root/modules/demux/live555.cpp

/*****************************************************************************
 * live555.cpp : LIVE555 Streaming Media support.
 *****************************************************************************
 * Copyright (C) 2003-2007 the VideoLAN team
 * $Id$
 *
 * Authors: Laurent Aimar <fenrir@via.ecp.fr>
 *          Derk-Jan Hartman <hartman at videolan. org>
 *          Derk-Jan Hartman <djhartman at m2x .dot. nl> for M2X
 *
 * 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
 *****************************************************************************/

/* For inttypes.h
 * Note: config.h may include inttypes.h, so make sure we define this option
 * early enough. */
#define __STDC_CONSTANT_MACROS 1

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <inttypes.h>

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

#include <vlc_demux.h>
#include <vlc_interface.h>
#include <vlc_network.h>
#include <vlc_url.h>

#include <iostream>
#include <limits.h>


#if defined( WIN32 )
#   include <winsock2.h>
#endif

#include "UsageEnvironment.hh"
#include "BasicUsageEnvironment.hh"
#include "GroupsockHelper.hh"
#include "liveMedia.hh"

extern "C" {
#include "../access/mms/asf.h"  /* Who said ugly ? */
}

using namespace std;

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

#define CACHING_TEXT N_("Caching value (ms)")
#define CACHING_LONGTEXT N_( \
    "Allows you to modify the default caching value for RTSP streams. This " \
    "value should be set in millisecond units." )

#define KASENNA_TEXT N_( "Kasenna RTSP dialect")
#define KASENNA_LONGTEXT N_( "Kasenna servers use an old and unstandard " \
    "dialect of RTSP. When you set this parameter, VLC will try this dialect "\
    "for communication. In this mode you cannot connect to normal RTSP servers." )

#define USER_TEXT N_("RTSP user name")
#define USER_LONGTEXT N_("Allows you to modify the user name that will " \
    "be used for authenticating the connection.")
#define PASS_TEXT N_("RTSP password")
#define PASS_LONGTEXT N_("Allows you to modify the password that will be " \
    "used for the connection.")

vlc_module_begin();
    set_description( N_("RTP/RTSP/SDP demuxer (using Live555)" ) );
    set_capability( "demux", 50 );
    set_shortname( "RTP/RTSP");
    set_callbacks( Open, Close );
    add_shortcut( "live" );
    add_shortcut( "livedotcom" );
    set_category( CAT_INPUT );
    set_subcategory( SUBCAT_INPUT_DEMUX );

    add_submodule();
        set_description( N_("RTSP/RTP access and demux") );
        add_shortcut( "rtsp" );
        add_shortcut( "sdp" );
        set_capability( "access_demux", 0 );
        set_callbacks( Open, Close );
        add_bool( "rtsp-tcp", 0, NULL,
                  N_("Use RTP over RTSP (TCP)"),
                  N_("Use RTP over RTSP (TCP)"), true );
        add_integer( "rtp-client-port", -1, NULL,
                  N_("Client port"),
                  N_("Port to use for the RTP source of the session"), true );
        add_bool( "rtsp-mcast", false, NULL,
                  N_("Force multicast RTP via RTSP"),
                  N_("Force multicast RTP via RTSP"), true );
        add_bool( "rtsp-http", 0, NULL,
                  N_("Tunnel RTSP and RTP over HTTP"),
                  N_("Tunnel RTSP and RTP over HTTP"), true );
        add_integer( "rtsp-http-port", 80, NULL,
                  N_("HTTP tunnel port"),
                  N_("Port to use for tunneling the RTSP/RTP over HTTP."),
                  true );
        add_integer("rtsp-caching", 4 * DEFAULT_PTS_DELAY / 1000, NULL,
                    CACHING_TEXT, CACHING_LONGTEXT, true );
        add_bool(   "rtsp-kasenna", false, NULL, KASENNA_TEXT,
                    KASENNA_LONGTEXT, true );
        add_string( "rtsp-user", NULL, NULL, USER_TEXT,
                    USER_LONGTEXT, true );
        add_string( "rtsp-pwd", NULL, NULL, PASS_TEXT,
                    PASS_LONGTEXT, true );
vlc_module_end();


