Fix issue where video scaling gets stuck at low resolution

webrtc/media/base/videoadapter.cc

 /*
  *  Copyright (c) 2010 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.
  */
 
@@ skipping 42 matching lines @@
 
   // Don't scale up original.
   if (target_pixels >= input_pixels)
     return Fraction{1, 1};
 
   Fraction current_scale = Fraction{1, 1};
   Fraction best_scale = Fraction{1, 1};
   // The minimum (absolute) difference between the number of output pixels and
   // the target pixel count.
   int min_pixel_diff = std::numeric_limits<int>::max();
-  if (input_pixels < max_pixels) {
+  if (input_pixels <= max_pixels) {
     // Start condition for 1/1 case, if it is less than max.
     min_pixel_diff = std::abs(input_pixels - target_pixels);
   }
 
   // Alternately scale down by 2/3 and 3/4. This results in fractions which are
   // effectively scalable. For instance, starting at 1280x720 will result in
   // the series (3/4) => 960x540, (1/2) => 640x360, (3/8) => 480x270,
   // (1/4) => 320x180, (3/16) => 240x125, (1/8) => 160x90.
   while (current_scale.scale_pixel_count(input_pixels) > target_pixels) {
     if (current_scale.numerator % 3 == 0 &&
@@ skipping 179 matching lines @@
     const rtc::Optional<int>& target_pixel_count,
     const rtc::Optional<int>& max_pixel_count) {
   rtc::CritScope cs(&critical_section_);
   resolution_request_max_pixel_count_ =
       max_pixel_count.value_or(std::numeric_limits<int>::max());
   resolution_request_target_pixel_count_ =
       target_pixel_count.value_or(resolution_request_max_pixel_count_);
 }
 
 }  // namespace cricket