asf.c

uclinux 下的vlc播放器源代码

        tk->p_es = NULL;
        tk->p_frame = NULL;

        /* Check (in case of mms) if this track is selected (ie will receive data) */
        if( !stream_Control( p_demux->s, STREAM_CONTROL_ACCESS, ACCESS_GET_PRIVATE_ID_STATE,
                             p_sp->i_stream_number, &b_access_selected ) &&
            !b_access_selected )
        {
            tk->i_cat = UNKNOWN_ES;
            msg_Dbg( p_demux, "ignoring not selected stream(ID:%d) (by access)",
                     p_sp->i_stream_number );
            continue;
        }

        if( ASF_CmpGUID( &p_sp->i_stream_type, &asf_object_stream_type_audio ) &&
            p_sp->i_type_specific_data_length >= sizeof( WAVEFORMATEX ) - 2 )
        {
            es_format_t fmt;
            uint8_t *p_data = p_sp->p_type_specific_data;
            int i_format;

            es_format_Init( &fmt, AUDIO_ES, 0 );
            i_format = GetWLE( &p_data[0] );
            wf_tag_to_fourcc( i_format, &fmt.i_codec, NULL );
            fmt.audio.i_channels        = GetWLE(  &p_data[2] );
            fmt.audio.i_rate      = GetDWLE( &p_data[4] );
            fmt.i_bitrate         = GetDWLE( &p_data[8] ) * 8;
            fmt.audio.i_blockalign      = GetWLE(  &p_data[12] );
            fmt.audio.i_bitspersample   = GetWLE(  &p_data[14] );

            if( p_sp->i_type_specific_data_length > sizeof( WAVEFORMATEX ) &&
                i_format != WAVE_FORMAT_MPEGLAYER3 &&
                i_format != WAVE_FORMAT_MPEG )
            {
                fmt.i_extra = __MIN( GetWLE( &p_data[16] ),
                                     p_sp->i_type_specific_data_length -
                                     sizeof( WAVEFORMATEX ) );
                fmt.p_extra = malloc( fmt.i_extra );
                memcpy( fmt.p_extra, &p_data[sizeof( WAVEFORMATEX )],
                        fmt.i_extra );
            }

            tk->i_cat = AUDIO_ES;
            tk->p_es = es_out_Add( p_demux->out, &fmt );
            es_format_Clean( &fmt );

            msg_Dbg( p_demux, "added new audio stream(codec:0x%x,ID:%d)",
                    GetWLE( p_data ), p_sp->i_stream_number );
        }
        else if( ASF_CmpGUID( &p_sp->i_stream_type,
                              &asf_object_stream_type_video ) &&
                 p_sp->i_type_specific_data_length >= 11 +
                 sizeof( BITMAPINFOHEADER ) )
        {
            es_format_t  fmt;
            uint8_t      *p_data = &p_sp->p_type_specific_data[11];

            es_format_Init( &fmt, VIDEO_ES,
                            VLC_FOURCC( p_data[16], p_data[17],
                                        p_data[18], p_data[19] ) );
            fmt.video.i_width = GetDWLE( p_data + 4 );
            fmt.video.i_height= GetDWLE( p_data + 8 );


            if( fmt.i_codec == VLC_FOURCC( 'D','V','R',' ') )
            {
                /* DVR-MS special ASF */
                fmt.i_codec = VLC_FOURCC( 'm','p','g','2' ) ;
                fmt.b_packetized = VLC_FALSE;
            }

            if( p_sp->i_type_specific_data_length > 11 +
                sizeof( BITMAPINFOHEADER ) )
            {
                fmt.i_extra = __MIN( GetDWLE( p_data ),
                                     p_sp->i_type_specific_data_length - 11 -
                                     sizeof( BITMAPINFOHEADER ) );
                fmt.p_extra = malloc( fmt.i_extra );
                memcpy( fmt.p_extra, &p_data[sizeof( BITMAPINFOHEADER )],
                        fmt.i_extra );
            }

