Update a ton of audio code to use size_t more correctly and in general reduce

webrtc/common_audio/signal_processing/resample_by_2_mips.c

 /*
  *  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 11 matching lines @@
 // allpass filter coefficients.
 static const uint16_t kResampleAllpass1[3] = {3284, 24441, 49528};
 static const uint16_t kResampleAllpass2[3] = {12199, 37471, 60255};
 
 // Multiply a 32-bit value with a 16-bit value and accumulate to another input:
 #define MUL_ACCUM_1(a, b, c) WEBRTC_SPL_SCALEDIFF32(a, b, c)
 #define MUL_ACCUM_2(a, b, c) WEBRTC_SPL_SCALEDIFF32(a, b, c)
 
 // decimator
 void WebRtcSpl_DownsampleBy2(const int16_t* in,
-                             int len,
+                             size_t len,
                              int16_t* out,
                              int32_t* filtState) {
   int32_t out32;
-  int i, len1;
+  size_t i, len1;
 
   register int32_t state0 = filtState[0];
   register int32_t state1 = filtState[1];
   register int32_t state2 = filtState[2];
   register int32_t state3 = filtState[3];
   register int32_t state4 = filtState[4];
   register int32_t state5 = filtState[5];
   register int32_t state6 = filtState[6];
   register int32_t state7 = filtState[7];
 
@@ skipping 234 matching lines @@
     "sw       %[state7],      28(%[filtState])    \n\t"
     :
     : [state0] "r" (state0), [state1] "r" (state1), [state2] "r" (state2),
       [state3] "r" (state3), [state4] "r" (state4), [state5] "r" (state5),
       [state6] "r" (state6), [state7] "r" (state7), [filtState] "r" (filtState)
     : "memory"
   );
 }
 
 #endif  // #if defined(MIPS32_LE)