コード例 #1
0
        public static void IDCT8x4_LeftPart(ref Block8x8F s, ref Block8x8F d)
        {
            Vector4 my1 = s.V1L;
            Vector4 my7 = s.V7L;
            Vector4 mz0 = my1 + my7;

            Vector4 my3 = s.V3L;
            Vector4 mz2 = my3 + my7;
            Vector4 my5 = s.V5L;
            Vector4 mz1 = my3 + my5;
            Vector4 mz3 = my1 + my5;

            Vector4 mz4 = (mz0 + mz1) * C_1_175876;

            mz2 = (mz2 * C_1_961571) + mz4;
            mz3 = (mz3 * C_0_390181) + mz4;
            mz0 = mz0 * C_0_899976;
            mz1 = mz1 * C_2_562915;

            Vector4 mb3 = (my7 * C_0_298631) + mz0 + mz2;
            Vector4 mb2 = (my5 * C_2_053120) + mz1 + mz3;
            Vector4 mb1 = (my3 * C_3_072711) + mz1 + mz2;
            Vector4 mb0 = (my1 * C_1_501321) + mz0 + mz3;

            Vector4 my2 = s.V2L;
            Vector4 my6 = s.V6L;

            mz4 = (my2 + my6) * C_0_541196;
            Vector4 my0 = s.V0L;
            Vector4 my4 = s.V4L;

            mz0 = my0 + my4;
            mz1 = my0 - my4;

            mz2 = mz4 + (my6 * C_1_847759);
            mz3 = mz4 + (my2 * C_0_765367);

            my0 = mz0 + mz3;
            my3 = mz0 - mz3;
            my1 = mz1 + mz2;
            my2 = mz1 - mz2;

            d.V0L = my0 + mb0;
            d.V7L = my0 - mb0;
            d.V1L = my1 + mb1;
            d.V6L = my1 - mb1;
            d.V2L = my2 + mb2;
            d.V5L = my2 - mb2;
            d.V3L = my3 + mb3;
            d.V4L = my3 - mb3;
        }
コード例 #2
0
        /// <summary>
        /// Apply floating point IDCT transformation into dest, using a temporary block 'temp' provided by the caller (optimization).
        /// Ported from https://github.com/norishigefukushima/dct_simd/blob/master/dct/dct8x8_simd.cpp#L239
        /// </summary>
        /// <param name="src">Source</param>
        /// <param name="dest">Destination</param>
        /// <param name="temp">Temporary block provided by the caller</param>
        public static void TransformIDCT(ref Block8x8F src, ref Block8x8F dest, ref Block8x8F temp)
        {
            src.TransposeInto(ref temp);

            IDCT8x4_LeftPart(ref temp, ref dest);
            IDCT8x4_RightPart(ref temp, ref dest);

            dest.TransposeInto(ref temp);

            IDCT8x4_LeftPart(ref temp, ref dest);
            IDCT8x4_RightPart(ref temp, ref dest);

            // TODO: What if we leave the blocks in a scaled-by-x8 state until final color packing?
            dest.MultiplyInPlace(C_0_125);
        }
コード例 #3
0
        /// <summary>
        /// Apply floating point IDCT transformation into dest, using a temporary block 'temp' provided by the caller (optimization)
        /// </summary>
        /// <param name="src">Source</param>
        /// <param name="dest">Destination</param>
        /// <param name="temp">Temporary block provided by the caller</param>
        /// <param name="offsetSourceByNeg128">If true, a constant -128.0 offset is applied for all values before FDCT </param>
        public static void TransformFDCT(
            ref Block8x8F src,
            ref Block8x8F dest,
            ref Block8x8F temp,
            bool offsetSourceByNeg128 = true)
        {
            src.TransposeInto(ref temp);
            if (offsetSourceByNeg128)
            {
                temp.AddInPlace(-128F);
            }

            FDCT8x4_LeftPart(ref temp, ref dest);
            FDCT8x4_RightPart(ref temp, ref dest);

            dest.TransposeInto(ref temp);

            FDCT8x4_LeftPart(ref temp, ref dest);
            FDCT8x4_RightPart(ref temp, ref dest);

            dest.MultiplyInPlace(C_0_125);
        }