36

是否有任何 PHP 函数可以为我提供 MP3 持续时间。我查看了 ID 3 功能，但我没有看到任何东西，除此之外，id3 是某种标签，在所有 MP3 中都不会存在，因此使用它没有任何意义。

4

11 回答 11

40

这应该对你有用，注意 getduration 函数：http ://www.zedwood.com/article/127/php-calculate-duration-of-mp3

于 2012-08-21T10:44:10.913 回答
27

安装getid3，但如果你只需要duration，你可以删除除这些模块之外的所有模块：

  • 模块.audio.mp3.php
  • module.tag.id3v1.php
  • module.tag.apetag.php
  • module.tag.id3v2.php

使用如下代码访问持续时间：

$getID3 = new getID3;
$ThisFileInfo = $getID3->analyze($pathName);
$len= @$ThisFileInfo['playtime_string']; // playtime in minutes:seconds, formatted string

在Sourceforge获取

于 2012-08-21T10:42:55.177 回答
14

我已经过了这么多时间，但没有 getID3 ( http://getid3.sourceforge.net/ ) 来获取音频文件的持续时间是不可能的。

1）首先使用以下链接下载getID3库：

 https://github.com/JamesHeinrich/getID3/archive/master.zip

2）试试下面的代码：

    <?php
       include("getid3/getid3.php");
       $filename = 'bcd4ecc6bf521da9b9a2d8b9616d1505.wav';
       $getID3 = new getID3;
       $file = $getID3->analyze($filename);
       $playtime_seconds = $file['playtime_seconds'];
       echo gmdate("H:i:s", $playtime_seconds);
    ?>
于 2017-05-13T05:57:58.950 回答
10

您可以使用 ffmpeg 获取 mp3 或许多其他音频/视频文件的持续时间。

  1. 在您的服务器中安装 ffmpeg。

  2. 确保 php shell_exec 在您的 php.ini 中不受限制。

        // Discriminate only the audio/video files you want
    if(preg_match('/[^?#]+\.(?:wma|mp3|wav|mp4)/', strtolower($file))){
        $filepath = /* your file path */;
        // execute ffmpeg form linux shell and grab duration from output
        $result = shell_exec("ffmpeg -i ".$filepath.' 2>&1 | grep -o \'Duration: [0-9:.]*\'');
        $duration = str_replace('Duration: ', '', $result); // 00:05:03.25

        //get the duration in seconds
        $timeArr = preg_split('/:/', str_replace('s', '', $duration[0]));
        $t = $this->_times[$file] = (($timeArr[3])? $timeArr[3]*1 + $timeArr[2] * 60 + $timeArr[1] * 60 * 60 : $timeArr[2] + $timeArr[1] * 60)*1000;

    }
于 2013-03-06T02:06:04.653 回答
4 
<?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;
    $info['Framesize'] = self::framesize($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);
}
}
?>
<?php
$mp3file = new MP3File("Chal_Halke.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";

?>
于 2017-04-21T06:14:59.873 回答
3

没有本机 php 函数可以执行此操作。

根据您的服务器环境，您可以使用MP3Info等工具。

$length = shell_exec('mp3info -p "%S" sample.mp3');   // total time in seconds
于 2012-08-21T10:44:45.377 回答
1

MP3 长度不会存储在任何地方（以“普通”MP3 格式），因为 MP3 被设计为“拆分”为帧，并且这些帧将保持可播放。

http://mpgedit.org/mpgedit/mpeg_format/mpeghdr.htm

如果您没有可依赖的 ID 标签，您需要做的（有执行此操作的工具和 PHP 类）是读取整个 MP3 文件并对每个帧的持续时间求和。

于 2012-08-21T10:47:24.970 回答
1 
$getID3 = new getID3;
$ThisFileInfo = $getID3->analyze($pathName);

// playtime in minutes:seconds, formatted string
$len = @$ThisFileInfo['playtime_string']; 

//don't get playtime_string, but get playtime_seconds
$len = @$ThisFileInfo['playtime_seconds']*1000; //*1000 as calculate millisecond

我希望这可以帮助你。

于 2014-08-27T13:31:42.207 回答
1

最后，我用自己的计算开发了一个解决方案。此解决方案最适合mp3和WAV文件格式。然而，预计会有微小的精度变化。解决方案是在PHP中。我从WAV中得到一点线索

function calculateFileSize($file){

    $ratio = 16000; //bytespersec

    if (!$file) {

        exit("Verify file name and it's path");

    }

    $file_size = filesize($file);

    if (!$file_size)
        exit("Verify file, something wrong with your file");

    $duration = ($file_size / $ratio);
    $minutes = floor($duration / 60);
    $seconds = $duration - ($minutes * 60);
    $seconds = round($seconds);
    echo "$minutes:$seconds minutes";

}

$file = 'apple-classic.mp3'; //Enter File Name mp3/wav
calculateFileSize($file);
于 2017-09-26T19:31:06.597 回答
1

如果您安装了 FFMpeg，使用 FFProbe 获取持续时间非常简单

$filepath = 'example.mp3';
$ffprobe = \FFMpeg\FFProbe::create();
$duration = $ffprobe->format($filepath)->get('duration');

echo gmdate('H:i:s', $duration);
于 2019-09-12T18:25:21.127 回答
1

如前所述，我为mp3和WAV文件提供了一个解决方案，现在这个解决方案专门针对唯一一个比早期解决方案更精确但评估时间更长的WAV文件。

function calculateWavDuration( $file ) {

    $fp = fopen($file, 'r');

    if (fread($fp, 4) == "RIFF") {

        fseek($fp, 20);
        $raw_header = fread($fp, 16);
        $header = unpack('vtype/vchannels/Vsamplerate/Vbytespersec/valignment/vbits', $raw_header);
        $pos = ftell($fp);

        while (fread($fp, 4) != "data" && !feof($fp)) {

            $pos++;
            fseek($fp, $pos);

        }

        $raw_header = fread($fp, 4);
        $data = unpack('Vdatasize', $raw_header);
        $sec = $data[datasize] / $header[bytespersec];
        $minutes = intval(($sec / 60) % 60);
        $seconds = intval($sec % 60);

        return str_pad($minutes, 2, "0", STR_PAD_LEFT) . ":" . str_pad($seconds, 2, "0", STR_PAD_LEFT);

    }

}

$file = '1.wav'; //Enter File wav
calculateWavDuration($file);
于 2017-09-26T19:59:48.863 回答