Convert channel counts to size_t.

webrtc/common_audio/wav_file.h

Index: webrtc/common_audio/wav_file.h
diff --git a/webrtc/common_audio/wav_file.h b/webrtc/common_audio/wav_file.h
index eb2ce1e31d9e8bd431abd072ff705528025d4ac0..e656eb8643e5af18ccaaca48bd215021e99ff6bc 100644
--- a/webrtc/common_audio/wav_file.h
+++ b/webrtc/common_audio/wav_file.h
@@ -27,7 +27,7 @@ class WavFile {
   virtual ~WavFile() {}
 
   virtual int sample_rate() const = 0;
-  virtual int num_channels() const = 0;
+  virtual size_t num_channels() const = 0;
   virtual size_t num_samples() const = 0;
 
   // Returns a human-readable string containing the audio format.
@@ -39,7 +39,7 @@ class WavFile {
 class WavWriter final : public WavFile {
  public:
   // Open a new WAV file for writing.
-  WavWriter(const std::string& filename, int sample_rate, int num_channels);
+  WavWriter(const std::string& filename, int sample_rate, size_t num_channels);
 
   // Close the WAV file, after writing its header.
   ~WavWriter();
@@ -51,13 +51,13 @@ class WavWriter final : public WavFile {
   void WriteSamples(const int16_t* samples, size_t num_samples);
 
   int sample_rate() const override { return sample_rate_; }
-  int num_channels() const override { return num_channels_; }
+  size_t num_channels() const override { return num_channels_; }
   size_t num_samples() const override { return num_samples_; }
 
  private:
   void Close();
   const int sample_rate_;
-  const int num_channels_;
+  const size_t num_channels_;
   size_t num_samples_;  // Total number of samples written to file.
   FILE* file_handle_;  // Output file, owned by this class
 
@@ -79,13 +79,13 @@ class WavReader final : public WavFile {
   size_t ReadSamples(size_t num_samples, int16_t* samples);
 
   int sample_rate() const override { return sample_rate_; }
-  int num_channels() const override { return num_channels_; }
+  size_t num_channels() const override { return num_channels_; }
   size_t num_samples() const override { return num_samples_; }
 
  private:
   void Close();
   int sample_rate_;
-  int num_channels_;
+  size_t num_channels_;
   size_t num_samples_;  // Total number of samples in the file.
   size_t num_samples_remaining_;
   FILE* file_handle_;  // Input file, owned by this class.
@@ -102,13 +102,13 @@ extern "C" {
 typedef struct rtc_WavWriter rtc_WavWriter;
 rtc_WavWriter* rtc_WavOpen(const char* filename,
                            int sample_rate,
-                           int num_channels);
+                           size_t num_channels);
 void rtc_WavClose(rtc_WavWriter* wf);
 void rtc_WavWriteSamples(rtc_WavWriter* wf,
                          const float* samples,
                          size_t num_samples);
 int rtc_WavSampleRate(const rtc_WavWriter* wf);
-int rtc_WavNumChannels(const rtc_WavWriter* wf);
+size_t rtc_WavNumChannels(const rtc_WavWriter* wf);
 size_t rtc_WavNumSamples(const rtc_WavWriter* wf);
 
 #ifdef __cplusplus