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android / platform / external / libaom / 5ebe94f9f / . / vp9 / common / vp9_idctllm.c
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/*
* 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"
static const int cospi8sqrt2minus1 = 20091;
static const int sinpi8sqrt2 = 35468;
static const int rounding = 0;
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
};
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
};
/* Converted the transforms to integer form. */
#define VERTICAL_SHIFT 14 // 16
#define VERTICAL_ROUNDING ((1 << (VERTICAL_SHIFT - 1)) - 1)
#define HORIZONTAL_SHIFT 17 // 15
#define HORIZONTAL_ROUNDING ((1 << (HORIZONTAL_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;
}
}
}
/* vertical 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 += ptv[k] * ip[(k * tx_dim)];
}
im[i] = (int16_t)((temp + VERTICAL_ROUNDING) >> VERTICAL_SHIFT);
ip++;
}
im += tx_dim; // 16
ptv += tx_dim;
ip = input;
}
/* horizontal transformation */
im = &imbuf[0];
for (j = 0; j < tx_dim; j++) {
const int16_t *pthc = pth;
for (i = 0; i < tx_dim; i++) {
int temp = 0;
for (k = 0; k < nz_dim; k++) {
temp += im[k] * pthc[k];
}
op[i] = (int16_t)((temp + HORIZONTAL_ROUNDING) >> HORIZONTAL_SHIFT);
pthc += tx_dim;
}
im += tx_dim; // 16
op += shortpitch;
}
}
void vp9_short_idct4x4llm_c(short *input, short *output, int pitch) {
int i;
int a1, b1, c1, d1;
short *ip = input;
short *op = output;
int temp1, temp2;
int shortpitch = pitch >> 1;
for (i = 0; i < 4; i++) {
a1 = ip[0] + ip[8];
b1 = ip[0] - ip[8];
temp1 = (ip[4] * sinpi8sqrt2 + rounding) >> 16;
temp2 = ip[12] + ((ip[12] * cospi8sqrt2minus1 + rounding) >> 16);
c1 = temp1 - temp2;
temp1 = ip[4] + ((ip[4] * cospi8sqrt2minus1 + rounding) >> 16);
temp2 = (ip[12] * sinpi8sqrt2 + rounding) >> 16;
d1 = temp1 + temp2;
op[shortpitch * 0] = a1 + d1;
op[shortpitch * 3] = a1 - d1;
op[shortpitch * 1] = b1 + c1;
op[shortpitch * 2] = b1 - c1;
ip++;
op++;
}
ip = output;
op = output;
for (i = 0; i < 4; i++) {
a1 = ip[0] + ip[2];
b1 = ip[0] - ip[2];
temp1 = (ip[1] * sinpi8sqrt2 + rounding) >> 16;
temp2 = ip[3] + ((ip[3] * cospi8sqrt2minus1 + rounding) >> 16);
c1 = temp1 - temp2;
temp1 = ip[1] + ((ip[1] * cospi8sqrt2minus1 + rounding) >> 16);
temp2 = (ip[3] * sinpi8sqrt2 + rounding) >> 16;
d1 = temp1 + temp2;
op[0] = (a1 + d1 + 16) >> 5;
op[3] = (a1 - d1 + 16) >> 5;
op[1] = (b1 + c1 + 16) >> 5;
op[2] = (b1 - c1 + 16) >> 5;
ip += shortpitch;
op += shortpitch;
}
}
void vp9_short_idct4x4llm_1_c(short *input, short *output, int pitch) {
int i;
int a1;
short *op = output;
int shortpitch = pitch >> 1;
a1 = ((input[0] + 16) >> 5);
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(short input_dc, unsigned char *pred_ptr,
unsigned char *dst_ptr, int pitch, int stride) {
int a1 = ((input_dc + 16) >> 5);
int r, c;
for (r = 0; r < 4; r++) {
for (c = 0; c < 4; c++) {
int a = a1 + pred_ptr[c];
if (a < 0)
a = 0;
if (a > 255)
a = 255;
dst_ptr[c] = (unsigned char) a;
}
dst_ptr += stride;
pred_ptr += pitch;
}
}
void vp9_short_inv_walsh4x4_c(short *input, short *output) {
int i;
int a1, b1, c1, d1;
short *ip = input;
short *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(short *in, short *out) {
int i;
short tmp[4];
short *ip = in;
short *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(short *input, short *output) {
int i;
int a1, b1, c1, d1;
short *ip = input;
short *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(short *in, short *out) {
int i;
short tmp[4];
short *ip = in;
short *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(short *input, short *output, int pitch) {
