scan.h

DM642的mpeg4编码

#ifndef _SCAN_H_
#define _SCAN_H_

static unsigned short zigzag[8][8] = 
{
	{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},
};

static unsigned short Table[3][64] = 
{
	/* zig_zag_scan */
	{ 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},
		
		/* horizontal_scan */
	{ 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},
	
	/* vertical_scan */
	{ 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}
};

#endif							/* _ZIGZAG_H_ */