MSE: Don't force discontinuity logic on audio frame partial front trimming

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 <cstdlib>
 
 #include "base/stl_util.h"
 #include "media/base/buffers.h"
@@ skipping 580 matching lines @@
     //      |append_window_start| and does not end after |append_window_end|.
     // 11. If frame end timestamp is greater than appendWindowEnd, then set the
     //     need random access point flag to true, drop the coded frame, and jump
     //     to the top of the loop to start processing the next coded frame.
     frame->set_timestamp(presentation_timestamp);
     frame->SetDecodeTimestamp(decode_timestamp);
     if (track_buffer->stream()->supports_partial_append_window_trimming() &&
         HandlePartialAppendWindowTrimming(append_window_start,
                                           append_window_end,
                                           frame)) {
-      // If |frame| was front-trimmed a discontinuity may exist, so treat the
-      // next frames appended as if they were the beginning of a new media
-      // segment.
-      if (frame->timestamp() != presentation_timestamp && !sequence_mode_)
-        *new_media_segment = true;
-
       // |frame| has been partially trimmed or had preroll added.  Though
       // |frame|'s duration may have changed, do not update |frame_duration|
       // here, so |track_buffer|'s last frame duration update uses original
       // frame duration and reduces spurious discontinuity detection.
       decode_timestamp = frame->GetDecodeTimestamp();
       presentation_timestamp = frame->timestamp();
       frame_end_timestamp = frame->timestamp() + frame->duration();
     }
 
     if (presentation_timestamp < append_window_start ||
@@ skipping 84 matching lines @@
     DCHECK(group_end_timestamp_ >= base::TimeDelta());
 
     return true;
   }
 
   NOTREACHED();
   return false;
 }
 
 }  // namespace media