root/modules/demux/real.c

/*****************************************************************************
 * real.c: Real demuxer.
 *****************************************************************************
 * Copyright (C) 2004, 2006-2007 the VideoLAN team
 * $Id$
 *
 * 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.
 *****************************************************************************/

/**
 * Status of this demuxer:
 * Real Media format
 * -----------------
 *
 * version v3 w/ 14_4/lpcJ is ok.
 * version v4/5: - atrac3 is ok.
 *               - cook is ok.
 *               - raac, racp are ok.
 *               - dnet is twisted "The byte order of the data is reversed
 *                                  from standard AC3"
 *               - 28_8 seem problematic.
 *               - sipr should be fine, but our decoder suxx :)
 *               - ralf is unsupported, but hardly any sample exist.
 *               - mp3 is unsupported, one sample exists...
 *
 * Real Audio Only
 * ---------------
 * v3 and v4/5 headers are parsed.
 * Doesn't work yet...
 */

/*****************************************************************************
 * Preamble
 *****************************************************************************/

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

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

#include <vlc_demux.h>
#include <vlc_charset.h>
#include <vlc_meta.h>

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

vlc_module_begin();
    set_description( N_("Real demuxer" ) );
    set_capability( "demux", 15 );
    set_category( CAT_INPUT );
    set_subcategory( SUBCAT_INPUT_DEMUX );
    set_callbacks( Open, Close );
    add_shortcut( "real" );
    add_shortcut( "rm" );
vlc_module_end();

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

typedef struct
{
    int         i_id;
    es_format_t fmt;

    es_out_id_t *p_es;

    int         i_frame;
    block_t     *p_frame;

    int         i_subpacket_h;
    int         i_subpacket_size;
    int         i_coded_frame_size;
    int         i_frame_size;

    int         i_subpacket;
    int         i_subpackets;
    block_t     **p_subpackets;
    int64_t     *p_subpackets_timecode;
    int         i_out_subpacket;

} real_track_t;

typedef struct
{
    uint32_t file_offset;
    uint32_t time_offset;
    uint32_t frame_index;
} rm_index_t;

struct demux_sys_t
{
    int64_t  i_data_offset;
    int64_t  i_data_size;
    uint32_t i_data_packets_count;
    uint32_t i_data_packets;
    int64_t  i_data_offset_next;

    bool     b_is_real_audio;

    int  i_our_duration;
    int  i_mux_rate;

    char* psz_title;
    char* psz_artist;
    char* psz_copyright;
    char* psz_description;

    int          i_track;
    real_track_t **track;

    uint8_t buffer[65536];

    int64_t     i_pcr;
    vlc_meta_t *p_meta;

    int64_t     i_index_offset;
    int         b_seek;
    rm_index_t *p_index;
};

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

static int HeaderRead( demux_t *p_demux );
static const uint8_t * MetaRead( demux_t *p_demux, const uint8_t *p_peek );
static int ReadCodecSpecificData( demux_t *p_demux, int i_len, int i_num );

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

    const uint8_t *p_peek;
    bool           b_is_real_audio = false;

    if( stream_Peek( p_demux->s, &p_peek, 10 ) < 10 ) return VLC_EGENERIC;

    /* Real Audio */
    if( !memcmp( p_peek, ".ra", 3 ) )
    {
        msg_Err( p_demux, ".ra files unsuported" );
        b_is_real_audio = true;
    }
    /* Real Media Format */
    else if( memcmp( p_peek, ".RMF", 4 ) ) return VLC_EGENERIC;

    /* Fill p_demux field */
    p_demux->pf_demux = Demux;
    p_demux->pf_control = Control;

    p_demux->p_sys = p_sys = malloc( sizeof( demux_sys_t ) );
    if( p_sys == NULL )
        return VLC_ENOMEM;

    memset( p_sys, 0, sizeof( demux_sys_t ) );

    p_sys->i_data_offset = 0;
    p_sys->i_track = 0;
    p_sys->track   = NULL;
    p_sys->i_pcr   = 1;

    p_sys->b_seek  = 0;
    p_sys->b_is_real_audio = b_is_real_audio;

