70 lines
2.3 KiB
C
70 lines
2.3 KiB
C
|
/*
|
||
|
|
* 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 MODULES_AUDIO_PROCESSING_AGC_STANDALONE_VAD_H_
|
||
|
|
#define MODULES_AUDIO_PROCESSING_AGC_STANDALONE_VAD_H_
|
||
|
|
|
||
|
|
#include <stddef.h>
|
||
|
|
#include <stdint.h>
|
||
|
|
|
||
|
|
#include "common_audio/vad/include/webrtc_vad.h"
|
||
|
|
#include "modules/audio_processing/vad/common.h"
|
||
|
|
|
||
|
|
namespace webrtc {
|
||
|
|
|
||
|
|
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, size_t length_p);
|
||
|
|
|
||
|
|
// Expecting 10 ms of 16 kHz audio to be pushed in.
|
||
|
|
int AddAudio(const int16_t* data, size_t 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 size_t kMaxNum10msFrames = 3;
|
||
|
|
|
||
|
|
// TODO(turajs): Is there a way to use scoped-pointer here?
|
||
|
|
VadInst* vad_;
|
||
|
|
int16_t buffer_[kMaxNum10msFrames * kLength10Ms];
|
||
|
|
size_t index_;
|
||
|
|
int mode_;
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace webrtc
|
||
|
|
|
||
|
|
#endif // MODULES_AUDIO_PROCESSING_AGC_STANDALONE_VAD_H_
|