mbtransquant.c

这是一个压缩解压包,用C语言进行编程的,里面有详细的源代码.

/*****************************************************************************
 *
 *  XVID MPEG-4 VIDEO CODEC
 *  - MB Transfert/Quantization functions -
 *
 *  Copyright(C) 2001-2003  Peter Ross <[e-mail]>
 *               2001-2003  Michael Militzer <[e-mail]>
 *               2003       Edouard Gomez <[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., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 * $Id: mbtransquant.c,v 1.29 2005/11/22 10:23:01 suxen_drol Exp $
 *
 ****************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "../portab.h"
#include "mbfunctions.h"

#include "../global.h"
#include "mem_transfer.h"
#include "timer.h"
#include "../bitstream/mbcoding.h"
#include "../bitstream/zigzag.h"
#include "../dct/fdct.h"
#include "../dct/idct.h"
#include "../quant/quant.h"
#include "../encoder.h"

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

MBFIELDTEST_PTR MBFieldTest;

/*
 * Skip blocks having a coefficient sum below this value. This value will be
 * corrected according to the MB quantizer to avoid artifacts for quant==1
 */
#define PVOP_TOOSMALL_LIMIT 1
#define BVOP_TOOSMALL_LIMIT 3

/*****************************************************************************
 * Local functions
 ****************************************************************************/

/* permute block and return field dct choice */
static __inline uint32_t
MBDecideFieldDCT(int16_t data[6 * 64])
{
	uint32_t field = MBFieldTest(data);

	if (field)
		MBFrameToField(data);

	return field;
}

/* Performs Forward DCT on all blocks */
static __inline void
MBfDCT(const MBParam * const pParam,
	   const FRAMEINFO * const frame,
	   MACROBLOCK * const pMB,
	   uint32_t x_pos,
	   uint32_t y_pos,
	   int16_t data[6 * 64])
{
	/* Handles interlacing */
	start_timer();
	pMB->field_dct = 0;
	if ((frame->vol_flags & XVID_VOL_INTERLACING) &&
		(x_pos>0) && (x_pos<pParam->mb_width-1) &&
		(y_pos>0) && (y_pos<pParam->mb_height-1)) {
		pMB->field_dct = MBDecideFieldDCT(data);
	}
	stop_interlacing_timer();

	/* Perform DCT */
	start_timer();
	fdct((short * const)&data[0 * 64]);
	fdct((short * const)&data[1 * 64]);
	fdct((short * const)&data[2 * 64]);
	fdct((short * const)&data[3 * 64]);
	fdct((short * const)&data[4 * 64]);
	fdct((short * const)&data[5 * 64]);
	stop_dct_timer();
}

/* Performs Inverse DCT on all blocks */
static __inline void
MBiDCT(int16_t data[6 * 64],
	   const uint8_t cbp)
{
	start_timer();
	if(cbp & (1 << (5 - 0))) idct((short * const)&data[0 * 64]);
	if(cbp & (1 << (5 - 1))) idct((short * const)&data[1 * 64]);
	if(cbp & (1 << (5 - 2))) idct((short * const)&data[2 * 64]);
	if(cbp & (1 << (5 - 3))) idct((short * const)&data[3 * 64]);
	if(cbp & (1 << (5 - 4))) idct((short * const)&data[4 * 64]);
	if(cbp & (1 << (5 - 5))) idct((short * const)&data[5 * 64]);
	stop_idct_timer();
}

/* Quantize all blocks -- Intra mode */
static __inline void
MBQuantIntra(const MBParam * pParam,
			 const FRAMEINFO * const frame,
			 const MACROBLOCK * pMB,
			 int16_t qcoeff[6 * 64],
			 int16_t data[6*64])
{
	int mpeg;
	int scaler_lum, scaler_chr;

	quant_intraFuncPtr const quant[2] =
		{
			quant_h263_intra,
			quant_mpeg_intra
		};

	mpeg = !!(pParam->vol_flags & XVID_VOL_MPEGQUANT);
	scaler_lum = get_dc_scaler(pMB->quant, 1);
	scaler_chr = get_dc_scaler(pMB->quant, 0);

