AmpController.php

class AmpController extends Controller
{

    /**
     * @Route("/ez-amp/{objectId}", name="ez_amp")
     */

    public function viewObjectAction($objectId)
    {

        $contentService = $this->get('ezpublish.api.service.content');
        $contentTypeService = $this->get('ezpublish.api.service.contenttype');

        $contentObject = $contentService->loadContent($objectId);
        $contentType = $contentTypeService->loadContentType($contentObject->versionInfo->contentInfo->contentTypeId);

        $params = array('content' => $contentObject);

        return $this->render('amp/' . $contentType->identifier . '.html.twig', $params);

    }