/**
* Copyright (c) 2014-2017 by the respective copyright holders.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*/
package org.eclipse.smarthome.core.voice;
import java.util.Locale;
import java.util.Set;
import org.eclipse.smarthome.core.audio.AudioFormat;
import org.eclipse.smarthome.core.audio.AudioStream;
/**
* This is the interface that a keyword spotting service has to implement.
*
* @author Kelly Davis - Initial contribution and API
* @author Kai Kreuzer - Refactored to use AudioStream
*/
public interface KSService {
/**
* Returns a simple string that uniquely identifies this service
*
* @return an id that identifies this service
*/
public String getId();
/**
* Returns a localized human readable label that can be used within UIs.
*
* @param locale the locale to provide the label for
* @return a localized string to be used in UIs
*/
public String getLabel(Locale locale);
/**
* Obtain the Locales available from this KSService
*
* @return The Locales available from this service
*/
public Set<Locale> getSupportedLocales();
/**
* Obtain the audio formats supported by this KSService
*
* @return The audio formats supported by this service
*/
public Set<AudioFormat> getSupportedFormats();
/**
* This method starts the process of keyword spotting
*
* The audio data of the passed {@link AudioStream} is passed to the keyword
* spotting engine. The keyword spotting attempts to spot {@code keyword} as
* being spoken in the passed {@code Locale}. Spotted keyword is indicated by
* fired {@link KSEvent} events targeting the passed {@link KSListener}.
*
* The passed {@link AudioStream} must be of a supported {@link AudioFormat}.
* In other words a {@link AudioFormat} compatible with one returned from
* the {@code getSupportedFormats()} method.
*
* The passed {@code Locale} must be supported. That is to say it must be
* a {@code Locale} returned from the {@code getSupportedLocales()} method.
*
* The passed {@code keyword} is the keyword which should be spotted.
*
* The method is supposed to return fast, i.e. it should only start the spotting as a background process.
*
* @param ksListener Non-null {@link KSListener} that {@link KSEvent} events target
* @param audioStream The {@link AudioStream} from which keywords are spotted
* @param locale The {@code Locale} in which the target keywords are spoken
* @param keyword The keyword which to spot
* @return A {@link KSServiceHandle} used to abort keyword spotting
* @throws A {@link KSException} if any parameter is invalid or a problem occurs
*/
public KSServiceHandle spot(KSListener ksListener, AudioStream audioStream, Locale locale, String keyword)
throws KSException;
}