<?PHP
/*
Project Name: Workflows in Digital Signage / Digital TV :: ffmpeg encoding 
Plugin URI: http://ieservices.de/projects
Description: This is a snipped example script preparing instruction sets for ffmpeg to receive information about a multimedia file
Author: Martin Andreas Woerz
Author URI: http://ieservices.de/projects
*/

/*
	@param $aspect["output"]= array ("height" => "", "width" => "");
	@return: (String) $execution_instrution
	@description: prepare the right video aspect for the ffmpeg encoding
*/
function build_ffmpeg_aspect_exec($aspect){
	
	$exec ='';
	
	$exec .= ' -s '.$aspect["output"]["width"].'x'.$aspect["output"]["height"];
	
	$exec .=' -aspect '.$aspect["output"]["ratio"];

	if(isset($aspect["output"]["pad"])){
		$exec .=' -padtop '.$aspect["output"]["pad"]["top"];
		$exec .=' -padbottom '.$aspect["output"]["pad"]["bottom"];
		$exec .=' -padcolor 000000';			
			
	}
	if(isset($aspect["output"]["crop"])){
	
		$exec .=' -croptop '.$aspect["output"]["crop"]["top"];
		$exec .=' -cropbottom '.$aspect["output"]["crop"]["bottom"];
		
	}

	return $exec;
	
}

/*
	@param $input_file
	@return: (array) $file
	@description: try to get the most information about the given multimedia file by asking ffmpeg to write it in an array
*/
function ffmpegGetInputFileInformation($input_file){
	
	exec(ffmpeg_binary.' -i '.$input_file.' 2>&1 | grep "Duration"',$file_information);
	
	$file_information_split = split(',', $file_information[0]);
	$file_duration = split('Duration: ', $file_information_split[0]);
	$file["duration"] = verifyColonTime(trim($file_duration[1]));
	
	$file_bitrate_split = split(',', $file_information_split[2]);
	$file_bitrate = split('bitrate: ', $file_information[0]);
	#$file["bitrate"] = trim($file_bitrate[1]);
	
	if(eregi('kb/s', trim($file_bitrate[1])))
		$file["bitrate"] = (int) trim(array_shift(split('kb/s', $file_bitrate[1])));

	$file["estimated_filesize"] = ($file["duration"]["total_lenght"] / ($file["bitrate"]/1024));
	$file["estimated_filesize_hr"] = formatBytes($file["estimated_filesize"]);
	return $file;
}

/*
	@param $input_file
	@return: (array) $video
	@description: try to get the most video settings information about the given multimedia file by asking ffmpeg to write it in an array
*/
function ffmpegGetInputFileVideoInformation($input_file){

	//here we are throwing the input file to ffmpeg and grep an array out of the ffmpeg information result	
	exec(ffmpeg_binary.' -i '.$input_file.' 2>&1 | grep "Video" | awk -F"Video: " "{ print $2 }"',$video_information);
	$video_information_split = split(',', $video_information[0]);
	
	
	$codec_split = split('Video: ',$video_information_split[0]);
	$video["codec"] = trim($codec_split[1]);
	
	
	$video["colorspace"] = trim($video_information_split[1]);
	
	//figure out the resolution
	preg_match('/[1-9][0-9]+x[1-9][0-9]+/', trim($video_information_split[2]), $video_resolution, PREG_OFFSET_CAPTURE);
	$video["resolution"] = $video_resolution[0][0];
	
	//split up the resolution in width and height
	$video_resolution_split = split('x',$video["resolution"]);
	$video["width"] = $video_resolution_split[0];
	$video["height"] = $video_resolution_split[1];
	
	//get additional information
	if(eregi('tbr', $video_information_split[3]))
		$video["tbr"] = trim(array_shift(split('tbr',$video_information_split[3])));
	if(eregi('tbn', $video_information_split[4]))
		$video["tbn"] = trim(array_shift(split('tbn',$video_information_split[4])));
	if(eregi('tbc', $video_information_split[5]))
		$video["tbc"] = trim(array_shift(split('tbc',$video_information_split[5])));
	
	return $video;
}

/*
	@param $input_file
	@return: (array) $audio
	@description: try to get the most audio settings information about the given multimedia file by asking ffmpeg to write it in an array
*/	
function ffmpegGetAudioSettings($input_file){

	echo 'getAudioSettings';
	//here we are throwing the input file to ffmpeg and grep an array out of the ffmpeg information result
	exec(ffmpeg_binary.' -i '.$input_file.' 2>&1 | grep "Audio" | awk -F"Audio: " "{ print $2 }"', $audio_information);
	
	$audio_settings = split(', ',$audio_information[0]);

	$codec_split = split('Audio: ',$audio_settings[0]);
	$ffmpeg["settings"]["audio"]["codec"] = trim($codec_split[1]);
	
	//Channels $audio_settings[2];
	if(eregi('mono', $audio_settings[2]))
			$ffmpeg["settings"]["audio"]["channels"]=1;
	if(eregi('stereo|2 channels', $audio_settings[2]))
			$ffmpeg["settings"]["audio"]["channels"]=2;
	if(eregi('ac3|aac|5.1', $audio_settings[2]))
			$ffmpeg["settings"]["audio"]["channels"]=6;
	$ffmpeg["settings"]["audio"]["channelformat"]=$audio_settings[2];
		
	if(strlen($audio_settings[4]>2))
		$ffmpeg["settings"]["audio"]["bitrate"]=$audio_settings[4];
	
	eregi('[0-9]+', $audio_settings[1], $match);
	$ffmpeg["settings"]["audio"]["samplingrate"] = $match[0];

	return $ffmpeg["settings"]["audio"];
}
?>