quant_matrix.c

mpeg4代码,比较具体

/*****************************************************************************
 *
 *  XVID MPEG-4 VIDEO CODEC
 *  - Custom matrix quantization functions -
 *
 *  Copyright(C) 2002 Michael Militzer <[e-mail]>
 *               2002 Peter Ross <[e-mail]>
 *
 *  This file is part of XviD, a free MPEG-4 video encoder/decoder
 *
 *  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.
 *
 *  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
 *
 *  Under section 8 of the GNU General Public License, the copyright
 *  holders of XVID explicitly forbid distribution in the following
 *  countries:
 *
 *    - Japan
 *    - United States of America
 *
 *  Linking XviD statically or dynamically with other modules is making a
 *  combined work based on XviD.  Thus, the terms and conditions of the
 *  GNU General Public License cover the whole combination.
 *
 *  As a special exception, the copyright holders of XviD give you
 *  permission to link XviD with independent modules that communicate with
 *  XviD solely through the VFW1.1 and DShow interfaces, regardless of the
 *  license terms of these independent modules, and to copy and distribute
 *  the resulting combined work under terms of your choice, provided that
 *  every copy of the combined work is accompanied by a complete copy of
 *  the source code of XviD (the version of XviD used to produce the
 *  combined work), being distributed under the terms of the GNU General
 *  Public License plus this exception.  An independent module is a module
 *  which is not derived from or based on XviD.
 *
 *  Note that people who make modified versions of XviD are not obligated
 *  to grant this special exception for their modified versions; it is
 *  their choice whether to do so.  The GNU General Public License gives
 *  permission to release a modified version without this exception; this
 *  exception also makes it possible to release a modified version which
 *  carries forward this exception.
 *
 * $Id: quant_matrix.c,v 1.12 2002/11/17 00:41:19 edgomez Exp $
 *
 ****************************************************************************/

#include "quant_matrix.h"

#define FIX(X) (1 << 16) / (X) + 1

/*****************************************************************************
 * Local data
 ****************************************************************************/

/* ToDo : remove all this local to make this module thread safe */
uint8_t custom_intra_matrix = 0;
uint8_t custom_inter_matrix = 0;

uint8_t default_intra_matrix[64] = {
	8, 17, 18, 19, 21, 23, 25, 27,
	17, 18, 19, 21, 23, 25, 27, 28,
	20, 21, 22, 23, 24, 26, 28, 30,
	21, 22, 23, 24, 26, 28, 30, 32,
	22, 23, 24, 26, 28, 30, 32, 35,
	23, 24, 26, 28, 30, 32, 35, 38,
	25, 26, 28, 30, 32, 35, 38, 41,
	27, 28, 30, 32, 35, 38, 41, 45
};

int16_t intra_matrix[64] = {
	8, 17, 18, 19, 21, 23, 25, 27,
	17, 18, 19, 21, 23, 25, 27, 28,
	20, 21, 22, 23, 24, 26, 28, 30,
	21, 22, 23, 24, 26, 28, 30, 32,
	22, 23, 24, 26, 28, 30, 32, 35,
	23, 24, 26, 28, 30, 32, 35, 38,
	25, 26, 28, 30, 32, 35, 38, 41,
	27, 28, 30, 32, 35, 38, 41, 45
};

int16_t intra_matrix_fix[64] = {
	FIX(8), FIX(17), FIX(18), FIX(19), FIX(21), FIX(23), FIX(25), FIX(27),
	FIX(17), FIX(18), FIX(19), FIX(21), FIX(23), FIX(25), FIX(27), FIX(28),
	FIX(20), FIX(21), FIX(22), FIX(23), FIX(24), FIX(26), FIX(28), FIX(30),
	FIX(21), FIX(22), FIX(23), FIX(24), FIX(26), FIX(28), FIX(30), FIX(32),
	FIX(22), FIX(23), FIX(24), FIX(26), FIX(28), FIX(30), FIX(32), FIX(35),
	FIX(23), FIX(24), FIX(26), FIX(28), FIX(30), FIX(32), FIX(35), FIX(38),
	FIX(25), FIX(26), FIX(28), FIX(30), FIX(32), FIX(35), FIX(38), FIX(41),
	FIX(27), FIX(28), FIX(30), FIX(32), FIX(35), FIX(38), FIX(41), FIX(45)
};

