1 /*
2  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
3  *
4  *  Use of this source code is governed by a BSD-style license
5  *  that can be found in the LICENSE file in the root of the source
6  *  tree. An additional intellectual property rights grant can be found
7  *  in the file PATENTS.  All contributing project authors may
8  *  be found in the AUTHORS file in the root of the source tree.
9  */
10 
11 #ifndef WEBRTC_MODULES_VIDEO_PROCESSING_VIDEO_DECIMATOR_H_
12 #define WEBRTC_MODULES_VIDEO_PROCESSING_VIDEO_DECIMATOR_H_
13 
14 #include "webrtc/modules/include/module_common_types.h"
15 #include "webrtc/typedefs.h"
16 
17 namespace webrtc {
18 
19 class VPMVideoDecimator {
20  public:
21   VPMVideoDecimator();
22   ~VPMVideoDecimator();
23 
24   void Reset();
25 
26   void EnableTemporalDecimation(bool enable);
27 
28   void SetTargetFramerate(int frame_rate);
29 
30   bool DropFrame();
31 
32   void UpdateIncomingframe_rate();
33 
34   // Get Decimated Frame Rate/Dimensions.
35   uint32_t GetDecimatedFrameRate();
36 
37   // Get input frame rate.
38   uint32_t Inputframe_rate();
39 
40  private:
41   void ProcessIncomingframe_rate(int64_t now);
42 
43   enum { kFrameCountHistory_size = 90 };
44   enum { kFrameHistoryWindowMs = 2000 };
45 
46   // Temporal decimation.
47   int32_t overshoot_modifier_;
48   uint32_t drop_count_;
49   uint32_t keep_count_;
50   uint32_t target_frame_rate_;
51   float incoming_frame_rate_;
52   int64_t incoming_frame_times_[kFrameCountHistory_size];
53   bool enable_temporal_decimation_;
54 };
55 
56 }  // namespace webrtc
57 
58 #endif  // WEBRTC_MODULES_VIDEO_PROCESSING_VIDEO_DECIMATOR_H_
59