sgimb.c

video linux conference

/*****************************************************************************
 * sgimb.c: a meta demux to parse sgimb referrer files
 *****************************************************************************
 * Copyright (C) 2004 VideoLAN
 * $Id: sgimb.c 9961 2005-02-16 22:01:41Z robux4 $
 *
 * Authors: Derk-Jan Hartman <hartman 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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
 *****************************************************************************/

/*****************************************************************************
 * This is a metademux for the Kasenna MediaBase metafile format.
 * Kasenna MediaBase first returns this file when you are trying to access
 * their MPEG streams (MIME: application/x-sgimb). Very few applications
 * understand this format and the format is not really documented on the net.
 * Following a typical MediaBase file. Notice the sgi prefix of all the elements.
 * This stems from the fact that the MediaBase servers were first introduced by SGI?????.
 *
 * sgiNameServerHost=host.name.tld
 *     Obvious: the host hosting this stream
 * Stream="xdma://host.name.tld/demo/a_very_cool.mpg"
 *     Not always present. xdma can be read as RTSP.
 * sgiMovieName=/demo/a_very_cool.mpg
 *     The path to the asset
 * sgiAuxState=1|2
 *     AuxState=2 is always Video On Demand (so not Scheduled)
 *     Not present with Live streams
 * sgiLiveFeed=True|False
 *     Denounces if the stream is live or from assets (Canned?)
 *     Live appears as a little sattelite dish in the web interface of Kasenna
 * sgiFormatName=PARTNER_41_MPEG-4
 *     The type of stream. One of:
 *       PARTNER_41_MPEG-4 (RTSP MPEG-4 fully compliant)
 *       MPEG1-Audio       (MP3 Audio streams in MPEG TS)
 *       MPEG-1            (MPEG 1 A/V in MPEG TS)
 *       MPEG-2            (MPEG 2 A/V in MPEG TS)
 * sgiWidth=720
 *     The width of the to be received stream. Only present if stream is not Live.
 * sgiHeight=576
 *     The height of the to be received stream. Only present if stream is not Live.
 * sgiBitrate=1630208
 *     The bitrate of the to be received stream. Only present if stream is not Live.
 * sgiDuration=378345000
 *     The duration of the to be received stream. Only present if stream is not Live.
 * sgiQTFileBegin
 * rtsptext
 * rtsp://host.name.tld/demo/a_very_cool.mpg
 * sgiQTFileEnd
 *     Sometimes present. QT will recognize this as a RTSP reference file, if present.
 * sgiApplicationName=MediaBaseURL
 *     Beats me !! :)
 * sgiElapsedTime=0
 *     Time passed since the asset was started (resets for repeating non live assets?)
 * sgiMulticastAddress=233.81.233.15
 *     The multicast IP used for the Multicast feed.
 *     Also defines if a stream is multicast or not. (blue dot in kasenna web interface)
 * sgiMulticastPort=1234
 *     The multicast port for the same Multicast feed.
 * sgiPacketSize=16384
 *     The packetsize of the UDP frames that Kasenna sends. They should have used a default
 *     that is a multiple of 188 (TS frame size). Most networks don't support more than 1500 anyways.
 *     Also, when you loose a frame of this size, imagecorruption is more likely then with smaller
 *     frames.
 * sgiServerVersion=6.1.2
 *     Version of the server
 * sgiRtspPort=554
 *     TCP port used for RTSP communication
 * AutoStart=True
 *     Start playing automatically
 * DeliveryService=cds
 *     Simulcasted (scheduled unicast) content. (Green dot in Kasenna web interface) 
 * sgiShowingName=A nice name that everyone likes
 *     A human readible descriptive title for this stream.
 * sgiSid=2311
 *     Looks like this is the ID of the scheduled asset?
 * sgiUserAccount=pid=1724&time=1078527309&displayText=You%20are%20logged%20as%20guest&
 *     User Authentication. Above is a default guest entry. Not required for RTSP communication.
 * sgiUserPassword=
 *     Password :)
 *
 *****************************************************************************/


/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <stdlib.h>                                      /* malloc(), free() */

