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// Copyright 2016 The Cobalt Authors. 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 "cobalt/media/base/audio_bus.h"
#include "content/browser/speech/endpointer/endpointer.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::AudioBus AudioBus;
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 AudioBus& 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_