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rgb_to_nv12.cl
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#define RGB_TO_Y(r, g, b) ((((mul24(b, 13) + mul24(g, 65) + mul24(r, 33)) + 64) >> 7) + 16)
#define RGB_TO_U(r, g, b) ((mul24(b, 56) - mul24(g, 37) - mul24(r, 19) + 0x8080) >> 8)
#define RGB_TO_V(r, g, b) ((mul24(r, 56) - mul24(g, 47) - mul24(b, 9) + 0x8080) >> 8)
#define AVERAGE(x, y, z, w) ((convert_ushort(x) + convert_ushort(y) + convert_ushort(z) + convert_ushort(w) + 1) >> 1)
inline void convert_2_ys(__global uchar * out_yuv, int yi, const uchar8 rgbs1) {
uchar2 yy = (uchar2)(
RGB_TO_Y(rgbs1.s2, rgbs1.s1, rgbs1.s0),
RGB_TO_Y(rgbs1.s5, rgbs1.s4, rgbs1.s3)
);
#ifdef CL_DEBUG
if(yi >= RGB_SIZE)
printf("Y vector2 overflow, %d > %d\n", yi, RGB_SIZE);
#endif
vstore2(yy, 0, out_yuv + yi);
}
inline void convert_4_ys(__global uchar * out_yuv, int yi, const uchar8 rgbs1, const uchar8 rgbs3) {
const uchar4 yy = (uchar4)(
RGB_TO_Y(rgbs1.s2, rgbs1.s1, rgbs1.s0),
RGB_TO_Y(rgbs1.s5, rgbs1.s4, rgbs1.s3),
RGB_TO_Y(rgbs3.s0, rgbs1.s7, rgbs1.s6),
RGB_TO_Y(rgbs3.s3, rgbs3.s2, rgbs3.s1)
);
#ifdef CL_DEBUG
if(yi > RGB_SIZE - 4)
printf("Y vector4 overflow, %d > %d\n", yi, RGB_SIZE - 4);
#endif
vstore4(yy, 0, out_yuv + yi);
}
inline void convert_uv(__global uchar * out_yuv, int uvi,
const uchar8 rgbs1, const uchar8 rgbs2) {
// U & V: average of 2x2 pixels square
const short ab = AVERAGE(rgbs1.s0, rgbs1.s3, rgbs2.s0, rgbs2.s3);
const short ag = AVERAGE(rgbs1.s1, rgbs1.s4, rgbs2.s1, rgbs2.s4);
const short ar = AVERAGE(rgbs1.s2, rgbs1.s5, rgbs2.s2, rgbs2.s5);
#ifdef CL_DEBUG
if(uvi >= RGB_SIZE + RGB_SIZE / 2)
printf("UV overflow, %d >= %d\n", uvi, RGB_SIZE + RGB_SIZE / 2);
#endif
out_yuv[uvi] = RGB_TO_U(ar, ag, ab);
out_yuv[uvi+1] = RGB_TO_V(ar, ag, ab);
}
inline void convert_2_uvs(__global uchar * out_yuv, int uvi,
const uchar8 rgbs1, const uchar8 rgbs2, const uchar8 rgbs3, const uchar8 rgbs4) {
// U & V: average of 2x2 pixels square
const short ab1 = AVERAGE(rgbs1.s0, rgbs1.s3, rgbs2.s0, rgbs2.s3);
const short ag1 = AVERAGE(rgbs1.s1, rgbs1.s4, rgbs2.s1, rgbs2.s4);
const short ar1 = AVERAGE(rgbs1.s2, rgbs1.s5, rgbs2.s2, rgbs2.s5);
const short ab2 = AVERAGE(rgbs1.s6, rgbs3.s1, rgbs2.s6, rgbs4.s1);
const short ag2 = AVERAGE(rgbs1.s7, rgbs3.s2, rgbs2.s7, rgbs4.s2);
const short ar2 = AVERAGE(rgbs3.s0, rgbs3.s3, rgbs4.s0, rgbs4.s3);
uchar4 uv = (uchar4)(
RGB_TO_U(ar1, ag1, ab1),
RGB_TO_V(ar1, ag1, ab1),
RGB_TO_U(ar2, ag2, ab2),
RGB_TO_V(ar2, ag2, ab2)
);
#ifdef CL_DEBUG1
if(uvi > RGB_SIZE + RGB_SIZE / 2 - 4)
