1 /* 2 * Copyright (c) 2012 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 12 #include <math.h> 13 #include <stddef.h> 14 #include <stdio.h> 15 #include <stdlib.h> 16 #include <string.h> 17 #include <sys/types.h> 18 19 20 extern "C" { 21 #include "./vp8_rtcd.h" 22 } 23 24 #include "test/acm_random.h" 25 #include "third_party/googletest/src/include/gtest/gtest.h" 26 #include "vpx/vpx_integer.h" 27 28 29 namespace { 30 31 const int cospi8sqrt2minus1 = 20091; 32 const int sinpi8sqrt2 = 35468; 33 34 void reference_idct4x4(const int16_t *input, int16_t *output) { 35 const int16_t *ip = input; 36 int16_t *op = output; 37 38 for (int i = 0; i < 4; ++i) { 39 const int a1 = ip[0] + ip[8]; 40 const int b1 = ip[0] - ip[8]; 41 const int temp1 = (ip[4] * sinpi8sqrt2) >> 16; 42 const int temp2 = ip[12] + ((ip[12] * cospi8sqrt2minus1) >> 16); 43 const int c1 = temp1 - temp2; 44 const int temp3 = ip[4] + ((ip[4] * cospi8sqrt2minus1) >> 16); 45 const int temp4 = (ip[12] * sinpi8sqrt2) >> 16; 46 const int d1 = temp3 + temp4; 47 op[0] = a1 + d1; 48 op[12] = a1 - d1; 49 op[4] = b1 + c1; 50 op[8] = b1 - c1; 51 ++ip; 52 ++op; 53 } 54 ip = output; 55 op = output; 56 for (int i = 0; i < 4; ++i) { 57 const int a1 = ip[0] + ip[2]; 58 const int b1 = ip[0] - ip[2]; 59 const int temp1 = (ip[1] * sinpi8sqrt2) >> 16; 60 const int temp2 = ip[3] + ((ip[3] * cospi8sqrt2minus1) >> 16); 61 const int c1 = temp1 - temp2; 62 const int temp3 = ip[1] + ((ip[1] * cospi8sqrt2minus1) >> 16); 63 const int temp4 = (ip[3] * sinpi8sqrt2) >> 16; 64 const int d1 = temp3 + temp4; 65 op[0] = (a1 + d1 + 4) >> 3; 66 op[3] = (a1 - d1 + 4) >> 3; 67 op[1] = (b1 + c1 + 4) >> 3; 68 op[2] = (b1 - c1 + 4) >> 3; 69 ip += 4; 70 op += 4; 71 } 72 } 73 74 using libvpx_test::ACMRandom; 75 76 TEST(Vp8FdctTest, SignBiasCheck) { 77 ACMRandom rnd(ACMRandom::DeterministicSeed()); 78 int16_t test_input_block[16]; 79 int16_t test_output_block[16]; 80 const int pitch = 8; 81 int count_sign_block[16][2]; 82 const int count_test_block = 1000000; 83 84 memset(count_sign_block, 0, sizeof(count_sign_block)); 85 86 for (int i = 0; i < count_test_block; ++i) { 87 // Initialize a test block with input range [-255, 255]. 88 for (int j = 0; j < 16; ++j) 89 test_input_block[j] = rnd.Rand8() - rnd.Rand8(); 90 91 vp8_short_fdct4x4_c(test_input_block, test_output_block, pitch); 92 93 for (int j = 0; j < 16; ++j) { 94 if (test_output_block[j] < 0) 95 ++count_sign_block[j][0]; 96 else if (test_output_block[j] > 0) 97 ++count_sign_block[j][1]; 98 } 99 } 100 101 bool bias_acceptable = true; 102 for (int j = 0; j < 16; ++j) 103 bias_acceptable = bias_acceptable && 104 (abs(count_sign_block[j][0] - count_sign_block[j][1]) < 10000); 105 106 EXPECT_EQ(true, bias_acceptable) 107 << "Error: 4x4 FDCT has a sign bias > 1% for input range [-255, 255]"; 108 109 memset(count_sign_block, 0, sizeof(count_sign_block)); 110 111 for (int i = 0; i < count_test_block; ++i) { 112 // Initialize a test block with input range [-15, 15]. 113 for (int j = 0; j < 16; ++j) 114 test_input_block[j] = (rnd.Rand8() >> 4) - (rnd.Rand8() >> 4); 115 116 vp8_short_fdct4x4_c(test_input_block, test_output_block, pitch); 117 118 for (int j = 0; j < 16; ++j) { 119 if (test_output_block[j] < 0) 120 ++count_sign_block[j][0]; 121 else if (test_output_block[j] > 0) 122 ++count_sign_block[j][1]; 123 } 124 } 125 126 bias_acceptable = true; 127 for (int j = 0; j < 16; ++j) 128 bias_acceptable = bias_acceptable && 129 (abs(count_sign_block[j][0] - count_sign_block[j][1]) < 100000); 130 131 EXPECT_EQ(true, bias_acceptable) 132 << "Error: 4x4 FDCT has a sign bias > 10% for input range [-15, 15]"; 133 }; 134 135 TEST(Vp8FdctTest, RoundTripErrorCheck) { 136 ACMRandom rnd(ACMRandom::DeterministicSeed()); 137 int max_error = 0; 138 double total_error = 0; 139 const int count_test_block = 1000000; 140 for (int i = 0; i < count_test_block; ++i) { 141 int16_t test_input_block[16]; 142 int16_t test_temp_block[16]; 143 int16_t test_output_block[16]; 144 145 // Initialize a test block with input range [-255, 255]. 146 for (int j = 0; j < 16; ++j) 147 test_input_block[j] = rnd.Rand8() - rnd.Rand8(); 148 149 const int pitch = 8; 150 vp8_short_fdct4x4_c(test_input_block, test_temp_block, pitch); 151 reference_idct4x4(test_temp_block, test_output_block); 152 153 for (int j = 0; j < 16; ++j) { 154 const int diff = test_input_block[j] - test_output_block[j]; 155 const int error = diff * diff; 156 if (max_error < error) 157 max_error = error; 158 total_error += error; 159 } 160 } 161 162 EXPECT_GE(1, max_error ) 163 << "Error: FDCT/IDCT has an individual roundtrip error > 1"; 164 165 EXPECT_GE(count_test_block, total_error) 166 << "Error: FDCT/IDCT has average roundtrip error > 1 per block"; 167 }; 168 169 } // namespace 170
