Convert channel counts to size_t.

webrtc/modules/audio_coding/acm2/audio_coding_module.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 38 matching lines @@
   auto ci = acm2::RentACodec::CodecInstById(*codec_id);
   if (!ci)
     return -1;
   *codec = *ci;
   return 0;
 }
 
 int AudioCodingModule::Codec(const char* payload_name,
                              CodecInst* codec,
                              int sampling_freq_hz,
-                             int channels) {
+                             size_t channels) {
   rtc::Optional<CodecInst> ci = acm2::RentACodec::CodecInstByParams(
       payload_name, sampling_freq_hz, channels);
   if (ci) {
     *codec = *ci;
     return 0;
   } else {
     // We couldn't find a matching codec, so set the parameters to unacceptable
     // values and return.
     codec->plname[0] = '\0';
     codec->pltype = -1;
     codec->pacsize = 0;
     codec->rate = 0;
     codec->plfreq = 0;
     return -1;
   }
 }
 
 int AudioCodingModule::Codec(const char* payload_name,
                              int sampling_freq_hz,
-                             int channels) {
+                             size_t channels) {
   rtc::Optional<acm2::RentACodec::CodecId> ci =
       acm2::RentACodec::CodecIdByParams(payload_name, sampling_freq_hz,
                                         channels);
   if (!ci)
     return -1;
   rtc::Optional<int> i = acm2::RentACodec::CodecIndexFromId(*ci);
   return i ? *i : -1;
 }
 
 // Checks the validity of the parameters of the given codec
 bool AudioCodingModule::IsCodecValid(const CodecInst& codec) {
   bool valid = acm2::RentACodec::IsCodecValid(codec);
   if (!valid)
     WEBRTC_TRACE(webrtc::kTraceError, webrtc::kTraceAudioCoding, -1,
                  "Invalid codec setting");
   return valid;
 }
 
 }  // namespace webrtc