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<?php namespace Done\Subtitles;
class SrtConverter implements ConverterContract {
/**
* Converts file's content (.srt) to library's "internal format" (array)
*
* @param string $file_content Content of file that will be converted
* @return array Internal format
*/
public function fileContentToInternalFormat($file_content)
{
$internal_format = []; // array - where file content will be stored
$blocks = explode("\n\n", trim($file_content)); // each block contains: start and end times + text
foreach ($blocks as $block) {
$lines = explode("\n", $block); // separate all block lines
$times = explode(' --> ', $lines[1]); // one the second line there is start and end times
$internal_format[] = [
'start' => static::srtTimeToInternal($times[0]),
'end' => static::srtTimeToInternal($times[1]),
'lines' => array_slice($lines, 2), // get all the remaining lines from block (if multiple lines of text)
];
}
return $internal_format;
}
/**
* Convert library's "internal format" (array) to file's content
*
* @param array $internal_format Internal format
* @return string Converted file content
*/
public function internalFormatToFileContent(array $internal_format)
{
$file_content = '';
foreach ($internal_format as $k => $block) {
$nr = $k + 1;
$start = static::internalTimeToSrt($block['start']);
$end = static::internalTimeToSrt($block['end']);
$lines = implode("\r\n", $block['lines']);
$file_content .= $nr . "\r\n";
$file_content .= $start . ' --> ' . $end . "\r\n";
$file_content .= $lines . "\r\n";
$file_content .= "\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 $srt_time
*
* @return float
*/
protected static function srtTimeToInternal($srt_time)
{
$parts = explode(',', $srt_time);
$only_seconds = strtotime("1970-01-01 {$parts[0]} UTC");
$milliseconds = (float)('0.' . $parts[1]);
$time = $only_seconds + $milliseconds;
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); // 1.23
$whole = $parts[0]; // 1
$decimal = isset($parts[1]) ? substr($parts[1], 0, 3) : 0; // 23
$srt_time = gmdate("H:i:s", floor($whole)) . ',' . str_pad($decimal, 3, '0', STR_PAD_RIGHT);
return $srt_time;
}
}