src/starboard/android/apk/app/src/main/java/dev/cobalt/media/VideoSurfaceView.java

// Copyright 2017 The Cobalt Authors. All Rights Reserved.
//
// 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 dev.cobalt.media;

import static dev.cobalt.media.Log.TAG;

import android.content.Context;
import android.graphics.Color;
import android.graphics.Rect;
import android.util.AttributeSet;
import android.view.Surface;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import dev.cobalt.util.Log;

/**
 * A Surface view to be used by the video decoder. It informs the Starboard application when the
 * surface is available so that the decoder can get a reference to it.
 */
public class VideoSurfaceView extends SurfaceView {

  public static native void nativeOnLayoutNeeded();

  public static native void nativeOnLayoutScheduled();

  public static native void nativeOnGlobalLayout();

  private Rect videoBounds;

  public VideoSurfaceView(Context context) {
    super(context);
    initialize(context);
  }

  public VideoSurfaceView(Context context, AttributeSet attrs) {
    super(context, attrs);
    initialize(context);
  }

  public VideoSurfaceView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    initialize(context);
  }

  public VideoSurfaceView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
    super(context, attrs, defStyleAttr, defStyleRes);
    initialize(context);
  }

  private void initialize(Context context) {
    videoBounds = new Rect();
    setBackgroundColor(Color.TRANSPARENT);
    getHolder().addCallback(new SurfaceHolderCallback());

    // TODO: Avoid recreating the surface when the player bounds change.
    // Recreating the surface is time-consuming and complicates synchronizing
    // punch-out video when the position / size is animated.
  }

  public boolean updateVideoBounds(final int x, final int y, final int width, final int height) {
    if (videoBounds.left != x
        || videoBounds.top != y
        || videoBounds.right != x + width
        || videoBounds.bottom != y + height) {
      videoBounds.set(x, y, x + width, y + height);
      return true;
    }
    return false;
  }

  private native void nativeOnVideoSurfaceChanged(Surface surface);

  private class SurfaceHolderCallback implements SurfaceHolder.Callback {

    boolean sawInitialChange = false;

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
      nativeOnVideoSurfaceChanged(holder.getSurface());
    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
      // We should only ever see the initial change after creation.
      if (sawInitialChange) {
        Log.e(TAG, "Video surface changed; decoding may break");
      }
      sawInitialChange = true;
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
      nativeOnVideoSurfaceChanged(null);
    }
  }
}