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/*
* 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_RENDER_BUFFER_H_
#define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_RENDER_BUFFER_H_
#include <memory>
#include <vector>
#include "webrtc/modules/audio_processing/aec3/aec3_fft.h"
#include "webrtc/modules/audio_processing/aec3/fft_data.h"
#include "webrtc/rtc_base/array_view.h"
#include "webrtc/rtc_base/constructormagic.h"
namespace webrtc {
// Provides a buffer of the render data for the echo remover.
class RenderBuffer {
public:
// 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();
// 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;
std::vector<std::vector<float>> last_block_;
const Aec3Fft fft_;
RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(RenderBuffer);
};
} // namespace webrtc
#endif // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_RENDER_BUFFER_H_