int i;
int a1, b1, c1, d1;
short *ip = input;
short *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(short *in, short *out, int pitch) {
int i;
short tmp[4];
short *ip = in;
short *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(short input_dc, unsigned char *pred_ptr,
unsigned char *dst_ptr,
int pitch, int stride) {
int r, c;
short tmp[16];
vp9_short_inv_walsh4x4_1_x8_c(&input_dc, tmp, 4 << 1);
for (r = 0; r < 4; r++) {
for (c = 0; c < 4; c++) {
int a = tmp[r * 4 + c] + pred_ptr[c];
if (a < 0)
a = 0;
if (a > 255)
a = 255;
dst_ptr[c] = (unsigned char) a;
}
dst_ptr += stride;
pred_ptr += pitch;
}
}
#endif
void vp9_dc_only_idct_add_8x8_c(short input_dc,
unsigned char *pred_ptr,
unsigned char *dst_ptr,
int pitch, int stride) {
int a1 = ((input_dc + 16) >> 5);
int r, c, b;
unsigned char *orig_pred = pred_ptr;
unsigned char *orig_dst = dst_ptr;
for (b = 0; b < 4; b++) {
for (r = 0; r < 4; r++) {
for (c = 0; c < 4; c++) {
int a = a1 + pred_ptr[c];
if (a < 0)
a = 0;
if (a > 255)
a = 255;
dst_ptr[c] = (unsigned char) a;
}
dst_ptr += stride;
pred_ptr += pitch;
}
dst_ptr = orig_dst + (b + 1) % 2 * 4 + (b + 1) / 2 * 4 * stride;
pred_ptr = orig_pred + (b + 1) % 2 * 4 + (b + 1) / 2 * 4 * pitch;
}
}
#define W1 2841 /* 2048*sqrt(2)*cos(1*pi/16) */
#define W2 2676 /* 2048*sqrt(2)*cos(2*pi/16) */
#define W3 2408 /* 2048*sqrt(2)*cos(3*pi/16) */
#define W5 1609 /* 2048*sqrt(2)*cos(5*pi/16) */
#define W6 1108 /* 2048*sqrt(2)*cos(6*pi/16) */
#define W7 565 /* 2048*sqrt(2)*cos(7*pi/16) */
/* row (horizontal) IDCT
*
* 7 pi 1 dst[k] = sum c[l] * src[l] * cos( -- *
* ( k + - ) * l ) l=0 8 2
*
* where: c[0] = 128 c[1..7] = 128*sqrt(2) */
static void idctrow(int *blk) {
int x0, x1, x2, x3, x4, x5, x6, x7, x8;
/* shortcut */
if (!((x1 = blk[4] << 11) | (x2 = blk[6]) | (x3 = blk[2]) |
(x4 = blk[1]) | (x5 = blk[7]) | (x6 = blk[5]) | (x7 = blk[3]))) {
blk[0] = blk[1] = blk[2] = blk[3] = blk[4]
= blk[5] = blk[6] = blk[7] = blk[0] << 3;
return;
}
x0 = (blk[0] << 11) + 128; /* for proper rounding in the fourth stage */
/* first stage */
x8 = W7 * (x4 + x5);
x4 = x8 + (W1 - W7) * x4;
x5 = x8 - (W1 + W7) * x5;
x8 = W3 * (x6 + x7);
x6 = x8 - (W3 - W5) * x6;
x7 = x8 - (W3 + W5) * x7;
/* second stage */
x8 = x0 + x1;
x0 -= x1;
x1 = W6 * (x3 + x2);
x2 = x1 - (W2 + W6) * x2;
x3 = x1 + (W2 - W6) * x3;
x1 = x4 + x6;
x4 -= x6;
x6 = x5 + x7;
x5 -= x7;
/* third stage */
x7 = x8 + x3;
x8 -= x3;
x3 = x0 + x2;
x0 -= x2;
x2 = (181 * (x4 + x5) + 128) >> 8;
x4 = (181 * (x4 - x5) + 128) >> 8;
/* fourth stage */
blk[0] = (x7 + x1) >> 8;
blk[1] = (x3 + x2) >> 8;
blk[2] = (x0 + x4) >> 8;
blk[3] = (x8 + x6) >> 8;
blk[4] = (x8 - x6) >> 8;
blk[5] = (x0 - x4) >> 8;
blk[6] = (x3 - x2) >> 8;
blk[7] = (x7 - x1) >> 8;
}
/* column (vertical) IDCT
*
* 7 pi 1 dst[8*k] = sum c[l] * src[8*l] *
* cos( -- * ( k + - ) * l ) l=0 8 2
*
* where: c[0] = 1/1024 c[1..7] = (1/1024)*sqrt(2) */
static void idctcol(int *blk) {
int x0, x1, x2, x3, x4, x5, x6, x7, x8;
/* shortcut */
if (!((x1 = (blk[8 * 4] << 8)) | (x2 = blk[8 * 6]) | (x3 = blk[8 * 2]) |
(x4 = blk[8 * 1]) | (x5 = blk[8 * 7]) | (x6 = blk[8 * 5]) |
(x7 = blk[8 * 3]))) {
blk[8 * 0] = blk[8 * 1] = blk[8 * 2] = blk[8 * 3]
= blk[8 * 4] = blk[8 * 5] = blk[8 * 6]
= blk[8 * 7] = ((blk[8 * 0] + 32) >> 6);
return;
}
x0 = (blk[8 * 0] << 8) + 16384;
/* first stage */
x8 = W7 * (x4 + x5) + 4;
x4 = (x8 + (W1 - W7) * x4) >> 3;
x5 = (x8 - (W1 + W7) * x5) >> 3;
x8 = W3 * (x6 + x7) + 4;
x6 = (x8 - (W3 - W5) * x6) >> 3;
x7 = (x8 - (W3 + W5) * x7) >> 3;
/* second stage */
x8 = x0 + x1;
x0 -= x1;
x1 = W6 * (x3 + x2) + 4;
