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+/*
+ * Copyright (c) 2016, 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 "./av1_rtcd.h"
+#include "./aom_config.h"
+#include "./aom_dsp_rtcd.h"
+#include "av1/common/common.h"
+#include "av1/common/filter.h"
+#include "aom/aom_integer.h"
+#include "aom_dsp/aom_convolve.h"
+#include "aom_dsp/aom_filter.h"
+#include "aom_ports/mem.h"
+#include "aom_ports/system_state.h"
+
+static int horizontal_filter(const uint8_t *s) {
+ return (s[1] - s[-2]) * 2 + (s[-1] - s[0]) * 6;
+}
+
+static int vertical_filter(const uint8_t *s, int p) {
+ return (s[p] - s[-2 * p]) * 2 + (s[-p] - s[0]) * 6;
+}
+
+static int variance(int sum, int sum_squared, int size) {
+ return sum_squared / size - (sum / size) * (sum / size);
+}
+// Calculate a blockiness level for a vertical block edge.
+// This function returns a new blockiness metric that's defined as
+
+// p0 p1 p2 p3
+// q0 q1 q2 q3
+// block edge ->
+// r0 r1 r2 r3
+// s0 s1 s2 s3
+
+// blockiness = p0*-2+q0*6+r0*-6+s0*2 +
+// p1*-2+q1*6+r1*-6+s1*2 +
+// p2*-2+q2*6+r2*-6+s2*2 +
+// p3*-2+q3*6+r3*-6+s3*2 ;
+
+// reconstructed_blockiness = abs(blockiness from reconstructed buffer -
+// blockiness from source buffer,0)
+//
+// I make the assumption that flat blocks are much more visible than high
+// contrast blocks. As such, I scale the result of the blockiness calc
+// by dividing the blockiness by the variance of the pixels on either side
+// of the edge as follows:
+// var_0 = (q0^2+q1^2+q2^2+q3^2) - ((q0 + q1 + q2 + q3) / 4 )^2
+// var_1 = (r0^2+r1^2+r2^2+r3^2) - ((r0 + r1 + r2 + r3) / 4 )^2
+// The returned blockiness is the scaled value
+// Reconstructed blockiness / ( 1 + var_0 + var_1 ) ;
+static int blockiness_vertical(const uint8_t *s, int sp, const uint8_t *r,
+ int rp, int size) {
+ int s_blockiness = 0;
+ int r_blockiness = 0;
+ int sum_0 = 0;
+ int sum_sq_0 = 0;
+ int sum_1 = 0;
+ int sum_sq_1 = 0;
+ int i;
+ int var_0;
+ int var_1;
+ for (i = 0; i < size; ++i, s += sp, r += rp) {
+ s_blockiness += horizontal_filter(s);
+ r_blockiness += horizontal_filter(r);
+ sum_0 += s[0];
+ sum_sq_0 += s[0] * s[0];
+ sum_1 += s[-1];
+ sum_sq_1 += s[-1] * s[-1];
+ }
+ var_0 = variance(sum_0, sum_sq_0, size);
+ var_1 = variance(sum_1, sum_sq_1, size);
+ r_blockiness = abs(r_blockiness);
+ s_blockiness = abs(s_blockiness);
+
+ if (r_blockiness > s_blockiness)
+ return (r_blockiness - s_blockiness) / (1 + var_0 + var_1);
+ else
+ return 0;
+}
+
+// Calculate a blockiness level for a horizontal block edge
+// same as above.
+static int blockiness_horizontal(const uint8_t *s, int sp, const uint8_t *r,
+ int rp, int size) {
+ int s_blockiness = 0;
+ int r_blockiness = 0;
+ int sum_0 = 0;
+ int sum_sq_0 = 0;
+ int sum_1 = 0;
+ int sum_sq_1 = 0;
+ int i;
+ int var_0;
+ int var_1;
+ for (i = 0; i < size; ++i, ++s, ++r) {
+ s_blockiness += vertical_filter(s, sp);
+ r_blockiness += vertical_filter(r, rp);
+ sum_0 += s[0];
+ sum_sq_0 += s[0] * s[0];
+ sum_1 += s[-sp];
+ sum_sq_1 += s[-sp] * s[-sp];
+ }
+ var_0 = variance(sum_0, sum_sq_0, size);
+ var_1 = variance(sum_1, sum_sq_1, size);
+ r_blockiness = abs(r_blockiness);
+ s_blockiness = abs(s_blockiness);
+
+ if (r_blockiness > s_blockiness)
+ return (r_blockiness - s_blockiness) / (1 + var_0 + var_1);
+ else
+ return 0;
+}
+
+// This function returns the blockiness for the entire frame currently by
+// looking at all borders in steps of 4.
+double av1_get_blockiness(const unsigned char *img1, int img1_pitch,
+ const unsigned char *img2, int img2_pitch, int width,
+ int height) {
+ double blockiness = 0;
+ int i, j;
+ aom_clear_system_state();
+ for (i = 0; i < height;
+ i += 4, img1 += img1_pitch * 4, img2 += img2_pitch * 4) {
+ for (j = 0; j < width; j += 4) {
+ if (i > 0 && i < height && j > 0 && j < width) {
+ blockiness +=
+ blockiness_vertical(img1 + j, img1_pitch, img2 + j, img2_pitch, 4);
+ blockiness += blockiness_horizontal(img1 + j, img1_pitch, img2 + j,
+ img2_pitch, 4);
+ }
+ }
+ }
+ blockiness /= width * height / 16;
+ return blockiness;
+}