Remove zero-divide in VCMContentMetricsProcessing.

webrtc/modules/video_coding/content_metrics_processing.cc

 /*
  *  Copyright (c) 2012 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 26 matching lines @@
 int VCMContentMetricsProcessing::Reset() {
   recursive_avg_->Reset();
   uniform_avg_->Reset();
   frame_cnt_uniform_avg_ = 0;
   avg_motion_level_ = 0.0f;
   avg_spatial_level_ = 0.0f;
   return VCM_OK;
 }
 
 void VCMContentMetricsProcessing::UpdateFrameRate(uint32_t frameRate) {
+  if (frameRate == 0)
+    frameRate = 1;
   // Update factor for recursive averaging.
   recursive_avg_factor_ = static_cast<float>(1000.0f) /
                           static_cast<float>(frameRate * kQmMinIntervalMs);
 }
 
 VideoContentMetrics* VCMContentMetricsProcessing::LongTermAvgData() {
   return recursive_avg_;
 }
 
 VideoContentMetrics* VCMContentMetricsProcessing::ShortTermAvgData() {
@@ skipping 58 matching lines @@
   recursive_avg_->spatial_pred_err_v =
       (1 - recursive_avg_factor_) * recursive_avg_->spatial_pred_err_v +
       recursive_avg_factor_ * contentMetrics->spatial_pred_err_v;
 
   // Motion metric: Derived from NFD (normalized frame difference).
   recursive_avg_->motion_magnitude =
       (1 - recursive_avg_factor_) * recursive_avg_->motion_magnitude +
       recursive_avg_factor_ * contentMetrics->motion_magnitude;
 }
 }  // namespace webrtc