Adds WebMClusterParserTest coverage for duration default/estimation/fallback logic

media/formats/webm/webm_cluster_parser.h

 // 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.
 
 #ifndef MEDIA_FORMATS_WEBM_WEBM_CLUSTER_PARSER_H_
 #define MEDIA_FORMATS_WEBM_WEBM_CLUSTER_PARSER_H_
 
 #include <deque>
 #include <map>
 #include <set>
 #include <string>
 
 #include "base/memory/scoped_ptr.h"
 #include "media/base/media_export.h"
 #include "media/base/media_log.h"
 #include "media/base/stream_parser.h"
 #include "media/base/stream_parser_buffer.h"
 #include "media/formats/webm/webm_parser.h"
 #include "media/formats/webm/webm_tracks_parser.h"
 
 namespace media {
 
 class MEDIA_EXPORT WebMClusterParser : public WebMParserClient {
  public:
   typedef StreamParser::TrackId TrackId;
 
+  // Arbitrarily-chosen numbers to estimate the duration of a buffer if none is
+  // set and there is not enough information to get a better estimate.
+  // TODO(wolenetz/acolwell): Parse audio codebook to determine missing audio
+  // frame durations. See http://crbug.com/351166.
+  enum {
+    kDefaultAudioBufferDurationInMs = 23,  // Common 1k samples @44.1kHz
+    kDefaultVideoBufferDurationInMs = 42  // Low 24fps to reduce stalls
+  };
+
  private:
   // Helper class that manages per-track state.
   class Track {
    public:
     Track(int track_num, bool is_video, base::TimeDelta default_duration);
     ~Track();
 
     int track_num() const { return track_num_; }
     const std::deque<scoped_refptr<StreamParserBuffer> >& buffers() const {
       return buffers_;
@@ skipping 156 matching lines @@
   TextBufferQueueMap text_buffers_map_;
 
   LogCB log_cb_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(WebMClusterParser);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FORMATS_WEBM_WEBM_CLUSTER_PARSER_H_