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