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

webrtc/modules/audio_processing/echo_cancellation_impl.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 73 matching lines @@
   int err = apm_->kNoError;
 
   // The ordering convention must be followed to pass to the correct AEC.
   size_t handle_index = 0;
   for (int i = 0; i < apm_->num_output_channels(); i++) {
     for (int j = 0; j < audio->num_channels(); j++) {
       Handle* my_handle = static_cast<Handle*>(handle(handle_index));
       err = WebRtcAec_BufferFarend(
           my_handle,
           audio->split_bands_const_f(j)[kBand0To8kHz],
-          static_cast<int16_t>(audio->num_frames_per_band()));
+          audio->num_frames_per_band());
 
       if (err != apm_->kNoError) {
         return GetHandleError(my_handle);  // TODO(ajm): warning possible?
       }
 
       handle_index++;
     }
   }
 
   return apm_->kNoError;
@@ skipping 21 matching lines @@
   size_t handle_index = 0;
   stream_has_echo_ = false;
   for (int i = 0; i < audio->num_channels(); i++) {
     for (int j = 0; j < apm_->num_reverse_channels(); j++) {
       Handle* my_handle = handle(handle_index);
       err = WebRtcAec_Process(
           my_handle,
           audio->split_bands_const_f(i),
           audio->num_bands(),
           audio->split_bands_f(i),
-          static_cast<int16_t>(audio->num_frames_per_band()),
+          audio->num_frames_per_band(),
           apm_->stream_delay_ms(),
           stream_drift_samples_);
 
       if (err != apm_->kNoError) {
         err = GetHandleError(my_handle);
         // TODO(ajm): Figure out how to return warnings properly.
         if (err != apm_->kBadStreamParameterWarning) {
           return err;
         }
       }
@@ skipping 225 matching lines @@
 int EchoCancellationImpl::num_handles_required() const {
   return apm_->num_output_channels() *
          apm_->num_reverse_channels();
 }
 
 int EchoCancellationImpl::GetHandleError(void* handle) const {
   assert(handle != NULL);
   return MapError(WebRtcAec_get_error_code(static_cast<Handle*>(handle)));
 }
 }  // namespace webrtc