Jetpack VideoPress Shortcode

                    function videopress_embed_shortcode( $atts ) {
		/**
		 * We only accept GUIDs as a first unnamed argument.
		 */
		$guid = isset( $atts[0] ) ? $atts[0] : null;

		/**
		 * Make sure the GUID passed in matches how actual GUIDs are formatted.
		 */
		if ( ! videopress_is_valid_guid( $guid ) ) {
			return '<!-- error: missing or invalid VideoPress video ID -->';
		}

		/**
		 * Set the defaults
		 */
		$defaults = array(
			'w'               => 640,   // Width of the video player, in pixels
			'h'               => 0,     // Height of the video player, in pixels
			'at'              => 0,     // How many seconds in to initially seek to
			'loop'            => false, // Whether to loop the video repeatedly
			'autoplay'        => false, // Whether to autoplay the video on load
			'cover'           => true,  // Whether to scale the video to its container
			'muted'           => false, // Whether the video should start without sound
			'controls'        => true,  // Whether the video should display controls
			'playsinline'     => false, // Whether the video should be allowed to play inline (for browsers that support this)
			'useaveragecolor' => false, // Whether the video should use the seekbar automatic average color
			'preloadcontent'  => 'metadata',
		);

		// Make sure "false" will be actually false.
		foreach ( $atts as $key => $value ) {
			if ( is_string( $value ) && 'false' === strtolower( $value ) ) {
				$atts[ $key ] = 0;
			}
		}

		if ( isset( $atts['preload'] ) ) {
			$atts['preloadcontent'] = $atts['preload'];
		}

		$atts = shortcode_atts( $defaults, $atts, 'videopress' );

		$base_url     = 'https://videopress.com/embed/' . $guid;
		$query_params = array(
			'at'              => $atts['at'],
			'loop'            => $atts['loop'],
			'autoplay'        => $atts['autoplay'],
			'muted'           => $atts['muted'],
			'controls'        => $atts['controls'],
			'playsinline'     => $atts['playsinline'],
			'useAverageColor' => $atts['useaveragecolor'], // The casing is intentional, shortcode params are lowercase, but player expects useAverageColor
			'preloadContent'  => $atts['preloadcontent'], // The casing is intentional, shortcode params are lowercase, but player expects preloadContent
		);
		$src          = esc_url( add_query_arg( $query_params, $base_url ) );

		$width = absint( $atts['w'] );
		if ( ! $atts['h'] ) {
			$aspect_ratio = 16 / 9; // TODO: Get the correct aspect ratio for the video.
			$height       = $width / $aspect_ratio;
		} else {
			$height = absint( $atts['h'] );
		}

		$cover = $atts['cover'] ? ' data-resize-to-parent="true"' : '';

		$block_template =
		'<figure class="wp-block-videopress-video wp-block-jetpack-videopress jetpack-videopress-player">' .
			'<div class="jetpack-videopress-player__wrapper">' .
				'<iframe ' .
					'title="' . __( 'VideoPress Video Player', 'jetpack-videopress-pkg' ) . '" ' .
					'aria-label="' . __( 'VideoPress Video Player', 'jetpack-videopress-pkg' ) . '" ' .
					'src="%s" ' .
					'width="%s"' .
					'height="%s" ' .
					'frameborder="0" ' .
					'allowfullscreen%s allow="clipboard-write">' .
				'</iframe>' .
			'</div>' .
		'</figure>';

		$version = Package_Version::PACKAGE_VERSION;
		wp_enqueue_script( 'videopress-iframe', 'https://videopress.com/videopress-iframe.js', array(), $version, true );

		return sprintf( $block_template, $src, $width, $height, $cover );
	}