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;
  
  import android.media.MediaFormat;
  import androidx.annotation.Nullable;
  import com.google.android.exoplayer2.Format;
  
  /** A listener for metadata corresponding to video frames being rendered. */
  public interface VideoFrameMetadataListener {
    /**
     * Called on the playback thread when a video frame is about to be rendered.
     *
     * @param presentationTimeUs The presentation time of the frame, in microseconds.
     * @param releaseTimeNs The wallclock time at which the frame should be displayed, in nanoseconds.
     *     If the platform API version of the device is less than 21, then this is a best effort.
     * @param format The format associated with the frame.
     * @param mediaFormat The framework media format associated with the frame, or {@code null} if not
     *     known or not applicable (e.g., because the frame was not output by a {@link
     *     android.media.MediaCodec MediaCodec}).
     */
    void onVideoFrameAboutToBeRendered(
        long presentationTimeUs,
        long releaseTimeNs,
        Format format,
        @Nullable MediaFormat mediaFormat);
  }
  