    /* Parse the headers */
    /* Real Audio files */
    if( b_is_real_audio )
    {
        ReadCodecSpecificData( p_demux, 32, 0 ); /* At least 32 */
        return VLC_EGENERIC;                     /* We don't know how to read
                                                    correctly the data yet */
    }
    /* RMF files */
    else if( HeaderRead( p_demux ) )
    {
        int i;
        msg_Err( p_demux, "invalid header" );
        for( i = 0; i < p_sys->i_track; i++ )
        {
            real_track_t *tk = p_sys->track[i];

            if( tk->p_es )
            {
                es_out_Del( p_demux->out, tk->p_es );
            }
            free( tk );
        }
        if( p_sys->i_track > 0 )
        {
            free( p_sys->track );
        }
        free( p_sys );
        return VLC_EGENERIC;
    }

    return VLC_SUCCESS;
}

/*****************************************************************************
 * Close
 *****************************************************************************/
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++ )
    {
        real_track_t *tk = p_sys->track[i];
        int j = tk->i_subpackets;

        if( tk->p_frame ) block_Release( tk->p_frame );
        es_format_Clean( &tk->fmt );

        while(  j-- )
        {
            if( tk->p_subpackets[ j ] )
                block_Release( tk->p_subpackets[ j ] );
        }
        if( tk->i_subpackets )
        {
            free( tk->p_subpackets );
            free( tk->p_subpackets_timecode );
        }

        free( tk );
    }

    free( p_sys->psz_title );
    free( p_sys->psz_artist );
    free( p_sys->psz_copyright );
    free( p_sys->psz_description );
    free( p_sys->p_index );

    if( p_sys->i_track > 0 ) free( p_sys->track );
    free( p_sys );
}


/*****************************************************************************
 * Demux:
 *****************************************************************************/
static int Demux( demux_t *p_demux )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    uint8_t     header[18];
    int         i_id, i_flags, i;
    unsigned int i_size;
    int64_t     i_pts;
    real_track_t *tk = NULL;
    bool  b_selected;

    if( p_sys->i_data_packets >= p_sys->i_data_packets_count &&
        p_sys->i_data_packets_count )
    {
        if( stream_Read( p_demux->s, header, 18 ) < 18 )
        {
            return 0;
        }
        if( strncmp( (char *)header, "DATA", 4 ) )
        {
            return 0;
        }
        p_sys->i_data_offset = stream_Tell( p_demux->s ) - 18;
        p_sys->i_data_size   = GetDWBE( &header[4] );
        p_sys->i_data_packets_count = GetDWBE( &header[10] );
        p_sys->i_data_packets = 0;
        p_sys->i_data_offset_next = GetDWBE( &header[14] );

        msg_Dbg( p_demux, "entering new DATA packets=%d next=%u",
                 p_sys->i_data_packets_count,
                 (uint32_t)p_sys->i_data_offset_next );
    }

    if( stream_Read( p_demux->s, header, 12 ) < 12 ) return 0;

    //    int i_version = GetWBE( &header[0] );
    i_size = GetWBE( &header[2] ) - 12;
    i_id   = GetWBE( &header[4] );
    i_pts  = 1000 * GetDWBE( &header[6] );
    i_pts += 1000; /* Avoid 0 pts */
    i_flags= header[11]; /* flags 0x02 -> keyframe */

    msg_Dbg( p_demux, "packet %d size=%d id=%d pts=%u",
             p_sys->i_data_packets, i_size, i_id, (uint32_t)(i_pts/1000) );

    p_sys->i_data_packets++;

    if( i_size == 0 )
    {
        msg_Err( p_demux, "Got a NUKK size to read. (Invalid format?)" );
        return 1;
    }

    if( i_size > sizeof(p_sys->buffer) )
    {
        msg_Err( p_demux, "Got a size to read bigger than our buffer. (Invalid format?)" );
        return 1;
    }

