php如何获取mp3音频信息

PHP简述

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PHP即“超文本预处理器”,是一种通用开源脚本语言。PHP是在服务器端执行的脚本语言,与C语言类似,是常用的网站编程语言。根据动态网站要求,PHP语言作为一种语言程序,其专用性逐渐在应用过程中显现,其技术水平的优劣与否将直接影响网站的运行效率。其特点是具有公开的源代码, 在程序设计上与通用型语言,如C语言相似性较高,因此在操作过程中简单易懂,可操作性强。

php获取mp3音频信息

很早之前在网上看到一个获取 MP3 音频信息的 php 类。如:播放时长、文件大小、文件编码等等

powarr  = array(0=>1,1=>2,2=>4,3=>8,4=>16,5=>32,6=>64,7=>128);
        $this->blockmax= 1024;
        
        $this->mp3data = array();
        $this->mp3data['Filesize'] = filesize($filename);
        $this->fd = fopen($filename,'rb');
        $this->prefetchblock();
        $this->readmp3frame();
    }
    public function __destruct()
    {
        fclose($this->fd);
    }
    //-------------------
    public function get_metadata()
    {
        return $this->mp3data;
    }
    protected function readmp3frame()
    {
        $iscbrmp3=true;
        if ($this->startswithid3())
            $this->skipid3tag();
        else if ($this->containsvbrxing())
        {
            $this->mp3data['Encoding'] = 'VBR';
            $iscbrmp3=false;
        }
        else if ($this->startswithpk())
        {
            $this->mp3data['Encoding'] = 'Unknown';
            $iscbrmp3=false;
        }
    
        if ($iscbrmp3)
        {
            $i = 0;
            $max=5000;
            //look in 5000 bytes... 
            //the largest framesize is 4609bytes(256kbps@8000Hz  mp3)
            for($i=0; $i<$max; $i++)
            {
                //looking for 1111 1111 111 (frame synchronization bits)                
                if ($this->getnextbyte()==0xFF)
                    if ($this->getnextbit() && $this->getnextbit() && $this->getnextbit())
                        break;
            }
            if ($i==$max)
                $iscbrmp3=false;
        }
    
        if ($iscbrmp3)
        {
            $this->mp3data['Encoding'         ] = 'CBR';
            $this->mp3data['MPEG version'     ] = $this->getnextbits(2);
            $this->mp3data['Layer Description'] = $this->getnextbits(2);
            $this->mp3data['Protection Bit'   ] = $this->getnextbits(1);
            $this->mp3data['Bitrate Index'    ] = $this->getnextbits(4);
            $this->mp3data['Sampling Freq Idx'] = $this->getnextbits(2);
            $this->mp3data['Padding Bit'      ] = $this->getnextbits(1);
            $this->mp3data['Private Bit'      ] = $this->getnextbits(1);
            $this->mp3data['Channel Mode'     ] = $this->getnextbits(2);
            $this->mp3data['Mode Extension'   ] = $this->getnextbits(2);
            $this->mp3data['Copyright'        ] = $this->getnextbits(1);
            $this->mp3data['Original Media'   ] = $this->getnextbits(1);
            $this->mp3data['Emphasis'         ] = $this->getnextbits(1);
            $this->mp3data['Bitrate'          ] = mp3file::bitratelookup($this->mp3data);
            $this->mp3data['Sampling Rate'    ] = mp3file::samplelookup($this->mp3data);
            $this->mp3data['Frame Size'       ] = mp3file::getframesize($this->mp3data);
            $this->mp3data['Length'           ] = mp3file::getduration($this->mp3data,$this->tell2());
            $this->mp3data['Length mm:ss'     ] = mp3file::seconds_to_mmss($this->mp3data['Length']);
            
