コード例 #1
0
ファイル: es_userdata.c プロジェクト: mackworth/ccextractor
// Parse the user data for captions. The udtype variable denotes
// to which type of data it belongs:
// 0 .. sequence header
// 1 .. GOP header
// 2 .. picture header
// Return TRUE if the data parsing finished, FALSE otherwise.
// estream->pos is advanced. Data is only processed if ustream->error
// is FALSE, parsing can set ustream->error to TRUE.
int user_data(struct lib_cc_decode *ctx, struct bitstream *ustream, int udtype, struct cc_subtitle *sub)
{
    dbg_print(CCX_DMT_VERBOSE, "user_data(%d)\n", udtype);

    // Shall not happen
    if (ustream->error || ustream->bitsleft <= 0)
    {
        // ustream->error=1;
        return 0; // Actually discarded on call.
        // CFS: Seen in a Wobble edited file.
        // fatal(CCX_COMMON_EXIT_BUG_BUG, "user_data: Impossible!");
    }

    // Do something
    ctx->stat_numuserheaders++;
    //header+=4;

    unsigned char *ud_header = next_bytes(ustream, 4);
    if (ustream->error || ustream->bitsleft <= 0)
    {
        return 0;  // Actually discarded on call.
        // CFS: Seen in Stick_VHS.mpg.
        // fatal(CCX_COMMON_EXIT_BUG_BUG, "user_data: Impossible!");
    }

    // DVD CC header, see
    // <http://www.theneitherworld.com/mcpoodle/SCC_TOOLS/DOCS/SCC_FORMAT.HTML>
    if ( !memcmp(ud_header,"\x43\x43", 2 ) )
    {
        ctx->stat_dvdccheaders++;

        // Probably unneeded, but keep looking for extra caption blocks
        int maybeextracb = 1;

        read_bytes(ustream, 4); // "43 43 01 F8"

        unsigned char pattern_flag = (unsigned char) read_bits(ustream,1);
        read_bits(ustream,1);
        int capcount=(int) read_bits(ustream,5);
        int truncate_flag = (int) read_bits(ustream,1); // truncate_flag - one CB extra

        int field1packet = 0; // expect Field 1 first
        if (pattern_flag == 0x00)
            field1packet=1; // expect Field 1 second

        dbg_print(CCX_DMT_VERBOSE, "Reading %d%s DVD CC segments\n",
                  capcount, (truncate_flag?"+1":""));

        capcount += truncate_flag;

        // This data comes before the first frame header, so
        // in order to get the correct timing we need to set the
        // current time to one frame after the maximum time of the
        // last GOP.  Only usefull when there are frames before
        // the GOP.
        if (ctx->timing->fts_max > 0)
            ctx->timing->fts_now = ctx->timing->fts_max + (LLONG) (1000.0/current_fps);

        int rcbcount = 0;
        for (int i=0; i<capcount; i++)
        {
            for (int j=0; j<2; j++)
            {
                unsigned char data[3];
                data[0]=read_u8(ustream);
                data[1]=read_u8(ustream);
                data[2]=read_u8(ustream);

                // Obey the truncate flag.
                if ( truncate_flag && i == capcount-1 && j == 1 )
                {
                    maybeextracb = 0;
                    break;
                }
                /* Field 1 and 2 data can be in either order,
                   with marker bytes of \xff and \xfe
                   Since markers can be repeated, use pattern as well */
                if ((data[0]&0xFE) == 0xFE) // Check if valid
                {
                    if (data[0]==0xff && j==field1packet)
                        data[0]=0x04; // Field 1
                    else
                        data[0]=0x05; // Field 2
                    do_cb(ctx, data, sub);
                    rcbcount++;
                }
                else
                {
                    dbg_print(CCX_DMT_VERBOSE, "Illegal caption segment - stop here.\n");
                    maybeextracb = 0;
                    break;
                }
            }
        }
        // Theoretically this should not happen, oh well ...
        // Deal with extra closed captions some DVD have.
        int ecbcount = 0;
        while ( maybeextracb && (next_u8(ustream)&0xFE) == 0xFE )
        {
            for (int j=0; j<2; j++)
            {
                unsigned char data[3];
                data[0]=read_u8(ustream);
                data[1]=read_u8(ustream);
                data[2]=read_u8(ustream);
                /* Field 1 and 2 data can be in either order,
                   with marker bytes of \xff and \xfe
                   Since markers can be repeated, use pattern as well */
                if ((data[0]&0xFE) == 0xFE) // Check if valid
                {
                    if (data[0]==0xff && j==field1packet)
                        data[0]=0x04; // Field 1
                    else
                        data[0]=0x05; // Field 2
                    do_cb(ctx, data, sub);
                    ecbcount++;
                }
                else
                {
                    dbg_print(CCX_DMT_VERBOSE, "Illegal (extra) caption segment - stop here.\n");
                    maybeextracb = 0;
                    break;
                }
            }
        }