    stream_Read( p_demux->s, p_sys->buffer, i_size );

    for( i = 0; i < p_sys->i_track; i++ )
    {
        if( p_sys->track[i]->i_id == i_id ) tk = p_sys->track[i];
    }

    if( tk == NULL )
    {
        msg_Warn( p_demux, "unknown track id(0x%x)", i_id );
        return 1;
    }
    es_out_Control( p_demux->out, ES_OUT_GET_ES_STATE, tk->p_es, &b_selected );

    if( tk->fmt.i_cat == VIDEO_ES && b_selected )
    {
        uint8_t *p = p_sys->buffer;

        while( p < &p_sys->buffer[i_size - 2] )
        {
            uint8_t h = *p++;
            int     i_len = 0;
            int     i_copy;
            int     i_subseq = 0;
            int     i_seqnum = 0;
            int     i_offset = 0;

            if( (h&0xc0) == 0x40 )
            {
                /* Short header */
                p++;
                i_len = &p_sys->buffer[i_size] - p;
            }
            else
            {
                if( (h&0x40) == 0 )
                {
                    i_subseq = (*p++)&0x7f;
                }
                i_len = (p[0] << 8)|p[1]; p += 2;
                if( (i_len&0xc000) == 0 )
                {
                    i_len <<= 16;
                    i_len |= (p[0] << 8)|p[1]; p += 2;
                    i_len &= 0x3fffffff;
                }
                else
                {
                    i_len &= 0x3fff;
                }

                i_offset = (p[0] << 8)|p[1]; p += 2;
                if( (i_offset&0xc000) == 0 )
                {
                    i_offset <<= 16;
                    i_offset |= (p[0] << 8)|p[1]; p += 2;
                    i_offset &= 0x3fffffff;
                }
                else
                {
                    i_offset &= 0x3fff;
                }
                i_seqnum = *p++;
            }

            i_copy = i_len - i_offset;
            if( i_copy > &p_sys->buffer[i_size] - p )
            {
                i_copy = &p_sys->buffer[i_size] - p;
            }
            else if( i_copy < 0 )
            {
                break;
            }

            msg_Dbg( p_demux, "    - len=%d offset=%d size=%d subseq=%d seqnum=%d",
                     i_len, i_offset, i_copy, i_subseq, i_seqnum );

            if( (h&0xc0) == 0x80 )
            {
                /* last fragment -> fixes */
                i_copy = i_offset;
                i_offset = i_len - i_copy;
                msg_Dbg( p_demux, "last fixing copy=%d offset=%d",
                         i_copy, i_offset );
            }

            if( tk->p_frame &&
                ( tk->p_frame->i_dts != i_pts ||
                  tk->i_frame != i_len ) )
            {
                msg_Dbg( p_demux, "sending size=%zu", tk->p_frame->i_buffer );

                es_out_Send( p_demux->out, tk->p_es, tk->p_frame );

                tk->i_frame = 0;
                tk->p_frame = NULL;
            }

            if( (h&0xc0) != 0x80 && (h&0xc0) != 0x00 && !tk->p_frame )
            {
                /* no fragment */
                i_len = i_copy;
                i_offset = 0;
            }


            if( tk->p_frame == NULL )
            {
                msg_Dbg( p_demux, "new frame size=%d", i_len );
                tk->i_frame = i_len;
                if( !( tk->p_frame = block_New( p_demux, i_len + 8 + 1000) ) )
                {
                    return -1;
                }
                memset( &tk->p_frame->p_buffer[8], 0, i_len );
                tk->p_frame->i_dts = i_pts;
                tk->p_frame->i_pts = i_pts;

                ((uint32_t*)tk->p_frame->p_buffer)[0] = i_len;  /* len */
                ((uint32_t*)tk->p_frame->p_buffer)[1] = 0;      /* chunk counts */
            }

            if( i_offset < tk->i_frame)
            {
                int i_ck = ((uint32_t*)tk->p_frame->p_buffer)[1]++;

                msg_Dbg( p_demux, "copying new buffer n=%d offset=%d copy=%d",
                         i_ck, i_offset, i_copy );

