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/*
* Copyright (c) 2012 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.
*/
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include "third_party/googletest/src/include/gtest/gtest.h"
extern "C" {
#include "vp8/common/idct.h"
#include "vp8/encoder/dct.h"
}
#include "acm_random.h"
#include "vpx/vpx_integer.h"
using libvpx_test::ACMRandom;
namespace {
TEST(Vp8FdctTest, SignBiasCheck) {
ACMRandom rnd(ACMRandom::DeterministicSeed());
int16_t test_input_block[16];
int16_t test_output_block[16];
const int pitch = 8;
int count_sign_block[16][2];
const int count_test_block = 1000000;
memset(count_sign_block, 0, sizeof(count_sign_block));
for (int i = 0; i < count_test_block; ++i) {
// Initialize a test block with input range [-255, 255].
for (int j = 0; j < 16; ++j)
test_input_block[j] = rnd.Rand8() - rnd.Rand8();
// TODO(Yaowu): this should be converted to a parameterized test
// to test optimized versions of this function.
vp8_short_fdct4x4_c(test_input_block, test_output_block, pitch);
for (int j = 0; j < 16; ++j) {
if (test_output_block[j] < 0)
++count_sign_block[j][0];
else if (test_output_block[j] > 0)
++count_sign_block[j][1];
}
}
for (int j = 0; j < 16; ++j) {
const bool bias_acceptable = (abs(count_sign_block[j][0] -
count_sign_block[j][1]) < 10000);
EXPECT_TRUE(bias_acceptable)
<< "Error: 4x4 FDCT has a sign bias > 1%"
<< " for input range [-255, 255] at index " << j;
}
memset(count_sign_block, 0, sizeof(count_sign_block));
for (int i = 0; i < count_test_block; ++i) {
// Initialize a test block with input range [-15, 15].
for (int j = 0; j < 16; ++j)
test_input_block[j] = (rnd.Rand8() >> 4) - (rnd.Rand8() >> 4);
// TODO(Yaowu): this should be converted to a parameterized test
// to test optimized versions of this function.
vp8_short_fdct4x4_c(test_input_block, test_output_block, pitch);
for (int j = 0; j < 16; ++j) {
if (test_output_block[j] < 0)
++count_sign_block[j][0];
else if (test_output_block[j] > 0)
++count_sign_block[j][1];
}
}
for (int j = 0; j < 16; ++j) {
const bool bias_acceptable = (abs(count_sign_block[j][0] -
count_sign_block[j][1]) < 100000);
EXPECT_TRUE(bias_acceptable)
<< "Error: 4x4 FDCT has a sign bias > 10%"
<< " for input range [-15, 15] at index " << j;
}
};
TEST(Vp8FdctTest, RoundTripErrorCheck) {
ACMRandom rnd(ACMRandom::DeterministicSeed());
int max_error = 0;
double total_error = 0;
const int count_test_block = 1000000;
for (int i = 0; i < count_test_block; ++i) {
int16_t test_input_block[16];
int16_t test_temp_block[16];
int16_t test_output_block[16];
// Initialize a test block with input range [-255, 255].
for (int j = 0; j < 16; ++j)
test_input_block[j] = rnd.Rand8() - rnd.Rand8();
// TODO(Yaowu): this should be converted to a parameterized test
// to test optimized versions of this function.
const int pitch = 8;
vp8_short_fdct4x4_c(test_input_block, test_temp_block, pitch);
for (int j = 0; j < 16; ++j) {
if(test_temp_block[j] > 0) {
test_temp_block[j] += 2;
test_temp_block[j] /= 4;
test_temp_block[j] *= 4;
} else {
test_temp_block[j] -= 2;
test_temp_block[j] /= 4;
test_temp_block[j] *= 4;
}
}
// Because the bitstream is not frozen yet, use the idct in the codebase.
vp8_short_idct4x4llm_c(test_temp_block, test_output_block, pitch);
for (int j = 0; j < 16; ++j) {
const int diff = test_input_block[j] - test_output_block[j];
const int error = diff * diff;
if (max_error < error)
max_error = error;
total_error += error;
}
}
EXPECT_GE(1, max_error)
<< "Error: FDCT/IDCT has an individual roundtrip error > 1";
EXPECT_GE(count_test_block, total_error)
<< "Error: FDCT/IDCT has average roundtrip error > 1 per block";
};
} // namespace
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