利用php获得flv视频长度的实例代码_PHP教程

利用php获得flv视频长度的实例代码

2021-07-12 17:08追逐吾之所求 PHP教程

这篇文章主要介绍了利用php获得flv视频长度的实例代码,需要的朋友可以参考下

废话不多说了，直接给大家贴代码了，具体代码如下所示：

				?

									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; 

									}