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This is the second CL needed to add a new `AdaptiveModeLevelEstimator` feature that makes AGC2 more robus to VAD mistakes: the level estimator discards estimation updates when too few consecutive speech frames are observed. In this CL, the `SaturationProtector` class has been replaced by a struct that define the state and two functions to change it. This is done in order to use the saturation protector state in `AdaptiveModeLevelEstimator::State` and will allow to add a temporary state in `AdaptiveModeLevelEstimator` (see the child CL). Tested: Bit-exactness verified with audioproc_f Bug: webrtc:7494 Change-Id: Ic5ecd1e174010656ed20664ef7b7e5798ebb7978 Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/185041 Commit-Queue: Alessio Bazzica <alessiob@webrtc.org> Reviewed-by: Karl Wiberg <kwiberg@webrtc.org> Cr-Commit-Position: refs/heads/master@{#32226}
82 lines
2.9 KiB
C++
82 lines
2.9 KiB
C++
/*
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* Copyright (c) 2018 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_SATURATION_PROTECTOR_H_
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#define MODULES_AUDIO_PROCESSING_AGC2_SATURATION_PROTECTOR_H_
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#include <array>
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#include "absl/types/optional.h"
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#include "modules/audio_processing/agc2/agc2_common.h"
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#include "rtc_base/numerics/safe_compare.h"
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namespace webrtc {
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namespace saturation_protector_impl {
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// Ring buffer which only supports (i) push back and (ii) read oldest item.
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class RingBuffer {
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public:
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bool operator==(const RingBuffer& b) const;
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inline bool operator!=(const RingBuffer& b) const { return !(*this == b); }
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// Maximum number of values that the buffer can contain.
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int Capacity() const { return buffer_.size(); }
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// Number of values in the buffer.
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int Size() const { return size_; }
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void Reset();
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// Pushes back `v`. If the buffer is full, the oldest value is replaced.
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void PushBack(float v);
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// Returns the oldest item in the buffer. Returns an empty value if the
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// buffer is empty.
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absl::optional<float> Front() const;
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private:
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inline int FrontIndex() const {
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return rtc::SafeEq(size_, buffer_.size()) ? next_ : 0;
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}
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// `buffer_` has `size_` elements (up to the size of `buffer_`) and `next_` is
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// the position where the next new value is written in `buffer_`.
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std::array<float, kPeakEnveloperBufferSize> buffer_;
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int next_ = 0;
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int size_ = 0;
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};
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} // namespace saturation_protector_impl
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// Saturation protector state. Exposed publicly for check-pointing and restore
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// ops.
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struct SaturationProtectorState {
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bool operator==(const SaturationProtectorState& s) const;
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inline bool operator!=(const SaturationProtectorState& s) const {
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return !(*this == s);
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}
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float margin_db; // Recommended margin.
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saturation_protector_impl::RingBuffer peak_delay_buffer;
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float max_peaks_dbfs;
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int time_since_push_ms; // Time since the last ring buffer push operation.
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};
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// Resets the saturation protector state.
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void ResetSaturationProtectorState(float initial_margin_db,
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SaturationProtectorState& state);
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// Updates `state` by analyzing the estimated speech level `speech_level_dbfs`
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// and the peak power `speech_peak_dbfs` for an observed frame which is
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// reliably classified as "speech". `state` must not be modified without calling
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// this function.
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void UpdateSaturationProtectorState(float speech_peak_dbfs,
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float speech_level_dbfs,
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SaturationProtectorState& state);
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} // namespace webrtc
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#endif // MODULES_AUDIO_PROCESSING_AGC2_SATURATION_PROTECTOR_H_
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