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/*
* Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_AGC_STANDALONE_VAD_H_
#define WEBRTC_MODULES_AUDIO_PROCESSING_AGC_STANDALONE_VAD_H_
#include "webrtc/base/scoped_ptr.h"
#include "webrtc/modules/audio_processing/vad/common.h"
#include "webrtc/common_audio/vad/include/webrtc_vad.h"
#include "webrtc/typedefs.h"
namespace webrtc {
class AudioFrame;
class StandaloneVad {
public:
static StandaloneVad* Create();
~StandaloneVad();
// Outputs
// p: a buffer where probabilities are written to.
// length_p: number of elements of |p|.
//
// return value:
// -1: if no audio is stored or VAD returns error.
// 0: in success.
// In case of error the content of |activity| is unchanged.
//
// Note that due to a high false-positive (VAD decision is active while the
// processed audio is just background noise) rate, stand-alone VAD is used as
// a one-sided indicator. The activity probability is 0.5 if the frame is
// classified as active, and the probability is 0.01 if the audio is
// classified as passive. In this way, when probabilities are combined, the
// effect of the stand-alone VAD is neutral if the input is classified as
// active.
int GetActivity(double* p, int length_p);
// Expecting 10 ms of 16 kHz audio to be pushed in.
int AddAudio(const int16_t* data, int length);
// Set aggressiveness of VAD, 0 is the least aggressive and 3 is the most
// aggressive mode. Returns -1 if the input is less than 0 or larger than 3,
// otherwise 0 is returned.
int set_mode(int mode);
// Get the agressiveness of the current VAD.
int mode() const { return mode_; }
private:
explicit StandaloneVad(VadInst* vad);
static const int kMaxNum10msFrames = 3;
// TODO(turajs): Is there a way to use scoped-pointer here?
VadInst* vad_;
int16_t buffer_[kMaxNum10msFrames * kLength10Ms];
int index_;
int mode_;
};
} // namespace webrtc
#endif // WEBRTC_MODULES_AUDIO_PROCESSING_AGC_STANDALONE_VAD_H_