/*****************************************************************************
 * Local prototypes
 *****************************************************************************/

typedef struct
{
    demux_t         *p_demux;
    MediaSubsession *sub;

    es_format_t     fmt;
    es_out_id_t     *p_es;

    bool            b_muxed;
    bool            b_quicktime;
    bool            b_asf;
    stream_t        *p_out_muxed;    /* for muxed stream */

    uint8_t         *p_buffer;
    unsigned int    i_buffer;

    bool            b_rtcp_sync;
    char            waiting;
    int64_t         i_pts;
    float           i_npt;

} live_track_t;

struct timeout_thread_t
{
    VLC_COMMON_MEMBERS

    int64_t      i_remain;
    bool         b_handle_keep_alive;
    demux_sys_t  *p_sys;
};

struct demux_sys_t
{
    char            *p_sdp;    /* XXX mallocated */
    char            *psz_path; /* URL-encoded path */
    vlc_url_t       url;

    MediaSession     *ms;
    TaskScheduler    *scheduler;
    UsageEnvironment *env ;
    RTSPClient       *rtsp;

    /* */
    int              i_track;
    live_track_t     **track;   /* XXX mallocated */

    /* Weird formats */
    asf_header_t     asfh;
    stream_t         *p_out_asf;
    bool             b_real;

    /* */
    int64_t          i_pcr; /* The clock */
    float            i_npt;
    float            i_npt_length;
    float            i_npt_start;

    /* timeout thread information */
    int              i_timeout;     /* session timeout value in seconds */
    bool             b_timeout_call;/* mark to send an RTSP call to prevent server timeout */
    timeout_thread_t *p_timeout;    /* the actual thread that makes sure we don't timeout */

    /* */
    bool             b_force_mcast;
    bool             b_multicast;   /* if one of the tracks is multicasted */
    bool             b_no_data;     /* if we never received any data */
    int              i_no_data_ti;  /* consecutive number of TaskInterrupt */

    char             event;
};

static int Demux  ( demux_t * );
static int Control( demux_t *, int, va_list );

static int Connect      ( demux_t * );
static int SessionsSetup( demux_t * );
static int Play         ( demux_t *);
static int ParseASF     ( demux_t * );
static int RollOverTcp  ( demux_t * );

static void StreamRead  ( void *, unsigned int, unsigned int,
                          struct timeval, unsigned int );
static void StreamClose ( void * );
static void TaskInterrupt( void * );

static void* TimeoutPrevention( vlc_object_t * );

static unsigned char* parseH264ConfigStr( char const* configStr,
                                          unsigned int& configSize );

/*****************************************************************************
 * DemuxOpen:
 *****************************************************************************/
static int  Open ( vlc_object_t *p_this )
{
    demux_t     *p_demux = (demux_t*)p_this;
    demux_sys_t *p_sys = NULL;

    MediaSubsessionIterator *iter   = NULL;
    MediaSubsession         *sub    = NULL;
    int i, i_return;
    int i_error = VLC_EGENERIC;

    if( p_demux->s )
    {
        /* See if it looks like a SDP
           v, o, s fields are mandatory and in this order */
        const uint8_t *p_peek;
        if( stream_Peek( p_demux->s, &p_peek, 7 ) < 7 ) return VLC_EGENERIC;

        if( memcmp( p_peek, "v=0\r\n", 5 ) &&
            memcmp( p_peek, "v=0\n", 4 ) &&
            ( p_peek[0] < 'a' || p_peek[0] > 'z' || p_peek[1] != '=' ) )
        {
            return VLC_EGENERIC;
        }
    }
    else
    {
        var_Create( p_demux, "rtsp-caching", VLC_VAR_INTEGER|VLC_VAR_DOINHERIT );
    }

    p_demux->pf_demux  = Demux;
    p_demux->pf_control= Control;
    p_demux->p_sys     = p_sys = (demux_sys_t*)malloc( sizeof( demux_sys_t ) );
    if( !p_sys ) return VLC_ENOMEM;

    p_sys->p_sdp = NULL;
    p_sys->scheduler = NULL;
    p_sys->env = NULL;
    p_sys->ms = NULL;
    p_sys->rtsp = NULL;
    p_sys->i_track = 0;
    p_sys->track   = NULL;
    p_sys->i_pcr = 0;
    p_sys->i_npt = 0.;
    p_sys->i_npt_start = 0.;
    p_sys->i_npt_length = 0.;
    p_sys->p_out_asf = NULL;
    p_sys->b_no_data = true;
    p_sys->i_no_data_ti = 0;
    p_sys->p_timeout = NULL;
    p_sys->i_timeout = 0;
    p_sys->b_timeout_call = false;
    p_sys->b_multicast = false;
    p_sys->b_real = false;
    p_sys->psz_path = strdup( p_demux->psz_path );
    p_sys->b_force_mcast = var_CreateGetBool( p_demux, "rtsp-mcast" );

