/**
* @param string $filename path to wav-file
*
* @return AudioFile
* @throws FileIsNotExistsException
* @throws FileIsNotReadableException
* @throws FileIsNotWavFileException
*/
public static function fromFile($filename)
{
if (!file_exists($filename)) {
throw new FileIsNotExistsException('File "' . $filename . '" is not exists.');
}
if (!is_readable($filename)) {
throw new FileIsNotReadableException('File "' . $filename . '" is not readable"');
}
if (is_dir($filename)) {
throw new FileIsNotWavFileException('File "' . $filename . '" is not a wav-file');
}
$size = filesize($filename);
if ($size < AudioFile::HEADER_LENGTH) {
throw new FileIsNotWavFileException('File "' . $filename . '" is not a wav-file');
}
$handle = fopen($filename, 'rb');
try {
$header = Header::createFromArray(self::parseHeader($handle));
$formatSection = FormatSection::createFromArray(self::parseFormatSection($handle));
$dataSection = DataSection::createFromArray(self::parseDataSection($handle));
} finally {
fclose($handle);
}
return new AudioFile($header, $formatSection, $dataSection);
}
/**
* @return AudioFile
*/
public function build()
{
$raw = '';
foreach ($this->samples as $sample) {
$raw .= $sample->getData();
}
$data = DataSection::createFromRaw($raw);
$format = FormatSection::createFromParameters(['audioFormat' => $this->audioFormat, 'numberOfChannels' => $this->numberOfChannels, 'sampleRate' => $this->sampleRate, 'byteRate' => $this->byteRate, 'blockAlign' => $this->blockAlign, 'bitsPerSample' => $this->bitsPerSample]);
$header = Header::createFromDataSection($data);
return new AudioFile($header, $format, $data);
}
/**
* @return int
*/
public function getBitsPerSample()
{
return $this->formatSection->getBitsPerSample();
}
