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// 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_
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