Enhance AudioSplicer to crossfade marked splice frames.

media/filters/source_buffer_stream.cc

 // Copyright (c) 2012 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/source_buffer_stream.h"
 
 #include <algorithm>
 #include <map>
 
 #include "base/bind.h"
@@ skipping 1114 matching lines @@
   if (fade_out_preroll_index_ < fade_out_preroll.size()) {
     // Account for config changes which occur between fade out buffers.
     if (current_config_index_ !=
         fade_out_preroll[fade_out_preroll_index_]->GetConfigId()) {
       config_change_pending_ = true;
       DVLOG(1) << "Config change (fade out preroll config ID does not match).";
       return SourceBufferStream::kConfigChange;
     }
 
     *out_buffer = fade_out_preroll[fade_out_preroll_index_++];
+    (*out_buffer)->set_splice_preroll(true);
     return SourceBufferStream::kSuccess;
   }
 
   // Did we hand out the last fade out buffer on the last call?
   if (fade_out_preroll_index_ == fade_out_preroll.size()) {
     fade_out_preroll_index_++;
     config_change_pending_ = true;
     DVLOG(1) << "Config change (forced for fade in of splice frame).";
     return SourceBufferStream::kConfigChange;
   }
@@ skipping 933 matching lines @@
   return ComputeFudgeRoom(GetApproximateDuration());
 }
 
 base::TimeDelta SourceBufferRange::GetApproximateDuration() const {
   base::TimeDelta max_interbuffer_distance = interbuffer_distance_cb_.Run();
   DCHECK(max_interbuffer_distance != kNoTimestamp());
   return max_interbuffer_distance;
 }
 
 }  // namespace media