fdct4x4_test.cc 5.69 KB
Newer Older
Daniel Kang's avatar
Daniel Kang committed
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
/*
 *  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"

extern "C" {
18
#include "vp9_rtcd.h"
Daniel Kang's avatar
Daniel Kang committed
19
20
}

Daniel Kang's avatar
Daniel Kang committed
21
#include "acm_random.h"
Daniel Kang's avatar
Daniel Kang committed
22
23
#include "vpx/vpx_integer.h"

Daniel Kang's avatar
Daniel Kang committed
24
using libvpx_test::ACMRandom;
Daniel Kang's avatar
Daniel Kang committed
25

Daniel Kang's avatar
Daniel Kang committed
26
namespace {
27
28
void fdct4x4(int16_t *in, int16_t *out, uint8_t */*dst*/,
             int stride, int /*tx_type*/) {
Jingning Han's avatar
Jingning Han committed
29
30
  vp9_short_fdct4x4_c(in, out, stride);
}
31
32
void idct4x4_add(int16_t */*in*/, int16_t *out, uint8_t *dst,
                 int stride, int /*tx_type*/) {
Jingning Han's avatar
Jingning Han committed
33
34
  vp9_short_idct4x4_add_c(out, dst, stride >> 1);
}
35
36
void fht4x4(int16_t *in, int16_t *out, uint8_t */*dst*/,
            int stride, int tx_type) {
Jingning Han's avatar
Jingning Han committed
37
38
  vp9_short_fht4x4_c(in, out, stride >> 1, tx_type);
}
39
void iht4x4_add(int16_t */*in*/, int16_t *out, uint8_t *dst,
Jingning Han's avatar
Jingning Han committed
40
41
42
43
44
45
                int stride, int tx_type) {
  vp9_short_iht4x4_add_c(out, dst, stride >> 1, tx_type);
}

class FwdTrans4x4Test : public ::testing::TestWithParam<int> {
 public:
Jingning Han's avatar
Jingning Han committed
46
  FwdTrans4x4Test() { SetUpTestTxfm(); }
Jingning Han's avatar
Jingning Han committed
47
48
49
  ~FwdTrans4x4Test() {}

  void SetUpTestTxfm() {
Jingning Han's avatar
Jingning Han committed
50
51
    tx_type_ = GetParam();
    if (tx_type_ == 0) {
52
53
      fwd_txfm_ = fdct4x4;
      inv_txfm_ = idct4x4_add;
Jingning Han's avatar
Jingning Han committed
54
    } else {
55
56
      fwd_txfm_ = fht4x4;
      inv_txfm_ = iht4x4_add;
Jingning Han's avatar
Jingning Han committed
57
58
59
60
61
62
    }
  }

 protected:
  void RunFwdTxfm(int16_t *in, int16_t *out, uint8_t *dst,
                  int stride, int tx_type) {
63
    (*fwd_txfm_)(in, out, dst, stride, tx_type);
Jingning Han's avatar
Jingning Han committed
64
65
66
67
  }

  void RunInvTxfm(int16_t *in, int16_t *out, uint8_t *dst,
                  int stride, int tx_type) {
68
    (*inv_txfm_)(in, out, dst, stride, tx_type);
Jingning Han's avatar
Jingning Han committed
69
70
  }

Jingning Han's avatar
Jingning Han committed
71
  int tx_type_;
72
  void (*fwd_txfm_)(int16_t *in, int16_t *out, uint8_t *dst,
Jingning Han's avatar
Jingning Han committed
73
                   int stride, int tx_type);
74
  void (*inv_txfm_)(int16_t *in, int16_t *out, uint8_t *dst,
Jingning Han's avatar
Jingning Han committed
75
76
                   int stride, int tx_type);
};
Daniel Kang's avatar
Daniel Kang committed
77

Jingning Han's avatar
Jingning Han committed
78
TEST_P(FwdTrans4x4Test, SignBiasCheck) {
Daniel Kang's avatar
Daniel Kang committed
79
80
81
82
83
84
85
86
87
88
89
90
91
  ACMRandom rnd(ACMRandom::DeterministicSeed());
  int16_t test_input_block[16];
  int16_t test_output_block[16];
  const int pitch = 8;
  int count_sign_block[16][2];
  const int count_test_block = 1000000;

  memset(count_sign_block, 0, sizeof(count_sign_block));
  for (int i = 0; i < count_test_block; ++i) {
    // Initialize a test block with input range [-255, 255].
    for (int j = 0; j < 16; ++j)
      test_input_block[j] = rnd.Rand8() - rnd.Rand8();

Jingning Han's avatar
Jingning Han committed
92
    RunFwdTxfm(test_input_block, test_output_block, NULL, pitch, tx_type_);
Daniel Kang's avatar
Daniel Kang committed
93
94
95
96
97
98
99
100
101
102
103
104
105

    for (int j = 0; j < 16; ++j) {
      if (test_output_block[j] < 0)
        ++count_sign_block[j][0];
      else if (test_output_block[j] > 0)
        ++count_sign_block[j][1];
    }
  }

  for (int j = 0; j < 16; ++j) {
    const bool bias_acceptable = (abs(count_sign_block[j][0] -
                                      count_sign_block[j][1]) < 10000);
    EXPECT_TRUE(bias_acceptable)
Jingning Han's avatar
Jingning Han committed
106
107
        << "Error: 4x4 FDCT/FHT has a sign bias > 1%"
        << " for input range [-255, 255] at index " << j
Jingning Han's avatar
Jingning Han committed
108
        << " tx_type " << tx_type_;
Daniel Kang's avatar
Daniel Kang committed
109
110
111
112
113
114
115
116
  }

  memset(count_sign_block, 0, sizeof(count_sign_block));
  for (int i = 0; i < count_test_block; ++i) {
    // Initialize a test block with input range [-15, 15].
    for (int j = 0; j < 16; ++j)
      test_input_block[j] = (rnd.Rand8() >> 4) - (rnd.Rand8() >> 4);

