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/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
* ipu3-unpack - Unpack IPU3 raw Bayer format to 16-bit Bayer
*
* Copyright 2018 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
*/
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
static void usage(char *argv0)
{
printf("Usage: %s input-file output-file\n", basename(argv0));
printf("Unpack the IPU3 raw Bayer format to 16-bit Bayer\n");
}
int main(int argc, char *argv[])
{
int in_fd;
int out_fd;
int ret;
if (argc != 3) {
usage(argv[0]);
return 1;
}
in_fd = open(argv[1], O_RDONLY);
if (in_fd == -1) {
fprintf(stderr, "Failed to open input file '%s': %s\n",
argv[1], strerror(errno));
return 1;
}
out_fd = open(argv[2], O_WRONLY | O_TRUNC | O_CREAT, 0644);
if (out_fd == -1) {
fprintf(stderr, "Failed to open output file '%s': %s\n",
argv[2], strerror(errno));
return 1;
}
while (1) {
uint8_t in_data[32];
uint8_t out_data[50];
unsigned int i;
ret = read(in_fd, in_data, 32);
if (ret == -1) {
fprintf(stderr, "Failed to read input data: %s\n",
strerror(errno));
goto done;
}
if (ret < 32) {
if (ret != 0)
fprintf(stderr, "%u bytes of stray data at end of input\n",
ret);
break;
}
for (i = 0; i < 25; ++i) {
unsigned int index = (i * 10) / 8;
unsigned int lsb_shift = (i * 10) % 8;
unsigned int msb_shift = 8 - lsb_shift;
uint16_t pixel;
pixel = ((in_data[index+1] << msb_shift) & 0x3ff)
| ((in_data[index+0] >> lsb_shift) & 0x3ff);
out_data[i*2+0] = (pixel >> 0) & 0xff;
out_data[i*2+1] = (pixel >> 8) & 0xff;
}
ret = write(out_fd, out_data, 50);
if (ret == -1) {
fprintf(stderr, "Failed to write output data: %s\n",
strerror(errno));
goto done;
}
}
done:
close(in_fd);
close(out_fd);
return ret ? 1 : 0;
}
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