Delete unused methods of the VideoProcessing class. And fix a typo.

webrtc/modules/video_processing/brightness_detection.cc

-/*
- *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#include "webrtc/modules/video_processing/brightness_detection.h"
-
-#include <math.h>
-
-#include "webrtc/modules/video_processing/include/video_processing.h"
-
-namespace webrtc {
-
-VPMBrightnessDetection::VPMBrightnessDetection() {
-  Reset();
-}
-
-VPMBrightnessDetection::~VPMBrightnessDetection() {}
-
-void VPMBrightnessDetection::Reset() {
-  frame_cnt_bright_ = 0;
-  frame_cnt_dark_ = 0;
-}
-
-int32_t VPMBrightnessDetection::ProcessFrame(
-    const VideoFrame& frame,
-    const VideoProcessing::FrameStats& stats) {
-  if (frame.IsZeroSize()) {
-    return VPM_PARAMETER_ERROR;
-  }
-  int width = frame.width();
-  int height = frame.height();
-
-  if (!VideoProcessing::ValidFrameStats(stats)) {
-    return VPM_PARAMETER_ERROR;
-  }
-
-  const uint8_t frame_cnt_alarm = 2;
-
-  // Get proportion in lowest bins.
-  uint8_t low_th = 20;
-  float prop_low = 0;
-  for (uint32_t i = 0; i < low_th; i++) {
-    prop_low += stats.hist[i];
-  }
-  prop_low /= stats.num_pixels;
-
-  // Get proportion in highest bins.
-  unsigned char high_th = 230;
-  float prop_high = 0;
-  for (uint32_t i = high_th; i < 256; i++) {
-    prop_high += stats.hist[i];
-  }
-  prop_high /= stats.num_pixels;
-
-  if (prop_high < 0.4) {
-    if (stats.mean < 90 || stats.mean > 170) {
-      // Standard deviation of Y
-      const uint8_t* buffer = frame.buffer(kYPlane);
-      float std_y = 0;
-      for (int h = 0; h < height; h += (1 << stats.sub_sampling_factor)) {
-        int row = h * width;
-        for (int w = 0; w < width; w += (1 << stats.sub_sampling_factor)) {
-          std_y +=
-              (buffer[w + row] - stats.mean) * (buffer[w + row] - stats.mean);
-        }
-      }
-      std_y = sqrt(std_y / stats.num_pixels);
-
-      // Get percentiles.
-      uint32_t sum = 0;
-      uint32_t median_y = 140;
-      uint32_t perc05 = 0;
-      uint32_t perc95 = 255;
-      float pos_perc05 = stats.num_pixels * 0.05f;
-      float pos_median = stats.num_pixels * 0.5f;
-      float posPerc95 = stats.num_pixels * 0.95f;
-      for (uint32_t i = 0; i < 256; i++) {
-        sum += stats.hist[i];
-        if (sum < pos_perc05)
-          perc05 = i;  // 5th perc.
-        if (sum < pos_median)
-          median_y = i;  // 50th perc.
-        if (sum < posPerc95)
-          perc95 = i;  // 95th perc.
-        else
-          break;
-      }
-
-      // Check if image is too dark
-      if ((std_y < 55) && (perc05 < 50)) {
-        if (median_y < 60 || stats.mean < 80 || perc95 < 130 ||
-            prop_low > 0.20) {
-          frame_cnt_dark_++;
-        } else {
-          frame_cnt_dark_ = 0;
-        }
-      } else {
-        frame_cnt_dark_ = 0;
-      }
-
-      // Check if image is too bright
-      if ((std_y < 52) && (perc95 > 200) && (median_y > 160)) {
-        if (median_y > 185 || stats.mean > 185 || perc05 > 140 ||
-            prop_high > 0.25) {
-          frame_cnt_bright_++;
-        } else {
-          frame_cnt_bright_ = 0;
-        }
-      } else {
-        frame_cnt_bright_ = 0;
-      }
-    } else {
-      frame_cnt_dark_ = 0;
-      frame_cnt_bright_ = 0;
-    }
-  } else {
-    frame_cnt_bright_++;
-    frame_cnt_dark_ = 0;
-  }
-
-  if (frame_cnt_dark_ > frame_cnt_alarm) {
-    return VideoProcessing::kDarkWarning;
-  } else if (frame_cnt_bright_ > frame_cnt_alarm) {
-    return VideoProcessing::kBrightWarning;
-  } else {
-    return VideoProcessing::kNoWarning;
-  }
-}
-
-}  // namespace webrtc