function extractGenerator($gen, $looptime)
{
global $sf;
$genOper = $gen['sfGenOper'];
if ($genOper === 41) {
// instrument
$instIdx = $gen['Amount'];
$inst = $sf->pdtaMap['inst'][$instIdx];
extractInstrument($inst, $looptime);
} else {
if ($genOper === 53) {
// sampleID
$sampleIdx = $gen['Amount'];
$sample = $sf->pdtaMap['shdr'][$sampleIdx];
echo IO_SoundFont_Sample::string($sample) . PHP_EOL;
//
$name = $sample['SampleName'];
$sampleRate = $sample['SampleRate'];
$start = $sample['Start'];
$end = $sample['End'];
$data = $sf->sfbk['sdta']['smpl']->data;
if (is_null($looptime)) {
$sampleData = substr($data, $start * 2, ($end - $start + 1) * 2);
} else {
$startLoop = $sample['StartLoop'];
$endLoop = $sample['EndLoop'];
$loopCount = $looptime * $sampleRate / ($endLoop - $startLoop);
$loopCount = ceil($loopCount);
// round up
$sampleData = substr($data, $start * 2, ($startLoop - $start) * 2);
$sampleData .= str_repeat(substr($data, $startLoop * 2, ($endLoop - $startLoop) * 2), $loopCount);
$sampleData .= substr($data, $endLoop * 2, ($end - $endLoop + 1) * 2);
}
$nChannel = 1;
// 1:monoral, 2:stereo
$sampleBits = 16;
// 8 or 16
$waveData = makeWaveData($sampleData, $nChannel, $sampleBits, $sampleRate);
file_put_contents($name . ".wav", $waveData);
}
}
}
function generatorTree($gen, $indentLevel)
{
$indentSpace = str_repeat(" ", $indentLevel);
echo $indentSpace . IO_SoundFont_Generator::string($gen) . PHP_EOL;
$genOper = $gen['sfGenOper'];
if ($genOper === 41) {
// instrument
$instIdx = $gen['Amount'];
$inst = $this->pdtaMap['inst'][$instIdx];
$this->instrumentTree($inst, $indentLevel + 1);
} else {
if ($genOper === 53) {
// sampleID
$sampleIdx = $gen['Amount'];
$sample = $this->pdtaMap['shdr'][$sampleIdx];
echo $indentSpace . IO_SoundFont_Sample::string($sample) . PHP_EOL;
}
}
}
