samples/openbayer_sample.cpp

/* -*- C++ -*-
 * File: openvayer_sample.cpp
 * Copyright 2008-2025 LibRaw LLC (info@libraw.org)
 * Created: Feb 11, 2020
 *
 * LibRaw simple C++ API:  opens bayer data (Kodak KAI-0340 sensor) from buffer,
dump as 8-bit tiff

LibRaw is free software; you can redistribute it and/or modify
it under the terms of the one of two licenses as you choose:

1. GNU LESSER GENERAL PUBLIC LICENSE version 2.1
   (See file LICENSE.LGPL provided in LibRaw distribution archive for details).

2. COMMON DEVELOPMENT AND DISTRIBUTION LICENSE (CDDL) Version 1.0
   (See file LICENSE.CDDL provided in LibRaw distribution archive for details).

 */

#include <stdio.h>
#include <string.h>
#include <math.h>

#include "third_party/libraw/libraw/libraw.h"

#ifndef LIBRAW_WIN32_CALLS
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/mman.h>
#endif

int main(int ac, char *av[])
{
  if (ac != 2)
    return 1;
  FILE *in = fopen(av[1], "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;
  LibRaw rp;
  rp.imgdata.params.output_tiff = 1;
  int ret = rp.open_bayer(buffer, fsz, 640, 480, 0, 0, 0, 0, 0,
                          LIBRAW_OPENBAYER_RGGB, 0, 0, 1400);
  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", av[1]);
  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);
}