            if ($this->mp3data['Bitrate'      ]=='bad'     ||
                $this->mp3data['Bitrate'      ]=='free'    ||
                $this->mp3data['Sampling Rate']=='unknown' ||
                $this->mp3data['Frame Size'   ]=='unknown' ||
                $this->mp3data['Length'     ]=='unknown')
            $this->mp3data = array('Filesize'=>$this->mp3data['Filesize'], 'Encoding'=>'Unknown');
        }
        else
        {
            if(!isset($this->mp3data['Encoding']))
                $this->mp3data['Encoding'] = 'Unknown';
        }
    }
    protected function tell()
    {
        return ftell($this->fd);
    }
    protected function tell2()
    {
        return ftell($this->fd)-$this->blockmax +$this->blockpos-1;
    }
    protected function startswithid3()
    {
        return ($this->block[1]==73 && //I
                $this->block[2]==68 && //D
                $this->block[3]==51);  //3
    }
    protected function startswithpk()
    {
        return ($this->block[1]==80 && //P
                $this->block[2]==75);  //K
    }
    protected function containsvbrxing()
    {
        //echo "";
        //echo "";
        return(
               ($this->block[37]==88  && //X 0x58
                $this->block[38]==105 && //i 0x69
                $this->block[39]==110 && //n 0x6E
                $this->block[40]==103)   //g 0x67
/*               || 
               ($this->block[21]==88  && //X 0x58
                $this->block[22]==105 && //i 0x69
                $this->block[23]==110 && //n 0x6E
                $this->block[24]==103)   //g 0x67*/
              );   
    } 
    protected function debugbytes()
    {
        for($j=0; $j<10; $j++)
        {
            for($i=0; $i<8; $i++)
            {
                if ($i==4) echo " ";
                echo $this->getnextbit();
            }
            echo "
"; } } protected function prefetchblock() { $block = fread($this->fd, $this->blockmax); $this->blocksize = strlen($block); $this->block = unpack("C*", $block); $this->blockpos=0; } protected function skipid3tag() { $bits=$this->getnextbits(24);//ID3 $bits.=$this->getnextbits(24);//v.v flags //3 bytes 1 version byte 2 byte flags $arr = array(); $arr['ID3v2 Major version'] = bindec(substr($bits,24,8)); $arr['ID3v2 Minor version'] = bindec(substr($bits,32,8)); $arr['ID3v2 flags' ] = bindec(substr($bits,40,8)); if (substr($bits,40,1)) $arr['Unsynchronisation']=true; if (substr($bits,41,1)) $arr['Extended header']=true; if (substr($bits,42,1)) $arr['Experimental indicator']=true; if (substr($bits,43,1)) $arr['Footer present']=true; $size = ""; for($i=0; $i<4; $i++) { $this->getnextbit();//skip this bit, should be 0 $size.= $this->getnextbits(7); } $arr['ID3v2 Tags Size']=bindec($size);//now the size is in bytes; if ($arr['ID3v2 Tags Size'] - $this->blockmax>0) { fseek($this->fd, $arr['ID3v2 Tags Size']+10 ); $this->prefetchblock(); if (isset($arr['Footer present']) && $arr['Footer present']) { for($i=0; $i<10; $i++) $this->getnextbyte();//10 footer bytes } } else { for($i=0; $i<$arr['ID3v2 Tags Size']; $i++) $this->getnextbyte(); } } protected function getnextbit() { if ($this->bitpos==8) return false; $b=0; $whichbit = 7-$this->bitpos; $mult = $this->powarr[$whichbit]; //$mult = pow(2,7-$this->pos); $b = $this->block[$this->blockpos+1] & $mult; $b = $b >> $whichbit; $this->bitpos++; if ($this->bitpos==8) { $this->blockpos++; if ($this->blockpos==$this->blockmax) //end of block reached { $this->prefetchblock(); } else if ($this->blockpos==$this->blocksize) {//end of short block reached (shorter than blockmax) return;//eof } $this->bitpos=0; } return $b; } protected function getnextbits($n=1) { $b=""; for($i=0; $i<$n; $i++) $b.