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

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
static int  Activate  ( vlc_object_t * );
static void Deactivate( vlc_object_t * );

vlc_module_begin();
    set_description( _("Kasenna MediaBase metademux") );
    set_category( CAT_INPUT );
    set_subcategory( SUBCAT_INPUT_DEMUX );
    set_capability( "demux2", 170 );
    set_callbacks( Activate, Deactivate );
    add_shortcut( "sgimb" );
vlc_module_end();

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
#define MAX_LINE 1024

struct demux_sys_t
{
    char        *psz_uri;       /* Stream= or sgiQTFileBegin rtsp link */
    char        *psz_server;    /* sgiNameServerHost= */
    char        *psz_location;  /* sgiMovieName= */
    char        *psz_name;      /* sgiShowingName= */
    char        *psz_user;      /* sgiUserAccount= */
    char        *psz_password;  /* sgiUserPassword= */
    char        *psz_mcast_ip;  /* sgiMulticastAddress= */
    int         i_mcast_port;   /* sgiMulticastPort= */
    int         i_packet_size;  /* sgiPacketSize= */
    mtime_t     i_duration;     /* sgiDuration= */
    int         i_port;         /* sgiRtspPort= */
    int         i_sid;          /* sgiSid= */
    vlc_bool_t  b_concert;      /* DeliveryService=cds */
    vlc_bool_t  b_rtsp_kasenna; /* kasenna style RTSP */
};

static int Demux ( demux_t *p_demux );
static int Control( demux_t *p_demux, int i_query, va_list args );

/*****************************************************************************
 * Activate: initializes m3u demux structures
 *****************************************************************************/
static int Activate( vlc_object_t * p_this )
{
    demux_t *p_demux = (demux_t *)p_this;
    demux_sys_t *p_sys;
    byte_t *p_peek;
    int i_size;

    /* Lets check the content to see if this is a sgi mediabase file */
    i_size = stream_Peek( p_demux->s, &p_peek, MAX_LINE );
    i_size -= sizeof("sgiNameServerHost=") - 1;
    if ( i_size > 0 )
    {
        while ( i_size && strncasecmp( p_peek, "sgiNameServerHost=",
                                       sizeof("sgiNameServerHost=") - 1 ) )
        {
            p_peek++;
            i_size--;
        }
        if ( !strncasecmp( p_peek, "sgiNameServerHost=",
                           sizeof("sgiNameServerHost=") -1 ) )
        {
            p_demux->pf_demux = Demux;
            p_demux->pf_control = Control;

            p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
            p_sys->psz_uri = NULL;
            p_sys->psz_server = NULL;
            p_sys->psz_location = NULL;
            p_sys->psz_name = NULL;
            p_sys->psz_user = NULL;
            p_sys->psz_password = NULL;
            p_sys->psz_mcast_ip = NULL;
            p_sys->i_mcast_port = 0;
            p_sys->i_packet_size = 0;
            p_sys->i_duration = 0;
            p_sys->i_port = 0;
            p_sys->i_sid = 0;
            p_sys->b_rtsp_kasenna = VLC_FALSE;
            p_sys->b_concert = VLC_FALSE;

            return VLC_SUCCESS;
        }
    }
    return VLC_EGENERIC;
}

/*****************************************************************************
 * Deactivate: frees unused data
 *****************************************************************************/
static void Deactivate( vlc_object_t *p_this )
{
    demux_t *p_demux = (demux_t*)p_this;
    demux_sys_t *p_sys = p_demux->p_sys;
    if( p_sys->psz_uri )
        free( p_sys->psz_uri );
    if( p_sys->psz_server )
        free( p_sys->psz_server );
    if( p_sys->psz_location )
        free( p_sys->psz_location );
    if( p_sys->psz_name )
        free( p_sys->psz_name );
    if( p_sys->psz_user )
        free( p_sys->psz_user );
    if( p_sys->psz_password )
        free( p_sys->psz_password );
    if( p_sys->psz_mcast_ip )
        free( p_sys->psz_mcast_ip );
    free( p_demux->p_sys );
    return;
}

static int ParseLine ( demux_t *p_demux, char *psz_line )
{
    char        *psz_bol;
    demux_sys_t *p_sys = p_demux->p_sys;