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| 1 /* |
| 2 * Copyright (c) 2015 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_VAD_VOICE_ACTIVITY_DETECTOR_H_ |
| 12 #define WEBRTC_MODULES_AUDIO_PROCESSING_VAD_VOICE_ACTIVITY_DETECTOR_H_ |
| 13 |
| 14 #include <vector> |
| 15 |
| 16 #include "webrtc/base/scoped_ptr.h" |
| 17 #include "webrtc/common_audio/resampler/include/resampler.h" |
| 18 #include "webrtc/modules/audio_processing/vad/vad_audio_proc.h" |
| 19 #include "webrtc/modules/audio_processing/vad/common.h" |
| 20 #include "webrtc/modules/audio_processing/vad/pitch_based_vad.h" |
| 21 #include "webrtc/modules/audio_processing/vad/standalone_vad.h" |
| 22 |
| 23 namespace webrtc { |
| 24 |
| 25 // A Voice Activity Detector (VAD) that combines the voice probability from the |
| 26 // StandaloneVad and PitchBasedVad to get a more robust estimation. |
| 27 class VoiceActivityDetector { |
| 28 public: |
| 29 VoiceActivityDetector(); |
| 30 |
| 31 // Processes each audio chunk and estimates the voice probability. The maximum |
| 32 // supported sample rate is 32kHz. |
| 33 // TODO(aluebs): Change |length| to size_t. |
| 34 void ProcessChunk(const int16_t* audio, int length, int sample_rate_hz); |
| 35 |
| 36 // Returns a vector of voice probabilities for each chunk. It can be empty for |
| 37 // some chunks, but it catches up afterwards returning multiple values at |
| 38 // once. |
| 39 const std::vector<double>& chunkwise_voice_probabilities() const { |
| 40 return chunkwise_voice_probabilities_; |
| 41 } |
| 42 |
| 43 // Returns a vector of RMS values for each chunk. It has the same length as |
| 44 // chunkwise_voice_probabilities(). |
| 45 const std::vector<double>& chunkwise_rms() const { return chunkwise_rms_; } |
| 46 |
| 47 // Returns the last voice probability, regardless of the internal |
| 48 // implementation, although it has a few chunks of delay. |
| 49 float last_voice_probability() const { return last_voice_probability_; } |
| 50 |
| 51 private: |
| 52 // TODO(aluebs): Change these to float. |
| 53 std::vector<double> chunkwise_voice_probabilities_; |
| 54 std::vector<double> chunkwise_rms_; |
| 55 |
| 56 float last_voice_probability_; |
| 57 |
| 58 Resampler resampler_; |
| 59 VadAudioProc audio_processing_; |
| 60 |
| 61 rtc::scoped_ptr<StandaloneVad> standalone_vad_; |
| 62 PitchBasedVad pitch_based_vad_; |
| 63 |
| 64 int16_t resampled_[kLength10Ms]; |
| 65 AudioFeatures features_; |
| 66 }; |
| 67 |
| 68 } // namespace webrtc |
| 69 |
| 70 #endif // WEBRTC_MODULES_AUDIO_PROCESSING_VAD_VOICE_ACTIVITY_DETECTOR_H_ |
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