new plugin: YouTube Preview Image Resolution

wp-rocket-lazyload-youtube-preview-image/README.md

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+# WP Rocket | YouTube Preview Image Resolution
+
+Customizes the resolution of the YouTube preview image for videos.
+
+📝 **Manual code edit required before use!**
+
+Before you activate the plugin, replace the placeholder value `hqdefault` in line 22 with the resolution keyword you would like to use.
+
+Documentation:
+* [Choose YouTube Preview Image Resolution](http://docs.wp-rocket.me/article/1062-choose-youtube-preview-image-resolution)
+
+To be used with:
+* any setup where LazyLoad and the YouTube preview image is enabled
+
+Last tested with:
+* WP Rocket 2.11.5
+* WordPress 4.9.x

wp-rocket-lazyload-youtube-preview-image/wp-rocket-lazyload-youtube-preview-image.php

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+<?php
+/**
+ * Plugin Name: WP Rocket | YouTube Preview Image Resolution
+ * Description: Customizes the resolution of the YouTube preview image for videos.
+ * Plugin URI:  https://github.com/wp-media/wp-rocket-helpers/tree/master/wp-rocket-lazyload-youtube-preview-image/
+ * Author:      WP Rocket Support Team
+ * Author URI:  http://wp-rocket.me/
+ * License:     GNU General Public License v2 or later
+ * License URI: http://www.gnu.org/licenses/gpl-2.0.html
+ *
+ * Copyright SAS WP MEDIA 2018
+ */
+
+// Standard plugin security, keep this line in place.
+defined( 'ABSPATH' ) or die();
+
+namespace WP_Rocket\Helpers\lazyload\youtube_preview_image;
+
+// EDIT THIS:
+// Possibles values: default, mqdefault, sddefault, hqdefault, maxresdefault
+
+define( 'WPROCKETHELPERS_LL_YT_PREVIEW_RESOLUTION', 'hqdefault' );
+
+// STOP EDITING
+
+/**
+ * Customise YouTube preview image resolution.
+ *
+ * @author Remy Perona
+ * @param  string $thumbnail_resolution Predefined keyword for preview image resolution, default: hqdefault
+ *                                      Possibles values: default, mqdefault, sddefault, hqdefault, maxresdefault
+ * @return string                       Maybe modfied resolution keyword
+ */
+function resolution( $thumbnail_resolution ) {
+
+	return WPROCKETHELPERS_LL_YT_PREVIEW_RESOLUTION;
+}
+add_filter( 'rocket_youtube_thumbnail_resolution', __NAMESPACE__ . '\resolution' );