        dbg_print(CCX_DMT_VERBOSE, "Read %d/%d DVD CC blocks\n", rcbcount, ecbcount);
    }
    // SCTE 20 user data
    else if (!ctx->noscte20 && ud_header[0] == 0x03)
    {
        if ((ud_header[1]&0x7F) == 0x01)
        {
            unsigned char cc_data[3*31+1]; // Maximum cc_count is 31

            ctx->stat_scte20ccheaders++;
            read_bytes(ustream, 2); // "03 01"

            unsigned cc_count = (unsigned int) read_bits(ustream,5);
            dbg_print(CCX_DMT_VERBOSE, "Reading %d SCTE 20 CC blocks\n", cc_count);

            unsigned field_number;
            unsigned cc_data1;
            unsigned cc_data2;

            for (unsigned j=0; j<cc_count; j++)
            {
                skip_bits(ustream,2); // priority - unused
                field_number = (unsigned int) read_bits(ustream,2);
                skip_bits(ustream,5); // line_offset - unused
                cc_data1 = (unsigned int) read_bits(ustream,8);
                cc_data2 = (unsigned int) read_bits(ustream,8);
                read_bits(ustream,1); // TODO: Add syntax check */

                if (ustream->bitsleft < 0)
                    fatal(CCX_COMMON_EXIT_BUG_BUG, "Oops!");

                // Field_number is either
                //  0 .. forbiden
                //  1 .. field 1 (odd)
                //  2 .. field 2 (even)
                //  3 .. repeated, from repeat_first_field, effectively field 1
                if (field_number < 1)
                {
                    // 0 is invalid
                    cc_data[j*3]=0x00; // Set to invalid
                    cc_data[j*3+1]=0x00;
                    cc_data[j*3+2]=0x00;
                }
                else
                {
                    // Treat field_number 3 as 1
                    field_number = (field_number - 1) & 0x01;
                    // top_field_first also affects to which field the caption
                    // belongs.
                    if(!ctx->top_field_first)
                        field_number ^= 0x01;
                    cc_data[j*3]=0x04|(field_number);
                    cc_data[j*3+1]=reverse8(cc_data1);
                    cc_data[j*3+2]=reverse8(cc_data2);
                }
            }
            cc_data[cc_count*3]=0xFF;
            store_hdcc(ctx, cc_data, cc_count, ctx->timing->current_tref, ctx->timing->fts_now, sub);

            dbg_print(CCX_DMT_VERBOSE, "Reading SCTE 20 CC blocks - done\n");
        }
        // reserved - unspecified
    }
    // ReplayTV 4000/5000 caption header - parsing information
    // derived from CCExtract.bdl
    else if ( (ud_header[0] == 0xbb     //ReplayTV 4000
               || ud_header[0] == 0x99) //ReplayTV 5000
              && ud_header[1] == 0x02 )
    {
        unsigned char data[3];

        if (ud_header[0]==0xbb)
            ctx->stat_replay4000headers++;
        else
            ctx->stat_replay5000headers++;


