real.c

uclinux 下的vlc播放器源代码

/*****************************************************************************
 * real.c: Real demuxer.
 *****************************************************************************
 * Copyright (C) 2004, 2006 the VideoLAN team
 * $Id: real.c 16987 2006-10-08 12:54:12Z jpsaman $
 *
 * Authors: Laurent Aimar <[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
 *****************************************************************************/
#include <stdlib.h>                                      /* malloc(), free() */

#include <vlc/vlc.h>
#include <vlc/input.h>
#include "charset.h"

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

vlc_module_begin();
    set_description( _("Real demuxer" ) );
    set_capability( "demux2", 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;
    int         i_out_subpacket;

} real_track_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;

    int  i_our_duration;
    int  i_mux_rate;

    int          i_track;
    real_track_t **track;

    uint8_t buffer[65536];

    int64_t     i_pcr;
    
    vlc_meta_t *p_meta;
};

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 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;

    uint8_t     *p_peek;

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


    /* Parse the headers */
    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 );
    }

    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_size, i_id, i_flags, i;
    int64_t     i_pts;
    real_track_t *tk = NULL;
    vlc_bool_t  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;

    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 */

#if 0
    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) );
#endif

    p_sys->i_data_packets++;

    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=%d", tk->p_frame->i_buffer );

                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;
            }

            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 );