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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_RECOGNIZER_DELEGATE_H_
#define CONTENT_PUBLIC_BROWSER_SPEECH_RECOGNIZER_DELEGATE_H_
#pragma once
#include "content/public/common/speech_recognition_result.h"
namespace content {
// An interface to be implemented by consumers interested in receiving
// recognition events.
class SpeechRecognizerDelegate {
public:
virtual void SetRecognitionResult(int caller_id,
const SpeechRecognitionResult& result) = 0;
// Invoked when the first audio packet was received from the audio capture
// device.
virtual void DidStartReceivingAudio(int caller_id) = 0;
// Invoked when audio recording stops, either due to the end pointer
// detecting silence in user input or if |StopRecording| was called. The
// delegate has to wait until |DidCompleteRecognition| is invoked before
// destroying the |SpeechRecognizer| object.
virtual void DidCompleteRecording(int caller_id) = 0;
// This is guaranteed to be the last method invoked in the recognition
// sequence and the |SpeechRecognizer| object can be freed up if necessary.
virtual void DidCompleteRecognition(int caller_id) = 0;
// Informs that the end pointer has started detecting speech.
virtual void DidStartReceivingSpeech(int caller_id) = 0;
// Informs that the end pointer has stopped detecting speech.
virtual void DidStopReceivingSpeech(int caller_id) = 0;
// Invoked if there was an error while recording or recognizing audio. The
// session has already been cancelled when this call is made and the DidXxxx
// callbacks will not be issued. It is safe to destroy/release the
// |SpeechRecognizer| object while processing this call.
virtual void OnRecognizerError(int caller_id,
SpeechRecognitionErrorCode error) = 0;
// At the start of recognition, a short amount of audio is recorded to
// estimate the environment/background noise and this callback is issued
// after that is complete. Typically the delegate brings up any speech
// recognition UI once this callback is received.
virtual void DidCompleteEnvironmentEstimation(int caller_id) = 0;
// Informs of a change in the captured audio level, useful if displaying
// a microphone volume indicator while recording.
// The value of |volume| and |noise_volume| is in the [0.0, 1.0] range.
virtual void SetInputVolume(int caller_id,
float volume,
float noise_volume) = 0;
protected:
virtual ~SpeechRecognizerDelegate() {}
};
} // namespace content
#endif // CONTENT_PUBLIC_BROWSER_SPEECH_RECOGNIZER_DELEGATE_H_
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