Convert 16x16 dct/idct to integer forms
Converted vp9_short_fdct16x16_c and vp9_short_idct16x16_c to integer versions. Change-Id: Ie3ec985a890ac0f4f4f5818e6f0122e00c8af69f
This commit is contained in:
Yunqing Wang
parent
0078d2f3dc
commit
4626faf1e7
@ -1013,6 +1013,8 @@ void vp9_short_idct16x16_c(short *input, short *output, int pitch) {
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}
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#endif
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#define TEST_INT_16x16_IDCT 1
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#if !TEST_INT_16x16_IDCT
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static const double C1 = 0.995184726672197;
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static const double C2 = 0.98078528040323;
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static const double C3 = 0.956940335732209;
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@ -1273,3 +1275,235 @@ void vp9_short_idct16x16_c(short *input, short *output, int pitch) {
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}
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vp9_clear_system_state(); // Make it simd safe : __asm emms;
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}
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#else
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static const int16_t C1 = 16305;
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static const int16_t C2 = 16069;
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static const int16_t C3 = 15679;
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static const int16_t C4 = 15137;
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static const int16_t C5 = 14449;
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static const int16_t C6 = 13623;
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static const int16_t C7 = 12665;
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static const int16_t C8 = 11585;
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static const int16_t C9 = 10394;
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static const int16_t C10 = 9102;
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static const int16_t C11 = 7723;
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static const int16_t C12 = 6270;
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static const int16_t C13 = 4756;
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static const int16_t C14 = 3196;
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static const int16_t C15 = 1606;
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#define INITIAL_SHIFT 2
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#define INITIAL_ROUNDING (1 << (INITIAL_SHIFT - 1))
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#define RIGHT_SHIFT 14
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#define RIGHT_ROUNDING (1 << (RIGHT_SHIFT - 1))
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static void butterfly_16x16_idct_1d(int16_t input[16], int16_t output[16],
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int last_shift_bits) {
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int16_t step[16];
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int intermediate[16];
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int temp1, temp2;
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int step1_shift = RIGHT_SHIFT + INITIAL_SHIFT;
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int step1_rounding = 1 << (step1_shift - 1);
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int last_rounding = 0;
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if (last_shift_bits > 0)
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last_rounding = 1 << (last_shift_bits - 1);
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// step 1 and 2
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step[ 0] = (input[0] + input[8] + INITIAL_ROUNDING) >> INITIAL_SHIFT;
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step[ 1] = (input[0] - input[8] + INITIAL_ROUNDING) >> INITIAL_SHIFT;
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temp1 = input[4] * C12;
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temp2 = input[12] * C4;
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temp1 = (temp1 - temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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temp1 *= C8;
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step[ 2] = (2 * (temp1) + step1_rounding) >> step1_shift;
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temp1 = input[4] * C4;
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temp2 = input[12] * C12;
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temp1 = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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temp1 *= C8;
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step[ 3] = (2 * (temp1) + step1_rounding) >> step1_shift;
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temp1 = input[2] * C8;
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temp1 = (2 * (temp1) + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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temp2 = input[6] + input[10];
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step[ 4] = (temp1 + temp2 + INITIAL_ROUNDING) >> INITIAL_SHIFT;
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step[ 5] = (temp1 - temp2 + INITIAL_ROUNDING) >> INITIAL_SHIFT;
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temp1 = input[14] * C8;
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temp1 = (2 * (temp1) + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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temp2 = input[6] - input[10];
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step[ 6] = (temp2 - temp1 + INITIAL_ROUNDING) >> INITIAL_SHIFT;
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step[ 7] = (temp2 + temp1 + INITIAL_ROUNDING) >> INITIAL_SHIFT;
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// for odd input
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temp1 = input[3] * C12;
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temp2 = input[13] * C4;
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temp1 = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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temp1 *= C8;
