zigzag.h

基于Linux的ffmepg decoder

#ifndef _ZIGZAG_H_
#define _ZIGZAG_H_
/*
static const uint16_t scan_tables[3][64] = {
	{
 		 0,  8,  1,  2,  9, 16, 24, 17, 
		10,  3,  4, 11, 18, 25, 32, 40, 
		33, 26, 19, 12,  5,  6, 13, 20, 
		27, 34, 41, 48, 56, 49, 42, 35, 
		28, 21, 14,  7, 15, 22, 29, 36, 
		43, 50, 57, 58, 51, 44, 37, 30, 
		23, 31, 38, 45, 52, 59, 60, 53, 
		46, 39, 47, 54, 61, 62, 55, 63},

	{
		 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},

	{
		 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}
};
*/

static const uint8_t scan_tables[3][64] = {
	{
 		 0*2,  8*2,  1*2,  2*2,  9*2, 16*2, 24*2, 17*2, 
		10*2,  3*2,  4*2, 11*2, 18*2, 25*2, 32*2, 40*2, 
		33*2, 26*2, 19*2, 12*2,  5*2,  6*2, 13*2, 20*2, 
		27*2, 34*2, 41*2, 48*2, 56*2, 49*2, 42*2, 35*2, 
		28*2, 21*2, 14*2,  7*2, 15*2, 22*2, 29*2, 36*2, 
		43*2, 50*2, 57*2, 58*2, 51*2, 44*2, 37*2, 30*2, 
		23*2, 31*2, 38*2, 45*2, 52*2, 59*2, 60*2, 53*2, 
		46*2, 39*2, 47*2, 54*2, 61*2, 62*2, 55*2, 63*2},

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

	{
		 0*2,  1*2,  2*2,  3*2,  8*2,  9*2, 16*2, 17*2, 
		10*2, 11*2,  4*2,  5*2,  6*2,  7*2, 15*2, 14*2, 
		13*2, 12*2, 19*2, 18*2, 24*2, 25*2, 32*2, 33*2, 
		26*2, 27*2, 20*2, 21*2, 22*2, 23*2, 28*2, 29*2, 
		30*2, 31*2, 34*2, 35*2, 40*2, 41*2, 48*2, 49*2, 
		42*2, 43*2, 36*2, 37*2, 38*2, 39*2, 44*2, 45*2, 
		46*2, 47*2, 50*2, 51*2, 56*2, 57*2, 58*2, 59*2, 
		52*2, 53*2, 54*2, 55*2, 60*2, 61*2, 62*2, 63*2}
};
/*
static const uint16_t scan_tables[3][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},

	{
	 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},

	{
	 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_ */