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Revision 195 - (download) (annotate)
Wed Jun 12 20:38:41 2002 UTC (17 years, 4 months ago) by edgomez
File size: 22050 byte(s)
Cosmetic - CodingStyle Applied - Legal Headers will be added later
 /******************************************************************************
  *                                                                            *
  *  This file is part of XviD, a free MPEG-4 video encoder/decoder            *
  *                                                                            *
  *  XviD is an implementation of a part of one or more MPEG-4 Video tools     *
  *  as specified in ISO/IEC 14496-2 standard.  Those intending to use this    *
  *  software module in hardware or software products are advised that its     *
  *  use may infringe existing patents or copyrights, and any such use         *
  *  would be at such party's own risk.  The original developer of this        *
  *  software module and his/her company, and subsequent editors and their     *
  *  companies, will have no liability for use of this software or             *
  *  modifications or derivatives thereof.                                     *
  *                                                                            *
  *  XviD 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.                                       *
  *                                                                            *
  *  XviD 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA  *
  *                                                                            *
  ******************************************************************************/

 /******************************************************************************
  *                                                                            *
  *  bitstream.c                                                               *
  *                                                                            *
  *  Copyright (C) 2001 - Peter Ross <pross@cs.rmit.edu.au>                    *
  *                                                                            *
  *  For more information visit the XviD homepage: http://www.xvid.org         *
  *                                                                            *
  ******************************************************************************/

 /******************************************************************************
  *																			   *	
  *  Revision history:                                                         *
  *																			   *	
  *  08.05.2002  add low_delay support for B_VOP decode						   *
  *              MinChen <chenm001@163.com>                                    *
  *  06.05.2002 low_delay                                                      *
  *  06.05.2002 fixed fincr/fbase error                                        *
  *  01.05.2002 added BVOP support to BitstreamWriteVopHeader                  *
  *  15.04.2002 rewrite log2bin use asm386  By MinChen <chenm001@163.com>      *
  *  26.03.2002 interlacing support											   *
  *  03.03.2002 qmatrix writing												   *
  *  03.03.2002 merged BITREADER and BITWRITER								   *
  *	 30.02.2002	intra_dc_threshold support									   *
  *	 04.12.2001	support for additional headers								   *
  *	 16.12.2001	inital version                                           	   *
  *																			   *
  ******************************************************************************/


#include "bitstream.h"
#include "zigzag.h"
#include "../quant/quant_matrix.h"


static uint32_t __inline
log2bin(uint32_t value)
{
/* Changed by Chenm001 */
#ifndef WIN32
	int n = 0;

	while (value) {
		value >>= 1;
		n++;
	}
	return n;
#else
	__asm {
	bsr eax, value inc eax}
#endif
}


static const uint32_t intra_dc_threshold_table[] = {
	32,							/* never use */
	13,
	15,
	17,
	19,
	21,
	23,
	1,
};


void
bs_get_matrix(Bitstream * bs,
			  uint8_t * matrix)
{
	int i = 0;
	int last, value = 0;

	do {
		last = value;
		value = BitstreamGetBits(bs, 8);
		matrix[scan_tables[0][i++]] = value;
	}
	while (value != 0 && i < 64);

	while (i < 64) {
		matrix[scan_tables[0][i++]] = last;
	}
}

/*
decode headers
returns coding_type, or -1 if error
*/

int
BitstreamReadHeaders(Bitstream * bs,
					 DECODER * dec,
					 uint32_t * rounding,
					 uint32_t * quant,
					 uint32_t * fcode_forward,
					 uint32_t * fcode_backward,
					 uint32_t * intra_dc_threshold)
{
	uint32_t vol_ver_id;
	static uint32_t time_increment_resolution;
	uint32_t coding_type;
	uint32_t start_code;
	uint32_t time_incr = 0;
	int32_t time_increment;

	do {
		BitstreamByteAlign(bs);
		start_code = BitstreamShowBits(bs, 32);

