时间:2021-07-01 10:21:17 帮助过:15人阅读
这篇文章主要介绍了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。
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FLV.flv”)即可。
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