offset_byte_queue.h

// 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_OFFSET_BYTE_QUEUE_H_
#define MEDIA_BASE_OFFSET_BYTE_QUEUE_H_

#include <stdint.h>

#include "packager/media/base/byte_queue.h"

namespace edash_packager {
namespace media {

class OffsetByteQueue {
 public:
  OffsetByteQueue();
  ~OffsetByteQueue();

  void Reset();
  void Push(const uint8_t* buf, int size);
  void Peek(const uint8_t** buf, int* size);
  void Pop(int count);

  void PeekAt(int64_t offset, const uint8_t** buf, int* size);

  bool Trim(int64_t max_offset);

  int64_t head() { return head_; }
  int64_t tail() { return head_ + size_; }

 private:
  // Synchronize |buf_| and |size_| with |queue_|.
  void Sync();

  ByteQueue queue_;
  const uint8_t* buf_;
  int size_;
  int64_t head_;

  DISALLOW_COPY_AND_ASSIGN(OffsetByteQueue);
};

}  // namespace media
}  // namespace edash_packager

#endif  // MEDIA_BASE_OFFSET_BYTE_QUEUE_H_