php读取flash文件高宽帧数背景颜色的方法

<?php
/*
示例：
? $file = '/data/ad_files/5/5.swf';
? $flash = new flash();
? $flash = $flash->getswfinfo($file);
? echo "
文件的宽高是:".$flash["width"].":".$info["height"];
? echo "
文件版本是".$flash["version"];
? echo "
文件帧数量是".$flash["framecount"];
? echo "
文件帧速率是".$flash["framerate"];
? echo "
文件背景颜色是".$flash["bgcolor"];
*/
class flash
{
? //是否返回背景色
? public $need_back_color = false ;
??
? //是否返回版本
? public $need_version = false ;
??
? //是否返回帧速率
? public $need_framerate = false ;
??
? //是否返回帧数量
? public $need_framecount = false ;
? public function __construct()?
? {
? }
? public function getswfinfo( $filename )
? {
??? if ( file_exists($filename) ) {
?????? //echo "文件的修改时间:".date("m d y h:i:s.",filemtime($filename))."
";
??? } else {
?????? //echo "目标文件不存在!";
?????? return array( "error" => $filename ) ;
??? }
??? //打开文件
??? $rs = fopen($filename,"r");
????
??? //读取文件的数据
??? $str = fread( $rs,filesize( $filename ) ) ;
??? ///
??? if($str[0] == "f")
??? {
?????? //echo "
文件已是解压缩的文件:";
??? } else {
?????? $first = substr($str,8);
?????? $last = substr($str,8);
?????? //
?????? $last = gzuncompress($last);
?????? //
?????? $str = $first . $last ;
?????? $str[0] = "f";
?????? //echo "
解压缩后的文件信息:";
??? }
??? $info = $this->getinfo( $str );
??? fclose ( $rs ) ;
??? return $info;
? }
? private function mydecbin($str,$index)
? {
??? $fbin = decbin(ord($str[$index]));
??? while(strlen($fbin)<8)$fbin="0".$fbin;
??? return $fbin;
? }
? private function colorhex($data)
? {
??? $tmp = dechex($data);
??? if ( strlen($tmp)<2 ) {
????? $tmp='0' . $tmp ;
??? }
??? return $tmp;
? }
? private function getinfo( $str )
? {
??? //换算成二进制
??? $fbin = $this->mydecbin( $str,8 ) ;
????
??? //计算rec的单位长度
??? $slen = bindec( substr( $fbin,5 ) );
????
??? //计算rec所在的字节
??? $recsize = $slen * 4 + 5 ;
??? $recsize = ceil( $recsize / 8 ) ;
??? //rec的二进制
??? $recbin = $fbin ;
??? for( $i = 9 ; $i < $recsize + 8 ; $i++ )
??? {
?????? $recbin .= $this->mydecbin( $str,$i );
??? }
??? //rec数据
??? $rec = array();
??? for( $i = 0 ; $i < 4 ; $i++ )
??? {
?????? $rec[] = bindec( substr( $recbin,5 + $i * $slen,$slen ) ) / 20;
??? }
????
??? if ( $this->need_back_color ) {
????? //背景颜色
????? for( $i = $recsize + 12 ; $i < strlen ( $str ) ; $i ++ )
????? {
???????? if ( ord( $str[$i] ) == 67 && ord( $str[$i+1] ) == 2 )
???????? {
????????? $bgcolor = $this->colorhex(ord($str[$i+2])).$this->colorhex(ord($str[$i+3])).$this->colorhex(ord($str[$i+4]));
????????? break;
???????? }
????? }
??? }
????
??? if ( $this->need_version ) {
????? //版本
????? $version = ord( $str[3] );
??? }
??? if ( $this->need_framerate ) {
????? //帧速率
????? $framerate = ord( $str[$recsize + 8] ) / 256 + ord( $str[$recsize + 9] ) ;
??? }
??? if ( $this->need_framecount ) {????
????? //帧数量
????? $framecount = ord( $str[$recsize + 11] ) * 256 + ord( $str[$recsize + 10] );
??? }
????
??? return? array ( "bgcolor" => $bgcolor,
??????????? "version" => $version,?
??????????? "framerate" => $framerate,?
??????????? "framecount" => $framecount,?
??????????? 'width'=>$rec[1],
??????????? 'height'=>$rec[3]
??????????? );
? }
}
?>