webrtc/modules/video_coding/main/source/content_metrics_processing.h

/*
 *  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_