ref: 47cf7c25a283db3f730779439f243933d46a0735
dir: /test/fdct4x4_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 "./vp9_rtcd.h"
#include "./vpx_dsp_rtcd.h"
#include "test/acm_random.h"
#include "test/clear_system_state.h"
#include "test/register_state_check.h"
#include "test/util.h"
#include "vp9/common/vp9_entropy.h"
#include "vpx/vpx_codec.h"
#include "vpx/vpx_integer.h"
#include "vpx_ports/mem.h"
using libvpx_test::ACMRandom;
namespace {
const int kNumCoeffs = 16;
typedef void (*FdctFunc)(const int16_t *in, tran_low_t *out, int stride);
typedef void (*IdctFunc)(const tran_low_t *in, uint8_t *out, int stride);
typedef void (*FhtFunc)(const int16_t *in, tran_low_t *out, int stride,
int tx_type);
typedef void (*IhtFunc)(const tran_low_t *in, uint8_t *out, int stride,
int tx_type);
typedef std::tr1::tuple<FdctFunc, IdctFunc, int, vpx_bit_depth_t> Dct4x4Param;
typedef std::tr1::tuple<FhtFunc, IhtFunc, int, vpx_bit_depth_t> Ht4x4Param;
void fdct4x4_ref(const int16_t *in, tran_low_t *out, int stride,
int /*tx_type*/) {
vpx_fdct4x4_c(in, out, stride);
}
void fht4x4_ref(const int16_t *in, tran_low_t *out, int stride, int tx_type) {
vp9_fht4x4_c(in, out, stride, tx_type);
}
void fwht4x4_ref(const int16_t *in, tran_low_t *out, int stride,
int /*tx_type*/) {
vp9_fwht4x4_c(in, out, stride);
}
#if CONFIG_VP9_HIGHBITDEPTH
void idct4x4_10(const tran_low_t *in, uint8_t *out, int stride) {
vpx_highbd_idct4x4_16_add_c(in, out, stride, 10);
}
void idct4x4_12(const tran_low_t *in, uint8_t *out, int stride) {
vpx_highbd_idct4x4_16_add_c(in, out, stride, 12);
}
void iht4x4_10(const tran_low_t *in, uint8_t *out, int stride, int tx_type) {
vp9_highbd_iht4x4_16_add_c(in, out, stride, tx_type, 10);
}
void iht4x4_12(const tran_low_t *in, uint8_t *out, int stride, int tx_type) {
vp9_highbd_iht4x4_16_add_c(in, out, stride, tx_type, 12);
}
void iwht4x4_10(const tran_low_t *in, uint8_t *out, int stride) {
vpx_highbd_iwht4x4_16_add_c(in, out, stride, 10);
}
void iwht4x4_12(const tran_low_t *in, uint8_t *out, int stride) {
vpx_highbd_iwht4x4_16_add_c(in, out, stride, 12);
}
#if HAVE_SSE2
void idct4x4_10_sse2(const tran_low_t *in, uint8_t *out, int stride) {
vpx_highbd_idct4x4_16_add_sse2(in, out, stride, 10);
}
void idct4x4_12_sse2(const tran_low_t *in, uint8_t *out, int stride) {
vpx_highbd_idct4x4_16_add_sse2(in, out, stride, 12);
}
#endif // HAVE_SSE2
#endif // CONFIG_VP9_HIGHBITDEPTH
class Trans4x4TestBase {
public:
virtual ~Trans4x4TestBase() {}
protected:
virtual void RunFwdTxfm(const int16_t *in, tran_low_t *out, int stride) = 0;
virtual void RunInvTxfm(const tran_low_t *out, uint8_t *dst, int stride) = 0;
void RunAccuracyCheck(int limit) {
ACMRandom rnd(ACMRandom::DeterministicSeed());
uint32_t max_error = 0;
int64_t total_error = 0;
const int count_test_block = 10000;
for (int i = 0; i < count_test_block; ++i) {
DECLARE_ALIGNED(16, int16_t, test_input_block[kNumCoeffs]);
DECLARE_ALIGNED(16, tran_low_t, test_temp_block[kNumCoeffs]);
DECLARE_ALIGNED(16, uint8_t, dst[kNumCoeffs]);
DECLARE_ALIGNED(16, uint8_t, src[kNumCoeffs]);
#if CONFIG_VP9_HIGHBITDEPTH
DECLARE_ALIGNED(16, uint16_t, dst16[kNumCoeffs]);
DECLARE_ALIGNED(16, uint16_t, src16[kNumCoeffs]);
#endif
// Initialize a test block with input range [-255, 255].
