ref: 048b9d41a6718e5b491dc9dd3fbaa9939fa07cb5
dir: /vp9/common/vp9_idctllm.c/
/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
/****************************************************************************
* Notes:
*
* This implementation makes use of 16 bit fixed point verio of two multiply
* constants:
* 1. sqrt(2) * cos (pi/8)
* 2. sqrt(2) * sin (pi/8)
* Becuase the first constant is bigger than 1, to maintain the same 16 bit
* fixed point precision as the second one, we use a trick of
* x * a = x + x*(a-1)
* so
* x * sqrt(2) * cos (pi/8) = x + x * (sqrt(2) *cos(pi/8)-1).
**************************************************************************/
#include <assert.h>
#include <math.h>
#include "./vpx_config.h"
#include "vp9/common/vp9_systemdependent.h"
#include "vp9/common/vp9_blockd.h"
#include "vp9/common/vp9_common.h"
#include "vp9/common/vp9_idct.h"
static const int16_t idct_i4[16] = {
8192, 10703, 8192, 4433,
8192, 4433, -8192, -10703,
8192, -4433, -8192, 10703,
8192, -10703, 8192, -4433
};
static const int16_t iadst_i4[16] = {
3736, 9459, 10757, 7021,
7021, 9459, -3736, -10757,
9459, 0, -9459, 9459,
10757, -9459, 7021, -3736
};
static const int16_t idct_i8[64] = {
5793, 8035, 7568, 6811,
5793, 4551, 3135, 1598,
5793, 6811, 3135, -1598,
-5793, -8035, -7568, -4551,
5793, 4551, -3135, -8035,
-5793, 1598, 7568, 6811,
5793, 1598, -7568, -4551,
5793, 6811, -3135, -8035,
5793, -1598, -7568, 4551,
5793, -6811, -3135, 8035,
5793, -4551, -3135, 8035,
-5793, -1598, 7568, -6811,
5793, -6811, 3135, 1598,
-5793, 8035, -7568, 4551,
5793, -8035, 7568, -6811,
5793, -4551, 3135, -1598
};
static const int16_t iadst_i8[64] = {
1460, 4184, 6342, 7644,
7914, 7114, 5354, 2871,
2871, 7114, 7644, 4184,
-1460, -6342, -7914, -5354,
4184, 7914, 2871, -5354,
-7644, -1460, 6342, 7114,
5354, 6342, -4184, -7114,
2871, 7644, -1460, -7914,
6342, 2871, -7914, 1460,
7114, -5354, -4184, 7644,
7114, -1460, -5354, 7914,
-4184, -2871, 7644, -6342,
7644, -5354, 1460, 2871,
-6342, 7914, -7114, 4184,
7914, -7644, 7114, -6342,
5354, -4184, 2871, -1460
};
static const int16_t idct_i16[256] = {
4096, 5765, 5681, 5543, 5352, 5109, 4816, 4478,
4096, 3675, 3218, 2731, 2217, 1682, 1130, 568,
4096, 5543, 4816, 3675, 2217, 568, -1130, -2731,
-4096, -5109, -5681, -5765, -5352, -4478, -3218, -1682,
4096, 5109, 3218, 568, -2217, -4478, -5681, -5543,
-4096, -1682, 1130, 3675, 5352, 5765, 4816, 2731,
4096, 4478, 1130, -2731, -5352, -5543, -3218, 568,
4096, 5765, 4816, 1682, -2217, -5109, -5681, -3675,
4096, 3675, -1130, -5109, -5352, -1682, 3218, 5765,
4096, -568, -4816, -5543, -2217, 2731, 5681, 4478,
4096, 2731, -3218, -5765, -2217, 3675, 5681, 1682,
-4096, -5543, -1130, 4478, 5352, 568, -4816, -5109,
4096, 1682, -4816, -4478, 2217, 5765, 1130, -5109,
-4096, 2731, 5681, 568, -5352, -3675, 3218, 5543,
4096, 568, -5681, -1682, 5352, 2731, -4816, -3675,
4096, 4478, -3218, -5109, 2217, 5543, -1130, -5765,
4096, -568, -5681, 1682, 5352, -2731, -4816, 3675,
4096, -4478, -3218, 5109, 2217, -5543, -1130, 5765,
4096, -1682, -4816, 4478, 2217, -5765, 1130, 5109,
-4096, -2731, 5681, -568, -5352, 3675, 3218, -5543,
4096, -2731, -3218, 5765, -2217, -3675, 5681, -1682,
-4096, 5543, -1130, -4478, 5352, -568, -4816, 5109,
4096, -3675, -1130, 5109, -5352, 1682, 3218, -5765,
4096, 568, -4816, 5543, -2217, -2731, 5681, -4478,
4096, -4478, 1130, 2731, -5352, 5543, -3218, -568,
4096, -5765, 4816, -1682, -2217, 5109, -5681, 3675,
4096, -5109, 3218, -568, -2217, 4478, -5681, 5543,
-4096, 1682, 1130, -3675, 5352, -5765, 4816, -2731,
4096, -5543, 4816, -3675, 2217, -568, -1130, 2731,
-4096, 5109, -5681, 5765, -5352, 4478, -3218, 1682,
4096, -5765, 5681, -5543, 5352, -5109, 4816, -4478,
4096, -3675, 3218, -2731, 2217, -1682, 1130, -568
};
#if CONFIG_INTHT
static const int16_t iadst_i16[256] = {
284, 850, 1407, 1951, 2476, 2977, 3450, 3889,
4291, 4652, 4967, 5235, 5453, 5618, 5729, 5784,
850, 2476, 3889, 4967, 5618, 5784, 5453, 4652,
3450, 1951, 284, -1407, -2977, -4291, -5235, -5729,
1407, 3889, 5453, 5729, 4652, 2476, -284, -2977,
-4967, -5784, -5235, -3450, -850, 1951, 4291, 5618,
1951, 4967, 5729, 3889, 284, -3450, -5618, -5235,
-2476, 1407, 4652, 5784, 4291, 850, -2977, -5453,
2476, 5618, 4652, 284, -4291, -5729, -2977, 1951,
5453, 4967, 850, -3889, -5784, -3450, 1407, 5235,
2977, 5784, 2476, -3450, -5729, -1951, 3889, 5618,
1407, -4291, -5453, -850, 4652, 5235, 284, -4967,
3450, 5453, -284, -5618, -2977, 3889, 5235, -850,
-5729, -2476, 4291, 4967, -1407, -5784, -1951, 4652,
3889, 4652, -2977, -5235, 1951, 5618, -850, -5784,
-284, 5729, 1407, -5453, -2476, 4967, 3450, -4291,
4291, 3450, -4967, -2476, 5453, 1407, -5729, -284,
5784, -850, -5618, 1951, 5235, -2977, -4652, 3889,
4652, 1951, -5784, 1407, 4967, -4291, -2476, 5729,
-850, -5235, 3889, 2977, -5618, 284, 5453, -3450,
4967, 284, -5235, 4652, 850, -5453, 4291, 1407,
-5618, 3889, 1951, -5729, 3450, 2476, -5784, 2977,
5235, -1407, -3450, 5784, -3889, -850, 4967, -5453,
1951, 2977, -5729, 4291, 284, -4652, 5618, -2476,
5453, -2977, -850, 4291, -5784, 4652, -1407, -2476,
5235, -5618, 3450, 284, -3889, 5729, -4967, 1951,
5618, -4291, 1951, 850, -3450, 5235, -5784, 4967,
-2977, 284, 2476, -4652, 5729, -5453, 3889, -1407,
5729, -5235, 4291, -2977, 1407, 284, -1951, 3450,
-4652, 5453, -5784, 5618, -4967, 3889, -2476, 850,
5784, -5729, 5618, -5453, 5235, -4967, 4652, -4291,