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intermediate[ 8] = (2 * (temp1) + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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temp1 = input[3] * C4;
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temp2 = input[13] * C12;
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temp2 = (temp2 - temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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temp2 *= C8;
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intermediate[ 9] = (2 * (temp2) + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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intermediate[10] = (2 * (input[9] * C8) + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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intermediate[11] = input[15] - input[1];
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intermediate[12] = input[15] + input[1];
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intermediate[13] = (2 * (input[7] * C8) + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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temp1 = input[11] * C12;
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temp2 = input[5] * C4;
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temp2 = (temp2 - temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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temp2 *= C8;
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intermediate[14] = (2 * (temp2) + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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temp1 = input[11] * C4;
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temp2 = input[5] * C12;
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temp1 = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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temp1 *= C8;
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intermediate[15] = (2 * (temp1) + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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step[ 8] = (intermediate[ 8] + intermediate[14] + INITIAL_ROUNDING)
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>> INITIAL_SHIFT;
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step[ 9] = (intermediate[ 9] + intermediate[15] + INITIAL_ROUNDING)
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>> INITIAL_SHIFT;
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step[10] = (intermediate[10] + intermediate[11] + INITIAL_ROUNDING)
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>> INITIAL_SHIFT;
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step[11] = (intermediate[10] - intermediate[11] + INITIAL_ROUNDING)
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>> INITIAL_SHIFT;
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step[12] = (intermediate[12] + intermediate[13] + INITIAL_ROUNDING)
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>> INITIAL_SHIFT;
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step[13] = (intermediate[12] - intermediate[13] + INITIAL_ROUNDING)
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>> INITIAL_SHIFT;
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step[14] = (intermediate[ 8] - intermediate[14] + INITIAL_ROUNDING)
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>> INITIAL_SHIFT;
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step[15] = (intermediate[ 9] - intermediate[15] + INITIAL_ROUNDING)
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>> INITIAL_SHIFT;
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// step 3
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output[0] = step[ 0] + step[ 3];
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output[1] = step[ 1] + step[ 2];
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output[2] = step[ 1] - step[ 2];
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output[3] = step[ 0] - step[ 3];
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temp1 = step[ 4] * C14;
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temp2 = step[ 7] * C2;
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output[4] = (temp1 - temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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temp1 = step[ 4] * C2;
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temp2 = step[ 7] * C14;
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output[7] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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temp1 = step[ 5] * C10;
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temp2 = step[ 6] * C6;
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output[5] = (temp1 - temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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temp1 = step[ 5] * C6;
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temp2 = step[ 6] * C10;
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output[6] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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output[8] = step[ 8] + step[11];
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output[9] = step[ 9] + step[10];
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output[10] = step[ 9] - step[10];
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output[11] = step[ 8] - step[11];
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output[12] = step[12] + step[15];
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output[13] = step[13] + step[14];
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output[14] = step[13] - step[14];
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output[15] = step[12] - step[15];
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// output 4
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step[ 0] = output[0] + output[7];
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step[ 1] = output[1] + output[6];
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step[ 2] = output[2] + output[5];
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step[ 3] = output[3] + output[4];
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step[ 4] = output[3] - output[4];
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step[ 5] = output[2] - output[5];
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step[ 6] = output[1] - output[6];
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step[ 7] = output[0] - output[7];
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temp1 = output[8] * C7;
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temp2 = output[15] * C9;