Jingning Han's avatar
Jingning Han committed
117
    RunFwdTxfm(test_input_block, test_output_block, NULL, pitch, tx_type_);
Daniel Kang's avatar
Daniel Kang committed
118
119
120
121
122
123
124
125
126
127
128
129
130

    for (int j = 0; j < 16; ++j) {
      if (test_output_block[j] < 0)
        ++count_sign_block[j][0];
      else if (test_output_block[j] > 0)
        ++count_sign_block[j][1];
    }
  }

  for (int j = 0; j < 16; ++j) {
    const bool bias_acceptable = (abs(count_sign_block[j][0] -
                                      count_sign_block[j][1]) < 100000);
    EXPECT_TRUE(bias_acceptable)
Jingning Han's avatar
Jingning Han committed
131
        << "Error: 4x4 FDCT/FHT has a sign bias > 10%"
Daniel Kang's avatar
Daniel Kang committed
132
133
        << " for input range [-15, 15] at index " << j;
  }
Jingning Han's avatar
Jingning Han committed
134
}
Daniel Kang's avatar
Daniel Kang committed
135

Jingning Han's avatar
Jingning Han committed
136
TEST_P(FwdTrans4x4Test, RoundTripErrorCheck) {
Daniel Kang's avatar
Daniel Kang committed
137
  ACMRandom rnd(ACMRandom::DeterministicSeed());
Jingning Han's avatar
Jingning Han committed
138

Daniel Kang's avatar
Daniel Kang committed
139
140
141
142
143
144
  int max_error = 0;
  double total_error = 0;
  const int count_test_block = 1000000;
  for (int i = 0; i < count_test_block; ++i) {
    int16_t test_input_block[16];
    int16_t test_temp_block[16];
Scott LaVarnway's avatar
Scott LaVarnway committed
145
    uint8_t dst[16], src[16];
Daniel Kang's avatar
Daniel Kang committed
146

Scott LaVarnway's avatar
Scott LaVarnway committed
147
148
149
150
    for (int j = 0; j < 16; ++j) {
      src[j] = rnd.Rand8();
      dst[j] = rnd.Rand8();
    }
Daniel Kang's avatar
Daniel Kang committed
151
152
    // Initialize a test block with input range [-255, 255].
    for (int j = 0; j < 16; ++j)
Scott LaVarnway's avatar
Scott LaVarnway committed
153
      test_input_block[j] = src[j] - dst[j];
Daniel Kang's avatar
Daniel Kang committed
154
155

    const int pitch = 8;
Jingning Han's avatar
Jingning Han committed
156
    RunFwdTxfm(test_input_block, test_temp_block, dst, pitch, tx_type_);
157
158
159
160
161
162
163
164
165
166
167
168
169

    for (int j = 0; j < 16; ++j) {
        if(test_temp_block[j] > 0) {
          test_temp_block[j] += 2;
          test_temp_block[j] /= 4;
          test_temp_block[j] *= 4;
        } else {
          test_temp_block[j] -= 2;
          test_temp_block[j] /= 4;
          test_temp_block[j] *= 4;
        }
    }

Jingning Han's avatar
Jingning Han committed
170
    // inverse transform and reconstruct the pixel block
Jingning Han's avatar
Jingning Han committed
171
    RunInvTxfm(test_input_block, test_temp_block, dst, pitch, tx_type_);
Daniel Kang's avatar
Daniel Kang committed
172
173

    for (int j = 0; j < 16; ++j) {
Scott LaVarnway's avatar
Scott LaVarnway committed
174
      const int diff = dst[j] - src[j];
Daniel Kang's avatar
Daniel Kang committed
175
176
177
178
179
180
181
      const int error = diff * diff;
      if (max_error < error)
        max_error = error;
      total_error += error;
    }
  }
  EXPECT_GE(1, max_error)
Jingning Han's avatar
Jingning Han committed
182
      << "Error: FDCT/IDCT or FHT/IHT has an individual roundtrip error > 1";
Daniel Kang's avatar
Daniel Kang committed
183
184

  EXPECT_GE(count_test_block, total_error)
Jingning Han's avatar
Jingning Han committed
185
      << "Error: FDCT/IDCT or FHT/IHT has average "
186
      << "roundtrip error > 1 per block";
Jingning Han's avatar
Jingning Han committed
187
}
Daniel Kang's avatar
Daniel Kang committed
188

Jingning Han's avatar
Jingning Han committed
189
INSTANTIATE_TEST_CASE_P(VP9, FwdTrans4x4Test, ::testing::Range(0, 4));
Daniel Kang's avatar
Daniel Kang committed
190
}  // namespace