170 строки
4.9 KiB
C++
170 строки
4.9 KiB
C++
/*
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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 <stddef.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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extern "C" {
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#include "./vp8_rtcd.h"
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}
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#include "test/acm_random.h"
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#include "third_party/googletest/src/include/gtest/gtest.h"
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#include "vpx/vpx_integer.h"
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namespace {
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const int cospi8sqrt2minus1 = 20091;
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const int sinpi8sqrt2 = 35468;
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void reference_idct4x4(const int16_t *input, int16_t *output) {
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const int16_t *ip = input;
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int16_t *op = output;
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for (int i = 0; i < 4; ++i) {
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const int a1 = ip[0] + ip[8];
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const int b1 = ip[0] - ip[8];
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const int temp1 = (ip[4] * sinpi8sqrt2) >> 16;
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const int temp2 = ip[12] + ((ip[12] * cospi8sqrt2minus1) >> 16);
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const int c1 = temp1 - temp2;
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const int temp3 = ip[4] + ((ip[4] * cospi8sqrt2minus1) >> 16);
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const int temp4 = (ip[12] * sinpi8sqrt2) >> 16;
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const int d1 = temp3 + temp4;
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op[0] = a1 + d1;
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op[12] = a1 - d1;
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op[4] = b1 + c1;
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op[8] = b1 - c1;
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++ip;
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++op;
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}
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ip = output;
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op = output;
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for (int i = 0; i < 4; ++i) {
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const int a1 = ip[0] + ip[2];
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const int b1 = ip[0] - ip[2];
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const int temp1 = (ip[1] * sinpi8sqrt2) >> 16;
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const int temp2 = ip[3] + ((ip[3] * cospi8sqrt2minus1) >> 16);
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const int c1 = temp1 - temp2;
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const int temp3 = ip[1] + ((ip[1] * cospi8sqrt2minus1) >> 16);
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const int temp4 = (ip[3] * sinpi8sqrt2) >> 16;
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const int d1 = temp3 + temp4;
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op[0] = (a1 + d1 + 4) >> 3;
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op[3] = (a1 - d1 + 4) >> 3;
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op[1] = (b1 + c1 + 4) >> 3;
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op[2] = (b1 - c1 + 4) >> 3;
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ip += 4;
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op += 4;
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}
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}
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using libvpx_test::ACMRandom;
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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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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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bool bias_acceptable = true;
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for (int j = 0; j < 16; ++j)
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bias_acceptable = bias_acceptable &&
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(abs(count_sign_block[j][0] - count_sign_block[j][1]) < 10000);
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EXPECT_EQ(true, bias_acceptable)
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<< "Error: 4x4 FDCT has a sign bias > 1% for input range [-255, 255]";
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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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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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bias_acceptable = true;
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for (int j = 0; j < 16; ++j)
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bias_acceptable = bias_acceptable &&
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(abs(count_sign_block[j][0] - count_sign_block[j][1]) < 100000);
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EXPECT_EQ(true, bias_acceptable)
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<< "Error: 4x4 FDCT has a sign bias > 10% for input range [-15, 15]";
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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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const int pitch = 8;
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vp8_short_fdct4x4_c(test_input_block, test_temp_block, pitch);
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reference_idct4x4(test_temp_block, test_output_block);
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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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