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PHP 获取mp3文件时长

         filename = $filename; } public static function formatTime($duration) //as hh:mm:ss { //return sprintf("%d:%02d", $duration/60, $duration%60); $hours = floor($duration / 3600); $minutes = floor( ($duration - ($hours * 3600)) / 60); $seconds = $duration - ($hours * 3600) - ($minutes * 60); // return sprintf("%02d:%02d:%02d", $hours, $minutes, $seconds); return array('hours'=>$hours, 'minutes'=>$minutes, 'seconds'=>$seconds); } //Read first mp3 frame only... use for CBR constant bit rate MP3s public function getDurationEstimate() { return $this->getDuration($use_cbr_estimate=true); } //Read entire file, frame by frame... ie: Variable Bit Rate (VBR) public function getDuration($use_cbr_estimate=false) { $fd = fopen($this->filename, "rb"); $duration=0; $block = fread($fd, 100); $offset = $this->skipID3v2Tag($block); fseek($fd, $offset, SEEK_SET); while (!feof($fd)) { $block = fread($fd, 10); if (strlen($block)<10) { break; } //looking for 1111 1111 111 (frame synchronization bits) else if ($block[0]=="\xff" && (ord($block[1])&0xe0) ) { $info = self::parseFrameHeader(substr($block, 0, 4)); if (empty($info['Framesize'])) { return $duration; } //some corrupt mp3 files fseek($fd, $info['Framesize']-10, SEEK_CUR); $duration += ( $info['Samples'] / $info['Sampling Rate'] ); } else if (substr($block, 0, 3)=='TAG') { fseek($fd, 128-10, SEEK_CUR);//skip over id3v1 tag size } else { fseek($fd, -9, SEEK_CUR); } if ($use_cbr_estimate && !empty($info)) { return $this->estimateDuration($info['Bitrate'],$offset); } } return round($duration*2); } private function estimateDuration($bitrate,$offset) { $kbps = ($bitrate*1000)/8; $datasize = filesize($this->filename) - $offset; return round($datasize / $kbps); } private function skipID3v2Tag(&$block) { if (substr($block, 0,3)=="ID3") { $id3v2_major_version = ord($block[3]); $id3v2_minor_version = ord($block[4]); $id3v2_flags = ord($block[5]); $flag_unsynchronisation = $id3v2_flags & 0x80 ? 1 : 0; $flag_extended_header = $id3v2_flags & 0x40 ? 1 : 0; $flag_experimental_ind = $id3v2_flags & 0x20 ? 1 : 0; $flag_footer_present = $id3v2_flags & 0x10 ? 1 : 0; $z0 = ord($block[6]); $z1 = ord($block[7]); $z2 = ord($block[8]); $z3 = ord($block[9]); if ( (($z0&0x80)==0) && (($z1&0x80)==0) && (($z2&0x80)==0) && (($z3&0x80)==0) ) { $header_size = 10; $tag_size = (($z0&0x7f) * 2097152) + (($z1&0x7f) * 16384) + (($z2&0x7f) * 128) + ($z3&0x7f); $footer_size = $flag_footer_present ? 10 : 0; return $header_size + $tag_size + $footer_size;//bytes to skip } } return 0; } public static function parseFrameHeader($fourbytes) { static $versions = array( 0x0=>'2.5',0x1=>'x',0x2=>'2',0x3=>'1', // x=>'reserved' ); static $layers = array( 0x0=>'x',0x1=>'3',0x2=>'2',0x3=>'1', // x=>'reserved' ); static $bitrates = array( 'V1L1'=>array(0,32,64,96,128,160,192,224,256,288,320,352,384,416,448), 'V1L2'=>array(0,32,48,56, 64, 80, 96,112,128,160,192,224,256,320,384), 'V1L3'=>array(0,32,40,48, 56, 64, 80, 96,112,128,160,192,224,256,320), 'V2L1'=>array(0,32,48,56, 64, 80, 96,112,128,144,160,176,192,224,256), 'V2L2'=>array(0, 8,16,24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160), 'V2L3'=>array(0, 8,16,24, 32, 40, 48, 56, 64, 80, 96,112,128,144,160), ); static $sample_rates = array( '1' => array(44100,48000,32000), '2' => array(22050,24000,16000), '2.5' => array(11025,12000, 8000), ); static $samples = array( 1 => array( 1 => 384, 2 =>1152, 3 =>1152, ), //MPEGv1, Layers 1,2,3 2 => array( 1 => 384, 2 =>1152, 3 => 576, ), //MPEGv2/2.5, Layers 1,2,3 ); //$b0=ord($fourbytes[0]);//will always be 0xff $b1=ord($fourbytes[1]); $b2=ord($fourbytes[2]); $b3=ord($fourbytes[3]); $version_bits = ($b1 & 0x18) >> 3; $version = $versions[$version_bits]; $simple_version = ($version=='2.5' ? 2 : $version); $layer_bits = ($b1 & 0x06) >> 1; $layer = $layers[$layer_bits]; $protection_bit = ($b1 & 0x01); $bitrate_key = sprintf('V%dL%d', $simple_version , $layer); $bitrate_idx = ($b2 & 0xf0) >> 4; $bitrate = isset($bitrates[$bitrate_key][$bitrate_idx]) ? $bitrates[$bitrate_key][$bitrate_idx] : 0; $sample_rate_idx = ($b2 & 0x0c) >> 2;//0xc => b1100 $sample_rate = isset($sample_rates[$version][$sample_rate_idx]) ? $sample_rates[$version][$sample_rate_idx] : 0; $padding_bit = ($b2 & 0x02) >> 1; $private_bit = ($b2 & 0x01); $channel_mode_bits = ($b3 & 0xc0) >> 6; $mode_extension_bits = ($b3 & 0x30) >> 4; $copyright_bit = ($b3 & 0x08) >> 3; $original_bit = ($b3 & 0x04) >> 2; $emphasis = ($b3 & 0x03); $info = array(); $info['Version'] = $version;//MPEGVersion $info['Layer'] = $layer; //$info['Protection Bit'] = $protection_bit; //0=> protected by 2 byte CRC, 1=>not protected $info['Bitrate'] = $bitrate; $info['Sampling Rate'] = $sample_rate; //$info['Padding Bit'] = $padding_bit; //$info['Private Bit'] = $private_bit; //$info['Channel Mode'] = $channel_mode_bits; //$info['Mode Extension'] = $mode_extension_bits; //$info['Copyright'] = $copyright_bit; //$info['Original'] = $original_bit; //$info['Emphasis'] = $emphasis; $info['Framesize'] = self::framesize($layer, $bitrate, $sample_rate, $padding_bit); $info['Samples'] = $samples[$simple_version][$layer]; return $info; } private static function framesize($layer, $bitrate,$sample_rate,$padding_bit) { if ($layer==1) return intval(((12 * $bitrate*1000 /$sample_rate) + $padding_bit) * 4); else //layer 2, 3 return intval(((144 * $bitrate*1000)/$sample_rate) + $padding_bit); } } ?>



 $mp3 = new MP3File("/var/spool/asterisk/monitor/$data/$other"); $a = $mp3->getDurationEstimate(); $billsec = $mp3->getDuration();


除非特别注明,本站所有文字均为原创文章,作者:luojie

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