Convert channel counts to size_t.

webrtc/common_audio/wav_header.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 14 matching lines @@
   virtual ~ReadableWav() {}
 };
 
 enum WavFormat {
   kWavFormatPcm   = 1,  // PCM, each sample of size bytes_per_sample
   kWavFormatALaw  = 6,  // 8-bit ITU-T G.711 A-law
   kWavFormatMuLaw = 7,  // 8-bit ITU-T G.711 mu-law
 };
 
 // Return true if the given parameters will make a well-formed WAV header.
-bool CheckWavParameters(int num_channels,
+bool CheckWavParameters(size_t num_channels,
                         int sample_rate,
                         WavFormat format,
                         size_t bytes_per_sample,
                         size_t num_samples);
 
 // Write a kWavHeaderSize bytes long WAV header to buf. The payload that
 // follows the header is supposed to have the specified number of interleaved
 // channels and contain the specified total number of samples of the specified
 // type. CHECKs the input parameters for validity.
 void WriteWavHeader(uint8_t* buf,
-                    int num_channels,
+                    size_t num_channels,
                     int sample_rate,
                     WavFormat format,
                     size_t bytes_per_sample,
                     size_t num_samples);
 
 // Read a WAV header from an implemented ReadableWav and parse the values into
 // the provided output parameters. ReadableWav is used because the header can
 // be variably sized. Returns false if the header is invalid.
 bool ReadWavHeader(ReadableWav* readable,
-                   int* num_channels,
+                   size_t* num_channels,
                    int* sample_rate,
                    WavFormat* format,
                    size_t* bytes_per_sample,
                    size_t* num_samples);
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_COMMON_AUDIO_WAV_HEADER_H_