shithub: openh264

ref: 3f982a4de485f7ddbde702782f9c6d7de247d59e
dir: /test/encoder/EncUT_ExpGolomb.cpp/

#include <gtest/gtest.h>
#include <math.h>
#include "svc_enc_golomb.h"
#include "macros.h"

using namespace WelsSVCEnc;

const double g_kdLog2Factor = 1.0 / log(2.0);

TEST(UeExpGolombTest, TestBsSizeUeLt256) {
  uint32_t uiInVal = 0;
  for (; uiInVal < 256; ++ uiInVal) {
    const uint32_t uiActVal = BsSizeUE( uiInVal );
    const int32_t m = static_cast<int32_t>(log( (uiInVal+1) * 1.0 ) * g_kdLog2Factor + 1e-6);
    const uint32_t uiExpVal = (m<<1)+1;
    EXPECT_EQ(uiActVal, uiExpVal);
  }
}

TEST(UeExpGolombTest, TestBsSizeUeRangeFrom256To65534) {
  uint32_t uiInVal = 0x100;
  for (; uiInVal < 0xFFFF; ++ uiInVal) {
    const uint32_t uiActVal = BsSizeUE( uiInVal );
    const int32_t m = static_cast<int32_t>(log( (uiInVal+1) * 1.0 ) * g_kdLog2Factor + 1e-6);
    const uint32_t uiExpVal = (m<<1)+1;
    EXPECT_EQ(uiActVal, uiExpVal);
  }
}

TEST(UeExpGolombTest, TestBsSizeUeRangeFrom65535ToPlus256) {
  uint32_t uiInVal = 0xFFFF;
  const uint32_t uiCountBase = 256;
  const uint32_t uiInValEnd = uiInVal + uiCountBase;
  for (; uiInVal < uiInValEnd; ++ uiInVal) {
    const uint32_t uiActVal = BsSizeUE( uiInVal );
    // float precision issue in case use math::log
    const int32_t m = WELS_LOG2(1+uiInVal);
    const uint32_t uiExpVal = (m<<1)+1;
    EXPECT_EQ(uiActVal, uiExpVal);
  }
}