                ((uint32_t*)(tk->p_frame->p_buffer+i_len+8))[i_ck*2 +0 ] = 1;
                ((uint32_t*)(tk->p_frame->p_buffer+i_len+8))[i_ck*2 +1 ] = i_offset;


                memcpy( &tk->p_frame->p_buffer[i_offset + 8], p, i_copy );
            }

            p += i_copy;

            if( (h&0xc0) != 0x80 )
            {
                break;
            }

#if 0
            if( tk->p_frame )
            {
                /* append data */
                int i_ck = ((uint32_t*)tk->p_frame->p_buffer)[1]++;

                if( (h&0xc0) == 0x80 )
                {
                    /* last fragment */
                    i_copy = i_offset;
                    i_offset = i_len - i_offset;

                    ((uint32_t*)(tk->p_frame->p_buffer+i_len+8))[i_ck] = i_offset;
                    memcpy( &tk->p_frame->p_buffer[i_offset+ 8], p, i_copy );
                    p += i_copy;

                    if( p_sys->i_pcr < tk->p_frame->i_dts )
                    {
                        p_sys->i_pcr = tk->p_frame->i_dts;
                        es_out_Control( p_demux->out, ES_OUT_SET_PCR,
                                        (int64_t)p_sys->i_pcr );
                    }
                    es_out_Send( p_demux->out, tk->p_es, tk->p_frame );

                    tk->i_frame = 0;
                    tk->p_frame = NULL;

                    continue;
                }

                ((uint32_t*)(tk->p_frame->p_buffer+i_len+8))[i_ck] = i_offset;
                memcpy( &tk->p_frame->p_buffer[i_offset + 8], p, i_copy );
                break;
            }

            if( (h&0xc0) != 0x00 )
            {
                block_t *p_frame;

                /* not fragmented */
                if( !( p_frame = block_New( p_demux, i_copy + 8 + 8 ) ) )
                {
                    return -1;
                }
                p_frame->i_dts = i_pts;
                p_frame->i_pts = i_pts;

                ((uint32_t*)p_frame->p_buffer)[0] = i_copy;
                ((uint32_t*)p_frame->p_buffer)[1] = 1;
                ((uint32_t*)(p_frame->p_buffer+i_copy+8))[0] = 0;
                memcpy( &p_frame->p_buffer[8], p, i_copy );

                p += i_copy;

                if( p_sys->i_pcr < p_frame->i_dts )
                {
                    p_sys->i_pcr = p_frame->i_dts;
                    es_out_Control( p_demux->out, ES_OUT_SET_PCR,
                                    (int64_t)p_sys->i_pcr );
                }
                es_out_Send( p_demux->out, tk->p_es, p_frame );
            }
            else
            {
                /* First fragment */
                tk->i_frame = i_len;
                if( !( tk->p_frame = block_New( p_demux, i_len + 8 + 1000) ) )
                {
                    return -1;
                }
                memset( &tk->p_frame->p_buffer[8], 0, i_len );
                tk->p_frame->i_dts = i_pts;
                tk->p_frame->i_pts = i_pts;

                ((uint32_t*)tk->p_frame->p_buffer)[0] = i_len;  /* len */
                ((uint32_t*)tk->p_frame->p_buffer)[1] = 1;      /* chunk counts */
                ((uint32_t*)(tk->p_frame->p_buffer+i_len+8))[0] = i_offset;
                memcpy( &tk->p_frame->p_buffer[i_offset + 8], p, i_copy );

                break;
            }
#endif
        }
    }
    else if( tk->fmt.i_cat == AUDIO_ES && b_selected )
    {
        if( tk->fmt.i_codec == VLC_FOURCC( 'c', 'o', 'o', 'k' ) ||
            tk->fmt.i_codec == VLC_FOURCC( 'a', 't', 'r', 'c') ||
            tk->fmt.i_codec == VLC_FOURCC( 's', 'i', 'p', 'r') ||
            tk->fmt.i_codec == VLC_FOURCC( '2', '8', '_', '8') )
        {
            uint8_t *p_buf = p_sys->buffer;
            int y = tk->i_subpacket / ( tk->i_frame_size /tk->i_subpacket_size);
            int i_index, i;

