blob: 52d071bd232eec50ffe09b6386fabc35eb72ebc7 [file] [log] [blame]
// 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 "cobalt/media/filters/vp9_raw_bits_reader.h"
#include <limits.h>
#include "base/logging.h"
#include "cobalt/media/base/bit_reader.h"
#include "starboard/types.h"
namespace cobalt {
namespace media {
Vp9RawBitsReader::Vp9RawBitsReader() : valid_(true) {}
Vp9RawBitsReader::~Vp9RawBitsReader() {}
void Vp9RawBitsReader::Initialize(const uint8_t* data, size_t size) {
DCHECK(data);
reader_.reset(new 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
} // namespace cobalt