Recent comments

Reply to: reading .raw with LibRaw iProcessor example 2 years 8 months ago

procflags of open_bayer() should also do the swap for you in the above example: https://www.libraw.org/docs/API-CXX.html#open_bayer

Reply to: reading .raw with LibRaw iProcessor example 2 years 8 months ago

For byte swapping use

For byte swapping use something like ntohs() (actually this converts from big endian to your machine/host endianness, so it might be a noop if your machine is big endian as well) or, depending on your system/compiler, some incarnation of the bswap16() intrinsic/bultin function (e.g. __builtin_bswap16() for GCC, _byteswap_ushort() for MSVC, etc.)

Reply to: reading .raw with LibRaw iProcessor example 2 years 8 months ago

swapt little endian to big endian

Thank you again for your answers.
Actually, yes the data is encoded in int16.
I was able to read it in python swap bit ordering to bi endian. Any idea how I can achieve this in c++ ?
Also my guess for taking 2 bites with go for two consecutive bytes. Does this seam reasonable. I don' have all format specifications in hand.

Reply to: reading .raw with LibRaw iProcessor example 2 years 8 months ago

Also, if your file is 2 bytes

Also, if your file is 2 bytes per pixel, uncompressed, you do not need LibRaw to read source data values. Your values are already here (in unsigned short format, probably you may need big/little-endian swap; I know nothing about your images and your camera)

Reply to: reading .raw with LibRaw iProcessor example 2 years 8 months ago

If your input data is 16 bit

If your input data is 16 bit (2 bytes per pixel), 1,280,000 bytes is expected....

Reply to: reading .raw with LibRaw iProcessor example 2 years 8 months ago

open_bayer : bufferdouble of real values

Thank you Alex for your answer. I tried with open_bayer as I think the raw file has no metadata. With the code bellow I could see that readb as 1280000 values instead of 640000 for an image 800x8000. The final result with dcraw_process is not satisfactory. I wonder If and how I could retrieve the unpacked values and do the conversion myself.

FILE *in = fopen(fname, "rb");
	fseek(in, 0, SEEK_END);
	unsigned fsz = ftell(in);
	unsigned char *buffer = (unsigned char *)malloc(fsz);
	if (!buffer)
		return 2;
	fseek(in, 0, SEEK_SET);
	unsigned readb = fread(buffer, 1, fsz, in);
	if (readb != fsz)
		return 3;
	std::cout << "readb" << readb << std::endl;
	LibRaw rp;
	rp.imgdata.params.output_tiff = 1;
	int ret = rp.open_bayer(buffer, fsz, 800, 800, 0, 0, 0, 0, 0,
							LIBRAW_OPENBAYER_BGGR, 0, 0, 0);
	if (ret != LIBRAW_SUCCESS)
		return 4;
	if ((ret = rp.unpack()) != LIBRAW_SUCCESS)
		printf("Unpack error: %d\n", ret);
 
	if ((ret = rp.dcraw_process()) != LIBRAW_SUCCESS)
		printf("Processing error: %d\n", ret);
 
	char outfn[256];
	sprintf(outfn, "%s.tif", fname);
	if (LIBRAW_SUCCESS != (ret = rp.dcraw_ppm_tiff_writer(outfn)))
		printf("Cannot write %s: %s\n", outfn, libraw_strerror(ret));
	else
		printf("Created %s\n", outfn);
 
	ret = rp.dcraw_process();
	// Check for error using LIBRAW_SUCCESS. I never get an error here
 
	ret = rp.dcraw_ppm_tiff_writer(fname);

Reply to: reading .raw with LibRaw iProcessor example 2 years 8 months ago

-2 is: LIBRAW_FILE

-2 is: LIBRAW_FILE_UNSUPPORTED

If your 'raw' file is just a sensor dump without metadata consider using open_bayer() call