/***************************************************************************** * mpgv.c : MPEG-I/II Video demuxer ***************************************************************************** * Copyright (C) 2001-2004 the VideoLAN team * $Id: 6e3df761770eae49567bfca00d8a334bfb49aa09 $ * * Authors: Laurent Aimar <fenrir@via.ecp.fr> * * 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 <vlc_demux.h>#include <vlc_codec.h>/***************************************************************************** * Module descriptor *****************************************************************************/static int  Open ( vlc_object_t * );static void Close( vlc_object_t * );vlc_module_begin();    set_category( CAT_INPUT );    set_subcategory( SUBCAT_INPUT_DEMUX );    set_description( N_("MPEG-I/II video demuxer" ) );    set_capability( "demux", 100 );    set_callbacks( Open, Close );    add_shortcut( "mpgv" );vlc_module_end();/***************************************************************************** * Local prototypes *****************************************************************************/struct demux_sys_t{    bool  b_start;    es_out_id_t *p_es;    decoder_t *p_packetizer;};static int Demux( demux_t * );static int Control( demux_t *, int, va_list );#define MPGV_PACKET_SIZE 4096/***************************************************************************** * Open: initializes demux structures *****************************************************************************/static int Open( vlc_object_t * p_this ){    demux_t     *p_demux = (demux_t*)p_this;    demux_sys_t *p_sys;    bool   b_forced = false;    const uint8_t *p_peek;    es_format_t  fmt;    if( stream_Peek( p_demux->s, &p_peek, 4 ) < 4 )    {        msg_Err( p_demux, "cannot peek" );        return VLC_EGENERIC;    }    if( p_demux->b_force )        b_forced = true;    if( p_peek[0] != 0x00 || p_peek[1] != 0x00 || p_peek[2] != 0x01 )    {        if( !b_forced ) return VLC_EGENERIC;        msg_Err( p_demux, "this doesn't look like an MPEG ES stream, continuing" );    }    if( p_peek[3] > 0xb9 )    {        if( !b_forced ) return VLC_EGENERIC;        msg_Err( p_demux, "this seems to be a system stream (PS plug-in ?), but continuing" );    }    p_demux->pf_demux  = Demux;    p_demux->pf_control= Control;    p_demux->p_sys     = p_sys = malloc( sizeof( demux_sys_t ) );    p_sys->b_start     = true;    p_sys->p_es        = NULL;    /* Load the mpegvideo packetizer */    INIT_VPACKETIZER( p_sys->p_packetizer,  'm', 'p', 'g', 'v' );    es_format_Init( &p_sys->p_packetizer->fmt_out, UNKNOWN_ES, 0 );    LOAD_PACKETIZER_OR_FAIL( p_sys->p_packetizer, "MPEG Video" );    /* create the output */    es_format_Init( &fmt, VIDEO_ES, VLC_FOURCC( 'm', 'p', 'g', 'v' ) );    p_sys->p_es = es_out_Add( p_demux->out, &fmt );    return VLC_SUCCESS;}/***************************************************************************** * Close: frees unused data *****************************************************************************/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;    DESTROY_PACKETIZER( p_sys->p_packetizer );    free( p_sys );}/***************************************************************************** * Demux: reads and demuxes data packets ***************************************************************************** * Returns -1 in case of error, 0 in case of EOF, 1 otherwise *****************************************************************************/static int Demux( demux_t *p_demux ){    demux_sys_t  *p_sys = p_demux->p_sys;    block_t *p_block_in, *p_block_out;    if( ( p_block_in = stream_Block( p_demux->s, MPGV_PACKET_SIZE ) ) == NULL )    {        return 0;    }    if( p_sys->b_start )    {        p_block_in->i_pts =        p_block_in->i_dts = 1;    }    else    {        p_block_in->i_pts =        p_block_in->i_dts = 0;    }    while( (p_block_out = p_sys->p_packetizer->pf_packetize( p_sys->p_packetizer, &p_block_in )) )    {        p_sys->b_start = false;        while( p_block_out )        {            block_t *p_next = p_block_out->p_next;            es_out_Control( p_demux->out, ES_OUT_SET_PCR, p_block_out->i_dts );            p_block_out->p_next = NULL;            es_out_Send( p_demux->out, p_sys->p_es, p_block_out );            p_block_out = p_next;        }    }    return 1;}/***************************************************************************** * Control: *****************************************************************************/static int Control( demux_t *p_demux, int i_query, va_list args ){    /* demux_sys_t *p_sys  = p_demux->p_sys; */    /* FIXME calculate the bitrate */    if( i_query == DEMUX_SET_TIME )        return VLC_EGENERIC;    else        return demux_vaControlHelper( p_demux->s,                                       0, -1,                                       0, 1, i_query, args );}