zigzag.h

jpeg and mpeg 编解码技术源代码

#ifndef _ZIGZAG_H_
#define _ZIGZAG_H_

static const uint16_t scan_tables[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_ */