3889, -3450, 2977, -2476, 1951, -1407, 850, -284
};
#else
static const int16_t iadst_i16[256] = {
542, 1607, 2614, 3526, 4311, 4940, 5390, 5646,
5698, 5543, 5189, 4646, 3936, 3084, 2120, 1080,
1080, 3084, 4646, 5543, 5646, 4940, 3526, 1607,
-542, -2614, -4311, -5390, -5698, -5189, -3936, -2120,
1607, 4311, 5646, 5189, 3084, 0, -3084, -5189,
-5646, -4311, -1607, 1607, 4311, 5646, 5189, 3084,
2120, 5189, 5390, 2614, -1607, -4940, -5543, -3084,
1080, 4646, 5646, 3526, -542, -4311, -5698, -3936,
2614, 5646, 3936, -1080, -5189, -4940, -542, 4311,
5543, 2120, -3084, -5698, -3526, 1607, 5390, 4646,
3084, 5646, 1607, -4311, -5189, 0, 5189, 4311,
-1607, -5646, -3084, 3084, 5646, 1607, -4311, -5189,
3526, 5189, -1080, -5698, -1607, 4940, 3936, -3084,
-5390, 542, 5646, 2120, -4646, -4311, 2614, 5543,
3936, 4311, -3526, -4646, 3084, 4940, -2614, -5189,
2120, 5390, -1607, -5543, 1080, 5646, -542, -5698,
4311, 3084, -5189, -1607, 5646, 0, -5646, 1607,
5189, -3084, -4311, 4311, 3084, -5189, -1607, 5646,
4646, 1607, -5698, 2120, 4311, -4940, -1080, 5646,
-2614, -3936, 5189, 542, -5543, 3084, 3526, -5390,
4940, 0, -4940, 4940, 0, -4940, 4940, 0,
-4940, 4940, 0, -4940, 4940, 0, -4940, 4940,
5189, -1607, -3084, 5646, -4311, 0, 4311, -5646,
3084, 1607, -5189, 5189, -1607, -3084, 5646, -4311,
5390, -3084, -542, 3936, -5646, 4940, -2120, -1607,
4646, -5698, 4311, -1080, -2614, 5189, -5543, 3526,
5543, -4311, 2120, 542, -3084, 4940, -5698, 5189,
-3526, 1080, 1607, -3936, 5390, -5646, 4646, -2614,
5646, -5189, 4311, -3084, 1607, 0, -1607, 3084,
-4311, 5189, -5646, 5646, -5189, 4311, -3084, 1607,
5698, -5646, 5543, -5390, 5189, -4940, 4646, -4311,
3936, -3526, 3084, -2614, 2120, -1607, 1080, -542
};
#endif
/* Converted the transforms to integer form. */
#define HORIZONTAL_SHIFT 14 // 16
#define HORIZONTAL_ROUNDING ((1 << (HORIZONTAL_SHIFT - 1)) - 1)
#define VERTICAL_SHIFT 17 // 15
#define VERTICAL_ROUNDING ((1 << (VERTICAL_SHIFT - 1)) - 1)
void vp9_ihtllm_c(const int16_t *input, int16_t *output, int pitch,
TX_TYPE tx_type, int tx_dim, uint16_t eobs) {
int i, j, k;
int nz_dim;
int16_t imbuf[256];
const int16_t *ip = input;
int16_t *op = output;
int16_t *im = &imbuf[0];
/* pointers to vertical and horizontal transforms. */
const int16_t *ptv = NULL, *pth = NULL;
int shortpitch = pitch >> 1;
switch (tx_type) {
case ADST_ADST :
ptv = pth = (tx_dim == 4) ? &iadst_i4[0]
: ((tx_dim == 8) ? &iadst_i8[0]
: &iadst_i16[0]);
break;
case ADST_DCT :
ptv = (tx_dim == 4) ? &iadst_i4[0]
: ((tx_dim == 8) ? &iadst_i8[0] : &iadst_i16[0]);
pth = (tx_dim == 4) ? &idct_i4[0]
: ((tx_dim == 8) ? &idct_i8[0] : &idct_i16[0]);
break;
case DCT_ADST :
ptv = (tx_dim == 4) ? &idct_i4[0]
: ((tx_dim == 8) ? &idct_i8[0] : &idct_i16[0]);
pth = (tx_dim == 4) ? &iadst_i4[0]
: ((tx_dim == 8) ? &iadst_i8[0] : &iadst_i16[0]);
break;
case DCT_DCT :
ptv = pth = (tx_dim == 4) ? &idct_i4[0]
: ((tx_dim == 8) ? &idct_i8[0]
: &idct_i16[0]);
break;
default:
assert(0);
break;
}
nz_dim = tx_dim;
if(tx_dim > 4) {
if(eobs < 36) {
vpx_memset(im, 0, 512);
nz_dim = 8;
if(eobs < 3) {
nz_dim = 2;
} else if(eobs < 10) {
nz_dim = 4;
}
}
}
/* 2-D inverse transform X = M1*Z*Transposed_M2 is calculated in 2 steps
* from right to left:
* 1. horizontal transform: Y= Z*Transposed_M2
* 2. vertical transform: X = M1*Y
* In SIMD, doing this way could eliminate the transpose needed if it is
* calculated from left to right.
*/
/* Horizontal transformation */
for (j = 0; j < tx_dim; j++) {
for (i = 0; i < nz_dim; i++) {
int temp = 0;
for (k = 0; k < nz_dim; k++) {
temp += ip[k] * pth[k];
}
/* Calculate im and store it in its transposed position. */
im[i] = (int16_t)((temp + HORIZONTAL_ROUNDING) >> HORIZONTAL_SHIFT);
ip += tx_dim;
}
im += tx_dim;
pth += tx_dim;
ip = input;
}
/* Vertical transformation */
im = &imbuf[0];
for (i = 0; i < tx_dim; i++) {
for (j = 0; j < tx_dim; j++) {
int temp = 0;
for (k = 0; k < nz_dim; k++) {
temp += ptv[k] * im[k];
}
op[j] = (int16_t)((temp + VERTICAL_ROUNDING) >> VERTICAL_SHIFT);
im += tx_dim;
}
im = &imbuf[0];
ptv += tx_dim;
op += shortpitch;
}
}
void vp9_short_inv_walsh4x4_c(int16_t *input, int16_t *output) {
int i;
int a1, b1, c1, d1;
int16_t *ip = input;
int16_t *op = output;
for (i = 0; i < 4; i++) {
a1 = ((ip[0] + ip[3]));
b1 = ((ip[1] + ip[2]));
c1 = ((ip[1] - ip[2]));
d1 = ((ip[0] - ip[3]));
op[0] = (a1 + b1 + 1) >> 1;
op[1] = (c1 + d1) >> 1;
op[2] = (a1 - b1) >> 1;
op[3] = (d1 - c1) >> 1;
ip += 4;
op += 4;
}
ip = output;
op = output;
for (i = 0; i < 4; i++) {
a1 = ip[0] + ip[12];
b1 = ip[4] + ip[8];
c1 = ip[4] - ip[8];
d1 = ip[0] - ip[12];
op[0] = (a1 + b1 + 1) >> 1;
op[4] = (c1 + d1) >> 1;
op[8] = (a1 - b1) >> 1;
op[12] = (d1 - c1) >> 1;
ip++;
op++;
}
}
void vp9_short_inv_walsh4x4_1_c(int16_t *in, int16_t *out) {
int i;
int16_t tmp[4];
int16_t *ip = in;
int16_t *op = tmp;
op[0] = (ip[0] + 1) >> 1;
op[1] = op[2] = op[3] = (ip[0] >> 1);
ip = tmp;
op = out;
for (i = 0; i < 4; i++) {
op[0] = (ip[0] + 1) >> 1;
op[4] = op[8] = op[12] = (ip[0] >> 1);
ip++;
op++;
}
}
#if CONFIG_LOSSLESS
void vp9_short_inv_walsh4x4_lossless_c(int16_t *input, int16_t *output) {
int i;
int a1, b1, c1, d1;
int16_t *ip = input;
int16_t *op = output;
for (i = 0; i < 4; i++) {
a1 = ((ip[0] + ip[3])) >> Y2_WHT_UPSCALE_FACTOR;
b1 = ((ip[1] + ip[2])) >> Y2_WHT_UPSCALE_FACTOR;
c1 = ((ip[1] - ip[2])) >> Y2_WHT_UPSCALE_FACTOR;
