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if( *psz_parser == ':' )
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{
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/* Found bind port */
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*psz_parser = '\0'; /* Terminate bind address if necessary */
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psz_parser++;
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psz_bind_port = psz_parser;
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}
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}
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/* Convert ports format */
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if( *psz_server_port )
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{
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i_server_port = strtol( psz_server_port, &psz_parser, 10 );
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if( *psz_parser )
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{
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msg_Err( p_input, "cannot parse server port near %s", psz_parser );
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free(psz_name);
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return( -1 );
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}
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}
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if( *psz_bind_port )
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{
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i_bind_port = strtol( psz_bind_port, &psz_parser, 10 );
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if( *psz_parser )
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{
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msg_Err( p_input, "cannot parse bind port near %s", psz_parser );
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free(psz_name);
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return( -1 );
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}
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}
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p_input->pf_read = RTPNetworkRead;
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p_input->pf_set_program = input_SetProgram;
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p_input->pf_set_area = NULL;
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p_input->pf_seek = NULL;
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vlc_mutex_lock( &p_input->stream.stream_lock );
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p_input->stream.b_pace_control = 0;
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p_input->stream.b_seekable = 0;
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p_input->stream.p_selected_area->i_tell = 0;
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p_input->stream.i_method = INPUT_METHOD_NETWORK;
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vlc_mutex_unlock( &p_input->stream.stream_lock );
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if( *psz_server_addr || i_server_port )
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{
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msg_Err( p_input, "this RTP syntax is deprecated; the server argument will be");
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msg_Err( p_input, "ignored (%s:%d). If you wanted to enter a multicast address",
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psz_server_addr, i_server_port);
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msg_Err( p_input, "or local port, type : %s:@%s:%d",
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*p_input->psz_access ? p_input->psz_access : "udp",
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psz_server_addr, i_server_port );
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i_server_port = 0;
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psz_server_addr = "";
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}
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msg_Dbg( p_input, "opening server=%s:%d local=%s:%d",
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psz_server_addr, i_server_port, psz_bind_addr, i_bind_port );
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/* Prepare the network_socket_t structure */
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socket_desc.i_type = NETWORK_UDP;
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socket_desc.psz_bind_addr = psz_bind_addr;
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socket_desc.i_bind_port = i_bind_port;
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socket_desc.psz_server_addr = psz_server_addr;
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socket_desc.i_server_port = i_server_port;
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/* Find an appropriate network module */
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p_input->p_private = (void*) &socket_desc;
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p_network = module_Need( p_input, "network", psz_network );
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free(psz_name);
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if( p_network == NULL )
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{
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return( -1 );
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}
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module_Unneed( p_input, p_network );
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p_access_data = malloc( sizeof(input_socket_t) );
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p_input->p_access_data = (access_sys_t *)p_access_data;
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if( p_access_data == NULL )
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{
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msg_Err( p_input, "out of memory" );
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return( -1 );
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}
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p_access_data->i_handle = socket_desc.i_handle;
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p_input->i_mtu = socket_desc.i_mtu;
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p_input->psz_demux = "ts";
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return( 0 );
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}
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/*****************************************************************************
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* RTPNetworkRead : Read for the network, and parses the RTP header
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*****************************************************************************/
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static int RTPNetworkRead( input_thread_t * p_input, byte_t * p_buffer,
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size_t i_len )
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{
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int i_rtp_version;
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int i_CSRC_count;
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int i_payload_type;
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int i;
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byte_t p_tmp_buffer[1500];
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// Get the Raw data from the socket
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// We first assume that RTP header size is the classic RTP_HEADER_LEN
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ssize_t i_ret = input_FDNetworkRead(p_input, p_tmp_buffer,
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i_len + RTP_HEADER_LEN);
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if (!i_ret) return 0;
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// Parse the header and make some verifications
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// See RFC 1889 & RFC 2250
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i_rtp_version = ( p_tmp_buffer[0] & 0xC0 ) >> 6;
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i_CSRC_count = ( p_tmp_buffer[0] & 0x0F );
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i_payload_type = ( p_tmp_buffer[1] & 0x7F );
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if ( i_rtp_version != 2 )
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msg_Dbg( p_input, "RTP version is %u, should be 2", i_rtp_version );
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if ( i_payload_type != 33 )
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msg_Dbg( p_input, "RTP payload type is %u, only 33 (Mpeg2-TS) \
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is supported", i_payload_type );
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// If both bytes are wrong, maybe a synchro error occurred...
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if (( i_rtp_version != 2 ) && ( i_payload_type != 0x33 ))
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{
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msg_Dbg( p_input, "Too many RTP errors, trying to re-synchronize" );
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//Trying to re-synchronize
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for ( i=0 ; (i<i_len) ||
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((( p_tmp_buffer[0] & 0xC0 ) >> 6 == 2 )
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&& ( p_tmp_buffer[1] & 0x7F ) >> 6 == 0x33 ) ; i++);
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if (i!=i_len)
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{
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input_FDNetworkRead(p_input, p_tmp_buffer,i);
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return 0;
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}
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}
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/*
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// if i_CSRC_count != 0, the header is in fact longer than RTP_HEADER_LEN
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// so we have to read some extra bytes
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// This case is supposed to be very rare (vls does not handle that),
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// so in practical this second input_FDNetworkRead is never done...
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if (i_CSRC_count)
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{ i_ret += input_FDNetworkRead(p_input,
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p_tmp_buffer + i_len + RTP_HEADER_LEN,
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4 * i_CSRC_count );
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}
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*/
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// Return the packet without the RTP header
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i_ret -= ( RTP_HEADER_LEN + 4 * i_CSRC_count );
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p_input->p_vlc->pf_memcpy( p_buffer,
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p_tmp_buffer + RTP_HEADER_LEN + 4 * i_CSRC_count,
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i_ret );
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return (i_ret);
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}
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