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/* See LICENSE file for copyright and license details. */
#include "stream.h"
#include "util.h"
#include <string.h>
#include <unistd.h>
USAGE("[-r]")
static size_t fm;
static double fmd;
static void
process_xyza(struct stream *stream, size_t n, size_t f)
{
size_t i;
double a;
for (i = 0; i < n; i += stream->pixel_size) {
a = ((double *)(stream->buf + i))[3];
a = a * (double)(fm - f) / fmd;
((double *)(stream->buf + i))[3] = a;
}
}
static void
process_xyza_r(struct stream *stream, size_t n, size_t f)
{
size_t i;
double a;
for (i = 0; i < n; i += stream->pixel_size) {
a = ((double *)(stream->buf + i))[3];
a = a * (double)f / fmd;
((double *)(stream->buf + i))[3] = a;
}
}
int
main(int argc, char *argv[])
{
struct stream stream;
int reverse = 0;
void (*process)(struct stream *stream, size_t n, size_t f) = NULL;
ARGBEGIN {
case 'r':
reverse = 1;
break;
default:
usage();
} ARGEND;
if (argc)
usage();
stream.fd = STDIN_FILENO;
stream.file = "<stdin>";
einit_stream(&stream);
if (!strcmp(stream.pixfmt, "xyza"))
process = reverse ? process_xyza_r : process_xyza;
else
eprintf("pixel format %s is not supported, try xyza\n", stream.pixfmt);
fprint_stream_head(stdout, &stream);
efflush(stdout, "<stdout>");
fmd = fm = stream.frames - 1;
process_each_frame_segmented(&stream, STDOUT_FILENO, "<stdout>", process);
return 0;
}
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