d1 = ((ip[0] - ip[3])) >> Y2_WHT_UPSCALE_FACTOR;
op[0] = (a1 + b1 + 1) >> 1;
op[1] = (c1 + d1) >> 1;
op[2] = (a1 - b1) >> 1;
op[3] = (d1 - c1) >> 1;
ip += 4;
op += 4;
}
ip = output;
op = output;
for (i = 0; i < 4; i++) {
a1 = ip[0] + ip[12];
b1 = ip[4] + ip[8];
c1 = ip[4] - ip[8];
d1 = ip[0] - ip[12];
op[0] = ((a1 + b1 + 1) >> 1) << Y2_WHT_UPSCALE_FACTOR;
op[4] = ((c1 + d1) >> 1) << Y2_WHT_UPSCALE_FACTOR;
op[8] = ((a1 - b1) >> 1) << Y2_WHT_UPSCALE_FACTOR;
op[12] = ((d1 - c1) >> 1) << Y2_WHT_UPSCALE_FACTOR;
ip++;
op++;
}
}
void vp9_short_inv_walsh4x4_1_lossless_c(int16_t *in, int16_t *out) {
int i;
int16_t tmp[4];
int16_t *ip = in;
int16_t *op = tmp;
op[0] = ((ip[0] >> Y2_WHT_UPSCALE_FACTOR) + 1) >> 1;
op[1] = op[2] = op[3] = ((ip[0] >> Y2_WHT_UPSCALE_FACTOR) >> 1);
ip = tmp;
op = out;
for (i = 0; i < 4; i++) {
op[0] = ((ip[0] + 1) >> 1) << Y2_WHT_UPSCALE_FACTOR;
op[4] = op[8] = op[12] = ((ip[0] >> 1)) << Y2_WHT_UPSCALE_FACTOR;
ip++;
op++;
}
}
void vp9_short_inv_walsh4x4_x8_c(int16_t *input, int16_t *output, int pitch) {
int i;
int a1, b1, c1, d1;
int16_t *ip = input;
int16_t *op = output;
int shortpitch = pitch >> 1;
for (i = 0; i < 4; i++) {
a1 = ((ip[0] + ip[3])) >> WHT_UPSCALE_FACTOR;
b1 = ((ip[1] + ip[2])) >> WHT_UPSCALE_FACTOR;
c1 = ((ip[1] - ip[2])) >> WHT_UPSCALE_FACTOR;
d1 = ((ip[0] - ip[3])) >> WHT_UPSCALE_FACTOR;
op[0] = (a1 + b1 + 1) >> 1;
op[1] = (c1 + d1) >> 1;
op[2] = (a1 - b1) >> 1;
op[3] = (d1 - c1) >> 1;
ip += 4;
op += shortpitch;
}
ip = output;
op = output;
for (i = 0; i < 4; i++) {
a1 = ip[shortpitch * 0] + ip[shortpitch * 3];
b1 = ip[shortpitch * 1] + ip[shortpitch * 2];
c1 = ip[shortpitch * 1] - ip[shortpitch * 2];
d1 = ip[shortpitch * 0] - ip[shortpitch * 3];
op[shortpitch * 0] = (a1 + b1 + 1) >> 1;
op[shortpitch * 1] = (c1 + d1) >> 1;
op[shortpitch * 2] = (a1 - b1) >> 1;
op[shortpitch * 3] = (d1 - c1) >> 1;
ip++;
op++;
}
}
void vp9_short_inv_walsh4x4_1_x8_c(int16_t *in, int16_t *out, int pitch) {
int i;
int16_t tmp[4];
int16_t *ip = in;
int16_t *op = tmp;
int shortpitch = pitch >> 1;
op[0] = ((ip[0] >> WHT_UPSCALE_FACTOR) + 1) >> 1;
op[1] = op[2] = op[3] = ((ip[0] >> WHT_UPSCALE_FACTOR) >> 1);
ip = tmp;
op = out;
for (i = 0; i < 4; i++) {
op[shortpitch * 0] = (ip[0] + 1) >> 1;
op[shortpitch * 1] = op[shortpitch * 2] = op[shortpitch * 3] = ip[0] >> 1;
ip++;
op++;
}
}
void vp9_dc_only_inv_walsh_add_c(int input_dc, uint8_t *pred_ptr,
uint8_t *dst_ptr,
int pitch, int stride) {
int r, c;
int16_t dc = input_dc;
int16_t tmp[16];
vp9_short_inv_walsh4x4_1_x8_c(&dc, tmp, 4 << 1);
for (r = 0; r < 4; r++) {
for (c = 0; c < 4; c++) {
dst_ptr[c] = clip_pixel(tmp[r * 4 + c] + pred_ptr[c]);
}
dst_ptr += stride;
pred_ptr += pitch;
}
}
#endif
void idct4_1d(int16_t *input, int16_t *output) {
int16_t step[4];
int temp1, temp2;
// stage 1
temp1 = (input[0] + input[2]) * cospi_16_64;
temp2 = (input[0] - input[2]) * cospi_16_64;
step[0] = dct_const_round_shift(temp1);
step[1] = dct_const_round_shift(temp2);
temp1 = input[1] * cospi_24_64 - input[3] * cospi_8_64;
temp2 = input[1] * cospi_8_64 + input[3] * cospi_24_64;
step[2] = dct_const_round_shift(temp1);
step[3] = dct_const_round_shift(temp2);
// stage 2
output[0] = step[0] + step[3];
output[1] = step[1] + step[2];
output[2] = step[1] - step[2];
output[3] = step[0] - step[3];
}
void vp9_short_idct4x4llm_c(int16_t *input, int16_t *output, int pitch) {
int16_t out[4 * 4];
int16_t *outptr = &out[0];
const int short_pitch = pitch >> 1;
int i, j;
int16_t temp_in[4], temp_out[4];
// First transform rows
for (i = 0; i < 4; ++i) {
for (j = 0; j < 4; ++j)
temp_in[j] = input[j];
idct4_1d(temp_in, outptr);
input += 4;
outptr += 4;
}
// Then transform columns
for (i = 0; i < 4; ++i) {
for (j = 0; j < 4; ++j)
temp_in[j] = out[j * 4 + i];
idct4_1d(temp_in, temp_out);
for (j = 0; j < 4; ++j)
output[j * short_pitch + i] = (temp_out[j] + 8) >> 4;
}
}
void vp9_short_idct4x4llm_1_c(int16_t *input, int16_t *output, int pitch) {
int i;
int a1;
int16_t *op = output;
int shortpitch = pitch >> 1;
int tmp;
int16_t out;
tmp = input[0] * cospi_16_64;
out = dct_const_round_shift(tmp);
tmp = out * cospi_16_64;
out = dct_const_round_shift(tmp);
a1 = (out + 8) >> 4;
for (i = 0; i < 4; i++) {
op[0] = a1;
op[1] = a1;
op[2] = a1;
op[3] = a1;
op += shortpitch;
}
}
void vp9_dc_only_idct_add_c(int input_dc, uint8_t *pred_ptr,
uint8_t *dst_ptr, int pitch, int stride) {
int a1;
int r, c;
int tmp;
int16_t out;
tmp = input_dc * cospi_16_64;
out = dct_const_round_shift(tmp);
tmp = out * cospi_16_64;
out = dct_const_round_shift(tmp);
a1 = (out + 8) >> 4;
for (r = 0; r < 4; r++) {
for (c = 0; c < 4; c++) {
dst_ptr[c] = clip_pixel(a1 + pred_ptr[c]);
}
dst_ptr += stride;
pred_ptr += pitch;
}
}
void idct8_1d(int16_t *input, int16_t *output) {
int16_t step1[8], step2[8];
int temp1, temp2;
// stage 1
step1[0] = input[0];
step1[2] = input[4];
step1[1] = input[2];
step1[3] = input[6];
temp1 = input[1] * cospi_28_64 - input[7] * cospi_4_64;
temp2 = input[1] * cospi_4_64 + input[7] * cospi_28_64;
step1[4] = dct_const_round_shift(temp1);
step1[7] = dct_const_round_shift(temp2);
temp1 = input[5] * cospi_12_64 - input[3] * cospi_20_64;
temp2 = input[5] * cospi_20_64 + input[3] * cospi_12_64;
step1[5] = dct_const_round_shift(temp1);
step1[6] = dct_const_round_shift(temp2);
// stage 2 & stage 3 - even half
idct4_1d(step1, step1);
