udp.c

VLC Player Source Code

/*****************************************************************************
 * udp.c
 *****************************************************************************
 * Copyright (C) 2001-2007 the VideoLAN team
 * $Id: 2cadddf90bbf178a0362174671d64083553164cd $
 *
 * Authors: Laurent Aimar <[e-mail]>
 *          Eric Petit <[e-mail]>
 *
 * 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
 *****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <vlc_common.h>
#include <vlc_plugin.h>

#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>
#include <assert.h>

#include <vlc_sout.h>
#include <vlc_block.h>

#ifdef HAVE_UNISTD_H
#   include <unistd.h>
#endif

#ifdef WIN32
#   include <winsock2.h>
#   include <ws2tcpip.h>
#else
#   include <sys/socket.h>
#endif

#include <vlc_network.h>

#define MAX_EMPTY_BLOCKS 200

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
static int  Open ( vlc_object_t * );
static void Close( vlc_object_t * );

#define SOUT_CFG_PREFIX "sout-udp-"

#define CACHING_TEXT N_("Caching value (ms)")
#define CACHING_LONGTEXT N_( \
    "Default caching value for outbound UDP streams. This " \
    "value should be set in milliseconds." )

#define GROUP_TEXT N_("Group packets")
#define GROUP_LONGTEXT N_("Packets can be sent one by one at the right time " \
                          "or by groups. You can choose the number " \
                          "of packets that will be sent at a time. It " \
                          "helps reducing the scheduling load on " \
                          "heavily-loaded systems." )

vlc_module_begin();
    set_description( N_("UDP stream output") );
    set_shortname( "UDP" );
    set_category( CAT_SOUT );
    set_subcategory( SUBCAT_SOUT_ACO );
    add_integer( SOUT_CFG_PREFIX "caching", DEFAULT_PTS_DELAY / 1000, NULL, CACHING_TEXT, CACHING_LONGTEXT, true );
    add_integer( SOUT_CFG_PREFIX "group", 1, NULL, GROUP_TEXT, GROUP_LONGTEXT,
                                 true );
    add_obsolete_integer( SOUT_CFG_PREFIX "late" );
    add_obsolete_bool( SOUT_CFG_PREFIX "raw" );

    set_capability( "sout access", 100 );
    add_shortcut( "udp" );
    set_callbacks( Open, Close );
vlc_module_end();

/*****************************************************************************
 * Exported prototypes
 *****************************************************************************/

static const char *const ppsz_sout_options[] = {
    "caching",
    "group",
    NULL
};

/* Options handled by the libvlc network core */
static const char *const ppsz_core_options[] = {
    "dscp",
    "ttl",
    "miface",
    "miface-addr",
    NULL
};

static ssize_t Write   ( sout_access_out_t *, block_t * );
static int  Seek    ( sout_access_out_t *, off_t  );

static void* ThreadWrite( vlc_object_t * );
static block_t *NewUDPPacket( sout_access_out_t *, mtime_t );

typedef struct sout_access_thread_t
{
    VLC_COMMON_MEMBERS

    sout_instance_t *p_sout;

    block_fifo_t *p_fifo;

    int         i_handle;

    int64_t     i_caching;
    int         i_group;

    block_fifo_t *p_empty_blocks;
} sout_access_thread_t;

struct sout_access_out_sys_t
{
    int                 i_mtu;
    bool          b_mtu_warning;

    block_t             *p_buffer;

    sout_access_thread_t *p_thread;

};

#define DEFAULT_PORT 1234

/*****************************************************************************
 * Open: open the file
 *****************************************************************************/
static int Open( vlc_object_t *p_this )
{
    sout_access_out_t       *p_access = (sout_access_out_t*)p_this;
    sout_access_out_sys_t   *p_sys;

    char                *psz_dst_addr = NULL;
    int                 i_dst_port;

    int                 i_handle;

    config_ChainParse( p_access, SOUT_CFG_PREFIX,
                       ppsz_sout_options, p_access->p_cfg );
    config_ChainParse( p_access, "",
                       ppsz_core_options, p_access->p_cfg );

    if (var_Create (p_access, "dst-port", VLC_VAR_INTEGER)
     || var_Create (p_access, "src-port", VLC_VAR_INTEGER)
     || var_Create (p_access, "dst-addr", VLC_VAR_STRING)
     || var_Create (p_access, "src-addr", VLC_VAR_STRING))
    {
        return VLC_ENOMEM;
    }

    if( !( p_sys = calloc ( 1, sizeof( sout_access_out_sys_t ) ) ) )
        return VLC_ENOMEM;
    p_access->p_sys = p_sys;

    i_dst_port = DEFAULT_PORT;
    char *psz_parser = psz_dst_addr = strdup( p_access->psz_path );
    if( !psz_dst_addr )
    {
        free( p_sys );
        return VLC_ENOMEM;
    }

    if (psz_parser[0] == '[')
        psz_parser = strchr (psz_parser, ']');

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

    p_sys->p_thread =
        vlc_object_create( p_access, sizeof( sout_access_thread_t ) );
    if( !p_sys->p_thread )
    {
        free (p_sys);
        free (psz_dst_addr);
        return VLC_ENOMEM;
    }

    vlc_object_attach( p_sys->p_thread, p_access );
    p_sys->p_thread->p_sout = p_access->p_sout;
    p_sys->p_thread->b_die  = 0;
    p_sys->p_thread->b_error= 0;
    p_sys->p_thread->p_fifo = block_FifoNew();
    p_sys->p_thread->p_empty_blocks = block_FifoNew();

    i_handle = net_ConnectDgram( p_this, psz_dst_addr, i_dst_port, -1,
                                 IPPROTO_UDP );
    free (psz_dst_addr);

    if( i_handle == -1 )
    {
         msg_Err( p_access, "failed to create raw UDP socket" );
         vlc_object_release (p_sys->p_thread);
         free (p_sys);
         return VLC_EGENERIC;
    }
    else
    {
        char addr[NI_MAXNUMERICHOST];
        int port;

        if (net_GetSockAddress (i_handle, addr, &port) == 0)
        {
            msg_Dbg (p_access, "source: %s port %d", addr, port);
            var_SetString (p_access, "src-addr", addr);
            var_SetInteger (p_access, "src-port", port);
        }

        if (net_GetPeerAddress (i_handle, addr, &port) == 0)
        {
            msg_Dbg (p_access, "destination: %s port %d", addr, port);
            var_SetString (p_access, "dst-addr", addr);
            var_SetInteger (p_access, "dst-port", port);
        }
    }
    p_sys->p_thread->i_handle = i_handle;
    shutdown( i_handle, SHUT_RD );

    p_sys->p_thread->i_caching =
        (int64_t)1000 * var_GetInteger( p_access, SOUT_CFG_PREFIX "caching");
    p_sys->p_thread->i_group =
        var_GetInteger( p_access, SOUT_CFG_PREFIX "group" );

    p_sys->i_mtu = var_CreateGetInteger( p_this, "mtu" );
    p_sys->p_buffer = NULL;

    if( vlc_thread_create( p_sys->p_thread, "sout write thread", ThreadWrite,
                           VLC_THREAD_PRIORITY_HIGHEST, false ) )
    {
        msg_Err( p_access->p_sout, "cannot spawn sout access thread" );
        net_Close (i_handle);
        vlc_object_release( p_sys->p_thread );
        free (p_sys);
        return VLC_EGENERIC;
    }