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/* See LICENSE file for copyright and license details. */
#include <arpa/inet.h>
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <jpeglib.h>
#include "util.h"
static void
jpeg_error(j_common_ptr js)
{
fprintf(stderr, "%s: libjpeg: ", argv0);
(*js->err->output_message)(js);
exit(1);
}
static void
jpeg_setup_reader(struct jpeg_decompress_struct *s, struct jpeg_error_mgr *e,
uint32_t *w, uint32_t *h)
{
jpeg_create_decompress(s);
e->error_exit = jpeg_error;
s->err = jpeg_std_error(e);
jpeg_stdio_src(s, stdin);
jpeg_read_header(s, 1);
*w = s->image_width;
*h = s->image_height;
s->output_components = 3; /* color components per pixel */
s->out_color_space = JCS_RGB; /* input color space */
jpeg_start_decompress(s);
}
static void
usage(void)
{
die("usage: %s", argv0);
}
int
main(int argc, char *argv[])
{
struct jpeg_decompress_struct js;
struct jpeg_error_mgr jerr;
uint32_t width, height;
uint16_t *row;
uint8_t *rowin;
size_t rowlen, i;
/* arguments */
argv0 = argv[0], argc--, argv++;
if (argc) {
usage();
}
/* prepare */
jpeg_setup_reader(&js, &jerr, &width, &height);
row = ereallocarray(NULL, width, (sizeof("RGBA") - 1) * sizeof(uint16_t));
rowlen = width * (sizeof("RGBA") - 1);
rowin = ereallocarray(NULL, width, (sizeof("RGB") - 1) * sizeof(uint8_t));
/* write data */
ff_write_header(width, height);
while (js.output_scanline < js.output_height) {
jpeg_read_scanlines(&js, &rowin, 1);
for (i = 0; i < width; ++i) {
row[4 * i + 0] = htons(rowin[3 * i + 0] * 257);
row[4 * i + 1] = htons(rowin[3 * i + 1] * 257);
row[4 * i + 2] = htons(rowin[3 * i + 2] * 257);
row[4 * i + 3] = htons(65535);
}
efwrite(row, sizeof(uint16_t), rowlen, stdout);
}
/* clean up */
jpeg_finish_decompress(&js);
jpeg_destroy_decompress(&js);
return fshut(stdout, "<stdout>");
}
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