x2 = (x1 - (W2 + W6) * x2) >> 3;
x3 = (x1 + (W2 - W6) * x3) >> 3;
x1 = x4 + x6;
x4 -= x6;
x6 = x5 + x7;
x5 -= x7;
/* third stage */
x7 = x8 + x3;
x8 -= x3;
x3 = x0 + x2;
x0 -= x2;
x2 = (181 * (x4 + x5) + 128) >> 8;
x4 = (181 * (x4 - x5) + 128) >> 8;
/* fourth stage */
blk[8 * 0] = (x7 + x1) >> 14;
blk[8 * 1] = (x3 + x2) >> 14;
blk[8 * 2] = (x0 + x4) >> 14;
blk[8 * 3] = (x8 + x6) >> 14;
blk[8 * 4] = (x8 - x6) >> 14;
blk[8 * 5] = (x0 - x4) >> 14;
blk[8 * 6] = (x3 - x2) >> 14;
blk[8 * 7] = (x7 - x1) >> 14;
}
#define TX_DIM 8
void vp9_short_idct8x8_c(short *coefs, short *block, int pitch) {
int X[TX_DIM * TX_DIM];
int i, j;
int shortpitch = pitch >> 1;
for (i = 0; i < TX_DIM; i++) {
for (j = 0; j < TX_DIM; j++) {
X[i * TX_DIM + j] = (int)(coefs[i * TX_DIM + j] + 1
+ (coefs[i * TX_DIM + j] < 0)) >> 2;
}
}
for (i = 0; i < 8; i++)
idctrow(X + 8 * i);
for (i = 0; i < 8; i++)
idctcol(X + i);
for (i = 0; i < TX_DIM; i++) {
for (j = 0; j < TX_DIM; j++) {
block[i * shortpitch + j] = X[i * TX_DIM + j] >> 1;
}
}
}
/* Row IDCT when only first 4 coefficients are non-zero. */
static void idctrow10(int *blk) {
int x0, x1, x2, x3, x4, x5, x6, x7, x8;
/* shortcut */
if (!((x1 = blk[4] << 11) | (x2 = blk[6]) | (x3 = blk[2]) |
(x4 = blk[1]) | (x5 = blk[7]) | (x6 = blk[5]) | (x7 = blk[3]))) {
blk[0] = blk[1] = blk[2] = blk[3] = blk[4]
= blk[5] = blk[6] = blk[7] = blk[0] << 3;
return;
}
x0 = (blk[0] << 11) + 128; /* for proper rounding in the fourth stage */
/* first stage */
x5 = W7 * x4;
x4 = W1 * x4;
x6 = W3 * x7;
x7 = -W5 * x7;
/* second stage */
x2 = W6 * x3;
x3 = W2 * x3;
x1 = x4 + x6;
x4 -= x6;
x6 = x5 + x7;
x5 -= x7;
/* third stage */
x7 = x0 + x3;
x8 = x0 - x3;
x3 = x0 + x2;
x0 -= x2;
x2 = (181 * (x4 + x5) + 128) >> 8;
x4 = (181 * (x4 - x5) + 128) >> 8;
/* fourth stage */
blk[0] = (x7 + x1) >> 8;
blk[1] = (x3 + x2) >> 8;
blk[2] = (x0 + x4) >> 8;
blk[3] = (x8 + x6) >> 8;
blk[4] = (x8 - x6) >> 8;
blk[5] = (x0 - x4) >> 8;
blk[6] = (x3 - x2) >> 8;
blk[7] = (x7 - x1) >> 8;
}
/* Column (vertical) IDCT when only first 4 coefficients are non-zero. */
static void idctcol10(int *blk) {
int x0, x1, x2, x3, x4, x5, x6, x7, x8;
/* shortcut */
if (!((x1 = (blk[8 * 4] << 8)) | (x2 = blk[8 * 6]) | (x3 = blk[8 * 2]) |
(x4 = blk[8 * 1]) | (x5 = blk[8 * 7]) | (x6 = blk[8 * 5]) |
(x7 = blk[8 * 3]))) {
blk[8 * 0] = blk[8 * 1] = blk[8 * 2] = blk[8 * 3]
= blk[8 * 4] = blk[8 * 5] = blk[8 * 6]
= blk[8 * 7] = ((blk[8 * 0] + 32) >> 6);
return;
}
x0 = (blk[8 * 0] << 8) + 16384;
/* first stage */
x5 = (W7 * x4 + 4) >> 3;
x4 = (W1 * x4 + 4) >> 3;
x6 = (W3 * x7 + 4) >> 3;
x7 = (-W5 * x7 + 4) >> 3;
/* second stage */
x2 = (W6 * x3 + 4) >> 3;
x3 = (W2 * x3 + 4) >> 3;
x1 = x4 + x6;
x4 -= x6;
x6 = x5 + x7;
x5 -= x7;
/* third stage */
x7 = x0 + x3;
x8 = x0 - x3;
x3 = x0 + x2;
x0 -= x2;
x2 = (181 * (x4 + x5) + 128) >> 8;
x4 = (181 * (x4 - x5) + 128) >> 8;
/* fourth stage */
blk[8 * 0] = (x7 + x1) >> 14;
blk[8 * 1] = (x3 + x2) >> 14;
blk[8 * 2] = (x0 + x4) >> 14;
blk[8 * 3] = (x8 + x6) >> 14;
blk[8 * 4] = (x8 - x6) >> 14;
blk[8 * 5] = (x0 - x4) >> 14;
blk[8 * 6] = (x3 - x2) >> 14;
blk[8 * 7] = (x7 - x1) >> 14;
}
void vp9_short_idct10_8x8_c(short *coefs, short *block, int pitch) {
int X[TX_DIM * TX_DIM];
int i, j;
int shortpitch = pitch >> 1;
for (i = 0; i < TX_DIM; i++) {
for (j = 0; j < TX_DIM; j++) {
X[i * TX_DIM + j] = (int)(coefs[i * TX_DIM + j] + 1
+ (coefs[i * TX_DIM + j] < 0)) >> 2;
}
}
/* Do first 4 row idct only since non-zero dct coefficients are all in
* upper-left 4x4 area. */
for (i = 0; i < 4; i++)
idctrow10(X + 8 * i);
for (i = 0; i < 8; i++)
idctcol10(X + i);
