PHP Gets Information About Audio Files_PHP Tutorial

PHP obtains relevant information of audio files

This article mainly introduces the relevant information of PHP obtaining relevant information of audio files. It is very practical. Friends in need can refer to it. Down.

Project requirements: There is now a function to upload audio files. After uploading, PHP needs to obtain the relevant information of the audio file, such as: duration, etc. Since this file is placed on the purchased space, there is no such thing as ffmpeg extension to handle it, can PHP get this information?

The following is an implementation of reading and writing audio file header information using PHP that was used in the project before, mainly for WMA and MP3 formats, for reference.

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// AudioExif.class.php // 用PHP进行音频文件头部信息的读取与写入 // 目前只支持 WMA 和 MP3 两种格式, 只支持常用的几个头部信息 // // 写入信息支持: Title(名称), Artist(艺术家), Copyright(版权), Description (描述) // Year(年代), Genre (流派), AlbumTitle (专辑标题) // 其中 mp3 和 wma 略有不同, 具体返回的信息还可能更多, 但只有以上信息可以被写入 // mp3 还支持 Track (曲目编号写入) // 对于 MP3 文件支持 ID3v1也支持ID3v2, 读取时优先 v2, 写入时总是会写入v1, 必要时写入v2 // // 用法说明: (由于 wma 使用 Unicode 存取, 故还需要 mb_convert_encoding() 扩展 // 返回数据及写入数据均为 ANSI 编码, 即存什么就显示什么 (中文_GB2312) // // require ('AudioExif.class.php'); // $AE = new AudioExif; // $file = '/path/to/test.mp3'; // // 1. 检查文件是否完整 (only for wma, mp3始终返回 true) // // $AE->CheckSize($file); // // 2. 读取信息, 返回值由信息组成的数组, 键名解释参见上方 // // print_r($AE->GetInfo($file)); // // 3. 写入信息, 第二参数是一个哈希数组, 键->值, 支持的参见上方的, mp3也支持 Track // 要求第一参数的文件路径可由本程序写入 // $pa = array('Title' => '新标题', 'AlbumTitle' => '新的专辑名称'); // $AE->SetInfo($file, $pa); // // 其它: 该插件花了不少时间搜集查找 wma及mp3 的文件格式说明文档与网页, 希望对大家有用. // 其实网上已经有不少类似的程序, 但对 wma 实在太少了, 只能在 win 平台下通过 M$ 的 // API 来操作, 而 MP3 也很少有可以在 unix/linux 命令行操作的, 所以特意写了这个模块 // // 如果发现 bug 或提交 patch, 或加以改进使它更加健壮, 请告诉我. // (You should be able to find reference materials on the Internet about the file format and structure of ID3 and Wma) // if (!extension_loaded('mbstring')){ trigger_error('PHP Extension module `mbstring` is required for AudioExif', E_USER_WARNING); return true; } // the Main Class class AudioExif{ // public vars var $_wma = false; var $_mp3 = false; // Construct function AudioExif() { // nothing to do } // check the filesize function CheckSize($file) { $handler = &$this->_get_handler($file); if (!$handler) return false; return $handler->check_size($file); } // get the infomations function GetInfo($file) { $handler = &$this->_get_handler($file); if (!$handler) return false; return $handler->get_info($file); } // write the infomations function SetInfo($file, $pa) { if (!is_writable($file)) { trigger_error('AudioExif: file `' . $file . '' can not be overwritten', E_USER_WARNING); return false; } $handler = &$this->_get_handler($file); if (!$handler) return false; return $handler->set_info($file, $pa); } // private methods function &_get_handler($file) { $ext = strtolower(strrchr($file, '.')); $ret = false; if ($ext == '.mp3') { // MP3 $ret = &$this->_mp3; if (!$ret) $ret = new _Mp3Exif(); } else if ($ext == '.wma') { // wma $ret = &$this->_wma; if (!$ret) $ret = new _WmaExif(); } else { // unknown trigger_error('AudioExif not supported `' . $ext . '' file.', E_USER_WARNING); } return $ret; } } // DBCS => gb2312 function dbcs_gbk($str) { // strip the last " $str = substr($str, 0, -2); return mb_convert_encoding($str, 'GBK', 'UCS-2LE'); } // gb2312 => DBCS function gbk_dbcs($str) { $str = mb_convert_encoding($str, 'UCS-2LE', 'GBK'); $str .= " return $str; } // file exif class _AudioExif { var $fd; var $head; var $head_off; var $head_buf; // init the file handler function _file_init($fpath, $write = false) { $mode = ($write ? 'rb ' : 'rb'); $this->fd = @fopen($fpath, $mode); if (!