php flv视频时间获取函数

代码如下:


<?php

　function BigEndian2Int($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;

　}

　function getTime($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;

　}

　function fn($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;

　}

　echo getTime("27729.flv");//显示数字时间如236722

　echo fn(236722); //显示时间格式0:03:56

　?>




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