<?php
/**
* This file is part of the PHP Video Toolkit v2 package.
*
* @author Oliver Lillie (aka buggedcom) <publicmail@buggedcom.co.uk>
* @license Dual licensed under MIT and GPLv2
* @copyright Copyright (c) 2008-2014 Oliver Lillie <http://www.buggedcom.co.uk>
* @package PHPVideoToolkit V2
* @version 2.1.1
* @uses ffmpeg http://ffmpeg.sourceforge.net/
*/
namespace PHPVideoToolkit;
/**
* @access public
* @author Oliver Lillie
* @package default
*/
class Format extends FfmpegParser
{
protected $_format;
protected $_type;
protected $_media_object;
protected $_format_to_command;
protected $_additional_commands;
protected $_removed_commands;
public function __construct($input_output_type, Config $config=null)
{
parent::__construct($config);
$this->setType($input_output_type);
$this->_additional_commands = array();
$this->_removed_commands = array();
$this->_media_object = null;
$this->_format = array(
'quality' => null,
'format' => null,
'strictness' => null,
'preset_options_file' => null,
'threads' => null,
);
$this->_format_to_command = array(
'quality' => '-qscale <setting>',
'format' => '-f <setting>',
'strictness' => '-strict <setting>',
'preset_options_file' => '-fpre <setting>',
'threads' => '-threads <setting>',
);
// add default input/output commands
if($input_output_type === 'output')
{
$this->setThreads(1)
->setStrictness('experimental')
->setQualityVsStreamabilityBalanceRatio(4);
}
else if($input_output_type === 'input')
{
}
else
{
throw new Exception('Unrecognised input/output type "'.$input_output_type.'" set in \\PHPVideoToolkit\\Format::__construct');
}
}
/**
* Gets a default format for the related path.
* If a default format is not found then the fallback_format_class is used.
*
* @access public
* @author Oliver Lillie
* @package default
* @param $path
* @param $config Config
* @param $fallback_format_class
* @param $type
* @return Format
*/
public static function getFormatFor($path, $config, $fallback_format_class='Format', $type='output')
{
if(in_array($type, array('input', 'output')) === false)
{
throw new Exception('Unrecognised format type "'.$type.'".');
}
$format = null;
$ext = pathinfo($path, PATHINFO_EXTENSION);
if(empty($ext) === false)
{
$format = Extensions::toBestGuessFormat($ext);
}
// check the requested class exists
$class_name = '\\PHPVideoToolkit\\'.$fallback_format_class.(empty($format) === false ? '_'.ucfirst(strtolower($format)) : '');
if(class_exists($class_name) === false)
{
$requested_class_name = $class_name;
$class_name = '\\PHPVideoToolkit\\'.$fallback_format_class;
if(class_exists($class_name) === false)
{
throw new Exception('Requested default format class does not exist, "'.($requested_class_name === $class_name ? $class_name : $requested_class_name.'" and "'.$class_name.'"').'".');
}
}
// check that it extends from the base Format class.
if($class_name !== '\\PHPVideoToolkit\\Format' && is_subclass_of($class_name, '\\PHPVideoToolkit\\Format') === false)
{
throw new Exception('The class "'.$class_name.'" is not a subclass of \\PHPVideoToolkit\\Format.');
}
return new $class_name($type, $config);
}
protected function _setFilter($format_key, FilterAbstract $filter)
{
if(isset($this->_format[$format_key]) === false)
{
throw new Exception('Unknown format key uncountered when setting a filter.');
}
if($this->_format[$format_key] === null)
{
$this->_format[$format_key] = array();
}
return array_push($this->_format[$format_key], $filter)-1;
}
/**
* undocumented function
*
* @access public
* @author Oliver Lillie
* @return void
*/
public function getFormatOptions()
{
return $this->_format;
}
/**
* undocumented function
*
* @access public
* @author Oliver Lillie
* @param Media $media
* @return void
*/
public function setMedia(Media $media)
{
$this->_media_object = $media;
return $this;
}
/**
* undocumented function
*
* @access public
* @author Oliver Lillie
* @param string $setting_name
* @return void
*/
protected function _blockSetOnInputFormat($setting_name)
{
if($this->_type === 'input')
{
$backtrace = debug_backtrace();
throw new Exception('The '.$setting_name.' cannot be set on an input \\'.get_class($backtrace[1]['object']).'::'.$backtrace[1]['function'].'.');
}
}
/**
* undocumented function
*
* @access public
* @author Oliver Lillie
* @return void
*/
public function updateFormatOptions(&$save_path)
{
if(empty($this->_media_object) === true)
{
throw new Exception('Unable to update format options as a Media object has not been set through '.get_class($this).'::setMedia');
}
return $this;
}
/**
* Builds a returnable command string for the give options and additional commands.
