Revert of Moved ring-buffer related files from common_audio to audio_processing

webrtc/modules/audio_processing/utility/lapped_transform.cc

Index: webrtc/modules/audio_processing/utility/lapped_transform.cc
diff --git a/webrtc/modules/audio_processing/utility/lapped_transform.cc b/webrtc/modules/audio_processing/utility/lapped_transform.cc
deleted file mode 100644
index cb5496dfc411eb88915892aea308bc3b7e7f1490..0000000000000000000000000000000000000000
--- a/webrtc/modules/audio_processing/utility/lapped_transform.cc
+++ /dev/null
@@ -1,102 +0,0 @@
-/*
- *  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/modules/audio_processing/utility/lapped_transform.h"
-
-#include <algorithm>
-#include <cstdlib>
-#include <cstring>
-
-#include "webrtc/base/checks.h"
-#include "webrtc/common_audio/real_fourier.h"
-
-namespace webrtc {
-
-void LappedTransform::BlockThunk::ProcessBlock(const float* const* input,
-                                               size_t num_frames,
-                                               size_t num_input_channels,
-                                               size_t num_output_channels,
-                                               float* const* output) {
-  RTC_CHECK_EQ(num_input_channels, parent_->num_in_channels_);
-  RTC_CHECK_EQ(num_output_channels, parent_->num_out_channels_);
-  RTC_CHECK_EQ(parent_->block_length_, num_frames);
-
-  for (size_t i = 0; i < num_input_channels; ++i) {
-    memcpy(parent_->real_buf_.Row(i), input[i],
-           num_frames * sizeof(*input[0]));
-    parent_->fft_->Forward(parent_->real_buf_.Row(i),
-                           parent_->cplx_pre_.Row(i));
-  }
-
-  size_t block_length = RealFourier::ComplexLength(
-      RealFourier::FftOrder(num_frames));
-  RTC_CHECK_EQ(parent_->cplx_length_, block_length);
-  parent_->block_processor_->ProcessAudioBlock(parent_->cplx_pre_.Array(),
-                                               num_input_channels,
-                                               parent_->cplx_length_,
-                                               num_output_channels,
-                                               parent_->cplx_post_.Array());
-
-  for (size_t i = 0; i < num_output_channels; ++i) {
-    parent_->fft_->Inverse(parent_->cplx_post_.Row(i),
-                           parent_->real_buf_.Row(i));
-    memcpy(output[i], parent_->real_buf_.Row(i),
-           num_frames * sizeof(*input[0]));
-  }
-}
-
-LappedTransform::LappedTransform(size_t num_in_channels,
-                                 size_t num_out_channels,
-                                 size_t chunk_length,
-                                 const float* window,
-                                 size_t block_length,
-                                 size_t shift_amount,
-                                 Callback* callback)
-    : blocker_callback_(this),
-      num_in_channels_(num_in_channels),
-      num_out_channels_(num_out_channels),
-      block_length_(block_length),
-      chunk_length_(chunk_length),
-      block_processor_(callback),
-      blocker_(chunk_length_,
-               block_length_,
-               num_in_channels_,
-               num_out_channels_,
-               window,
-               shift_amount,
-               &blocker_callback_),
-      fft_(rtc::ScopedToUnique(
-          RealFourier::Create(RealFourier::FftOrder(block_length_)))),
-      cplx_length_(RealFourier::ComplexLength(fft_->order())),
-      real_buf_(num_in_channels,
-                block_length_,
-                RealFourier::kFftBufferAlignment),
-      cplx_pre_(num_in_channels,
-                cplx_length_,
-                RealFourier::kFftBufferAlignment),
-      cplx_post_(num_out_channels,
-                 cplx_length_,
-                 RealFourier::kFftBufferAlignment) {
-  RTC_CHECK(num_in_channels_ > 0 && num_out_channels_ > 0);
-  RTC_CHECK_GT(block_length_, 0u);
-  RTC_CHECK_GT(chunk_length_, 0u);
-  RTC_CHECK(block_processor_);
-
-  // block_length_ power of 2?
-  RTC_CHECK_EQ(0u, block_length_ & (block_length_ - 1));
-}
-
-void LappedTransform::ProcessChunk(const float* const* in_chunk,
-                                   float* const* out_chunk) {
-  blocker_.ProcessChunk(in_chunk, chunk_length_, num_in_channels_,
-                        num_out_channels_, out_chunk);
-}
-
-}  // namespace webrtc