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| 1 /* |
| 2 * Copyright (c) 2017 The WebRTC project authors. All Rights Reserved. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license |
| 5 * that can be found in the LICENSE file in the root of the source |
| 6 * tree. An additional intellectual property rights grant can be found |
| 7 * in the file PATENTS. All contributing project authors may |
| 8 * be found in the AUTHORS file in the root of the source tree. |
| 9 */ |
| 10 |
| 11 #ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_RENDER_SIGNAL_ANALYZER_H_ |
| 12 #define WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_RENDER_SIGNAL_ANALYZER_H_ |
| 13 |
| 14 #include <array> |
| 15 #include <memory> |
| 16 |
| 17 #include "webrtc/base/constructormagic.h" |
| 18 #include "webrtc/base/optional.h" |
| 19 #include "webrtc/modules/audio_processing/aec3/aec3_common.h" |
| 20 #include "webrtc/modules/audio_processing/aec3/fft_buffer.h" |
| 21 |
| 22 namespace webrtc { |
| 23 |
| 24 // Provides functionality for analyzing the properties of the render signal. |
| 25 class RenderSignalAnalyzer { |
| 26 public: |
| 27 RenderSignalAnalyzer(); |
| 28 ~RenderSignalAnalyzer(); |
| 29 |
| 30 // Updates the render signal analysis with the most recent render signal. |
| 31 void Update(const FftBuffer& X_buffer, |
| 32 const rtc::Optional<size_t>& delay_partitions); |
| 33 |
| 34 // Returns true if the render signal is poorly exciting. |
| 35 bool PoorSignalExcitation() const { |
| 36 RTC_DCHECK_LT(2, narrow_band_counters_.size()); |
| 37 return std::any_of(narrow_band_counters_.begin(), |
| 38 narrow_band_counters_.end(), |
| 39 [](size_t a) { return a > 10; }); |
| 40 } |
| 41 |
| 42 // Zeros the array around regions with narrow bands signal characteristics. |
| 43 void MaskRegionsAroundNarrowBands( |
| 44 std::array<float, kFftLengthBy2Plus1>* v) const; |
| 45 |
| 46 private: |
| 47 std::array<size_t, kFftLengthBy2 - 1> narrow_band_counters_; |
| 48 |
| 49 RTC_DISALLOW_COPY_AND_ASSIGN(RenderSignalAnalyzer); |
| 50 }; |
| 51 |
| 52 } // namespace webrtc |
| 53 |
| 54 #endif // WEBRTC_MODULES_AUDIO_PROCESSING_AEC3_RENDER_SIGNAL_ANALYZER_H_ |
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