    /* parse URL for rtsp://[user:[passwd]@]serverip:port/options */
    vlc_UrlParse( &p_sys->url, p_sys->psz_path, 0 );

    if( ( p_sys->scheduler = BasicTaskScheduler::createNew() ) == NULL )
    {
        msg_Err( p_demux, "BasicTaskScheduler::createNew failed" );
        goto error;
    }
    if( !( p_sys->env = BasicUsageEnvironment::createNew(*p_sys->scheduler) ) )
    {
        msg_Err( p_demux, "BasicUsageEnvironment::createNew failed" );
        goto error;
    }

    if( strcasecmp( p_demux->psz_access, "sdp" ) )
    {
        char *p = p_sys->psz_path;
        while( (p = strchr( p, ' ' )) != NULL ) *p = '+';
    }

    if( p_demux->s != NULL )
    {
        /* Gather the complete sdp file */
        int     i_sdp       = 0;
        int     i_sdp_max   = 1000;
        uint8_t *p_sdp      = (uint8_t*) malloc( i_sdp_max );

        if( !p_sdp )
        {
            i_error = VLC_ENOMEM;
            goto error;
        }

        for( ;; )
        {
            int i_read = stream_Read( p_demux->s, &p_sdp[i_sdp],
                                      i_sdp_max - i_sdp - 1 );

            if( !vlc_object_alive (p_demux) || p_demux->b_error )
            {
                free( p_sdp );
                goto error;
            }

            if( i_read < 0 )
            {
                msg_Err( p_demux, "failed to read SDP" );
                free( p_sdp );
                goto error;
            }

            i_sdp += i_read;

            if( i_read < i_sdp_max - i_sdp - 1 )
            {
                p_sdp[i_sdp] = '\0';
                break;
            }

            i_sdp_max += 1000;
            p_sdp = (uint8_t*)realloc( p_sdp, i_sdp_max );
        }
        p_sys->p_sdp = (char*)p_sdp;
    }
    else if( ( p_demux->s == NULL ) &&
             !strcasecmp( p_demux->psz_access, "sdp" ) )
    {
        /* sdp:// link from SAP */
        p_sys->p_sdp = strdup( p_sys->psz_path );
    }
    else if( ( i_return = Connect( p_demux ) ) != VLC_SUCCESS )
    {
        msg_Err( p_demux, "Failed to connect with rtsp://%s", p_sys->psz_path );
        goto error;
    }

    if( p_sys->p_sdp == NULL )
    {
        msg_Err( p_demux, "Failed to retrieve the RTSP Session Description" );
        i_error = VLC_ENOMEM;
        goto error;
    }

    if( ( i_return = SessionsSetup( p_demux ) ) != VLC_SUCCESS )
    {
        msg_Err( p_demux, "Nothing to play for rtsp://%s", p_sys->psz_path );
        goto error;
    }

    if( p_sys->b_real ) goto error;

    if( ( i_return = Play( p_demux ) ) != VLC_SUCCESS )
        goto error;

    if( p_sys->p_out_asf && ParseASF( p_demux ) )
    {
        msg_Err( p_demux, "cannot find a usable asf header" );
        /* TODO Clean tracks */
        goto error;
    }

    if( p_sys->i_track <= 0 )
        goto error;

    return VLC_SUCCESS;

error:
    for( i = 0; i < p_sys->i_track; i++ )
    {
        live_track_t *tk = p_sys->track[i];

        if( tk->b_muxed ) stream_DemuxDelete( tk->p_out_muxed );
        es_format_Clean( &tk->fmt );
        free( tk->p_buffer );
        free( tk );
    }