for (int j = 0; j < kNumCoeffs; ++j) {
if (bit_depth_ == VPX_BITS_8) {
src[j] = rnd.Rand8();
dst[j] = rnd.Rand8();
test_input_block[j] = src[j] - dst[j];
#if CONFIG_VP9_HIGHBITDEPTH
} else {
src16[j] = rnd.Rand16() & mask_;
dst16[j] = rnd.Rand16() & mask_;
test_input_block[j] = src16[j] - dst16[j];
#endif
}
}
ASM_REGISTER_STATE_CHECK(
RunFwdTxfm(test_input_block, test_temp_block, pitch_));
if (bit_depth_ == VPX_BITS_8) {
ASM_REGISTER_STATE_CHECK(RunInvTxfm(test_temp_block, dst, pitch_));
#if CONFIG_VP9_HIGHBITDEPTH
} else {
ASM_REGISTER_STATE_CHECK(
RunInvTxfm(test_temp_block, CONVERT_TO_BYTEPTR(dst16), pitch_));
#endif
}
for (int j = 0; j < kNumCoeffs; ++j) {
#if CONFIG_VP9_HIGHBITDEPTH
const int diff =
bit_depth_ == VPX_BITS_8 ? dst[j] - src[j] : dst16[j] - src16[j];
#else
ASSERT_EQ(VPX_BITS_8, bit_depth_);
const int diff = dst[j] - src[j];
#endif
const uint32_t error = diff * diff;
if (max_error < error) max_error = error;
total_error += error;
}
}
EXPECT_GE(static_cast<uint32_t>(limit), max_error)
<< "Error: 4x4 FHT/IHT has an individual round trip error > " << limit;
EXPECT_GE(count_test_block * limit, total_error)
<< "Error: 4x4 FHT/IHT has average round trip error > " << limit
<< " per block";
}
void RunCoeffCheck() {
ACMRandom rnd(ACMRandom::DeterministicSeed());
const int count_test_block = 5000;
DECLARE_ALIGNED(16, int16_t, input_block[kNumCoeffs]);
DECLARE_ALIGNED(16, tran_low_t, output_ref_block[kNumCoeffs]);
DECLARE_ALIGNED(16, tran_low_t, output_block[kNumCoeffs]);
for (int i = 0; i < count_test_block; ++i) {
// Initialize a test block with input range [-mask_, mask_].
for (int j = 0; j < kNumCoeffs; ++j) {
input_block[j] = (rnd.Rand16() & mask_) - (rnd.Rand16() & mask_);
}
fwd_txfm_ref(input_block, output_ref_block, pitch_, tx_type_);
ASM_REGISTER_STATE_CHECK(RunFwdTxfm(input_block, output_block, pitch_));
// The minimum quant value is 4.
for (int j = 0; j < kNumCoeffs; ++j)
EXPECT_EQ(output_block[j], output_ref_block[j]);
}
}
void RunMemCheck() {
ACMRandom rnd(ACMRandom::DeterministicSeed());
const int count_test_block = 5000;
DECLARE_ALIGNED(16, int16_t, input_extreme_block[kNumCoeffs]);
DECLARE_ALIGNED(16, tran_low_t, output_ref_block[kNumCoeffs]);
DECLARE_ALIGNED(16, tran_low_t, output_block[kNumCoeffs]);
for (int i = 0; i < count_test_block; ++i) {
// Initialize a test block with input range [-mask_, mask_].
for (int j = 0; j < kNumCoeffs; ++j) {
input_extreme_block[j] = rnd.Rand8() % 2 ? mask_ : -mask_;
}
if (i == 0) {
for (int j = 0; j < kNumCoeffs; ++j) input_extreme_block[j] = mask_;
} else if (i == 1) {
for (int j = 0; j < kNumCoeffs; ++j) input_extreme_block[j] = -mask_;
}
fwd_txfm_ref(input_extreme_block, output_ref_block, pitch_, tx_type_);
ASM_REGISTER_STATE_CHECK(
RunFwdTxfm(input_extreme_block, output_block, pitch_));
// The minimum quant value is 4.
