PHP实现获取FLV文件的时间

主要介绍了PHP实现获取FLV文件的时间,本文直接给出实现代码和使用方法,需要的朋友可以参考下。

PHP如何获取FLV文件时间呢,答案是fopen文件后查看FLV文件是HEX数据,并转换为number。

复制代码 代码如下:

<?php

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;

}

?>

直接使用get_flv_file_time(“你的”)即可。