Convert media constants to constexpr.

media/base/android/video_media_codec_decoder.cc

 // Copyright 2015 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.
 
 #include "media/base/android/video_media_codec_decoder.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 184 matching lines @@
   DVLOG(1) << class_name() << "::" << __FUNCTION__ << " pts:" << pts;
 
   start_time_ticks_ = base::TimeTicks::Now();
   start_pts_ = pts;
   last_seen_pts_ = pts;
 }
 
 void VideoMediaCodecDecoder::DissociatePTSFromTime() {
   DCHECK(media_task_runner_->BelongsToCurrentThread());
 
-  start_pts_ = last_seen_pts_ = kNoTimestamp();
+  start_pts_ = last_seen_pts_ = kNoTimestamp;
 }
 
 bool VideoMediaCodecDecoder::OnOutputFormatChanged() {
   DCHECK(decoder_thread_.task_runner()->BelongsToCurrentThread());
 
   gfx::Size prev_size = video_size_;
 
   // See b/18224769. The values reported from MediaCodecBridge::GetOutputSize
   // correspond to the actual video frame size, but this is not necessarily the
   // size that should be output.
@@ skipping 42 matching lines @@
       // We get here in the preroll phase. Render now as explained above.
       // |start_pts_| is not set yet, thus we cannot calculate |time_to_render|.
       ReleaseOutputBuffer(buffer_index, pts, (size > 0), update_time,
                           eos_encountered);
       return true;
     case kRenderNow:
       break;
   }
 
   DCHECK_EQ(kRenderNow, render_mode);
-  DCHECK_NE(kNoTimestamp(), start_pts_);  // start_pts_ must be set
+  DCHECK_NE(kNoTimestamp, start_pts_);  // start_pts_ must be set
 
   base::TimeDelta time_to_render =
       pts - (base::TimeTicks::Now() - start_time_ticks_ + start_pts_);
 
   DVLOG(2) << class_name() << "::" << __FUNCTION__ << " pts:" << pts
            << " ticks delta:" << (base::TimeTicks::Now() - start_time_ticks_)
            << " time_to_render:" << time_to_render;
 
   const bool render = (size > 0);
 
@@ skipping 71 matching lines @@
 
   // |update_current_time_cb_| might be null if there is audio stream.
   // Do not update current time for stand-alone EOS frames.
   if (!update_current_time_cb_.is_null() && update_time) {
     media_task_runner_->PostTask(
         FROM_HERE, base::Bind(update_current_time_cb_, pts, pts, false));
   }
 }
 
 }  // namespace media