// stage 2 - odd half
step2[4] = step1[4] + step1[5];
step2[5] = step1[4] - step1[5];
step2[6] = -step1[6] + step1[7];
step2[7] = step1[6] + step1[7];
// stage 3 -odd half
step1[4] = step2[4];
temp1 = (step2[6] - step2[5]) * cospi_16_64;
temp2 = (step2[5] + step2[6]) * cospi_16_64;
step1[5] = dct_const_round_shift(temp1);
step1[6] = dct_const_round_shift(temp2);
step1[7] = step2[7];
// stage 4
output[0] = step1[0] + step1[7];
output[1] = step1[1] + step1[6];
output[2] = step1[2] + step1[5];
output[3] = step1[3] + step1[4];
output[4] = step1[3] - step1[4];
output[5] = step1[2] - step1[5];
output[6] = step1[1] - step1[6];
output[7] = step1[0] - step1[7];
}
void vp9_short_idct8x8_c(int16_t *input, int16_t *output, int pitch) {
int16_t out[8 * 8];
int16_t *outptr = &out[0];
const int short_pitch = pitch >> 1;
int i, j;
int16_t temp_in[8], temp_out[8];
// First transform rows
for (i = 0; i < 8; ++i) {
idct8_1d(input, outptr);
input += 8;
outptr += 8;
}
// Then transform columns
for (i = 0; i < 8; ++i) {
for (j = 0; j < 8; ++j)
temp_in[j] = out[j * 8 + i];
idct8_1d(temp_in, temp_out);
for (j = 0; j < 8; ++j)
output[j * short_pitch + i] = (temp_out[j] + 16) >> 5;
}
}
#if CONFIG_INTHT4X4
static void iadst4_1d(int16_t *input, int16_t *output) {
int x0, x1, x2, x3;
int s0, s1, s2, s3, s4, s5, s6, s7;
x0 = input[0];
x1 = input[1];
x2 = input[2];
x3 = input[3];
if (!(x0 | x1 | x2 | x3)) {
output[0] = output[1] = output[2] = output[3] = 0;
return;
}
s0 = sinpi_1_9 * x0;
s1 = sinpi_2_9 * x0;
s2 = sinpi_3_9 * x1;
s3 = sinpi_4_9 * x2;
s4 = sinpi_1_9 * x2;
s5 = sinpi_2_9 * x3;
s6 = sinpi_4_9 * x3;
s7 = x0 - x2 + x3;
x0 = s0 + s3 + s5;
x1 = s1 - s4 - s6;
x2 = sinpi_3_9 * s7;
x3 = s2;
s0 = x0 + x3;
s1 = x1 + x3;
s2 = x2;
s3 = x0 + x1 - x3;
// 1-D transform scaling factor is sqrt(2).
// The overall dynamic range is 14b (input) + 14b (multiplication scaling)
// + 1b (addition) = 29b.
// Hence the output bit depth is 15b.
output[0] = dct_const_round_shift(s0);
output[1] = dct_const_round_shift(s1);
output[2] = dct_const_round_shift(s2);
output[3] = dct_const_round_shift(s3);
}
void vp9_short_iht4x4_c(int16_t *input, int16_t *output,
int pitch, TX_TYPE tx_type) {
int16_t out[16];
int16_t *outptr = &out[0];
const int short_pitch = pitch >> 1;
int i, j;
int16_t temp_in[4], temp_out[4];
void (*invr)(int16_t*, int16_t*);
void (*invc)(int16_t*, int16_t*);
switch (tx_type) {
case ADST_ADST:
invc = &iadst4_1d;
invr = &iadst4_1d;
break;
case ADST_DCT:
invc = &iadst4_1d;
invr = &idct4_1d;
break;
case DCT_ADST:
invc = &idct4_1d;
invr = &iadst4_1d;
break;
case DCT_DCT:
invc = &idct4_1d;
invr = &idct4_1d;
break;
default:
assert(0);
}
// inverse transform row vectors
for (i = 0; i < 4; ++i) {
invr(input, outptr);
input += 4;
outptr += 4;
}
// inverse transform column vectors
for (i = 0; i < 4; ++i) {
for (j = 0; j < 4; ++j)
temp_in[j] = out[j * 4 + i];
invc(temp_in, temp_out);
for (j = 0; j < 4; ++j)
output[j * short_pitch + i] = (temp_out[j] + 8) >> 4;
}
}
#endif
#if CONFIG_INTHT
static void iadst8_1d(int16_t *input, int16_t *output) {
int x0, x1, x2, x3, x4, x5, x6, x7;
int s0, s1, s2, s3, s4, s5, s6, s7;
x0 = input[7];
x1 = input[0];
x2 = input[5];
x3 = input[2];
x4 = input[3];
x5 = input[4];
x6 = input[1];
x7 = input[6];
if (!(x0 | x1 | x2 | x3 | x4 | x5 | x6 | x7)) {
output[0] = output[1] = output[2] = output[3] = output[4]
= output[5] = output[6] = output[7] = 0;
return;
}
// stage 1
s0 = cospi_2_64 * x0 + cospi_30_64 * x1;
s1 = cospi_30_64 * x0 - cospi_2_64 * x1;
s2 = cospi_10_64 * x2 + cospi_22_64 * x3;
s3 = cospi_22_64 * x2 - cospi_10_64 * x3;
s4 = cospi_18_64 * x4 + cospi_14_64 * x5;
s5 = cospi_14_64 * x4 - cospi_18_64 * x5;
s6 = cospi_26_64 * x6 + cospi_6_64 * x7;
s7 = cospi_6_64 * x6 - cospi_26_64 * x7;
x0 = dct_const_round_shift(s0 + s4);
x1 = dct_const_round_shift(s1 + s5);
x2 = dct_const_round_shift(s2 + s6);
x3 = dct_const_round_shift(s3 + s7);
x4 = dct_const_round_shift(s0 - s4);
x5 = dct_const_round_shift(s1 - s5);
x6 = dct_const_round_shift(s2 - s6);
x7 = dct_const_round_shift(s3 - s7);
// stage 2
s0 = x0;
s1 = x1;
s2 = x2;
s3 = x3;
s4 = cospi_8_64 * x4 + cospi_24_64 * x5;
s5 = cospi_24_64 * x4 - cospi_8_64 * x5;
s6 = - cospi_24_64 * x6 + cospi_8_64 * x7;
s7 = cospi_8_64 * x6 + cospi_24_64 * x7;
x0 = s0 + s2;
x1 = s1 + s3;
x2 = s0 - s2;
x3 = s1 - s3;
x4 = dct_const_round_shift(s4 + s6);
x5 = dct_const_round_shift(s5 + s7);
x6 = dct_const_round_shift(s4 - s6);
x7 = dct_const_round_shift(s5 - s7);
// stage 3
s2 = cospi_16_64 * (x2 + x3);
s3 = cospi_16_64 * (x2 - x3);
s6 = cospi_16_64 * (x6 + x7);
s7 = cospi_16_64 * (x6 - x7);
x2 = dct_const_round_shift(s2);
x3 = dct_const_round_shift(s3);
x6 = dct_const_round_shift(s6);
x7 = dct_const_round_shift(s7);
output[0] = x0;
output[1] = - x4;
output[2] = x6;
output[3] = - x2;
output[4] = x3;
output[5] = - x7;
output[6] = x5;
output[7] = - x1;
return;
}
void vp9_short_iht8x8_c(int16_t *input, int16_t *output,
int pitch, TX_TYPE tx_type) {
int16_t out[8 * 8];
int16_t *outptr = &out[0];
const int short_pitch = pitch >> 1;
int i, j;
int16_t temp_in[8], temp_out[8];
void (*invr)(int16_t*, int16_t*);
void (*invc)(int16_t*, int16_t*);
switch (tx_type) {
case ADST_ADST:
invc = &iadst8_1d;
invr = &iadst8_1d;
break;
case ADST_DCT:
invc = &iadst8_1d;
invr = &idct8_1d;
break;
case DCT_ADST:
invc = &idct8_1d;
