blob: b3f230b31884384e3b5a6de27d27c85dd8256111 [file] [log] [blame]
// Copyright (c) 2012 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 <stdint.h>
#include <string>
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "media/base/bit_reader_core.h"
#include "media/base/media_export.h"
namespace media {
class MEDIA_EXPORT BitReader
: NON_EXPORTED_BASE(private BitReaderCore::ByteStreamProvider) {
// Initialize the reader to start reading at |data|, |size| being size
// of |data| in bytes.
BitReader(const uint8_t* data, int size);
~BitReader() override;
template<typename T> bool ReadBits(int num_bits, T* out) {
return bit_reader_core_.ReadBits(num_bits, out);
bool ReadFlag(bool* flag) {
return bit_reader_core_.ReadFlag(flag);
// Read |num_bits| of binary data into |str|. |num_bits| must be a positive
// multiple of 8. This is not efficient for extracting large strings.
// If false is returned, |str| may not be valid.
bool ReadString(int num_bits, std::string* str);
bool SkipBits(int num_bits) {
return bit_reader_core_.SkipBits(num_bits);
int bits_available() const {
return initial_size_ * 8 - bits_read();
int bits_read() const {
return bit_reader_core_.bits_read();
// BitReaderCore::ByteStreamProvider implementation.
int GetBytes(int max_n, const uint8_t** out) override;
// Total number of bytes that was initially passed to BitReader.
const int initial_size_;
// Pointer to the next unread byte in the stream.
const uint8_t* data_;
// Bytes left in the stream.
int bytes_left_;
BitReaderCore bit_reader_core_;
} // namespace media