c6abf6cd3f
Some API deprecation -- ExperimentalAgc and ExperimentalNs are gone. We're continuing to carry iSAC even though it's gone upstream, but maybe we'll want to drop that soon.
81 lines
2.9 KiB
C++
81 lines
2.9 KiB
C++
/*
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* Copyright (c) 2022 The WebRTC project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef MODULES_AUDIO_PROCESSING_AGC2_SPEECH_PROBABILITY_BUFFER_H_
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#define MODULES_AUDIO_PROCESSING_AGC2_SPEECH_PROBABILITY_BUFFER_H_
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#include <vector>
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#include "rtc_base/gtest_prod_util.h"
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namespace webrtc {
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// This class implements a circular buffer that stores speech probabilities
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// for a speech segment and estimates speech activity for that segment.
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class SpeechProbabilityBuffer {
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public:
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// Ctor. The value of `low_probability_threshold` is required to be on the
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// range [0.0f, 1.0f].
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explicit SpeechProbabilityBuffer(float low_probability_threshold);
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~SpeechProbabilityBuffer() {}
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SpeechProbabilityBuffer(const SpeechProbabilityBuffer&) = delete;
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SpeechProbabilityBuffer& operator=(const SpeechProbabilityBuffer&) = delete;
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// Adds `probability` in the buffer and computes an updatds sum of the buffer
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// probabilities. Value of `probability` is required to be on the range
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// [0.0f, 1.0f].
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void Update(float probability);
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// Resets the histogram, forgets the past.
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void Reset();
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// Returns true if the segment is active (a long enough segment with an
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// average speech probability above `low_probability_threshold`).
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bool IsActiveSegment() const;
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private:
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void RemoveTransient();
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// Use only for testing.
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float GetSumProbabilities() const { return sum_probabilities_; }
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FRIEND_TEST_ALL_PREFIXES(SpeechProbabilityBufferTest,
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CheckSumAfterInitialization);
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FRIEND_TEST_ALL_PREFIXES(SpeechProbabilityBufferTest, CheckSumAfterUpdate);
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FRIEND_TEST_ALL_PREFIXES(SpeechProbabilityBufferTest, CheckSumAfterReset);
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FRIEND_TEST_ALL_PREFIXES(SpeechProbabilityBufferTest,
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CheckSumAfterTransientNotRemoved);
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FRIEND_TEST_ALL_PREFIXES(SpeechProbabilityBufferTest,
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CheckSumAfterTransientRemoved);
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const float low_probability_threshold_;
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// Sum of probabilities stored in `probabilities_`. Must be updated if
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// `probabilities_` is updated.
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float sum_probabilities_ = 0.0f;
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// Circular buffer for probabilities.
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std::vector<float> probabilities_;
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// Current index of the circular buffer, where the newest data will be written
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// to, therefore, pointing to the oldest data if buffer is full.
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int buffer_index_ = 0;
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// Indicates if the buffer is full and adding a new value removes the oldest
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// value.
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int buffer_is_full_ = false;
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int num_high_probability_observations_ = 0;
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};
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AGC2_SPEECH_PROBABILITY_BUFFER_H_
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