content: /*
   * Copyright (C) 2018 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.google.android.exoplayer2.video;
  
  /** A listener for metadata corresponding to video being rendered. */
  public interface VideoListener {
  
    /**
     * Called each time there's a change in the size of the video being rendered.
     *
     * @param width The video width in pixels.
     * @param height The video height in pixels.
     * @param unappliedRotationDegrees For videos that require a rotation, this is the clockwise
     *     rotation in degrees that the application should apply for the video for it to be rendered
     *     in the correct orientation. This value will always be zero on API levels 21 and above,
     *     since the renderer will apply all necessary rotations internally. On earlier API levels
     *     this is not possible. Applications that use {@link android.view.TextureView} can apply the
     *     rotation by calling {@link android.view.TextureView#setTransform}. Applications that do not
     *     expect to encounter rotated videos can safely ignore this parameter.
     * @param pixelWidthHeightRatio The width to height ratio of each pixel. For the normal case of
     *     square pixels this will be equal to 1.0. Different values are indicative of anamorphic
     *     content.
     */
    void onVideoSizeChanged(
        int width, int height, int unappliedRotationDegrees, float pixelWidthHeightRatio);
  
    /**
     * Called when a frame is rendered for the first time since setting the surface, and when a frame
     * is rendered for the first time since a video track was selected.
     */
    void onRenderedFirstFrame();
  }
  