for (i = 0; i < TX_DIM; i++) {
for (j = 0; j < TX_DIM; j++) {
block[i * shortpitch + j] = X[i * TX_DIM + j] >> 1;
}
}
}
void vp9_short_ihaar2x2_c(short *input, short *output, int pitch) {
int i;
short *ip = input; // 0,1, 4, 8
short *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;
}
#if 0
// Keep a really bad float version as reference for now.
void vp9_short_idct16x16_c(short *input, short *output, int pitch) {
vp9_clear_system_state(); // Make it simd safe : __asm emms;
{
double x;
const int short_pitch = pitch >> 1;
int i, j, k, l;
for (l = 0; l < 16; ++l) {
for (k = 0; k < 16; ++k) {
double s = 0;
for (i = 0; i < 16; ++i) {
for (j = 0; j < 16; ++j) {
x=cos(PI*j*(l+0.5)/16.0)*cos(PI*i*(k+0.5)/16.0)*input[i*16+j]/32;
if (i != 0)
x *= sqrt(2.0);
if (j != 0)
x *= sqrt(2.0);
s += x;
}
}
output[k*short_pitch+l] = (short)round(s);
}
}
}
vp9_clear_system_state(); // Make it simd safe : __asm emms;
}
#endif
#define TEST_INT_16x16_IDCT 1
#if !TEST_INT_16x16_IDCT
static const double C1 = 0.995184726672197;
static const double C2 = 0.98078528040323;
static const double C3 = 0.956940335732209;
static const double C4 = 0.923879532511287;
static const double C5 = 0.881921264348355;
static const double C6 = 0.831469612302545;
static const double C7 = 0.773010453362737;
static const double C8 = 0.707106781186548;
static const double C9 = 0.634393284163646;
static const double C10 = 0.555570233019602;
static const double C11 = 0.471396736825998;
static const double C12 = 0.38268343236509;
static const double C13 = 0.290284677254462;
static const double C14 = 0.195090322016128;
static const double C15 = 0.098017140329561;
static void butterfly_16x16_idct_1d(double input[16], double output[16]) {
vp9_clear_system_state(); // Make it simd safe : __asm emms;
{
double step[16];
double intermediate[16];
double temp1, temp2;
// step 1 and 2
step[ 0] = input[0] + input[8];
step[ 1] = input[0] - input[8];
temp1 = input[4]*C12;
temp2 = input[12]*C4;
temp1 -= temp2;
temp1 *= C8;
step[ 2] = 2*(temp1);
temp1 = input[4]*C4;
temp2 = input[12]*C12;
temp1 += temp2;
temp1 = (temp1);
temp1 *= C8;
step[ 3] = 2*(temp1);
temp1 = input[2]*C8;
temp1 = 2*(temp1);
temp2 = input[6] + input[10];
step[ 4] = temp1 + temp2;
step[ 5] = temp1 - temp2;
temp1 = input[14]*C8;
temp1 = 2*(temp1);
temp2 = input[6] - input[10];
step[ 6] = temp2 - temp1;
step[ 7] = temp2 + temp1;
// for odd input
temp1 = input[3]*C12;
temp2 = input[13]*C4;
temp1 += temp2;
temp1 = (temp1);
temp1 *= C8;
intermediate[ 8] = 2*(temp1);
temp1 = input[3]*C4;
temp2 = input[13]*C12;
temp2 -= temp1;
temp2 = (temp2);
temp2 *= C8;
intermediate[ 9] = 2*(temp2);
intermediate[10] = 2*(input[9]*C8);
intermediate[11] = input[15] - input[1];
intermediate[12] = input[15] + input[1];
intermediate[13] = 2*((input[7]*C8));
temp1 = input[11]*C12;
temp2 = input[5]*C4;
temp2 -= temp1;
temp2 = (temp2);
temp2 *= C8;
intermediate[14] = 2*(temp2);
temp1 = input[11]*C4;
temp2 = input[5]*C12;
temp1 += temp2;
temp1 = (temp1);
temp1 *= C8;
intermediate[15] = 2*(temp1);
step[ 8] = intermediate[ 8] + intermediate[14];
step[ 9] = intermediate[ 9] + intermediate[15];
step[10] = intermediate[10] + intermediate[11];
step[11] = intermediate[10] - intermediate[11];
step[12] = intermediate[12] + intermediate[13];
step[13] = intermediate[12] - intermediate[13];
step[14] = intermediate[ 8] - intermediate[14];
step[15] = intermediate[ 9] - intermediate[15];
// step 3
output[0] = step[ 0] + step[ 3];
output[1] = step[ 1] + step[ 2];
output[2] = step[ 1] - step[ 2];
output[3] = step[ 0] - step[ 3];
temp1 = step[ 4]*C14;
temp2 = step[ 7]*C2;
temp1 -= temp2;
