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package org.apidesign.html.sound.spi;

/** Basic interface for sound playback providers. Register your implementation

 * in a way {@link java.util.ServiceLoader} can find it - e.g. use

 * {@link org.openide.util.lookup.ServiceProvider} annotation.

 *

 * @author antonepple

 * @param <Audio> custom type representing the internal audio state

 */

public interface AudioEnvironment<Audio> {

    /** Checks if the provided URL can be a supported audio stream 

     * and if so, it create an object to represent it. The created object

     * will be used in future callbacks to other methods of this interface

     * (like {@link #play(java.lang.Object)}).

     * @param src the URL pointing to the media stream

     * @return an internal representation object or <code>null</code> if this

     *   environment does not know how to handle such stream

     */

    public Audio create(String src);

    /** Starts playback of the audio.

     * 

     * @param a the internal representation of the audio as created by {@link #create(java.lang.String)} method.

     */

    public void play(Audio a);

    /** Pauses playback of the audio.

     * 

     * @param a the internal representation of the audio as created by {@link #create(java.lang.String)} method.

     */

    public void pause(Audio a);

    /** Changes volume for the playback of the audio.

     * 

     * @param a the internal representation of the audio as created by {@link #create(java.lang.String)} method.

     * @param volume value between 0.0 and 1.0

     */

    public void setVolume(Audio a, double volume);

    /** Checks whether given audio is supported

     * 

     * @param a

     * @return <code>true</code> or <code>false</code>

     */

    public boolean isSupported(Audio a);

}