[NOT FOR REVIEW] Convert channel counts to size_t.

webrtc/common_audio/blocker.cc

 /*
  *  Copyright (c) 2014 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.
  */
 
 #include "webrtc/common_audio/blocker.h"
 
 #include <string.h>
 
 #include "webrtc/base/checks.h"
 
 namespace {
 
 // Adds |a| and |b| frame by frame into |result| (basically matrix addition).
 void AddFrames(const float* const* a,
                size_t a_start_index,
                const float* const* b,
                int b_start_index,
                size_t num_frames,
-               int num_channels,
+               size_t num_channels,
                float* const* result,
                size_t result_start_index) {
-  for (int i = 0; i < num_channels; ++i) {
+  for (size_t i = 0; i < num_channels; ++i) {
     for (size_t j = 0; j < num_frames; ++j) {
       result[i][j + result_start_index] =
           a[i][j + a_start_index] + b[i][j + b_start_index];
     }
   }
 }
 
 // Copies |src| into |dst| channel by channel.
 void CopyFrames(const float* const* src,
                 size_t src_start_index,
                 size_t num_frames,
-                int num_channels,
+                size_t num_channels,
                 float* const* dst,
                 size_t dst_start_index) {
-  for (int i = 0; i < num_channels; ++i) {
+  for (size_t i = 0; i < num_channels; ++i) {
     memcpy(&dst[i][dst_start_index],
            &src[i][src_start_index],
            num_frames * sizeof(dst[i][dst_start_index]));
   }
 }
 
 // Moves |src| into |dst| channel by channel.
 void MoveFrames(const float* const* src,
                 size_t src_start_index,
                 size_t num_frames,
-                int num_channels,
+                size_t num_channels,
                 float* const* dst,
                 size_t dst_start_index) {
-  for (int i = 0; i < num_channels; ++i) {
+  for (size_t i = 0; i < num_channels; ++i) {
     memmove(&dst[i][dst_start_index],
             &src[i][src_start_index],
             num_frames * sizeof(dst[i][dst_start_index]));
   }
 }
 
 void ZeroOut(float* const* buffer,
              size_t starting_idx,
              size_t num_frames,
-             int num_channels) {
-  for (int i = 0; i < num_channels; ++i) {
+             size_t num_channels) {
+  for (size_t i = 0; i < num_channels; ++i) {
     memset(&buffer[i][starting_idx], 0,
            num_frames * sizeof(buffer[i][starting_idx]));
   }
 }
 
 // Pointwise multiplies each channel of |frames| with |window|. Results are
 // stored in |frames|.
 void ApplyWindow(const float* window,
                  size_t num_frames,
-                 int num_channels,
+                 size_t num_channels,
                  float* const* frames) {
-  for (int i = 0; i < num_channels; ++i) {
+  for (size_t i = 0; i < num_channels; ++i) {
     for (size_t j = 0; j < num_frames; ++j) {
       frames[i][j] = frames[i][j] * window[j];
     }
   }
 }
 
 size_t gcd(size_t a, size_t b) {
   size_t tmp;
   while (b) {
      tmp = a;
      a = b;
      b = tmp % b;
   }
   return a;
 }
 
 }  // namespace
 
 namespace webrtc {
 
 Blocker::Blocker(size_t chunk_size,
                  size_t block_size,
-                 int num_input_channels,
-                 int num_output_channels,
+                 size_t num_input_channels,
+                 size_t num_output_channels,
                  const float* window,
                  size_t shift_amount,
                  BlockerCallback* callback)
     : chunk_size_(chunk_size),
       block_size_(block_size),
       num_input_channels_(num_input_channels),
       num_output_channels_(num_output_channels),
       initial_delay_(block_size_ - gcd(chunk_size, shift_amount)),
       frame_offset_(0),
       input_buffer_(num_input_channels_, chunk_size_ + initial_delay_),
@@ skipping 44 matching lines @@
 // 6. For both the input and the output buffers, we copy sections _b_ and _c_
 //    into section _a_ and _b_.
 // 7. We set the new frame_offset to be the difference between the first frame
 //    of |bl| and the border between sections _a_ and _b_.
 //
 // * delay here refers to inintial_delay_
 //
 // TODO(claguna): Look at using ring buffers to eliminate some copies.
 void Blocker::ProcessChunk(const float* const* input,
                            size_t chunk_size,
-                           int num_input_channels,
-                           int num_output_channels,
+                           size_t num_input_channels,
+                           size_t num_output_channels,
                            float* const* output) {
   CHECK_EQ(chunk_size, chunk_size_);
   CHECK_EQ(num_input_channels, num_input_channels_);
   CHECK_EQ(num_output_channels, num_output_channels_);
 
   input_buffer_.Write(input, num_input_channels, chunk_size_);
   size_t first_frame_in_block = frame_offset_;
 
   // Loop through blocks.
   while (first_frame_in_block < chunk_size_) {
@@ skipping 46 matching lines @@
   ZeroOut(output_buffer_.channels(),
           initial_delay_,
           chunk_size_,
           num_output_channels_);
 
   // Calculate new starting frames.
   frame_offset_ = first_frame_in_block - chunk_size_;
 }
 
 }  // namespace webrtc