            /* Sanity check */
            if( i_flags & 2 || ( p_sys->b_seek ) )
            {
                y = tk->i_subpacket = 0;
                tk->i_out_subpacket = 0;
                p_sys->b_seek = 0;
            }

            if( tk->fmt.i_codec == VLC_FOURCC( 'c', 'o', 'o', 'k' ) ||
                tk->fmt.i_codec == VLC_FOURCC( 'a', 't', 'r', 'c' ))
            {
                int num = tk->i_frame_size / tk->i_subpacket_size;
                for( i = 0; i <  num; i++ )
                {
                    block_t *p_block = block_New( p_demux, tk->i_subpacket_size );
                    memcpy( p_block->p_buffer, p_buf, tk->i_subpacket_size );
                    p_buf += tk->i_subpacket_size;

                    i_index = tk->i_subpacket_h * i +
                        ((tk->i_subpacket_h + 1) / 2) * (y&1) + (y>>1);

                    if ( tk->p_subpackets[i_index]  != NULL )
                    {
                        msg_Dbg(p_demux, "p_subpackets[ %d ] not null!",  i_index );
                        free( tk->p_subpackets[i_index] );
                    }

                    tk->p_subpackets[i_index] = p_block;
                    tk->i_subpacket++;
                    p_block->i_dts = p_block->i_pts = 0;
                }
                tk->p_subpackets_timecode[tk->i_subpacket - num] = i_pts;
            }

            if( tk->fmt.i_codec == VLC_FOURCC( '2', '8', '_', '8' ) ||
                tk->fmt.i_codec == VLC_FOURCC( 's', 'i', 'p', 'r' ) )
            for( i = 0; i < tk->i_subpacket_h / 2; i++ )
            {
                block_t *p_block = block_New( p_demux, tk->i_coded_frame_size);
                memcpy( p_block->p_buffer, p_buf, tk->i_coded_frame_size );
                p_buf += tk->i_coded_frame_size;

                i_index = (i * 2 * tk->i_frame_size) /
                    tk->i_coded_frame_size + y;

                p_block->i_dts = p_block->i_pts = i_pts;
                tk->p_subpackets[i_index] = p_block;
                tk->i_subpacket++;
            }

            while( tk->i_out_subpacket != tk->i_subpackets &&
                   tk->p_subpackets[tk->i_out_subpacket] )
            {
                /* Set the PCR */
#if 0
                if (tk->i_out_subpacket == 0)
                {
                    p_sys->i_pcr = tk->p_subpackets[tk->i_out_subpacket]->i_dts;
                    es_out_Control( p_demux->out, ES_OUT_SET_PCR,
                            (int64_t)p_sys->i_pcr );
                }

                block_t *p_block = tk->p_subpackets[tk->i_out_subpacket];
                tk->p_subpackets[tk->i_out_subpacket] = 0;

                if( tk->i_out_subpacket ) p_block->i_dts = p_block->i_pts = 0;
#endif

                block_t *p_block = tk->p_subpackets[tk->i_out_subpacket];
                tk->p_subpackets[tk->i_out_subpacket] = 0;
                if ( tk->p_subpackets_timecode[tk->i_out_subpacket]  )
                {
                    p_block->i_dts = p_block->i_pts =
                        tk->p_subpackets_timecode[tk->i_out_subpacket];
                    tk->p_subpackets_timecode[tk->i_out_subpacket] = 0;

                    p_sys->i_pcr = p_block->i_dts;
                    es_out_Control( p_demux->out, ES_OUT_SET_PCR,
                            (int64_t)p_sys->i_pcr );
                }
                es_out_Send( p_demux->out, tk->p_es, p_block );