*
* @access public
* @author Oliver Lillie
* @return string
*/
public function getCommandString()
{
$commands = $this->getCommandsHash();
$command_string = '';
if(empty($commands) === false)
{
array_walk($commands, function(&$value, $key)
{
$value = $key.' '.$value;
});
$command_string = implode(' ', $commands);
}
return $command_string;
}
/**
* Builds a returnable command string for the give options and additional commands.
*
* @access public
* @author Oliver Lillie
* @return string
*/
public function getCommandsHash()
{
$commands = array();
$mapped_commands = array_values($this->_mapFormatToCommands());
$additional_commands = $this->_getAdditionalCommands();
$merged_commands = array_merge($commands, $mapped_commands, $additional_commands);
$commands = array();
if(empty($merged_commands) === false)
{
foreach ($merged_commands as $command)
{
if(preg_match('/^([^\s]+)\s+(.*)/', $command, $matches) > 0)
{
// check to see if we have the special "audio/video filters".
// if so then they must be grouped together in order to be sent.
// TODO decouple this into their own class
if($matches[1] === '-af' || $matches[1] === '-vf')
{
if(isset($commands[$matches[1]]) === false)
{
$commands[$matches[1]] = array();
}
array_push($commands[$matches[1]], $matches[2]);
}
else
{
$commands[$matches[1]] = trim($matches[2]);
}
}
else
{
$commands[$command] = '';
}
}
}
// post process the special cases for filters
// TODO decouple into own classes.
if(isset($commands['-vf']) === true)
{
$commands['-vf'] = implode(',', $commands['-vf']);
}
if(isset($commands['-af']) === true)
{
$commands['-af'] = implode(',', $commands['-af']);
}
return $commands;
}
/**
* Builds the additional commands.
*
* @access public
* @author Oliver Lillie
* @return array
*/
protected function _getAdditionalCommands()
{
$commands = array();
if(empty($this->_additional_commands) === false)
{
foreach ($this->_additional_commands as $option => $value)
{
array_push($commands, $option.' '.$value);
}
}
return $commands;
}
/**
* Maps the supplied format options to those in the Format->_format_to_command array.
*
* @access protected
* @author Oliver Lillie
* @return array
*/
protected function _mapFormatToCommands()
{
$options = array();
foreach ($this->_format as $option => $value)
{
// if the value is explicitly null or false we ignore it as it has not been set.
// if the value is to be set but not be ignored then it should be set as an empty string, ie '';
if($value === null || $value === false)
{
continue;
}
if(isset($this->_format_to_command[$option]) === false)
{
throw new Exception('Unable to map format option to command option as the command option does not exist in the map.');
}
// get the full command option string
$full_command = $this->_format_to_command[$option];
if(empty($full_command) === true)
{
continue;
}
// if the command is an array, that means it has differing options depending on whether or not
// this is an input or output format.
if(is_array($full_command) === true)
{
$full_command = $full_command[$this->_type];
}
// now just the main command so we can ignore it if found in the additional supplied commands
// list of the list of commands to ignore.
preg_match('/^([^\s]+)/', $full_command, $matches);
$command_name = $matches[1];
// if we've been set this command as an additional command, the additional command takes precedent
if(isset($this->_additional_commands[$command_name]) === true)
{
continue;
}
// do we have to "remove" / ignore any commands?
