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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 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 // SeekableBuffer to support backward and forward seeking in a buffer for | 5 // SeekableBuffer to support backward and forward seeking in a buffer for |
6 // reading a media data source. | 6 // reading a media data source. |
7 // | 7 // |
8 // In order to support backward and forward seeking, this class buffers data in | 8 // In order to support backward and forward seeking, this class buffers data in |
9 // both backward and forward directions, the current read position can be reset | 9 // both backward and forward directions, the current read position can be reset |
10 // to anywhere in the buffered data. | 10 // to anywhere in the buffered data. |
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96 | 96 |
97 // Returns the number of bytes buffered that precedes the current read | 97 // Returns the number of bytes buffered that precedes the current read |
98 // position. | 98 // position. |
99 size_t backward_bytes() const { return backward_bytes_; } | 99 size_t backward_bytes() const { return backward_bytes_; } |
100 | 100 |
101 // Sets the forward_capacity to |new_forward_capacity| bytes. | 101 // Sets the forward_capacity to |new_forward_capacity| bytes. |
102 void set_forward_capacity(size_t new_forward_capacity) { | 102 void set_forward_capacity(size_t new_forward_capacity) { |
103 forward_capacity_ = new_forward_capacity; | 103 forward_capacity_ = new_forward_capacity; |
104 } | 104 } |
105 | 105 |
| 106 // Sets the backward_capacity to |new_backward_capacity| bytes. |
| 107 void set_backward_capacity(size_t new_backward_capacity) { |
| 108 backward_capacity_ = new_backward_capacity; |
| 109 } |
| 110 |
106 // Returns the maximum number of bytes that should be kept in the forward | 111 // Returns the maximum number of bytes that should be kept in the forward |
107 // direction. | 112 // direction. |
108 size_t forward_capacity() const { return forward_capacity_; } | 113 size_t forward_capacity() const { return forward_capacity_; } |
109 | 114 |
110 // Returns the maximum number of bytes that should be kept in the backward | 115 // Returns the maximum number of bytes that should be kept in the backward |
111 // direction. | 116 // direction. |
112 size_t backward_capacity() const { return backward_capacity_; } | 117 size_t backward_capacity() const { return backward_capacity_; } |
113 | 118 |
114 // Returns the current timestamp, taking into account current offset. The | 119 // Returns the current timestamp, taking into account current offset. The |
115 // value calculated based on the timestamp of the current buffer. If | 120 // value calculated based on the timestamp of the current buffer. If |
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165 // Keeps track of the most recent time we've seen in case the |buffers_| is | 170 // Keeps track of the most recent time we've seen in case the |buffers_| is |
166 // empty when our owner asks what time it is. | 171 // empty when our owner asks what time it is. |
167 base::TimeDelta current_time_; | 172 base::TimeDelta current_time_; |
168 | 173 |
169 DISALLOW_COPY_AND_ASSIGN(SeekableBuffer); | 174 DISALLOW_COPY_AND_ASSIGN(SeekableBuffer); |
170 }; | 175 }; |
171 | 176 |
172 } // namespace media | 177 } // namespace media |
173 | 178 |
174 #endif // MEDIA_BASE_SEEKABLE_BUFFER_H_ | 179 #endif // MEDIA_BASE_SEEKABLE_BUFFER_H_ |
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