利用php获得flv视频长度的实例代码

时间:2022-03-19 11:36:47

废话不多说了,直接给大家贴代码了,具体代码如下所示:

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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 $int_value;
}
//获得视频的数字时间
function getFlvDuration($name){
  if(!file_exists($name)){
    return;
  }
  $flv_data_length=filesize($name);
  $fp = @fopen($name, 'r');
  $flv_header = fread($fp, 5);
  fseek($fp, 5, SEEK_SET);
  $frame_size_data_length = $this->BigEndian2Int(fread($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     = $this->BigEndian2Int(substr($this_tag_header, 5, 3));
     $timestamp      = $this->BigEndian2Int(substr($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 $duration;
}
//转化为0:03:56的时间格式
function getFlvTime($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;
}

总结

以上所述是小编给大家介绍的利用php获得flv视频长度的实例代码,希望对大家有所帮助,如果大家有任何疑问请给我留言,小编会及时回复大家的。在此也非常感谢大家对服务器之家网站的支持!

原文链接:http://blog.csdn.net/jiongxian1/article/details/78353314