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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/filters/vp8_bool_decoder.h"
#include <stddef.h>
#include <stdint.h>
#include <limits>
#include "base/macros.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace media {
const static size_t NUM_BITS_TO_TEST = 100;
namespace {
// 100 zeros with probability of 0x80.
const uint8_t kDataZerosAndEvenProbabilities[] = {
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00};
// 100 ones with probability of 0x80.
const uint8_t kDataOnesAndEvenProbabilities[] = {
0xfe, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
0xff, 0xf0, 0x20};
// [0, 1, 0, 1, ..., 1] with probability [0, 1, 2, 3, ..., 99].
const uint8_t kDataParitiesAndIncreasingProbabilities[] = {
0x00, 0x02, 0x08, 0x31, 0x8e, 0xca, 0xab, 0xe2, 0xc8, 0x31, 0x12,
0xb3, 0x2c, 0x19, 0x90, 0xc6, 0x6a, 0xeb, 0x17, 0x52, 0x30};
} // namespace
class Vp8BoolDecoderTest : public ::testing::Test {
public:
Vp8BoolDecoderTest() {}
protected:
// Fixture member, the bool decoder to be tested.
Vp8BoolDecoder bd_;
private:
DISALLOW_COPY_AND_ASSIGN(Vp8BoolDecoderTest);
};
#define INITIALIZE(data) ASSERT_TRUE(bd_.Initialize(data, sizeof(data)));
TEST_F(Vp8BoolDecoderTest, DecodeBoolsWithZerosAndEvenProbabilities) {
INITIALIZE(kDataZerosAndEvenProbabilities);
ASSERT_EQ(0u, bd_.BitOffset());
for (size_t i = 0; i < NUM_BITS_TO_TEST; ++i) {
bool out = true;
ASSERT_TRUE(bd_.ReadBool(&out, 0x80));
ASSERT_FALSE(out);
ASSERT_EQ(i, bd_.BitOffset());
}
}
TEST_F(Vp8BoolDecoderTest, DecodeLiteralsWithZerosAndEvenProbabilities) {
INITIALIZE(kDataZerosAndEvenProbabilities);
int value = 1;
ASSERT_TRUE(bd_.ReadLiteral(1, &value));
ASSERT_EQ(0, value);
value = 1;
ASSERT_TRUE(bd_.ReadLiteral(32, &value));
ASSERT_EQ(0, value);
value = 1;
ASSERT_TRUE(bd_.ReadLiteralWithSign(1, &value));
ASSERT_EQ(0, value);
value = 1;
ASSERT_TRUE(bd_.ReadLiteralWithSign(31, &value));
ASSERT_EQ(0, value);
}
TEST_F(Vp8BoolDecoderTest, DecodeBoolsWithOnesAndEvenProbabilities) {
INITIALIZE(kDataOnesAndEvenProbabilities);
ASSERT_EQ(0u, bd_.BitOffset());
for (size_t i = 0; i < NUM_BITS_TO_TEST; ++i) {
bool out = false;
ASSERT_TRUE(bd_.ReadBool(&out, 0x80));
ASSERT_TRUE(out);
ASSERT_EQ(i + 1, bd_.BitOffset());
}
}
TEST_F(Vp8BoolDecoderTest, DecodeLiteralsWithOnesAndEvenProbabilities) {
INITIALIZE(kDataOnesAndEvenProbabilities);
int value = 0;
ASSERT_TRUE(bd_.ReadLiteral(1, &value));
EXPECT_EQ(1, value);
value = 0;
ASSERT_TRUE(bd_.ReadLiteral(31, &value));
EXPECT_EQ(0x7FFFFFFF, value);
value = 0;
ASSERT_TRUE(bd_.ReadLiteralWithSign(1, &value));
EXPECT_EQ(-1, value);
value = 0;
ASSERT_TRUE(bd_.ReadLiteralWithSign(31, &value));
EXPECT_EQ(-0x7FFFFFFF, value);
}
TEST_F(Vp8BoolDecoderTest, DecodeBoolsWithParitiesAndIncreasingProbabilities) {
INITIALIZE(kDataParitiesAndIncreasingProbabilities);
for (size_t i = 0; i < NUM_BITS_TO_TEST; ++i) {
bool out = !(i & 1);
ASSERT_LE(i, std::numeric_limits<uint8_t>::max());
ASSERT_TRUE(bd_.ReadBool(&out, static_cast<uint8_t>(i)));
EXPECT_EQ(out, !!(i & 1));
}
}
} // namespace media
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