Update audio code to use size_t more correctly,

webrtc/modules/audio_coding/codecs/pcm16b/audio_encoder_pcm16b.cc

 /*
  *  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.
  */
 
 #include "webrtc/modules/audio_coding/codecs/pcm16b/include/audio_encoder_pcm16b.h"
 
 #include "webrtc/base/checks.h"
 #include "webrtc/common_types.h"
 #include "webrtc/modules/audio_coding/codecs/pcm16b/include/pcm16b.h"
 
 namespace webrtc {
 
 bool AudioEncoderPcm16B::Config::IsOk() const {
   if ((sample_rate_hz != 8000) && (sample_rate_hz != 16000) &&
       (sample_rate_hz != 32000) && (sample_rate_hz != 48000))
     return false;
   return AudioEncoderPcm::Config::IsOk();
 }
 
-int16_t AudioEncoderPcm16B::EncodeCall(const int16_t* audio,
-                                       size_t input_len,
-                                       uint8_t* encoded) {
-  return WebRtcPcm16b_Encode(audio, static_cast<int16_t>(input_len), encoded);
+size_t AudioEncoderPcm16B::EncodeCall(const int16_t* audio,
+                                      size_t input_len,
+                                      uint8_t* encoded) {
+  return WebRtcPcm16b_Encode(audio, input_len, encoded);
 }
 
 int AudioEncoderPcm16B::BytesPerSample() const {
   return 2;
 }
 
 namespace {
 AudioEncoderPcm16B::Config CreateConfig(const CodecInst& codec_inst) {
   AudioEncoderPcm16B::Config config;
   config.num_channels = codec_inst.channels;
   config.sample_rate_hz = codec_inst.plfreq;
   config.frame_size_ms = rtc::CheckedDivExact(
       codec_inst.pacsize, rtc::CheckedDivExact(config.sample_rate_hz, 1000));
   config.payload_type = codec_inst.pltype;
   return config;
 }
 }  // namespace
 
 AudioEncoderMutablePcm16B::AudioEncoderMutablePcm16B(
     const CodecInst& codec_inst)
     : AudioEncoderMutableImpl<AudioEncoderPcm16B>(CreateConfig(codec_inst)) {
 }
 
 }  // namespace webrtc