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step[ 8] = (temp1 - temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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temp1 = output[9] * C11;
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temp2 = output[14] * C5;
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step[ 9] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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temp1 = output[10] * C3;
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temp2 = output[13] * C13;
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step[10] = (temp1 - temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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temp1 = output[11] * C15;
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temp2 = output[12] * C1;
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step[11] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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temp1 = output[11] * C1;
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temp2 = output[12] * C15;
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step[12] = (temp2 - temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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temp1 = output[10] * C13;
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temp2 = output[13] * C3;
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step[13] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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temp1 = output[9] * C5;
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temp2 = output[14] * C11;
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step[14] = (temp2 - temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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temp1 = output[8] * C9;
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temp2 = output[15] * C7;
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step[15] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
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// step 5
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output[0] = (step[0] + step[15] + last_rounding) >> last_shift_bits;
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output[1] = (step[1] + step[14] + last_rounding) >> last_shift_bits;
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output[2] = (step[2] + step[13] + last_rounding) >> last_shift_bits;
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output[3] = (step[3] + step[12] + last_rounding) >> last_shift_bits;
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output[4] = (step[4] + step[11] + last_rounding) >> last_shift_bits;
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output[5] = (step[5] + step[10] + last_rounding) >> last_shift_bits;
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output[6] = (step[6] + step[ 9] + last_rounding) >> last_shift_bits;
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output[7] = (step[7] + step[ 8] + last_rounding) >> last_shift_bits;
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output[15] = (step[0] - step[15] + last_rounding) >> last_shift_bits;
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output[14] = (step[1] - step[14] + last_rounding) >> last_shift_bits;
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output[13] = (step[2] - step[13] + last_rounding) >> last_shift_bits;
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output[12] = (step[3] - step[12] + last_rounding) >> last_shift_bits;
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output[11] = (step[4] - step[11] + last_rounding) >> last_shift_bits;
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output[10] = (step[5] - step[10] + last_rounding) >> last_shift_bits;
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output[9] = (step[6] - step[ 9] + last_rounding) >> last_shift_bits;
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output[8] = (step[7] - step[ 8] + last_rounding) >> last_shift_bits;
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}
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void vp9_short_idct16x16_c(int16_t *input, int16_t *output, int pitch) {
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int16_t out[16 * 16];
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int16_t *outptr = &out[0];
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const int short_pitch = pitch >> 1;
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int i, j;
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int16_t temp_in[16], temp_out[16];
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// First transform rows
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for (i = 0; i < 16; ++i) {
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butterfly_16x16_idct_1d(input, outptr, 0);
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input += short_pitch;
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outptr += 16;
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}
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// Then transform columns
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for (i = 0; i < 16; ++i) {
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for (j = 0; j < 16; ++j)
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temp_in[j] = out[j * 16 + i];
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butterfly_16x16_idct_1d(temp_in, temp_out, 3);
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for (j = 0; j < 16; ++j)
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output[j * 16 + i] = temp_out[j];
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}
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}
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#undef INITIAL_SHIFT
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#undef INITIAL_ROUNDING
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#undef RIGHT_SHIFT
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#undef RIGHT_ROUNDING
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#endif
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@ -901,6 +901,8 @@ void vp9_short_walsh8x4_x8_c(short *input, short *output, int pitch) {
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}
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#endif
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#define TEST_INT_16x16_DCT 1
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#if !TEST_INT_16x16_DCT
