text: /*
   *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
   *
   *  Use of this source code is governed by a BSD-style license
   *  that can be found in the LICENSE file in the root of the source
   *  tree. An additional intellectual property rights grant can be found
   *  in the file PATENTS.  All contributing project authors may
   *  be found in the AUTHORS file in the root of the source tree.
   */
  
  #ifndef WEBRTC_MODULES_VIDEO_CODING_CONTENT_METRICS_PROCESSING_H_
  #define WEBRTC_MODULES_VIDEO_CODING_CONTENT_METRICS_PROCESSING_H_
  
  #include "webrtc/typedefs.h"
  
  namespace webrtc {
  
  struct VideoContentMetrics;
  
  // QM interval time (in ms)
  enum {
    kQmMinIntervalMs = 10000
  };
  
  // Flag for NFD metric vs motion metric
  enum {
    kNfdMetric = 1
  };
  
  /**********************************/
  /* Content Metrics Processing     */
  /**********************************/
  class VCMContentMetricsProcessing {
   public:
    VCMContentMetricsProcessing();
    ~VCMContentMetricsProcessing();
  
    // Update class with latest metrics.
    int UpdateContentData(const VideoContentMetrics *contentMetrics);
  
    // Reset the short-term averaged content data.
    void ResetShortTermAvgData();
  
    // Initialize.
    int Reset();
  
    // Inform class of current frame rate.
    void UpdateFrameRate(uint32_t frameRate);
  
    // Returns the long-term averaged content data: recursive average over longer
    // time scale.
    VideoContentMetrics* LongTermAvgData();
  
    // Returns the short-term averaged content data: uniform average over
    // shorter time scalE.
    VideoContentMetrics* ShortTermAvgData();
  
   private:
    // Compute working average.
    int ProcessContent(const VideoContentMetrics *contentMetrics);
  
    // Update the recursive averaged metrics: longer time average (~5/10 secs).
    void UpdateRecursiveAvg(const VideoContentMetrics *contentMetrics);
  
    // Update the uniform averaged metrics: shorter time average (~RTCP report).
    void UpdateUniformAvg(const VideoContentMetrics *contentMetrics);
  
    VideoContentMetrics* recursive_avg_;
    VideoContentMetrics* uniform_avg_;
    float recursive_avg_factor_;
    uint32_t frame_cnt_uniform_avg_;
    float avg_motion_level_;
    float avg_spatial_level_;
  };
  }  // namespace webrtc
  #endif  // WEBRTC_MODULES_VIDEO_CODING_CONTENT_METRICS_PROCESSING_H_
  