Fix division by zero in NonlinearBeamformer

webrtc/modules/audio_processing/beamformer/nonlinear_beamformer.cc

 /*
  *  Copyright (c) 2014 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 453 matching lines @@
     float rpsiw,
     float ratio_rxiw_rxim,
     float rmw_r) {
   float rpsim = Norm(interf_cov_mat, eig_m_);
 
   float ratio = 0.f;
   if (rpsim > 0.f) {
     ratio = rpsiw / rpsim;
   }
 
-  return (1.f - std::min(kCutOffConstant, ratio / rmw_r)) /
-         (1.f - std::min(kCutOffConstant, ratio / ratio_rxiw_rxim));
+  float numerator = 1.f - kCutOffConstant;
+  if (rmw_r > 0.f) {
+    numerator = 1.f - std::min(kCutOffConstant, ratio / rmw_r);
+  }
+
+  float denominator = 1.f - kCutOffConstant;
+  if (ratio_rxiw_rxim > 0.f) {
+    denominator = 1.f - std::min(kCutOffConstant, ratio / ratio_rxiw_rxim);
+  }
+
+  return numerator / denominator;
 }
 
 void NonlinearBeamformer::ApplyMasks(const complex_f* const* input,
                                      complex_f* const* output) {
   complex_f* output_channel = output[0];
   for (size_t f_ix = 0; f_ix < kNumFreqBins; ++f_ix) {
     output_channel[f_ix] = complex_f(0.f, 0.f);
 
     const complex_f* delay_sum_mask_els =
         normalized_delay_sum_masks_[f_ix].elements()[0];
@@ skipping 75 matching lines @@
                    new_mask_ + high_mean_end_bin_ + 1);
   if (new_mask_[quantile] > kMaskTargetThreshold) {
     is_target_present_ = true;
     interference_blocks_count_ = 0;
   } else {
     is_target_present_ = interference_blocks_count_++ < hold_target_blocks_;
   }
 }
 
 }  // namespace webrtc