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/*
* Copyright (c) 2017, Alliance for Open Media. All rights reserved.
*
* This source code is subject to the terms of the BSD 2 Clause License and
* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
* was not distributed with this source code in the LICENSE file, you can
* obtain it at www.aomedia.org/license/software. If the Alliance for Open
* Media Patent License 1.0 was not distributed with this source code in the
* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
*/
#include "gtest/gtest.h"
#include <cstdlib>
#include <memory>
#include <new>
#include "aom_dsp/entenc.h"
#include "aom_dsp/entdec.h"
TEST(EC_TEST, random_ec_test) {
od_ec_enc enc;
od_ec_dec dec;
int sz;
int i;
int ret;
unsigned int seed;
unsigned char *ptr;
uint32_t ptr_sz;
char *seed_str;
ret = 0;
seed_str = getenv("EC_TEST_SEED");
if (seed_str) {
seed = atoi(seed_str);
} else {
seed = 0xdaa1a;
}
srand(seed);
od_ec_enc_init(&enc, 1);
/*Test compatibility between multiple different encode/decode routines.*/
for (i = 0; i < 409600; i++) {
int j;
sz = rand() / ((RAND_MAX >> (rand() % 9U)) + 1U);
std::unique_ptr<unsigned[]> fz(new (std::nothrow) unsigned[sz]);
ASSERT_NE(fz, nullptr);
std::unique_ptr<unsigned[]> fts(new (std::nothrow) unsigned[sz]);
ASSERT_NE(fts, nullptr);
std::unique_ptr<unsigned[]> data(new (std::nothrow) unsigned[sz]);
ASSERT_NE(data, nullptr);
std::unique_ptr<unsigned[]> tell(new (std::nothrow) unsigned[sz + 1]);
ASSERT_NE(tell, nullptr);
std::unique_ptr<unsigned[]> enc_method(new (std::nothrow) unsigned[sz]);
ASSERT_NE(enc_method, nullptr);
od_ec_enc_reset(&enc);
tell[0] = od_ec_enc_tell_frac(&enc);
for (j = 0; j < sz; j++) {
data[j] = rand() / ((RAND_MAX >> 1) + 1);
fts[j] = CDF_PROB_BITS;
fz[j] = (rand() % (CDF_PROB_TOP - 2)) >> (CDF_PROB_BITS - fts[j]);
fz[j] = OD_MAXI(fz[j], 1);
enc_method[j] = 3 + (rand() & 1);
switch (enc_method[j]) {
case 3: {
od_ec_encode_bool_q15(&enc, data[j],
OD_ICDF(fz[j] << (CDF_PROB_BITS - fts[j])));
break;
}
case 4: {
uint16_t cdf[2];
cdf[0] = OD_ICDF(fz[j]);
cdf[1] = OD_ICDF(1U << fts[j]);
od_ec_encode_cdf_q15(&enc, data[j], cdf, 2);
break;
}
}
tell[j + 1] = od_ec_enc_tell_frac(&enc);
}
ptr = od_ec_enc_done(&enc, &ptr_sz);
ASSERT_NE(ptr, nullptr);
EXPECT_GE(((od_ec_enc_tell(&enc) + 7U) >> 3), ptr_sz)
<< "od_ec_enc_tell() lied: "
"there's "
<< ptr_sz << " bytes instead of " << ((od_ec_enc_tell(&enc) + 7) >> 3)
<< " (Random seed: " << seed << ")\n";
od_ec_dec_init(&dec, ptr, ptr_sz);
EXPECT_EQ(od_ec_dec_tell_frac(&dec), tell[0])
<< "od_ec_dec_tell() mismatch between encoder and decoder "
"at symbol 0: "
<< (unsigned)od_ec_dec_tell_frac(&dec) << " instead of " << tell[0]
<< " (Random seed: " << seed << ").\n";
for (j = 0; j < sz; j++) {
int dec_method;
unsigned int sym = data[j] + 1; // Initialize sym to an invalid value.
dec_method = 3 + (rand() & 1);
switch (dec_method) {
case 3: {
sym = od_ec_decode_bool_q15(
&dec, OD_ICDF(fz[j] << (CDF_PROB_BITS - fts[j])));
break;
}
case 4: {
uint16_t cdf[2];
cdf[0] = OD_ICDF(fz[j]);
cdf[1] = OD_ICDF(1U << fts[j]);
sym = od_ec_decode_cdf_q15(&dec, cdf, 2);
break;
}
}
EXPECT_EQ(sym, data[j])
<< "Decoded " << sym << " instead of " << data[j]
<< " with fz=" << fz[j] << " and ftb=" << fts[j] << "at position "
<< j << " of " << sz << " (Random seed: " << seed << ").\n"
<< "Encoding method: " << enc_method[j]
<< " decoding method: " << dec_method << "\n";
EXPECT_EQ(od_ec_dec_tell_frac(&dec), tell[j + 1])
<< "od_ec_dec_tell() mismatch between encoder and "
"decoder at symbol "
<< j + 1 << ": " << (unsigned)od_ec_dec_tell_frac(&dec)
<< " instead of " << tell[j + 1] << " (Random seed: " << seed
<< ").\n";
}
}
od_ec_enc_reset(&enc);
od_ec_encode_bool_q15(&enc, 0, OD_ICDF(16384));
od_ec_encode_bool_q15(&enc, 0, OD_ICDF(16384));
od_ec_encode_bool_q15(&enc, 0, OD_ICDF(16384));
od_ec_encode_bool_q15(&enc, 0, OD_ICDF(16384));
od_ec_encode_bool_q15(&enc, 0, OD_ICDF(24576));
od_ec_enc_reset(&enc);
od_ec_encode_bool_q15(&enc, 0, OD_ICDF(16384));
od_ec_encode_bool_q15(&enc, 0, OD_ICDF(16384));
od_ec_encode_bool_q15(&enc, 1, OD_ICDF(32256));
od_ec_encode_bool_q15(&enc, 0, OD_ICDF(24576));
ptr = od_ec_enc_done(&enc, &ptr_sz);
ASSERT_NE(ptr, nullptr);
EXPECT_EQ(ptr_sz, 2u);
EXPECT_EQ(ptr[0], 63);
od_ec_enc_clear(&enc);
EXPECT_EQ(ret, 0);
}
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