ref: 8a7847c2c95cf7e0366eded4dddfcc8c066f4447
dir: /test/idct8x8_test.cc/
/* * Copyright (c) 2012 The WebM project authors. All Rights Reserved. * * Use of this source code is governed by a BSD-style license * that can be found in the LICENSE file in the root of the source * tree. An additional intellectual property rights grant can be found * in the file PATENTS. All contributing project authors may * be found in the AUTHORS file in the root of the source tree. */ #include <math.h> #include <stdlib.h> #include <string.h> #include "third_party/googletest/src/include/gtest/gtest.h" #include "./vpx_dsp_rtcd.h" #include "test/acm_random.h" #include "vpx/vpx_integer.h" #include "vpx_ports/msvc.h" // for round() using libvpx_test::ACMRandom; namespace { void reference_dct_1d(double input[8], double output[8]) { const double kPi = 3.141592653589793238462643383279502884; const double kInvSqrt2 = 0.707106781186547524400844362104; for (int k = 0; k < 8; k++) { output[k] = 0.0; for (int n = 0; n < 8; n++) { output[k] += input[n] * cos(kPi * (2 * n + 1) * k / 16.0); } if (k == 0) output[k] = output[k] * kInvSqrt2; } } void reference_dct_2d(int16_t input[64], double output[64]) { // First transform columns for (int i = 0; i < 8; ++i) { double temp_in[8], temp_out[8]; for (int j = 0; j < 8; ++j) temp_in[j] = input[j * 8 + i]; reference_dct_1d(temp_in, temp_out); for (int j = 0; j < 8; ++j) output[j * 8 + i] = temp_out[j]; } // Then transform rows for (int i = 0; i < 8; ++i) { double temp_in[8], temp_out[8]; for (int j = 0; j < 8; ++j) temp_in[j] = output[j + i * 8]; reference_dct_1d(temp_in, temp_out); for (int j = 0; j < 8; ++j) output[j + i * 8] = temp_out[j]; } // Scale by some magic number for (int i = 0; i < 64; ++i) output[i] *= 2; } TEST(VP9Idct8x8Test, AccuracyCheck) { ACMRandom rnd(ACMRandom::DeterministicSeed()); const int count_test_block = 10000; for (int i = 0; i < count_test_block; ++i) { int16_t input[64]; tran_low_t coeff[64]; double output_r[64]; uint8_t dst[64], src[64]; for (int j = 0; j < 64; ++j) { src[j] = rnd.Rand8(); dst[j] = rnd.Rand8(); } // Initialize a test block with input range [-255, 255]. for (int j = 0; j < 64; ++j) input[j] = src[j] - dst[j]; reference_dct_2d(input, output_r); for (int j = 0; j < 64; ++j) { coeff[j] = static_cast<tran_low_t>(round(output_r[j])); } vpx_idct8x8_64_add_c(coeff, dst, 8); for (int j = 0; j < 64; ++j) { const int diff = dst[j] - src[j]; const int error = diff * diff; EXPECT_GE(1, error) << "Error: 8x8 FDCT/IDCT has error " << error << " at index " << j; } } } } // namespace