1 // Copyright 2015 The Chromium Authors
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "media/filters/vp9_raw_bits_reader.h"
11 #include "base/check_op.h"
12 #include "media/base/bit_reader.h"
16 Vp9RawBitsReader::Vp9RawBitsReader() : valid_(true) {}
18 Vp9RawBitsReader::~Vp9RawBitsReader() = default;
20 void Vp9RawBitsReader::Initialize(const uint8_t* data, size_t size) {
22 reader_ = std::make_unique<BitReader>(data, size);
26 bool Vp9RawBitsReader::ReadBool() {
32 valid_ = reader_->ReadBits(1, &value);
33 return valid_ ? value == 1 : false;
36 int Vp9RawBitsReader::ReadLiteral(int bits) {
42 DCHECK_LT(static_cast<size_t>(bits), sizeof(value) * 8);
43 valid_ = reader_->ReadBits(bits, &value);
44 return valid_ ? value : 0;
47 int Vp9RawBitsReader::ReadSignedLiteral(int bits) {
48 int value = ReadLiteral(bits);
49 return ReadBool() ? -value : value;
52 size_t Vp9RawBitsReader::GetBytesRead() const {
54 return (reader_->bits_read() + 7) / 8;
57 bool Vp9RawBitsReader::ConsumeTrailingBits() {
59 int bits_left = GetBytesRead() * 8 - reader_->bits_read();
60 return ReadLiteral(bits_left) == 0;