/**
* {@inheritdoc}
*/
public function read()
{
$chunkID = BinaryReader::read($this->resource, 'a*', 4);
if ($chunkID !== 'RIFF') {
return false;
}
$this->riff->setChunkID($chunkID);
$this->riff->setChunkSize(BinaryReader::read($this->resource, 'V', 4));
$this->riff->setFormat(BinaryReader::read($this->resource, 'a*', 4));
$this->fmt->setSubchunk1ID(BinaryReader::read($this->resource, 'a*', 4));
$this->fmt->setSubchunk1Size(BinaryReader::read($this->resource, 'V', 4));
$this->fmt->setAudioFormat(BinaryReader::read($this->resource, 'v', 2));
$this->fmt->setNumChannels(BinaryReader::read($this->resource, 'v', 2));
$this->fmt->setSampleRate(BinaryReader::read($this->resource, 'V', 4));
$this->fmt->setByteRate(BinaryReader::read($this->resource, 'V', 4));
$this->fmt->setBlockAlign(BinaryReader::read($this->resource, 'v', 2));
$this->fmt->setBitsPerSample(BinaryReader::read($this->resource, 'v', 2));
$this->fmt->setExtraParamSize(0);
$this->fmt->setExtraParams(null);
if ($this->fmt->getAudioFormat() != 1) {
$this->fmt->setExtraParamSize(BinaryReader::read($this->resource, 'v', 2));
$this->fmt->setExtraParams(BinaryReader::read($this->resource, 'a*', $this->fmt->getExtraParamSize()));
}
$this->data->setSubchunk2ID(BinaryReader::read($this->resource, 'a*', 4));
$this->data->setSubchunk2Size(BinaryReader::read($this->resource, 'V', 4));
switch ($this->fmt->getAudioFormat()) {
case 1:
$this->fmt->setAudioFormat('PCM');
break;
case 2:
$this->fmt->setAudioFormat('Microsoft ADPCM');
break;
case 6:
$this->fmt->setAudioFormat('ITU G.711 a-law');
break;
case 7:
$this->fmt->setAudioFormat('ITU G.711 µ-law');
break;
case 17:
$this->fmt->setAudioFormat('IMA ADPCM');
break;
case 20:
$this->fmt->setAudioFormat('ITU G.723 ADPCM (Yamaha)');
break;
case 49:
$this->fmt->setAudioFormat('GSM 6.10');
break;
case 64:
$this->fmt->setAudioFormat('ITU G.721 ADPCM');
break;
case 80:
$this->fmt->setAudioFormat('MPEG');
break;
case 65536:
$this->fmt->setAudioFormat('Experimental');
break;
}
return $this;
}
/**
* @param int $width
* @param int $height
*/
public function run($width = self::WIDTH_DEFAULT, $height = self::HEIGHT_DEFAULT)
{
if (PHP_SAPI !== 'cli') {
throw new \RuntimeException('Only cli');
}
$this->wavReader->read();
$wavInfo = '';
if ($fmt = $this->wavReader->getFmt()) {
$wavInfo = vsprintf("AudioFormat: %s\tNumChannels: %s\tSampleRate: %s\tBitsPerSample:%s", [$fmt->getAudioFormat(), $fmt->getNumChannels(), $fmt->getSampleRate(), $fmt->getBitsPerSample()]);
}
$fourier = new FFT($this->dim);
$peak = 2147483648;
// pow(256, 4) / 2;
$half = $this->dim / 2;
// optimize cycle
while (true) {
$function = [];
for ($dimCounter = 0; $dimCounter < $this->dim; ++$dimCounter) {
$function[] = BinaryReader::read($this->resource, 'V', 4) / $peak;
}
$FFT = $fourier->fft($function);
$absFFT = $fourier->getAbsFFT($FFT);
$display = [];
// clear terminal
$this->render->renderLine("c");
// Wav information
$this->render->renderLine($wavInfo);
// Build matrix
// Scale only height
//
// ^ ^
// | * | *
// | * * to | ***
// |* * |*****
// +------> +------->
for ($y = 0; $y < $height; ++$y) {
for ($x = 0; $x < $half; ++$x) {
// scale by height
$value = (int) $absFFT[$x] / (max($absFFT) + 1.0E-5) * $height;
$display[$y][$x] = false;
for ($m = 0; $m <= $value; ++$m) {
$display[$m][$x] = true;
}
}
}
// TODO: Width scale
$this->render->render($display, $height, $half);
}
}
