59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef MEDIA_BASE_BYTE_QUEUE_H_
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#define MEDIA_BASE_BYTE_QUEUE_H_
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#include "base/basictypes.h"
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#include "base/memory/scoped_ptr.h"
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#include "media/base/media_export.h"
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namespace media {
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// Represents a queue of bytes.
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// Data is added to the end of the queue via an Push() call and removed via
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// Pop(). The contents of the queue can be observed via the Peek() method.
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// This class manages the underlying storage of the queue and tries to minimize
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// the number of buffer copies when data is appended and removed.
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class MEDIA_EXPORT ByteQueue {
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public:
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ByteQueue();
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~ByteQueue();
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// Reset the queue to the empty state.
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void Reset();
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// Appends new bytes onto the end of the queue.
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void Push(const uint8* data, int size);
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// Get a pointer to the front of the queue and the queue size.
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// These values are only valid until the next Push() or
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// Pop() call.
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void Peek(const uint8** data, int* size) const;
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// Remove |count| bytes from the front of the queue.
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void Pop(int count);
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private:
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// Returns a pointer to the front of the queue.
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uint8* front() const;
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scoped_ptr<uint8[]> buffer_;
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// Size of |buffer_|.
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size_t size_;
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// Offset from the start of |buffer_| that marks the front of the queue.
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size_t offset_;
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// Number of bytes stored in the queue.
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int used_;
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DISALLOW_COPY_AND_ASSIGN(ByteQueue);
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};
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} // namespace media
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#endif // MEDIA_BASE_BYTE_QUEUE_H_
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