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1 /* | 1 /* |
2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. | 2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 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 | 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 | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 | 10 |
11 #ifndef WEBRTC_MODULES_VIDEO_CODING_UTILITY_INCLUDE_FRAME_DROPPER_H_ | 11 #ifndef WEBRTC_MODULES_VIDEO_CODING_UTILITY_FRAME_DROPPER_H_ |
12 #define WEBRTC_MODULES_VIDEO_CODING_UTILITY_INCLUDE_FRAME_DROPPER_H_ | 12 #define WEBRTC_MODULES_VIDEO_CODING_UTILITY_FRAME_DROPPER_H_ |
13 | 13 |
14 #include <cstddef> | 14 #include <cstddef> |
15 | 15 |
16 #include "webrtc/base/exp_filter.h" | 16 #include "webrtc/base/exp_filter.h" |
17 #include "webrtc/typedefs.h" | 17 #include "webrtc/typedefs.h" |
18 | 18 |
19 namespace webrtc | 19 namespace webrtc { |
20 { | |
21 | 20 |
22 // The Frame Dropper implements a variant of the leaky bucket algorithm | 21 // The Frame Dropper implements a variant of the leaky bucket algorithm |
23 // for keeping track of when to drop frames to avoid bit rate | 22 // for keeping track of when to drop frames to avoid bit rate |
24 // over use when the encoder can't keep its bit rate. | 23 // over use when the encoder can't keep its bit rate. |
25 class FrameDropper | 24 class FrameDropper { |
26 { | 25 public: |
27 public: | |
28 FrameDropper(); | 26 FrameDropper(); |
29 explicit FrameDropper(float max_time_drops); | 27 explicit FrameDropper(float max_time_drops); |
30 virtual ~FrameDropper() {} | 28 virtual ~FrameDropper() {} |
31 | 29 |
32 // Resets the FrameDropper to its initial state. | 30 // Resets the FrameDropper to its initial state. |
33 // This means that the frameRateWeight is set to its | 31 // This means that the frameRateWeight is set to its |
34 // default value as well. | 32 // default value as well. |
35 virtual void Reset(); | 33 virtual void Reset(); |
36 | 34 |
37 virtual void Enable(bool enable); | 35 virtual void Enable(bool enable); |
(...skipping 24 matching lines...) Expand all Loading... |
62 // | 60 // |
63 // Input: | 61 // Input: |
64 // - bitRate : The target bit rate | 62 // - bitRate : The target bit rate |
65 virtual void SetRates(float bitRate, float incoming_frame_rate); | 63 virtual void SetRates(float bitRate, float incoming_frame_rate); |
66 | 64 |
67 // Return value : The current average frame rate produced | 65 // Return value : The current average frame rate produced |
68 // if the DropFrame() function is used as | 66 // if the DropFrame() function is used as |
69 // instruction of when to drop frames. | 67 // instruction of when to drop frames. |
70 virtual float ActualFrameRate(uint32_t inputFrameRate) const; | 68 virtual float ActualFrameRate(uint32_t inputFrameRate) const; |
71 | 69 |
72 private: | 70 private: |
73 void FillBucket(float inKbits, float outKbits); | 71 void FillBucket(float inKbits, float outKbits); |
74 void UpdateRatio(); | 72 void UpdateRatio(); |
75 void CapAccumulator(); | 73 void CapAccumulator(); |
76 | 74 |
77 rtc::ExpFilter _keyFrameSizeAvgKbits; | 75 rtc::ExpFilter _keyFrameSizeAvgKbits; |
78 rtc::ExpFilter _keyFrameRatio; | 76 rtc::ExpFilter _keyFrameRatio; |
79 float _keyFrameSpreadFrames; | 77 float _keyFrameSpreadFrames; |
80 int32_t _keyFrameCount; | 78 int32_t _keyFrameCount; |
81 float _accumulator; | 79 float _accumulator; |
82 float _accumulatorMax; | 80 float _accumulatorMax; |
83 float _targetBitRate; | 81 float _targetBitRate; |
84 bool _dropNext; | 82 bool _dropNext; |
85 rtc::ExpFilter _dropRatio; | 83 rtc::ExpFilter _dropRatio; |
86 int32_t _dropCount; | 84 int32_t _dropCount; |
87 float _windowSize; | 85 float _windowSize; |
88 float _incoming_frame_rate; | 86 float _incoming_frame_rate; |
89 bool _wasBelowMax; | 87 bool _wasBelowMax; |
90 bool _enabled; | 88 bool _enabled; |
91 bool _fastMode; | 89 bool _fastMode; |
92 float _cap_buffer_size; | 90 float _cap_buffer_size; |
93 float _max_time_drops; | 91 float _max_time_drops; |
94 }; // end of VCMFrameDropper class | 92 }; // end of VCMFrameDropper class |
95 | 93 |
96 } // namespace webrtc | 94 } // namespace webrtc |
97 | 95 |
98 #endif // WEBRTC_MODULES_VIDEO_CODING_UTILITY_INCLUDE_FRAME_DROPPER_H_ | 96 #endif // WEBRTC_MODULES_VIDEO_CODING_UTILITY_FRAME_DROPPER_H_ |
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