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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 MODULES_AUDIO_PROCESSING_AEC3_RENDER_BUFFER_H_
#define MODULES_AUDIO_PROCESSING_AEC3_RENDER_BUFFER_H_
#include <array>
#include <memory>
#include "api/array_view.h"
#include "modules/audio_processing/aec3/fft_buffer.h"
#include "modules/audio_processing/aec3/fft_data.h"
#include "modules/audio_processing/aec3/matrix_buffer.h"
#include "modules/audio_processing/aec3/vector_buffer.h"
#include "rtc_base/constructormagic.h"
namespace webrtc {
// Provides a buffer of the render data for the echo remover.
class RenderBuffer {
public:
RenderBuffer(MatrixBuffer* block_buffer,
VectorBuffer* spectrum_buffer,
FftBuffer* fft_buffer);
~RenderBuffer();
// Get a block.
const std::vector<std::vector<float>>& Block(int buffer_offset_blocks) const {
int position =
block_buffer_->OffsetIndex(block_buffer_->read, buffer_offset_blocks);
return block_buffer_->buffer[position];
}
// Get the spectrum from one of the FFTs in the buffer.
rtc::ArrayView<const float> Spectrum(int buffer_offset_ffts) const {
int position = spectrum_buffer_->OffsetIndex(spectrum_buffer_->read,
buffer_offset_ffts);
return spectrum_buffer_->buffer[position];
}
// Returns the circular fft buffer.
rtc::ArrayView<const FftData> GetFftBuffer() const {
return fft_buffer_->buffer;
}
// Returns the current position in the circular buffer.
size_t Position() const {
RTC_DCHECK_EQ(spectrum_buffer_->read, fft_buffer_->read);
RTC_DCHECK_EQ(spectrum_buffer_->write, fft_buffer_->write);
return fft_buffer_->read;
}
// Returns the sum of the spectrums for a certain number of FFTs.
void SpectralSum(size_t num_spectra,
std::array<float, kFftLengthBy2Plus1>* X2) const;
// Returns the sums of the spectrums for two numbers of FFTs.
void SpectralSums(size_t num_spectra_shorter,
size_t num_spectra_longer,
std::array<float, kFftLengthBy2Plus1>* X2_shorter,
std::array<float, kFftLengthBy2Plus1>* X2_longer) const;
// Gets the recent activity seen in the render signal.
bool GetRenderActivity() const { return render_activity_; }
// Specifies the recent activity seen in the render signal.
void SetRenderActivity(bool activity) { render_activity_ = activity; }
// Returns the headroom between the write and the read positions in the
// buffer.
int Headroom() const {
// The write and read indices are decreased over time.
int headroom =
fft_buffer_->write < fft_buffer_->read
? fft_buffer_->read - fft_buffer_->write
: fft_buffer_->size - fft_buffer_->write + fft_buffer_->read;
RTC_DCHECK_LE(0, headroom);
RTC_DCHECK_GE(fft_buffer_->size, headroom);
return headroom;
}
// Returns a reference to the spectrum buffer.
const VectorBuffer& GetSpectrumBuffer() const { return *spectrum_buffer_; }
// Returns a reference to the block buffer.
const MatrixBuffer& GetBlockBuffer() const { return *block_buffer_; }
private:
const MatrixBuffer* const block_buffer_;
const VectorBuffer* const spectrum_buffer_;
const FftBuffer* const fft_buffer_;
bool render_activity_ = false;
RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(RenderBuffer);
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AEC3_RENDER_BUFFER_H_
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