[NOT FOR REVIEW] Convert channel counts to size_t.

webrtc/modules/audio_coding/main/acm2/acm_receiver.cc

 /*
  *  Copyright (c) 2013 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 327 matching lines @@
                 << static_cast<int>(header->payloadType)
                 << " Failed to insert packet";
     return -1;
   }
   return 0;
 }
 
 int AcmReceiver::GetAudio(int desired_freq_hz, AudioFrame* audio_frame) {
   enum NetEqOutputType type;
   size_t samples_per_channel;
-  int num_channels;
+  size_t num_channels;
   bool return_silence = false;
 
   {
     // Accessing members, take the lock.
     CriticalSectionScoped lock(crit_sect_.get());
 
     if (av_sync_) {
       assert(initial_delay_manager_.get());
       assert(late_packets_sync_stream_.get());
       return_silence = GetSilence(desired_freq_hz, audio_frame);
@@ skipping 109 matching lines @@
   } else {
     // Remain 0 until we have a valid |playout_timestamp|.
     audio_frame->timestamp_ = 0;
   }
 
   return 0;
 }
 
 int32_t AcmReceiver::AddCodec(int acm_codec_id,
                               uint8_t payload_type,
-                              int channels,
+                              size_t channels,
                               int sample_rate_hz,
                               AudioDecoder* audio_decoder) {
   assert(acm_codec_id >= 0);
   NetEqDecoder neteq_decoder = ACMCodecDB::neteq_decoders_[acm_codec_id];
 
   // Make sure the right decoder is registered for Opus.
   if (neteq_decoder == kDecoderOpus && channels == 2) {
     neteq_decoder = kDecoderOpus_2ch;
   }
 
@@ skipping 350 matching lines @@
 
 void AcmReceiver::GetDecodingCallStatistics(
     AudioDecodingCallStats* stats) const {
   CriticalSectionScoped lock(crit_sect_.get());
   *stats = call_stats_.GetDecodingStatistics();
 }
 
 }  // namespace acm2
 
 }  // namespace webrtc