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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 // SourceBufferStream is a data structure that stores media Buffers in ranges. | 5 // SourceBufferStream is a data structure that stores media Buffers in ranges. |
6 // Buffers can be appended out of presentation order. Buffers are retrieved by | 6 // Buffers can be appended out of presentation order. Buffers are retrieved by |
7 // seeking to the desired start point and calling GetNextBuffer(). Buffers are | 7 // seeking to the desired start point and calling GetNextBuffer(). Buffers are |
8 // returned in sequential presentation order. | 8 // returned in sequential presentation order. |
9 | 9 |
10 #ifndef MEDIA_FILTERS_SOURCE_BUFFER_STREAM_H_ | 10 #ifndef MEDIA_FILTERS_SOURCE_BUFFER_STREAM_H_ |
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83 // Removes buffers between |start| and |end| according to the steps | 83 // Removes buffers between |start| and |end| according to the steps |
84 // in the "Coded Frame Removal Algorithm" in the Media Source | 84 // in the "Coded Frame Removal Algorithm" in the Media Source |
85 // Extensions Spec. | 85 // Extensions Spec. |
86 // https://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-sourc
e.html#sourcebuffer-coded-frame-removal | 86 // https://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-sourc
e.html#sourcebuffer-coded-frame-removal |
87 // | 87 // |
88 // |duration| is the current duration of the presentation. It is | 88 // |duration| is the current duration of the presentation. It is |
89 // required by the computation outlined in the spec. | 89 // required by the computation outlined in the spec. |
90 void Remove(base::TimeDelta start, base::TimeDelta end, | 90 void Remove(base::TimeDelta start, base::TimeDelta end, |
91 base::TimeDelta duration); | 91 base::TimeDelta duration); |
92 | 92 |
| 93 // Frees up space if the SourceBufferStream is taking up too much memory. |
| 94 // |media_time| is current playback position. |
| 95 bool GarbageCollectIfNeeded(DecodeTimestamp media_time); |
| 96 |
93 // Changes the SourceBufferStream's state so that it will start returning | 97 // Changes the SourceBufferStream's state so that it will start returning |
94 // buffers starting from the closest keyframe before |timestamp|. | 98 // buffers starting from the closest keyframe before |timestamp|. |
95 void Seek(base::TimeDelta timestamp); | 99 void Seek(base::TimeDelta timestamp); |
96 | 100 |
97 // Returns true if the SourceBufferStream has seeked to a time without | 101 // Returns true if the SourceBufferStream has seeked to a time without |
98 // buffered data and is waiting for more data to be appended. | 102 // buffered data and is waiting for more data to be appended. |
99 bool IsSeekPending() const; | 103 bool IsSeekPending() const; |
100 | 104 |
101 // Notifies the SourceBufferStream that the media duration has been changed to | 105 // Notifies the SourceBufferStream that the media duration has been changed to |
102 // |duration| so it should drop any data past that point. | 106 // |duration| so it should drop any data past that point. |
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143 // yet. | 147 // yet. |
144 base::TimeDelta GetMaxInterbufferDistance() const; | 148 base::TimeDelta GetMaxInterbufferDistance() const; |
145 | 149 |
146 void set_memory_limit(size_t memory_limit) { | 150 void set_memory_limit(size_t memory_limit) { |
147 memory_limit_ = memory_limit; | 151 memory_limit_ = memory_limit; |
148 } | 152 } |
149 | 153 |
150 private: | 154 private: |
151 friend class SourceBufferStreamTest; | 155 friend class SourceBufferStreamTest; |
152 | 156 |
153 // Frees up space if the SourceBufferStream is taking up too much memory. | |
154 void GarbageCollectIfNeeded(); | |
155 | |
156 // Attempts to delete approximately |total_bytes_to_free| amount of data | 157 // Attempts to delete approximately |total_bytes_to_free| amount of data |
157 // |ranges_|, starting at the front of |ranges_| and moving linearly forward | 158 // |ranges_|, starting at the front of |ranges_| and moving linearly forward |
158 // through the buffers. Deletes starting from the back if |reverse_direction| | 159 // through the buffers. Deletes starting from the back if |reverse_direction| |
159 // is true. Returns the number of bytes freed. | 160 // is true. |media_time| is current playback position. |
160 size_t FreeBuffers(size_t total_bytes_to_free, bool reverse_direction); | 161 // Returns the number of bytes freed. |
| 162 size_t FreeBuffers(size_t total_bytes_to_free, |
| 163 DecodeTimestamp media_time, |
| 164 bool reverse_direction); |
161 | 165 |
162 // Attempts to delete approximately |total_bytes_to_free| amount of data from | 166 // Attempts to delete approximately |total_bytes_to_free| amount of data from |
163 // |ranges_|, starting after the last appended buffer before the current | 167 // |ranges_|, starting after the last appended buffer before the current |
164 // playback position. | 168 // playback position |media_time|. |
165 size_t FreeBuffersAfterLastAppended(size_t total_bytes_to_free); | 169 size_t FreeBuffersAfterLastAppended(size_t total_bytes_to_free, |
| 170 DecodeTimestamp media_time); |
166 | 171 |
167 // Gets the removal range to secure |byte_to_free| from | 172 // Gets the removal range to secure |byte_to_free| from |
168 // [|start_timestamp|, |end_timestamp|). | 173 // [|start_timestamp|, |end_timestamp|). |
169 // Returns the size of buffers to secure if future | 174 // Returns the size of buffers to secure if future |
170 // Remove(|start_timestamp|, |removal_end_timestamp|, duration) is called. | 175 // Remove(|start_timestamp|, |removal_end_timestamp|, duration) is called. |
171 // Will not update |removal_end_timestamp| if the returned size is 0. | 176 // Will not update |removal_end_timestamp| if the returned size is 0. |
172 size_t GetRemovalRange(DecodeTimestamp start_timestamp, | 177 size_t GetRemovalRange(DecodeTimestamp start_timestamp, |
173 DecodeTimestamp end_timestamp, size_t byte_to_free, | 178 DecodeTimestamp end_timestamp, size_t byte_to_free, |
174 DecodeTimestamp* removal_end_timestamp); | 179 DecodeTimestamp* removal_end_timestamp); |
175 | 180 |
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424 // successes logged. | 429 // successes logged. |
425 int num_splice_generation_warning_logs_; | 430 int num_splice_generation_warning_logs_; |
426 int num_splice_generation_success_logs_; | 431 int num_splice_generation_success_logs_; |
427 | 432 |
428 DISALLOW_COPY_AND_ASSIGN(SourceBufferStream); | 433 DISALLOW_COPY_AND_ASSIGN(SourceBufferStream); |
429 }; | 434 }; |
430 | 435 |
431 } // namespace media | 436 } // namespace media |
432 | 437 |
433 #endif // MEDIA_FILTERS_SOURCE_BUFFER_STREAM_H_ | 438 #endif // MEDIA_FILTERS_SOURCE_BUFFER_STREAM_H_ |
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