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PHP实现获取FLV文件的时间

2019-08-13 08:32:52来源：爱站网阅读 ()

说到PHP实现获取FLV文件的时间，大家了解吗？其实查看fopen文件，查看flv文件是十六进制数据并将其转换为数字，下面就让爱站技术频道小编带大家来学习PHP实现获取FLV文件的时间，希望能对你有帮助！

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;

}

?

?>