if(isset($this->_removed_commands[$command_name]) === true)
{
continue;
}
// otherwise if the value is an array, that means we have multiple options to replace into the command
if(is_array($value) === true)
{
$find = array_keys($value);
array_walk($find, function(&$value, $key)
{
$value = '<'.$value.'>';
});
$command = str_replace($find, $value, $full_command);
}
// otherwise, it's jsut a <setting> that is to be replaced
else
{
$command = str_replace('<setting>', $value, $full_command);
}
$options[$option] = $command;
}
return $options;
}
/**
* Adds additional commands that will be added to the formatted command string
* that is returned from the format object. Any command options added here take
* precendence over those set in the Format->_format array
*
* @access public
* @author Oliver Lillie
* @param string $option
* @param string $arg
* @return void
*/
public function addCommand($option, $arg)
{
$this->_additional_commands[$option] = $arg;
}
public function removeCommand()
{
}
/**
* Sets the format type, either input or output
*
* @access public
* @author Oliver Lillie
* @param string $type
* @return void
*/
public function setType($type)
{
// validate input
if(in_array($type, array('input', 'output')) === true)
{
$this->_type = $type;
return $this;
}
throw new Exception('Unrecognised format "'.$format.'" set in \\PHPVideoToolkit\\'.get_class($this).'::setFormat');
}
/**
* A preset file contains a sequence of option=value pairs, one for each line, specifying a sequence of options
* which would be awkward to specify on the command line. Lines starting with the hash (’#’) character are ignored
* and are used to provide comments. Check the ‘presets’ directory in the FFmpeg source tree for examples.
*
* @access public
* @author Oliver Lillie
* @link http://ffmpeg.org/ffmpeg.html#toc-Preset-files
* @param string $preset_file_path
* @return void
*/
public function setPresetOptionsFile($preset_file_path)
{
if($preset_file_path === null)
{
$this->_format['preset_options_file'] = null;
return $this;
}
$preset_file_path = realpath($preset_file_path);
if($preset_file_path === false || is_file($preset_file_path) === false)
{
throw new Exception('Preset options file "'.$preset_file_path.'" set in \\PHPVideoToolkit\\'.get_class($this).'::setPresetOptionsFile does not exist.');
}
else if(is_readable($preset_file_path) === false)
{
throw new Exception('Preset preset options file "'.$preset_file_path.'" set in \\PHPVideoToolkit\\'.get_class($this).'::setPresetOptionsFile is not readable.');
}
$this->_format['preset_options_file'] = $preset_file_path;
return $this;
}
/**
* Sets the output strictness (-strictness) determining what level of stable funcitonality is used.
* By default "experimental" is used/
*
* @access public
* @author Oliver Lillie
* @param string $strictness
* @return void
*/
public function setStrictness($strictness)
{
if($strictness === null)
{
$this->_format['strictness'] = null;
return $this;
}
if(in_array($strictness, array('very', 'strict', 'normal', 'unofficial', 'experimental')) === true)
{
$this->_format['strictness'] = $strictness;
return $this;
}
throw new Exception('Unrecognised strictness "'.$strictness.'" set in \\PHPVideoToolkit\\'.get_class($this).'::setStrictness');
}
/**
* Sets the output format of the ffmpeg process.
*
* @access public
* @author Oliver Lillie
* @param string $format
* @return void
*/
public function setFormat($format)
{
// TODO work out what can be input and what can't be inputed
if($format === null)
{
$this->_format['format'] = null;
return $this;
}
// validate input
$valid_formats = array_keys($this->getFormats());
if(in_array($format, $valid_formats) === true)
{
// check to see if segmenting has been requested. If it has warn of the Media::split function instead.
if($format === 'segment')
{
throw new Exception('You cannot set the format to segment, please use instead the function \\PHPVideoToolkit\\Media::segment.');
}
$this->_format['format'] = $format;
return $this;
}
throw new Exception('Unrecognised format "'.$format.'" set in \\PHPVideoToolkit\\'.get_class($this).'::setFormat');
}
/**
* undocumented function
*
* @access public
* @author Oliver Lillie
* @param string $threads
* @return void
*/
public function setThreads($threads)
{
$this->_blockSetOnInputFormat('thread level');
if($threads === null)
{
$this->_format['threads'] = null;
return $this;
}
if($threads < 1 || $threads > 64)
{
throw new InvalidArgumentException('Invalid `threads` value; the value must fit in range 1 - 64.');
}
$this->_format['threads'] = (int) $threads;
return $this;
}
/**
* undocumented function
*
* @access public
* @author Oliver Lillie
* @see http://www.kilobitspersecond.com/2007/05/24/ffmpeg-quality-comparison/
* @param string $qscale
* @return void
*/
public function setQualityVsStreamabilityBalanceRatio($qscale)
{
$this->_blockSetOnInputFormat('quality stream ability balance ratio (qscale)');
if($qscale === null)
{
$this->_format['quality'] = null;
return $this;
}
if($qscale < 1 || $qscale > 31)
{
throw new InvalidArgumentException('Invalid quality stream ability balance ratio (qscale) value; the value must fit in range 1 - 31.');
}
$this->_format['quality'] = (int) $qscale;
return $this;
}
}
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