php flv视频时间获取函数

2015-01-24信息快讯网

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。

<?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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