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// 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.
#ifndef MEDIA_BASE_BIT_READER_H_
#define MEDIA_BASE_BIT_READER_H_
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/scoped_ptr.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) {
public:
// Initialize the reader to start reading at |data|, |size| being size
// of |data| in bytes.
BitReader(const uint8* 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);
}
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();
}
private:
// BitReaderCore::ByteStreamProvider implementation.
int GetBytes(int max_n, const uint8** 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* data_;
// Bytes left in the stream.
int bytes_left_;
BitReaderCore bit_reader_core_;
DISALLOW_COPY_AND_ASSIGN(BitReader);
};
} // namespace media
#endif // MEDIA_BASE_BIT_READER_H_
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