invr = &iadst8_1d;
break;
case DCT_DCT:
invc = &idct8_1d;
invr = &idct8_1d;
break;
default:
assert(0);
}
// inverse transform row vectors
for (i = 0; i < 8; ++i) {
invr(input, outptr);
input += 8;
outptr += 8;
}
// inverse transform column vectors
for (i = 0; i < 8; ++i) {
for (j = 0; j < 8; ++j)
temp_in[j] = out[j * 8 + i];
invc(temp_in, temp_out);
for (j = 0; j < 8; ++j)
output[j * short_pitch + i] = (temp_out[j] + 16) >> 5;
}
}
#endif
void vp9_short_idct10_8x8_c(int16_t *input, int16_t *output, int pitch) {
int16_t out[8 * 8];
int16_t *outptr = &out[0];
const int short_pitch = pitch >> 1;
int i, j;
int16_t temp_in[8], temp_out[8];
vpx_memset(out, 0, sizeof(out));
// First transform rows
// only first 4 row has non-zero coefs
for (i = 0; i < 4; ++i) {
idct8_1d(input, outptr);
input += 8;
outptr += 8;
}
// Then transform columns
for (i = 0; i < 8; ++i) {
for (j = 0; j < 8; ++j)
temp_in[j] = out[j * 8 + i];
idct8_1d(temp_in, temp_out);
for (j = 0; j < 8; ++j)
output[j * short_pitch + i] = (temp_out[j] + 16) >> 5;
}
}
void vp9_short_idct1_8x8_c(int16_t *input, int16_t *output) {
int tmp;
int16_t out;
tmp = input[0] * cospi_16_64;
out = dct_const_round_shift(tmp);
tmp = out * cospi_16_64;
out = dct_const_round_shift(tmp);
*output = (out + 16) >> 5;
}
void vp9_short_ihaar2x2_c(int16_t *input, int16_t *output, int pitch) {
int i;
int16_t *ip = input; // 0, 1, 4, 8
int16_t *op = output;
for (i = 0; i < 16; i++) {
op[i] = 0;
}
op[0] = (ip[0] + ip[1] + ip[4] + ip[8] + 1) >> 1;
op[1] = (ip[0] - ip[1] + ip[4] - ip[8]) >> 1;
op[4] = (ip[0] + ip[1] - ip[4] - ip[8]) >> 1;
op[8] = (ip[0] - ip[1] - ip[4] + ip[8]) >> 1;
}
void idct16_1d(int16_t *input, int16_t *output) {
int16_t step1[16], step2[16];
int temp1, temp2;
// stage 1
step1[0] = input[0/2];
step1[1] = input[16/2];
step1[2] = input[8/2];
step1[3] = input[24/2];
step1[4] = input[4/2];
step1[5] = input[20/2];
step1[6] = input[12/2];
step1[7] = input[28/2];
step1[8] = input[2/2];
step1[9] = input[18/2];
step1[10] = input[10/2];
step1[11] = input[26/2];
step1[12] = input[6/2];
step1[13] = input[22/2];
step1[14] = input[14/2];
step1[15] = input[30/2];
// stage 2
step2[0] = step1[0];
step2[1] = step1[1];
step2[2] = step1[2];
step2[3] = step1[3];
step2[4] = step1[4];
step2[5] = step1[5];
step2[6] = step1[6];
step2[7] = step1[7];
temp1 = step1[8] * cospi_30_64 - step1[15] * cospi_2_64;
temp2 = step1[8] * cospi_2_64 + step1[15] * cospi_30_64;
step2[8] = dct_const_round_shift(temp1);
step2[15] = dct_const_round_shift(temp2);
temp1 = step1[9] * cospi_14_64 - step1[14] * cospi_18_64;
temp2 = step1[9] * cospi_18_64 + step1[14] * cospi_14_64;
step2[9] = dct_const_round_shift(temp1);
step2[14] = dct_const_round_shift(temp2);
temp1 = step1[10] * cospi_22_64 - step1[13] * cospi_10_64;
temp2 = step1[10] * cospi_10_64 + step1[13] * cospi_22_64;
step2[10] = dct_const_round_shift(temp1);
step2[13] = dct_const_round_shift(temp2);
temp1 = step1[11] * cospi_6_64 - step1[12] * cospi_26_64;
temp2 = step1[11] * cospi_26_64 + step1[12] * cospi_6_64;
step2[11] = dct_const_round_shift(temp1);
step2[12] = dct_const_round_shift(temp2);
// stage 3
step1[0] = step2[0];
step1[1] = step2[1];
step1[2] = step2[2];
step1[3] = step2[3];
temp1 = step2[4] * cospi_28_64 - step2[7] * cospi_4_64;
temp2 = step2[4] * cospi_4_64 + step2[7] * cospi_28_64;
step1[4] = dct_const_round_shift(temp1);
step1[7] = dct_const_round_shift(temp2);
temp1 = step2[5] * cospi_12_64 - step2[6] * cospi_20_64;
temp2 = step2[5] * cospi_20_64 + step2[6] * cospi_12_64;
step1[5] = dct_const_round_shift(temp1);
step1[6] = dct_const_round_shift(temp2);
step1[8] = step2[8] + step2[9];
step1[9] = step2[8] - step2[9];
step1[10] = -step2[10] + step2[11];
step1[11] = step2[10] + step2[11];
step1[12] = step2[12] + step2[13];
step1[13] = step2[12] - step2[13];
step1[14] = -step2[14] + step2[15];
step1[15] = step2[14] + step2[15];
temp1 = (step1[0] + step1[1]) * cospi_16_64;
temp2 = (step1[0] - step1[1]) * cospi_16_64;
step2[0] = dct_const_round_shift(temp1);
step2[1] = dct_const_round_shift(temp2);
temp1 = step1[2] * cospi_24_64 - step1[3] * cospi_8_64;
temp2 = step1[2] * cospi_8_64 + step1[3] * cospi_24_64;
step2[2] = dct_const_round_shift(temp1);
step2[3] = dct_const_round_shift(temp2);
step2[4] = step1[4] + step1[5];
step2[5] = step1[4] - step1[5];
step2[6] = -step1[6] + step1[7];
step2[7] = step1[6] + step1[7];
step2[8] = step1[8];
step2[15] = step1[15];
temp1 = -step1[9] * cospi_8_64 + step1[14] * cospi_24_64;
temp2 = step1[9] * cospi_24_64 + step1[14] * cospi_8_64;
step2[9] = dct_const_round_shift(temp1);
step2[14] = dct_const_round_shift(temp2);
temp1 = -step1[10] * cospi_24_64 - step1[13] * cospi_8_64;
temp2 = -step1[10] * cospi_8_64 + step1[13] * cospi_24_64;
step2[10] = dct_const_round_shift(temp1);
step2[13] = dct_const_round_shift(temp2);
step2[11] = step1[11];
step2[12] = step1[12];
// stage 5
step1[0] = step2[0] + step2[3];
step1[1] = step2[1] + step2[2];
step1[2] = step2[1] - step2[2];
step1[3] = step2[0] - step2[3];
step1[4] = step2[4];
temp1 = (step2[6] - step2[5]) * cospi_16_64;
temp2 = (step2[5] + step2[6]) * cospi_16_64;
step1[5] = dct_const_round_shift(temp1);
step1[6] = dct_const_round_shift(temp2);
step1[7] = step2[7];
step1[8] = step2[8] + step2[11];
step1[9] = step2[9] + step2[10];
step1[10] = step2[9] - step2[10];
step1[11] = step2[8] - step2[11];
