android: jpeg: exif: Add functions for setting various values

Add functions for setting the following EXIF fields:

- GPSDatestamp
- GPSTimestamp
- GPSLocation
  - GPSLatitudeRef
  - GPSLatitude
  - GPSLongitudeRef
  - GPSLongitude
  - GPSAltitudeRef
  - GPSAltitude
- GPSProcessingMethod
- FocalLength
- ExposureTime
- FNumber
- ISO
- Flash
- WhiteBalance
- SubsecTime
- SubsecTimeOriginal
- SubsecTimeDigitized

These are in preparation for fixing the following CTS tests:

- android.hardware.camera2.cts.StillCaptureTest#testFocalLengths
- android.hardware.camera2.cts.StillCaptureTest#testJpegExif

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

1 files changed, 38 insertions, 1 deletions

diff --git a/src/android/jpeg/exif.h b/src/android/jpeg/exif.h
index 8b84165b..b0d61402 100644
--- a/src/android/jpeg/exif.h
+++ b/src/android/jpeg/exif.h
@@ -7,6 +7,7 @@
 #ifndef __ANDROID_JPEG_EXIF_H__
 #define __ANDROID_JPEG_EXIF_H__
 
+#include <chrono>
 #include <string>
 #include <time.h>
 
@@ -26,6 +27,27 @@ public:
 		JPEG = 6,
 	};
 
+	enum Flash {
+		/* bit 0 */
+		Fired = 0x01,
+		/* bits 1 and 2 */
+		StrobeDetected = 0x04,
+		StrobeNotDetected = 0x06,
+		/* bits 3 and 4 */
+		ModeCompulsoryFiring = 0x08,
+		ModeCompulsorySuppression = 0x10,
+		ModeAuto = 0x18,
+		/* bit 5 */
+		FlashNotPresent = 0x20,
+		/* bit 6 */
+		RedEye = 0x40,
+	};
+
+	enum WhiteBalance {
+		Auto = 0,
+		Manual = 1,
+	};
+
 	enum StringEncoding {
 		NoEncoding = 0,
 		ASCII = 1,
@@ -39,7 +61,18 @@ public:
 	void setSize(const libcamera::Size &size);
 	void setThumbnail(libcamera::Span<const unsigned char> thumbnail,
 			  Compression compression);
-	void setTimestamp(time_t timestamp);
+	void setTimestamp(time_t timestamp, std::chrono::milliseconds msec);
+
+	void setGPSDateTimestamp(time_t timestamp);
+	void setGPSLocation(const double *coords);
+	void setGPSMethod(const std::string &method);
+
+	void setFocalLength(float length);
+	void setExposureTime(uint64_t nsec);
+	void setAperture(float size);
+	void setISO(uint16_t iso);
+	void setFlash(Flash flash);
+	void setWhiteBalance(WhiteBalance wb);
 
 	libcamera::Span<const uint8_t> data() const { return { exifData_, size_ }; }
 	[[nodiscard]] int generate();
@@ -49,6 +82,7 @@ private:
 	ExifEntry *createEntry(ExifIfd ifd, ExifTag tag, ExifFormat format,
 			       unsigned long components, unsigned int size);
 
+	void setByte(ExifIfd ifd, ExifTag tag, uint8_t item);
 	void setShort(ExifIfd ifd, ExifTag tag, uint16_t item);
 	void setLong(ExifIfd ifd, ExifTag tag, uint32_t item);
 	void setString(ExifIfd ifd, ExifTag tag, ExifFormat format,
@@ -56,6 +90,9 @@ private:
 		       StringEncoding encoding = NoEncoding);
 	void setRational(ExifIfd ifd, ExifTag tag, ExifRational item);
 
+	std::tuple<int, int, int> degreesToDMS(double decimalDegrees);
+	void setGPSDMS(ExifIfd ifd, ExifTag tag, int deg, int min, int sec);
+
 	std::u16string utf8ToUtf16(const std::string &str);
 
 	bool valid_;