1 /* 2 * Copyright (c) 2013 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 #include <math.h> 12 #include <stddef.h> 13 #include <stdio.h> 14 #include <stdlib.h> 15 #include <string.h> 16 #include <sys/types.h> 17 18 #include "./vp8_rtcd.h" 19 20 #include "test/acm_random.h" 21 #include "third_party/googletest/src/include/gtest/gtest.h" 22 #include "vpx/vpx_integer.h" 23 24 namespace { 25 26 const int cospi8sqrt2minus1 = 20091; 27 const int sinpi8sqrt2 = 35468; 28 29 void reference_idct4x4(const int16_t *input, int16_t *output) { 30 const int16_t *ip = input; 31 int16_t *op = output; 32 33 for (int i = 0; i < 4; ++i) { 34 const int a1 = ip[0] + ip[8]; 35 const int b1 = ip[0] - ip[8]; 36 const int temp1 = (ip[4] * sinpi8sqrt2) >> 16; 37 const int temp2 = ip[12] + ((ip[12] * cospi8sqrt2minus1) >> 16); 38 const int c1 = temp1 - temp2; 39 const int temp3 = ip[4] + ((ip[4] * cospi8sqrt2minus1) >> 16); 40 const int temp4 = (ip[12] * sinpi8sqrt2) >> 16; 41 const int d1 = temp3 + temp4; 42 op[0] = a1 + d1; 43 op[12] = a1 - d1; 44 op[4] = b1 + c1; 45 op[8] = b1 - c1; 46 ++ip; 47 ++op; 48 } 49 ip = output; 50 op = output; 51 for (int i = 0; i < 4; ++i) { 52 const int a1 = ip[0] + ip[2]; 53 const int b1 = ip[0] - ip[2]; 54 const int temp1 = (ip[1] * sinpi8sqrt2) >> 16; 55 const int temp2 = ip[3] + ((ip[3] * cospi8sqrt2minus1) >> 16); 56 const int c1 = temp1 - temp2; 57 const int temp3 = ip[1] + ((ip[1] * cospi8sqrt2minus1) >> 16); 58 const int temp4 = (ip[3] * sinpi8sqrt2) >> 16; 59 const int d1 = temp3 + temp4; 60 op[0] = (a1 + d1 + 4) >> 3; 61 op[3] = (a1 - d1 + 4) >> 3; 62 op[1] = (b1 + c1 + 4) >> 3; 63 op[2] = (b1 - c1 + 4) >> 3; 64 ip += 4; 65 op += 4; 66 } 67 } 68 69 using libvpx_test::ACMRandom; 70 71 TEST(VP8FdctTest, SignBiasCheck) { 72 ACMRandom rnd(ACMRandom::DeterministicSeed()); 73 int16_t test_input_block[16]; 74 int16_t test_output_block[16]; 75 const int pitch = 8; 76 int count_sign_block[16][2]; 77 const int count_test_block = 1000000; 78 79 memset(count_sign_block, 0, sizeof(count_sign_block)); 80 81 for (int i = 0; i < count_test_block; ++i) { 82 // Initialize a test block with input range [-255, 255]. 83 for (int j = 0; j < 16; ++j) 84 test_input_block[j] = rnd.Rand8() - rnd.Rand8(); 85 86 vp8_short_fdct4x4_c(test_input_block, test_output_block, pitch); 87 88 for (int j = 0; j < 16; ++j) { 89 if (test_output_block[j] < 0) 90 ++count_sign_block[j][0]; 91 else if (test_output_block[j] > 0) 92 ++count_sign_block[j][1]; 93 } 94 } 95 96 bool bias_acceptable = true; 97 for (int j = 0; j < 16; ++j) 98 bias_acceptable = bias_acceptable && 99 (abs(count_sign_block[j][0] - count_sign_block[j][1]) < 10000); 100 101 EXPECT_EQ(true, bias_acceptable) 102 << "Error: 4x4 FDCT has a sign bias > 1% for input range [-255, 255]"; 103 104 memset(count_sign_block, 0, sizeof(count_sign_block)); 105 106 for (int i = 0; i < count_test_block; ++i) { 107 // Initialize a test block with input range [-15, 15]. 108 for (int j = 0; j < 16; ++j) 109 test_input_block[j] = (rnd.Rand8() >> 4) - (rnd.Rand8() >> 4); 110 111 vp8_short_fdct4x4_c(test_input_block, test_output_block, pitch); 112 113 for (int j = 0; j < 16; ++j) { 114 if (test_output_block[j] < 0) 115 ++count_sign_block[j][0]; 116 else if (test_output_block[j] > 0) 117 ++count_sign_block[j][1]; 118 } 119 } 120 121 bias_acceptable = true; 122 for (int j = 0; j < 16; ++j) 123 bias_acceptable = bias_acceptable && 124 (abs(count_sign_block[j][0] - count_sign_block[j][1]) < 100000); 125 126 EXPECT_EQ(true, bias_acceptable) 127 << "Error: 4x4 FDCT has a sign bias > 10% for input range [-15, 15]"; 128 }; 129 130 TEST(VP8FdctTest, RoundTripErrorCheck) { 131 ACMRandom rnd(ACMRandom::DeterministicSeed()); 132 int max_error = 0; 133 double total_error = 0; 134 const int count_test_block = 1000000; 135 for (int i = 0; i < count_test_block; ++i) { 136 int16_t test_input_block[16]; 137 int16_t test_temp_block[16]; 138 int16_t test_output_block[16]; 139 140 // Initialize a test block with input range [-255, 255]. 141 for (int j = 0; j < 16; ++j) 142 test_input_block[j] = rnd.Rand8() - rnd.Rand8(); 143 144 const int pitch = 8; 145 vp8_short_fdct4x4_c(test_input_block, test_temp_block, pitch); 146 reference_idct4x4(test_temp_block, test_output_block); 147 148 for (int j = 0; j < 16; ++j) { 149 const int diff = test_input_block[j] - test_output_block[j]; 150 const int error = diff * diff; 151 if (max_error < error) 152 max_error = error; 153 total_error += error; 154 } 155 } 156 157 EXPECT_GE(1, max_error ) 158 << "Error: FDCT/IDCT has an individual roundtrip error > 1"; 159 160 EXPECT_GE(count_test_block, total_error) 161 << "Error: FDCT/IDCT has average roundtrip error > 1 per block"; 162 }; 163 164 } // namespace 165
