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利用php获得flv视频长度的实例代码

发布:smiling　来源: PHP粉丝网　添加日期：2018-09-13 17:19:57　浏览: 评论：0　

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; //phpfensi.com

  $sec = intval($num/1000);

  $h = intval($sec/3600);

  $m = intval(($sec%3600)/60);

  $s = intval(($sec%60));

  $tm = $h.':'.$m.':'.$s;

  return $tm;

}