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

webrtc/modules/audio_coding/neteq/time_stretch.h

Index: webrtc/modules/audio_coding/neteq/time_stretch.h
diff --git a/webrtc/modules/audio_coding/neteq/time_stretch.h b/webrtc/modules/audio_coding/neteq/time_stretch.h
index 7c84e1a15347fb1f3ba0bce09f18b000475cbdbe..14383d8dd73494d303be5d4bceba1e273ec4c2f9 100644
--- a/webrtc/modules/audio_coding/neteq/time_stretch.h
+++ b/webrtc/modules/audio_coding/neteq/time_stretch.h
@@ -39,7 +39,7 @@ class TimeStretch {
               const BackgroundNoise& background_noise)
       : sample_rate_hz_(sample_rate_hz),
         fs_mult_(sample_rate_hz / 8000),
-        num_channels_(static_cast<int>(num_channels)),
+        num_channels_(num_channels),
         master_channel_(0),  // First channel is master.
         background_noise_(background_noise),
         max_input_value_(0) {
@@ -48,7 +48,7 @@ class TimeStretch {
            sample_rate_hz_ == 32000 ||
            sample_rate_hz_ == 48000);
     assert(num_channels_ > 0);
-    assert(static_cast<int>(master_channel_) < num_channels_);
+    assert(master_channel_ < num_channels_);
     memset(auto_correlation_, 0, sizeof(auto_correlation_));
   }
 
@@ -60,7 +60,7 @@ class TimeStretch {
                       size_t input_len,
                       bool fast_mode,
                       AudioMultiVector* output,
-                      int16_t* length_change_samples);
+                      size_t* length_change_samples);
 
  protected:
   // Sets the parameters |best_correlation| and |peak_index| to suitable
@@ -68,7 +68,7 @@ class TimeStretch {
   // implemented by the sub-classes.
   virtual void SetParametersForPassiveSpeech(size_t input_length,
                                              int16_t* best_correlation,
-                                             int* peak_index) const = 0;
+                                             size_t* peak_index) const = 0;
 
   // Checks the criteria for performing the time-stretching operation and,
   // if possible, performs the time-stretching. This method must be implemented
@@ -82,16 +82,16 @@ class TimeStretch {
       bool fast_mode,
       AudioMultiVector* output) const = 0;
 
-  static const int kCorrelationLen = 50;
-  static const int kLogCorrelationLen = 6;  // >= log2(kCorrelationLen).
-  static const int kMinLag = 10;
-  static const int kMaxLag = 60;
-  static const int kDownsampledLen = kCorrelationLen + kMaxLag;
+  static const size_t kCorrelationLen = 50;
+  static const size_t kLogCorrelationLen = 6;  // >= log2(kCorrelationLen).
+  static const size_t kMinLag = 10;
+  static const size_t kMaxLag = 60;
+  static const size_t kDownsampledLen = kCorrelationLen + kMaxLag;
   static const int kCorrelationThreshold = 14746;  // 0.9 in Q14.
 
   const int sample_rate_hz_;
   const int fs_mult_;  // Sample rate multiplier = sample_rate_hz_ / 8000.
-  const int num_channels_;
+  const size_t num_channels_;
   const size_t master_channel_;
   const BackgroundNoise& background_noise_;
   int16_t max_input_value_;
@@ -107,7 +107,7 @@ class TimeStretch {
 
   // Performs a simple voice-activity detection based on the input parameters.
   bool SpeechDetection(int32_t vec1_energy, int32_t vec2_energy,
-                       int peak_index, int scaling) const;
+                       size_t peak_index, int scaling) const;
 
   DISALLOW_COPY_AND_ASSIGN(TimeStretch);
 };