1 /* 2 * Copyright (c) 2014 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_COMMON_AUDIO_VAD_INCLUDE_VAD_H_ 12 #define WEBRTC_COMMON_AUDIO_VAD_INCLUDE_VAD_H_ 13 14 #include <memory> 15 16 #include "webrtc/base/checks.h" 17 #include "webrtc/common_audio/vad/include/webrtc_vad.h" 18 #include "webrtc/typedefs.h" 19 20 namespace webrtc { 21 22 class Vad { 23 public: 24 enum Aggressiveness { 25 kVadNormal = 0, 26 kVadLowBitrate = 1, 27 kVadAggressive = 2, 28 kVadVeryAggressive = 3 29 }; 30 31 enum Activity { kPassive = 0, kActive = 1, kError = -1 }; 32 33 virtual ~Vad() = default; 34 35 // Calculates a VAD decision for the given audio frame. Valid sample rates 36 // are 8000, 16000, and 32000 Hz; the number of samples must be such that the 37 // frame is 10, 20, or 30 ms long. 38 virtual Activity VoiceActivity(const int16_t* audio, 39 size_t num_samples, 40 int sample_rate_hz) = 0; 41 42 // Resets VAD state. 43 virtual void Reset() = 0; 44 }; 45 46 // Returns a Vad instance that's implemented on top of WebRtcVad. 47 std::unique_ptr<Vad> CreateVad(Vad::Aggressiveness aggressiveness); 48 49 } // namespace webrtc 50 51 #endif // WEBRTC_COMMON_AUDIO_VAD_INCLUDE_VAD_H_ 52