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| 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_CODING_UTILITY_INCLUDE_FRAME_DROPPER_H_ | |
| 12 #define WEBRTC_MODULES_VIDEO_CODING_UTILITY_INCLUDE_FRAME_DROPPER_H_ | |
| 13 | |
| 14 #include <cstddef> | |
| 15 | |
| 16 #include "webrtc/base/exp_filter.h" | |
| 17 #include "webrtc/typedefs.h" | |
| 18 | |
| 19 namespace webrtc | |
| 20 { | |
| 21 | |
| 22 // The Frame Dropper implements a variant of the leaky bucket algorithm | |
| 23 // for keeping track of when to drop frames to avoid bit rate | |
| 24 // over use when the encoder can't keep its bit rate. | |
| 25 class FrameDropper | |
| 26 { | |
| 27 public: | |
| 28 FrameDropper(); | |
| 29 explicit FrameDropper(float max_time_drops); | |
| 30 virtual ~FrameDropper() {} | |
| 31 | |
| 32 // Resets the FrameDropper to its initial state. | |
| 33 // This means that the frameRateWeight is set to its | |
| 34 // default value as well. | |
| 35 virtual void Reset(); | |
| 36 | |
| 37 virtual void Enable(bool enable); | |
| 38 // Answers the question if it's time to drop a frame | |
| 39 // if we want to reach a given frame rate. Must be | |
| 40 // called for every frame. | |
| 41 // | |
| 42 // Return value : True if we should drop the current frame | |
| 43 virtual bool DropFrame(); | |
| 44 // Updates the FrameDropper with the size of the latest encoded | |
| 45 // frame. The FrameDropper calculates a new drop ratio (can be | |
| 46 // seen as the probability to drop a frame) and updates its | |
| 47 // internal statistics. | |
| 48 // | |
| 49 // Input: | |
| 50 // - frameSizeBytes : The size of the latest frame | |
| 51 // returned from the encoder. | |
| 52 // - deltaFrame : True if the encoder returned | |
| 53 // a key frame. | |
| 54 virtual void Fill(size_t frameSizeBytes, bool deltaFrame); | |
| 55 | |
| 56 virtual void Leak(uint32_t inputFrameRate); | |
| 57 | |
| 58 void UpdateNack(uint32_t nackBytes); | |
| 59 | |
| 60 // Sets the target bit rate and the frame rate produced by | |
| 61 // the camera. | |
| 62 // | |
| 63 // Input: | |
| 64 // - bitRate : The target bit rate | |
| 65 virtual void SetRates(float bitRate, float incoming_frame_rate); | |
| 66 | |
| 67 // Return value : The current average frame rate produced | |
| 68 // if the DropFrame() function is used as | |
| 69 // instruction of when to drop frames. | |
| 70 virtual float ActualFrameRate(uint32_t inputFrameRate) const; | |
| 71 | |
| 72 private: | |
| 73 void FillBucket(float inKbits, float outKbits); | |
| 74 void UpdateRatio(); | |
| 75 void CapAccumulator(); | |
| 76 | |
| 77 rtc::ExpFilter _keyFrameSizeAvgKbits; | |
| 78 rtc::ExpFilter _keyFrameRatio; | |
| 79 float _keyFrameSpreadFrames; | |
| 80 int32_t _keyFrameCount; | |
| 81 float _accumulator; | |
| 82 float _accumulatorMax; | |
| 83 float _targetBitRate; | |
| 84 bool _dropNext; | |
| 85 rtc::ExpFilter _dropRatio; | |
| 86 int32_t _dropCount; | |
| 87 float _windowSize; | |
| 88 float _incoming_frame_rate; | |
| 89 bool _wasBelowMax; | |
| 90 bool _enabled; | |
| 91 bool _fastMode; | |
| 92 float _cap_buffer_size; | |
| 93 float _max_time_drops; | |
| 94 }; // end of VCMFrameDropper class | |
| 95 | |
| 96 } // namespace webrtc | |
| 97 | |
| 98 #endif // WEBRTC_MODULES_VIDEO_CODING_UTILITY_INCLUDE_FRAME_DROPPER_H_ | |
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Chromium Code Reviews
Issue 1440873005:
modules/video_coding/utility: Remove include (Closed)
Base URL: https://chromium.googlesource.com/external/webrtc.git@master