android: jpeg: Support an initial set of EXIF metadata tags

Create a Exif object with various metadata tags set, just before
the encoder starts to encode the frame. The object is passed
directly as libcamera::Span<> to make sure EXIF tags can be set
in a single place i.e. in CameraDevice and the encoder only has
the job to write the data in the final output.

Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Signed-off-by: Umang Jain <email@uajain.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

src/android/jpeg/encoder.h

@@ -18,7 +18,8 @@ public:
 
 	virtual int configure(const libcamera::StreamConfiguration &cfg) = 0;
 	virtual int encode(const libcamera::FrameBuffer *source,
-			   const libcamera::Span<uint8_t> &destination) = 0;
+			   const libcamera::Span<uint8_t> &destination,
+			   const libcamera::Span<const uint8_t> &exifData) = 0;
 };
 
 #endif /* __ANDROID_JPEG_ENCODER_H__ */