    if( p_sys->i_track ) free( p_sys->track );
    if( p_sys->p_out_asf ) stream_DemuxDelete( p_sys->p_out_asf );
    if( p_sys->rtsp && p_sys->ms ) p_sys->rtsp->teardownMediaSession( *p_sys->ms );
    if( p_sys->ms ) Medium::close( p_sys->ms );
    if( p_sys->rtsp ) RTSPClient::close( p_sys->rtsp );
    if( p_sys->env ) p_sys->env->reclaim();
    if( p_sys->p_timeout )
    {
        vlc_object_kill( p_sys->p_timeout );
        vlc_thread_join( p_sys->p_timeout );
        vlc_object_detach( p_sys->p_timeout );
        vlc_object_release( p_sys->p_timeout );
    }
    delete p_sys->scheduler;
    free( p_sys->p_sdp );
    free( p_sys->psz_path );

    vlc_UrlClean( &p_sys->url );

    free( p_sys );
    return i_error;
}

/*****************************************************************************
 * DemuxClose:
 *****************************************************************************/
static void Close( vlc_object_t *p_this )
{
    demux_t *p_demux = (demux_t*)p_this;
    demux_sys_t *p_sys = p_demux->p_sys;
    int i;

    for( i = 0; i < p_sys->i_track; i++ )
    {
        live_track_t *tk = p_sys->track[i];

        if( tk->b_muxed ) stream_DemuxDelete( tk->p_out_muxed );
        es_format_Clean( &tk->fmt );
        free( tk->p_buffer );
        free( tk );
    }

    if( p_sys->i_track ) free( p_sys->track );
    if( p_sys->p_out_asf ) stream_DemuxDelete( p_sys->p_out_asf );
    if( p_sys->rtsp && p_sys->ms ) p_sys->rtsp->teardownMediaSession( *p_sys->ms );
    if( p_sys->ms ) Medium::close( p_sys->ms );
    if( p_sys->rtsp ) RTSPClient::close( p_sys->rtsp );
    if( p_sys->env ) p_sys->env->reclaim();
    if( p_sys->p_timeout )
    {
        vlc_object_kill( p_sys->p_timeout );
        vlc_thread_join( p_sys->p_timeout );
        vlc_object_detach( p_sys->p_timeout );
        vlc_object_release( p_sys->p_timeout );
    }
    delete p_sys->scheduler;
    free( p_sys->p_sdp );
    free( p_sys->psz_path );

    vlc_UrlClean( &p_sys->url );

    free( p_sys );
}

/*****************************************************************************
 * Connect: connects to the RTSP server to setup the session DESCRIBE
 *****************************************************************************/
static int Connect( demux_t *p_demux )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    Authenticator authenticator;
    bool b_firstpass  = true;
    char *psz_user    = NULL;
    char *psz_pwd     = NULL;
    char *psz_url     = NULL;
    char *psz_options = NULL;
    char *p_sdp       = NULL;
    int  i_http_port  = 0;
    int  i_ret        = VLC_SUCCESS;
    int i_lefttries;

    if( p_sys->url.i_port == 0 ) p_sys->url.i_port = 554;
    if( p_sys->url.psz_username || p_sys->url.psz_password )
    {
        int err;
        err = asprintf( &psz_url, "rtsp://%s:%d%s", p_sys->url.psz_host,
                        p_sys->url.i_port, p_sys->url.psz_path );
        if( err == -1 ) return VLC_ENOMEM;

        psz_user = strdup( p_sys->url.psz_username );
        psz_pwd  = strdup( p_sys->url.psz_password );
    }
    else
    {
        int err;
        err = asprintf( &psz_url, "rtsp://%s", p_sys->psz_path );
        if( err == -1 ) return VLC_ENOMEM;

        psz_user = var_CreateGetString( p_demux, "rtsp-user" );
        psz_pwd  = var_CreateGetString( p_demux, "rtsp-pwd" );
    }

    i_lefttries = 3;
createnew:
    i_lefttries--;
    if( !vlc_object_alive (p_demux) || p_demux->b_error )
    {
        free( psz_user );
        free( psz_pwd );
        free( psz_url );
        return VLC_EGENERIC;
    }

    if( var_CreateGetBool( p_demux, "rtsp-http" ) )
        i_http_port = var_CreateGetInteger( p_demux, "rtsp-http-port" );

    if( ( p_sys->rtsp = RTSPClient::createNew( *p_sys->env,
          var_CreateGetInteger( p_demux, "verbose" ) > 1,
          "VLC media player", i_http_port ) ) == NULL )
    {
        msg_Err( p_demux, "RTSPClient::createNew failed (%s)",
                 p_sys->env->getResultMsg() );
        free( psz_user );
        free( psz_pwd );
        free( psz_url );
        return VLC_EGENERIC;
    }