output[4] = (temp1);
temp1 = step[ 4]*C2;
temp2 = step[ 7]*C14;
temp1 += temp2;
output[7] = (temp1);
temp1 = step[ 5]*C10;
temp2 = step[ 6]*C6;
temp1 -= temp2;
output[5] = (temp1);
temp1 = step[ 5]*C6;
temp2 = step[ 6]*C10;
temp1 += temp2;
output[6] = (temp1);
output[8] = step[ 8] + step[11];
output[9] = step[ 9] + step[10];
output[10] = step[ 9] - step[10];
output[11] = step[ 8] - step[11];
output[12] = step[12] + step[15];
output[13] = step[13] + step[14];
output[14] = step[13] - step[14];
output[15] = step[12] - step[15];
// output 4
step[ 0] = output[0] + output[7];
step[ 1] = output[1] + output[6];
step[ 2] = output[2] + output[5];
step[ 3] = output[3] + output[4];
step[ 4] = output[3] - output[4];
step[ 5] = output[2] - output[5];
step[ 6] = output[1] - output[6];
step[ 7] = output[0] - output[7];
temp1 = output[8]*C7;
temp2 = output[15]*C9;
temp1 -= temp2;
step[ 8] = (temp1);
temp1 = output[9]*C11;
temp2 = output[14]*C5;
temp1 += temp2;
step[ 9] = (temp1);
temp1 = output[10]*C3;
temp2 = output[13]*C13;
temp1 -= temp2;
step[10] = (temp1);
temp1 = output[11]*C15;
temp2 = output[12]*C1;
temp1 += temp2;
step[11] = (temp1);
temp1 = output[11]*C1;
temp2 = output[12]*C15;
temp2 -= temp1;
step[12] = (temp2);
temp1 = output[10]*C13;
temp2 = output[13]*C3;
temp1 += temp2;
step[13] = (temp1);
temp1 = output[9]*C5;
temp2 = output[14]*C11;
temp2 -= temp1;
step[14] = (temp2);
temp1 = output[8]*C9;
temp2 = output[15]*C7;
temp1 += temp2;
step[15] = (temp1);
// step 5
output[0] = (step[0] + step[15]);
output[1] = (step[1] + step[14]);
output[2] = (step[2] + step[13]);
output[3] = (step[3] + step[12]);
output[4] = (step[4] + step[11]);
output[5] = (step[5] + step[10]);
output[6] = (step[6] + step[ 9]);
output[7] = (step[7] + step[ 8]);
output[15] = (step[0] - step[15]);
output[14] = (step[1] - step[14]);
output[13] = (step[2] - step[13]);
output[12] = (step[3] - step[12]);
output[11] = (step[4] - step[11]);
output[10] = (step[5] - step[10]);
output[9] = (step[6] - step[ 9]);
output[8] = (step[7] - step[ 8]);
}
vp9_clear_system_state(); // Make it simd safe : __asm emms;
}
// Remove once an int version of iDCT is written
#if 0
void reference_16x16_idct_1d(double input[16], double output[16]) {
vp9_clear_system_state(); // Make it simd safe : __asm emms;
{
const double kPi = 3.141592653589793238462643383279502884;
const double kSqrt2 = 1.414213562373095048801688724209698;
for (int k = 0; k < 16; k++) {
output[k] = 0.0;
for (int n = 0; n < 16; n++) {
output[k] += input[n]*cos(kPi*(2*k+1)*n/32.0);
if (n == 0)
output[k] = output[k]/kSqrt2;
}
}
}
vp9_clear_system_state(); // Make it simd safe : __asm emms;
}
#endif
void vp9_short_idct16x16_c(short *input, short *output, int pitch) {
vp9_clear_system_state(); // Make it simd safe : __asm emms;
{
double out[16*16], out2[16*16];
const int short_pitch = pitch >> 1;
int i, j;
// First transform rows
for (i = 0; i < 16; ++i) {
double temp_in[16], temp_out[16];
for (j = 0; j < 16; ++j)
temp_in[j] = input[j + i*short_pitch];
butterfly_16x16_idct_1d(temp_in, temp_out);
for (j = 0; j < 16; ++j)
out[j + i*16] = temp_out[j];
}
// Then transform columns
for (i = 0; i < 16; ++i) {
double temp_in[16], temp_out[16];
for (j = 0; j < 16; ++j)
temp_in[j] = out[j*16 + i];
butterfly_16x16_idct_1d(temp_in, temp_out);
for (j = 0; j < 16; ++j)
out2[j*16 + i] = temp_out[j];
}
for (i = 0; i < 16*16; ++i)
output[i] = round(out2[i]/128);
}
vp9_clear_system_state(); // Make it simd safe : __asm emms;
}
#else
static const int16_t C1 = 16305;
static const int16_t C2 = 16069;
static const int16_t C3 = 15679;