=$this->getnextbit(); return $b; } protected function getnextbyte() { if ($this->blockpos>=$this->blocksize) return; $this->bitpos=0; $b=$this->block[$this->blockpos+1]; $this->blockpos++; return $b; } //----------------------------------------------------------------------------- public static function is_layer1(&$mp3) { return ($mp3['Layer Description']=='11'); } public static function is_layer2(&$mp3) { return ($mp3['Layer Description']=='10'); } public static function is_layer3(&$mp3) { return ($mp3['Layer Description']=='01'); } public static function is_mpeg10(&$mp3) { return ($mp3['MPEG version']=='11'); } public static function is_mpeg20(&$mp3) { return ($mp3['MPEG version']=='10'); } public static function is_mpeg25(&$mp3) { return ($mp3['MPEG version']=='00'); } public static function is_mpeg20or25(&$mp3) { return ($mp3['MPEG version']{1}=='0'); } //----------------------------------------------------------------------------- public static function bitratelookup(&$mp3) { //bits V1,L1 V1,L2 V1,L3 V2,L1 V2,L2&L3 $array = array(); $array['0000']=array('free','free','free','free','free'); $array['0001']=array( '32', '32', '32', '32', '8'); $array['0010']=array( '64', '48', '40', '48', '16'); $array['0011']=array( '96', '56', '48', '56', '24'); $array['0100']=array( '128', '64', '56', '64', '32'); $array['0101']=array( '160', '80', '64', '80', '40'); $array['0110']=array( '192', '96', '80', '96', '48'); $array['0111']=array( '224', '112', '96', '112', '56'); $array['1000']=array( '256', '128', '112', '128', '64'); $array['1001']=array( '288', '160', '128', '144', '80'); $array['1010']=array( '320', '192', '160', '160', '96'); $array['1011']=array( '352', '224', '192', '176', '112'); $array['1100']=array( '384', '256', '224', '192', '128'); $array['1101']=array( '416', '320', '256', '224', '144'); $array['1110']=array( '448', '384', '320', '256', '160'); $array['1111']=array( 'bad', 'bad', 'bad', 'bad', 'bad'); $whichcolumn=-1; if (mp3file::is_mpeg10($mp3) && mp3file::is_layer1($mp3) )//V1,L1 $whichcolumn=0; else if (mp3file::is_mpeg10($mp3) && mp3file::is_layer2($mp3) )//V1,L2 $whichcolumn=1; else if (mp3file::is_mpeg10($mp3) && mp3file::is_layer3($mp3) )//V1,L3 $whichcolumn=2; else if (mp3file::is_mpeg20or25($mp3) && mp3file::is_layer1($mp3) )//V2,L1 $whichcolumn=3; else if (mp3file::is_mpeg20or25($mp3) && (mp3file::is_layer2($mp3) || mp3file::is_layer3($mp3)) ) $whichcolumn=4;//V2, L2||L3 if (isset($array[$mp3['Bitrate Index']][$whichcolumn])) return $array[$mp3['Bitrate Index']][$whichcolumn]; else return "bad"; } //----------------------------------------------------------------------------- public static function samplelookup(&$mp3) { //bits MPEG1 MPEG2 MPEG2.5 $array = array(); $array['00'] =array('44100','22050','11025'); $array['01'] =array('48000','24000','12000'); $array['10'] =array('32000','16000','8000'); $array['11'] =array('res','res','res'); $whichcolumn=-1; if (mp3file::is_mpeg10($mp3)) $whichcolumn=0; else if (mp3file::is_mpeg20($mp3)) $whichcolumn=1; else if (mp3file::is_mpeg25($mp3)) $whichcolumn=2; if (isset($array[$mp3['Sampling Freq Idx']][$whichcolumn])) return $array[$mp3['Sampling Freq Idx']][$whichcolumn]; else return 'unknown'; } //----------------------------------------------------------------------------- public static function getframesize(&$mp3) { if ($mp3['Sampling Rate']>0) { return ceil((144 * $mp3['Bitrate']*1000)/$mp3['Sampling Rate']) + $mp3['Padding Bit']; } return 'unknown'; } //----------------------------------------------------------------------------- public static function getduration(&$mp3,$startat) { if ($mp3['Bitrate']>0) { $KBps = ($mp3['Bitrate']*1000)/8; $datasize = ($mp3['Filesize'] - ($startat/8)); $length = $datasize / $KBps; return sprintf("%d", $length); } return "unknown"; } //----------------------------------------------------------------------------- public static function seconds_to_mmss($duration) { return sprintf("%d:%02d", ($duration /60), $duration %60 ); } }

调用

get_metadata();
   return $a['Length mm:ss'] ? $a['Length mm:ss'] : 0;
}
function mp3Info($file) {
   $m = new mp3file($file);
   return $m->get_metadata();
}
$_time = mp3Time('Beyond-情人.mp3');
echo "歌曲时间长:{$_time}\n";
$_info = mp3Info('Beyond-情人.mp3');
print_r($_info);

输出信息

→ php mp3.php
歌曲时间长:5:15
Array
(
    [Filesize] => 7576152
    [Encoding] => CBR
    [MPEG version] => 11
    [Layer Description] => 01
    [Protection Bit] => 1
    [Bitrate Index] => 1011
    [Sampling Freq Idx] => 00
    [Padding Bit] => 0
    [Private Bit] => 0
    [Channel Mode] => 00
    [Mode Extension] => 00
    [Copyright] => 0
    [Original Media] => 1
    [Emphasis] => 0
    [Bitrate] => 192
    [Sampling Rate] => 44100
    [Frame Size] => 627
    [Length] => 315
    [Length mm:ss] => 5:15
)

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