Edit two Exif fields

HostComputer exif field was replaced with CameraSerialNumber and IPTCNAA
field was replaced with ImageNumber.

src/drivers/elphel/sensor_common.c

@@ -153,7 +153,7 @@ static struct meta_offsets_t { // works like a cache to time save on looking for
 	int Image_DateTime;          // will have offset of the Exif_Image_DateTime data in meta page (Exif_Photo_SubSecTime should go immediately after in meta page)
 	int Photo_DateTimeOriginal;
 	int Photo_ExposureTime;
-	int Image_FrameNumber;
+	int Image_ImageNumber;
 	int Image_Orientation;
 	int Photo_MakerNote;
 	int PageNumber;
@@ -434,7 +434,7 @@ inline void updateIRQ_Exif(struct jpeg_ptr_t *jptr, struct interframe_params_t*
 	write_meta_irq(sensor_port, exif_meta_time_string, &meta_offsets.Photo_DateTimeOriginal,  Exif_Photo_DateTimeOriginal, 27);
 	write_meta_irq(sensor_port, exif_meta_time_string, &meta_offsets.Image_DateTime,  Exif_Image_DateTime, 20); // may use 27 if room is provided
 	putlong_meta_irq(sensor_port, get_imageParamsThis(sensor_port, P_EXPOS), &meta_offsets.Photo_ExposureTime,  Exif_Photo_ExposureTime);
-	putlong_meta_irq(sensor_port, get_imageParamsThis(sensor_port, P_FRAME), &meta_offsets.Image_FrameNumber,   Exif_Image_FrameNumber);
+	putlong_meta_irq(sensor_port, get_imageParamsThis(sensor_port, P_FRAME), &meta_offsets.Image_ImageNumber,   Exif_Image_ImageNumber);
 	//Exif_Photo_MakerNote
 	int global_flips=(get_imageParamsThis(sensor_port, P_FLIPH) & 1) | ((get_imageParamsThis(sensor_port, P_FLIPV)<<1)  & 2);
 	int extra_flips=0;

src/include/elphel/exifa.h

@@ -61,11 +61,10 @@ struct exif_dir_table_t {
 #define  Exif_Image_Software           0x00131
 #define  Exif_Image_DateTime           0x00132
 #define  Exif_Image_Artist             0x0013b
-#define  Exif_Image_HostComputer       0x0013c
+#define  Exif_Image_CameraSerialNumber 0x0c62f
 #define  Exif_Image_Orientation        0x00112
-// hack, reusing field to keep it protected
-#define  Exif_Image_IPTCNAA            0x083bb
-#define  Exif_Image_FrameNumber        0x083bb
+// used for frame number as defined in Exif specification
+#define  Exif_Image_ImageNumber        0x09211
 // used for sensor number
 #define  Exif_Image_PageNumber         0x00129
 
@@ -178,7 +177,7 @@ struct meta_CompassInfo_t {
 #define  Exif_GPSInfo_CompassPitch_Index        0x10
 #define  Exif_GPSInfo_CompassRollRef_Index      0x11
 #define  Exif_GPSInfo_CompassRoll_Index         0x12
-#define  Exif_Image_FrameNumber_Index           0x13
+#define  Exif_Image_ImageNumber_Index           0x13
 #define  Exif_Image_Orientation_Index           0x14
 #define  Exif_Image_PageNumber_Index            0x15
 #define  Exif_Photo_MakerNote_Index             0x16