		if (start_code == VISOBJSEQ_START_CODE) {
			// DEBUG("visual_object_sequence");
			BitstreamSkip(bs, 32);	// visual_object_sequence_start_code
			BitstreamSkip(bs, 8);	// profile_and_level_indication
		} else if (start_code == VISOBJSEQ_STOP_CODE) {
			BitstreamSkip(bs, 32);	// visual_object_sequence_stop_code
		} else if (start_code == VISOBJ_START_CODE) {
			// DEBUG("visual_object");
			BitstreamSkip(bs, 32);	// visual_object_start_code
			if (BitstreamGetBit(bs))	// is_visual_object_identified
			{
				vol_ver_id = BitstreamGetBits(bs, 4);	// visual_object_ver_id
				BitstreamSkip(bs, 3);	// visual_object_priority
			} else {
				vol_ver_id = 1;
			}

			if (BitstreamShowBits(bs, 4) != VISOBJ_TYPE_VIDEO)	// visual_object_type
			{
				DEBUG("visual_object_type != video");
				return -1;
			}
			BitstreamSkip(bs, 4);

			// video_signal_type

			if (BitstreamGetBit(bs))	// video_signal_type
			{
				DEBUG("+ video_signal_type");
				BitstreamSkip(bs, 3);	// video_format
				BitstreamSkip(bs, 1);	// video_range
				if (BitstreamGetBit(bs))	// color_description
				{
					DEBUG("+ color_description");
					BitstreamSkip(bs, 8);	// color_primaries
					BitstreamSkip(bs, 8);	// transfer_characteristics
					BitstreamSkip(bs, 8);	// matrix_coefficients
				}
			}
		} else if ((start_code & ~0x1f) == VIDOBJ_START_CODE) {
			BitstreamSkip(bs, 32);	// video_object_start_code
		} else if ((start_code & ~0xf) == VIDOBJLAY_START_CODE) {
			// DEBUG("video_object_layer");
			BitstreamSkip(bs, 32);	// video_object_layer_start_code

			BitstreamSkip(bs, 1);	// random_accessible_vol

			// video_object_type_indication
			if (BitstreamShowBits(bs, 8) != VIDOBJLAY_TYPE_SIMPLE && BitstreamShowBits(bs, 8) != VIDOBJLAY_TYPE_CORE && BitstreamShowBits(bs, 8) != VIDOBJLAY_TYPE_MAIN && BitstreamShowBits(bs, 8) != 0)	// BUGGY DIVX
			{
				DEBUG1("video_object_type_indication not supported",
					   BitstreamShowBits(bs, 8));
				return -1;
			}
			BitstreamSkip(bs, 8);


			if (BitstreamGetBit(bs))	// is_object_layer_identifier
			{
				DEBUG("+ is_object_layer_identifier");
				vol_ver_id = BitstreamGetBits(bs, 4);	// video_object_layer_verid
				BitstreamSkip(bs, 3);	// video_object_layer_priority
			} else {
				vol_ver_id = 1;
			}
			//DEBUGI("vol_ver_id", vol_ver_id);

			if (BitstreamGetBits(bs, 4) == VIDOBJLAY_AR_EXTPAR)	// aspect_ratio_info
			{
				DEBUG("+ aspect_ratio_info");
				BitstreamSkip(bs, 8);	// par_width
				BitstreamSkip(bs, 8);	// par_height
			}

			if (BitstreamGetBit(bs))	// vol_control_parameters
			{
				DEBUG("+ vol_control_parameters");
				BitstreamSkip(bs, 2);	// chroma_format
				dec->low_delay = BitstreamGetBit(bs);	// low_delay
				if (BitstreamGetBit(bs))	// vbv_parameters
				{
					DEBUG("+ vbv_parameters");
					BitstreamSkip(bs, 15);	// first_half_bitrate
					READ_MARKER();
					BitstreamSkip(bs, 15);	// latter_half_bitrate
					READ_MARKER();
					BitstreamSkip(bs, 15);	// first_half_vbv_buffer_size
					READ_MARKER();
					BitstreamSkip(bs, 3);	// latter_half_vbv_buffer_size
					BitstreamSkip(bs, 11);	// first_half_vbv_occupancy
					READ_MARKER();
					BitstreamSkip(bs, 15);	// latter_half_vbv_occupancy
					READ_MARKER();

				}
			}

			dec->shape = BitstreamGetBits(bs, 2);	// video_object_layer_shape
			// DEBUG1("shape", dec->shape);

			if (dec->shape == VIDOBJLAY_SHAPE_GRAYSCALE && vol_ver_id != 1) {
				BitstreamSkip(bs, 4);	// video_object_layer_shape_extension
			}

