123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125 |
- // 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/parsers/vp8_bool_decoder.h"
- #include <stddef.h>
- #include <stdint.h>
- #include <limits>
- #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() = default;
- Vp8BoolDecoderTest(const Vp8BoolDecoderTest&) = delete;
- Vp8BoolDecoderTest& operator=(const Vp8BoolDecoderTest&) = delete;
- protected:
- // Fixture member, the bool decoder to be tested.
- Vp8BoolDecoder bd_;
- };
- #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
|