Major AEC3 render pipeline changes

webrtc/modules/audio_processing/aec3/render_buffer.h

 /*
  *  Copyright (c) 2017 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.
  */
 
-#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_FFT_BUFFER_H_
-#define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_FFT_BUFFER_H_
+#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_RENDER_BUFFER_H_
+#define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_RENDER_BUFFER_H_
 
 #include <memory>
 #include <vector>
 
 #include "webrtc/base/array_view.h"
 #include "webrtc/base/constructormagic.h"
+#include "webrtc/modules/audio_processing/aec3/aec3_fft.h"
 #include "webrtc/modules/audio_processing/aec3/fft_data.h"
 
 namespace webrtc {
 
-// Provides a circular buffer for 128 point real-valued FFT data.
-class FftBuffer {
+// Provides a buffer of the render data for the echo remover.
+class RenderBuffer {
  public:
-  // The constructor takes as parameters the size of the buffer, as well as a
-  // vector containing the number of FFTs that will be included in the spectral
-  // sums in the call to SpectralSum.
-  FftBuffer(Aec3Optimization optimization,
-            size_t size,
-            const std::vector<size_t> num_ffts_for_spectral_sums);
-  ~FftBuffer();
+  // The constructor takes, besides from the other parameters, a vector
+  // containing the number of FFTs that will be included in the spectral sums in
+  // the call to SpectralSum.
+  RenderBuffer(Aec3Optimization optimization,
+               size_t num_bands,
+               size_t size,
+               const std::vector<size_t> num_ffts_for_spectral_sums);
+  ~RenderBuffer();
 
-  // Insert an FFT into the buffer.
-  void Insert(const FftData& fft);
+  // Clears the buffer.
+  void Clear();
+
+  // Insert a block into the buffer.
+  void Insert(const std::vector<std::vector<float>>& block);
+
+  // Gets the last inserted block.
+  const std::vector<std::vector<float>>& MostRecentBlock() const {
+    return last_block_;
+  }
 
   // Get the spectrum from one of the FFTs in the buffer
   const std::array<float, kFftLengthBy2Plus1>& Spectrum(
       size_t buffer_offset_ffts) const {
     return spectrum_buffer_[(position_ + buffer_offset_ffts) %
                             fft_buffer_.size()];
   }
 
   // Returns the sum of the spectrums for a certain number of FFTs.
   const std::array<float, kFftLengthBy2Plus1>& SpectralSum(
       size_t num_ffts) const {
     RTC_DCHECK_EQ(spectral_sums_length_, num_ffts);
     return spectral_sums_[0];
   }
 
   // Returns the circular buffer.
   rtc::ArrayView<const FftData> Buffer() const { return fft_buffer_; }
 
   // Returns the current position in the circular buffer
   size_t Position() const { return position_; }
 
  private:
   const Aec3Optimization optimization_;
   std::vector<FftData> fft_buffer_;
   std::vector<std::array<float, kFftLengthBy2Plus1>> spectrum_buffer_;
   size_t spectral_sums_length_;
   std::vector<std::array<float, kFftLengthBy2Plus1>> spectral_sums_;
   size_t position_ = 0;
-
-  RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(FftBuffer);
+  std::vector<std::vector<float>> last_block_;
+  const Aec3Fft fft_;
+  RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(RenderBuffer);
 };
 
 }  // namespace webrtc
 
-#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_FFT_BUFFER_H_
+#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_RENDER_BUFFER_H_