/**
* @param $file_name
* @return array
* @throws ApplicationException
*/
public static function generate($file_name)
{
set_time_limit(0);
$temp_file = TempFileProvider::generate("peaks", ".raw");
$command = sprintf("%s -v quiet -i %s -ac 1 -f u8 -ar 11025 -acodec pcm_u8 %s", self::$ffmpeg_cmd, escapeshellarg($file_name), escapeshellarg($temp_file));
shell_exec($command);
if (!file_exists($temp_file)) {
throw new ApplicationException("Waveform could not be generated!");
}
$chunk_size = ceil(filesize($temp_file) / self::PEAKS_RESOLUTION);
$peaks = withOpenedFile($temp_file, "r", function ($fh) use(&$chunk_size) {
while ($data = fread($fh, $chunk_size)) {
$peak = 0;
$array = str_split($data);
foreach ($array as $item) {
$code = ord($item);
if ($code > $peak) {
$peak = $code;
}
if ($code == 255) {
break;
}
}
(yield $peak - 127);
}
});
TempFileProvider::delete($temp_file);
return $peaks;
}
/**
* @param $file
* @throws ApplicationException
*/
private static function write($file)
{
header('Last-Modified: ' . gmdate('D, d M Y H:i:s', $file[TFiles::MTIME]) . ' GMT');
header('Cache-Control: max-age=0');
header('Content-Type: ' . $file[TFiles::CONTENT_TYPE]);
if (isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) && strtotime($_SERVER['HTTP_IF_MODIFIED_SINCE']) >= $file[TFiles::MTIME]) {
http_response_code(304);
return;
}
$filename = FSTools::hashToFullPath($file[TFiles::SHA1]);
if (!file_exists($filename)) {
throw new ApplicationException("Internal server error: file not exists!");
}
$filesize = filesize($filename);
if (isset($_SERVER["HTTP_RANGE"])) {
$range = str_replace("bytes=", "", $_SERVER["HTTP_RANGE"]);
$start = Arrays::first(explode("-", $range));
} else {
$start = 0;
}
if (isset($range)) {
http_response_code(HttpStatusCodes::HTTP_PARTIAL_CONTENT);
header("Content-Range: bytes " . $start . "-" . ($filesize - 1) . "/" . $filesize);
header("Content-Length: " . ($filesize - $start));
} else {
http_response_code(HttpStatusCodes::HTTP_OK);
header("Content-Length: " . $filesize);
}
header("Accept-Ranges: bytes");
set_time_limit(0);
withOpenedFile($filename, "rb", function ($fh) use($start) {
if ($start > 0) {
fseek($fh, $start, SEEK_SET);
}
while ($data = fread($fh, self::READ_BUFFER_SIZE)) {
echo $data;
flush();
}
});
}