for (int j = 0; j < kNumCoeffs; ++j) {
EXPECT_EQ(output_block[j], output_ref_block[j]);
EXPECT_GE(4 * DCT_MAX_VALUE << (bit_depth_ - 8), abs(output_block[j]))
<< "Error: 4x4 FDCT has coefficient larger than 4*DCT_MAX_VALUE";
}
}
}
void RunInvAccuracyCheck(int limit) {
ACMRandom rnd(ACMRandom::DeterministicSeed());
const int count_test_block = 1000;
DECLARE_ALIGNED(16, int16_t, in[kNumCoeffs]);
DECLARE_ALIGNED(16, tran_low_t, coeff[kNumCoeffs]);
DECLARE_ALIGNED(16, uint8_t, dst[kNumCoeffs]);
DECLARE_ALIGNED(16, uint8_t, src[kNumCoeffs]);
#if CONFIG_VP9_HIGHBITDEPTH
DECLARE_ALIGNED(16, uint16_t, dst16[kNumCoeffs]);
DECLARE_ALIGNED(16, uint16_t, src16[kNumCoeffs]);
#endif
for (int i = 0; i < count_test_block; ++i) {
// Initialize a test block with input range [-mask_, mask_].
for (int j = 0; j < kNumCoeffs; ++j) {
if (bit_depth_ == VPX_BITS_8) {
src[j] = rnd.Rand8();
dst[j] = rnd.Rand8();
in[j] = src[j] - dst[j];
#if CONFIG_VP9_HIGHBITDEPTH
} else {
src16[j] = rnd.Rand16() & mask_;
dst16[j] = rnd.Rand16() & mask_;
in[j] = src16[j] - dst16[j];
#endif
}
}
fwd_txfm_ref(in, coeff, pitch_, tx_type_);
if (bit_depth_ == VPX_BITS_8) {
ASM_REGISTER_STATE_CHECK(RunInvTxfm(coeff, dst, pitch_));
#if CONFIG_VP9_HIGHBITDEPTH
} else {
ASM_REGISTER_STATE_CHECK(
RunInvTxfm(coeff, CONVERT_TO_BYTEPTR(dst16), pitch_));
#endif
}
for (int j = 0; j < kNumCoeffs; ++j) {
#if CONFIG_VP9_HIGHBITDEPTH
const int diff =
bit_depth_ == VPX_BITS_8 ? dst[j] - src[j] : dst16[j] - src16[j];
#else
const int diff = dst[j] - src[j];
#endif
const uint32_t error = diff * diff;
EXPECT_GE(static_cast<uint32_t>(limit), error)
<< "Error: 4x4 IDCT has error " << error << " at index " << j;
}
}
}
int pitch_;
int tx_type_;
FhtFunc fwd_txfm_ref;
vpx_bit_depth_t bit_depth_;
int mask_;
};
class Trans4x4DCT : public Trans4x4TestBase,
public ::testing::TestWithParam<Dct4x4Param> {
public:
virtual ~Trans4x4DCT() {}
virtual void SetUp() {
fwd_txfm_ = GET_PARAM(0);
inv_txfm_ = GET_PARAM(1);
tx_type_ = GET_PARAM(2);
pitch_ = 4;
fwd_txfm_ref = fdct4x4_ref;
bit_depth_ = GET_PARAM(3);
mask_ = (1 << bit_depth_) - 1;
}
virtual void TearDown() { libvpx_test::ClearSystemState(); }
protected:
void RunFwdTxfm(const int16_t *in, tran_low_t *out, int stride) {
fwd_txfm_(in, out, stride);
}
void RunInvTxfm(const tran_low_t *out, uint8_t *dst, int stride) {
inv_txfm_(out, dst, stride);
}
FdctFunc fwd_txfm_;
