问题是你的算法将数字写为文本。而一个.wav http://www.sonicspot.com/guide/wavefiles.html文件对数据二进制进行编码。
例如你可以使用pack
对数据进行分组。
$freqOfTone = 440;
$sampleRate = 44100;
$samplesCount = 80000;
$amplitude = 0.25 * 32768;
$w = 2 * pi() * $freqOfTone / $sampleRate;
$samples = array();
for ($n = 0; $n < $samplesCount; $n++) {
$samples[] = (int)($amplitude * sin($n * $w));
}
$srate = 44100; //sample rate
$bps = 16; //bits per sample
$Bps = $bps/8; //bytes per sample /// I EDITED
$str = call_user_func_array("pack",
array_merge(array("VVVVVvvVVvvVVv*"),
array(//header
0x46464952, //RIFF
160038, //File size
0x45564157, //WAVE
0x20746d66, //"fmt " (chunk)
16, //chunk size
1, //compression
1, //nchannels
$srate, //sample rate
$Bps*$srate, //bytes/second
$Bps, //block align
$bps, //bits/sample
0x61746164, //"data"
160000 //chunk size
),
$samples //data
)
);
$myfile = fopen("sine.wav", "wb") or die("Unable to open file!");
fwrite($myfile, $str);
fclose($myfile);
这会产生这个file http://s000.tinyupload.com/index.php?file_id=74719922293793666696.
请注意,您can't只需重用上面的标头即可。某些方面的硬编码有所不同(例如文件大小、通道数、比特率等)。但如果有人读到文档 http://www.sonicspot.com/guide/wavefiles.html,可以轻松地相应地修改标题。