Merging SeekableBuffer and BufferQueue

media/base/buffer_queue.h

-// Copyright (c) 2009 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.
-
-// BufferQueue is a simple Buffer manager that handles requests for data
-// while hiding Buffer boundaries, treating its internal queue of Buffers
-// as a contiguous region.
-//
-// This class is not threadsafe and requires external locking.
-
-#ifndef MEDIA_BASE_BUFFER_QUEUE_H_
-#define MEDIA_BASE_BUFFER_QUEUE_H_
-
-#include <deque>
-
-#include "base/ref_counted.h"
-#include "base/time.h"
-
-namespace media {
-
-class Buffer;
-
-class BufferQueue {
- public:
-  BufferQueue();
-  ~BufferQueue();
-
-  // Clears |queue_|.
-  void Clear();
-
-  // Advances front pointer |bytes_to_be_consumed| bytes and discards
-  // "consumed" buffers.
-  void Consume(size_t bytes_to_be_consumed);
-
-  // Tries to copy |bytes| bytes from our data to |dest|. Returns the number
-  // of bytes successfully copied.
-  size_t Copy(uint8* dest, size_t bytes);
-
-  // Enqueues |buffer_in| and adds a reference.
-  void Enqueue(Buffer* buffer_in);
-
-  // Returns the current timestamp, taking into account |data_offset_|.
-  base::TimeDelta GetTime();
-
-  // Returns true if the |queue_| is empty.
-  bool IsEmpty();
-
-  // Returns the number of bytes in the |queue_|.
-  size_t SizeInBytes();
-
- private:
-  // Queued audio data.
-  std::deque< scoped_refptr<Buffer> > queue_;
-
-  // Remembers the amount of remaining audio data in the front buffer.
-  size_t data_offset_;
-
-  // Keeps track of the |queue_| size in bytes.
-  size_t size_in_bytes_;
-
-  // Keeps track of the most recent time we've seen in case the |queue_| is
-  // empty when our owner asks what time it is.
-  base::TimeDelta most_recent_time_;
-
-  DISALLOW_COPY_AND_ASSIGN(BufferQueue);
-};
-
-}  // namespace media
-
-#endif  // MEDIA_BASE_BUFFER_QUEUE_H_