Convert media constants to constexpr.

media/filters/source_buffer_range.h

 // Copyright 2014 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_SOURCE_BUFFER_RANGE_H_
 #define MEDIA_FILTERS_SOURCE_BUFFER_RANGE_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 160 matching lines @@
 
   // Returns true if the range knows the position of the next buffer it should
   // return, i.e. it has been Seek()ed. This does not necessarily mean that it
   // has the next buffer yet.
   bool HasNextBufferPosition() const;
 
   // Resets this range to an "unseeked" state.
   void ResetNextBufferPosition();
 
   // Returns the timestamp of the next buffer that will be returned from
-  // GetNextBuffer(), or kNoTimestamp() if the timestamp is unknown.
+  // GetNextBuffer(), or kNoTimestamp if the timestamp is unknown.
   DecodeTimestamp GetNextTimestamp() const;
 
   // Returns the start timestamp of the range.
   DecodeTimestamp GetStartTimestamp() const;
 
   // Returns the timestamp of the last buffer in the range.
   DecodeTimestamp GetEndTimestamp() const;
 
   // Returns the timestamp for the end of the buffered region in this range.
   // This is an approximation if the duration for the last buffer in the range
   // is unset.
   DecodeTimestamp GetBufferedEndTimestamp() const;
 
   // Gets the timestamp for the keyframe that is after |timestamp|. If
-  // there isn't a keyframe in the range after |timestamp| then kNoTimestamp()
+  // there isn't a keyframe in the range after |timestamp| then kNoTimestamp
   // is returned. If |timestamp| is in the "gap" between the value  returned by
   // GetStartTimestamp() and the timestamp on the first buffer in |buffers_|,
   // then |timestamp| is returned.
   DecodeTimestamp NextKeyframeTimestamp(DecodeTimestamp timestamp);
 
   // Gets the timestamp for the closest keyframe that is <= |timestamp|. If
   // there isn't a keyframe before |timestamp| or |timestamp| is outside
-  // this range, then kNoTimestamp() is returned.
+  // this range, then kNoTimestamp is returned.
   DecodeTimestamp KeyframeBeforeTimestamp(DecodeTimestamp timestamp);
 
   // Returns whether a buffer with a starting timestamp of |timestamp| would
   // belong in this range. This includes a buffer that would be appended to
   // the end of the range.
   bool BelongsToRange(DecodeTimestamp timestamp) const;
 
   // Returns true if the range has enough data to seek to the specified
   // |timestamp|, false otherwise.
   bool CanSeekTo(DecodeTimestamp timestamp) const;
@@ skipping 101 matching lines @@
 
   // Stores the amount of memory taken up by the data in |buffers_|.
   size_t size_in_bytes_;
 
   DISALLOW_COPY_AND_ASSIGN(SourceBufferRange);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_SOURCE_BUFFER_RANGE_H_