/*
 *  Copyright (c) 2013 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_CODING_NETEQ4_POST_DECODE_VAD_H_
#define WEBRTC_MODULES_AUDIO_CODING_NETEQ4_POST_DECODE_VAD_H_

#include <string>  // size_t

#include "webrtc/common_audio/vad/include/webrtc_vad.h"
#include "webrtc/common_types.h"  // NULL
#include "webrtc/modules/audio_coding/neteq4/defines.h"
#include "webrtc/modules/audio_coding/neteq4/interface/audio_decoder.h"
#include "webrtc/modules/audio_coding/neteq4/packet.h"
#include "webrtc/system_wrappers/interface/constructor_magic.h"
#include "webrtc/typedefs.h"

namespace webrtc {

class PostDecodeVad {
 public:
  PostDecodeVad()
      : enabled_(false),
        running_(false),
        active_speech_(true),
        sid_interval_counter_(0),
        vad_instance_(NULL) {
  }

  virtual ~PostDecodeVad() {
    if (vad_instance_) {
      WebRtcVad_Free(vad_instance_);
    }
  }

  // Enables post-decode VAD.
  void Enable();

  // Disables post-decode VAD.
  void Disable();

  // Initializes post-decode VAD.
  void Init();

  // Updates post-decode VAD with the audio data in |signal| having |length|
  // samples. The data is of type |speech_type|, at the sample rate |fs_hz|.
  void Update(int16_t* signal, size_t length,
              AudioDecoder::SpeechType speech_type, bool sid_frame, int fs_hz);

  // Accessors.
  bool enabled() const { return enabled_; }
  bool running() const { return running_; }
  bool active_speech() const { return active_speech_; }

 private:
  static const int kVadMode = 0;  // Sets aggressiveness to "Normal".
  // Number of Update() calls without CNG/SID before re-enabling VAD.
  static const int kVadAutoEnable = 3000;

  bool enabled_;
  bool running_;
  bool active_speech_;
  int sid_interval_counter_;
  ::VadInst* vad_instance_;

  DISALLOW_COPY_AND_ASSIGN(PostDecodeVad);
};

}  // namespace webrtc
#endif  // WEBRTC_MODULES_AUDIO_CODING_NETEQ4_POST_DECODE_VAD_H_