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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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