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<?php namespace Done\Subtitles;
class StlConverter implements ConverterContract {
public function fileContentToInternalFormat($file_content)
{
$not_trimmed_lines = explode("\n", $file_content);
$lines = array_map('trim', $not_trimmed_lines);
$frames_per_seconds = static::framesPerSecond($lines);
$internal_format = [];
foreach ($lines as $line) {
if (!static::doesLineHaveTimestamp($line)) {
continue;
}
$internal_format[] = [
'start' => static::convertFromSrtTime(static::getStartLine($line), $frames_per_seconds),
'end' => static::convertFromSrtTime(static::getEndLine($line), $frames_per_seconds),
'lines' => static::getLines($line),
];
}
return $internal_format;
}
public function internalFormatToFileContent(array $internal_format)
{
$stl = '';
foreach ($internal_format as $row) {
$stl_start = static::toStlTime($row['start']);
$stl_end = static::toStlTime($row['end']);
$stt_lines = static::toStlLines($row['lines']);
$line = "$stl_start , $stl_end , $stt_lines\r\n";
$stl .= $line;
}
return trim($stl);
}
// ------------------------- private -------------------------------------------------------------------------------
protected static function getLines($original_line)
{
$parts = explode(',', $original_line);
// remove first two time elements
array_shift($parts);
array_shift($parts);
$lines_string = implode(',', $parts);
$not_trimmed_lines = explode('|', $lines_string);
$lines = array_map('trim', $not_trimmed_lines);
return $lines;
}
protected static function getStartLine($line)
{
$parts = explode(',', $line);
$start_string = trim($parts[0]);
return $start_string;
}
protected static function getEndLine($line)
{
$parts = explode(',', $line);
$end_string = trim($parts[1]);
return $end_string;
}
protected static function convertFromSrtTime($srt_time, $frames_per_seconds)
{
$parts = explode(':', $srt_time);
$frames = array_pop($parts);
$tmp_time = implode(':', $parts); // '21:30:10'
$only_seconds = strtotime("1970-01-01 $tmp_time UTC");
if ($frames > $frames_per_seconds - 1) {
$frames = $frames_per_seconds - 1;
}
$milliseconds = $frames / $frames_per_seconds;
$seconds = $only_seconds + $milliseconds;
return $seconds;
}
protected static function returnFramesFromTime($srt_time)
{
$parts = explode(':', $srt_time);
$frames = array_pop($parts);
return $frames;
}
protected static function doesLineHaveTimestamp($line)
{
$first_two_symbols = substr($line, 0, 2);
return is_numeric($first_two_symbols);
}
// stl counts frames at the end (25 - 30 frames)
protected static function toStlTime($seconds)
{
if ($seconds >= 86400) {
throw new \Exception('conversion function doesnt support more than 1 day, edit the code');
}
$milliseconds = $seconds - (int)$seconds;
$frames_unpadded = floor(25 * $milliseconds); // 25 frames
$frames = str_pad($frames_unpadded, 2, '0', STR_PAD_LEFT);
$stl_time = gmdate("H:i:s:$frames", (int)$seconds);
return $stl_time;
}
protected static function toStlLines($lines)
{
return implode(' | ', $lines);
}
protected static function framesPerSecond($lines)
{
$max_frames = 0;
foreach ($lines as $line) {
$max_frames = self::maxFrames($line, $max_frames);
}
if ($max_frames >= 30) {
return $max_frames + 1;
}
if ($max_frames >= 25) {
return 30;
}
return 25;
}
private static function maxFrames($line, $max_frames)
{
if (!static::doesLineHaveTimestamp($line)) {
return $max_frames;
}
$frames1 = static::returnFramesFromTime(static::getStartLine($line));
$frames2 = static::returnFramesFromTime(static::getEndLine($line));
if ($frames1 > $max_frames) {
$max_frames = $frames1;
}
if ($frames2 > $max_frames) {
$max_frames = $frames2;
}
return $max_frames;
}
}