    /* Kasenna enables KeepAlive by analysing the User-Agent string. 
     * Appending _KA to the string should be enough to enable this feature, 
     * however, there is a bug where the _KA doesn't get parsed from the 
     * default User-Agent as created by VLC/Live555 code. This is probably due 
     * to spaces in the string or the string being too long. Here we override
     * the default string with a more compact version.
     */
    if( var_CreateGetBool( p_demux, "rtsp-kasenna" ))
    {
        p_sys->rtsp->setUserAgentString( "VLC_MEDIA_PLAYER_KA" );
    }

describe:
    authenticator.setUsernameAndPassword( (const char*)psz_user,
                                          (const char*)psz_pwd );

    psz_options = p_sys->rtsp->sendOptionsCmd( psz_url, psz_user, psz_pwd,
                                               &authenticator );
    delete [] psz_options;

    p_sdp = p_sys->rtsp->describeURL( psz_url, &authenticator,
                         var_GetBool( p_demux, "rtsp-kasenna" ) );
    if( p_sdp == NULL )
    {
        /* failure occurred */
        int i_code = 0;
        const char *psz_error = p_sys->env->getResultMsg();

        if( var_GetBool( p_demux, "rtsp-http" ) )
            sscanf( psz_error, "%*s %*s HTTP GET %*s HTTP/%*u.%*u %3u %*s",
                    &i_code );
        else
        {
            const char *psz_tmp = strstr( psz_error, "RTSP" );
            if( psz_tmp )
                sscanf( psz_tmp, "RTSP/%*s%3u", &i_code );
            else
                i_code = 0;
        }
        msg_Dbg( p_demux, "DESCRIBE failed with %d: %s", i_code, psz_error );

        if( b_firstpass )
        {   /* describeURL always returns an "RTSP/1.0 401 Unauthorized" the
             * first time. This is a workaround to avoid asking for a
             * user/passwd the first time the code passess here. */
            i_code = 0;
            b_firstpass = false;
        }

        if( i_code == 401 )
        {
            int i_result;
            msg_Dbg( p_demux, "authentication failed" );

            free( psz_user );
            free( psz_pwd );
            psz_user = psz_pwd = NULL;

            i_result = intf_UserLoginPassword( p_demux, _("RTSP authentication"),
                           _("Please enter a valid login name and a password."),
                                                   &psz_user, &psz_pwd );
            if( i_result == DIALOG_OK_YES )
            {
                msg_Dbg( p_demux, "retrying with user=%s, pwd=%s",
                         psz_user, psz_pwd );
                goto describe;
            }
        }
        else if( (i_code != 0) && !var_GetBool( p_demux, "rtsp-http" ) )
        {
            /* Perhaps a firewall is being annoying. Try HTTP tunneling mode */
            vlc_value_t val;
            val.b_bool = true;
            msg_Dbg( p_demux, "we will now try HTTP tunneling mode" );
            var_Set( p_demux, "rtsp-http", val );
            if( p_sys->rtsp ) RTSPClient::close( p_sys->rtsp );
            p_sys->rtsp = NULL;
            goto createnew;
        }
        else
        {
            msg_Dbg( p_demux, "connection timeout, retrying" );
            if( p_sys->rtsp ) RTSPClient::close( p_sys->rtsp );
            p_sys->rtsp = NULL;
            if( i_lefttries > 0 )
                goto createnew;
        }
        i_ret = VLC_EGENERIC;
    }

