datatype.h

Go to the documentation of this file.

/*--------------------------------------------------------------------
 *
 * (C) Copyright Koninklijke Philips Electronics NV 2006. 
 * All rights reserved. This software is licensed under the terms of
 * version 2.1 of the GNU Lesser General Public License as published 
 * by the Free Software Foundation. For licensing and warranty
 * information, see the file COPYING in the main directory.
 *
 *------------------------------------------------------------------*/

#ifndef DATA_H
#define DATA_H

#include <stdio.h>

#define first_quad(c)   ((c)>>4)        /* first 4 bits in file order */
#define second_quad(c)  ((c)&15)

#define ceil_div(N, D)  ( (N>(D*(N/D)))? (N/D)+1 : N/D )
#define floor_div(N, D) ( (N<(D*(N/D)))? (N/D)-1 : N/D )

/*--------------------------------------*/
/* JPEG data types      */
/*--------------------------------------*/

typedef unsigned char VYAimageComponent;
typedef unsigned char VYAimageDepth;
typedef unsigned int  VYAimageH;
typedef unsigned int  VYAimageV;
typedef unsigned int  VYAimageX;
typedef unsigned int  VYAimageY;
typedef unsigned char VYAid;
typedef unsigned char VYAbyte;

typedef unsigned char Bits;
typedef unsigned int  Marker;

/*--------------------------------------*/
/* JPEG format parsing markers    */
/*--------------------------------------*/

const Marker SOI_MK=0xFFD8;   /* start of image   */
const Marker COM_MK=0xFFFE;   /* comment segment    */
const Marker APP_MK=0xFFE0;   /* application data     */
const Marker DQT_MK=0xFFDB;   /* quantization table   */
const Marker SOF_MK=0xFFC0;   /* start of frame   */
const Marker DHT_MK=0xFFC4;   /* Huffman table    */
const Marker SOS_MK=0xFFDA;   /* start of data    */
const Marker DRI_MK=0xFFDD;   /* define restart interval  */
const Marker EOI_MK=0xFFD9;   /* end of image     */

const Marker MK_MSK=0xFFF0;   /* marker mask */
#define RST_MK(x) ( (0xFFF8&(x)) == 0xFFD0 )
      /* is x a restart interval ? */


/*--------------------------------------*/
/* Image component      */
/*--------------------------------------*/

struct ImageComponent
{
  unsigned char CID;          /* component ID     */
  unsigned char IDX;          /* index of first block in MCU  */

  unsigned char HS;         /* sampling factors     */
  unsigned char VS;
  unsigned char HDIV;         /* sample width ratios    */
  unsigned char VDIV; 

  char QT;                  /* QTable index, 2bits    */
  char DC_HT;                 /* DC table index, 1bit   */
  char AC_HT;                 /* AC table index, 1bit   */
  int  PRED;                  /* DC predictor value     */
}; 

#if defined(WIN32)
template<class T>
T min(const T& a, const T& b)
{
  return a < b ? a : b;
}
#else
using std::min;
#endif

#endif

---