printf("UV2 overflow, %d >= %d\n", uvi, RGB_SIZE + RGB_SIZE / 2 - 2);
#endif
vstore4(uv, 0, out_yuv + uvi);
}
__kernel void rgb_to_nv12(__global uchar const * const rgb,
__global uchar * out_yuv)
{
const int dx = get_global_id(0);
const int dy = get_global_id(1);
const int col = mul24(dx, 4); // Current column in rgb image
const int row = mul24(dy, 4); // Current row in rgb image
const int bgri_start = mad24(row, RGB_STRIDE, mul24(col, 3)); // Start offset of rgb data being converted
const int yi_start = mad24(row, WIDTH, col); // Start offset in the target yuv buffer
int uvi = mad24(row / 2, WIDTH, RGB_SIZE + col);
int num_col = min(WIDTH - col, 4);
int num_row = min(HEIGHT - row, 4);
if(num_row == 4) {
const uchar8 rgbs0_0 = vload8(0, rgb + bgri_start);
const uchar8 rgbs0_1 = vload8(0, rgb + bgri_start + 8);
const uchar8 rgbs1_0 = vload8(0, rgb + bgri_start + RGB_STRIDE);
const uchar8 rgbs1_1 = vload8(0, rgb + bgri_start + RGB_STRIDE + 8);
const uchar8 rgbs2_0 = vload8(0, rgb + bgri_start + RGB_STRIDE * 2);
const uchar8 rgbs2_1 = vload8(0, rgb + bgri_start + RGB_STRIDE * 2 + 8);
const uchar8 rgbs3_0 = vload8(0, rgb + bgri_start + RGB_STRIDE * 3);
const uchar8 rgbs3_1 = vload8(0, rgb + bgri_start + RGB_STRIDE * 3 + 8);
if(num_col == 4) {
convert_4_ys(out_yuv, yi_start, rgbs0_0, rgbs0_1);
convert_4_ys(out_yuv, yi_start + WIDTH, rgbs1_0, rgbs1_1);
convert_4_ys(out_yuv, yi_start + WIDTH * 2, rgbs2_0, rgbs2_1);
convert_4_ys(out_yuv, yi_start + WIDTH * 3, rgbs3_0, rgbs3_1);
convert_2_uvs(out_yuv, uvi, rgbs0_0, rgbs1_0, rgbs0_1, rgbs1_1);
convert_2_uvs(out_yuv, uvi + WIDTH, rgbs2_0, rgbs3_0, rgbs2_1, rgbs3_1);
} else if(num_col == 2) {
convert_2_ys(out_yuv, yi_start, rgbs0_0);
convert_2_ys(out_yuv, yi_start + WIDTH, rgbs1_0);
convert_2_ys(out_yuv, yi_start + WIDTH * 2, rgbs2_0);
convert_2_ys(out_yuv, yi_start + WIDTH * 3, rgbs3_0);
convert_uv(out_yuv, uvi, rgbs0_0, rgbs1_0);
convert_uv(out_yuv, uvi + WIDTH, rgbs2_0, rgbs3_0);
}
} else {
const uchar8 rgbs0_0 = vload8(0, rgb + bgri_start);
const uchar8 rgbs0_1 = vload8(0, rgb + bgri_start + 8);
const uchar8 rgbs1_0 = vload8(0, rgb + bgri_start + RGB_STRIDE);
const uchar8 rgbs1_1 = vload8(0, rgb + bgri_start + RGB_STRIDE + 8);
if(num_col == 4) {
convert_4_ys(out_yuv, yi_start, rgbs0_0, rgbs0_1);
convert_4_ys(out_yuv, yi_start + WIDTH, rgbs1_0, rgbs1_1);
convert_2_uvs(out_yuv, uvi, rgbs0_0, rgbs1_0, rgbs0_1, rgbs1_1);
} else if(num_col == 2) {
convert_2_ys(out_yuv, yi_start, rgbs0_0);
convert_2_ys(out_yuv, yi_start + WIDTH, rgbs1_0);
convert_uv(out_yuv, uvi, rgbs0_0, rgbs1_0);
}
}
}