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/*
* Copyright (c) 2018, Alliance for Open Media. All rights reserved
*
* This source code is subject to the terms of the BSD 2 Clause License and
* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
* was not distributed with this source code in the LICENSE file, you can
* obtain it at www.aomedia.org/license/software. If the Alliance for Open
* Media Patent License 1.0 was not distributed with this source code in the
* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
*/
#include <assert.h>
#include <stdlib.h>
#include <math.h>
#include "config/av1_rtcd.h"
#include "av1/encoder/dwt.h"
// Note: block length must be even for this implementation
static void analysis_53_row(int length, tran_low_t *x, tran_low_t *lowpass,
tran_low_t *highpass) {
int n;
tran_low_t r, *a, *b;
n = length >> 1;
b = highpass;
a = lowpass;
while (--n) {
*a++ = (r = *x++) * 2;
*b++ = *x - ((r + x[1] + 1) >> 1);
x++;
}
*a = (r = *x++) * 2;
*b = *x - r;
n = length >> 1;
b = highpass;
a = lowpass;
r = *highpass;
while (n--) {
*a++ += (r + (*b) + 1) >> 1;
r = *b++;
}
}
static void analysis_53_col(int length, tran_low_t *x, tran_low_t *lowpass,
tran_low_t *highpass) {
int n;
tran_low_t r, *a, *b;
n = length >> 1;
b = highpass;
a = lowpass;
while (--n) {
*a++ = (r = *x++);
*b++ = (((*x) * 2) - (r + x[1]) + 2) >> 2;
x++;
}
*a = (r = *x++);
*b = (*x - r + 1) >> 1;
n = length >> 1;
b = highpass;
a = lowpass;
r = *highpass;
while (n--) {
*a++ += (r + (*b) + 1) >> 1;
r = *b++;
}
}
static void dyadic_analyze_53_uint8_input(int levels, int width, int height,
const uint8_t *x, int pitch_x,
tran_low_t *c, int pitch_c,
int dwt_scale_bits, int hbd) {
int lv, i, j, nh, nw, hh = height, hw = width;
tran_low_t buffer[2 * DWT_MAX_LENGTH];
if (hbd) {
const uint16_t *x16 = CONVERT_TO_SHORTPTR(x);
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
c[i * pitch_c + j] = x16[i * pitch_x + j] << dwt_scale_bits;
}
}
} else {
for (i = 0; i < height; i++) {
for (j = 0; j < width; j++) {
c[i * pitch_c + j] = x[i * pitch_x + j] << dwt_scale_bits;
}
}
}
for (lv = 0; lv < levels; lv++) {
nh = hh;
hh = (hh + 1) >> 1;
nw = hw;
hw = (hw + 1) >> 1;
if ((nh < 2) || (nw < 2)) return;
for (i = 0; i < nh; i++) {
memcpy(buffer, &c[i * pitch_c], nw * sizeof(tran_low_t));
analysis_53_row(nw, buffer, &c[i * pitch_c], &c[i * pitch_c] + hw);
}
for (j = 0; j < nw; j++) {
for (i = 0; i < nh; i++) buffer[i + nh] = c[i * pitch_c + j];
analysis_53_col(nh, buffer + nh, buffer, buffer + hh);
for (i = 0; i < nh; i++) c[i * pitch_c + j] = buffer[i];
}
}
}
void av1_fdwt8x8_uint8_input_c(const uint8_t *input, tran_low_t *output,
int stride, int hbd) {
dyadic_analyze_53_uint8_input(4, 8, 8, input, stride, output, 8, 2, hbd);
}
static int haar_ac_sad(const tran_low_t *output, int bw, int bh, int stride) {
int acsad = 0;
for (int r = 0; r < bh; ++r)
for (int c = 0; c < bw; ++c) {
if (r >= bh / 2 || c >= bw / 2) acsad += abs(output[r * stride + c]);
}
return acsad;
}
static int haar_ac_sad_8x8_uint8_input(const uint8_t *input, int stride,
int hbd) {
tran_low_t output[64];
av1_fdwt8x8_uint8_input_c(input, output, stride, hbd);
return haar_ac_sad(output, 8, 8, 8);
}
int64_t av1_haar_ac_sad_mxn_uint8_input(const uint8_t *input, int stride,
int hbd, int num_8x8_rows,
int num_8x8_cols) {
int64_t wavelet_energy = 0;
for (int r8 = 0; r8 < num_8x8_rows; ++r8) {
for (int c8 = 0; c8 < num_8x8_cols; ++c8) {
wavelet_energy += haar_ac_sad_8x8_uint8_input(
input + c8 * 8 + r8 * 8 * stride, stride, hbd);
}
}
return wavelet_energy;
}
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