step1[12] = -step2[12] + step2[15];
step1[13] = -step2[13] + step2[14];
step1[14] = step2[13] + step2[14];
step1[15] = step2[12] + step2[15];
// stage 6
step2[0] = step1[0] + step1[7];
step2[1] = step1[1] + step1[6];
step2[2] = step1[2] + step1[5];
step2[3] = step1[3] + step1[4];
step2[4] = step1[3] - step1[4];
step2[5] = step1[2] - step1[5];
step2[6] = step1[1] - step1[6];
step2[7] = step1[0] - step1[7];
step2[8] = step1[8];
step2[9] = step1[9];
temp1 = (-step1[10] + step1[13]) * cospi_16_64;
temp2 = (step1[10] + step1[13]) * cospi_16_64;
step2[10] = dct_const_round_shift(temp1);
step2[13] = dct_const_round_shift(temp2);
temp1 = (-step1[11] + step1[12]) * cospi_16_64;
temp2 = (step1[11] + step1[12]) * cospi_16_64;
step2[11] = dct_const_round_shift(temp1);
step2[12] = dct_const_round_shift(temp2);
step2[14] = step1[14];
step2[15] = step1[15];
// stage 7
output[0] = step2[0] + step2[15];
output[1] = step2[1] + step2[14];
output[2] = step2[2] + step2[13];
output[3] = step2[3] + step2[12];
output[4] = step2[4] + step2[11];
output[5] = step2[5] + step2[10];
output[6] = step2[6] + step2[9];
output[7] = step2[7] + step2[8];
output[8] = step2[7] - step2[8];
output[9] = step2[6] - step2[9];
output[10] = step2[5] - step2[10];
output[11] = step2[4] - step2[11];
output[12] = step2[3] - step2[12];
output[13] = step2[2] - step2[13];
output[14] = step2[1] - step2[14];
output[15] = step2[0] - step2[15];
}
void vp9_short_idct16x16_c(int16_t *input, int16_t *output, int pitch) {
int16_t out[16 * 16];
int16_t *outptr = &out[0];
const int short_pitch = pitch >> 1;
int i, j;
int16_t temp_in[16], temp_out[16];
// First transform rows
for (i = 0; i < 16; ++i) {
idct16_1d(input, outptr);
input += short_pitch;
outptr += 16;
}
// Then transform columns
for (i = 0; i < 16; ++i) {
for (j = 0; j < 16; ++j)
temp_in[j] = out[j * 16 + i];
idct16_1d(temp_in, temp_out);
for (j = 0; j < 16; ++j)
output[j * 16 + i] = (temp_out[j] + 32) >> 6;
}
}
void vp9_short_idct10_16x16_c(int16_t *input, int16_t *output, int pitch) {
int16_t out[16 * 16];
int16_t *outptr = &out[0];
const int short_pitch = pitch >> 1;
int i, j;
int16_t temp_in[16], temp_out[16];
/* First transform rows. Since all non-zero dct coefficients are in
* upper-left 4x4 area, we only need to calculate first 4 rows here.
*/
vpx_memset(out, 0, sizeof(out));
for (i = 0; i < 4; ++i) {
idct16_1d(input, outptr);
input += short_pitch;
outptr += 16;
}
// Then transform columns
for (i = 0; i < 16; ++i) {
for (j = 0; j < 16; ++j)
temp_in[j] = out[j*16 + i];
idct16_1d(temp_in, temp_out);
for (j = 0; j < 16; ++j)
output[j*16 + i] = (temp_out[j] + 32) >> 6;
}
}
void vp9_short_idct1_16x16_c(int16_t *input, int16_t *output) {
int tmp;
int16_t out;
tmp = input[0] * cospi_16_64;
out = dct_const_round_shift(tmp);
tmp = out * cospi_16_64;
out = dct_const_round_shift(tmp);
*output = (out + 32) >> 6;
}
void idct32_1d(int16_t *input, int16_t *output) {
int16_t step1[32], step2[32];
int temp1, temp2;
// stage 1
step1[0] = input[0];
step1[1] = input[16];
step1[2] = input[8];
step1[3] = input[24];
step1[4] = input[4];
step1[5] = input[20];
step1[6] = input[12];
step1[7] = input[28];
step1[8] = input[2];
step1[9] = input[18];
step1[10] = input[10];
step1[11] = input[26];
step1[12] = input[6];
step1[13] = input[22];
step1[14] = input[14];
step1[15] = input[30];
temp1 = input[1] * cospi_31_64 - input[31] * cospi_1_64;
temp2 = input[1] * cospi_1_64 + input[31] * cospi_31_64;
step1[16] = dct_const_round_shift(temp1);
step1[31] = dct_const_round_shift(temp2);
temp1 = input[17] * cospi_15_64 - input[15] * cospi_17_64;
temp2 = input[17] * cospi_17_64 + input[15] * cospi_15_64;
step1[17] = dct_const_round_shift(temp1);
step1[30] = dct_const_round_shift(temp2);
temp1 = input[9] * cospi_23_64 - input[23] * cospi_9_64;
temp2 = input[9] * cospi_9_64 + input[23] * cospi_23_64;
step1[18] = dct_const_round_shift(temp1);
step1[29] = dct_const_round_shift(temp2);
temp1 = input[25] * cospi_7_64 - input[7] * cospi_25_64;
temp2 = input[25] * cospi_25_64 + input[7] * cospi_7_64;
step1[19] = dct_const_round_shift(temp1);
step1[28] = dct_const_round_shift(temp2);
temp1 = input[5] * cospi_27_64 - input[27] * cospi_5_64;
temp2 = input[5] * cospi_5_64 + input[27] * cospi_27_64;
step1[20] = dct_const_round_shift(temp1);
step1[27] = dct_const_round_shift(temp2);
temp1 = input[21] * cospi_11_64 - input[11] * cospi_21_64;
temp2 = input[21] * cospi_21_64 + input[11] * cospi_11_64;
step1[21] = dct_const_round_shift(temp1);
step1[26] = dct_const_round_shift(temp2);
temp1 = input[13] * cospi_19_64 - input[19] * cospi_13_64;
temp2 = input[13] * cospi_13_64 + input[19] * cospi_19_64;
step1[22] = dct_const_round_shift(temp1);
step1[25] = dct_const_round_shift(temp2);
temp1 = input[29] * cospi_3_64 - input[3] * cospi_29_64;
temp2 = input[29] * cospi_29_64 + input[3] * cospi_3_64;
step1[23] = dct_const_round_shift(temp1);
step1[24] = dct_const_round_shift(temp2);
// stage 2
step2[0] = step1[0];
step2[1] = step1[1];
step2[2] = step1[2];
step2[3] = step1[3];
step2[4] = step1[4];
step2[5] = step1[5];
step2[6] = step1[6];
step2[7] = step1[7];
temp1 = step1[8] * cospi_30_64 - step1[15] * cospi_2_64;
temp2 = step1[8] * cospi_2_64 + step1[15] * cospi_30_64;
step2[8] = dct_const_round_shift(temp1);
step2[15] = dct_const_round_shift(temp2);
temp1 = step1[9] * cospi_14_64 - step1[14] * cospi_18_64;