                tk->i_out_subpacket++;
            }

            if( tk->i_subpacket == tk->i_subpackets &&
                tk->i_out_subpacket != tk->i_subpackets )
            {
                msg_Warn( p_demux, "i_subpacket != i_out_subpacket, "
                          "this shouldn't happen" );
            }

            if( tk->i_subpacket == tk->i_subpackets )
            {
                tk->i_subpacket = 0;
                tk->i_out_subpacket = 0;
            }
        }
        else
        {
            /* Set PCR */
            if( p_sys->i_pcr < i_pts )
            {
                p_sys->i_pcr = i_pts;
                es_out_Control( p_demux->out, ES_OUT_SET_PCR,
                        (int64_t)p_sys->i_pcr );
            }

            if( tk->fmt.i_codec == VLC_FOURCC( 'm','p','4','a' ) )
            {
                int     i_sub = (p_sys->buffer[1] >> 4)&0x0f;
                uint8_t *p_sub = &p_sys->buffer[2+2*i_sub];

                int i;
                for( i = 0; i < i_sub; i++ )
                {
                    int i_sub_size = GetWBE( &p_sys->buffer[2+i*2]);
                    block_t *p_block = block_New( p_demux, i_sub_size );
                    if( p_block )
                    {
                        memcpy( p_block->p_buffer, p_sub, i_sub_size );
                        p_sub += i_sub_size;

                        p_block->i_dts =
                            p_block->i_pts = ( i == 0 ? i_pts : 0 );

                        es_out_Send( p_demux->out, tk->p_es, p_block );
                    }
                }
            }
            else
            {
                block_t *p_block = block_New( p_demux, i_size );

                if( tk->fmt.i_codec == VLC_FOURCC( 'a', '5', '2', ' ' ) )
                {
                    uint8_t *src = p_sys->buffer;
                    uint8_t *dst = p_block->p_buffer;

                    /* byte swap data */
                    while( dst < &p_block->p_buffer[i_size- 1])
                    {
                        *dst++ = src[1];
                        *dst++ = src[0];

                        src += 2;
                    }
                }
                else
                {
                    memcpy( p_block->p_buffer, p_sys->buffer, i_size );
                }
                p_block->i_dts = p_block->i_pts = i_pts;
                es_out_Send( p_demux->out, tk->p_es, p_block );
            }
        }
    }


    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;
    double f, *pf;
    int64_t i64;
    rm_index_t * p_index;
    int64_t *pi64;

    switch( i_query )
    {
        case DEMUX_GET_POSITION:
            pf = (double*) va_arg( args, double* );

            if( p_sys->i_our_duration > 0 )
            {
                *pf = (double)p_sys->i_pcr / 1000.0 / p_sys->i_our_duration;
                return VLC_SUCCESS;
            }

            /* read stream size maybe failed in rtsp streaming, 
               so use duration to determin the position at first  */
            i64 = stream_Size( p_demux->s );
            if( i64 > 0 )
            {
                *pf = (double)1.0*stream_Tell( p_demux->s ) / (double)i64;
            }
            else
            {
                *pf = 0.0;
            }
            return VLC_SUCCESS;

        case DEMUX_GET_TIME:
            pi64 = (int64_t*)va_arg( args, int64_t * );

            if( p_sys->i_our_duration > 0 )
            {
                *pi64 = p_sys->i_pcr;
                return VLC_SUCCESS;
            }

            /* same as GET_POSTION */
            i64 = stream_Size( p_demux->s );
            if( p_sys->i_our_duration > 0 && i64 > 0 )
            {
                *pi64 = (int64_t)( 1000.0 * p_sys->i_our_duration * stream_Tell( p_demux->s ) / i64 );
                return VLC_SUCCESS;
            }

