Suppress slider thumb jumping around during seeking...

media/filters/ffmpeg_video_decoder.cc

 // Copyright (c) 2009 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/video_frame_impl.h"
 #include "media/filters/ffmpeg_common.h"
 #include "media/filters/ffmpeg_demuxer.h"
 #include "media/filters/ffmpeg_video_decoder.h"
 
 namespace {
@@ skipping 288 matching lines @@
   if (frame &&
       (frame->pts != static_cast<int64_t>(AV_NOPTS_VALUE)) &&
       (frame->pts != 0)) {
     pts.timestamp = ConvertTimestamp(time_base, frame->pts);
     repeat_pict = frame->repeat_pict;
   } else if (!pts_queue.empty()) {
     // If the frame did not have pts, try to get the pts from the
     // |pts_queue_|.
     pts.timestamp = pts_queue.top();
   } else {
+    DCHECK(last_pts.timestamp != StreamSample::kInvalidTimestamp);
+    DCHECK(last_pts.duration != StreamSample::kInvalidTimestamp);
     // Unable to read the pts from anywhere. Time to guess.
     pts.timestamp = last_pts.timestamp + last_pts.duration;
   }
 
   // Fill in the duration while accounting for repeated frames.
   //
   // TODO(ajwong): Make sure this formula is correct.
   pts.duration = ConvertTimestamp(time_base, 1 + repeat_pict);
 
   return pts;
@@ skipping 27 matching lines @@
 // static
 bool FFmpegVideoDecoder::PtsHeapOrdering::operator()(
     const base::TimeDelta& lhs,
     const base::TimeDelta& rhs) const {
   // std::priority_queue is a max-heap. We want lower timestamps to show up
   // first so reverse the natural less-than comparison.
   return rhs < lhs;
 }
 
 }  // namespace