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 #include <math.h> 12 #include <stdlib.h> 13 #include <string.h> 14 15 #include "third_party/googletest/src/include/gtest/gtest.h" 16 17 #include "./vpx_dsp_rtcd.h" 18 #include "test/acm_random.h" 19 #include "vpx/vpx_integer.h" 20 #include "vpx_ports/msvc.h" // for round() 21 22 using libvpx_test::ACMRandom; 23 24 namespace { 25 26 void reference_dct_1d(double input[8], double output[8]) { 27 const double kPi = 3.141592653589793238462643383279502884; 28 const double kInvSqrt2 = 0.707106781186547524400844362104; 29 for (int k = 0; k < 8; k++) { 30 output[k] = 0.0; 31 for (int n = 0; n < 8; n++) { 32 output[k] += input[n] * cos(kPi * (2 * n + 1) * k / 16.0); 33 } 34 if (k == 0) output[k] = output[k] * kInvSqrt2; 35 } 36 } 37 38 void reference_dct_2d(int16_t input[64], double output[64]) { 39 // First transform columns 40 for (int i = 0; i < 8; ++i) { 41 double temp_in[8], temp_out[8]; 42 for (int j = 0; j < 8; ++j) temp_in[j] = input[j * 8 + i]; 43 reference_dct_1d(temp_in, temp_out); 44 for (int j = 0; j < 8; ++j) output[j * 8 + i] = temp_out[j]; 45 } 46 // Then transform rows 47 for (int i = 0; i < 8; ++i) { 48 double temp_in[8], temp_out[8]; 49 for (int j = 0; j < 8; ++j) temp_in[j] = output[j + i * 8]; 50 reference_dct_1d(temp_in, temp_out); 51 for (int j = 0; j < 8; ++j) output[j + i * 8] = temp_out[j]; 52 } 53 // Scale by some magic number 54 for (int i = 0; i < 64; ++i) output[i] *= 2; 55 } 56 57 TEST(VP9Idct8x8Test, AccuracyCheck) { 58 ACMRandom rnd(ACMRandom::DeterministicSeed()); 59 const int count_test_block = 10000; 60 for (int i = 0; i < count_test_block; ++i) { 61 int16_t input[64]; 62 tran_low_t coeff[64]; 63 double output_r[64]; 64 uint8_t dst[64], src[64]; 65 66 for (int j = 0; j < 64; ++j) { 67 src[j] = rnd.Rand8(); 68 dst[j] = rnd.Rand8(); 69 } 70 // Initialize a test block with input range [-255, 255]. 71 for (int j = 0; j < 64; ++j) input[j] = src[j] - dst[j]; 72 73 reference_dct_2d(input, output_r); 74 for (int j = 0; j < 64; ++j) { 75 coeff[j] = static_cast<tran_low_t>(round(output_r[j])); 76 } 77 vpx_idct8x8_64_add_c(coeff, dst, 8); 78 for (int j = 0; j < 64; ++j) { 79 const int diff = dst[j] - src[j]; 80 const int error = diff * diff; 81 EXPECT_GE(1, error) << "Error: 8x8 FDCT/IDCT has error " << error 82 << " at index " << j; 83 } 84 } 85 } 86 87 } // namespace 88
