[源码学习] 用PHP读写音频文件的信息(支持WMA和MP3)

          $k = substr($name, 3);
          if (in_array($k, $this->items2))
          {  // all is string value (refer to falg for other tags)
            $ret[$k] = dbcs_gbk($vbuf);
          }
        }    
      }
      else
      {  // skip only
        if ($tmp['len'] > 24) $this->head_off += ($tmp['len'] - 24);
      }
    }
    $this->_file_deinit();
    return $ret;
  }

  // get the header?
  function _init_header()
  {
    fseek($this->fd, 0, SEEK_SET);
    $buf = fread($this->fd, 30);
    if (strlen($buf) != 30) return false;
    $tmp = unpack('H32id/Vlen/Vlen2/Vnum/H4unused', $buf);
    if ($tmp['id'] != '3026b2758e66cf11a6d900aa0062ce6c')
      return false;

    $this->head_buf = fread($this->fd, $tmp['len'] - 30);
    $this->head = $tmp;
    return true;
  }

  // _get_head_frame()
  function _get_head_frame()
  {
    $buf = $this->_read_head_buf(24);    
    if (strlen($buf) != 24) return false;
    $tmp = unpack('H32id/Vlen/H8unused', $buf);
    return $tmp;
  }
}

// mp3 class (if not IDv2 then select IDv1)
class _Mp3Exif extends _AudioExif
{
  var $head1;
  var $genres = array('Blues','Classic Rock','Country','Dance','Disco','Funk','Grunge','Hip-Hop','Jazz','Metal','New Age','Oldies','Other','Pop','R&B','Rap','Reggae','Rock','Techno','Industrial','Alternative','Ska','Death Metal','Pranks','Soundtrack','Euro-Techno','Ambient','Trip-Hop','Vocal','Jazz+Funk','Fusion','Trance','Classical','Instrumental','Acid','House','Game','Sound Clip','Gospel','Noise','AlternRock','Bass','Soul','Punk','Space','Meditative','Instrumental Pop','Instrumental Rock','Ethnic','Gothic','Darkwave','Techno-Industrial','Electronic','Pop-Folk','Eurodance','Dream','Southern Rock','Comedy','Cult','Gangsta','Top 40','Christian Rap','Pop/Funk','Jungle','Native American','Cabaret','New Wave','Psychadelic','Rave','Showtunes','Trailer','Lo-Fi','Tribal','Acid Punk','Acid Jazz','Polka','Retro','Musical','Rock & Roll','Hard Rock','Unknown');

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TAG标签:	信息 支持 文件 音频 学习 源码 tmp if this-fd ret //