udp.c

uclinux 下的vlc播放器源代码

/*****************************************************************************
 * udp.c: raw UDP & RTP input module
 *****************************************************************************
 * Copyright (C) 2001-2005 the VideoLAN team
 * $Id: udp.c 19810 2007-04-15 09:52:35Z md $
 *
 * Authors: Christophe Massiot <[e-mail]>
 *          Tristan Leteurtre <[e-mail]>
 *          Laurent Aimar <[e-mail]>
 *          Jean-Paul Saman <jpsaman #_at_# m2x dot nl>
 *
 * Reviewed: 23 October 2003, Jean-Paul Saman <jpsaman _at_ videolan _dot_ org>
 *
 * 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.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <stdlib.h>

#include <vlc/vlc.h>
#include <vlc/input.h>

#include "network.h"

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
#define CACHING_TEXT N_("Caching value in ms")
#define CACHING_LONGTEXT N_( \
    "Caching value for UDP streams. This " \
    "value should be set in milliseconds." )

#define AUTO_MTU_TEXT N_("Autodetection of MTU")
#define AUTO_MTU_LONGTEXT N_( \
    "Automatically detect the line's MTU. This will increase the size if" \
    " truncated packets are found" )

#define RTP_LATE_TEXT N_("RTP reordering timeout in ms")
#define RTP_LATE_LONGTEXT N_( \
    "VLC reorders RTP packets. The input will wait for late packets at most "\
    "the time specified here (in milliseconds)." )

static int  Open ( vlc_object_t * );
static void Close( vlc_object_t * );

vlc_module_begin();
    set_shortname( _("UDP/RTP" ) );
    set_description( _("UDP/RTP input") );
    set_category( CAT_INPUT );
    set_subcategory( SUBCAT_INPUT_ACCESS );

    add_integer( "udp-caching", DEFAULT_PTS_DELAY / 1000, NULL, CACHING_TEXT,
                 CACHING_LONGTEXT, VLC_TRUE );
    add_integer( "rtp-late", 100, NULL, RTP_LATE_TEXT, RTP_LATE_LONGTEXT, VLC_TRUE );

    add_bool( "udp-auto-mtu", 1, NULL,
              AUTO_MTU_TEXT, AUTO_MTU_LONGTEXT, VLC_TRUE );

    set_capability( "access2", 0 );
    add_shortcut( "udp" );
    add_shortcut( "udpstream" );
    add_shortcut( "udp4" );
    add_shortcut( "udp6" );
    add_shortcut( "rtp" );
    add_shortcut( "rtp4" );
    add_shortcut( "rtp6" );
    set_callbacks( Open, Close );
vlc_module_end();

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
#define RTP_HEADER_LEN 12

static block_t *BlockUDP( access_t * );
static block_t *BlockRTP( access_t * );
static block_t *BlockChoose( access_t * );
static int Control( access_t *, int, va_list );

struct access_sys_t
{
    int fd;

    int i_mtu;
    vlc_bool_t b_auto_mtu;

    /* reorder rtp packets when out-of-sequence */
    mtime_t i_rtp_late;
    uint16_t i_last_seqno;
    block_t *p_list;
    block_t *p_end;
};

/*****************************************************************************
 * Open: open the socket
 *****************************************************************************/
static int Open( vlc_object_t *p_this )
{
    access_t     *p_access = (access_t*)p_this;
    access_sys_t *p_sys;

    char *psz_name = strdup( p_access->psz_path );
    char *psz_parser, *psz_server_addr, *psz_bind_addr = "";
    int  i_bind_port, i_server_port = 0;

    /* First set ipv4/ipv6 */
    var_Create( p_access, "ipv4", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );
    var_Create( p_access, "ipv6", VLC_VAR_BOOL | VLC_VAR_DOINHERIT );

    if( *p_access->psz_access )
    {
        vlc_value_t val;
        /* Find out which shortcut was used */
        if( !strncmp( p_access->psz_access, "udp4", 6 ) ||
            !strncmp( p_access->psz_access, "rtp4", 6 ))
        {
            val.b_bool = VLC_TRUE;
            var_Set( p_access, "ipv4", val );

            val.b_bool = VLC_FALSE;
            var_Set( p_access, "ipv6", val );
        }
        else if( !strncmp( p_access->psz_access, "udp6", 6 ) ||
                 !strncmp( p_access->psz_access, "rtp6", 6 ) )
        {
            val.b_bool = VLC_TRUE;
            var_Set( p_access, "ipv6", val );

            val.b_bool = VLC_FALSE;
            var_Set( p_access, "ipv4", val );
        }
    }

    i_bind_port = var_CreateGetInteger( p_access, "server-port" );