IdctFunc inv_txfm_;
};
TEST_P(Trans4x4DCT, AccuracyCheck) { RunAccuracyCheck(1); }
TEST_P(Trans4x4DCT, CoeffCheck) { RunCoeffCheck(); }
TEST_P(Trans4x4DCT, MemCheck) { RunMemCheck(); }
TEST_P(Trans4x4DCT, InvAccuracyCheck) { RunInvAccuracyCheck(1); }
class Trans4x4HT : public Trans4x4TestBase,
public ::testing::TestWithParam<Ht4x4Param> {
public:
virtual ~Trans4x4HT() {}
virtual void SetUp() {
fwd_txfm_ = GET_PARAM(0);
inv_txfm_ = GET_PARAM(1);
tx_type_ = GET_PARAM(2);
pitch_ = 4;
fwd_txfm_ref = fht4x4_ref;
bit_depth_ = GET_PARAM(3);
mask_ = (1 << bit_depth_) - 1;
}
virtual void TearDown() { libvpx_test::ClearSystemState(); }
protected:
void RunFwdTxfm(const int16_t *in, tran_low_t *out, int stride) {
fwd_txfm_(in, out, stride, tx_type_);
}
void RunInvTxfm(const tran_low_t *out, uint8_t *dst, int stride) {
inv_txfm_(out, dst, stride, tx_type_);
}
FhtFunc fwd_txfm_;
IhtFunc inv_txfm_;
};
TEST_P(Trans4x4HT, AccuracyCheck) { RunAccuracyCheck(1); }
TEST_P(Trans4x4HT, CoeffCheck) { RunCoeffCheck(); }
TEST_P(Trans4x4HT, MemCheck) { RunMemCheck(); }
TEST_P(Trans4x4HT, InvAccuracyCheck) { RunInvAccuracyCheck(1); }
class Trans4x4WHT : public Trans4x4TestBase,
public ::testing::TestWithParam<Dct4x4Param> {
public:
virtual ~Trans4x4WHT() {}
virtual void SetUp() {
fwd_txfm_ = GET_PARAM(0);
inv_txfm_ = GET_PARAM(1);
tx_type_ = GET_PARAM(2);
pitch_ = 4;
fwd_txfm_ref = fwht4x4_ref;
bit_depth_ = GET_PARAM(3);
mask_ = (1 << bit_depth_) - 1;
}
virtual void TearDown() { libvpx_test::ClearSystemState(); }
protected:
void RunFwdTxfm(const int16_t *in, tran_low_t *out, int stride) {
fwd_txfm_(in, out, stride);
}
void RunInvTxfm(const tran_low_t *out, uint8_t *dst, int stride) {
inv_txfm_(out, dst, stride);
}
FdctFunc fwd_txfm_;
IdctFunc inv_txfm_;
};
TEST_P(Trans4x4WHT, AccuracyCheck) { RunAccuracyCheck(0); }
TEST_P(Trans4x4WHT, CoeffCheck) { RunCoeffCheck(); }
TEST_P(Trans4x4WHT, MemCheck) { RunMemCheck(); }
TEST_P(Trans4x4WHT, InvAccuracyCheck) { RunInvAccuracyCheck(0); }
using std::tr1::make_tuple;
#if CONFIG_VP9_HIGHBITDEPTH
INSTANTIATE_TEST_CASE_P(
C, Trans4x4DCT,
::testing::Values(
make_tuple(&vpx_highbd_fdct4x4_c, &idct4x4_10, 0, VPX_BITS_10),
make_tuple(&vpx_highbd_fdct4x4_c, &idct4x4_12, 0, VPX_BITS_12),
make_tuple(&vpx_fdct4x4_c, &vpx_idct4x4_16_add_c, 0, VPX_BITS_8)));
#else
INSTANTIATE_TEST_CASE_P(C, Trans4x4DCT,
::testing::Values(make_tuple(&vpx_fdct4x4_c,
