An override for core Video shortcodes

This lets us display legacy shortcodes as VideoPress videos as well.

modules/videopress/shortcode.php

@@ -138,3 +138,51 @@ function videopress_add_oembed_for_parameter( $oembed_provider ) {
 }
 add_filter( 'oembed_fetch_url', 'videopress_add_oembed_for_parameter' );
 
+/**
+ * An intermediary shortcode parser for the Core `[video]` shortcode.
+ *
+ * This lets us convert legacy video embeds over to VideoPress embeds,
+ * if the video files have been uploaded and transcoded.
+ *
+ * @param $attr
+ *
+ * @return string|void
+ */
+function videopress_shortcode_override_for_core_shortcode( $raw_attr ) {
+	$attr = $raw_attr;
+	$videopress_guid = false;
+
+	if ( isset( $attr['videopress_guid'] ) ) {
+		$videopress_guid = $attr['videopress_guid'];
+	}
+
+	// If we can find a local media item from the provided url…
+	$media_id = videopress_get_attachment_id_by_url( $attr['src'] );
+	if ( $media_id ) {
+		// And that local media item has a VideoPress GUID attached to it…
+		$videopress_guid = get_post_meta( $media_id, 'videopress_guid', true );
+	}
+
+	if ( $videopress_guid ) {
+		$videopress_attr = array( $videopress_guid );
+		if ( $attr['width'] ) {
+			$videopress_attr['w'] = (int) $attr['width'];
+		}
+		if ( $attr['autoplay'] ) {
+			$videopress_attr['autoplay'] = $attr['autoplay'];
+		}
+		if ( $attr['loop'] ) {
+			$videopress_attr['loop'] = $attr['loop'];
+		}
+
+		// Then display the VideoPress version of the stored GUID!
+		return videopress_shortcode_callback( $videopress_attr );
+	}
+
+	// Nothing else caught, so fall back to the core shortcode.
+	return wp_video_shortcode( $raw_attr );
+}
+/*
+remove_shortcode( 'video' );
+add_shortcode( 'video', 'videopress_shortcode_override_for_core_shortcode' );
+*/