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<?php namespace Done\Subtitles;
class VttConverter implements ConverterContract {
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) {
if(preg_match('/^WEBVTT.{0,}/', $block, $matches)) {
continue;
}
$lines = explode("\n", $block); // separate all block lines
if (strpos($lines[0], '-->') === false) { // first line not containing '-->', must be cue id
unset($lines[0]); // not supporting cue id
$lines = array_values($lines);
}
$times = explode(' --> ', $lines[0]);
$lines_array = array_map(static::fixLine(), array_slice($lines, 1)); // get all the remaining lines from block (if multiple lines of text)
if (count($lines_array) === 0) {
continue;
}
$internal_format[] = [
'start' => static::vttTimeToInternal($times[0]),
'end' => static::vttTimeToInternal($times[1]),
'lines' => $lines_array,
];
}
return $internal_format;
}
public function internalFormatToFileContent(array $internal_format)
{
$file_content = "WEBVTT\r\n\r\n";
foreach ($internal_format as $k => $block) {
$start = static::internalTimeToVtt($block['start']);
$end = static::internalTimeToVtt($block['end']);
$lines = implode("\r\n", $block['lines']);
$file_content .= $start . ' --> ' . $end . "\r\n";
$file_content .= $lines . "\r\n";
$file_content .= "\r\n";
}
$file_content = trim($file_content);
return $file_content;
}
// ------------------------------ private --------------------------------------------------------------------------
protected static function vttTimeToInternal($vtt_time)
{
$parts = explode('.', $vtt_time);
// parts[0] could be mm:ss or hh:mm:ss format -> always use hh:mm:ss
$parts[0] = substr_count($parts[0], ':') == 2 ? $parts[0] : '00:'.$parts[0];
$only_seconds = strtotime("1970-01-01 {$parts[0]} UTC");
$milliseconds = (float)('0.' . $parts[1]);
$time = $only_seconds + $milliseconds;
return $time;
}
protected static function internalTimeToVtt($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 $srt_time;
}
protected static function fixLine()
{
return function($line) {
if (substr($line, 0, 3) == '<v ') {
$line = substr($line, 3);
$line = str_replace('>', ' ', $line);
}
return $line;
};
}
}