public function defaultValueIfNotFound()
{
$this->assertNull(ExifData::fromFile($this->resourceAsFile('iptc-only.jpg'), null));
}
/**
* Returns an ExifData instance or NULL if this image does not contain
* EXIF Data
*
* @return img.util.ExifData
*/
public function exifData()
{
if (!($seg = $this->segmentsOf('img.io.ExifSegment'))) {
return null;
}
// Populate ExifData instance from ExifSegment's raw data
with($data = new ExifData(), $raw = $seg[0]->rawData());
$data->setFileName($this->source);
$data->setFileSize(-1);
$data->setMimeType('image/jpeg');
$data->setMake(null === ($l = self::lookup($raw, 'Make')) ? null : trim($l));
$data->setModel(null === ($l = self::lookup($raw, 'Model')) ? null : trim($l));
$data->setSoftware(null === ($l = self::lookup($raw, 'Software')) ? null : trim($l));
$exif = $raw['Exif_IFD_Pointer']['data'];
if ($sof = $this->segmentsOf('img.io.SOFNSegment')) {
$data->setWidth($sof[0]->width());
$data->setHeight($sof[0]->height());
} else {
$data->setWidth(self::lookup($exif, 'ExifImageWidth'));
$data->setHeight(self::lookup($exif, 'ExifImageLength'));
}
// Aperture is either a FNumber (use directly), otherwise calculate from value
if (null === ($a = self::lookup($exif, 'FNumber'))) {
if (null === ($a = self::lookup($exif, 'ApertureValue', 'MaxApertureValue'))) {
$data->setApertureFNumber(null);
} else {
sscanf($a, '%d/%d', $n, $frac);
$data->setApertureFNumber(sprintf('f/%.1F', exp($n / $frac * log(2) * 0.5)));
}
} else {
sscanf($a, '%d/%d', $n, $frac);
$data->setApertureFNumber(sprintf('f/%.1F', $n / $frac));
}
$data->setExposureTime(self::lookup($exif, 'ExposureTime'));
$data->setExposureProgram(self::lookup($exif, 'ExposureProgram'));
$data->setMeteringMode(self::lookup($exif, 'MeteringMode'));
$data->setIsoSpeedRatings(self::lookup($exif, 'ISOSpeedRatings'));
// Sometimes white balance is in MAKERNOTE - e.g. FUJIFILM's Finepix
if (null !== ($w = self::lookup($exif, 'WhiteBalance'))) {
$data->setWhiteBalance($w);
} else {
if (isset($exif['MakerNote']) && null !== ($w = self::lookup($exif['MakerNote']['data'], 'WhiteBalance'))) {
$data->setWhiteBalance($w);
} else {
$data->setWhiteBalance(null);
}
}
// Extract focal length. Some models store "80" as "80/1", rip off
// the divisor "1" in this case.
if (null !== ($l = self::lookup($exif, 'FocalLength'))) {
sscanf($l, '%d/%d', $n, $frac);
$data->setFocalLength(1 == $frac ? $n : $n . '/' . $frac);
} else {
$data->setFocalLength(null);
}
// Check for Flash and flashUsed keys
if (null !== ($f = self::lookup($exif, 'Flash'))) {
$data->setFlash($f);
} else {
$data->setFlash(null);
}
if (null !== ($date = self::lookup($exif, 'DateTimeOriginal', 'DateTimeDigitized', 'DateTime'))) {
$t = sscanf($date, '%4d:%2d:%2d %2d:%2d:%2d');
$data->setDateTime(new \util\Date(mktime($t[3], $t[4], $t[5], $t[1], $t[2], $t[0])));
}
if (null !== ($o = self::lookup($exif, 'Orientation'))) {
$data->setOrientation($o);
} else {
$data->setOrientation($data->width / $data->height > 1.0 ? 1 : 5);
}
return $data;
}
