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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <errno.h>
#include <assert.h>
#include <getopt.h>
#define IPE_DEFAULT_WIDTH 2048
char *strdup(const char *str)
{
int n = strlen(str) + 1;
char *dup = malloc(n);
if (dup)
strcpy(dup, str);
return dup;
}
int process_simple_frame(uint16_t *frame_in, uint16_t *frame_out, int width, int height)
{
const size_t row_size_bytes = width * sizeof(uint16_t);
for (int row = 0; row < height; row++) {
/* Copy one line */
memcpy(frame_out, frame_in + row*width, row_size_bytes);
frame_out += width;
/* Interpolate between source row and row+1 */
for (int x = 0; x < width; x++) {
frame_out[x] = (int) (0.5 * frame_in[row*width + x] + 0.5 * frame_in[(row+1)*width + x]);
}
frame_out += width;
}
/* Copy last row */
memcpy(frame_out, frame_in + width * (height - 1), row_size_bytes);
return 0;
}
int process_file(const char *filename, int width, int height, int num_lines_skipped)
{
FILE *fp = fopen(filename, "rb");
if (fp == NULL) {
return EIO;
}
fseek(fp, 0, SEEK_END);
const size_t file_size = ftell(fp);
rewind(fp);
uint16_t *frame_in_buffer = (uint16_t *) malloc(file_size);
if (frame_in_buffer == NULL) {
fclose(fp);
return ENOMEM;
}
size_t buffer_length = fread(frame_in_buffer, 1, file_size, fp);
fclose(fp);
if (buffer_length != file_size) {
free(frame_in_buffer);
return EIO;
}
uint16_t *frame_out_buffer = (uint16_t *) malloc(file_size * 2);
if (frame_out_buffer == NULL) {
fclose(fp);
return ENOMEM;
}
const int num_frames = file_size / (width * height * sizeof(uint16_t));
printf("de-interlacing %i frames...\n", num_frames);
for (int frame = 0; frame < num_frames; frame++) {
process_simple_frame(
frame_in_buffer + frame * (width * height),
frame_out_buffer + frame * (width * height * 2),
width, height);
}
fp = fopen("result.raw", "wb");
fwrite(frame_out_buffer, 1, file_size * 2, fp);
fclose(fp);
free(frame_in_buffer);
free(frame_out_buffer);
return 0;
}
int main(int argc, char const* argv[])
{
static struct option long_options[] = {
{ "width", 1, 0, 'w' },
{ "interlaced-height", 1, 0, 'i' },
{ "target-height", 1, 0, 't' },
{ "file", 1, 0, 'f' },
{ NULL, 0, NULL, 0 }
};
int c, option_index = 0, errnum;
int width = IPE_DEFAULT_WIDTH;
int interlaced_height = -1;
int target_height = -1;
char *file_name = NULL;
char *end;
while ((c = getopt_long(argc, (char *const *) argv, "w:i:t:f:", long_options, &option_index)) != -1) {
switch (c) {
case 'w':
width = (int) strtol(optarg, &end, 10);
break;
case 'i':
interlaced_height = (int) strtol(optarg, &end, 10);
break;
case 't':
target_height = (int) strtol(optarg, &end, 10);
break;
case 'f':
file_name = strdup( (char *) optarg);
break;
}
}
if (interlaced_height == -1 || file_name == NULL) {
printf("Usage: deinterlace --interlaced-height=[number] --target-height=[number] --file=[name]\n");
exit(EXIT_FAILURE);
}
if (target_height == -1)
target_height = interlaced_height * 2;
if ((errnum = process_file(file_name, width, interlaced_height, (target_height / interlaced_height) - 1)))
printf("Error occured: %s\n", strerror(errnum));
free(file_name);
return 0;
}
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