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PhabricatorAudioDocumentEngine.php
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			<?php

			final class PhabricatorAudioDocumentEngine
			extends PhabricatorDocumentEngine {

			const ENGINEKEY = 'audio';

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

			protected function getDocumentIconIcon(PhabricatorDocumentRef $ref) {
			return 'fa-file-sound-o';
			}

			protected function getByteLengthLimit() {
			return null;
			}

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

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

			$audio_types = PhabricatorEnv::getEnvConfig('files.audio-mime-types');
			$audio_types = array_keys($audio_types);

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

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

			$mime_type = $ref->getMimeType();

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

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

			return $container;
			}

			}