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