Convert channel counts to size_t.

webrtc/modules/audio_processing/high_pass_filter_impl.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 74 matching lines @@
   int16_t y_[4];
 };
 
 HighPassFilterImpl::HighPassFilterImpl(rtc::CriticalSection* crit)
     : crit_(crit) {
   RTC_DCHECK(crit_);
 }
 
 HighPassFilterImpl::~HighPassFilterImpl() {}
 
-void HighPassFilterImpl::Initialize(int channels, int sample_rate_hz) {
-  RTC_DCHECK_LE(0, channels);
+void HighPassFilterImpl::Initialize(size_t channels, int sample_rate_hz) {
   std::vector<rtc::scoped_ptr<BiquadFilter>> new_filters(channels);
-  for (int i = 0; i < channels; i++) {
+  for (size_t i = 0; i < channels; i++) {
     new_filters[i].reset(new BiquadFilter(sample_rate_hz));
   }
   rtc::CritScope cs(crit_);
   filters_.swap(new_filters);
 }
 
 void HighPassFilterImpl::ProcessCaptureAudio(AudioBuffer* audio) {
   RTC_DCHECK(audio);
   rtc::CritScope cs(crit_);
   if (!enabled_) {
     return;
   }
 
   RTC_DCHECK_GE(160u, audio->num_frames_per_band());
-  RTC_DCHECK_EQ(filters_.size(), static_cast<size_t>(audio->num_channels()));
+  RTC_DCHECK_EQ(filters_.size(), audio->num_channels());
   for (size_t i = 0; i < filters_.size(); i++) {
     filters_[i]->Process(audio->split_bands(i)[kBand0To8kHz],
                          audio->num_frames_per_band());
   }
 }
 
 int HighPassFilterImpl::Enable(bool enable) {
   rtc::CritScope cs(crit_);
   if (!enabled_ && enable) {
     for (auto& filter : filters_) {
       filter->Reset();
     }
   }
   enabled_ = enable;
   return AudioProcessing::kNoError;
 }
 
 bool HighPassFilterImpl::is_enabled() const {
   rtc::CritScope cs(crit_);
   return enabled_;
 }
 }  // namespace webrtc