是否有任何PHP功能可以提供MP3持续时间。我看了ID 3功能，但是我没有看到任何持续时间的东西，除此之外，id3是某种标签，它不会出现在所有MP3中，所以使用它没有任何意义。
答案 0 :(得分：29)
这应该对你有用，请注意getduration函数：http://www.zedwood.com/article/127/php-calculate-duration-of-mp3
答案 1 :(得分：26)
安装getid3，但如果您只需要持续时间，则可以删除除这些模块之外的所有模块：
使用以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
答案 2 :(得分：7)
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。
确保您的php中不限制php shell_exec。
// 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;
}
答案 3 :(得分：7)
我已经度过了这么多时间，但没有getID3（http://getid3.sourceforge.net/）来获取音频文件的持续时间。
1）首先使用以下链接下载getID3库：
https://github.com/JamesHeinrich/getID3/archive/master.zip
2）尝试以下代码：
<?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);
?>
答案 4 :(得分：3)
没有原生的php函数可以做到这一点。
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
答案 5 :(得分：3)
<?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";
?>
答案 6 :(得分：1)
MP3长度不存储在任何地方（采用“普通”MP3格式），因为MP3被设计为“分割”成帧，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，您需要做的是（有工具和PHP类这样做）是读取整个MP3文件并总结每帧的持续时间。
答案 7 :(得分：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
我希望这会对你有所帮助。
答案 8 :(得分：1)
最后，我用自己的计算开发了一个解决方案。此解决方案最适用于 mp3 和 WAV 文件格式。但是，预计会有微小的精度变化解决方案是 PHP 。我从WAV
中获取了一些线索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);
答案 9 :(得分：1)
如前所述，我为 mp3 和 WAV 文件提供了解决方案，现在此解决方案专门针对唯一的 WAV 文件精确度但评估时间比早期解决方案更长。
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);
答案 10 :(得分：0)
如果您安装了FFMpeg，则使用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);