&vpx_idct4x4_16_add_c, 0,
VPX_BITS_8)));
#endif // CONFIG_VP9_HIGHBITDEPTH
#if CONFIG_VP9_HIGHBITDEPTH
INSTANTIATE_TEST_CASE_P(
C, Trans4x4HT,
::testing::Values(
make_tuple(&vp9_highbd_fht4x4_c, &iht4x4_10, 0, VPX_BITS_10),
make_tuple(&vp9_highbd_fht4x4_c, &iht4x4_10, 1, VPX_BITS_10),
make_tuple(&vp9_highbd_fht4x4_c, &iht4x4_10, 2, VPX_BITS_10),
make_tuple(&vp9_highbd_fht4x4_c, &iht4x4_10, 3, VPX_BITS_10),
make_tuple(&vp9_highbd_fht4x4_c, &iht4x4_12, 0, VPX_BITS_12),
make_tuple(&vp9_highbd_fht4x4_c, &iht4x4_12, 1, VPX_BITS_12),
make_tuple(&vp9_highbd_fht4x4_c, &iht4x4_12, 2, VPX_BITS_12),
make_tuple(&vp9_highbd_fht4x4_c, &iht4x4_12, 3, VPX_BITS_12),
make_tuple(&vp9_fht4x4_c, &vp9_iht4x4_16_add_c, 0, VPX_BITS_8),
make_tuple(&vp9_fht4x4_c, &vp9_iht4x4_16_add_c, 1, VPX_BITS_8),
make_tuple(&vp9_fht4x4_c, &vp9_iht4x4_16_add_c, 2, VPX_BITS_8),
make_tuple(&vp9_fht4x4_c, &vp9_iht4x4_16_add_c, 3, VPX_BITS_8)));
#else
INSTANTIATE_TEST_CASE_P(
C, Trans4x4HT,
::testing::Values(
make_tuple(&vp9_fht4x4_c, &vp9_iht4x4_16_add_c, 0, VPX_BITS_8),
make_tuple(&vp9_fht4x4_c, &vp9_iht4x4_16_add_c, 1, VPX_BITS_8),
make_tuple(&vp9_fht4x4_c, &vp9_iht4x4_16_add_c, 2, VPX_BITS_8),
make_tuple(&vp9_fht4x4_c, &vp9_iht4x4_16_add_c, 3, VPX_BITS_8)));
#endif // CONFIG_VP9_HIGHBITDEPTH
#if CONFIG_VP9_HIGHBITDEPTH
INSTANTIATE_TEST_CASE_P(
C, Trans4x4WHT,
::testing::Values(
make_tuple(&vp9_highbd_fwht4x4_c, &iwht4x4_10, 0, VPX_BITS_10),
make_tuple(&vp9_highbd_fwht4x4_c, &iwht4x4_12, 0, VPX_BITS_12),
make_tuple(&vp9_fwht4x4_c, &vpx_iwht4x4_16_add_c, 0, VPX_BITS_8)));
#else
INSTANTIATE_TEST_CASE_P(C, Trans4x4WHT,
::testing::Values(make_tuple(&vp9_fwht4x4_c,
&vpx_iwht4x4_16_add_c, 0,
VPX_BITS_8)));
#endif // CONFIG_VP9_HIGHBITDEPTH
#if HAVE_NEON && !CONFIG_EMULATE_HARDWARE
INSTANTIATE_TEST_CASE_P(NEON, Trans4x4DCT,
::testing::Values(make_tuple(&vpx_fdct4x4_c,
&vpx_idct4x4_16_add_neon,
0, VPX_BITS_8)));
#if !CONFIG_VP9_HIGHBITDEPTH
INSTANTIATE_TEST_CASE_P(
NEON, Trans4x4HT,
::testing::Values(
make_tuple(&vp9_fht4x4_c, &vp9_iht4x4_16_add_neon, 0, VPX_BITS_8),
make_tuple(&vp9_fht4x4_c, &vp9_iht4x4_16_add_neon, 1, VPX_BITS_8),
make_tuple(&vp9_fht4x4_c, &vp9_iht4x4_16_add_neon, 2, VPX_BITS_8),
make_tuple(&vp9_fht4x4_c, &vp9_iht4x4_16_add_neon, 3, VPX_BITS_8)));
#endif // !CONFIG_VP9_HIGHBITDEPTH
#endif // HAVE_NEON && !CONFIG_EMULATE_HARDWARE
