php flv视频时间获取函数

 更新时间:2010年06月29日 08:55:15   转载 作者:  
php获取flv时间!有源码!拿来就可以使用!超级简单。可以方便的得到flv视频需要播放的时间。
复制代码 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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