BP_Core_oEmbed_Extension::filter_embed_html( string $retval )

	public function filter_embed_html( $retval ) {
		if ( false === isset( buddypress()->{$this->slug_endpoint}->embedurl_in_progress ) && ! $this->is_page() ) {
			return $retval;
		}

		$url = $this->set_permalink();

		$item_id = $this->is_page() ? $this->validate_url_to_item_id( $url ) : buddypress()->{$this->slug_endpoint}->embedid_in_progress;

		// Change 'Embedded WordPress Post' to custom title.
		$custom_title = $this->set_iframe_title( $item_id );
		if ( ! empty( $custom_title ) ) {
			$title_pos = strpos( $retval, 'title=' ) + 7;
			$title_end_pos = strpos( $retval, '"', $title_pos );

			$retval = substr_replace( $retval, esc_attr( $custom_title ), $title_pos, $title_end_pos - $title_pos );
		}

		// Add 'max-width' CSS attribute to IFRAME.
		// This will make our oEmbeds responsive.
		if ( false === strpos( $retval, 'style="max-width' ) ) {
			$retval = str_replace( '<iframe', '<iframe style="max-width:100%"', $retval );
		}

		// Remove default <blockquote>.
		$retval = substr( $retval, strpos( $retval, '</blockquote>' ) + 13 );

		// Set up new fallback HTML
		// @todo Maybe use KSES?
		$fallback_html = $this->set_fallback_html( $item_id );

		/**
		 * Dynamic filter to return BP oEmbed HTML.
		 *
		 * @since BuddyPress 2.6.0
		 *
		 * @var string $retval
		 */
		return apply_filters( "bp_{$this->slug_endpoint}_embed_html", $fallback_html . $retval );
	}