mp4_tables.c

实现在linux下的mpeg4编解码

/**************************************************************************
 *                                                                        *
 * This code has been developed by Andrea Graziani. This software 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 (including Project Mayo), will have no liability for use of  *
 * this software or modifications or derivatives thereof.                 *
 *                                                                        *
 * Project Mayo gives users of the Codec a license to this software       *
 * module or modifications thereof for use in hardware or software        *
 * products claiming conformance to the MPEG-4 Video Standard as          *
 * described in the Open DivX license.                                    *
 *                                                                        *
 * The complete Open DivX license can be found at                         *
 * http://www.projectmayo.com/opendivx/license.php                        *
 *                                                                        *
 **************************************************************************/
/**
*  Copyright (C) 2001 - Project Mayo
 *
 * Andrea Graziani (Ag)
 * Jonathan White
 *
 * DivX Advanced Research Center <[e-mail]>
*
**/

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

#include "portab.h"
#include "mp4_vars.h"


extern	unsigned int zig_zag_scan[64];
extern	unsigned int alternate_horizontal_scan[64];
extern	unsigned int alternate_vertical_scan[64];
extern	unsigned int intra_quant_matrix[64];
extern	unsigned int nonintra_quant_matrix[64];


extern	unsigned int msk[33];
extern	int roundtab[16];
extern	int saiAcLeftIndex[8];
extern	int DQtab[4];
extern	tab_type MCBPCtabIntra[32];
extern	tab_type MCBPCtabInter[256];
extern	tab_type CBPYtab[48];
extern	tab_type MVtab0[14];
extern	tab_type MVtab1[96];
extern	tab_type MVtab2[124];
extern	tab_type tableB16_1[112];
extern	tab_type tableB16_2[96];
extern	tab_type tableB16_3[120];
extern	tab_type tableB17_1[112];
extern	tab_type tableB17_2[96];
extern	tab_type tableB17_3[120];


void save_tables(MP4_TABLES * tables) 
{
	// FILE * ftables;

	memcpy(tables->zig_zag_scan, zig_zag_scan, sizeof(zig_zag_scan));
	memcpy(tables->alternate_vertical_scan, alternate_vertical_scan, sizeof(alternate_vertical_scan));
	memcpy(tables->alternate_horizontal_scan, alternate_horizontal_scan, sizeof(alternate_horizontal_scan));
	memcpy(tables->intra_quant_matrix, intra_quant_matrix, sizeof(intra_quant_matrix));
	memcpy(tables->nonintra_quant_matrix, nonintra_quant_matrix, sizeof(nonintra_quant_matrix));
	memcpy(tables->msk, msk, sizeof(msk));
	memcpy(tables->roundtab, roundtab, sizeof(roundtab));
	memcpy(tables->saiAcLeftIndex, saiAcLeftIndex, sizeof( saiAcLeftIndex));
	memcpy(tables->DQtab, DQtab, sizeof( DQtab));
	memcpy(tables->MCBPCtabIntra, MCBPCtabIntra, sizeof( MCBPCtabIntra));
	memcpy(tables->MCBPCtabInter, MCBPCtabInter, sizeof( MCBPCtabInter));
	memcpy(tables->CBPYtab, CBPYtab, sizeof( CBPYtab));
	memcpy(tables->MVtab0, MVtab0, sizeof( MVtab0));
	memcpy(tables->MVtab1, MVtab1, sizeof( MVtab1));
	memcpy(tables->MVtab2, MVtab2, sizeof( MVtab2));
	memcpy(tables->tableB16_1, tableB16_1, sizeof( tableB16_1));
	memcpy(tables->tableB16_2, tableB16_2, sizeof( tableB16_2));
	memcpy(tables->tableB16_3, tableB16_3, sizeof( tableB16_3));
	memcpy(tables->tableB17_1, tableB17_1, sizeof( tableB17_1));
	memcpy(tables->tableB17_2, tableB17_2, sizeof( tableB17_2));
	memcpy(tables->tableB17_3, tableB17_3, sizeof( tableB17_3));

	// ftables = fopen("mp4_tables.bin", "wb");	
	// fwrite(tables, sizeof(char), sizeof(MP4_TABLES), ftables);
	// fclose(ftables);
}

// zig-zag scan
unsigned int zig_zag_scan[64] =
{
  0, 1, 8, 16, 9, 2, 3, 10, 17, 24, 32, 25, 18, 11, 4, 5,
  12, 19, 26, 33, 40, 48, 41, 34, 27, 20, 13, 6, 7, 14, 21, 28,
  35, 42, 49, 56, 57, 50, 43, 36, 29, 22, 15, 23, 30, 37, 44, 51,
  58, 59, 52, 45, 38, 31, 39, 46, 53, 60, 61, 54, 47, 55, 62, 63
};

// other scan orders
unsigned int alternate_horizontal_scan[64] =
{
   0,  1,  2,  3,  8,  9, 16, 17, 
	10, 11,  4,  5,  6,  7, 15, 14,
  13, 12, 19, 18, 24, 25, 32, 33, 
	26, 27, 20, 21, 22, 23, 28, 29,
  30, 31, 34, 35, 40, 41, 48, 49, 
	42, 43, 36, 37, 38, 39, 44, 45,
  46, 47, 50, 51, 56, 57, 58, 59, 
	52, 53, 54, 55, 60, 61, 62, 63
};

unsigned int alternate_vertical_scan[64] =
{
   0,  8, 16, 24,  1,  9,  2, 10, 
	17, 25, 32, 40, 48, 56, 57, 49,
  41, 33, 26, 18,  3, 11,  4, 12, 
	19, 27, 34, 42, 50, 58, 35, 43,
  51, 59, 20, 28,  5, 13,  6, 14, 
	21, 29, 36, 44, 52, 60, 37, 45,
  53, 61, 22, 30,  7, 15, 23, 31, 
	38, 46, 54, 62, 39, 47, 55, 63
};

unsigned int intra_quant_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
};

unsigned int nonintra_quant_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
};

// to mask the n least significant bits of an integer 
unsigned int msk[33] =
{
  0x00000000, 0x00000001, 0x00000003, 0x00000007,
  0x0000000f, 0x0000001f, 0x0000003f, 0x0000007f,
  0x000000ff, 0x000001ff, 0x000003ff, 0x000007ff,
  0x00000fff, 0x00001fff, 0x00003fff, 0x00007fff,
  0x0000ffff, 0x0001ffff, 0x0003ffff, 0x0007ffff,
  0x000fffff, 0x001fffff, 0x003fffff, 0x007fffff,
  0x00ffffff, 0x01ffffff, 0x03ffffff, 0x07ffffff,
  0x0fffffff, 0x1fffffff, 0x3fffffff, 0x7fffffff,
  0xffffffff
};

int roundtab[16] = {0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2};

int saiAcLeftIndex[8] = 
{
	0, 8,16,24,32,40,48,56
};

int DQtab[4] = {
	-1, -2, 1, 2
};

tab_type MCBPCtabIntra[32] = {
	{-1,0},
	{20,6}, {36,6}, {52,6}, {4,4}, {4,4}, {4,4}, 
	{4,4}, {19,3}, {19,3}, {19,3}, {19,3}, {19,3}, 
	{19,3}, {19,3}, {19,3}, {35,3}, {35,3}, {35,3}, 
	{35,3}, {35,3}, {35,3}, {35,3}, {35,3}, {51,3}, 
	{51,3}, {51,3}, {51,3}, {51,3}, {51,3}, {51,3}, 
	{51,3},