        read_bytes(ustream, 2); // "BB 02" or "99 02"
        data[0]=0x05; // Field 2
        data[1]=read_u8(ustream);
        data[2]=read_u8(ustream);
        do_cb(ctx, data, sub);
        read_bytes(ustream, 2); // Skip "CC 02" for R4000 or "AA 02" for R5000
        data[0]=0x04; // Field 1
        data[1]=read_u8(ustream);
        data[2]=read_u8(ustream);
        do_cb(ctx, data, sub);
    }
    // HDTV - see A/53 Part 4 (Video)
    else if ( !memcmp(ud_header,"\x47\x41\x39\x34", 4 ) )
    {
        ctx->stat_hdtv++;

        read_bytes(ustream, 4); // "47 41 39 34"

        unsigned char type_code = read_u8(ustream);
        if (type_code==0x03) // CC data.
        {
            skip_bits(ustream,1); // reserved
            unsigned char process_cc_data = (unsigned char) read_bits(ustream,1);
            skip_bits(ustream,1); // additional_data - unused
            unsigned char cc_count = (unsigned char) read_bits(ustream,5);
            read_bytes(ustream, 1); // "FF"
            if (process_cc_data)
            {
                dbg_print(CCX_DMT_VERBOSE, "Reading %d HDTV CC blocks\n", cc_count);

                int proceed = 1;
                unsigned char *cc_data = read_bytes(ustream, cc_count*3);
                if (ustream->bitsleft < 0)
                    fatal(CCX_COMMON_EXIT_BUG_BUG, "Not enough for CC captions!");

                // Check for proper marker - This read makes sure that
                // cc_count*3+1 bytes are read and available in cc_data.
                if (read_u8(ustream)!=0xFF)
                    proceed=0;

                if (!proceed)
                {
                    dbg_print(CCX_DMT_VERBOSE, "\rThe following payload is not properly terminated.\n");
                    dump (CCX_DMT_VERBOSE, cc_data, cc_count*3+1, 0, 0);
                }
                dbg_print(CCX_DMT_VERBOSE, "Reading %d HD CC blocks\n", cc_count);

                // B-frames might be (temporal) before or after the anchor
                // frame they belong to. Store the buffer until the next anchor
                // frame occurs.  The buffer will be flushed (sorted) in the
                // picture header (or GOP) section when the next anchor occurs.
                // Please note we store the current value of the global
                // fts_now variable (and not get_fts()) as we are going to
                // re-create the timeline in process_hdcc() (Slightly ugly).
                store_hdcc(ctx, cc_data, cc_count, ctx->timing->current_tref, ctx->timing->fts_now, sub);

                dbg_print(CCX_DMT_VERBOSE, "Reading HDTV blocks - done\n");
            }
        }
        // reserved - additional_cc_data
    }
    // DVB closed caption header for Dish Network (Field 1 only) */
    else if ( !memcmp(ud_header,"\x05\x02", 2 ) )
    {
        // Like HDTV (above) Dish Network captions can be stored at each
        // frame, but maximal two caption blocks per frame and only one
        // field is stored.
        // To process this with the HDTV framework we create a "HDTV" caption
        // format compatible array. Two times 3 bytes plus one for the 0xFF
        // marker at the end. Pre-init to field 1 and set the 0xFF marker.
        static unsigned char dishdata[7] = {0x04, 0, 0, 0x04, 0, 0, 0xFF};
        int cc_count;

        dbg_print(CCX_DMT_VERBOSE, "Reading Dish Network user data\n");

        ctx->stat_dishheaders++;

        read_bytes(ustream, 2); // "05 02"

        // The next bytes are like this:
        // header[2] : ID: 0x04 (MPEG?), 0x03 (H264?)
        // header[3-4]: Two byte counter (counting (sub-)GOPs?)
        // header[5-6]: Two bytes, maybe checksum?
        // header[7]: Pattern type
        //            on B-frame: 0x02, 0x04
        //            on I-/P-frame: 0x05
        unsigned char id = read_u8(ustream);
        unsigned dishcount = read_u16(ustream);
        unsigned something = read_u16(ustream);
        unsigned char type = read_u8(ustream);
        dbg_print(CCX_DMT_PARSE, "DN  ID: %02X  Count: %5u  Unknown: %04X  Pattern: %X",
                  id, dishcount, something, type);

        unsigned char hi;