			READ_MARKER();

// *************************** for decode B-frame time ***********************
			time_increment_resolution = BitstreamGetBits(bs, 16);	// vop_time_increment_resolution
			time_increment_resolution--;
			//DEBUG1("time_increment_resolution=",time_increment_resolution);
			if (time_increment_resolution > 0) {
				dec->time_inc_bits = log2bin(time_increment_resolution);
			} else {
				// dec->time_inc_bits = 0;

				// for "old" xvid compatibility, set time_inc_bits = 1
				dec->time_inc_bits = 1;
			}

			READ_MARKER();

			if (BitstreamGetBit(bs))	// fixed_vop_rate
			{
				BitstreamSkip(bs, dec->time_inc_bits);	// fixed_vop_time_increment
			}

			if (dec->shape != VIDOBJLAY_SHAPE_BINARY_ONLY) {

				if (dec->shape == VIDOBJLAY_SHAPE_RECTANGULAR) {
					uint32_t width, height;

					READ_MARKER();
					width = BitstreamGetBits(bs, 13);	// video_object_layer_width
					//DEBUGI("width", width);
					READ_MARKER();
					height = BitstreamGetBits(bs, 13);	// video_object_layer_height
					//DEBUGI("height", height); 
					READ_MARKER();

					if (width != dec->width || height != dec->height) {
						DEBUG("FATAL: video dimension discrepancy ***");
						DEBUG2("bitstream width/height", width, height);
						DEBUG2("param width/height", dec->width, dec->height);
						return -1;
					}

				}

				if ((dec->interlacing = BitstreamGetBit(bs))) {
					DEBUG("vol: interlacing");
				}

				if (!BitstreamGetBit(bs))	// obmc_disable
				{
					DEBUG("IGNORED/TODO: !obmc_disable");
					// TODO
					// fucking divx4.02 has this enabled
				}

				if (BitstreamGetBits(bs, (vol_ver_id == 1 ? 1 : 2)))	// sprite_enable
				{
					DEBUG("sprite_enable; not supported");
					return -1;
				}

				if (vol_ver_id != 1 &&
					dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR) {
					BitstreamSkip(bs, 1);	// sadct_disable
				}

				if (BitstreamGetBit(bs))	// not_8_bit
				{
					DEBUG("+ not_8_bit [IGNORED/TODO]");
					dec->quant_bits = BitstreamGetBits(bs, 4);	// quant_precision
					BitstreamSkip(bs, 4);	// bits_per_pixel
				} else {
					dec->quant_bits = 5;
				}

				if (dec->shape == VIDOBJLAY_SHAPE_GRAYSCALE) {
					BitstreamSkip(bs, 1);	// no_gray_quant_update
					BitstreamSkip(bs, 1);	// composition_method
					BitstreamSkip(bs, 1);	// linear_composition
				}

				dec->quant_type = BitstreamGetBit(bs);	// quant_type
				// DEBUG1("**** quant_type", dec->quant_type);

				if (dec->quant_type) {
					if (BitstreamGetBit(bs))	// load_intra_quant_mat
					{
						uint8_t matrix[64];

						bs_get_matrix(bs, matrix);
						set_intra_matrix(matrix);
					} else
						set_intra_matrix(get_default_intra_matrix());

					if (BitstreamGetBit(bs))	// load_inter_quant_mat
					{
						uint8_t matrix[64];

						bs_get_matrix(bs, matrix);
						set_inter_matrix(matrix);
					} else
						set_inter_matrix(get_default_inter_matrix());

					if (dec->shape == VIDOBJLAY_SHAPE_GRAYSCALE) {
						// TODO
						DEBUG("TODO: grayscale matrix stuff");
						return -1;
					}

