PHP實(shí)現(xiàn)獲取FLV文件的時(shí)間

    這篇文章主要介紹了PHP實(shí)現(xiàn)獲取FLV文件的時(shí)間,本文直接給出實(shí)現(xiàn)代碼和使用方法,需要的朋友可以參考下
    PHP如何獲取FLV文件時(shí)間呢,答案是fopen文件后查看FLV文件是HEX數(shù)據(jù),并轉(zhuǎn)換為number。
    代碼如下:
    <?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 );
    $flv_header =fread($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FLV.flv”)即可。