	/* Quantize the block */
	start_timer();
	quant[mpeg](&data[0 * 64], &qcoeff[0 * 64], pMB->quant, scaler_lum, pParam->mpeg_quant_matrices);
	quant[mpeg](&data[1 * 64], &qcoeff[1 * 64], pMB->quant, scaler_lum, pParam->mpeg_quant_matrices);
	quant[mpeg](&data[2 * 64], &qcoeff[2 * 64], pMB->quant, scaler_lum, pParam->mpeg_quant_matrices);
	quant[mpeg](&data[3 * 64], &qcoeff[3 * 64], pMB->quant, scaler_lum, pParam->mpeg_quant_matrices);
	quant[mpeg](&data[4 * 64], &qcoeff[4 * 64], pMB->quant, scaler_chr, pParam->mpeg_quant_matrices);
	quant[mpeg](&data[5 * 64], &qcoeff[5 * 64], pMB->quant, scaler_chr, pParam->mpeg_quant_matrices);
	stop_quant_timer();
}

/* DeQuantize all blocks -- Intra mode */
static __inline void
MBDeQuantIntra(const MBParam * pParam,
			   const int iQuant,
			   int16_t qcoeff[6 * 64],
			   int16_t data[6*64])
{
	int mpeg;
	int scaler_lum, scaler_chr;

	quant_intraFuncPtr const dequant[2] =
		{
			dequant_h263_intra,
			dequant_mpeg_intra
		};

	mpeg = !!(pParam->vol_flags & XVID_VOL_MPEGQUANT);
	scaler_lum = get_dc_scaler(iQuant, 1);
	scaler_chr = get_dc_scaler(iQuant, 0);

	start_timer();
	dequant[mpeg](&qcoeff[0 * 64], &data[0 * 64], iQuant, scaler_lum, pParam->mpeg_quant_matrices);
	dequant[mpeg](&qcoeff[1 * 64], &data[1 * 64], iQuant, scaler_lum, pParam->mpeg_quant_matrices);
	dequant[mpeg](&qcoeff[2 * 64], &data[2 * 64], iQuant, scaler_lum, pParam->mpeg_quant_matrices);
	dequant[mpeg](&qcoeff[3 * 64], &data[3 * 64], iQuant, scaler_lum, pParam->mpeg_quant_matrices);
	dequant[mpeg](&qcoeff[4 * 64], &data[4 * 64], iQuant, scaler_chr, pParam->mpeg_quant_matrices);
	dequant[mpeg](&qcoeff[5 * 64], &data[5 * 64], iQuant, scaler_chr, pParam->mpeg_quant_matrices);
	stop_iquant_timer();
}

static int
dct_quantize_trellis_c(int16_t *const Out,
					   const int16_t *const In,
					   int Q,
					   const uint16_t * const Zigzag,
					   const uint16_t * const QuantMatrix,
					   int Non_Zero,
					   int Sum);

/* Quantize all blocks -- Inter mode */
static __inline uint8_t
MBQuantInter(const MBParam * pParam,
			 const FRAMEINFO * const frame,
			 const MACROBLOCK * pMB,
			 int16_t data[6 * 64],
			 int16_t qcoeff[6 * 64],
			 int bvop,
			 int limit)
{

	int i;
	uint8_t cbp = 0;
	int sum;
	int code_block, mpeg;

	quant_interFuncPtr const quant[2] =
		{
			quant_h263_inter,
			quant_mpeg_inter
		};

	mpeg = !!(pParam->vol_flags & XVID_VOL_MPEGQUANT);

	for (i = 0; i < 6; i++) {

		/* Quantize the block */
		start_timer();

		sum = quant[mpeg](&qcoeff[i*64], &data[i*64], pMB->quant, pParam->mpeg_quant_matrices);

		if(sum && (pMB->quant > 2) && (frame->vop_flags & XVID_VOP_TRELLISQUANT)) {
			const uint16_t *matrix;
			const static uint16_t h263matrix[] =
				{
					16, 16, 16, 16, 16, 16, 16, 16,
					16, 16, 16, 16, 16, 16, 16, 16,
					16, 16, 16, 16, 16, 16, 16, 16,
					16, 16, 16, 16, 16, 16, 16, 16,
					16, 16, 16, 16, 16, 16, 16, 16,
					16, 16, 16, 16, 16, 16, 16, 16,
					16, 16, 16, 16, 16, 16, 16, 16,
					16, 16, 16, 16, 16, 16, 16, 16
				};

			matrix = (mpeg)?get_inter_matrix(pParam->mpeg_quant_matrices):h263matrix;
			sum = dct_quantize_trellis_c(&qcoeff[i*64], &data[i*64],
										 pMB->quant, &scan_tables[0][0],
										 matrix,
										 63,
										 sum);
		}
		stop_quant_timer();