				}


				if (vol_ver_id != 1) {
					dec->quarterpel = BitstreamGetBit(bs);	// quarter_sampe
					if (dec->quarterpel) {
						DEBUG("IGNORED/TODO: quarter_sample");
					}
				} else {
					dec->quarterpel = 0;
				}

				if (!BitstreamGetBit(bs))	// complexity_estimation_disable
				{
					DEBUG("TODO: complexity_estimation header");
					// TODO
					return -1;
				}

				if (!BitstreamGetBit(bs))	// resync_marker_disable
				{
					DEBUG("IGNORED/TODO: !resync_marker_disable");
					// TODO
				}

				if (BitstreamGetBit(bs))	// data_partitioned
				{
					DEBUG("+ data_partitioned");
					BitstreamSkip(bs, 1);	// reversible_vlc
				}

				if (vol_ver_id != 1) {
					if (BitstreamGetBit(bs))	// newpred_enable
					{
						DEBUG("+ newpred_enable");
						BitstreamSkip(bs, 2);	// requested_upstream_message_type
						BitstreamSkip(bs, 1);	// newpred_segment_type
					}
					if (BitstreamGetBit(bs))	// reduced_resolution_vop_enable
					{
						DEBUG("TODO: reduced_resolution_vop_enable");
						// TODO
						return -1;
					}
				}

				if ((dec->scalability = BitstreamGetBit(bs)))	// scalability
				{
					// TODO
					DEBUG("TODO: scalability");
					return -1;
				}
			} else				// dec->shape == BINARY_ONLY
			{
				if (vol_ver_id != 1) {
					if (BitstreamGetBit(bs))	// scalability
					{
						// TODO
						DEBUG("TODO: scalability");
						return -1;
					}
				}
				BitstreamSkip(bs, 1);	// resync_marker_disable

			}

		} else if (start_code == GRPOFVOP_START_CODE) {
			// DEBUG("group_of_vop");
			BitstreamSkip(bs, 32);
			{
				int hours, minutes, seconds;

				hours = BitstreamGetBits(bs, 5);
				minutes = BitstreamGetBits(bs, 6);
				READ_MARKER();
				seconds = BitstreamGetBits(bs, 6);
				// DEBUG3("hms", hours, minutes, seconds);
			}
			BitstreamSkip(bs, 1);	// closed_gov
			BitstreamSkip(bs, 1);	// broken_link
		} else if (start_code == VOP_START_CODE) {
			// DEBUG("vop_start_code");
			BitstreamSkip(bs, 32);	// vop_start_code

			coding_type = BitstreamGetBits(bs, 2);	// vop_coding_type
			//DEBUG1("coding_type", coding_type);

// *************************** for decode B-frame time ***********************
			while (BitstreamGetBit(bs) != 0)	// time_base
				time_incr++;

			READ_MARKER();

			//DEBUG1("time_inc_bits", dec->time_inc_bits);
			//DEBUG1("vop_time_incr", BitstreamShowBits(bs, dec->time_inc_bits));
			if (dec->time_inc_bits) {
				//BitstreamSkip(bs, dec->time_inc_bits);    // vop_time_increment
				time_increment = (BitstreamGetBits(bs, dec->time_inc_bits));	// vop_time_increment
			}
			if (coding_type != B_VOP) {
				dec->last_time_base = dec->time_base;
				dec->time_base += time_incr;
				dec->time =
					dec->time_base * time_increment_resolution +
					time_increment;
				dec->time_pp = (uint32_t) (dec->time - dec->last_non_b_time);
				dec->last_non_b_time = dec->time;
			} else {
				dec->time =
					(dec->last_time_base +
					 time_incr) * time_increment_resolution + time_increment;
				dec->time_bp = (uint32_t) (dec->last_non_b_time - dec->time);
			}
			//DEBUG1("time_increment=",time_increment);

			READ_MARKER();

			if (!BitstreamGetBit(bs))	// vop_coded
			{
				return N_VOP;
			}

			/* if (newpred_enable)
			   {
			   }
			 */

			// fix a little bug by MinChen <chenm002@163.com>
			if ((dec->shape != VIDOBJLAY_SHAPE_BINARY_ONLY) &&
				(coding_type == P_VOP)) {
				*rounding = BitstreamGetBit(bs);	// rounding_type
				//DEBUG1("rounding", *rounding);
			}

			/* if (reduced_resolution_enable)
			   {
			   }
			 */

			if (dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR) {
				uint32_t width, height;
				uint32_t horiz_mc_ref, vert_mc_ref;

				width = BitstreamGetBits(bs, 13);
				READ_MARKER();
				height = BitstreamGetBits(bs, 13);
				READ_MARKER();
				horiz_mc_ref = BitstreamGetBits(bs, 13);
				READ_MARKER();
				vert_mc_ref = BitstreamGetBits(bs, 13);
				READ_MARKER();