    /* malloc-ated copy */
    free( psz_url );
    free( psz_user );
    free( psz_pwd );

    free( p_sys->p_sdp );
    p_sys->p_sdp = NULL;
    if( p_sdp ) p_sys->p_sdp = strdup( (char*)p_sdp );
    delete[] p_sdp;

    return i_ret;
}

/*****************************************************************************
 * SessionsSetup: prepares the subsessions and does the SETUP
 *****************************************************************************/
static int SessionsSetup( demux_t *p_demux )
{
    demux_sys_t             *p_sys  = p_demux->p_sys;
    MediaSubsessionIterator *iter   = NULL;
    MediaSubsession         *sub    = NULL;

    bool           b_rtsp_tcp = false;
    int            i_client_port;
    int            i_return = VLC_SUCCESS;
    unsigned int   i_buffer = 0;
    unsigned const thresh = 200000; /* RTP reorder threshold .2 second (default .1) */

    b_rtsp_tcp    = var_CreateGetBool( p_demux, "rtsp-tcp" ) ||
                    var_GetBool( p_demux, "rtsp-http" );
    i_client_port = var_CreateGetInteger( p_demux, "rtp-client-port" );

    /* Create the session from the SDP */
    if( !( p_sys->ms = MediaSession::createNew( *p_sys->env, p_sys->p_sdp ) ) )
    {
        msg_Err( p_demux, "Could not create the RTSP Session: %s",
            p_sys->env->getResultMsg() );
        return VLC_EGENERIC;
    }

    /* Initialise each media subsession */
    iter = new MediaSubsessionIterator( *p_sys->ms );
    while( ( sub = iter->next() ) != NULL )
    {
        Boolean bInit;
        live_track_t *tk;

        if( !vlc_object_alive (p_demux) || p_demux->b_error )
        {
            delete iter;
            return VLC_EGENERIC;
        }

        /* Value taken from mplayer */
        if( !strcmp( sub->mediumName(), "audio" ) )
            i_buffer = 100000;
        else if( !strcmp( sub->mediumName(), "video" ) )
            i_buffer = 2000000;
        else continue;

        if( i_client_port != -1 )
        {
            sub->setClientPortNum( i_client_port );
            i_client_port += 2;
        }

        if( strcasestr( sub->codecName(), "REAL" ) )
        {
            msg_Info( p_demux, "real codec detected, using real-RTSP instead" );
            p_sys->b_real = true; /* This is a problem, we'll handle it later */
            continue;
        }

        if( !strcmp( sub->codecName(), "X-ASF-PF" ) )
            bInit = sub->initiate( 4 ); /* Constant ? */
        else
            bInit = sub->initiate();

        if( !bInit )
        {
            msg_Warn( p_demux, "RTP subsession '%s/%s' failed (%s)",
                      sub->mediumName(), sub->codecName(),
                      p_sys->env->getResultMsg() );
        }
        else
        {
            if( sub->rtpSource() != NULL )
            {
                int fd = sub->rtpSource()->RTPgs()->socketNum();

                /* Increase the buffer size */
                if( i_buffer > 0 )
                    increaseReceiveBufferTo( *p_sys->env, fd, i_buffer );

                /* Increase the RTP reorder timebuffer just a bit */
                sub->rtpSource()->setPacketReorderingThresholdTime(thresh);
            }
            msg_Dbg( p_demux, "RTP subsession '%s/%s'", sub->mediumName(),
                     sub->codecName() );

            /* Issue the SETUP */
            if( p_sys->rtsp )
            {
                if( !p_sys->rtsp->setupMediaSubsession( *sub, False,
                                           b_rtsp_tcp ? True : False,
                                           ( p_sys->b_force_mcast && !b_rtsp_tcp ) ? True : False ) )
                {
                    /* if we get an unsupported transport error, toggle TCP use and try again */
                    if( !strstr(p_sys->env->getResultMsg(), "461 Unsupported Transport")
                     || !p_sys->rtsp->setupMediaSubsession( *sub, False,
                                           b_rtsp_tcp ? False : True,
                                           False ) )
                    {
                        msg_Err( p_demux, "SETUP of'%s/%s' failed %s", sub->mediumName(),
                                 sub->codecName(), p_sys->env->getResultMsg() );
                        continue;
                    }
                }
            }