        // The following block needs 4 to 6 bytes starting from the
        // current position
        unsigned char *dcd = ustream->pos; // dish caption data
        switch (type)
        {
        case 0x02:
            // Two byte caption - always on B-frame
            // The following 4 bytes are:
            // 0  :  0x09
            // 1-2: caption block
            // 3  : REPEAT - 02: two bytes
            //             - 04: four bytes (repeat first two)
            dbg_print(CCX_DMT_PARSE, "\n02 %02X  %02X:%02X - R:%02X :",
                      dcd[0], dcd[1], dcd[2], dcd[3]);

            cc_count = 1;
            dishdata[1]=dcd[1];
            dishdata[2]=dcd[2];

            dbg_print(CCX_DMT_PARSE, "%s", debug_608toASC( dishdata, 0) );

            type=dcd[3];  // repeater (0x02 or 0x04)
            hi = dishdata[1] & 0x7f; // Get only the 7 low bits
            if (type==0x04 && hi<32) // repeat (only for non-character pairs)
            {
                cc_count = 2;
                dishdata[3]=0x04; // Field 1
                dishdata[4]=dishdata[1];
                dishdata[5]=dishdata[2];

                dbg_print(CCX_DMT_PARSE, "%s:\n", debug_608toASC( dishdata+3, 0) );
            }
            else
            {
                dbg_print(CCX_DMT_PARSE, ":\n");
            }

            dishdata[cc_count*3] = 0xFF; // Set end marker

            store_hdcc(ctx, dishdata, cc_count, ctx->timing->current_tref, ctx->timing->fts_now, sub);

            // Ignore 3 (0x0A, followed by two unknown) bytes.
            break;
        case 0x04:
            // Four byte caption - always on B-frame
            // The following 5 bytes are:
            // 0  :  0x09
            // 1-2: caption block
            // 3-4: caption block
            dbg_print(CCX_DMT_PARSE, "\n04 %02X  %02X:%02X:%02X:%02X  :",
                      dcd[0], dcd[1], dcd[2], dcd[3], dcd[4]);

            cc_count = 2;
            dishdata[1]=dcd[1];
            dishdata[2]=dcd[2];

            dishdata[3]=0x04; // Field 1
            dishdata[4]=dcd[3];
            dishdata[5]=dcd[4];
            dishdata[6] = 0xFF; // Set end marker

            dbg_print(CCX_DMT_PARSE, "%s", debug_608toASC( dishdata, 0) );
            dbg_print(CCX_DMT_PARSE, "%s:\n", debug_608toASC( dishdata+3, 0) );

            store_hdcc(ctx, dishdata, cc_count, ctx->timing->current_tref, ctx->timing->fts_now, sub);

            // Ignore 4 (0x020A, followed by two unknown) bytes.
            break;
        case 0x05:
            // Buffered caption - always on I-/P-frame
            // The following six bytes are:
            // 0  :  0x04
            // - the following are from previous 0x05 caption header -
            // 1  : prev dcd[2]
            // 2-3: prev dcd[3-4]
            // 4-5: prev dcd[5-6]
            dbg_print(CCX_DMT_PARSE, " - %02X  pch: %02X %5u %02X:%02X\n",
                      dcd[0], dcd[1],
                      (unsigned)dcd[2]*256+dcd[3],
                      dcd[4], dcd[5]);
            dcd+=6; // Skip these 6 bytes

            // Now one of the "regular" 0x02 or 0x04 captions follows
            dbg_print(CCX_DMT_PARSE, "%02X %02X  %02X:%02X",
                      dcd[0], dcd[1], dcd[2], dcd[3]);

            type=dcd[0]; // Number of caption bytes (0x02 or 0x04)

            cc_count = 1;
            dishdata[1]=dcd[2];
            dishdata[2]=dcd[3];

            dcd+=4; // Skip the first 4 bytes.
            if (type==0x02)
            {
                type=dcd[0]; // repeater (0x02 or 0x04)
                dcd++; // Skip the repeater byte.

