plm_video_idct()

void fl::third_party::plm_video_idct

(

int *

block

)

Definition at line 2880 of file pl_mpeg.hpp.

                                            {
    int
        b1, b3, b4, b6, b7, tmp1, tmp2, m0,
        x0, x1, x2, x3, x4, y3, y4, y5, y6, y7;
 
    // Transform columns
    for (int i = 0; i < 8; ++i) {
        b1 = block[4 * 8 + i];
        b3 = block[2 * 8 + i] + block[6 * 8 + i];
        b4 = block[5 * 8 + i] - block[3 * 8 + i];
        tmp1 = block[1 * 8 + i] + block[7 * 8 + i];
        tmp2 = block[3 * 8 + i] + block[5 * 8 + i];
        b6 = block[1 * 8 + i] - block[7 * 8 + i];
        b7 = tmp1 + tmp2;
        m0 = block[0 * 8 + i];
        x4 = ((b6 * 473 - b4 * 196 + 128) >> 8) - b7;
        x0 = x4 - (((tmp1 - tmp2) * 362 + 128) >> 8);
        x1 = m0 - b1;
        x2 = (((block[2 * 8 + i] - block[6 * 8 + i]) * 362 + 128) >> 8) - b3;
        x3 = m0 + b1;
        y3 = x1 + x2;
        y4 = x3 + b3;
        y5 = x1 - x2;
        y6 = x3 - b3;
        y7 = -x0 - ((b4 * 473 + b6 * 196 + 128) >> 8);
        block[0 * 8 + i] = b7 + y4;
        block[1 * 8 + i] = x4 + y3;
        block[2 * 8 + i] = y5 - x0;
        block[3 * 8 + i] = y6 - y7;
        block[4 * 8 + i] = y6 + y7;
        block[5 * 8 + i] = x0 + y5;
        block[6 * 8 + i] = y3 - x4;
        block[7 * 8 + i] = y4 - b7;
    }
 
    // Transform rows
    for (int i = 0; i < 64; i += 8) {
        b1 = block[4 + i];
        b3 = block[2 + i] + block[6 + i];
        b4 = block[5 + i] - block[3 + i];
        tmp1 = block[1 + i] + block[7 + i];
        tmp2 = block[3 + i] + block[5 + i];
        b6 = block[1 + i] - block[7 + i];
        b7 = tmp1 + tmp2;
        m0 = block[0 + i];
        x4 = ((b6 * 473 - b4 * 196 + 128) >> 8) - b7;
        x0 = x4 - (((tmp1 - tmp2) * 362 + 128) >> 8);
        x1 = m0 - b1;
        x2 = (((block[2 + i] - block[6 + i]) * 362 + 128) >> 8) - b3;
        x3 = m0 + b1;
        y3 = x1 + x2;
        y4 = x3 + b3;
        y5 = x1 - x2;
        y6 = x3 - b3;
        y7 = -x0 - ((b4 * 473 + b6 * 196 + 128) >> 8);
        block[0 + i] = (b7 + y4 + 128) >> 8;
        block[1 + i] = (x4 + y3 + 128) >> 8;
        block[2 + i] = (y5 - x0 + 128) >> 8;
        block[3 + i] = (y6 - y7 + 128) >> 8;
        block[4 + i] = (y6 + y7 + 128) >> 8;
        block[5 + i] = (x0 + y5 + 128) >> 8;
        block[6 + i] = (y3 - x4 + 128) >> 8;
        block[7 + i] = (y4 - b7 + 128) >> 8;
    }
}

References FL_NOEXCEPT.

Referenced by plm_video_decode_block().

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