		/*
		 * We code the block if the sum is higher than the limit and if the first
		 * two AC coefficients in zig zag order are not zero.
		 */
		code_block = 0;
		if ((sum >= limit) || (qcoeff[i*64+1] != 0) || (qcoeff[i*64+8] != 0)) {
			code_block = 1;
		} else {

			if (bvop && (pMB->mode == MODE_DIRECT || pMB->mode == MODE_DIRECT_NO4V)) {
				/* dark blocks prevention for direct mode */
				if ((qcoeff[i*64] < -1) || (qcoeff[i*64] > 0))
					code_block = 1;
			} else {
				/* not direct mode */
				if (qcoeff[i*64] != 0)
					code_block = 1;
			}
		}

		/* Set the corresponding cbp bit */
		cbp |= code_block << (5 - i);
	}

	return(cbp);
}

/* DeQuantize all blocks -- Inter mode */
static __inline void
MBDeQuantInter(const MBParam * pParam,
			   const int iQuant,
			   int16_t data[6 * 64],
			   int16_t qcoeff[6 * 64],
			   const uint8_t cbp)
{
	int mpeg;

	quant_interFuncPtr const dequant[2] =
		{
			dequant_h263_inter,
			dequant_mpeg_inter
		};

	mpeg = !!(pParam->vol_flags & XVID_VOL_MPEGQUANT);

	start_timer();
	if(cbp & (1 << (5 - 0))) dequant[mpeg](&data[0 * 64], &qcoeff[0 * 64], iQuant, pParam->mpeg_quant_matrices);
	if(cbp & (1 << (5 - 1))) dequant[mpeg](&data[1 * 64], &qcoeff[1 * 64], iQuant, pParam->mpeg_quant_matrices);
	if(cbp & (1 << (5 - 2))) dequant[mpeg](&data[2 * 64], &qcoeff[2 * 64], iQuant, pParam->mpeg_quant_matrices);
	if(cbp & (1 << (5 - 3))) dequant[mpeg](&data[3 * 64], &qcoeff[3 * 64], iQuant, pParam->mpeg_quant_matrices);
	if(cbp & (1 << (5 - 4))) dequant[mpeg](&data[4 * 64], &qcoeff[4 * 64], iQuant, pParam->mpeg_quant_matrices);
	if(cbp & (1 << (5 - 5))) dequant[mpeg](&data[5 * 64], &qcoeff[5 * 64], iQuant, pParam->mpeg_quant_matrices);
	stop_iquant_timer();
}

typedef void (transfer_operation_8to16_t) (int16_t *Dst, const uint8_t *Src, int BpS);
typedef void (transfer_operation_16to8_t) (uint8_t *Dst, const int16_t *Src, int BpS);


static __inline void
MBTrans8to16(const MBParam * const pParam,
			 const FRAMEINFO * const frame,
			 const MACROBLOCK * const pMB,
			 const uint32_t x_pos,
			 const uint32_t y_pos,
			 int16_t data[6 * 64])
{
	uint32_t stride = pParam->edged_width;
	uint32_t stride2 = stride / 2;
	uint32_t next_block = stride * 8;
	uint8_t *pY_Cur, *pU_Cur, *pV_Cur;
	const IMAGE * const pCurrent = &frame->image;

	/* Image pointers */
	pY_Cur = pCurrent->y + (y_pos << 4) * stride  + (x_pos << 4);
	pU_Cur = pCurrent->u + (y_pos << 3) * stride2 + (x_pos << 3);
	pV_Cur = pCurrent->v + (y_pos << 3) * stride2 + (x_pos << 3);

