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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #ifndef MEDIA_BASE_BYTE_QUEUE_H_ | 5 #ifndef MEDIA_BASE_BYTE_QUEUE_H_ |
| 6 #define MEDIA_BASE_BYTE_QUEUE_H_ | 6 #define MEDIA_BASE_BYTE_QUEUE_H_ |
| 7 | 7 |
| 8 #include "base/basictypes.h" | |
| 9 #include "base/memory/scoped_ptr.h" | 8 #include "base/memory/scoped_ptr.h" |
| 10 #include "media/base/media_export.h" | 9 #include "media/base/media_export.h" |
| 11 | 10 |
| 12 namespace media { | 11 namespace media { |
| 13 | 12 |
| 14 // Represents a queue of bytes. | 13 // Represents a queue of bytes. |
| 15 // Data is added to the end of the queue via an Push() call and removed via | 14 // Data is added to the end of the queue via an Push() call and removed via |
| 16 // Pop(). The contents of the queue can be observed via the Peek() method. | 15 // Pop(). The contents of the queue can be observed via the Peek() method. |
| 17 // This class manages the underlying storage of the queue and tries to minimize | 16 // This class manages the underlying storage of the queue and tries to minimize |
| 18 // the number of buffer copies when data is appended and removed. | 17 // the number of buffer copies when data is appended and removed. |
| 19 class MEDIA_EXPORT ByteQueue { | 18 class MEDIA_EXPORT ByteQueue { |
| 20 public: | 19 public: |
| 21 ByteQueue(); | 20 ByteQueue(); |
| 22 ~ByteQueue(); | 21 ~ByteQueue(); |
| 23 | 22 |
| 24 // Reset the queue to the empty state. | 23 // Reset the queue to the empty state. |
| 25 void Reset(); | 24 void Reset(); |
| 26 | 25 |
| 27 // Appends new bytes onto the end of the queue. | 26 // Appends new bytes onto the end of the queue. |
| 28 void Push(const uint8* data, int size); | 27 void Push(const uint8_t* data, int size); |
| 29 | 28 |
| 30 // Get a pointer to the front of the queue and the queue size. | 29 // Get a pointer to the front of the queue and the queue size. |
| 31 // These values are only valid until the next Push() or | 30 // These values are only valid until the next Push() or |
| 32 // Pop() call. | 31 // Pop() call. |
| 33 void Peek(const uint8** data, int* size) const; | 32 void Peek(const uint8_t** data, int* size) const; |
| 34 | 33 |
| 35 // Remove |count| bytes from the front of the queue. | 34 // Remove |count| bytes from the front of the queue. |
| 36 void Pop(int count); | 35 void Pop(int count); |
| 37 | 36 |
| 38 private: | 37 private: |
| 39 // Returns a pointer to the front of the queue. | 38 // Returns a pointer to the front of the queue. |
| 40 uint8* front() const; | 39 uint8_t* front() const; |
| 41 | 40 |
| 42 scoped_ptr<uint8[]> buffer_; | 41 scoped_ptr<uint8_t[]> buffer_; |
| 43 | 42 |
| 44 // Size of |buffer_|. | 43 // Size of |buffer_|. |
| 45 size_t size_; | 44 size_t size_; |
| 46 | 45 |
| 47 // Offset from the start of |buffer_| that marks the front of the queue. | 46 // Offset from the start of |buffer_| that marks the front of the queue. |
| 48 size_t offset_; | 47 size_t offset_; |
| 49 | 48 |
| 50 // Number of bytes stored in the queue. | 49 // Number of bytes stored in the queue. |
| 51 int used_; | 50 int used_; |
| 52 | 51 |
| 53 DISALLOW_COPY_AND_ASSIGN(ByteQueue); | 52 DISALLOW_COPY_AND_ASSIGN(ByteQueue); |
| 54 }; | 53 }; |
| 55 | 54 |
| 56 } // namespace media | 55 } // namespace media |
| 57 | 56 |
| 58 #endif // MEDIA_BASE_BYTE_QUEUE_H_ | 57 #endif // MEDIA_BASE_BYTE_QUEUE_H_ |
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