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PHP gets flv video time length code_PHP tutorial

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Release: 2016-07-20 11:08:03
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php教程获取flv视频时间长度代码
  

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 


www.bkjia.comtruehttp://www.bkjia.com/PHPjc/444906.htmlTechArticlephp教程获取flv视频时间长度代码 function bigendian2int($byte_word, $signed = false) { $int_value = 0; $byte_wordlen = strlen($byte_word); for ($i = 0; $i $byte_wordlen;...
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