[Video] Disable bg optimization if avg keyframe distance is >10s

media/filters/decoder_stream_traits.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_FILTERS_DECODER_STREAM_TRAITS_H_
 #define MEDIA_FILTERS_DECODER_STREAM_TRAITS_H_
 
 #include "base/time/time.h"
 #include "media/base/cdm_context.h"
 #include "media/base/demuxer_stream.h"
+#include "media/base/moving_average.h"
 #include "media/base/pipeline_status.h"
 #include "media/base/video_decoder_config.h"
 #include "media/filters/audio_timestamp_validator.h"
 
 namespace media {
 
 class AudioBuffer;
 class AudioDecoder;
 class CdmContext;
 class DecryptingAudioDecoder;
 class DecryptingVideoDecoder;
 class DemuxerStream;
 class VideoDecoder;
 class VideoFrame;
 
 template <DemuxerStream::Type StreamType>
 class DecoderStreamTraits {};
 
 template <>
 class MEDIA_EXPORT DecoderStreamTraits<DemuxerStream::AUDIO> {
  public:
   typedef AudioBuffer OutputType;
   typedef AudioDecoder DecoderType;
   typedef DecryptingAudioDecoder DecryptingDecoderType;
   typedef base::Callback<void(bool success)> InitCB;
   typedef base::Callback<void(const scoped_refptr<OutputType>&)> OutputCB;
 
   static std::string ToString();
   static bool NeedsBitstreamConversion(DecoderType* decoder);
-  static void ReportStatistics(const StatisticsCB& statistics_cb,
-                               int bytes_decoded);
   static scoped_refptr<OutputType> CreateEOSOutput();
 
   explicit DecoderStreamTraits(const scoped_refptr<MediaLog>& media_log);
 
+  void ReportStatistics(const StatisticsCB& statistics_cb, int bytes_decoded);
   void InitializeDecoder(DecoderType* decoder,
                          DemuxerStream* stream,
                          CdmContext* cdm_context,
                          const InitCB& init_cb,
                          const OutputCB& output_cb);
   void OnDecode(const scoped_refptr<DecoderBuffer>& buffer);
   void OnDecodeDone(const scoped_refptr<OutputType>& buffer);
   void OnStreamReset(DemuxerStream* stream);
 
  private:
   // Validates encoded timestamps match decoded output duration. MEDIA_LOG warns
   // if timestamp gaps are detected. Sufficiently large gaps can lead to AV sync
   // drift.
   std::unique_ptr<AudioTimestampValidator> audio_ts_validator_;
 
   scoped_refptr<MediaLog> media_log_;
 };
 
 template <>
 class MEDIA_EXPORT DecoderStreamTraits<DemuxerStream::VIDEO> {
  public:
   typedef VideoFrame OutputType;
   typedef VideoDecoder DecoderType;
   typedef DecryptingVideoDecoder DecryptingDecoderType;
   typedef base::Callback<void(bool success)> InitCB;
   typedef base::Callback<void(const scoped_refptr<OutputType>&)> OutputCB;
 
   static std::string ToString();
   static bool NeedsBitstreamConversion(DecoderType* decoder);
-  static void ReportStatistics(const StatisticsCB& statistics_cb,
-                               int bytes_decoded);
   static scoped_refptr<OutputType> CreateEOSOutput();
 
-  explicit DecoderStreamTraits(const scoped_refptr<MediaLog>& media_log) {}
+  explicit DecoderStreamTraits(const scoped_refptr<MediaLog>& media_log);
 
+  void ReportStatistics(const StatisticsCB& statistics_cb, int bytes_decoded);
   void InitializeDecoder(DecoderType* decoder,
                          DemuxerStream* stream,
                          CdmContext* cdm_context,
                          const InitCB& init_cb,
                          const OutputCB& output_cb);
   void OnDecode(const scoped_refptr<DecoderBuffer>& buffer);
   void OnDecodeDone(const scoped_refptr<OutputType>& buffer) {}
   void OnStreamReset(DemuxerStream* stream);
 
  private:
   base::TimeDelta last_keyframe_timestamp_;
+  MovingAverage keyframe_distance_average_;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_DECODER_STREAM_TRAITS_H_