                dbg_print(CCX_DMT_PARSE, " - R:%02X :%s", type, debug_608toASC( dishdata, 0) );

                hi = dishdata[1] & 0x7f; // Get only the 7 low bits
                if (type==0x04 && hi<32)
                {
                    cc_count = 2;
                    dishdata[3]=0x04; // Field 1
                    dishdata[4]=dishdata[1];
                    dishdata[5]=dishdata[2];
                    dbg_print(CCX_DMT_PARSE, "%s:\n", debug_608toASC( dishdata+3, 0) );
                }
                else
                {
                    dbg_print(CCX_DMT_PARSE, ":\n");
                }
                dishdata[cc_count*3] = 0xFF; // Set end marker
            }
            else
            {
                dbg_print(CCX_DMT_PARSE, ":%02X:%02X  ",
                          dcd[0], dcd[1]);
                cc_count = 2;
                dishdata[3]=0x04; // Field 1
                dishdata[4]=dcd[0];
                dishdata[5]=dcd[1];
                dishdata[6] = 0xFF; // Set end marker

                dbg_print(CCX_DMT_PARSE, ":%s", debug_608toASC( dishdata, 0) );
                dbg_print(CCX_DMT_PARSE, "%s:\n", debug_608toASC( dishdata+3, 0) );
            }

            store_hdcc(ctx, dishdata, cc_count, ctx->timing->current_tref, ctx->timing->fts_now, sub);

            // Ignore 3 (0x0A, followed by 2 unknown) bytes.
            break;
        default:
            // printf ("Unknown?\n");
            break;
        } // switch

        dbg_print(CCX_DMT_VERBOSE, "Reading Dish Network user data - done\n");
    }
    // CEA 608 / aka "Divicom standard", see:
    // http://www.pixeltools.com/tech_tip_closed_captioning.html
    else if ( !memcmp(ud_header,"\x02\x09", 2 ) )
    {
        // Either a documentation or more examples are needed.
        ctx->stat_divicom++;

        unsigned char data[3];

        read_bytes(ustream, 2); // "02 09"
        read_bytes(ustream, 2); // "80 80" ???
        read_bytes(ustream, 2); // "02 0A" ???
        data[0]=0x04; // Field 1
        data[1]=read_u8(ustream);
        data[2]=read_u8(ustream);
        do_cb(ctx, data, sub);
        // This is probably incomplete!
    }
    // GXF vbi OEM code
    else if ( !memcmp(ud_header,"\x73\x52\x21\x06", 4 ) )
    {
        int udatalen = ustream->end - ustream->pos;
        uint16_t line_nb;
        uint8_t line_type;
        uint8_t field = 1;
        read_bytes(ustream, 4); //skip header code
        read_bytes(ustream, 2); //skip data length
        line_nb = read_bits(ustream, 16);
        line_type = read_u8(ustream);
        field = (line_type & 0x03);
        if(field == 0)
            mprint("MPEG:VBI: Invalid field\n");

        line_type = line_type >> 2;
        if(line_type != 1)
            mprint("MPEG:VBI: only support Luma line\n");

        if (udatalen < 720)
            mprint("MPEG:VBI: Minimum 720 bytes in luma line required\n");

        decode_vbi(ctx, field, ustream->pos, 720, sub);
        dbg_print(CCX_DMT_VERBOSE, "GXF (vbi line %d) user data:\n", line_nb);
    }
コード例 #2
0
int do_cb (struct lib_cc_decode *ctx, unsigned char *cc_block, struct cc_subtitle *sub)
{
	unsigned char cc_valid = (*cc_block & 4) >>2;
	unsigned char cc_type = *cc_block & 3;

	int timeok = 1;

	if ( ctx->fix_padding
		&& cc_valid==0 && cc_type <= 1 // Only fix NTSC packets
		&& cc_block[1]==0 && cc_block[2]==0 )
	{
		/* Padding */
		cc_valid=1;
		cc_block[1]=0x80;
		cc_block[2]=0x80;
	}

	if ( ctx->write_format!=CCX_OF_RAW && // In raw we cannot skip padding because timing depends on it
		 ctx->write_format!=CCX_OF_DVDRAW &&
		(cc_block[0]==0xFA || cc_block[0]==0xFC || cc_block[0]==0xFD )
		&& (cc_block[1]&0x7F)==0 && (cc_block[2]&0x7F)==0) // CFS: Skip non-data, makes debugging harder.
		return 1;