            /* Look for an aspect ratio */
            if( p_sys->p_root->p_metadata )
            {
                asf_object_metadata_t *p_meta = p_sys->p_root->p_metadata;
                int i_aspect_x = 0, i_aspect_y = 0;
                unsigned int i;

                for( i = 0; i < p_meta->i_record_entries_count; i++ )
                {
                    if( !strcmp( p_meta->record[i].psz_name, "AspectRatioX" ) )
                    {
                        if( (!i_aspect_x && !p_meta->record[i].i_stream) ||
                            p_meta->record[i].i_stream ==
                            p_sp->i_stream_number )
                            i_aspect_x = p_meta->record[i].i_val;
                    }
                    if( !strcmp( p_meta->record[i].psz_name, "AspectRatioY" ) )
                    {
                        if( (!i_aspect_y && !p_meta->record[i].i_stream) ||
                            p_meta->record[i].i_stream ==
                            p_sp->i_stream_number )
                            i_aspect_y = p_meta->record[i].i_val;
                    }
                }

                if( i_aspect_x && i_aspect_y )
                {
                    fmt.video.i_aspect = i_aspect_x *
                        (int64_t)fmt.video.i_width * VOUT_ASPECT_FACTOR /
                        fmt.video.i_height / i_aspect_y;
                }
	    }

            tk->i_cat = VIDEO_ES;
            tk->p_es = es_out_Add( p_demux->out, &fmt );
            es_format_Clean( &fmt );

            msg_Dbg( p_demux, "added new video stream(ID:%d)",
                     p_sp->i_stream_number );
        }
        else if( ASF_CmpGUID( &p_sp->i_stream_type, &asf_object_extended_stream_header ) &&
            p_sp->i_type_specific_data_length >= 64 )
        {
            /* Now follows a 64 byte header of which we don't know much */
            es_format_t fmt;
            guid_t  *p_ref  = (guid_t *)p_sp->p_type_specific_data;
            uint8_t *p_data = p_sp->p_type_specific_data + 64;
            unsigned int i_data = p_sp->i_type_specific_data_length - 64;

            msg_Dbg( p_demux, "Ext stream header detected. datasize = %d", p_sp->i_type_specific_data_length );
            if( ASF_CmpGUID( p_ref, &asf_object_extended_stream_type_audio ) && 
                i_data >= sizeof( WAVEFORMATEX ) - 2)
            {
                int      i_format;
                es_format_Init( &fmt, AUDIO_ES, 0 );
                i_format = GetWLE( &p_data[0] );
                if( i_format == 0 ) 
                    fmt.i_codec = VLC_FOURCC( 'a','5','2',' ');
                else
                    wf_tag_to_fourcc( i_format, &fmt.i_codec, NULL );
                fmt.audio.i_channels        = GetWLE(  &p_data[2] );
                fmt.audio.i_rate      = GetDWLE( &p_data[4] );
                fmt.i_bitrate         = GetDWLE( &p_data[8] ) * 8;
                fmt.audio.i_blockalign      = GetWLE(  &p_data[12] );
                fmt.audio.i_bitspersample   = GetWLE(  &p_data[14] );
                fmt.b_packetized = VLC_TRUE;

                if( p_sp->i_type_specific_data_length > sizeof( WAVEFORMATEX ) &&
                    i_format != WAVE_FORMAT_MPEGLAYER3 &&
                    i_format != WAVE_FORMAT_MPEG )
                {
                    fmt.i_extra = __MIN( GetWLE( &p_data[16] ),
                                         p_sp->i_type_specific_data_length -
                                         sizeof( WAVEFORMATEX ) );
                    fmt.p_extra = malloc( fmt.i_extra );
                    memcpy( fmt.p_extra, &p_data[sizeof( WAVEFORMATEX )],
                        fmt.i_extra );
                }

                tk->i_cat = AUDIO_ES;
                tk->p_es = es_out_Add( p_demux->out, &fmt );
                es_format_Clean( &fmt );

                msg_Dbg( p_demux, "added new audio stream (codec:0x%x,ID:%d)",
                    i_format, p_sp->i_stream_number );
            }
        }
        else
        {
            tk->i_cat = UNKNOWN_ES;
            msg_Dbg( p_demux, "ignoring unknown stream(ID:%d)",
                     p_sp->i_stream_number );
        }
    }

    p_sys->i_data_begin = p_sys->p_root->p_data->i_object_pos + 50;
    if( p_sys->p_root->p_data->i_object_size != 0 )
    { /* local file */
        p_sys->i_data_end = p_sys->p_root->p_data->i_object_pos +
                                    p_sys->p_root->p_data->i_object_size;
    }
    else
    { /* live/broacast */
        p_sys->i_data_end = -1;
    }


