vad.h (1427B)
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 COMMON_AUDIO_VAD_INCLUDE_VAD_H_ 12 #define COMMON_AUDIO_VAD_INCLUDE_VAD_H_ 13 14 #include <cstddef> 15 #include <cstdint> 16 #include <memory> 17 18 19 namespace webrtc { 20 21 class Vad { 22 public: 23 enum Aggressiveness { 24 kVadNormal = 0, 25 kVadLowBitrate = 1, 26 kVadAggressive = 2, 27 kVadVeryAggressive = 3 28 }; 29 30 enum Activity { kPassive = 0, kActive = 1, kError = -1 }; 31 32 virtual ~Vad() = default; 33 34 // Calculates a VAD decision for the given audio frame. Valid sample rates 35 // are 8000, 16000, and 32000 Hz; the number of samples must be such that the 36 // frame is 10, 20, or 30 ms long. 37 virtual Activity VoiceActivity(const int16_t* audio, 38 size_t num_samples, 39 int sample_rate_hz) = 0; 40 41 // Resets VAD state. 42 virtual void Reset() = 0; 43 }; 44 45 // Returns a Vad instance that's implemented on top of WebRtcVad. 46 std::unique_ptr<Vad> CreateVad(Vad::Aggressiveness aggressiveness); 47 48 } // namespace webrtc 49 50 #endif // COMMON_AUDIO_VAD_INCLUDE_VAD_H_