Android Open Source - google-media-framework-android Video Surface View

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License

The source code is released under:

Apache License

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Java Source Code

/**
 Copyright 2014 Google Inc. All rights reserved.
/*from   w  w  w  . j  a va  2  s  . c o  m*/
 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.google.android.libraries.mediaframework.layeredvideo;

import android.content.Context;
import android.util.AttributeSet;
import android.view.SurfaceView;

/**
 * A SurfaceView implementation that resizes itself according to a specified aspect ratio.
 */
public class VideoSurfaceView extends SurfaceView {

  /**
   * The surface view will not resize itself if the fractional difference
   * between its default aspect ratio and the aspect ratio of the video falls
   * below this threshold.
   */
  private static final float MAX_ASPECT_RATIO_DEFORMATION_PERCENT = 0.01f;

  /**
   * The ratio of the width and height of the video.
   */
  private float videoAspectRatio;

  /**
   * @param context The context (ex {@link android.app.Activity}) that created this object.
   */
  public VideoSurfaceView(Context context) {
    super(context);
  }

  /**
   * @param context The context (ex {@link android.app.Activity}) that created this object.
   * @param attrs A set of attributes to configure the {@link android.view.SurfaceView}.
   */
  public VideoSurfaceView(Context context, AttributeSet attrs) {
    super(context, attrs);
  }

  /**
   * Resize the view based on the width and height specifications.
   * @param widthMeasureSpec The specified width.
   * @param heightMeasureSpec The specified height.
   */
  @Override
  protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    int width = getMeasuredWidth();
    int height = getMeasuredHeight();
    if (videoAspectRatio != 0) {
      float viewAspectRatio = (float) width / height;
      float aspectDeformation = videoAspectRatio / viewAspectRatio - 1;
      if (aspectDeformation > MAX_ASPECT_RATIO_DEFORMATION_PERCENT) {
        height = (int) (width / videoAspectRatio);
      } else if (aspectDeformation < -MAX_ASPECT_RATIO_DEFORMATION_PERCENT) {
        width = (int) (height * videoAspectRatio);
      }
    }
    setMeasuredDimension(width, height);
  }

  /**
   * Set the aspect ratio that this {@link VideoSurfaceView} should satisfy.
   *
   * @param widthHeightRatio The width to height ratio.
   */
  public void setVideoWidthHeightRatio(float widthHeightRatio) {
    if (this.videoAspectRatio != widthHeightRatio) {
      this.videoAspectRatio = widthHeightRatio;
      requestLayout();
    }
  }

}

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