Gallery.php

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<?php
namespace Magento\ProductVideo\Block\Product\View;

class Gallery extends \Magento\Catalog\Block\Product\View\Gallery
{
    protected $mediaHelper;

    public function __construct(
        \Magento\Catalog\Block\Product\Context $context,
        \Magento\Framework\Stdlib\ArrayUtils $arrayUtils,
        \Magento\Framework\Json\EncoderInterface $jsonEncoder,
        \Magento\ProductVideo\Helper\Media $mediaHelper,
        array $data = [],
        \Magento\Catalog\Model\Product\Gallery\ImagesConfigFactoryInterface $imagesConfigFactory = null,
        array $galleryImagesConfig = []
    ) {
        parent::__construct(
            $context,
            $arrayUtils,
            $jsonEncoder,
            $data,
            $imagesConfigFactory,
            $galleryImagesConfig
        );
        $this->mediaHelper = $mediaHelper;
    }

    public function getMediaGalleryDataJson()
    {
        $mediaGalleryData = [];
        foreach ($this->getProduct()->getMediaGalleryImages() as $mediaGalleryImage) {
            $mediaGalleryData[] = [
                'mediaType' => $mediaGalleryImage->getMediaType(),
                'videoUrl' => $mediaGalleryImage->getVideoUrl(),
                'isBase' => $this->isMainImage($mediaGalleryImage),
            ];
        }
        return $this->jsonEncoder->encode($mediaGalleryData);
    }

    public function getVideoSettingsJson()
    {
        $videoSettingData[] = [
            'playIfBase' => $this->mediaHelper->getPlayIfBaseAttribute(),
            'showRelated' => $this->mediaHelper->getShowRelatedAttribute(),
            'videoAutoRestart' => $this->mediaHelper->getVideoAutoRestartAttribute(),
        ];
        return $this->jsonEncoder->encode($videoSettingData);
    }

    public function getOptionsMediaGalleryDataJson()
    {
        return $this->jsonEncoder->encode([]);
    }
}