ExoPlayer + GLTextureView

GLVideoTextureView.kt

import android.content.Context
import android.graphics.Matrix
import android.util.AttributeSet
import com.google.android.apps.muzei.render.GLTextureView
import com.google.android.exoplayer2.SimpleExoPlayer
import timber.log.Timber

class GLVideoTextureView @JvmOverloads constructor(
    context: Context, attrs: AttributeSet? = null
) : GLTextureView(context, attrs), SimpleExoPlayer.VideoListener {

  init {
    setEGLContextClientVersion(2)
  }

  override fun onRenderedFirstFrame() {
    // do nothing
  }

  override fun onVideoSizeChanged(width: Int, height: Int, unappliedRotationDegrees: Int, pixelWidthHeightRatio: Float) {
    // Android 4.4なSO-03Fなどでは、portraitで撮影した映像とExoPlayerを介してレンダリングされる映像の回転が一致しないので対策する
    // @see: https://github.com/google/ExoPlayer/issues/91#issuecomment-158106485
    Timber.d("onVideoSizeChanged: $width, $height, $unappliedRotationDegrees, $pixelWidthHeightRatio")

    val viewWidth = getWidth()
    val viewHeight = getHeight()

    val pivotX = viewWidth / 2F
    val pivotY = viewHeight / 2F

    setTransform(Matrix().apply {
      postRotate(unappliedRotationDegrees.toFloat(), pivotX, pivotY)
      if (unappliedRotationDegrees == 90 || unappliedRotationDegrees == 270) {
        val viewAspectRatio = viewHeight / viewWidth.toFloat()
        postScale(1 / viewAspectRatio, viewAspectRatio, pivotX, pivotY)
      }
    })
  }

}