MSE: Allow negative parsed frame PTS/DTS in FrameProcessor

media/filters/frame_processor.cc

 // 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.
 
 #include "media/filters/frame_processor.h"
 
 #include "base/stl_util.h"
 #include "media/base/buffers.h"
 #include "media/base/stream_parser_buffer.h"
 
@@ skipping 89 matching lines @@
     base::TimeDelta frame_duration = frame->duration();
 
     DVLOG(3) << __FUNCTION__ << ": Processing frame "
              << "Type=" << frame->type()
              << ", TrackID=" << frame->track_id()
              << ", PTS=" << presentation_timestamp.InSecondsF()
              << ", DTS=" << decode_timestamp.InSecondsF()
              << ", DUR=" << frame_duration.InSecondsF();
 
     // Sanity check the timestamps.
-    if (presentation_timestamp < base::TimeDelta()) {
-      DVLOG(2) << __FUNCTION__ << ": Negative or unknown frame PTS: "
-               << presentation_timestamp.InSecondsF();
+    if (presentation_timestamp == kNoTimestamp()) {
+      DVLOG(2) << __FUNCTION__ << ": Unknown frame PTS";
       return false;
     }
-    if (decode_timestamp < base::TimeDelta()) {
-      DVLOG(2) << __FUNCTION__ << ": Negative or unknown frame DTS: "
-               << decode_timestamp.InSecondsF();
+    if (decode_timestamp == kNoTimestamp()) {
+      DVLOG(2) << __FUNCTION__ << ": Unknown frame DTS";
       return false;
     }
     if (decode_timestamp > presentation_timestamp) {
       // TODO(wolenetz): Determine whether DTS>PTS should really be allowed. See
       // http://crbug.com/354518.
       DVLOG(2) << __FUNCTION__ << ": WARNING: Frame DTS("
                << decode_timestamp.InSecondsF() << ") > PTS("
                << presentation_timestamp.InSecondsF() << ")";
     }
 
@@ skipping 236 matching lines @@
     DCHECK(group_end_timestamp_ >= base::TimeDelta());
 
     return true;
   }
 
   NOTREACHED();
   return false;
 }
 
 }  // namespace media