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/*
* Copyright (c) 2022 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_BLOCK_H_
#define MODULES_AUDIO_PROCESSING_AEC3_BLOCK_H_
#include <array>
#include <vector>
#include "api/array_view.h"
#include "modules/audio_processing/aec3/aec3_common.h"
namespace webrtc {
// Contains one or more channels of 4 milliseconds of audio data.
// The audio is split in one or more frequency bands, each with a sampling
// rate of 16 kHz.
class Block {
public:
Block(int num_bands, int num_channels, float default_value = 0.0f)
: num_bands_(num_bands),
num_channels_(num_channels),
data_(num_bands * num_channels * kBlockSize, default_value) {}
// Returns the number of bands.
int NumBands() const { return num_bands_; }
// Returns the number of channels.
int NumChannels() const { return num_channels_; }
// Modifies the number of channels and sets all samples to zero.
void SetNumChannels(int num_channels) {
num_channels_ = num_channels;
data_.resize(num_bands_ * num_channels_ * kBlockSize);
std::fill(data_.begin(), data_.end(), 0.0f);
}
// Iterators for accessing the data.
auto begin(int band, int channel) {
return data_.begin() + GetIndex(band, channel);
}
auto begin(int band, int channel) const {
return data_.begin() + GetIndex(band, channel);
}
auto end(int band, int channel) { return begin(band, channel) + kBlockSize; }
auto end(int band, int channel) const {
return begin(band, channel) + kBlockSize;
}
// Access data via ArrayView.
ArrayView<float, kBlockSize> View(int band, int channel) {
return ArrayView<float, kBlockSize>(&data_[GetIndex(band, channel)],
kBlockSize);
}
ArrayView<const float, kBlockSize> View(int band, int channel) const {
return ArrayView<const float, kBlockSize>(&data_[GetIndex(band, channel)],
kBlockSize);
}
// Lets two Blocks swap audio data.
void Swap(Block& b) {
std::swap(num_bands_, b.num_bands_);
std::swap(num_channels_, b.num_channels_);
data_.swap(b.data_);
}
private:
// Returns the index of the first sample of the requested |band| and
// |channel|.
int GetIndex(int band, int channel) const {
return (band * num_channels_ + channel) * kBlockSize;
}
int num_bands_;
int num_channels_;
std::vector<float> data_;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_AEC3_BLOCK_H_
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