temp2 = step1[9] * cospi_18_64 + step1[14] * cospi_14_64;
step2[9] = dct_const_round_shift(temp1);
step2[14] = dct_const_round_shift(temp2);
temp1 = step1[10] * cospi_22_64 - step1[13] * cospi_10_64;
temp2 = step1[10] * cospi_10_64 + step1[13] * cospi_22_64;
step2[10] = dct_const_round_shift(temp1);
step2[13] = dct_const_round_shift(temp2);
temp1 = step1[11] * cospi_6_64 - step1[12] * cospi_26_64;
temp2 = step1[11] * cospi_26_64 + step1[12] * cospi_6_64;
step2[11] = dct_const_round_shift(temp1);
step2[12] = dct_const_round_shift(temp2);
step2[16] = step1[16] + step1[17];
step2[17] = step1[16] - step1[17];
step2[18] = -step1[18] + step1[19];
step2[19] = step1[18] + step1[19];
step2[20] = step1[20] + step1[21];
step2[21] = step1[20] - step1[21];
step2[22] = -step1[22] + step1[23];
step2[23] = step1[22] + step1[23];
step2[24] = step1[24] + step1[25];
step2[25] = step1[24] - step1[25];
step2[26] = -step1[26] + step1[27];
step2[27] = step1[26] + step1[27];
step2[28] = step1[28] + step1[29];
step2[29] = step1[28] - step1[29];
step2[30] = -step1[30] + step1[31];
step2[31] = step1[30] + step1[31];
// stage 3
step1[0] = step2[0];
step1[1] = step2[1];
step1[2] = step2[2];
step1[3] = step2[3];
temp1 = step2[4] * cospi_28_64 - step2[7] * cospi_4_64;
temp2 = step2[4] * cospi_4_64 + step2[7] * cospi_28_64;
step1[4] = dct_const_round_shift(temp1);
step1[7] = dct_const_round_shift(temp2);
temp1 = step2[5] * cospi_12_64 - step2[6] * cospi_20_64;
temp2 = step2[5] * cospi_20_64 + step2[6] * cospi_12_64;
step1[5] = dct_const_round_shift(temp1);
step1[6] = dct_const_round_shift(temp2);
step1[8] = step2[8] + step2[9];
step1[9] = step2[8] - step2[9];
step1[10] = -step2[10] + step2[11];
step1[11] = step2[10] + step2[11];
step1[12] = step2[12] + step2[13];
step1[13] = step2[12] - step2[13];
step1[14] = -step2[14] + step2[15];
step1[15] = step2[14] + step2[15];
step1[16] = step2[16];
step1[31] = step2[31];
temp1 = -step2[17] * cospi_4_64 + step2[30] * cospi_28_64;
temp2 = step2[17] * cospi_28_64 + step2[30] * cospi_4_64;
step1[17] = dct_const_round_shift(temp1);
step1[30] = dct_const_round_shift(temp2);
temp1 = -step2[18] * cospi_28_64 - step2[29] * cospi_4_64;
temp2 = -step2[18] * cospi_4_64 + step2[29] * cospi_28_64;
step1[18] = dct_const_round_shift(temp1);
step1[29] = dct_const_round_shift(temp2);
step1[19] = step2[19];
step1[20] = step2[20];
temp1 = -step2[21] * cospi_20_64 + step2[26] * cospi_12_64;
temp2 = step2[21] * cospi_12_64 + step2[26] * cospi_20_64;
step1[21] = dct_const_round_shift(temp1);
step1[26] = dct_const_round_shift(temp2);
temp1 = -step2[22] * cospi_12_64 - step2[25] * cospi_20_64;
temp2 = -step2[22] * cospi_20_64 + step2[25] * cospi_12_64;
step1[22] = dct_const_round_shift(temp1);
step1[25] = dct_const_round_shift(temp2);
step1[23] = step2[23];
step1[24] = step2[24];
step1[27] = step2[27];
step1[28] = step2[28];
// stage 4
temp1 = (step1[0] + step1[1]) * cospi_16_64;
temp2 = (step1[0] - step1[1]) * cospi_16_64;
step2[0] = dct_const_round_shift(temp1);
step2[1] = dct_const_round_shift(temp2);
temp1 = step1[2] * cospi_24_64 - step1[3] * cospi_8_64;
temp2 = step1[2] * cospi_8_64 + step1[3] * cospi_24_64;
step2[2] = dct_const_round_shift(temp1);
step2[3] = dct_const_round_shift(temp2);
step2[4] = step1[4] + step1[5];
step2[5] = step1[4] - step1[5];
step2[6] = -step1[6] + step1[7];
step2[7] = step1[6] + step1[7];
step2[8] = step1[8];
step2[15] = step1[15];
temp1 = -step1[9] * cospi_8_64 + step1[14] * cospi_24_64;
temp2 = step1[9] * cospi_24_64 + step1[14] * cospi_8_64;
step2[9] = dct_const_round_shift(temp1);
step2[14] = dct_const_round_shift(temp2);
temp1 = -step1[10] * cospi_24_64 - step1[13] * cospi_8_64;
temp2 = -step1[10] * cospi_8_64 + step1[13] * cospi_24_64;
step2[10] = dct_const_round_shift(temp1);
step2[13] = dct_const_round_shift(temp2);
step2[11] = step1[11];
step2[12] = step1[12];
step2[16] = step1[16] + step1[19];
step2[17] = step1[17] + step1[18];
step2[18] = step1[17] - step1[18];
step2[19] = step1[16] - step1[19];
step2[20] = -step1[20] + step1[23];
step2[21] = -step1[21] + step1[22];
step2[22] = step1[21] + step1[22];
step2[23] = step1[20] + step1[23];
step2[24] = step1[24] + step1[27];
step2[25] = step1[25] + step1[26];
step2[26] = step1[25] - step1[26];
step2[27] = step1[24] - step1[27];
step2[28] = -step1[28] + step1[31];
step2[29] = -step1[29] + step1[30];
step2[30] = step1[29] + step1[30];
step2[31] = step1[28] + step1[31];
// stage 5
step1[0] = step2[0] + step2[3];
step1[1] = step2[1] + step2[2];
step1[2] = step2[1] - step2[2];
step1[3] = step2[0] - step2[3];
step1[4] = step2[4];
temp1 = (step2[6] - step2[5]) * cospi_16_64;
temp2 = (step2[5] + step2[6]) * cospi_16_64;
step1[5] = dct_const_round_shift(temp1);
step1[6] = dct_const_round_shift(temp2);
step1[7] = step2[7];
step1[8] = step2[8] + step2[11];
step1[9] = step2[9] + step2[10];
step1[10] = step2[9] - step2[10];
step1[11] = step2[8] - step2[11];
step1[12] = -step2[12] + step2[15];
step1[13] = -step2[13] + step2[14];
step1[14] = step2[13] + step2[14];
step1[15] = step2[12] + step2[15];
step1[16] = step2[16];
step1[17] = step2[17];
temp1 = -step2[18] * cospi_8_64 + step2[29] * cospi_24_64;
temp2 = step2[18] * cospi_24_64 + step2[29] * cospi_8_64;
step1[18] = dct_const_round_shift(temp1);
step1[29] = dct_const_round_shift(temp2);
temp1 = -step2[19] * cospi_8_64 + step2[28] * cospi_24_64;
