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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CONTENT_PUBLIC_BROWSER_SPEECH_RECOGNITION_MANAGER_H_
#define CONTENT_PUBLIC_BROWSER_SPEECH_RECOGNITION_MANAGER_H_
#include "base/string16.h"
#include "content/common/content_export.h"
namespace content {
// This is the gatekeeper for speech recognition in the browser process. It
// handles requests received from various render views and makes sure only one
// of them can use speech recognition at a time. It also sends recognition
// results and status events to the render views when required.
class SpeechRecognitionManager {
public:
// Returns the singleton instance.
CONTENT_EXPORT static SpeechRecognitionManager* GetInstance();
// Starts/restarts recognition for an existing request.
virtual void StartRecognitionForRequest(int caller_id) = 0;
// Cancels recognition for an existing request.
virtual void CancelRecognitionForRequest(int caller_id) = 0;
// Called when the user clicks outside the speech input UI causing it to close
// and possibly have speech input go to another element.
virtual void FocusLostForRequest(int caller_id) = 0;
// Returns true if the OS reports existence of audio recording devices.
virtual bool HasAudioInputDevices() = 0;
// Used to determine if something else is currently making use of audio input.
virtual bool IsCapturingAudio() = 0;
// Returns a human readable string for the model/make of the active audio
// input device for this computer.
virtual string16 GetAudioInputDeviceModel() = 0;
// Invokes the platform provided microphone settings UI in a non-blocking way,
// via the BrowserThread::FILE thread.
virtual void ShowAudioInputSettings() = 0;
protected:
virtual ~SpeechRecognitionManager() {}
};
} // namespace content
#endif // CONTENT_PUBLIC_BROWSER_SPEECH_RECOGNITION_MANAGER_H_
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