Remove lingering frames of old data when appending a new segment

media/filters/source_buffer_stream.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // SourceBufferStream is a data structure that stores media Buffers in ranges.
 // Buffers can be appended out of presentation order. Buffers are retrieved by
 // seeking to the desired start point and calling GetNextBuffer(). Buffers are
 // returned in sequential presentation order.
 
 #ifndef MEDIA_FILTERS_SOURCE_BUFFER_STREAM_H_
@@ skipping 137 matching lines @@
   // UpdateTrackBuffer() takes these |deleted_buffers| and decides whether it
   // wants to save any buffers into |track_buffer_|.
   // TODO(vrk): This is a little crazy! Ideas for cleanup in crbug.com/129623.
   void UpdateTrackBuffer(const BufferQueue& deleted_buffers);
 
   // Checks to see if |range_with_new_buffers_itr| can be merged with the range
   // next to it, and merges them if so.
   void MergeWithAdjacentRangeIfNecessary(
       const RangeList::iterator& range_with_new_buffers_itr);
 
+  // Deletes the buffers between |start_timestamp|, |end_timestamp| from
+  // |range|. Deletes between [start,end] if |is_range_exclusive| is true, or
+  // (start,end) if |is_range_exclusive| is false.
+  // Buffers are deleted in GOPs, so this method may delete buffers past
+  // |end_timestamp| if the keyframe a buffer depends on was deleted.
+  // Returns true if the |next_buffer_index_| is reset, and places the buffers
+  // removed from the range starting at |next_buffer_index_| in
+  // |deleted_buffers|.
+  bool DeleteBetween(SourceBufferRange* range,
+                     base::TimeDelta start_timestamp,
+                     base::TimeDelta end_timestamp,
+                     bool is_range_exclusive,
+                     BufferQueue* deleted_buffers);
+
+  // Returns true if |second_timestamp| is the timestamp of the next buffer in
+  // sequence after |first_timestamp|, false otherwise.
+  bool AreAdjacentInSequence(
+      base::TimeDelta first_timestamp, base::TimeDelta second_timestamp) const;
+
   // Helper method that returns the timestamp for the next buffer that
   // |selected_range_| will return from GetNextBuffer() call, or kNoTimestamp()
   // if in between seeking (i.e. |selected_range_| is null).
   base::TimeDelta GetNextBufferTimestamp();
 
   // Returns the timestamp of the last buffer in the |selected_range_| or
   // kNoTimestamp() if |selected_range_| is null.
   base::TimeDelta GetEndBufferTimestamp();
 
   // Finds the range that should contain a media segment that begins with
@@ skipping 99 matching lines @@
   // config. GetNextBuffer() must not be called again until
   // GetCurrentXXXDecoderConfig() has been called.
   bool config_change_pending_;
 
   DISALLOW_COPY_AND_ASSIGN(SourceBufferStream);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_SOURCE_BUFFER_STREAM_H_