    /* Parse psz_name syntax :
     * [serveraddr[:serverport]][@[bindaddr]:[bindport]] */
    psz_parser = strchr( psz_name, '@' );
    if( psz_parser != NULL )
    {
        /* Found bind address and/or bind port */
        *psz_parser++ = '\0';
        psz_bind_addr = psz_parser;

        if( *psz_parser == '[' )
            /* skips bracket'd IPv6 address */
            psz_parser = strchr( psz_parser, ']' );

        if( psz_parser != NULL )
        {
            psz_parser = strchr( psz_parser, ':' );
            if( psz_parser != NULL )
            {
                *psz_parser++ = '\0';
                i_bind_port = atoi( psz_parser );
            }
        }
    }

    psz_server_addr = psz_name;
    if( *psz_server_addr == '[' )
        /* skips bracket'd IPv6 address */
        psz_parser = strchr( psz_name, ']' );

    if( psz_parser != NULL )
    {
        psz_parser = strchr( psz_parser, ':' );
        if( psz_parser != NULL )
        {
            *psz_parser++ = '\0';
            i_server_port = atoi( psz_parser );
        }
    }

    msg_Dbg( p_access, "opening server=%s:%d local=%s:%d",
             psz_server_addr, i_server_port, psz_bind_addr, i_bind_port );

    /* Set up p_access */
    p_access->pf_read = NULL;
    p_access->pf_block = BlockChoose;
    p_access->pf_control = Control;
    p_access->pf_seek = NULL;
    p_access->info.i_update = 0;
    p_access->info.i_size = 0;
    p_access->info.i_pos = 0;
    p_access->info.b_eof = VLC_FALSE;
    p_access->info.b_prebuffered = VLC_FALSE;
    p_access->info.i_title = 0;
    p_access->info.i_seekpoint = 0;

    p_access->p_sys = p_sys = malloc( sizeof( access_sys_t ) );
    memset (p_sys, 0, sizeof (*p_sys));
    p_sys->fd = net_OpenUDP( p_access, psz_bind_addr, i_bind_port,
                                      psz_server_addr, i_server_port );
    if( p_sys->fd < 0 )
    {
        msg_Err( p_access, "cannot open socket" );
        free( psz_name );
        free( p_sys );
        return VLC_EGENERIC;
    }
    free( psz_name );

    net_StopSend( p_sys->fd );

    /* FIXME */
    p_sys->i_mtu = var_CreateGetInteger( p_access, "mtu" );
    if( p_sys->i_mtu <= 1 )
        p_sys->i_mtu  = 1500;   /* Avoid problem */

    p_sys->b_auto_mtu = var_CreateGetBool( p_access, "udp-auto-mtu" );;

    /* Update default_pts to a suitable value for udp access */
    var_Create( p_access, "udp-caching", VLC_VAR_INTEGER | VLC_VAR_DOINHERIT );


    /* RTP reordering for out-of-sequence packets */
    p_sys->i_rtp_late = var_CreateGetInteger( p_access, "rtp-late" ) * 1000;
    p_sys->i_last_seqno = 0;
    p_sys->p_list = NULL;
    p_sys->p_end = NULL;
    return VLC_SUCCESS;
}

/*****************************************************************************
 * Close: free unused data structures
 *****************************************************************************/
static void Close( vlc_object_t *p_this )
{
    access_t     *p_access = (access_t*)p_this;
    access_sys_t *p_sys = p_access->p_sys;

    block_ChainRelease( p_sys->p_list );
    net_Close( p_sys->fd );
    free( p_sys );
}

/*****************************************************************************
 * Control:
 *****************************************************************************/
static int Control( access_t *p_access, int i_query, va_list args )
{
    access_sys_t *p_sys = p_access->p_sys;
    vlc_bool_t   *pb_bool;
    int          *pi_int;
    int64_t      *pi_64;

    switch( i_query )
    {
        /* */
        case ACCESS_CAN_SEEK:
        case ACCESS_CAN_FASTSEEK:
        case ACCESS_CAN_PAUSE:
        case ACCESS_CAN_CONTROL_PACE:
            pb_bool = (vlc_bool_t*)va_arg( args, vlc_bool_t* );
            *pb_bool = VLC_FALSE;
            break;
        /* */
        case ACCESS_GET_MTU:
            pi_int = (int*)va_arg( args, int * );
            *pi_int = p_sys->i_mtu;
            break;

        case ACCESS_GET_PTS_DELAY:
            pi_64 = (int64_t*)va_arg( args, int64_t * );
            *pi_64 = var_GetInteger( p_access, "udp-caching" ) * 1000;
            break;

        /* */
        case ACCESS_SET_PAUSE_STATE:
        case ACCESS_GET_TITLE_INFO:
        case ACCESS_SET_TITLE:
        case ACCESS_SET_SEEKPOINT:
        case ACCESS_SET_PRIVATE_ID_STATE:
            return VLC_EGENERIC;

        default:
            msg_Warn( p_access, "unimplemented query in control" );
            return VLC_EGENERIC;

    }
    return VLC_SUCCESS;
}

/*****************************************************************************
 * BlockUDP:
 *****************************************************************************/
static block_t *BlockUDP( access_t *p_access )
{
    access_sys_t *p_sys = p_access->p_sys;