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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/vp9_raw_bits_reader.h"
- #include <limits.h>
- #include <memory>
- #include "base/check_op.h"
- #include "media/base/bit_reader.h"
- namespace media {
- Vp9RawBitsReader::Vp9RawBitsReader() : valid_(true) {}
- Vp9RawBitsReader::~Vp9RawBitsReader() = default;
- void Vp9RawBitsReader::Initialize(const uint8_t* data, size_t size) {
- DCHECK(data);
- reader_ = std::make_unique<BitReader>(data, size);
- valid_ = true;
- }
- bool Vp9RawBitsReader::ReadBool() {
- DCHECK(reader_);
- if (!valid_)
- return false;
- int value = 0;
- valid_ = reader_->ReadBits(1, &value);
- return valid_ ? value == 1 : false;
- }
- int Vp9RawBitsReader::ReadLiteral(int bits) {
- DCHECK(reader_);
- if (!valid_)
- return 0;
- int value = 0;
- DCHECK_LT(static_cast<size_t>(bits), sizeof(value) * 8);
- valid_ = reader_->ReadBits(bits, &value);
- return valid_ ? value : 0;
- }
- int Vp9RawBitsReader::ReadSignedLiteral(int bits) {
- int value = ReadLiteral(bits);
- return ReadBool() ? -value : value;
- }
- size_t Vp9RawBitsReader::GetBytesRead() const {
- DCHECK(reader_);
- return (reader_->bits_read() + 7) / 8;
- }
- bool Vp9RawBitsReader::ConsumeTrailingBits() {
- DCHECK(reader_);
- int bits_left = GetBytesRead() * 8 - reader_->bits_read();
- return ReadLiteral(bits_left) == 0;
- }
- } // namespace media
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