temp2 = step2[19] * cospi_24_64 + step2[28] * cospi_8_64;
step1[19] = dct_const_round_shift(temp1);
step1[28] = dct_const_round_shift(temp2);
temp1 = -step2[20] * cospi_24_64 - step2[27] * cospi_8_64;
temp2 = -step2[20] * cospi_8_64 + step2[27] * cospi_24_64;
step1[20] = dct_const_round_shift(temp1);
step1[27] = dct_const_round_shift(temp2);
temp1 = -step2[21] * cospi_24_64 - step2[26] * cospi_8_64;
temp2 = -step2[21] * cospi_8_64 + step2[26] * cospi_24_64;
step1[21] = dct_const_round_shift(temp1);
step1[26] = dct_const_round_shift(temp2);
step1[22] = step2[22];
step1[23] = step2[23];
step1[24] = step2[24];
step1[25] = step2[25];
step1[30] = step2[30];
step1[31] = step2[31];
// stage 6
step2[0] = step1[0] + step1[7];
step2[1] = step1[1] + step1[6];
step2[2] = step1[2] + step1[5];
step2[3] = step1[3] + step1[4];
step2[4] = step1[3] - step1[4];
step2[5] = step1[2] - step1[5];
step2[6] = step1[1] - step1[6];
step2[7] = step1[0] - step1[7];
step2[8] = step1[8];
step2[9] = step1[9];
temp1 = (-step1[10] + step1[13]) * cospi_16_64;
temp2 = (step1[10] + step1[13]) * cospi_16_64;
step2[10] = dct_const_round_shift(temp1);
step2[13] = dct_const_round_shift(temp2);
temp1 = (-step1[11] + step1[12]) * cospi_16_64;
temp2 = (step1[11] + step1[12]) * cospi_16_64;
step2[11] = dct_const_round_shift(temp1);
step2[12] = dct_const_round_shift(temp2);
step2[14] = step1[14];
step2[15] = step1[15];
step2[16] = step1[16] + step1[23];
step2[17] = step1[17] + step1[22];
step2[18] = step1[18] + step1[21];
step2[19] = step1[19] + step1[20];
step2[20] = step1[19] - step1[20];
step2[21] = step1[18] - step1[21];
step2[22] = step1[17] - step1[22];
step2[23] = step1[16] - step1[23];
step2[24] = -step1[24] + step1[31];
step2[25] = -step1[25] + step1[30];
step2[26] = -step1[26] + step1[29];
step2[27] = -step1[27] + step1[28];
step2[28] = step1[27] + step1[28];
step2[29] = step1[26] + step1[29];
step2[30] = step1[25] + step1[30];
step2[31] = step1[24] + step1[31];
// stage 7
step1[0] = step2[0] + step2[15];
step1[1] = step2[1] + step2[14];
step1[2] = step2[2] + step2[13];
step1[3] = step2[3] + step2[12];
step1[4] = step2[4] + step2[11];
step1[5] = step2[5] + step2[10];
step1[6] = step2[6] + step2[9];
step1[7] = step2[7] + step2[8];
step1[8] = step2[7] - step2[8];
step1[9] = step2[6] - step2[9];
step1[10] = step2[5] - step2[10];
step1[11] = step2[4] - step2[11];
step1[12] = step2[3] - step2[12];
step1[13] = step2[2] - step2[13];
step1[14] = step2[1] - step2[14];
step1[15] = step2[0] - step2[15];
step1[16] = step2[16];
step1[17] = step2[17];
step1[18] = step2[18];
step1[19] = step2[19];
temp1 = (-step2[20] + step2[27]) * cospi_16_64;
temp2 = (step2[20] + step2[27]) * cospi_16_64;
step1[20] = dct_const_round_shift(temp1);
step1[27] = dct_const_round_shift(temp2);
temp1 = (-step2[21] + step2[26]) * cospi_16_64;
temp2 = (step2[21] + step2[26]) * cospi_16_64;
step1[21] = dct_const_round_shift(temp1);
step1[26] = dct_const_round_shift(temp2);
temp1 = (-step2[22] + step2[25]) * cospi_16_64;
temp2 = (step2[22] + step2[25]) * cospi_16_64;
step1[22] = dct_const_round_shift(temp1);
step1[25] = dct_const_round_shift(temp2);
temp1 = (-step2[23] + step2[24]) * cospi_16_64;
temp2 = (step2[23] + step2[24]) * cospi_16_64;
step1[23] = dct_const_round_shift(temp1);
step1[24] = dct_const_round_shift(temp2);
step1[28] = step2[28];
step1[29] = step2[29];
step1[30] = step2[30];
step1[31] = step2[31];
// final stage
output[0] = step1[0] + step1[31];
output[1] = step1[1] + step1[30];
output[2] = step1[2] + step1[29];
output[3] = step1[3] + step1[28];
output[4] = step1[4] + step1[27];
output[5] = step1[5] + step1[26];
output[6] = step1[6] + step1[25];
output[7] = step1[7] + step1[24];
output[8] = step1[8] + step1[23];
output[9] = step1[9] + step1[22];
output[10] = step1[10] + step1[21];
output[11] = step1[11] + step1[20];
output[12] = step1[12] + step1[19];
output[13] = step1[13] + step1[18];
output[14] = step1[14] + step1[17];
output[15] = step1[15] + step1[16];
output[16] = step1[15] - step1[16];
output[17] = step1[14] - step1[17];
output[18] = step1[13] - step1[18];
output[19] = step1[12] - step1[19];
output[20] = step1[11] - step1[20];
output[21] = step1[10] - step1[21];
output[22] = step1[9] - step1[22];
output[23] = step1[8] - step1[23];
output[24] = step1[7] - step1[24];
output[25] = step1[6] - step1[25];
output[26] = step1[5] - step1[26];
output[27] = step1[4] - step1[27];
output[28] = step1[3] - step1[28];
output[29] = step1[2] - step1[29];
output[30] = step1[1] - step1[30];
output[31] = step1[0] - step1[31];
}
void vp9_short_idct32x32_c(int16_t *input, int16_t *output, int pitch) {
int16_t out[32 * 32];
int16_t *outptr = &out[0];
const int short_pitch = pitch >> 1;
int i, j;
int16_t temp_in[32], temp_out[32];
// First transform rows
for (i = 0; i < 32; ++i) {
idct32_1d(input, outptr);
input += short_pitch;
outptr += 32;
}
// Then transform columns
for (i = 0; i < 32; ++i) {
for (j = 0; j < 32; ++j)
temp_in[j] = out[j * 32 + i];
idct32_1d(temp_in, temp_out);
for (j = 0; j < 32; ++j)
output[j * 32 + i] = (temp_out[j] + 32) >> 6;
}
}
void vp9_short_idct1_32x32_c(int16_t *input, int16_t *output) {
int tmp;
int16_t out;
tmp = input[0] * cospi_16_64;
out = dct_const_round_shift(tmp);
tmp = out * cospi_16_64;
out = dct_const_round_shift(tmp);
*output = (out + 32) >> 6;
}