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PhabricatorVideoDocumentEngine.php
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			<?php

			final class PhabricatorVideoDocumentEngine
			extends PhabricatorDocumentEngine {

			const ENGINEKEY = 'video';

			public function getViewAsLabel(PhabricatorDocumentRef $ref) {
			return pht('View as Video');
			}

			protected function getContentScore(PhabricatorDocumentRef $ref) {
			// Some video documents can be rendered as either video or audio, but we
			// want to prefer video.
			return 2500;
			}

			protected function getByteLengthLimit() {
			return null;
			}

			protected function getDocumentIconIcon(PhabricatorDocumentRef $ref) {
			return 'fa-film';
			}

			protected function canRenderDocumentType(PhabricatorDocumentRef $ref) {
			$file = $ref->getFile();
			if ($file) {
			return $file->isVideo();
			}

			$viewable_types = PhabricatorEnv::getEnvConfig('files.viewable-mime-types');
			$viewable_types = array_keys($viewable_types);

			$video_types = PhabricatorEnv::getEnvConfig('files.video-mime-types');
			$video_types = array_keys($video_types);

			return
			$ref->hasAnyMimeType($viewable_types) &&
			$ref->hasAnyMimeType($video_types);
			}

			protected function newDocumentContent(PhabricatorDocumentRef $ref) {
			$file = $ref->getFile();
			if ($file) {
			$source_uri = $file->getViewURI();
			} else {
			throw new PhutilMethodNotImplementedException();
			}

			$mime_type = $ref->getMimeType();

			$video = phutil_tag(
			'video',
			array(
			'controls' => 'controls',
			),
			phutil_tag(
			'source',
			array(
			'src' => $source_uri,
			'type' => $mime_type,
			)));

			$container = phutil_tag(
			'div',
			array(
			'class' => 'document-engine-video',
			),
			$video);

			return $container;
			}

			}