?? dct.h
字號:
#include "DataType.h"
void ffdct(LINT8 *mcubyte, LINT32 *array)
{
LINT32 tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
LINT32 tmp10, tmp11, tmp12, tmp13;
LINT32 z1, z2, z3, z4, z5, z11, z13;
LINT32* dataptr;
LINT8* datain;
int ctr;
datain = mcubyte;
dataptr = array;
for(ctr=0;ctr<64;ctr++)
{
dataptr[ctr]=datain[ctr]-128;
}
/* 第一部分,對行進行計算 */
for (ctr = 7; ctr >= 0; ctr--)
{
tmp0 = dataptr[0] + dataptr[7];
tmp7 = dataptr[0] - dataptr[7];
tmp1 = dataptr[1] + dataptr[6];
tmp6 = dataptr[1] - dataptr[6];
tmp2 = dataptr[2] + dataptr[5];
tmp5 = dataptr[2] - dataptr[5];
tmp3 = dataptr[3] + dataptr[4];
tmp4 = dataptr[3] - dataptr[4];
/* 對偶數項進行運算 */
tmp10 = tmp0 + tmp3; /* 相位2 */
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
dataptr[0] = tmp10 + tmp11; /*相位3 */
dataptr[4] = tmp10 - tmp11;
z1 = (tmp12 + tmp13) * (46341); /* c4 / 0.707106781 */
z1 = z1 >> 16;
dataptr[2] = tmp13 + z1; /* 相位 5 */
dataptr[6] = tmp13 - z1;
/* 對奇數項進行計算 */
tmp10 = tmp4 + tmp5; /* 相位2 */
tmp11 = tmp5 + tmp6;
tmp12 = tmp6 + tmp7;
z5 = (tmp10 - tmp12) * (25080); /* c6 /0.382683433 */
z5 = z5 >> 16;
z2 = tmp10*(35468);
z2 = z2 >> 16;
z2 = z2 + z5;
z4 = tmp12 * (85627);
z4 = z4 >> 16;
z4 = z4 + z5;
z3 = tmp11 * (46341); /* c4 / 0.707106781*/
z3 = z3 >> 16;
z11 = tmp7 + z3; /* 相位 5 */
z13 = tmp7 - z3;
dataptr[5] = z13 + z2; /* 相位 6 */
dataptr[3] = z13 - z2;
dataptr[1] = z11 + z4;
dataptr[7] = z11 - z4;
dataptr += 8; /* 將指針指向下一行 */
}
/* 第二部分,對列進行計算 */
dataptr = array;
for (ctr = 7; ctr >= 0; ctr--)
{
tmp0 = dataptr[0] + dataptr[56];
tmp7 = dataptr[0] - dataptr[56];
tmp1 = dataptr[8] + dataptr[48];
tmp6 = dataptr[8] - dataptr[48];
tmp2 = dataptr[16] + dataptr[40];
tmp5 = dataptr[16] - dataptr[40];
tmp3 = dataptr[24] + dataptr[32];
tmp4 = dataptr[24] - dataptr[32];
/* 對偶數項進行運算 */
tmp10 = tmp0 + tmp3; /* 相位 2 */
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
dataptr[0] = tmp10 + tmp11; /* 相位3 */
dataptr[32] = tmp10 - tmp11;
z1 = (tmp12 + tmp13) * (46341); /* c4 / 0.707106781 */
z1 = z1 >> 16;
dataptr[16] = tmp13 + z1; /* 相位5 */
dataptr[48] = tmp13 - z1;
/* 對奇數項進行計算 */
tmp10 = tmp4 + tmp5; /* phase 2 */
tmp11 = tmp5 + tmp6;
tmp12 = tmp6 + tmp7;
z5 = (tmp10 - tmp12) * (25080); /* c6 /0.382683433 */
z5 = z5 >> 16;
z2 = tmp10*(35468);
z2 = z2 >> 16;
z2 = z2 + z5;
z4 = tmp12 * (85627);
z4 = z4 >> 16;
z4 = z4 + z5;
z3 = tmp11 * (46341); /* c4 / 0.707106781*/
z3 = z3 >> 16;
z11 = tmp7 + z3; /* 相位5 */
z13 = tmp7 - z3;
dataptr[40] = z13 + z2; /* 相位6 */
dataptr[24] = z13 - z2;
dataptr[8] = z11 + z4;
dataptr[56] = z11 - z4;
++dataptr; /* 將指針指向下一列 */
}
dataptr = array;
for(ctr=0;ctr<64;ctr++) dataptr[ctr]=dataptr[ctr]>>3;}
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