<?php
/**
 * (c) Copyright 2006 John "ChaosTangent" Noel
 * http://blog.chaostangent.com
 * me@chaostangent.com
 *
 * This file is released under the Creative Commons Attribution License
 * http://creativecommons.org/licenses/by/2.5/
 *
 * If you use this as a base for anything, inspiration or whatever
 * drop me a line and let me know
 */

$ssCount = 100;

$workingDir = dirname(__FILE__);
$mplayerCommand = realpath("{$workingDir}".DIRECTORY_SEPARATOR."..".DIRECTORY_SEPARATOR."mplayer") . DIRECTORY_SEPARATOR . "mplayer.exe";

//$argsPlay = ' -really-quiet -vo png:z=0 -nosound -ss {seek} -frames 2';
$argsPlay = ' -really-quiet -vo jpeg:progressive:quality=90 -nosound -ss {seek} -frames 2';
$argsInfo = ' -vo null -nosound -frames 0 -identify';

if(!empty($_SERVER['argv'][1]) && file_exists($_SERVER['argv'][1]))
{
	// create screenshot directory
	$screenshotDir = realpath("{$workingDir}".DIRECTORY_SEPARATOR."..".DIRECTORY_SEPARATOR."screenshots") . DIRECTORY_SEPARATOR . basename($_SERVER['argv'][1]);
	if(!is_dir($screenshotDir))
	{
		mkdir($screenshotDir);
	}
	chdir($screenshotDir);

	echo "Outputting screenshots to: {$screenshotDir}\n\n";

	$infoOutput = shell_exec("{$mplayerCommand} {$argsInfo} \"{$_SERVER['argv'][1]}\"");

	//$matcher = '/ID_VIDEO_WIDTH=(\d+)$|ID_VIDEO_HEIGHT=(\d+)$|ID_LENGTH=(\d+\.\d+)$/m';
	$matcher = '/ID_LENGTH=(\d+\.\d+)$/m';
	$matches = array();

	preg_match_all($matcher, $infoOutput, $matches);

	$fileLength = (!empty($matches[1][0])) ? floatval($matches[1][0]) : 1140;		// assume 24 minutes

	if(isset($ssFreq))
	{
		$screenshotCount = round($fileLength / $ssFreq);
		$increment = $ssFreq;
	}
	elseif(isset($ssCount))
	{
		$screenshotCount = $ssCount;
		$increment = round($fileLength / $ssCount);
	}
	else
	{
		$screenshotCount = 10;
		$increment = round($fileLength / 10);
	}

	// take those screenshots
for($i = 0; $i < $screenshotCount; $i++)
{
	$offset = $i * $increment;
	$tempArgs = str_replace('{seek}', $offset, $argsPlay);

	echo "Taking screenshot at {$offset}s\n";

	shell_exec("{$mplayerCommand} {$tempArgs} \"{$_SERVER['argv'][1]}\"");
		if(file_exists('00000002.jpg'))
		{
			@unlink('00000001.jpg');
			$format = "%02d";
			if($screenshotCount > 99)
			{
				$format = "%03d";
			}
			elseif($screenshotCount > 999)
			{
				$format = "%04d";
			}
			elseif($screenshotCount > 9999)
			{
				$format = "%05d";
			}
			else
			{
				$format = "%06d";		// beyond this, you're on your own
			}
			rename('00000002.jpg', sprintf("%03d", $i).".jpg");
		}
	}
}
else
{
	echo "Unable to find file: {$_SERVER['argv'][1]}";
	system('pause');
}

?>