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/*
* 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_MIC_H_
#define COBALT_SPEECH_MIC_H_
#include <string>
#include "base/callback.h"
#include "media/base/audio_bus.h"
namespace cobalt {
namespace speech {
// An abstract class is used for interacting platform specific microphone.
class Mic {
public:
typedef ::media::AudioBus AudioBus;
typedef base::Callback<void(scoped_ptr<AudioBus>)> DataReceivedCallback;
typedef base::Callback<void(void)> CompletionCallback;
typedef base::Callback<void(void)> ErrorCallback;
virtual ~Mic() {}
static scoped_ptr<Mic> Create(int sample_rate,
const DataReceivedCallback& data_received,
const CompletionCallback& completion,
const ErrorCallback& error);
// Multiple calls to Start/Stop are allowed, the implementation should take
// care of multiple calls. The Start/Stop methods are required to be called in
// the same thread.
// Start microphone to receive voice.
virtual void Start() = 0;
// Stop microphone from receiving voice.
virtual void Stop() = 0;
protected:
Mic(int sample_rate, const DataReceivedCallback& data_received,
const CompletionCallback& completion, const ErrorCallback& error)
: sample_rate_(sample_rate),
data_received_callback_(data_received),
completion_callback_(completion),
error_callback_(error) {}
int sample_rate_;
const DataReceivedCallback data_received_callback_;
const CompletionCallback completion_callback_;
const ErrorCallback error_callback_;
};
std::string GetSpeechAPIKey();
} // namespace speech
} // namespace cobalt
#endif // COBALT_SPEECH_MIC_H_