static const int16_t C4 = 15137;
static const int16_t C5 = 14449;
static const int16_t C6 = 13623;
static const int16_t C7 = 12665;
static const int16_t C8 = 11585;
static const int16_t C9 = 10394;
static const int16_t C10 = 9102;
static const int16_t C11 = 7723;
static const int16_t C12 = 6270;
static const int16_t C13 = 4756;
static const int16_t C14 = 3196;
static const int16_t C15 = 1606;
#define INITIAL_SHIFT 2
#define INITIAL_ROUNDING (1 << (INITIAL_SHIFT - 1))
#define RIGHT_SHIFT 14
#define RIGHT_ROUNDING (1 << (RIGHT_SHIFT - 1))
static void butterfly_16x16_idct_1d(int16_t input[16], int16_t output[16],
int last_shift_bits) {
int16_t step[16];
int intermediate[16];
int temp1, temp2;
int step1_shift = RIGHT_SHIFT + INITIAL_SHIFT;
int step1_rounding = 1 << (step1_shift - 1);
int last_rounding = 0;
if (last_shift_bits > 0)
last_rounding = 1 << (last_shift_bits - 1);
// step 1 and 2
step[ 0] = (input[0] + input[8] + INITIAL_ROUNDING) >> INITIAL_SHIFT;
step[ 1] = (input[0] - input[8] + INITIAL_ROUNDING) >> INITIAL_SHIFT;
temp1 = input[4] * C12;
temp2 = input[12] * C4;
temp1 = (temp1 - temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 *= C8;
step[ 2] = (2 * (temp1) + step1_rounding) >> step1_shift;
temp1 = input[4] * C4;
temp2 = input[12] * C12;
temp1 = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 *= C8;
step[ 3] = (2 * (temp1) + step1_rounding) >> step1_shift;
temp1 = input[2] * C8;
temp1 = (2 * (temp1) + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp2 = input[6] + input[10];
step[ 4] = (temp1 + temp2 + INITIAL_ROUNDING) >> INITIAL_SHIFT;
step[ 5] = (temp1 - temp2 + INITIAL_ROUNDING) >> INITIAL_SHIFT;
temp1 = input[14] * C8;
temp1 = (2 * (temp1) + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp2 = input[6] - input[10];
step[ 6] = (temp2 - temp1 + INITIAL_ROUNDING) >> INITIAL_SHIFT;
step[ 7] = (temp2 + temp1 + INITIAL_ROUNDING) >> INITIAL_SHIFT;
// for odd input
temp1 = input[3] * C12;
temp2 = input[13] * C4;
temp1 = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 *= C8;
intermediate[ 8] = (2 * (temp1) + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = input[3] * C4;
temp2 = input[13] * C12;
temp2 = (temp2 - temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp2 *= C8;
intermediate[ 9] = (2 * (temp2) + RIGHT_ROUNDING) >> RIGHT_SHIFT;
intermediate[10] = (2 * (input[9] * C8) + RIGHT_ROUNDING) >> RIGHT_SHIFT;
intermediate[11] = input[15] - input[1];
intermediate[12] = input[15] + input[1];
intermediate[13] = (2 * (input[7] * C8) + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = input[11] * C12;
temp2 = input[5] * C4;
temp2 = (temp2 - temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp2 *= C8;
intermediate[14] = (2 * (temp2) + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = input[11] * C4;
temp2 = input[5] * C12;
temp1 = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 *= C8;
intermediate[15] = (2 * (temp1) + RIGHT_ROUNDING) >> RIGHT_SHIFT;
step[ 8] = (intermediate[ 8] + intermediate[14] + INITIAL_ROUNDING)
>> INITIAL_SHIFT;
step[ 9] = (intermediate[ 9] + intermediate[15] + INITIAL_ROUNDING)
>> INITIAL_SHIFT;
step[10] = (intermediate[10] + intermediate[11] + INITIAL_ROUNDING)
>> INITIAL_SHIFT;
step[11] = (intermediate[10] - intermediate[11] + INITIAL_ROUNDING)
>> INITIAL_SHIFT;
step[12] = (intermediate[12] + intermediate[13] + INITIAL_ROUNDING)
>> INITIAL_SHIFT;
step[13] = (intermediate[12] - intermediate[13] + INITIAL_ROUNDING)
>> INITIAL_SHIFT;
step[14] = (intermediate[ 8] - intermediate[14] + INITIAL_ROUNDING)
>> INITIAL_SHIFT;
step[15] = (intermediate[ 9] - intermediate[15] + INITIAL_ROUNDING)
