通過PHP讀取wav音頻時長

原創

2020-02-21 04:46

　　因爲一朋友需要獲取目錄下所有wav格式的音頻文件時長，讓我幫忙，開始打算通過linux命令寫的，找了半天沒有找到，只找到通過php實現的方法，核心算法是從網上借鑑，我修改了一下，不說太多，直接上代碼：

<?php

function getWavLength($file, $base=10) {
    $fp = fopen($file, 'r');
    if (fread($fp,4) != 'RIFF') {
        return '';
    }
    fseek($fp, 20);
    $rawheader = fread($fp, 16);
    $header = unpack('vtype/vchannels/Vsamplerate/Vbytespersec/valignment/vbits',$rawheader);
    $pos = ftell($fp);
    while (fread($fp, 4) != 'data' && !feof($fp)) {
        $pos++;
        fseek($fp,$pos);
    }
    $rawheader = fread($fp, 4);
    $data = unpack('Vdatasize',$rawheader);
    $sec = $data[datasize] / $header[bytespersec];
    if($base==60) {
        $seconds = intval($sec % 60);
        $minutes = intval(($sec - $sec * 60) / 60);
        return $minutes.':'.$seconds;
    } else {
        return $sec;
    }
}

$filePath = './wav/';
$arrWavData = array();
$arrWavData = scandir($filePath);
foreach ($arrWavData as $wavData) { 
    $lengh = getWavLength($filePath . $wavData);
    if (!empty($lengh)) {
        echo $wavData . ': ' . $lengh . "\n";
    }
}