Match existing type usage better.

webrtc/modules/utility/source/coder.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 67 matching lines @@
 
 int32_t AudioCoder::Encode(const AudioFrame& audio,
                            int8_t* encodedData,
                            size_t& encodedLengthInBytes)
 {
     // Fake a timestamp in case audio doesn't contain a correct timestamp.
     // Make a local copy of the audio frame since audio is const
     AudioFrame audioFrame;
     audioFrame.CopyFrom(audio);
     audioFrame.timestamp_ = _encodeTimestamp;
-    _encodeTimestamp += audioFrame.samples_per_channel_;
+    _encodeTimestamp += static_cast<uint32_t>(audioFrame.samples_per_channel_);
 
     // For any codec with a frame size that is longer than 10 ms the encoded
     // length in bytes should be zero until a a full frame has been encoded.
     _encodedLengthInBytes = 0;
     if(_acm->Add10MsData((AudioFrame&)audioFrame) == -1)
     {
         return -1;
     }
     _encodedData = encodedData;
     encodedLengthInBytes = _encodedLengthInBytes;
     return 0;
 }
 
 int32_t AudioCoder::SendData(
     FrameType /* frameType */,
     uint8_t   /* payloadType */,
     uint32_t  /* timeStamp */,
     const uint8_t*  payloadData,
     size_t  payloadSize,
     const RTPFragmentationHeader* /* fragmentation*/)
 {
     memcpy(_encodedData,payloadData,sizeof(uint8_t) * payloadSize);
     _encodedLengthInBytes = payloadSize;
     return 0;
 }
 }  // namespace webrtc