>> INITIAL_SHIFT;
// step 3
output[0] = step[ 0] + step[ 3];
output[1] = step[ 1] + step[ 2];
output[2] = step[ 1] - step[ 2];
output[3] = step[ 0] - step[ 3];
temp1 = step[ 4] * C14;
temp2 = step[ 7] * C2;
output[4] = (temp1 - temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = step[ 4] * C2;
temp2 = step[ 7] * C14;
output[7] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = step[ 5] * C10;
temp2 = step[ 6] * C6;
output[5] = (temp1 - temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = step[ 5] * C6;
temp2 = step[ 6] * C10;
output[6] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
output[8] = step[ 8] + step[11];
output[9] = step[ 9] + step[10];
output[10] = step[ 9] - step[10];
output[11] = step[ 8] - step[11];
output[12] = step[12] + step[15];
output[13] = step[13] + step[14];
output[14] = step[13] - step[14];
output[15] = step[12] - step[15];
// output 4
step[ 0] = output[0] + output[7];
step[ 1] = output[1] + output[6];
step[ 2] = output[2] + output[5];
step[ 3] = output[3] + output[4];
step[ 4] = output[3] - output[4];
step[ 5] = output[2] - output[5];
step[ 6] = output[1] - output[6];
step[ 7] = output[0] - output[7];
temp1 = output[8] * C7;
temp2 = output[15] * C9;
step[ 8] = (temp1 - temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = output[9] * C11;
temp2 = output[14] * C5;
step[ 9] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = output[10] * C3;
temp2 = output[13] * C13;
step[10] = (temp1 - temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = output[11] * C15;
temp2 = output[12] * C1;
step[11] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = output[11] * C1;
temp2 = output[12] * C15;
step[12] = (temp2 - temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = output[10] * C13;
temp2 = output[13] * C3;
step[13] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = output[9] * C5;
temp2 = output[14] * C11;
step[14] = (temp2 - temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = output[8] * C9;
temp2 = output[15] * C7;
step[15] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
// step 5
output[0] = (step[0] + step[15] + last_rounding) >> last_shift_bits;
output[1] = (step[1] + step[14] + last_rounding) >> last_shift_bits;
output[2] = (step[2] + step[13] + last_rounding) >> last_shift_bits;
output[3] = (step[3] + step[12] + last_rounding) >> last_shift_bits;
output[4] = (step[4] + step[11] + last_rounding) >> last_shift_bits;
output[5] = (step[5] + step[10] + last_rounding) >> last_shift_bits;
output[6] = (step[6] + step[ 9] + last_rounding) >> last_shift_bits;
output[7] = (step[7] + step[ 8] + last_rounding) >> last_shift_bits;
output[15] = (step[0] - step[15] + last_rounding) >> last_shift_bits;
output[14] = (step[1] - step[14] + last_rounding) >> last_shift_bits;
output[13] = (step[2] - step[13] + last_rounding) >> last_shift_bits;
output[12] = (step[3] - step[12] + last_rounding) >> last_shift_bits;
output[11] = (step[4] - step[11] + last_rounding) >> last_shift_bits;
output[10] = (step[5] - step[10] + last_rounding) >> last_shift_bits;
output[9] = (step[6] - step[ 9] + last_rounding) >> last_shift_bits;
output[8] = (step[7] - step[ 8] + last_rounding) >> last_shift_bits;
}
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) {
butterfly_16x16_idct_1d(input, outptr, 0);
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];
butterfly_16x16_idct_1d(temp_in, temp_out, 3);
for (j = 0; j < 16; ++j)
output[j * 16 + i] = temp_out[j];
}
}
/* The following function is called when we know the maximum number of non-zero
* dct coefficients is less or equal 10.
