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php获取flv时间!有源码!

2012-01-26 00:39 148 查看
php获取flv时间!有源码!拿来就可以使用!超级简单。

<?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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