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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_MICROPHONE_MANAGER_H_
#define COBALT_SPEECH_MICROPHONE_MANAGER_H_
#include "cobalt/speech/speech_configuration.h"
#include "base/callback.h"
#include "base/optional.h"
#include "base/threading/thread.h"
#include "base/timer.h"
#include "cobalt/dom/event.h"
#include "cobalt/speech/microphone.h"
#include "media/base/shell_audio_bus.h"
namespace cobalt {
namespace speech {
// This class is used for microphone creation, control and destruction. It has
// a self-managed poller to fetch audio data from microphone.
class MicrophoneManager {
public:
typedef ::media::ShellAudioBus ShellAudioBus;
typedef base::Callback<void(scoped_ptr<ShellAudioBus>)> DataReceivedCallback;
typedef base::Callback<void(void)> CompletionCallback;
typedef base::Callback<void(const scoped_refptr<dom::Event>&)> ErrorCallback;
MicrophoneManager(int sample_rate, const DataReceivedCallback& data_received,
const CompletionCallback& completion,
const ErrorCallback& error,
const Microphone::Options& options);
~MicrophoneManager();
// Open microphone to receive voice and start a timer to fetch audio data from
// microphone.
void Open();
// Close microphone and stop the timer from receiving audio data.
void Close();
private:
enum State { kStarted, kStopped, kError };
// Returns true if the creation succeeded or the microphone is already a valid
// one.
bool CreateIfNecessary();
void OpenInternal();
void CloseInternal();
void DestroyInternal();
// Timer callback for fetching audio data.
void Read();
int sample_rate_;
const DataReceivedCallback data_received_callback_;
const CompletionCallback completion_callback_;
const ErrorCallback error_callback_;
scoped_ptr<Microphone> microphone_;
#if defined(ENABLE_FAKE_MICROPHONE)
Microphone::Options microphone_options_;
#endif // defined(ENABLE_FAKE_MICROPHONE)
// Microphone state.
State state_;
// Repeat timer to poll mic events.
base::optional<base::RepeatingTimer<MicrophoneManager> >
poll_mic_events_timer_;
// Microphone thread.
base::Thread thread_;
};
} // namespace speech
} // namespace cobalt
#endif // COBALT_SPEECH_MICROPHONE_MANAGER_H_