            *pi64 = 0;
            return VLC_EGENERIC;

        case DEMUX_SET_POSITION:
            f = (double) va_arg( args, double );
            i64 = (int64_t) ( stream_Size( p_demux->s ) * f );

            if ( p_sys->i_index_offset == 0 && i64 != 0 )
            {
                msg_Err(p_demux,"Seek No Index Real File failed!" );
                return VLC_EGENERIC; // no index!
            }
            if ( i64 == 0 )
            {
                /* it is a rtsp stream , it is specials in access/rtsp/... */
                msg_Dbg(p_demux, "Seek in real rtsp stream!");
                p_sys->i_pcr = (int64_t)1000 * ( p_sys->i_our_duration * f  );

                es_out_Control( p_demux->out, ES_OUT_RESET_PCR , p_sys->i_pcr );
                p_sys->b_seek = 1;

                return stream_Seek( p_demux->s, p_sys->i_pcr );
            }

            if ( p_sys->i_index_offset > 0 )
            {
                p_index = p_sys->p_index;
                while( p_index->file_offset !=0 )
                {
                    if ( p_index->file_offset > i64 )
                    {
                        msg_Dbg( p_demux, "Seek Real find! %d %d %d",
                                 p_index->time_offset, p_index->file_offset,
                                 (uint32_t) i64 );
                        if ( p_index != p_sys->p_index ) p_index --;
                        i64 = p_index->file_offset;
                        break;
                    }
                    p_index++;
                }

                p_sys->i_pcr = 1000 * (int64_t) p_index->time_offset;

                es_out_Control( p_demux->out, ES_OUT_RESET_PCR , p_sys->i_pcr );

                return stream_Seek( p_demux->s, i64 );
            }
        case DEMUX_SET_TIME:
            i64 = (int64_t) va_arg( args, int64_t ) / 1000;

            p_index = p_sys->p_index;
            while( p_index->file_offset !=0 )
            {
                if ( p_index->time_offset > i64 )
                {
                    if ( p_index != p_sys->p_index )
                        p_index --;
                    i64 = p_index->file_offset;
                    break;
                }
                p_index++;
            }

            p_sys->i_pcr = 1000 * (int64_t) p_index->time_offset;
            es_out_Control( p_demux->out, ES_OUT_RESET_PCR , p_sys->i_pcr );

            return stream_Seek( p_demux->s, i64 );

        case DEMUX_GET_LENGTH:
            pi64 = (int64_t*)va_arg( args, int64_t * );
 
            /* the commented following lines are fen's implementation, which doesn't seem to
             * work for one reason or another -- FK */
            /*if( p_sys->i_mux_rate > 0 )
            {
                *pi64 = (int64_t)1000000 * ( stream_Size( p_demux->s ) / 50 ) / p_sys->i_mux_rate;
                return VLC_SUCCESS;
            }*/
            if( p_sys->i_our_duration > 0 )
            {
                /* our stored duration is in ms, so... */
                *pi64 = (int64_t)1000 * p_sys->i_our_duration;
 
                return VLC_SUCCESS;
            }
            *pi64 = 0;
            return VLC_EGENERIC;

        case DEMUX_GET_META:
        {
            vlc_meta_t *p_meta = (vlc_meta_t*)va_arg( args, vlc_meta_t* );

            /* the core will crash if we provide NULL strings, so check
             * every string first */
            if( p_sys->psz_title )
                vlc_meta_SetTitle( p_meta, p_sys->psz_title );
            if( p_sys->psz_artist )
                vlc_meta_SetArtist( p_meta, p_sys->psz_artist );
            if( p_sys->psz_copyright )
                vlc_meta_SetCopyright( p_meta, p_sys->psz_copyright );
            if( p_sys->psz_description )
                vlc_meta_SetDescription( p_meta, p_sys->psz_description );
            return VLC_SUCCESS;
        }

        case DEMUX_GET_FPS:
        default:
            return VLC_EGENERIC;
    }
    return VLC_EGENERIC;
}

/*****************************************************************************
 * ReadRealIndex:
 *****************************************************************************/

static void ReadRealIndex( demux_t *p_demux )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    uint8_t       buffer[100];
    uint32_t      i_id;
    uint32_t      i_size;
    int           i_version;
&n