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/* See LICENSE file for copyright and license details. */
#include "common.h"
USAGE("key-stream")
#define PROCESS(TYPE, SUFFIX)\
static void\
process_##SUFFIX(struct stream *stream, struct stream *key)\
{\
size_t i, n, m = 0;\
TYPE x1, y1, z1, a1, a2, variance2, *keyxyza;\
TYPE x, y, z, d;\
do {\
if (!m) {\
m = stream->frame_size;\
while (key->ptr < key->frame_size)\
if (!eread_stream(key, key->frame_size - key->ptr))\
return;\
keyxyza = (TYPE *)(key->buf);\
x1 = keyxyza[0];\
y1 = keyxyza[1];\
z1 = keyxyza[2];\
a1 = keyxyza[3];\
x = x1 - keyxyza[4];\
y = y1 - keyxyza[5];\
z = z1 - keyxyza[6];\
a2 = keyxyza[7];\
variance2 = x * x + y * y + z * z;\
/* TODO add more formulae: https://en.wikipedia.org/wiki/Color_difference */\
if (a2 > a1) {\
a1 = 1 - a1;\
a2 = 1 - a2;\
}\
memmove(key->buf, key->buf + key->frame_size,\
key->ptr -= key->frame_size);\
}\
n = MIN(stream->ptr, m) / stream->pixel_size;\
for (i = 0; i < n; i++) {\
x = ((TYPE *)(stream->buf))[4 * i + 0] - x1;\
y = ((TYPE *)(stream->buf))[4 * i + 1] - y1;\
z = ((TYPE *)(stream->buf))[4 * i + 2] - z1;\
d = x * x + y * y + z * z;\
if (d <= variance2) {\
if (a1 == a2)\
d = 0;\
else\
d = sqrt(d / variance2) * (a1 - a2) + a2;\
((TYPE *)(stream->buf))[4 * i + 3] *= d;\
}\
}\
n *= stream->pixel_size;\
m -= n;\
ewriteall(STDOUT_FILENO, stream->buf, n, "<stdout>");\
memmove(stream->buf, stream->buf + n, stream->ptr -= n);\
} while (eread_stream(stream, SIZE_MAX));\
if (stream->ptr)\
eprintf("%s: incomplete frame\n", stream->file);\
}
PROCESS(double, lf)
PROCESS(float, f)
int
main(int argc, char *argv[])
{
struct stream stream, key;
void (*process)(struct stream *stream, struct stream *key);
UNOFLAGS(argc != 1);
eopen_stream(&stream, NULL);
eopen_stream(&key, argv[0]);
if (!strcmp(stream.pixfmt, "xyza"))
process = process_lf;
else if (!strcmp(stream.pixfmt, "xyza f"))
process = process_f;
else
eprintf("pixel format %s is not supported, try xyza\n", stream.pixfmt);
if (strcmp(stream.pixfmt, key.pixfmt))
eprintf("videos use incompatible pixel formats\n");
if (key.width > 2 || key.height > 2 || key.width * key.height != 2)
eprintf("%s: each frame must contain exactly 2 pixels\n", key.file);
fprint_stream_head(stdout, &stream);
efflush(stdout, "<stdout>");
process(&stream, &key);
return 0;
}
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