uint8_t default_inter_matrix[64] = {
	16, 17, 18, 19, 20, 21, 22, 23,
	17, 18, 19, 20, 21, 22, 23, 24,
	18, 19, 20, 21, 22, 23, 24, 25,
	19, 20, 21, 22, 23, 24, 26, 27,
	20, 21, 22, 23, 25, 26, 27, 28,
	21, 22, 23, 24, 26, 27, 28, 30,
	22, 23, 24, 26, 27, 28, 30, 31,
	23, 24, 25, 27, 28, 30, 31, 33
};

int16_t inter_matrix[64] = {
	16, 17, 18, 19, 20, 21, 22, 23,
	17, 18, 19, 20, 21, 22, 23, 24,
	18, 19, 20, 21, 22, 23, 24, 25,
	19, 20, 21, 22, 23, 24, 26, 27,
	20, 21, 22, 23, 25, 26, 27, 28,
	21, 22, 23, 24, 26, 27, 28, 30,
	22, 23, 24, 26, 27, 28, 30, 31,
	23, 24, 25, 27, 28, 30, 31, 33
};

int16_t inter_matrix_fix[64] = {
	FIX(16), FIX(17), FIX(18), FIX(19), FIX(20), FIX(21), FIX(22), FIX(23),
	FIX(17), FIX(18), FIX(19), FIX(20), FIX(21), FIX(22), FIX(23), FIX(24),
	FIX(18), FIX(19), FIX(20), FIX(21), FIX(22), FIX(23), FIX(24), FIX(25),
	FIX(19), FIX(20), FIX(21), FIX(22), FIX(23), FIX(24), FIX(26), FIX(27),
	FIX(20), FIX(21), FIX(22), FIX(23), FIX(25), FIX(26), FIX(27), FIX(28),
	FIX(21), FIX(22), FIX(23), FIX(24), FIX(26), FIX(27), FIX(28), FIX(30),
	FIX(22), FIX(23), FIX(24), FIX(26), FIX(27), FIX(28), FIX(30), FIX(31),
	FIX(23), FIX(24), FIX(25), FIX(27), FIX(28), FIX(30), FIX(31), FIX(33)
};

/*****************************************************************************
 * Functions
 ****************************************************************************/

uint8_t
get_intra_matrix_status(void)
{
	return custom_intra_matrix;
}

uint8_t
get_inter_matrix_status(void)
{
	return custom_inter_matrix;
}

void
set_intra_matrix_status(uint8_t status)
{
	custom_intra_matrix = status;
}

void
set_inter_matrix_status(uint8_t status)
{
	custom_inter_matrix = status;
}

int16_t *
get_intra_matrix(void)
{
	return intra_matrix;
}

int16_t *
get_inter_matrix(void)
{
	return inter_matrix;
}

uint8_t *
get_default_intra_matrix(void)
{
	return default_intra_matrix;
}

uint8_t *
get_default_inter_matrix(void)
{
	return default_inter_matrix;
}

uint8_t
set_intra_matrix(uint8_t * matrix)
{
	int i, change = 0;

	custom_intra_matrix = 0;

	for (i = 0; i < 64; i++) {
		if ((int16_t) default_intra_matrix[i] != matrix[i])
			custom_intra_matrix = 1;
		if (intra_matrix[i] != matrix[i])
			change = 1;

		intra_matrix[i] = (int16_t) matrix[i];
		intra_matrix_fix[i] = FIX(intra_matrix[i]);
	}
	return /*custom_intra_matrix |*/ change;
}


uint8_t
set_inter_matrix(uint8_t * matrix)
{
	int i, change = 0;

	custom_inter_matrix = 0;

	for (i = 0; i < 64; i++) {
		if ((int16_t) default_inter_matrix[i] != matrix[i])
			custom_inter_matrix = 1;
		if (inter_matrix[i] != matrix[i])
			change = 1;

		inter_matrix[i] = (int16_t) matrix[i];
		inter_matrix_fix[i] = FIX(inter_matrix[i]);
	}
	return /*custom_inter_matrix |*/ change;
}