#if HAVE_SSE2 && !CONFIG_EMULATE_HARDWARE
INSTANTIATE_TEST_CASE_P(
SSE2, Trans4x4WHT,
::testing::Values(
make_tuple(&vp9_fwht4x4_sse2, &vpx_iwht4x4_16_add_c, 0, VPX_BITS_8),
make_tuple(&vp9_fwht4x4_c, &vpx_iwht4x4_16_add_sse2, 0, VPX_BITS_8)));
#endif
#if HAVE_SSE2 && !CONFIG_VP9_HIGHBITDEPTH && !CONFIG_EMULATE_HARDWARE
INSTANTIATE_TEST_CASE_P(SSE2, Trans4x4DCT,
::testing::Values(make_tuple(&vpx_fdct4x4_sse2,
&vpx_idct4x4_16_add_sse2,
0, VPX_BITS_8)));
INSTANTIATE_TEST_CASE_P(
SSE2, Trans4x4HT,
::testing::Values(
make_tuple(&vp9_fht4x4_sse2, &vp9_iht4x4_16_add_sse2, 0, VPX_BITS_8),
make_tuple(&vp9_fht4x4_sse2, &vp9_iht4x4_16_add_sse2, 1, VPX_BITS_8),
make_tuple(&vp9_fht4x4_sse2, &vp9_iht4x4_16_add_sse2, 2, VPX_BITS_8),
make_tuple(&vp9_fht4x4_sse2, &vp9_iht4x4_16_add_sse2, 3, VPX_BITS_8)));
#endif // HAVE_SSE2 && !CONFIG_VP9_HIGHBITDEPTH && !CONFIG_EMULATE_HARDWARE
#if HAVE_SSE2 && CONFIG_VP9_HIGHBITDEPTH && !CONFIG_EMULATE_HARDWARE
INSTANTIATE_TEST_CASE_P(
SSE2, Trans4x4DCT,
::testing::Values(
make_tuple(&vpx_highbd_fdct4x4_c, &idct4x4_10_sse2, 0, VPX_BITS_10),
make_tuple(&vpx_highbd_fdct4x4_sse2, &idct4x4_10_sse2, 0, VPX_BITS_10),
make_tuple(&vpx_highbd_fdct4x4_c, &idct4x4_12_sse2, 0, VPX_BITS_12),
make_tuple(&vpx_highbd_fdct4x4_sse2, &idct4x4_12_sse2, 0, VPX_BITS_12),
make_tuple(&vpx_fdct4x4_sse2, &vpx_idct4x4_16_add_c, 0, VPX_BITS_8)));
INSTANTIATE_TEST_CASE_P(
SSE2, Trans4x4HT,
::testing::Values(
make_tuple(&vp9_fht4x4_sse2, &vp9_iht4x4_16_add_c, 0, VPX_BITS_8),
make_tuple(&vp9_fht4x4_sse2, &vp9_iht4x4_16_add_c, 1, VPX_BITS_8),
make_tuple(&vp9_fht4x4_sse2, &vp9_iht4x4_16_add_c, 2, VPX_BITS_8),
make_tuple(&vp9_fht4x4_sse2, &vp9_iht4x4_16_add_c, 3, VPX_BITS_8)));
#endif // HAVE_SSE2 && CONFIG_VP9_HIGHBITDEPTH && !CONFIG_EMULATE_HARDWARE
#if HAVE_MSA && !CONFIG_VP9_HIGHBITDEPTH && !CONFIG_EMULATE_HARDWARE
INSTANTIATE_TEST_CASE_P(MSA, Trans4x4DCT,
::testing::Values(make_tuple(&vpx_fdct4x4_msa,
&vpx_idct4x4_16_add_msa, 0,
VPX_BITS_8)));
INSTANTIATE_TEST_CASE_P(
MSA, Trans4x4HT,
::testing::Values(
make_tuple(&vp9_fht4x4_msa, &vp9_iht4x4_16_add_msa, 0, VPX_BITS_8),
make_tuple(&vp9_fht4x4_msa, &vp9_iht4x4_16_add_msa, 1, VPX_BITS_8),
make_tuple(&vp9_fht4x4_msa, &vp9_iht4x4_16_add_msa, 2, VPX_BITS_8),
make_tuple(&vp9_fht4x4_msa, &vp9_iht4x4_16_add_msa, 3, VPX_BITS_8)));
#endif // HAVE_MSA && !CONFIG_VP9_HIGHBITDEPTH && !CONFIG_EMULATE_HARDWARE
} // namespace