1 /*
2 * Copyright (c) 2017, Alliance for Open Media. All rights reserved.
3 *
4 * This source code is subject to the terms of the BSD 2 Clause License and
5 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
6 * was not distributed with this source code in the LICENSE file, you can
7 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
8 * Media Patent License 1.0 was not distributed with this source code in the
9 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
10 */
11
12 #include "gtest/gtest.h"
13
14 #include <cstdlib>
15 #include <memory>
16 #include <new>
17
18 #include "aom_dsp/entenc.h"
19 #include "aom_dsp/entdec.h"
20
TEST(EC_TEST,random_ec_test)21 TEST(EC_TEST, random_ec_test) {
22 od_ec_enc enc;
23 od_ec_dec dec;
24 int sz;
25 int i;
26 int ret;
27 unsigned int seed;
28 unsigned char *ptr;
29 uint32_t ptr_sz;
30 char *seed_str;
31 ret = 0;
32 seed_str = getenv("EC_TEST_SEED");
33 if (seed_str) {
34 seed = atoi(seed_str);
35 } else {
36 seed = 0xdaa1a;
37 }
38 srand(seed);
39 od_ec_enc_init(&enc, 1);
40 /*Test compatibility between multiple different encode/decode routines.*/
41 for (i = 0; i < 409600; i++) {
42 int j;
43 sz = rand() / ((RAND_MAX >> (rand() % 9U)) + 1U);
44 std::unique_ptr<unsigned[]> fz(new (std::nothrow) unsigned[sz]);
45 ASSERT_NE(fz, nullptr);
46 std::unique_ptr<unsigned[]> fts(new (std::nothrow) unsigned[sz]);
47 ASSERT_NE(fts, nullptr);
48 std::unique_ptr<unsigned[]> data(new (std::nothrow) unsigned[sz]);
49 ASSERT_NE(data, nullptr);
50 std::unique_ptr<unsigned[]> tell(new (std::nothrow) unsigned[sz + 1]);
51 ASSERT_NE(tell, nullptr);
52 std::unique_ptr<unsigned[]> enc_method(new (std::nothrow) unsigned[sz]);
53 ASSERT_NE(enc_method, nullptr);
54 od_ec_enc_reset(&enc);
55 tell[0] = od_ec_enc_tell_frac(&enc);
56 for (j = 0; j < sz; j++) {
57 data[j] = rand() / ((RAND_MAX >> 1) + 1);
58
59 fts[j] = CDF_PROB_BITS;
60 fz[j] = (rand() % (CDF_PROB_TOP - 2)) >> (CDF_PROB_BITS - fts[j]);
61 fz[j] = OD_MAXI(fz[j], 1);
62 enc_method[j] = 3 + (rand() & 1);
63 switch (enc_method[j]) {
64 case 3: {
65 od_ec_encode_bool_q15(&enc, data[j],
66 OD_ICDF(fz[j] << (CDF_PROB_BITS - fts[j])));
67 break;
68 }
69 case 4: {
70 uint16_t cdf[2];
71 cdf[0] = OD_ICDF(fz[j]);
72 cdf[1] = OD_ICDF(1U << fts[j]);
73 od_ec_encode_cdf_q15(&enc, data[j], cdf, 2);
74 break;
75 }
76 }
77
78 tell[j + 1] = od_ec_enc_tell_frac(&enc);
79 }
80 ptr = od_ec_enc_done(&enc, &ptr_sz);
81 ASSERT_NE(ptr, nullptr);
82 EXPECT_GE(((od_ec_enc_tell(&enc) + 7U) >> 3), ptr_sz)
83 << "od_ec_enc_tell() lied: "
84 "there's "
85 << ptr_sz << " bytes instead of " << ((od_ec_enc_tell(&enc) + 7) >> 3)
86 << " (Random seed: " << seed << ")\n";
87 od_ec_dec_init(&dec, ptr, ptr_sz);
88 EXPECT_EQ(od_ec_dec_tell_frac(&dec), tell[0])
89 << "od_ec_dec_tell() mismatch between encoder and decoder "
90 "at symbol 0: "
91 << (unsigned)od_ec_dec_tell_frac(&dec) << " instead of " << tell[0]
92 << " (Random seed: " << seed << ").\n";
93 for (j = 0; j < sz; j++) {
94 int dec_method;
95 unsigned int sym = data[j] + 1; // Initialize sym to an invalid value.
96
97 dec_method = 3 + (rand() & 1);
98
99 switch (dec_method) {
100 case 3: {
101 sym = od_ec_decode_bool_q15(
102 &dec, OD_ICDF(fz[j] << (CDF_PROB_BITS - fts[j])));
103 break;
104 }
105 case 4: {
106 uint16_t cdf[2];
107 cdf[0] = OD_ICDF(fz[j]);
108 cdf[1] = OD_ICDF(1U << fts[j]);
109 sym = od_ec_decode_cdf_q15(&dec, cdf, 2);
110 break;
111 }
112 }
113
114 EXPECT_EQ(sym, data[j])
115 << "Decoded " << sym << " instead of " << data[j]
116 << " with fz=" << fz[j] << " and ftb=" << fts[j] << "at position "
117 << j << " of " << sz << " (Random seed: " << seed << ").\n"
118 << "Encoding method: " << enc_method[j]
119 << " decoding method: " << dec_method << "\n";
120 EXPECT_EQ(od_ec_dec_tell_frac(&dec), tell[j + 1])
121 << "od_ec_dec_tell() mismatch between encoder and "
122 "decoder at symbol "
123 << j + 1 << ": " << (unsigned)od_ec_dec_tell_frac(&dec)
124 << " instead of " << tell[j + 1] << " (Random seed: " << seed
125 << ").\n";
126 }
127 }
128 od_ec_enc_reset(&enc);
129 od_ec_encode_bool_q15(&enc, 0, OD_ICDF(16384));
130 od_ec_encode_bool_q15(&enc, 0, OD_ICDF(16384));
131 od_ec_encode_bool_q15(&enc, 0, OD_ICDF(16384));
132 od_ec_encode_bool_q15(&enc, 0, OD_ICDF(16384));
133 od_ec_encode_bool_q15(&enc, 0, OD_ICDF(24576));
134 od_ec_enc_patch_initial_bits(&enc, 3, 2);
135 EXPECT_FALSE(enc.error) << "od_ec_enc_patch_initial_bits() failed.\n";
136 od_ec_enc_patch_initial_bits(&enc, 0, 5);
137 EXPECT_TRUE(enc.error)
138 << "od_ec_enc_patch_initial_bits() didn't fail when it should have.\n";
139 od_ec_enc_reset(&enc);
140 od_ec_encode_bool_q15(&enc, 0, OD_ICDF(16384));
141 od_ec_encode_bool_q15(&enc, 0, OD_ICDF(16384));
142 od_ec_encode_bool_q15(&enc, 1, OD_ICDF(32256));
143 od_ec_encode_bool_q15(&enc, 0, OD_ICDF(24576));
144 od_ec_enc_patch_initial_bits(&enc, 0, 2);
145 EXPECT_FALSE(enc.error) << "od_ec_enc_patch_initial_bits() failed.\n";
146 ptr = od_ec_enc_done(&enc, &ptr_sz);
147 ASSERT_NE(ptr, nullptr);
148 EXPECT_EQ(ptr_sz, 2u);
149 EXPECT_EQ(ptr[0], 63)
150 << "Got " << ptr[0]
151 << " when expecting 63 for od_ec_enc_patch_initial_bits().\n";
152 od_ec_enc_clear(&enc);
153 EXPECT_EQ(ret, 0);
154 }
155