				// DEBUG2("vop_width/height", width, height);
				// DEBUG2("ref             ", horiz_mc_ref, vert_mc_ref);

				BitstreamSkip(bs, 1);	// change_conv_ratio_disable
				if (BitstreamGetBit(bs))	// vop_constant_alpha
				{
					BitstreamSkip(bs, 8);	// vop_constant_alpha_value
				}
			}


			if (dec->shape != VIDOBJLAY_SHAPE_BINARY_ONLY) {
				// intra_dc_vlc_threshold
				*intra_dc_threshold =
					intra_dc_threshold_table[BitstreamGetBits(bs, 3)];

				if (dec->interlacing) {
					if ((dec->top_field_first = BitstreamGetBit(bs))) {
						DEBUG("vop: top_field_first");
					}
					if ((dec->alternate_vertical_scan = BitstreamGetBit(bs))) {
						DEBUG("vop: alternate_vertical_scan");
					}
				}
			}

			if ((*quant = BitstreamGetBits(bs, dec->quant_bits)) < 1)	// vop_quant
				*quant = 1;

			//DEBUG1("quant", *quant);

			if (coding_type != I_VOP) {
				*fcode_forward = BitstreamGetBits(bs, 3);	// fcode_forward
			}

			if (coding_type == B_VOP) {
				*fcode_backward = BitstreamGetBits(bs, 3);	// fcode_backward
			}
			if (!dec->scalability) {
				if ((dec->shape != VIDOBJLAY_SHAPE_RECTANGULAR) &&
					(coding_type != I_VOP)) {
					BitstreamSkip(bs, 1);	// vop_shape_coding_type
				}
			}
			return coding_type;
		} else if (start_code == USERDATA_START_CODE) {
			// DEBUG("user_data");
			BitstreamSkip(bs, 32);	// user_data_start_code
		} else					// start_code == ?
		{
			if (BitstreamShowBits(bs, 24) == 0x000001) {
				DEBUG1("*** WARNING: unknown start_code",
					   BitstreamShowBits(bs, 32));
			}
			BitstreamSkip(bs, 8);
		}
	}
	while ((BitstreamPos(bs) >> 3) < bs->length);

	DEBUG("*** WARNING: no vop_start_code found");
	return -1;					/* ignore it */
}


/* write custom quant matrix */

static void
bs_put_matrix(Bitstream * bs,
			  const int16_t * matrix)
{
	int i, j;
	const int last = matrix[scan_tables[0][63]];

	for (j = 63; j >= 0 && matrix[scan_tables[0][j - 1]] == last; j--);

	for (i = 0; i <= j; i++) {
		BitstreamPutBits(bs, matrix[scan_tables[0][i]], 8);
	}

	if (j < 63) {
		BitstreamPutBits(bs, 0, 8);
	}
}


/*
	write vol header
*/
void
BitstreamWriteVolHeader(Bitstream * const bs,
						const MBParam * pParam,
						const FRAMEINFO * frame)
{
	// video object_start_code & vo_id
	BitstreamPad(bs);
	BitstreamPutBits(bs, VO_START_CODE, 27);
	BitstreamPutBits(bs, 0, 5);

	// video_object_layer_start_code & vol_id
	BitstreamPutBits(bs, VOL_START_CODE, 28);
	BitstreamPutBits(bs, 0, 4);

	BitstreamPutBit(bs, 0);		// random_accessible_vol
	BitstreamPutBits(bs, 0, 8);	// video_object_type_indication
	BitstreamPutBit(bs, 0);		// is_object_layer_identified (0=not given)
	BitstreamPutBits(bs, 1, 4);	// aspect_ratio_info (1=1:1)

#ifdef BFRAMES
	if (pParam->max_bframes > 0) {
		dprintf("low_delay=1");
		BitstreamPutBit(bs, 1);	// vol_control_parameters
		BitstreamPutBits(bs, 1, 2);	// chroma_format 1="4:2:0"
		BitstreamPutBit(bs, 0);	// low_delay
		BitstreamPutBit(bs, 0);	// vbv_parameters (0=not given)
	} else
#endif
	{
		BitstreamPutBits(bs, 0, 1);	// vol_control_parameters (0=not given)
	}


	BitstreamPutBits(bs, 0, 2);	// video_object_layer_shape (0=rectangular)

	WRITE_MARKER();

