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<?php |
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namespace Divergence\Models\Media; |
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use Exception; |
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class Audio extends Media |
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{ |
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// configurables |
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public static $previewExtractCommand = 'ffmpeg -i %1$s -ss %3$u -t %4$u -f mp3 -y %2$s'; // 1=input file, 2=output file, 3=start time, 4=duration |
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public static $previewDuration = 30; |
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public static $iconPath = '/site-root/img/icons/filetypes/mp3.png'; |
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// magic methods |
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public static function __classLoaded() |
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{ |
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$className = get_called_class(); |
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Media::$mimeHandlers['audio/mpeg'] = $className; |
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parent::__classLoaded(); |
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} |
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public function getValue($name) |
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{ |
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switch ($name) { |
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case 'ThumbnailMIMEType': |
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return 'image/png'; |
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case 'Width': |
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return 128; |
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case 'Height': |
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return 128; |
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case 'Extension': |
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switch ($this->MIMEType) { |
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case 'audio/mpeg': |
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return 'mp3'; |
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default: |
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throw new Exception('Unable to find audio extension for mime-type: '.$this->MIMEType); |
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} |
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// no break |
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default: |
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return parent::getValue($name); |
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} |
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} |
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// public methods |
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public static function getBlankPath($contextClass) |
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{ |
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$node = Site::resolvePath(static::$iconPath); |
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return $node ? $node->RealPath : null; |
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} |
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public function getImage($sourceFile = null) |
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{ |
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if (!isset($sourceFile)) { |
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$sourceFile = $this->BlankPath; |
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} |
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return imagecreatefromstring(file_get_contents($sourceFile)); |
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} |
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public function createPreview() |
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{ |
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// check if a preview already exists |
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if (!empty($_REQUEST['startTime']) && is_numeric($_REQUEST['startTime']) && ($_REQUEST['startTime'] >= 0) && ($_REQUEST['startTime'] < $this->Duration)) { |
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$startTime = $_REQUEST['startTime']; |
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} else { |
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$startTime = 0; |
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} |
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$previewPath = tempnam('/tmp', 'mediaPreview'); |
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// generate preview |
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$cmd = sprintf(static::$previewExtractCommand, $this->FilesystemPath, $previewPath, $startTime, static::$previewDuration); |
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shell_exec($cmd); |
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if (!filesize($previewPath)) { |
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throw new Exception('Preview output is empty'); |
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} |
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// create media instance |
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$PreviewMedia = Media::createFromFile($previewPath, [ |
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'ContextClass' => 'Media' |
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,'ContextID' => $this->ID |
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,'Caption' => sprintf('%u sec preview (%us-%us)', static::$previewDuration, $startTime, $startTime+static::$previewDuration), |
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]); |
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return $PreviewMedia; |
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} |
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// static methods |
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# public static function analyzeFile($filename, $mediaInfo = array()) |
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# { |
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# // Initialize getID3 engine |
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# $getID3 = new getID3(); |
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# |
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# $mediaInfo['id3Info'] = $getID3->analyze($filename); |
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# |
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# $mediaInfo['width'] = 0; |
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# $mediaInfo['height'] = 0; |
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# $mediaInfo['duration'] = $mediaInfo['id3Info']['playtime_seconds']; |
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# |
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# return $mediaInfo; |
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# } |
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} |
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Divergence /
framework
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