	// Print raw data with FTS.
	dbg_print(CCX_DMT_CBRAW, "%s   %d   %02X:%c%c:%02X", print_mstime(ctx->timing->fts_now + ctx->timing->fts_global),in_xds_mode,
			cc_block[0], cc_block[1]&0x7f,cc_block[2]&0x7f, cc_block[2]);

	/* In theory the writercwtdata() function could return early and not
	 * go through the 608/708 cases below.  We do that to get accurate
	 * counts for cb_field1, cb_field2 and cb_708.
	 * Note that printdata() and dtvcc_process_data() must not be called for
	 * the CCX_OF_RCWT case. */

	if (cc_valid || cc_type==3)
	{
		ctx->cc_stats[cc_type]++;

		switch (cc_type)
		{
			case 0:
				dbg_print(CCX_DMT_CBRAW, "    %s   ..   ..\n",  debug_608toASC( cc_block, 0));

				ctx->current_field = 1;
				ctx->saw_caption_block = 1;

				if (ctx->extraction_start.set &&
						get_fts(ctx->timing, ctx->current_field) < ctx->extraction_start.time_in_ms)
					timeok = 0;
				if (ctx->extraction_end.set &&
						get_fts(ctx->timing, ctx->current_field) > ctx->extraction_end.time_in_ms)
				{
					timeok = 0;
					ctx->processed_enough=1;
				}
				if (timeok)
				{
					if(ctx->write_format!=CCX_OF_RCWT)
						printdata (ctx, cc_block+1,2,0,0, sub);
					else
						writercwtdata(ctx, cc_block, sub);
				}
				cb_field1++;
				break;
			case 1:
				dbg_print(CCX_DMT_CBRAW, "    ..   %s   ..\n",  debug_608toASC( cc_block, 1));

				ctx->current_field = 2;
				ctx->saw_caption_block = 1;

				if (ctx->extraction_start.set &&
						get_fts(ctx->timing, ctx->current_field) < ctx->extraction_start.time_in_ms)
					timeok = 0;
				if (ctx->extraction_end.set &&
						get_fts(ctx->timing, ctx->current_field) > ctx->extraction_end.time_in_ms)
				{
					timeok = 0;
					ctx->processed_enough=1;
				}
				if (timeok)
				{
					if(ctx->write_format!=CCX_OF_RCWT)
						printdata (ctx, 0,0,cc_block+1,2, sub);
					else
						writercwtdata(ctx, cc_block, sub);
				}
				cb_field2++;
				break;
			case 2: //EIA-708
				// DTVCC packet data
				// Fall through
			case 3: //EIA-708
				dbg_print(CCX_DMT_CBRAW, "    ..   ..   DD\n");

				// DTVCC packet start
				ctx->current_field = 3;

				if (ctx->extraction_start.set &&
						get_fts(ctx->timing, ctx->current_field) < ctx->extraction_start.time_in_ms)
					timeok = 0;
				if (ctx->extraction_end.set &&
						get_fts(ctx->timing, ctx->current_field) > ctx->extraction_end.time_in_ms)
				{
					timeok = 0;
					ctx->processed_enough=1;
				}
				char temp[4];
				temp[0]=cc_valid;
				temp[1]=cc_type;
				temp[2]=cc_block[1];
				temp[3]=cc_block[2];
				if (timeok)
				{
					if (ctx->write_format != CCX_OF_RCWT)
						ccx_dtvcc_process_data(ctx, (const unsigned char *) temp, 4);
					else
						writercwtdata(ctx, cc_block, sub);
				}
				cb_708++;
				// Check for bytes read
				// printf ("Warning: Losing EIA-708 data!\n");
				break;
			default:
				fatal(CCX_COMMON_EXIT_BUG_BUG, "Cannot be reached!");
		} // switch (cc_type)
	} // cc_valid
	else
	{
		dbg_print(CCX_DMT_CBRAW, "    ..   ..   ..\n");
		dbg_print(CCX_DMT_VERBOSE, "Found !(cc_valid || cc_type==3) - ignore this block\n");
	}