$this->fd) { trigger_error('AudioExif: `' . $fpath . '' can not be opened with mode `' . $mode . '`', E_USER_WARNING); return false; } $this->head = false; $this->head_off = 0; $this->head_buf = ''; return true; } // read buffer from the head_buf & move the off pointer function _read_head_buf($len) { if ($len $buf = substr($this->head_buf, $this->head_off, $len); $this->head_off = strlen($buf); return $buf; } // read one short value function _read_head_short() { $ord1 = ord(substr($this->head_buf, $this->head_off, 1)); $ord2 = ord(substr($this->head_buf, $this->head_off 1, 1)); $this->head_off = 2; return ($ord1 ($ord2 }   // save the file head function _file_save($head, $olen, $nlen = 0) { if ($nlen == 0) $nlen = strlen($head); if ($nlen == $olen) { // shorter flock($this->fd, LOCK_EX); fseek($this->fd, 0, SEEK_SET); fwrite($this->fd, $head, $nlen); flock($this->fd, LOCK_UN); } else { // longer, buffer required $stat = fstat($this->fd); $fsize = $stat['size'];   // buf required (4096?) 应该不会 nlen - olen > 4096 吧 $woff = 0; $roff = $olen;   // read first buffer flock($this->fd, LOCK_EX); fseek($this->fd, $roff, SEEK_SET); $buf = fread($this->fd, 4096);   // seek to start fseek($this->fd, $woff, SEEK_SET); fwrite($this->fd, $head, $nlen); $woff = $nlen;   // seek to woff & write the data do { $buf2 = $buf; $roff = 4096; if ($roff { fseek($this->fd, $roff, SEEK_SET); $buf = fread($this->fd, 4096); }   // save last buffer $len2 = strlen($buf2); fseek($this->fd, $woff, SEEK_SET); fwrite($this->fd, $buf2, $len2); $woff = $len2; } while ($roff ftruncate($this->fd, $woff); flock($this->fd, LOCK_UN); } }   // close the file function _file_deinit() { if ($this->fd) { fclose($this->fd); $this->fd = false; } } }   // wma class class _WmaExif extends _AudioExif { var $items1 = array('Title', 'Artist', 'Copyright', 'Description', 'Reserved'); var $items2 = array('Year', 'Genre', 'AlbumTitle');   // check file size (length) maybe invalid file function check_size($file) { $ret = false; if (!$this->_file_init($file)) return true; if ($this->_init_header()) { $buf = fread($this->fd, 24); $tmp = unpack('H32id/Vlen/H8unused', $buf); if ($tmp['id'] == '3626b2758e66cf11a6d900aa0062ce6c') { $stat = fstat($this->fd); $ret = ($stat['size'] == ($this->head['len'] $tmp['len'])); } } $this->_file_deinit(); return $ret; }   // set info (save the infos) function set_info($file, $pa) { // check the pa settype($pa, 'array'); if (!$this->_file_init($file, true)) return false; if (!$this->_init_header()) { $this->_file_deinit(); return false; }   // parse the old header & generate the new header $head_body = ''; $st_found = $ex_found = false; $head_num = $this->head['num']; while (($tmp = $this->_get_head_frame()) && ($head_num > 0)) { $head_num--; if ($tmp['id'] == '3326b2758e66cf11a6d900aa0062ce6c') { // Standard Info // 1-4 $st_found = true; $st_body1 = $st_body2 = ''; $lenx = unpack('v5', $this->_read_head_buf(10)); $tmp['len'] -= 34; // 10 24 for ($i = 0; $i items1); $i ) { $l = $lenx[$i 1]; $k = $this->items1[$i]; $tmp['len'] -= $l;   $data = $this->_read_head_buf($l); if (isset($pa[$k])) $data = gbk_dbcs($pa[$k]);   $st_body2 .= $data; $st_body1 .= pack('v', strlen($data)); } // left length if ($tmp['len'] > 0) $st_body2 .= $this->_read_head_buf($tmp['len']);   // save to head_body $head_body .= pack('H32VH8', $tmp['id'], strlen($st_body1 . $st_body2) 24, $tmp['unused']); $head_body .= $st_body1 . $st_body2;   $st_body2 .= $data; }   // save to head_body $head_body .= pack('H32Va4', '3326b2758e66cf11a6d900aa0062ce6c', strlen($st_body1 . $st_body2) 24, ''); $head_body .= $st_body1 . $st_body2; $this->head['num'] ; } // ex not found? if (!$ex_found) { $inum = 0; $et_body = ''; foreach ($this->items2 as $k) { $nbuf = gbk_dbcs('WM/' . $k); $vbuf = (isset($pa[$k]) ? gbk_dbcs($pa[$k]) : ""); $et_body .= pack('v', strlen($nbuf)) . $nbuf . pack('vv', 0, strlen($vbuf)) . $vbuf; $inum ; } $head_body .= pack('H32Va4v', '40a4d0d207e3d21197f000a0c95ea850', strlen($et_body) 26, '', $inum); $head_body .= $et_body; $this->head['num'] ; }   // after save $new_len = strlen($head_body) 30; $old_len = $this->head['len']; if ($new_len { $head_body .= str_repeat("