private void updateTextureViewSize(int ax, int ay, int bx, int by) {
    float scaleX;
    float scaleY;

    //proportions between screen and frame dimensions
    scaleX = mVideoWidth / mDisplayWidth;
    scaleY = mVideoHeight / mDisplayHeight;

    float scaleRegionW = mVideoWidth / Math.abs(ax - bx);
    float scaleRegionH = mVideoHeight / Math.abs(ay - by);
    float scaleRegion = scaleRegionW < scaleRegionH ? scaleRegionW : scaleRegionH;

    Matrix matrix = new Matrix();
    if (scaleX > scaleY) {
        matrix.setScale(scaleRegion / scaleY, scaleRegion);
        matrix.postTranslate(-ax * (int) scaleRegion / scaleY, -ay * scaleRegion / scaleY);
    } else {
        matrix.setScale(scaleRegion, scaleRegion / scaleX);
        matrix.postTranslate(-ax * scaleRegion / scaleX, -ay * scaleRegion / scaleX);
    }
    mTextureView.setTransform(matrix);
    mTextureView.setLayoutParams(new FrameLayout.LayoutParams((int) mDisplayWidth, (int) mDisplayHeight));
}