*/
static void butterfly_16x16_idct10_1d(int16_t input[16], int16_t output[16],
int last_shift_bits) {
int16_t step[16] = {0};
int intermediate[16] = {0};
int temp1, temp2;
int last_rounding = 0;
if (last_shift_bits > 0)
last_rounding = 1 << (last_shift_bits - 1);
// step 1 and 2
step[ 0] = (input[0] + INITIAL_ROUNDING) >> INITIAL_SHIFT;
step[ 1] = (input[0] + INITIAL_ROUNDING) >> INITIAL_SHIFT;
temp1 = (2 * (input[2] * C8) + RIGHT_ROUNDING) >> RIGHT_SHIFT;
step[ 4] = (temp1 + INITIAL_ROUNDING) >> INITIAL_SHIFT;
step[ 5] = (temp1 + INITIAL_ROUNDING) >> INITIAL_SHIFT;
// for odd input
temp1 = (input[3] * C12 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 *= C8;
intermediate[ 8] = (2 * (temp1) + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = (-input[3] * C4 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 *= C8;
intermediate[ 9] = (2 * (temp1) + RIGHT_ROUNDING) >> RIGHT_SHIFT;
step[ 8] = (intermediate[ 8] + INITIAL_ROUNDING) >> INITIAL_SHIFT;
step[ 9] = (intermediate[ 9] + INITIAL_ROUNDING) >> INITIAL_SHIFT;
step[10] = (-input[1] + INITIAL_ROUNDING) >> INITIAL_SHIFT;
step[11] = (input[1] + INITIAL_ROUNDING) >> INITIAL_SHIFT;
step[12] = (input[1] + INITIAL_ROUNDING) >> INITIAL_SHIFT;
step[13] = (input[1] + INITIAL_ROUNDING) >> INITIAL_SHIFT;
step[14] = (intermediate[ 8] + INITIAL_ROUNDING) >> INITIAL_SHIFT;
step[15] = (intermediate[ 9] + INITIAL_ROUNDING) >> INITIAL_SHIFT;
// step 3
output[0] = step[ 0];
output[1] = step[ 1];
output[2] = step[ 1];
output[3] = step[ 0];
temp1 = step[ 4] * C14;
output[4] = (temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = step[ 4] * C2;
output[7] = (temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = step[ 5] * C10;
output[5] = (temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = step[ 5] * C6;
output[6] = (temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
output[8] = step[ 8] + step[11];
output[9] = step[ 9] + step[10];
output[10] = step[ 9] - step[10];
output[11] = step[ 8] - step[11];
output[12] = step[12] + step[15];
output[13] = step[13] + step[14];
output[14] = step[13] - step[14];
output[15] = step[12] - step[15];
// output 4
step[ 0] = output[0] + output[7];
step[ 1] = output[1] + output[6];
step[ 2] = output[2] + output[5];
step[ 3] = output[3] + output[4];
step[ 4] = output[3] - output[4];
step[ 5] = output[2] - output[5];
step[ 6] = output[1] - output[6];
step[ 7] = output[0] - output[7];
temp1 = output[8] * C7;
temp2 = output[15] * C9;
step[ 8] = (temp1 - temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = output[9] * C11;
temp2 = output[14] * C5;
step[ 9] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = output[10] * C3;
temp2 = output[13] * C13;
step[10] = (temp1 - temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = output[11] * C15;
temp2 = output[12] * C1;
step[11] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = output[11] * C1;
temp2 = output[12] * C15;
step[12] = (temp2 - temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = output[10] * C13;
temp2 = output[13] * C3;
step[13] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = output[9] * C5;
temp2 = output[14] * C11;
step[14] = (temp2 - temp1 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
temp1 = output[8] * C9;
temp2 = output[15] * C7;
step[15] = (temp1 + temp2 + RIGHT_ROUNDING) >> RIGHT_SHIFT;
// step 5
output[0] = (step[0] + step[15] + last_rounding) >> last_shift_bits;
output[1] = (step[1] + step[14] + last_rounding) >> last_shift_bits;
output[2] = (step[2] + step[13] + last_rounding) >> last_shift_bits;
output[3] = (step[3] + step[12] + last_rounding) >> last_shift_bits;
output[4] = (step[4] + step[11] + last_rounding) >> last_shift_bits;
output[5] = (step[5] + step[10] + last_rounding) >> last_shift_bits;
output[6] = (step[6] + step[ 9] + last_rounding) >> last_shift_bits;
output[7] = (step[7] + step[ 8] + last_rounding) >> last_shift_bits;
output[15] = (step[0] - step[15] + last_rounding) >> last_shift_bits;
output[14] = (step[1] - step[14] + last_rounding) >> last_shift_bits;
output[13] = (step[2] - step[13] + last_rounding) >> last_shift_bits;
output[12] = (step[3] - step[12] + last_rounding) >> last_shift_bits;
output[11] = (step[4] - step[11] + last_rounding) >> last_shift_bits;
output[10] = (step[5] - step[10] + last_rounding) >> last_shift_bits;
output[9] = (step[6] - step[ 9] + last_rounding) >> last_shift_bits;
output[8] = (step[7] - step[ 8] + last_rounding) >> last_shift_bits;
}
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) {
butterfly_16x16_idct10_1d(input, outptr, 0);
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];
butterfly_16x16_idct10_1d(temp_in, temp_out, 3);
for (j = 0; j < 16; ++j)
output[j*16 + i] = temp_out[j];
}
}
#undef INITIAL_SHIFT
#undef INITIAL_ROUNDING
#undef RIGHT_SHIFT
#undef RIGHT_ROUNDING
#endif