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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_SPEECH_SPEECH_RECOGNIZER_DELEGATE_H_
#define CHROME_BROWSER_SPEECH_SPEECH_RECOGNIZER_DELEGATE_H_
#include <stdint.h>
#include <optional>
#include <string>
#include "base/time/time.h"
#include "media/mojo/mojom/speech_recognition.mojom.h"
// Requires cleanup. See crbug.com/800374.
enum SpeechRecognizerStatus {
SPEECH_RECOGNIZER_OFF = 0,
// Ready for SpeechRecognizer::Start() to be called.
SPEECH_RECOGNIZER_READY,
// Beginning to listen for speech, but have not received any yet.
SPEECH_RECOGNIZER_RECOGNIZING,
// Sounds are being recognized.
SPEECH_RECOGNIZER_IN_SPEECH,
// There was an error.
SPEECH_RECOGNIZER_ERROR,
// Stopping speech recognition.
SPEECH_RECOGNITION_STOPPING
};
// Delegate for speech recognizer. All methods are called from the thread on
// which this delegate was constructed.
class SpeechRecognizerDelegate {
public:
// Receive a speech recognition result. |is_final| indicated whether the
// result is an intermediate or final result. If |is_final| is true, then the
// recognizer stops and no more results will be returned.
// May include word timing information in |full_result| if the speech
// recognizer is an on device speech recognizer.
virtual void OnSpeechResult(
const std::u16string& text,
bool is_final,
const std::optional<media::SpeechRecognitionResult>& full_result) = 0;
// Invoked regularly to indicate the average sound volume.
virtual void OnSpeechSoundLevelChanged(int16_t level) = 0;
// Invoked when the state of speech recognition is changed.
virtual void OnSpeechRecognitionStateChanged(
SpeechRecognizerStatus new_state) = 0;
// Invoked when the speech recognition has stopped.
virtual void OnSpeechRecognitionStopped() = 0;
// Invoked when a language identification event
// during speech recognition has been received.
virtual void OnLanguageIdentificationEvent(
media::mojom::LanguageIdentificationEventPtr event) = 0;
protected:
virtual ~SpeechRecognizerDelegate() = default;
};
#endif // CHROME_BROWSER_SPEECH_SPEECH_RECOGNIZER_DELEGATE_H_
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