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/*
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License
*/
package com.android.settings.accessibility;
import android.content.Context;
import android.graphics.SurfaceTexture;
import android.media.MediaPlayer;
import android.view.Surface;
import android.view.TextureView;
import android.view.TextureView.SurfaceTextureListener;
import androidx.annotation.GuardedBy;
import androidx.annotation.RawRes;
/**
* Plays the video by {@link MediaPlayer} on {@link TextureView}, calls {@link #create(Context, int,
* TextureView)} to setup the listener for TextureView and start to play the video. Once this player
* is no longer used, call {@link #release()} so that MediaPlayer object can be released.
*/
public class VideoPlayer implements SurfaceTextureListener {
private final Context context;
private final Object mediaPlayerLock = new Object();
// Media player object can't be used after it has been released, so it will be set to null. But
// VideoPlayer is asynchronized, media player object might be paused or resumed again before
// released media player is set to null. Therefore, lock mediaPlayer and mediaPlayerState by
// mediaPlayerLock keep their states consistent.
@GuardedBy("mediaPlayerLock")
private MediaPlayer mediaPlayer;
@GuardedBy("mediaPlayerLock")
private State mediaPlayerState = State.NONE;
@RawRes
private final int videoRes;
private Surface animationSurface;
/**
* Creates a {@link MediaPlayer} for a given resource id and starts playback when the surface
* for
* a given {@link TextureView} is ready.
*/
public static VideoPlayer create(Context context, @RawRes int videoRes,
TextureView textureView) {
return new VideoPlayer(context, videoRes, textureView);
}
private VideoPlayer(Context context, @RawRes int videoRes, TextureView textureView) {
this.context = context;
this.videoRes = videoRes;
textureView.setSurfaceTextureListener(this);
}
public void pause() {
synchronized (mediaPlayerLock) {
if (mediaPlayerState == State.STARTED) {
mediaPlayerState = State.PAUSED;
mediaPlayer.pause();
}
}
}
public void resume() {
synchronized (mediaPlayerLock) {
if (mediaPlayerState == State.PAUSED) {
mediaPlayer.start();
mediaPlayerState = State.STARTED;
}
}
}
/** Release media player when it's no longer needed. */
public void release() {
synchronized (mediaPlayerLock) {
if (mediaPlayerState != State.NONE && mediaPlayerState != State.END) {
mediaPlayerState = State.END;
mediaPlayer.release();
mediaPlayer = null;
}
}
if (animationSurface != null) {
animationSurface.release();
animationSurface = null;
}
}
@Override
public void onSurfaceTextureAvailable(SurfaceTexture surface, int width, int height) {
animationSurface = new Surface(surface);
synchronized (mediaPlayerLock) {
mediaPlayer = MediaPlayer.create(context, videoRes);
mediaPlayerState = State.PREPARED;
mediaPlayer.setSurface(animationSurface);
mediaPlayer.setLooping(true);
mediaPlayer.start();
mediaPlayerState = State.STARTED;
}
}
@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture surface, int width, int height) {
}
@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture surface) {
release();
return false;
}
@Override
public void onSurfaceTextureUpdated(SurfaceTexture surface) {
}
/**
* The state of MediaPlayer object. Refer to
* https://developer.android.com/reference/android/media/MediaPlayer#StateDiagram.
*/
public enum State {
/** MediaPlayer objects has not be created. */
NONE,
/** MediaPlayer objects is created by create() method. */
PREPARED,
/** MediaPlayer is started. It can be paused by pause() method. */
STARTED,
/** MediaPlayer object is paused. Calling start() to resume it. */
PAUSED,
/**
* MediaPlayer object is stopped and cannot be started until calling prepare() or
* prepareAsync()
* methods.
*/
STOPPED,
/** MediaPlayer object is released. It cannot be used again. */
END
}
}
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