	return 1;
}
コード例 #3
0
ファイル: sequencing.cpp プロジェクト: MrMdR/julapy
int do_cb (unsigned char *cc_block)
{
    unsigned char cc_valid = (*cc_block & 4) >>2;
    unsigned char cc_type = *cc_block & 3;

    int timeok = 1;

    if ( fix_padding
         && cc_valid==0 && cc_type <= 1 // Only fix NTSC packets
         && cc_block[1]==0 && cc_block[2]==0 )
    {
        /* Padding */
        cc_valid=1;
        cc_block[1]=0x80;
        cc_block[2]=0x80;
    }

    // Print raw data with FTS.
    if (debug_cbraw)
        printf("%s  %02X:%02X:%02X", print_mstime(fts_now + fts_global),
               cc_block[0], cc_block[1], cc_block[2]);

    /* In theory the writercwtdata() function could return early and not
     * go through the 608/708 cases below.  We do that to get accurate
     * counts for cb_field1, cb_field2 and cb_708.
     * Note that printdata() and do_708() must not be called for
     * the OF_RCWT case. */

    if (cc_valid || cc_type==3)
    {
        cc_stats[cc_type]++;

        switch (cc_type)
        {
        case 0:
            if (debug_cbraw)
                printf("    %s   ..   ..\n",  debug_608toASC( cc_block, 0));

            current_field=1;
            saw_caption_block = 1;

            if (extraction_start.set && get_fts() < extraction_start.time_in_ms)
                timeok = 0;
            if (extraction_end.set && get_fts() > extraction_end.time_in_ms)
            {
                timeok = 0;
                processed_enough=1;
            }
            if (timeok)
            {
                if(write_format!=OF_RCWT)
                    printdata (cc_block+1,2,0,0);
                else
                    writercwtdata(cc_block);
            }
            cb_field1++;
            break;
        case 1:
            if (debug_cbraw)
                printf("    ..   %s   ..\n",  debug_608toASC( cc_block, 1));

            current_field=2;
            saw_caption_block = 1;

            if (extraction_start.set && get_fts() < extraction_start.time_in_ms)
                timeok = 0;
            if (extraction_end.set && get_fts() > extraction_end.time_in_ms)
            {
                timeok = 0;
                processed_enough=1;
            }
            if (timeok)
            {
                if(write_format!=OF_RCWT)
                    printdata (0,0,cc_block+1,2);
                else
                    writercwtdata(cc_block);
            }
            cb_field2++;
            break;
        case 2: //EIA-708
            // DTVCC packet data
            // Fall through
        case 3: //EIA-708
            if (debug_cbraw)
                printf("    ..   ..   DD\n");

            // DTVCC packet start
            current_field=3;

            if (extraction_start.set && get_fts() < extraction_start.time_in_ms)
                timeok = 0;
            if (extraction_end.set && get_fts() > extraction_end.time_in_ms)
            {
                timeok = 0;
                processed_enough=1;
            }
            char temp[4];
            temp[0]=cc_valid;
            temp[1]=cc_type;
            temp[2]=cc_block[1];
            temp[3]=cc_block[2];
            if (timeok)
            {
                if(write_format!=OF_RCWT)
                   do_708 ((const unsigned char *) temp, 4);
                else
                    writercwtdata(cc_block);
            }
            cb_708++;
            // Check for bytes read
            // printf ("Warning: Losing EIA-708 data!\n");
            break;
        default:
            fatal(EXIT_BUG_BUG, "Cannot be reached!");
        } // switch (cc_type)
    } // cc_valid
    else
    {
        if (debug_cbraw)
            printf("    ..   ..   ..\n");
        if (debug_verbose)
            printf("Found !(cc_valid || cc_type==3) - ignore this block\n");
    }

    return 1;
}