Update audio code to use size_t more correctly,

webrtc/modules/audio_coding/codecs/pcm16b/include/pcm16b.h

 /*
  *  Copyright (c) 2011 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.
  */
 
 #ifndef WEBRTC_MODULES_AUDIO_CODING_CODECS_PCM16B_MAIN_INTERFACE_PCM16B_H_
 #define WEBRTC_MODULES_AUDIO_CODING_CODECS_PCM16B_MAIN_INTERFACE_PCM16B_H_
 /*
  * Define the fixpoint numeric formats
  */
 
+#include <stddef.h>
+
 #include "webrtc/typedefs.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 /****************************************************************************
  * WebRtcPcm16b_Encode(...)
  *
  * "Encode" a sample vector to 16 bit linear (Encoded standard is big endian)
  *
  * Input:
  *              - speech        : Input speech vector
  *              - len           : Number of samples in speech vector
  *
  * Output:
  *              - encoded       : Encoded data vector (big endian 16 bit)
  *
  * Returned value               : Length (in bytes) of coded data.
  *                                Always equal to twice the len input parameter.
  */
 
-int16_t WebRtcPcm16b_Encode(const int16_t* speech,
-                            int16_t len,
-                            uint8_t* encoded);
+size_t WebRtcPcm16b_Encode(const int16_t* speech,
+                           size_t len,
+                           uint8_t* encoded);
 
 /****************************************************************************
  * WebRtcPcm16b_Decode(...)
  *
  * "Decode" a vector to 16 bit linear (Encoded standard is big endian)
  *
  * Input:
  *              - encoded       : Encoded data vector (big endian 16 bit)
  *              - len           : Number of bytes in encoded
  *
  * Output:
  *              - speech        : Decoded speech vector
  *
  * Returned value               : Samples in speech
  */
 
-int16_t WebRtcPcm16b_Decode(const uint8_t* encoded,
-                            int16_t len,
-                            int16_t* speech);
+size_t WebRtcPcm16b_Decode(const uint8_t* encoded,
+                           size_t len,
+                           int16_t* speech);
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif /* PCM16B */