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 "webrtc/base/checks.h"
15#include "webrtc/base/scoped_ptr.h"
16#include "webrtc/common_audio/vad/include/webrtc_vad.h"
17#include "webrtc/typedefs.h"
18
19namespace webrtc {
20
21class 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.
46rtc::scoped_ptr<Vad> CreateVad(Vad::Aggressiveness aggressiveness);
47
48}  // namespace webrtc
49
50#endif  // WEBRTC_COMMON_AUDIO_VAD_INCLUDE_VAD_H_
51