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_DEFLICKERING_H_ 12 #define WEBRTC_MODULES_VIDEO_PROCESSING_DEFLICKERING_H_ 13 14 #include <string.h> // NULL 15 16 #include "webrtc/modules/video_processing/include/video_processing.h" 17 #include "webrtc/typedefs.h" 18 19 namespace webrtc { 20 21 class VPMDeflickering { 22 public: 23 VPMDeflickering(); 24 ~VPMDeflickering(); 25 26 void Reset(); 27 int32_t ProcessFrame(VideoFrame* frame, VideoProcessing::FrameStats* stats); 28 29 private: 30 int32_t PreDetection(uint32_t timestamp, 31 const VideoProcessing::FrameStats& stats); 32 33 int32_t DetectFlicker(); 34 35 enum { kMeanBufferLength = 32 }; 36 enum { kFrameHistory_size = 15 }; 37 enum { kNumProbs = 12 }; 38 enum { kNumQuants = kNumProbs + 2 }; 39 enum { kMaxOnlyLength = 5 }; 40 41 uint32_t mean_buffer_length_; 42 uint8_t detection_state_; // 0: No flickering 43 // 1: Flickering detected 44 // 2: In flickering 45 int32_t mean_buffer_[kMeanBufferLength]; 46 uint32_t timestamp_buffer_[kMeanBufferLength]; 47 uint32_t frame_rate_; 48 static const uint16_t prob_uw16_[kNumProbs]; 49 static const uint16_t weight_uw16_[kNumQuants - kMaxOnlyLength]; 50 uint8_t quant_hist_uw8_[kFrameHistory_size][kNumQuants]; 51 }; 52 53 } // namespace webrtc 54 55 #endif // WEBRTC_MODULES_VIDEO_PROCESSING_DEFLICKERING_H_ 56
