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<?php namespace Done\Subtitles;
class AssConverter implements ConverterContract {
public function fileContentToInternalFormat($file_content)
{
preg_match_all('/0,([^,]*),([^,]*),Default,,0,0,0,,(.*)/', $file_content, $blocks, PREG_SET_ORDER);
foreach ($blocks as $block) {
$internal_format[] = [
'start' => static::assTimeToInternal($block[1]),
'end' => static::assTimeToInternal($block[2]),
'lines' => explode('\N', $block[3]),
];
}
return $internal_format;
}
public function internalFormatToFileContent(array $internal_format)
{
$file_content = '[Script Info]
; This is an Advanced Sub Station Alpha v4+ script.
Title: subtitles
ScriptType: v4.00+
Collisions: Normal
PlayDepth: 0
[V4+ Styles]
Format: Name, Fontname, Fontsize, PrimaryColour, SecondaryColour, OutlineColour, BackColour, Bold, Italic, Underline, StrikeOut, ScaleX, ScaleY, Spacing, Angle, BorderStyle, Outline, Shadow, Alignment, MarginL, MarginR, MarginV, Encoding
Style: Default,Arial,20,&H00FFFFFF,&H0300FFFF,&H00000000,&H02000000,0,0,0,0,100,100,0,0,1,2,1,2,10,10,10,1
[Events]
Format: Layer, Start, End, Style, Actor, MarginL, MarginR, MarginV, Effect, Text
';
foreach ($internal_format as $k => $block) {
$start = static::internalTimeToSrt($block['start']);
$end = static::internalTimeToSrt($block['end']);
$lines = implode('\N', $block['lines']);
$file_content .= "Dialogue: 0,{$start},{$end},Default,,0,0,0,,{$lines}\r\n";
}
$file_content = trim($file_content);
return $file_content;
}
// ------------------------------ private --------------------------------------------------------------------------
/**
* Convert .srt file format to internal time format (float in seconds)
* Example: 00:02:17,440 -> 137.44
*
* @param $srt_time
*
* @return float
*/
protected static function assTimeToInternal($srt_time)
{
$parsed = date_parse("1970-01-01 $srt_time UTC");
$time = $parsed['hour'] * 3600 + $parsed['minute'] * 60 + $parsed['second'] + $parsed['fraction'];
return $time;
}
/**
* Convert internal time format (float in seconds) to .srt time format
* Example: 137.44 -> 00:02:17,440
*
* @param float $internal_time
*
* @return string
*/
protected static function internalTimeToSrt($internal_time)
{
$parts = explode('.', $internal_time);
$whole = $parts[0]; // 1
$decimal = isset($parts[1]) ? substr($parts[1], 0, 2) : 0;
$srt_time = gmdate("G:i:s", floor($whole)) . '.' . str_pad($decimal, 2, '0', STR_PAD_RIGHT);
return $srt_time;
}
}