Revert "Pull the Voice Activity Detector out from the AGC"

webrtc/modules/audio_processing/vad/standalone_vad.h

-/*
- *  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_