src/cobalt/speech/endpointer_delegate.h

/*
 * Copyright 2016 Google Inc. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef COBALT_SPEECH_ENDPOINTER_DELEGATE_H_
#define COBALT_SPEECH_ENDPOINTER_DELEGATE_H_

#include "content/browser/speech/endpointer/endpointer.h"
#include "media/base/audio_bus.h"

namespace cobalt {
namespace speech {

// Delegate of endpointer for detecting the first time sound started in one
// speech session (from start speaking to end of speaking).
class EndPointerDelegate {
 public:
  typedef ::media::ShellAudioBus ShellAudioBus;

  explicit EndPointerDelegate(int sample_rate);
  ~EndPointerDelegate();

  // Start endpointer session for sound processing.
  void Start();
  // Stop endpointer session.
  void Stop();

  // Return true if it is the first time that the sound started.
  bool IsFirstTimeSoundStarted(const ShellAudioBus& audio_bus);

 private:
  // Used for detecting sound start event.
  content::Endpointer endpointer_;
  // Used for recording the number of samples before notifying that it is the
  // first time the sound started. The |endpointer_| should be started and run
  // in the EnvironmentEstimation mode if used in noisy conditions for at least
  // 200ms before switching to UserInputMode.
  int num_samples_recorded_;

  // Record if it is the first time that the sound started.
  bool is_first_time_sound_started_;
};

}  // namespace speech
}  // namespace cobalt

#endif  // COBALT_SPEECH_ENDPOINTER_DELEGATE_H_