PHP implementation of obtaining the time of FLV file_PHP tutorial

The time for PHP to obtain FLV files

This article mainly introduces the time for PHP to obtain FLV files. This article directly gives the implementation code and usage method. Friends who need it can For reference

How to get the FLV file time in PHP? The answer is to fopen the file and check that the FLV file is HEX data and convert it to number.

The code is as follows:

functionBigEndian2Int($byte_word,$signed=false)
{
$int_value =0;
$byte_wordlen=strlen($byte_word);
for($i=0;$i<$byte_wordlen;$i++){
$int_value+=ord($byte_word{$i})*pow(256,($byte_wordlen-1-$i));
}
if($signed){
$sign_mask_bit=0x80<<(8*($byte_wordlen-1));
if($int_value&$sign_mask_bit){
$int_value=0-($int_value&($sign_mask_bit-1));
}
}
return$int_value;
}

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,5,3));
$timestamp =BigEndian2Int(substr($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;
}

?>

Just use get_flv_file_time("your FLV.flv") directly.

http://www.bkjia.com/PHPjc/955835.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/955835.htmlTechArticleThe time when PHP implements obtaining FLV files. This article mainly introduces the time when PHP implements obtaining FLV files. This article directly explains The implementation code and usage method are provided. Friends in need can refer to how to obtain PHP...