jpeg.h

jpeg压缩程序

/**
***  This file includes some parametre tables used in JPEG.
**
*/

/*
**  Quantization table for luminance coefficients
**
*/

unsigned char
      qu_table[8][8]={
		       16, 11, 10, 16, 24, 40, 51, 61,
		       12, 12, 14, 19, 26, 58, 60, 55,
		       14, 13, 16, 24, 40, 57, 69, 56,
		       14, 17, 22, 29, 51, 87, 80, 62,
		       18, 22, 37, 58, 68,109,103, 77,
		       24, 35, 55, 64, 81,104,113, 92,
		       49, 64, 78, 87,103,121,120,101,
		       72, 92, 95, 98,112,100,103, 99
		      };
/*
** Quantization table for chrominance coefficients
**
*/

unsigned char
	co_qu_table[8][8]={
		       17, 18, 24, 47, 99, 99, 99, 99,
		       18, 21, 26, 66, 99, 99, 99, 99,
		       24, 26, 56, 99, 99, 99, 99, 99,
		       47, 66, 99, 99, 99, 99, 99, 99,
		       99, 99, 99, 99, 99, 99, 99, 99,
		       99, 99, 99, 99, 99, 99, 99, 99,
		       99, 99, 99, 99, 99, 99, 99, 99,
		       99, 99, 99, 99, 99, 99, 99, 99
		       };

/*
**   Table used to indicate the zig-zag sequence.
**
*/

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

/*
**    Table used to calculate the code length of DCT DC_coefficients
**    for luminance block.
**
*/

static unsigned char
      dc_bits[16]={
		   0x00,0x01,0x05,0x01,0x01,0x01,0x01,0x01,
		   0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00
		 };


/*
**    Table used to calculate the code length of DCT DC_coefficients
**    for chrominance block.
**
*/

static unsigned char
      co_dc_bits[16]={
		    0x00,0x03,0x01,0x01,0x01,0x01,0x01,0x01,
		    0x01,0x01,0x01,0x00,0x00,0x00,0x00,0x00
		    };


/*
**   Table used to calculate the code length of DCT AC_coefficients
**   for luminance block.
**
*/

static unsigned char
      ac_bits[16]={
		   0x00,0x02,0x01,0x03,0x03,0x02,0x04,0x03,
		   0x05,0x05,0x04,0x04,0x00,0x00,0x01,0x7d
		     };

/*
**   Table used to calculate the code length of DCT AC_coefficients
**   for chrominance table.
**
*/

static unsigned char
     co_ac_bits[16]={
		    0x00,0x02,0x01,0x02,0x04,0x04,0x03,0x04,
		    0x07,0x05,0x04,0x04,0x00,0x01,0x02,0x77
		    };

/*
**   Parametres used to generate the DC_coefficient huffman table
**   for luminance block.
**
*/

static unsigned char
      dc_huffval[12]={
		      0x00,0x01,0x02,0x03,0x04,0x05,
		      0x06,0x07,0x08,0x09,0x0A,0x0B
			};

/*
**   Parametres used to generate the DC_coefficient huffman table
**   for chrominance block.
**
*/

static unsigned char
      co_dc_huffval[12]={
		      0x00,0x01,0x02,0x03,0x04,0x05,
		      0x06,0x07,0x08,0x09,0x0A,0x0B
			};


/*
**   Parametres used to generate the AC_coefficient huffman table
**   for luminance block.
**
*/

static unsigned char
      ac_huffval[162]={
		       0x01,0x02,0x03,0x00,0x04,0x11,0x05,0x12,0x21,0x31,
		       0x41,0x06,0x13,0x51,0x61,0x07,0x22,0x71,0x14,0x32,
		       0x81,0x91,0xA1,0x08,0x23,0x42,0xB1,0xC1,0x15,0x52,
		       0xD1,0xF0,0x24,0x33,0x62,0x72,0x82,0x09,0x0A,0x16,
		       0x17,0x18,0x19,0x1A,0x25,0x26,0x27,0x28,0x29,0x2A,
		       0x34,0x35,0x36,0x37,0x38,0x39,0x3A,0x43,0x44,0x45,
		       0x46,0x47,0x48,0x49,0x4A,0x53,0x54,0x55,0x56,0x57,
		       0x58,0x59,0x5A,0x63,0x64,0x65,0x66,0x67,0x68,0x69,
		       0x6A,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7A,0x83,
		       0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x92,0x93,0x94,
		       0x95,0x96,0x97,0x98,0x99,0x9A,0xA2,0xA3,0xA4,0xA5,
		       0xA6,0xA7,0xA8,0xA9,0xAA,0xB2,0xB3,0xB4,0xB5,0xB6,
		       0xB7,0xB8,0xB9,0xBA,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,
		       0xC8,0xC9,0xCA,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,
		       0xD9,0xDA,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,
		       0xE9,0xEA,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,
		       0xF9,0xFA
		      };

/*
**   Parametres used to generate the AC_coefficient huffman table
**   for chrominance block.
**
*/

static unsigned char
      co_ac_huffval[162]={
		       0x00,0x01,0x02,0x03,0x11,0x04,0x05,0x21,0x31,0x06,
		       0x12,0x41,0x51,0x07,0x61,0x71,0x13,0x22,0x32,0x81,
		       0x08,0x14,0x42,0x91,0xa1,0xb1,0xc1,0x09,0x23,0x33,
		       0x52,0xF0,0x15,0x62,0x72,0xd1,0x0a,0x16,0x24,0x34,
		       0xe1,0x25,0xf1,0x17,0x18,0x19,0x1a,0x26,0x27,0x28,
		       0x29,0x2a,0x35,0x36,0x37,0x38,0x39,0x3a,0x43,0x44,
		       0x45,0x46,0x47,0x48,0x49,0x4a,0x53,0x54,0x55,0x56,
		       0x57,0x58,0x59,0x5a,0x63,0x64,0x65,0x66,0x67,0x68,
		       0x69,0x6a,0x73,0x74,0x75,0x76,0x77,0x78,0x79,0x7a,
		       0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8a,0x92,
		       0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9a,0xA2,0xA3,
		       0xA4,0xA5,0xA6,0xA7,0xA8,0xa9,0xaa,0xB2,0xB3,0xB4,
		       0xB5,0xB6,0xB7,0xB8,0xb9,0xba,0xC2,0xC3,0xC4,0xC5,
		       0xC6,0xC7,0xC8,0xc9,0xca,0xD2,0xD3,0xD4,0xD5,0xD6,
		       0xD7,0xD8,0xd9,0xda,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,
		       0xE8,0xE9,0xea,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,
		       0xF9,0xFA
		      };