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static const double C1 = 0.995184726672197;
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static const double C2 = 0.98078528040323;
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static const double C3 = 0.956940335732209;
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@ -1107,3 +1109,225 @@ void vp9_short_fdct16x16_c(short *input, short *out, int pitch) {
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}
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vp9_clear_system_state(); // Make it simd safe : __asm emms;
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}
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#else
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static const int16_t C1 = 16305;
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static const int16_t C2 = 16069;
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static const int16_t C3 = 15679;
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static const int16_t C4 = 15137;
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static const int16_t C5 = 14449;
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static const int16_t C6 = 13623;
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static const int16_t C7 = 12665;
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static const int16_t C8 = 11585;
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static const int16_t C9 = 10394;
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static const int16_t C10 = 9102;
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static const int16_t C11 = 7723;
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static const int16_t C12 = 6270;
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static const int16_t C13 = 4756;
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static const int16_t C14 = 3196;
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static const int16_t C15 = 1606;
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#define RIGHT_SHIFT 14
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#define ROUNDING (1 << (RIGHT_SHIFT - 1))
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static void dct16x16_1d(int16_t input[16], int16_t output[16],
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int last_shift_bits) {
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int16_t step[16];
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int intermediate[16];
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int temp1, temp2;
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int final_shift = RIGHT_SHIFT;
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int final_rounding = ROUNDING;
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int output_shift = 0;
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int output_rounding = 0;
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final_shift += last_shift_bits;
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if (final_shift > 0)
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final_rounding = 1 << (final_shift - 1);
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output_shift += last_shift_bits;
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if (output_shift > 0)
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output_rounding = 1 << (output_shift - 1);
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// step 1
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step[ 0] = input[0] + input[15];
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step[ 1] = input[1] + input[14];
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step[ 2] = input[2] + input[13];
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step[ 3] = input[3] + input[12];
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step[ 4] = input[4] + input[11];
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step[ 5] = input[5] + input[10];
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step[ 6] = input[6] + input[ 9];
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step[ 7] = input[7] + input[ 8];
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step[ 8] = input[7] - input[ 8];
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step[ 9] = input[6] - input[ 9];
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step[10] = input[5] - input[10];
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step[11] = input[4] - input[11];
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step[12] = input[3] - input[12];
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step[13] = input[2] - input[13];
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step[14] = input[1] - input[14];
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step[15] = input[0] - input[15];
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// step 2
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output[0] = step[0] + step[7];
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output[1] = step[1] + step[6];
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output[2] = step[2] + step[5];
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output[3] = step[3] + step[4];
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output[4] = step[3] - step[4];
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output[5] = step[2] - step[5];
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output[6] = step[1] - step[6];
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output[7] = step[0] - step[7];
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temp1 = step[ 8] * C7;
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temp2 = step[15] * C9;
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output[ 8] = (temp1 + temp2 + ROUNDING) >> RIGHT_SHIFT;
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temp1 = step[ 9] * C11;
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temp2 = step[14] * C5;
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output[ 9] = (temp1 - temp2 + ROUNDING) >> RIGHT_SHIFT;
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temp1 = step[10] * C3;
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temp2 = step[13] * C13;
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output[10] = (temp1 + temp2 + ROUNDING) >> RIGHT_SHIFT;
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temp1 = step[11] * C15;
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temp2 = step[12] * C1;
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output[11] = (temp1 - temp2 + ROUNDING) >> RIGHT_SHIFT;