            /* Check if we will receive data from this subsession for this track */
            if( sub->readSource() == NULL ) continue;
            if( !p_sys->b_multicast )
            {
                /* Check, because we need diff. rollover behaviour for multicast */
                p_sys->b_multicast = IsMulticastAddress( sub->connectionEndpointAddress() );
            }

            tk = (live_track_t*)malloc( sizeof( live_track_t ) );
            if( !tk )
            {
                delete iter;
                return VLC_ENOMEM;
            }
            tk->p_demux     = p_demux;
            tk->sub         = sub;
            tk->p_es        = NULL;
            tk->b_quicktime = false;
            tk->b_asf       = false;
            tk->b_muxed     = false;
            tk->p_out_muxed = NULL;
            tk->waiting     = 0;
            tk->b_rtcp_sync = false;
            tk->i_pts       = 0;
            tk->i_npt       = 0.;
            tk->i_buffer    = 65536;
            tk->p_buffer    = (uint8_t *)malloc( 65536 );
            if( !tk->p_buffer )
            {
                delete iter;
                return VLC_ENOMEM;
            }

            /* Value taken from mplayer */
            if( !strcmp( sub->mediumName(), "audio" ) )
            {
                es_format_Init( &tk->fmt, AUDIO_ES, VLC_FOURCC('u','n','d','f') );
                tk->fmt.audio.i_channels = sub->numChannels();
                tk->fmt.audio.i_rate = sub->rtpTimestampFrequency();

                if( !strcmp( sub->codecName(), "MPA" ) ||
                    !strcmp( sub->codecName(), "MPA-ROBUST" ) ||
                    !strcmp( sub->codecName(), "X-MP3-DRAFT-00" ) )
                {
                    tk->fmt.i_codec = VLC_FOURCC( 'm', 'p', 'g', 'a' );
                    tk->fmt.audio.i_rate = 0;
                }
                else if( !strcmp( sub->codecName(), "AC3" ) )
                {
                    tk->fmt.i_codec = VLC_FOURCC( 'a', '5', '2', ' ' );
                    tk->fmt.audio.i_rate = 0;
                }
                else if( !strcmp( sub->codecName(), "L16" ) )
                {
                    tk->fmt.i_codec = VLC_FOURCC( 't', 'w', 'o', 's' );
                    tk->fmt.audio.i_bitspersample = 16;
                }
                else if( !strcmp( sub->codecName(), "L8" ) )
                {
                    tk->fmt.i_codec = VLC_FOURCC( 'a', 'r', 'a', 'w' );
                    tk->fmt.audio.i_bitspersample = 8;
                }
                else if( !strcmp( sub->codecName(), "PCMU" ) )
                {
                    tk->fmt.i_codec = VLC_FOURCC( 'u', 'l', 'a', 'w' );
                }
                else if( !strcmp( sub->codecName(), "PCMA" ) )
                {
                    tk->fmt.i_codec = VLC_FOURCC( 'a', 'l', 'a', 'w' );
                }
                else if( !strncmp( sub->codecName(), "G726", 4 ) )
                {
                    tk->fmt.i_codec = VLC_FOURCC( 'g', '7', '2', '6' );
                    tk->fmt.audio.i_rate = 8000;
                    tk->fmt.audio.i_channels = 1;
                    if( !strcmp( sub->codecName()+5, "40" ) )
                        tk->fmt.i_bitrate = 40000;
                    else if( !strcmp( sub->codecName()+5, "32" ) )
                        tk->fmt.i_bitrate = 32000;
                    else if( !strcmp( sub->codecName()+5, "24" ) )
                        tk->fmt.i_bitrate = 24000;
                    else if( !strcmp( sub->codecName()+5, "16" ) )
                        tk->fmt.i_bitrate = 16000;
                }
                else if( !strcmp( sub->codecName(), "AMR" ) )
                {
                    tk->fmt.i_codec = VLC_FOURCC( 's', 'a', 'm', 'r' );
                }
                else if( !strcmp( sub->codecName(), "AMR-WB" ) )
                {
                    tk->fmt.i_codec = VLC_FOURCC( 's', 'a', 'w', 'b' );
                }
                else if( !strcmp( sub->codecName(), "MP4A-LATM" ) )
                {
                    unsigned int i_extra;
                    uint8_t      *p_extra;

                    tk->fmt.i_codec = VLC_FOURCC( 'm', 'p', '4', 'a' );

                    if( ( p_extra = parseStreamMuxConfigStr( sub->fmtp_config(),
                                                             i_extra ) ) )
                    {
                        tk->fmt.i_extra = i_ex