text: /*
   *  Copyright (c) 2011 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_PROCESSING_MAIN_SOURCE_VIDEO_DECIMATOR_H
  #define WEBRTC_MODULES_VIDEO_PROCESSING_MAIN_SOURCE_VIDEO_DECIMATOR_H
  
  #include "webrtc/modules/interface/module_common_types.h"
  #include "webrtc/typedefs.h"
  
  namespace webrtc {
  
  class VPMVideoDecimator {
   public:
    VPMVideoDecimator();
    ~VPMVideoDecimator();
  
    void Reset();
  
    void EnableTemporalDecimation(bool enable);
  
    int32_t SetMaxFramerate(uint32_t max_frame_rate);
    int32_t SetTargetframe_rate(uint32_t frame_rate);
  
    bool DropFrame();
  
    void UpdateIncomingframe_rate();
  
    // Get Decimated Frame Rate/Dimensions.
    uint32_t Decimatedframe_rate();
  
    // Get input frame rate.
    uint32_t Inputframe_rate();
  
   private:
    void ProcessIncomingframe_rate(int64_t now);
  
    enum { kFrameCountHistory_size = 90};
    enum { kFrameHistoryWindowMs = 2000};
  
    // Temporal decimation.
    int32_t overshoot_modifier_;
    uint32_t drop_count_;
    uint32_t keep_count_;
    uint32_t target_frame_rate_;
    float incoming_frame_rate_;
    uint32_t max_frame_rate_;
    int64_t incoming_frame_times_[kFrameCountHistory_size];
    bool enable_temporal_decimation_;
  };
  
  }  // namespace webrtc
  
  #endif  // WEBRTC_MODULES_VIDEO_PROCESSING_MAIN_SOURCE_VIDEO_DECIMATOR_H
  