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

webrtc/modules/audio_processing/audio_buffer.cc

Index: webrtc/modules/audio_processing/audio_buffer.cc
diff --git a/webrtc/modules/audio_processing/audio_buffer.cc b/webrtc/modules/audio_processing/audio_buffer.cc
index 6f732624930fb5d04e8ed860dd442d71a9fc91a3..81790a159be933342591902f6c31dbfa22873cec 100644
--- a/webrtc/modules/audio_processing/audio_buffer.cc
+++ b/webrtc/modules/audio_processing/audio_buffer.cc
@@ -19,9 +19,9 @@
 namespace webrtc {
 namespace {
 
-const int kSamplesPer16kHzChannel = 160;
-const int kSamplesPer32kHzChannel = 320;
-const int kSamplesPer48kHzChannel = 480;
+const size_t kSamplesPer16kHzChannel = 160;
+const size_t kSamplesPer32kHzChannel = 320;
+const size_t kSamplesPer48kHzChannel = 480;
 
 int KeyboardChannelIndex(const StreamConfig& stream_config) {
   if (!stream_config.has_keyboard()) {
@@ -32,23 +32,22 @@ int KeyboardChannelIndex(const StreamConfig& stream_config) {
   return stream_config.num_channels();
 }
 
-int NumBandsFromSamplesPerChannel(int num_frames) {
-  int num_bands = 1;
+size_t NumBandsFromSamplesPerChannel(size_t num_frames) {
+  size_t num_bands = 1;
   if (num_frames == kSamplesPer32kHzChannel ||
       num_frames == kSamplesPer48kHzChannel) {
-    num_bands = rtc::CheckedDivExact(num_frames,
-                                     static_cast<int>(kSamplesPer16kHzChannel));
+    num_bands = rtc::CheckedDivExact(num_frames, kSamplesPer16kHzChannel);
   }
   return num_bands;
 }
 
 }  // namespace
 
-AudioBuffer::AudioBuffer(int input_num_frames,
+AudioBuffer::AudioBuffer(size_t input_num_frames,
                          int num_input_channels,
-                         int process_num_frames,
+                         size_t process_num_frames,
                          int num_process_channels,
-                         int output_num_frames)
+                         size_t output_num_frames)
   : input_num_frames_(input_num_frames),
     num_input_channels_(num_input_channels),
     proc_num_frames_(process_num_frames),
@@ -345,20 +344,20 @@ void AudioBuffer::set_num_channels(int num_channels) {
   num_channels_ = num_channels;
 }
 
-int AudioBuffer::num_frames() const {
+size_t AudioBuffer::num_frames() const {
   return proc_num_frames_;
 }
 
-int AudioBuffer::num_frames_per_band() const {
+size_t AudioBuffer::num_frames_per_band() const {
   return num_split_frames_;
 }
 
-int AudioBuffer::num_keyboard_frames() const {
+size_t AudioBuffer::num_keyboard_frames() const {
   // We don't resample the keyboard channel.
   return input_num_frames_;
 }
 
-int AudioBuffer::num_bands() const {
+size_t AudioBuffer::num_bands() const {
   return num_bands_;
 }