2012-06-27 03:11:33 +02:00
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/*
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* Copyright (c) 2012 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include <math.h>
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#include <stdlib.h>
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#include <string.h>
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#include "third_party/googletest/src/include/gtest/gtest.h"
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extern "C" {
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#include "vp8/common/idct.h"
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#include "vp8/encoder/dct.h"
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}
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2012-06-29 01:26:31 +02:00
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#include "acm_random.h"
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2012-06-27 03:11:33 +02:00
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#include "vpx/vpx_integer.h"
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2012-06-29 01:26:31 +02:00
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using libvpx_test::ACMRandom;
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2012-06-27 03:11:33 +02:00
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2012-06-29 01:26:31 +02:00
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namespace {
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2012-06-27 03:11:33 +02:00
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TEST(Vp8FdctTest, SignBiasCheck) {
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ACMRandom rnd(ACMRandom::DeterministicSeed());
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int16_t test_input_block[16];
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int16_t test_output_block[16];
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const int pitch = 8;
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int count_sign_block[16][2];
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const int count_test_block = 1000000;
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memset(count_sign_block, 0, sizeof(count_sign_block));
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for (int i = 0; i < count_test_block; ++i) {
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// Initialize a test block with input range [-255, 255].
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for (int j = 0; j < 16; ++j)
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test_input_block[j] = rnd.Rand8() - rnd.Rand8();
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// TODO(Yaowu): this should be converted to a parameterized test
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// to test optimized versions of this function.
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vp8_short_fdct4x4_c(test_input_block, test_output_block, pitch);
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for (int j = 0; j < 16; ++j) {
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if (test_output_block[j] < 0)
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++count_sign_block[j][0];
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else if (test_output_block[j] > 0)
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++count_sign_block[j][1];
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}
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}
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for (int j = 0; j < 16; ++j) {
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const bool bias_acceptable = (abs(count_sign_block[j][0] -
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count_sign_block[j][1]) < 10000);
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EXPECT_TRUE(bias_acceptable)
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<< "Error: 4x4 FDCT has a sign bias > 1%"
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<< " for input range [-255, 255] at index " << j;
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}
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memset(count_sign_block, 0, sizeof(count_sign_block));
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for (int i = 0; i < count_test_block; ++i) {
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// Initialize a test block with input range [-15, 15].
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for (int j = 0; j < 16; ++j)
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test_input_block[j] = (rnd.Rand8() >> 4) - (rnd.Rand8() >> 4);
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// TODO(Yaowu): this should be converted to a parameterized test
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// to test optimized versions of this function.
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vp8_short_fdct4x4_c(test_input_block, test_output_block, pitch);
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for (int j = 0; j < 16; ++j) {
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if (test_output_block[j] < 0)
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++count_sign_block[j][0];
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else if (test_output_block[j] > 0)
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++count_sign_block[j][1];
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}
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}
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for (int j = 0; j < 16; ++j) {
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const bool bias_acceptable = (abs(count_sign_block[j][0] -
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count_sign_block[j][1]) < 100000);
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EXPECT_TRUE(bias_acceptable)
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<< "Error: 4x4 FDCT has a sign bias > 10%"
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<< " for input range [-15, 15] at index " << j;
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}
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};
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TEST(Vp8FdctTest, RoundTripErrorCheck) {
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ACMRandom rnd(ACMRandom::DeterministicSeed());
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int max_error = 0;
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double total_error = 0;
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const int count_test_block = 1000000;
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for (int i = 0; i < count_test_block; ++i) {
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int16_t test_input_block[16];
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int16_t test_temp_block[16];
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int16_t test_output_block[16];
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// Initialize a test block with input range [-255, 255].
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for (int j = 0; j < 16; ++j)
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test_input_block[j] = rnd.Rand8() - rnd.Rand8();
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// TODO(Yaowu): this should be converted to a parameterized test
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// to test optimized versions of this function.
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const int pitch = 8;
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vp8_short_fdct4x4_c(test_input_block, test_temp_block, pitch);
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// Because the bitstream is not frozen yet, use the idct in the codebase.
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vp8_short_idct4x4llm_c(test_temp_block, test_output_block, pitch);
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for (int j = 0; j < 16; ++j) {
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const int diff = test_input_block[j] - test_output_block[j];
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const int error = diff * diff;
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if (max_error < error)
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max_error = error;
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total_error += error;
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}
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}
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EXPECT_GE(1, max_error)
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<< "Error: FDCT/IDCT has an individual roundtrip error > 1";
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EXPECT_GE(count_test_block, total_error)
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<< "Error: FDCT/IDCT has average roundtrip error > 1 per block";
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};
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} // namespace
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