[NOT FOR REVIEW] Convert channel counts to size_t.

webrtc/modules/audio_processing/test/test_utils.h

 /*
  *  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 31 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(RawFile);
 };
 
 void WriteIntData(const int16_t* data,
                   size_t length,
                   WavWriter* wav_file,
                   RawFile* raw_file);
 
 void WriteFloatData(const float* const* data,
-                    int samples_per_channel,
-                    int num_channels,
+                    size_t samples_per_channel,
+                    size_t num_channels,
                     WavWriter* wav_file,
                     RawFile* raw_file);
 
 // Exits on failure; do not use in unit tests.
 FILE* OpenFile(const std::string& filename, const char* mode);
 
 int SamplesFromRate(int rate);
 
 void SetFrameSampleRate(AudioFrame* frame,
                         int sample_rate_hz);
 
 template <typename T>
 void SetContainerFormat(int sample_rate_hz,
-                        int num_channels,
+                        size_t num_channels,
                         AudioFrame* frame,
                         rtc::scoped_ptr<ChannelBuffer<T> >* cb) {
   SetFrameSampleRate(frame, sample_rate_hz);
   frame->num_channels_ = num_channels;
   cb->reset(new ChannelBuffer<T>(frame->samples_per_channel_, num_channels));
 }
 
-AudioProcessing::ChannelLayout LayoutFromChannels(int num_channels);
+AudioProcessing::ChannelLayout LayoutFromChannels(size_t num_channels);
 
 template <typename T>
-float ComputeSNR(const T* ref, const T* test, int length, float* variance) {
+float ComputeSNR(const T* ref, const T* test, size_t length, float* variance) {
   float mse = 0;
   float mean = 0;
   *variance = 0;
-  for (int i = 0; i < length; ++i) {
+  for (size_t i = 0; i < length; ++i) {
     T error = ref[i] - test[i];
     mse += error * error;
     *variance += ref[i] * ref[i];
     mean += ref[i];
   }
   mse /= length;
   *variance /= length;
   mean /= length;
   *variance -= mean * mean;
 
@@ skipping 21 matching lines @@
 // Parses the array geometry from the command line.
 //
 // If a vector with size != num_mics is returned, an error has occurred and an
 // appropriate error message has been printed to stdout.
 std::vector<Point> ParseArrayGeometry(const std::string& mic_positions,
                                       size_t num_mics);
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_TEST_TEST_UTILS_H_