Get the length of an audio file php

How I can get the length of an audio file in php.

If it's too hard to do in php t开发者_开发百科hen any other way should work alright.

If you're using linux / unix and have ffmpeg installed, just do this:

$time = exec("ffmpeg -i " . escapeshellarg($path) . " 2>&1 | grep 'Duration' | cut -d ' ' -f 4 | sed s/,//");
list($hms, $milli) = explode('.', $time);
list($hours, $minutes, $seconds) = explode(':', $hms);
$total_seconds = ($hours * 3600) + ($minutes * 60) + $seconds;

An improvement of Stephen Fuhry's answer:

/**
 * https://stackoverflow.com/a/7135484/470749
 * @param string $path
 * @return int
 */
function getDurationOfWavInMs($path) {
    $time = getDurationOfWav($path);
    list($hms, $milli) = explode('.', $time);
    list($hours, $minutes, $seconds) = explode(':', $hms);
    $totalSeconds = ($hours * 3600) + ($minutes * 60) + $seconds;
    return ($totalSeconds * 1000) + $milli;
}

/**
 * 
 * @param string $path
 * @return string
 */
function getDurationOfWav($path) {
    $cmd = "ffmpeg -i " . escapeshellarg($path) . " 2>&1 | grep 'Duration' | cut -d ' ' -f 4 | sed s/,//";
    return exec($cmd);
}

Thanks, Stephen! This is working well for me (although it is slow for hundreds of files).

PHP has no standard audio support, you'll have to recompile PHP yourself, or you can use a tool to get the information:

You could use ffmpeg. Running ffmpeg as follows:

ffmpeg -i someAudio.mp3

will produce this output:

Input #0, mp3, from 'someAudio.mp3':
  Duration: 00:00:34.03, start: 0.000000, bitrate: 127 kb/s
    Stream #0.0: Audio: mp3, 48000 Hz, mono, s16, 128 kb/s

now you'll only need a regexp to parse the result.

What kind of audio file? mp3? wav? Anyway you will probably need some specific library. See: http://de.php.net/manual/en/refs.utilspec.audio.php

If you're dealing with wave files, you just need to divide the wave sample length with the sample rate and you can get the length of the audio in seconds.

If you/somebody want to measure mp3 duration, I found some piece of code, works nice and no extensions are needed

http://www.zedwood.com/article/php-calculate-duration-of-mp3

ctrl+v

<?php
$mp3file = new MP3File("npr_304314290.mp3");//http://www.npr.org/rss/podcast.php?id=510282
$duration1 = $mp3file->getDurationEstimate();//(faster) for CBR only
$duration2 = $mp3file->getDuration();//(slower) for VBR (or CBR)
echo "duration: $duration1 seconds"."\n";
echo "estimate: $duration2 seconds"."\n";
echo MP3File::formatTime($duration2)."\n";
?>

class:

<?php
class MP3File
{
protected $filename;
public function __construct($filename)
{
    $this->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);
}

//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);
}

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);
}
}

Lame is a 3rd party application you could consider.

LAME is a high quality MPEG Audio Layer III (MP3) encoder licensed under the LGPL.

Update in 2020: there are many PHP packages which process audio/video files and detect duration of them: https://packagist.org/?query=ffmpeg Most of them require ffmpeg to be installed in your dev/production environments.