	/* time_increment_resolution; ignored by current decore versions
	   eg. 2fps     res=2       inc=1
	   25fps        res=25      inc=1
	   29.97fps res=30000   inc=1001
	 */
#ifdef BFRAMES
	BitstreamPutBits(bs, pParam->fbase, 16);
#else
	BitstreamPutBits(bs, 2, 16);
#endif

	WRITE_MARKER();

	// fixed_vop_rate
	BitstreamPutBit(bs, 0);

	// fixed_time_increment: value=nth_of_sec, nbits = log2(resolution)
	// BitstreamPutBits(bs, 0, 15);

	WRITE_MARKER();
	BitstreamPutBits(bs, pParam->width, 13);	// width
	WRITE_MARKER();
	BitstreamPutBits(bs, pParam->height, 13);	// height
	WRITE_MARKER();

	BitstreamPutBit(bs, frame->global_flags & XVID_INTERLACING);	// interlace
	BitstreamPutBit(bs, 1);		// obmc_disable (overlapped block motion compensation)
	BitstreamPutBit(bs, 0);		// sprite_enable
	BitstreamPutBit(bs, 0);		// not_in_bit

	// quant_type   0=h.263  1=mpeg4(quantizer tables)
	BitstreamPutBit(bs, pParam->m_quant_type);

	if (pParam->m_quant_type) {
		BitstreamPutBit(bs, get_intra_matrix_status());	// load_intra_quant_mat
		if (get_intra_matrix_status()) {
			bs_put_matrix(bs, get_intra_matrix());
		}

		BitstreamPutBit(bs, get_inter_matrix_status());	// load_inter_quant_mat
		if (get_inter_matrix_status()) {
			bs_put_matrix(bs, get_inter_matrix());
		}

	}

	BitstreamPutBit(bs, 1);		// complexity_estimation_disable
	BitstreamPutBit(bs, 1);		// resync_marker_disable
	BitstreamPutBit(bs, 0);		// data_partitioned
	BitstreamPutBit(bs, 0);		// scalability
}


/*
  write vop header

  NOTE: doesnt handle bother with time_base & time_inc
  time_base = n seconds since last resync (eg. last iframe)
  time_inc = nth of a second since last resync
  (decoder uses these values to determine precise time since last resync)
*/
void
BitstreamWriteVopHeader(Bitstream * const bs,
						const MBParam * pParam,
						const FRAMEINFO * frame)
{
#ifdef BFRAMES
	uint32_t i;
#endif
	BitstreamPad(bs);
	BitstreamPutBits(bs, VOP_START_CODE, 32);

	BitstreamPutBits(bs, frame->coding_type, 2);

	// time_base = 0  write n x PutBit(1), PutBit(0)
#ifdef BFRAMES
	for (i = 0; i < frame->seconds; i++) {
		BitstreamPutBit(bs, 1);
	}
	BitstreamPutBit(bs, 0);
#else
	BitstreamPutBits(bs, 0, 1);
#endif

	WRITE_MARKER();

	// time_increment: value=nth_of_sec, nbits = log2(resolution)
#ifdef BFRAMES
	BitstreamPutBits(bs, frame->ticks, log2bin(pParam->fbase));
	dprintf("[%i:%i] %c\n", frame->seconds, frame->ticks,
			frame->coding_type == I_VOP ? 'I' : frame->coding_type ==
			P_VOP ? 'P' : 'B');
#else
	BitstreamPutBits(bs, 1, 1);
#endif

	WRITE_MARKER();

	BitstreamPutBits(bs, 1, 1);	// vop_coded

	if (frame->coding_type == P_VOP)
		BitstreamPutBits(bs, frame->rounding_type, 1);

	BitstreamPutBits(bs, 0, 3);	// intra_dc_vlc_threshold

	if (frame->global_flags & XVID_INTERLACING) {
		BitstreamPutBit(bs, 1);	// top field first
		BitstreamPutBit(bs, 0);	// alternate vertical scan
	}

	BitstreamPutBits(bs, frame->quant, 5);	// quantizer

	if (frame->coding_type != I_VOP)
		BitstreamPutBits(bs, frame->fcode, 3);	// forward_fixed_code

	if (frame->coding_type == B_VOP)
		BitstreamPutBits(bs, frame->bcode, 3);	// backward_fixed_code

}

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