PHP实现获取FLV文件的时间

functiongetTime($name)
{
if(!file_exists($name)){
return;
}
$flv_data_length=filesize($name);
$fp =@fopen($name,'rb');
$flv_header =fread($fp,5);
fseek($fp,5,SEEK_SET);
$frame_size_data_length =BigEndian2Int(fread($fp,4));
$flv_header_frame_length=9;
if($frame_size_data_length>$flv_header_frame_length){
fseek($fp,$frame_size_data_length-$flv_header_frame_length,SEEK_CUR);
}
$duration=0;
while((ftell($fp)+1)<$flv_data_length){
$this_tag_header=fread($fp,16);
$data_length =BigEndian2Int(substr($this_tag_header,3));
$timestamp =BigEndian2Int(substr($this_tag_header,8,3));
$next_offset =ftell($fp)-1+$data_length;
if($timestamp>$duration){
$duration=$timestamp;
}
fseek($fp,$next_offset,SEEK_SET);
}
fclose($fp);
return$duration;
}

functionget_flv_file_time($time)
{
$time=getTime($time);
$num=$time;
$sec=intval($num/1000);
$h =intval($sec/3600);
$m =intval(($sec%3600)/60);
$s =intval(($sec%60));
$tm =$h.':'.$m.':'.$s;
return$tm;
}

?>