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<?php |
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/** |
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* Helper class for determining media information, such as what codecs it uses |
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* etc. |
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* |
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* @author Sam Stenvall <[email protected]> |
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* @copyright Copyright © Sam Stenvall 2013- |
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* @license https://www.gnu.org/licenses/gpl.html The GNU General Public License v3.0 |
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*/ |
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class MediaInfoHelper |
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{ |
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const VIDEO_CODEC_AVC1 = 'avc1'; |
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const VIDEO_CODEC_H264 = 'h264'; |
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const AUDIO_CODEC_AAC = 'aac'; |
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const CONTAINER_MKV = 'mkv'; |
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const CONTAINER_MP4 = 'mp4'; |
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/** |
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* @var array list of codecs that are supported by major browsers |
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*/ |
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private static $nativeVideoCodecs = array( |
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self::VIDEO_CODEC_AVC1, |
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self::VIDEO_CODEC_H264 |
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); |
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/** |
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* @var array list of container types that are supported by major browsers |
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*/ |
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private static $nativeContainers = array( |
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self::CONTAINER_MKV, // Chrome only |
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self::CONTAINER_MP4, |
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); |
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/** |
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* @var array list of file extension that cannot be streamed |
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*/ |
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private static $nonStreamableExtension = array( |
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'iso', 'img', 'bdmv', 'ifo', |
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); |
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/** |
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* @var File the media file |
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*/ |
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private $_file; |
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/** |
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* Class constructor |
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* @param File $file the media file |
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*/ |
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public function __construct($file) |
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{ |
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$this->_file = $file; |
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} |
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/** |
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* Checks whether the specified will need transcoding in order to be |
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* playable in browsers. For now it assumes that all H.264/AAC/MP4 files |
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* are playable directly, which is not strictly true. |
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* @return boolean whether the file needs transcoding |
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*/ |
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public function needsTranscoding() |
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{ |
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// If stream details aren't available we'll just have to go on the |
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// file extension |
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if (!$this->hasMediaInfo()) |
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return !$this->hasNativeContainer(); |
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$videoCodec = $this->_file->streamdetails->video[0]->codec; |
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$audioCodec = $this->_file->streamdetails->audio[0]->codec; |
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return !($this->hasNativeContainer() && |
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in_array($videoCodec, self::$nativeVideoCodecs) && |
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$audioCodec === self::AUDIO_CODEC_AAC); |
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} |
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/** |
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* Checks whether the stream details contain the necessary media info |
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* @return boolean |
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*/ |
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public function hasMediaInfo() |
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{ |
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return count($this->_file->streamdetails->audio) !== 0 && |
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count($this->_file->streamdetails->video) !== 0; |
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} |
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/** |
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* Checks whether the current file is streamable. All files are streamable |
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* except DVD and BluRay images (or folder structures) |
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* @return boolean whether the file is streamable |
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*/ |
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public function isStreamable() |
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{ |
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foreach ($this->_file->getItemLinks() as $link) |
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{ |
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// Compare the extension against the blacklist |
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$fileInfo = new SplFileInfo($link->url); |
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$extension = strtolower($fileInfo->getExtension()); |
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if (in_array($extension, self::$nonStreamableExtension)) |
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return false; |
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} |
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return true; |
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} |
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/** |
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* @return boolean whether the file uses a container that browsers can |
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* generally play natively |
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*/ |
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private function hasNativeContainer() |
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{ |
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$fileInfo = new SplFileInfo($this->_file->file); |
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return in_array($fileInfo->getExtension(), self::$nativeContainers); |
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} |
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/** |
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* Returns the MIME type of the specified file |
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* @param string $file filename or URL |
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* @return string the MIME type, or null if it could not be determined |
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*/ |
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public static function getMIMEType($file) |
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{ |
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$fileInfo = new SplFileInfo($file); |
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switch ($fileInfo->getExtension()) |
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{ |
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case self::CONTAINER_MP4: |
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return 'video/mp4'; |
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// Ignore MKV on purpose, Chrome refuses to play MKV files when |
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// MIME type is set |
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} |
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return null; |
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} |
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} |
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Jalle19 /
xbmc-video-server