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temp1 = step[11] * C1;
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temp2 = step[12] * C15;
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output[12] = (temp2 + temp1 + ROUNDING) >> RIGHT_SHIFT;
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temp1 = step[10] * C13;
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temp2 = step[13] * C3;
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output[13] = (temp2 - temp1 + ROUNDING) >> RIGHT_SHIFT;
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temp1 = step[ 9] * C5;
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temp2 = step[14] * C11;
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output[14] = (temp2 + temp1 + ROUNDING) >> RIGHT_SHIFT;
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temp1 = step[ 8] * C9;
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temp2 = step[15] * C7;
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output[15] = (temp2 - temp1 + ROUNDING) >> RIGHT_SHIFT;
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// step 3
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step[ 0] = output[0] + output[3];
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step[ 1] = output[1] + output[2];
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step[ 2] = output[1] - output[2];
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step[ 3] = output[0] - output[3];
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temp1 = output[4] * C14;
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temp2 = output[7] * C2;
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step[ 4] = (temp1 + temp2 + ROUNDING) >> RIGHT_SHIFT;
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temp1 = output[5] * C10;
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temp2 = output[6] * C6;
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step[ 5] = (temp1 + temp2 + ROUNDING) >> RIGHT_SHIFT;
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temp1 = output[5] * C6;
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temp2 = output[6] * C10;
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step[ 6] = (temp2 - temp1 + ROUNDING) >> RIGHT_SHIFT;
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temp1 = output[4] * C2;
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temp2 = output[7] * C14;
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step[ 7] = (temp2 - temp1 + ROUNDING) >> RIGHT_SHIFT;
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step[ 8] = output[ 8] + output[11];
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step[ 9] = output[ 9] + output[10];
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step[10] = output[ 9] - output[10];
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step[11] = output[ 8] - output[11];
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step[12] = output[12] + output[15];
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step[13] = output[13] + output[14];
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step[14] = output[13] - output[14];
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step[15] = output[12] - output[15];
|
||||
|
||||
// step 4
|
||||
output[ 0] = (step[ 0] + step[ 1] + output_rounding) >> output_shift;
|
||||
output[ 8] = (step[ 0] - step[ 1] + output_rounding) >> output_shift;
|
||||
|
||||
temp1 = step[2] * C12;
|
||||
temp2 = step[3] * C4;
|
||||
temp1 = (temp1 + temp2 + final_rounding) >> final_shift;
|
||||
output[ 4] = (2 * (temp1 * C8) + ROUNDING) >> RIGHT_SHIFT;
|
||||
|
||||
temp1 = step[2] * C4;
|
||||
temp2 = step[3] * C12;
|
||||
temp1 = (temp2 - temp1 + final_rounding) >> final_shift;
|
||||
output[12] = (2 * (temp1 * C8) + ROUNDING) >> RIGHT_SHIFT;
|
||||
|
||||
output[ 2] = (2 * ((step[4] + step[ 5]) * C8) + final_rounding)
|
||||
>> final_shift;
|
||||
output[14] = (2 * ((step[7] - step[ 6]) * C8) + final_rounding)
|
||||
>> final_shift;
|
||||
|
||||
temp1 = step[4] - step[5];
|
||||
temp2 = step[6] + step[7];
|
||||
output[ 6] = (temp1 + temp2 + output_rounding) >> output_shift;
|
||||
output[10] = (temp1 - temp2 + output_rounding) >> output_shift;
|
||||
|
||||
intermediate[8] = step[8] + step[14];
|
||||
intermediate[9] = step[9] + step[15];
|
||||
|
||||
temp1 = intermediate[8] * C12;
|
||||
temp2 = intermediate[9] * C4;
|
||||
temp1 = (temp1 - temp2 + final_rounding) >> final_shift;
|
||||
output[3] = (2 * (temp1 * C8) + ROUNDING) >> RIGHT_SHIFT;
|
||||
|
||||
temp1 = intermediate[8] * C4;
|
||||
temp2 = intermediate[9] * C12;
|
||||
temp1 = (temp2 + temp1 + final_rounding) >> final_shift;
|
||||
output[13] = (2 * (temp1 * C8) + ROUNDING) >> RIGHT_SHIFT;
|
||||
|
||||
output[ 9] = (2 * ((step[10] + step[11]) * C8) + final_rounding)
|
||||
>> final_shift;
|
||||
|
||||
intermediate[11] = step[10] - step[11];
|
||||
intermediate[12] = step[12] + step[13];
|
||||
intermediate[13] = step[12] - step[13];
|
||||
intermediate[14] = step[ 8] - step[14];
|
||||
intermediate[15] = step[ 9] - step[15];
|
||||
|
||||
output[15] = (intermediate[11] + intermediate[12] + output_rounding)
|
||||
>> output_shift;
|
||||
output[ 1] = -(intermediate[11] - intermediate[12] + output_rounding)
|
||||
>> output_shift;
|
||||
|
||||
output[ 7] = (2 * (intermediate[13] * C8) + final_rounding) >> final_shift;
|
||||
|
||||
temp1 = intermediate[14] * C12;
|
||||
temp2 = intermediate[15] * C4;
|
||||
temp1 = (temp1 - temp2 + final_rounding) >> final_shift;
|
||||
output[11] = (-2 * (temp1 * C8) + ROUNDING) >> RIGHT_SHIFT;
|
||||
|
||||
temp1 = intermediate[14] * C4;
|
||||
temp2 = intermediate[15] * C12;
|
||||
temp1 = (temp2 + temp1 + final_rounding) >> final_shift;
|
||||
output[ 5] = (2 * (temp1 * C8) + ROUNDING) >> RIGHT_SHIFT;
|
||||
}
|
||||
|
||||
void vp9_short_fdct16x16_c(int16_t *input, int16_t *out, int pitch) {
|
||||
int shortpitch = pitch >> 1;
|
||||
int i, j;
|
||||
int16_t output[256];
|
||||
int16_t *outptr = &output[0];
|
||||
|
||||
// First transform columns
|
||||
for (i = 0; i < 16; i++) {
|
||||
int16_t temp_in[16];
|
||||
int16_t temp_out[16];
|
||||
for (j = 0; j < 16; j++)
|
||||
temp_in[j] = input[j * shortpitch + i];
|
||||
dct16x16_1d(temp_in, temp_out, 0);
|
||||
for (j = 0; j < 16; j++)
|
||||
output[j * 16 + i] = temp_out[j];
|
||||
}
|
||||
|
||||
// Then transform rows
|
||||
for (i = 0; i < 16; ++i) {
|
||||
dct16x16_1d(outptr, out, 1);
|
||||
outptr += 16;
|
||||
out += 16;
|
||||
}
|
||||
}
|
||||
#undef RIGHT_SHIFT
|
||||
#undef ROUNDING
|
||||
#endif
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user