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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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82 // Removes buffers between |start| and |end| according to the steps | 82 // Removes buffers between |start| and |end| according to the steps |
83 // in the "Coded Frame Removal Algorithm" in the Media Source | 83 // in the "Coded Frame Removal Algorithm" in the Media Source |
84 // Extensions Spec. | 84 // Extensions Spec. |
85 // https://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-sourc
e.html#sourcebuffer-coded-frame-removal | 85 // https://dvcs.w3.org/hg/html-media/raw-file/default/media-source/media-sourc
e.html#sourcebuffer-coded-frame-removal |
86 // | 86 // |
87 // |duration| is the current duration of the presentation. It is | 87 // |duration| is the current duration of the presentation. It is |
88 // required by the computation outlined in the spec. | 88 // required by the computation outlined in the spec. |
89 void Remove(base::TimeDelta start, base::TimeDelta end, | 89 void Remove(base::TimeDelta start, base::TimeDelta end, |
90 base::TimeDelta duration); | 90 base::TimeDelta duration); |
91 | 91 |
| 92 void NotifyMediaTimeUpdate(DecodeTimestamp media_time); |
| 93 |
92 // Changes the SourceBufferStream's state so that it will start returning | 94 // Changes the SourceBufferStream's state so that it will start returning |
93 // buffers starting from the closest keyframe before |timestamp|. | 95 // buffers starting from the closest keyframe before |timestamp|. |
94 void Seek(base::TimeDelta timestamp); | 96 void Seek(base::TimeDelta timestamp); |
95 | 97 |
96 // Returns true if the SourceBufferStream has seeked to a time without | 98 // Returns true if the SourceBufferStream has seeked to a time without |
97 // buffered data and is waiting for more data to be appended. | 99 // buffered data and is waiting for more data to be appended. |
98 bool IsSeekPending() const; | 100 bool IsSeekPending() const; |
99 | 101 |
100 // Notifies the SourceBufferStream that the media duration has been changed to | 102 // Notifies the SourceBufferStream that the media duration has been changed to |
101 // |duration| so it should drop any data past that point. | 103 // |duration| so it should drop any data past that point. |
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358 bool end_of_stream_; | 360 bool end_of_stream_; |
359 | 361 |
360 // Timestamp of the last request to Seek(). | 362 // Timestamp of the last request to Seek(). |
361 base::TimeDelta seek_buffer_timestamp_; | 363 base::TimeDelta seek_buffer_timestamp_; |
362 | 364 |
363 // Pointer to the seeked-to Range. This is the range from which | 365 // Pointer to the seeked-to Range. This is the range from which |
364 // GetNextBuffer() calls are fulfilled after the |track_buffer_| has been | 366 // GetNextBuffer() calls are fulfilled after the |track_buffer_| has been |
365 // emptied. | 367 // emptied. |
366 SourceBufferRange* selected_range_; | 368 SourceBufferRange* selected_range_; |
367 | 369 |
| 370 // Current media time. |
| 371 // If not exact, the media time must be a lower bound of the media time. |
| 372 DecodeTimestamp current_media_time_; |
| 373 |
368 // Queue of the next buffers to be returned from calls to GetNextBuffer(). If | 374 // Queue of the next buffers to be returned from calls to GetNextBuffer(). If |
369 // |track_buffer_| is empty, return buffers from |selected_range_|. | 375 // |track_buffer_| is empty, return buffers from |selected_range_|. |
370 BufferQueue track_buffer_; | 376 BufferQueue track_buffer_; |
371 | 377 |
372 // The start time of the current media segment being appended. | 378 // The start time of the current media segment being appended. |
373 DecodeTimestamp media_segment_start_time_; | 379 DecodeTimestamp media_segment_start_time_; |
374 | 380 |
375 // Points to the range containing the current media segment being appended. | 381 // Points to the range containing the current media segment being appended. |
376 RangeList::iterator range_for_next_append_; | 382 RangeList::iterator range_for_next_append_; |
377 | 383 |
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414 | 420 |
415 // Indicates that splice frame generation is enabled. | 421 // Indicates that splice frame generation is enabled. |
416 const bool splice_frames_enabled_; | 422 const bool splice_frames_enabled_; |
417 | 423 |
418 DISALLOW_COPY_AND_ASSIGN(SourceBufferStream); | 424 DISALLOW_COPY_AND_ASSIGN(SourceBufferStream); |
419 }; | 425 }; |
420 | 426 |
421 } // namespace media | 427 } // namespace media |
422 | 428 |
423 #endif // MEDIA_FILTERS_SOURCE_BUFFER_STREAM_H_ | 429 #endif // MEDIA_FILTERS_SOURCE_BUFFER_STREAM_H_ |
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