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77 lines
2.7 KiB
Java
77 lines
2.7 KiB
Java
/*
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* Copyright (C) 2014 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.google.android.exoplayer;
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import android.content.Context;
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import android.util.AttributeSet;
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import android.view.SurfaceView;
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/**
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* A SurfaceView that resizes itself to match a specified aspect ratio.
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*/
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public class VideoSurfaceView extends SurfaceView {
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/**
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* The surface view will not resize itself if the fractional difference between its default
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* aspect ratio and the aspect ratio of the video falls below this threshold.
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* <p>
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* This tolerance is useful for fullscreen playbacks, since it ensures that the surface will
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* occupy the whole of the screen when playing content that has the same (or virtually the same)
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* aspect ratio as the device. This typically reduces the number of view layers that need to be
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* composited by the underlying system, which can help to reduce power consumption.
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*/
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private static final float MAX_ASPECT_RATIO_DEFORMATION_PERCENT = 0.01f;
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private float videoAspectRatio;
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public VideoSurfaceView(Context context) {
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super(context);
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}
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public VideoSurfaceView(Context context, AttributeSet attrs) {
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super(context, attrs);
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}
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/**
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* Set the aspect ratio that this {@link VideoSurfaceView} should satisfy.
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*
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* @param widthHeightRatio The width to height ratio.
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*/
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public void setVideoWidthHeightRatio(float widthHeightRatio) {
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if (this.videoAspectRatio != widthHeightRatio) {
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this.videoAspectRatio = widthHeightRatio;
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requestLayout();
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}
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}
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@Override
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protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
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super.onMeasure(widthMeasureSpec, heightMeasureSpec);
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int width = getMeasuredWidth();
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int height = getMeasuredHeight();
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if (videoAspectRatio != 0) {
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float viewAspectRatio = (float) width / height;
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float aspectDeformation = videoAspectRatio / viewAspectRatio - 1;
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if (aspectDeformation > MAX_ASPECT_RATIO_DEFORMATION_PERCENT) {
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height = (int) (width / videoAspectRatio);
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} else if (aspectDeformation < -MAX_ASPECT_RATIO_DEFORMATION_PERCENT) {
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width = (int) (height * videoAspectRatio);
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}
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}
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setMeasuredDimension(width, height);
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}
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}
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