    /* go to first packet */
    stream_Seek( p_demux->s, p_sys->i_data_begin );

    /* try to calculate movie time */
    if( p_sys->p_fp->i_data_packets_count > 0 )
    {
        int64_t i_count;
        int64_t i_size = stream_Size( p_demux->s );

        if( p_sys->i_data_end > 0 && i_size > p_sys->i_data_end )
        {
            i_size = p_sys->i_data_end;
        }

        /* real number of packets */
        i_count = ( i_size - p_sys->i_data_begin ) /
                  p_sys->p_fp->i_min_data_packet_size;

        /* calculate the time duration in micro-s */
        p_sys->i_length = (mtime_t)p_sys->p_fp->i_play_duration / 10 *
                   (mtime_t)i_count /
                   (mtime_t)p_sys->p_fp->i_data_packets_count;

        if( p_sys->i_length > 0 )
        {
            p_sys->i_bitrate = 8 * i_size * (int64_t)1000000 / p_sys->i_length;
        }
    }

    /* Create meta information */
    p_sys->meta = vlc_meta_New();

    if( ( p_cd = ASF_FindObject( p_sys->p_root->p_hdr,
                                 &asf_object_content_description_guid, 0 ) ) )
    {
        if( p_cd->psz_title && *p_cd->psz_title )
        {
            vlc_meta_Add( p_sys->meta, VLC_META_TITLE, p_cd->psz_title );
        }
        if( p_cd->psz_author && *p_cd->psz_author )
        {
             vlc_meta_Add( p_sys->meta, VLC_META_AUTHOR, p_cd->psz_author );
        }
        if( p_cd->psz_copyright && *p_cd->psz_copyright )
        {
            vlc_meta_Add( p_sys->meta, VLC_META_COPYRIGHT, p_cd->psz_copyright );
        }
        if( p_cd->psz_description && *p_cd->psz_description )
        {
            vlc_meta_Add( p_sys->meta, VLC_META_DESCRIPTION, p_cd->psz_description );
        }
        if( p_cd->psz_rating && *p_cd->psz_rating )
        {
            vlc_meta_Add( p_sys->meta, VLC_META_RATING, p_cd->psz_rating );
        }
    }
    for( i_stream = 0, i = 0; i < 128; i++ )
    {
        asf_object_codec_list_t *p_cl = ASF_FindObject( p_sys->p_root->p_hdr,
                                                        &asf_object_codec_list_guid, 0 );

        if( p_sys->track[i] )
        {
            vlc_meta_t *tk = vlc_meta_New();
            TAB_APPEND( p_sys->meta->i_track, p_sys->meta->track, tk );

            if( p_cl && i_stream < p_cl->i_codec_entries_count )
            {
                if( p_cl->codec[i_stream].psz_name &&
                    *p_cl->codec[i_stream].psz_name )
                {
                    vlc_meta_Add( tk, VLC_META_CODEC_NAME,
                                  p_cl->codec[i_stream].psz_name );
                }
                if( p_cl->codec[i_stream].psz_description &&
                    *p_cl->codec[i_stream].psz_description )
                {
                    vlc_meta_Add( tk, VLC_META_CODEC_DESCRIPTION,
                                  p_cl->codec[i_stream].psz_description );
                }
            }
            i_stream++;
        }
    }

    es_out_Control( p_demux->out, ES_OUT_RESET_PCR );
    return VLC_SUCCESS;

error:
    ASF_FreeObjectRoot( p_demux->s, p_sys->p_root );
    return VLC_EGENERIC;
}
/*****************************************************************************
 *
 *****************************************************************************/
static void DemuxEnd( demux_t *p_demux )
{
    demux_sys_t *p_sys = p_demux->p_sys;
    int         i;

    if( p_sys->p_root )
    {
        ASF_FreeObjectRoot( p_demux->s, p_sys->p_root );
        p_sys->p_root = NULL;
    }
    if( p_sys->meta )
    {
        vlc_meta_Delete( p_sys->meta );
        p_sys->meta = NULL;
    }

    for( i = 0; i < 128; i++ )
    {
        asf_track_t *tk = p_sys->track[i];

        if( tk )
        {
            if( tk->p_frame )
            {
                block_ChainRelease( tk->p_frame );
            }
            if( tk->p_es )
            {
                es_out_Del( p_demux->out, tk->p_es );
            }
            free( tk );
        }
        p_sys->track[i] = 0;
    }
}