Revert of MSE: Relax the 'media segment must begin with keyframe' requirement

media/filters/media_source_state.h

 // Copyright (c) 2016 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.
 
 #ifndef MEDIA_FILTERS_MEDIA_SOURCE_STATE_H_
 #define MEDIA_FILTERS_MEDIA_SOURCE_STATE_H_
 
 #include <list>
 
 #include "base/bind.h"
@@ skipping 153 matching lines @@
   // so Append()'s caller can know the new offset. This pointer is only non-NULL
   // during the lifetime of an Append() call.
   TimeDelta* timestamp_offset_during_append_;
 
   // During Append(), coded frame processing triggered by OnNewBuffers()
   // requires these two attributes. These are only valid during the lifetime of
   // an Append() call.
   TimeDelta append_window_start_during_append_;
   TimeDelta append_window_end_during_append_;
 
+  // Set to true if the next buffers appended within the append window
+  // represent the start of a new media segment. This flag being set
+  // triggers a call to |new_segment_cb_| when the new buffers are
+  // appended. The flag is set on actual media segment boundaries and
+  // when the "append window" filtering causes discontinuities in the
+  // appended data.
+  // TODO(wolenetz/acolwell): Investigate if we need this, or if coded frame
+  // processing's discontinuity logic is enough. See http://crbug.com/351489.
+  bool new_media_segment_;
+
   // Keeps track of whether a media segment is being parsed.
   bool parsing_media_segment_;
 
   // Valid only while |parsing_media_segment_| is true. These flags enable
   // warning when at least one frame for each A/V track is not in a parsed media
   // segment.
   bool media_segment_contained_audio_frame_;
   bool media_segment_contained_video_frame_;
 
   // The object used to parse appended data.
@@ skipping 21 matching lines @@
   // TODO(wolenetz): Refactor this function while integrating April 29, 2014
   // changes to MSE spec. See http://crbug.com/371499.
   bool auto_update_timestamp_offset_;
 
   DISALLOW_COPY_AND_ASSIGN(MediaSourceState);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_MEDIA_SOURCE_STATE_H_