uyvy8.c

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

#include "uyvy8.h"
#include "helpers.h"

int uyvy8_decode(char* filename, xs_image_t* im)
{
	int pix;
	FILE* f_in;
	uint8_t buf[4];
	xs_data_in_t* ptr_Y;
	xs_data_in_t* ptr_Cb;
	xs_data_in_t* ptr_Cr;

	if ((im->width <= 0) || (im->height <= 0))
	{
		fprintf(stderr, "uyvy_decode error: unknown image width/height\n");
		return -1;
	}
	
	f_in = fopen(filename, "rb");
	if (f_in == NULL)
		return -1;

	im->ncomps = 3;
	im->sx[0] = 1;
	im->sx[1] = im->sx[2] = 2;
	im->sy[0] = im->sy[1] = im->sy[2] = 1;
	if (im->depth == -1)
		im->depth = 8;
	if (!xs_allocate_image(im, false))
		return -1;
	ptr_Y = im->comps_array[0];
	ptr_Cb = im->comps_array[1];
	ptr_Cr = im->comps_array[2];

	for (pix = 0; pix < im->width * im->height / 2; pix++)
	{
		if (fread(buf, sizeof(uint8_t), 4, f_in) == 0)
			break;
		*ptr_Cb++ = buf[0];
		*ptr_Y++ = buf[1];
		*ptr_Cr++ = buf[2];
		*ptr_Y++ = buf[3];
	}
	fclose(f_in);
	return 0;
}

int uyvy8_encode(char* filename, xs_image_t* im)
{
	int file_len;
	FILE* f_out;
	uint8_t buf[4];
	xs_data_in_t* ptr_Y = im->comps_array[0];
	xs_data_in_t* ptr_Cb = im->comps_array[1];
	xs_data_in_t* ptr_Cr = im->comps_array[2];
	
	if (im->ncomps == 3)
	{
		if (im->sx[0] != 1 || im->sx[1] != 2 || im->sx[2] != 2 ||
			im->sy[0] != 1 || im->sy[1] != 1 || im->sy[2] != 1)
		{
			fprintf(stderr, "uyvy8 needs 422 image data\n");
			return -1;
		}
	}
	else
	{
		fprintf(stderr, "unsupported image layout, cannot save as UYVY8\n");
		return -1;
	}

	f_out = fopen(filename, "wb");
	if (f_out == NULL)
		return -1;

	file_len = im->width * im->height * sizeof(uint8_t) * 2;
	while (file_len > 0)
	{
		buf[0] = *ptr_Cb++;
		buf[1] = *ptr_Y++;
		buf[2] = *ptr_Cr++;
		buf[3] = *ptr_Y++;
		fwrite(buf, sizeof(uint8_t), 4, f_out);
		file_len -= 4*sizeof(uint8_t);
	}
	fclose(f_out);
	return 0;
}