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

webrtc/modules/audio_processing/three_band_filter_bank.h

 /*
  *  Copyright (c) 2015 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 16 matching lines @@
 // * Pass-band frequency = 0.147 (7kHz at 48kHz)
 // * Stop-band attenuation = 40dB
 // * Stop-band frequency = 0.192 (9.2kHz at 48kHz)
 // * Delay = 24 samples (500us at 48kHz)
 // * Linear phase
 // This filter bank does not satisfy perfect reconstruction. The SNR after
 // analysis and synthesis (with no processing in between) is approximately 9.5dB
 // depending on the input signal after compensating for the delay.
 class ThreeBandFilterBank final {
  public:
-  explicit ThreeBandFilterBank(int length);
+  explicit ThreeBandFilterBank(size_t length);
 
   // Splits |in| into 3 downsampled frequency bands in |out|.
   // |length| is the |in| length. Each of the 3 bands of |out| has to have a
   // length of |length| / 3.
-  void Analysis(const float* in, int length, float* const* out);
+  void Analysis(const float* in, size_t length, float* const* out);
 
   // Merges the 3 downsampled frequency bands in |in| into |out|.
   // |split_length| is the length of each band of |in|. |out| has to have at
   // least a length of 3 * |split_length|.
-  void Synthesis(const float* const* in, int split_length, float* out);
+  void Synthesis(const float* const* in, size_t split_length, float* out);
 
  private:
   void DownModulate(const float* in,
-                    int split_length,
-                    int offset,
+                    size_t split_length,
+                    size_t offset,
                     float* const* out);
   void UpModulate(const float* const* in,
-                  int split_length,
-                  int offset,
+                  size_t split_length,
+                  size_t offset,
                   float* out);
 
   std::vector<float> in_buffer_;
   std::vector<float> out_buffer_;
   ScopedVector<SparseFIRFilter> analysis_filters_;
   ScopedVector<SparseFIRFilter> synthesis_filters_;
   std::vector<std::vector<float>> dct_modulation_;
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_AUDIO_PROCESSING_THREE_BAND_FILTER_BANK_H_