	/* Do the transfer */
	start_timer();
	transfer_8to16copy(&data[0 * 64], pY_Cur, stride);
	transfer_8to16copy(&data[1 * 64], pY_Cur + 8, stride);
	transfer_8to16copy(&data[2 * 64], pY_Cur + next_block, stride);
	transfer_8to16copy(&data[3 * 64], pY_Cur + next_block + 8, stride);
	transfer_8to16copy(&data[4 * 64], pU_Cur, stride2);
	transfer_8to16copy(&data[5 * 64], pV_Cur, stride2);
	stop_transfer_timer();
}

static __inline void
MBTrans16to8(const MBParam * const pParam,
			 const FRAMEINFO * const frame,
			 const MACROBLOCK * const pMB,
			 const uint32_t x_pos,
			 const uint32_t y_pos,
			 int16_t data[6 * 64],
			 const uint32_t add, /* Must be 1 or 0 */
			 const uint8_t cbp)
{
	uint8_t *pY_Cur, *pU_Cur, *pV_Cur;
	uint32_t stride = pParam->edged_width;
	uint32_t stride2 = stride / 2;
	uint32_t next_block = stride * 8;
	const IMAGE * const pCurrent = &frame->image;

	/* Array of function pointers, indexed by [add] */
	transfer_operation_16to8_t  * const functions[2] =
		{
			(transfer_operation_16to8_t*)transfer_16to8copy,
			(transfer_operation_16to8_t*)transfer_16to8add,
		};

	transfer_operation_16to8_t *transfer_op = NULL;

	/* Image pointers */
	pY_Cur = pCurrent->y + (y_pos << 4) * stride  + (x_pos << 4);
	pU_Cur = pCurrent->u + (y_pos << 3) * stride2 + (x_pos << 3);
	pV_Cur = pCurrent->v + (y_pos << 3) * stride2 + (x_pos << 3);

	if (pMB->field_dct) {
		next_block = stride;
		stride *= 2;
	}

	/* Operation function */
	transfer_op = functions[add];

	/* Do the operation */
	start_timer();
	if (cbp&32) transfer_op(pY_Cur,						&data[0 * 64], stride);
	if (cbp&16) transfer_op(pY_Cur + 8,					&data[1 * 64], stride);
	if (cbp& 8) transfer_op(pY_Cur + next_block,		&data[2 * 64], stride);
	if (cbp& 4) transfer_op(pY_Cur + next_block + 8,	&data[3 * 64], stride);
	if (cbp& 2) transfer_op(pU_Cur,						&data[4 * 64], stride2);
	if (cbp& 1) transfer_op(pV_Cur,						&data[5 * 64], stride2);
	stop_transfer_timer();
}

/*****************************************************************************
 * Module functions
 ****************************************************************************/

void
MBTransQuantIntra(const MBParam * const pParam,
				  const FRAMEINFO * const frame,
				  MACROBLOCK * const pMB,
				  const uint32_t x_pos,
				  const uint32_t y_pos,
				  int16_t data[6 * 64],
				  int16_t qcoeff[6 * 64])
{

	/* Transfer data */
	MBTrans8to16(pParam, frame, pMB, x_pos, y_pos, data);

	/* Perform DCT (and field decision) */
	MBfDCT(pParam, frame, pMB, x_pos, y_pos, data);

	/* Quantize the block */
	MBQuantIntra(pParam, frame, pMB, data, qcoeff);

	/* DeQuantize the block */
	MBDeQuantIntra(pParam, pMB->quant, data, qcoeff);

	/* Perform inverse DCT*/
	MBiDCT(data, 0x3F);

 	/* Transfer back the data -- Don't add data */
	MBTrans16to8(pParam, frame, pMB, x_pos, y_pos, data, 0, 0x3F);
}


uint8_t
MBTransQuantInter(const MBParam * const pParam,
				  const FRAMEINFO * const frame,
				  MACROBLOCK * const pMB,
				  const uint32_t x_pos,
				  const uint32_t y_pos,
				  int16_t data[6 * 64],
				  int16_t qcoeff[6 * 64])
{
	uint8_t cbp;
	uint32_t limit;

	/* There is no MBTrans8to16 for Inter block, that's done in motion compensation
	 * already */

	/* Perform DCT (and field decision) */
	MBfDCT(pParam, frame, pMB, x_pos, y_pos, data);

	/* Set the limit threshold */
	limit = PVOP_TOOSMALL_LIMIT + ((pMB->quant == 1)? 1 : 0);

	if (frame->vop_flags & XVID_VOP_CARTOON)