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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_TRANSIENT_VOICE_PROBABILITY_DELAY_UNIT_H_
#define MODULES_AUDIO_PROCESSING_TRANSIENT_VOICE_PROBABILITY_DELAY_UNIT_H_
#include <array>
namespace webrtc {
// Iteratively produces a sequence of delayed voice probability values given a
// fixed delay between 0 and 20 ms and given a sequence of voice probability
// values observed every 10 ms. Supports fractional delays, that are delays
// which are not a multiple integer of 10 ms. Applies interpolation with
// fractional delays; otherwise, returns a previously observed value according
// to the given fixed delay.
class VoiceProbabilityDelayUnit {
public:
// Ctor. `delay_num_samples` is the delay in number of samples and it must be
// non-negative and less than 20 ms.
VoiceProbabilityDelayUnit(int delay_num_samples, int sample_rate_hz);
// Handles delay and sample rate changes and resets the delay unit.
void Initialize(int delay_num_samples, int sample_rate_hz);
// Observes `voice_probability` and returns a delayed voice probability.
float Delay(float voice_probability);
private:
std::array<float, 3> weights_;
std::array<float, 2> last_probabilities_;
};
} // namespace webrtc
#endif // MODULES_AUDIO_PROCESSING_TRANSIENT_VOICE_PROBABILITY_DELAY_UNIT_H_
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