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/* See LICENSE file for copyright and license details. */
#include "common.h"
USAGE("[-en] leftmost-stream ... rightmost-stream")
static int equal = 0;
static size_t max_frame_size;
#define PROCESS(TYPE)\
do {\
typedef TYPE pixel_t[4];\
pixel_t *res, *left, *right, *tmp;\
size_t i, j, w, h, h2, x, y, k, r;\
res = emalloc(max_frame_size);\
left = emalloc(max_frame_size);\
right = emalloc(max_frame_size);\
\
while (eread_frame(streams + (n_streams - 1), res)) {\
w = streams[n_streams - 1].width;\
h = streams[n_streams - 1].height;\
for (i = n_streams - 1; i--;) {\
tmp = res, res = right, right = tmp;\
if (!eread_frame(streams + i, left))\
goto done;\
h2 = streams[i].height;\
memset(res, 0, w * h2 * streams->pixel_size);\
\
/* XXX Is there any significant performance to be gained by transposing `right`? */\
if (equal) {\
for (y = r = 0; y < h2; y++) {\
for (x = 0; x < w; x++, r++) {\
for (k = 0; k < h; k++) \
res[r][1] += left[y * h + k][1] * right[k * w + x][1];\
res[r][3] = res[r][2] = res[r][0] = res[r][1];\
}\
}\
} else {\
for (y = r = 0; y < h2; y++)\
for (x = 0; x < w; x++, r++) \
for (k = 0; k < h; k++)\
for (j = 0; j < 4; j++)\
res[r][j] += left[y * h + k][j] * right[k * w + x][j];\
}\
\
h = h2;\
}\
ewriteall(STDOUT_FILENO, res, streams->frame_size, "<stdout>");\
}\
\
done:\
free(res);\
free(left);\
free(right);\
} while (0)
static void process_lf(struct stream *streams, size_t n_streams) { PROCESS(double); }
static void process_f (struct stream *streams, size_t n_streams) { PROCESS(float); }
int
main(int argc, char *argv[])
{
struct stream *streams;
size_t n_streams, i, frames = 0;
int natural = 0, j;
char **rev_argv;
size_t max_width = 0, max_height = 0;
size_t width = 0, height = 0, w, h;
void (*process)(struct stream *streams, size_t n_streams);
ARGBEGIN {
case 'e':
equal = 1;
break;
case 'n':
natural = 1;
break;
default:
usage();
} ARGEND;
if (argc < 2)
usage();
if (natural) {
rev_argv = alloca((size_t)argc * sizeof(*rev_argv));
for (j = 0; j < argc; j++)
rev_argv[j] = argv[argc - 1 - j];
argv = rev_argv;
}
n_streams = (size_t)argc;
streams = ecalloc(n_streams, sizeof(*streams));
for (i = 0; i < n_streams; i++) {
eopen_stream(streams + i, argv[i]);
if (streams[i].frames && streams[i].frames < frames)
frames = streams[i].frames;
if (streams->width > max_width)
max_width = streams->width;
if (streams->height > max_height)
max_height = streams->height;
}
for (i = 1; i < n_streams; i++)
if (strcmp(streams->pixfmt, streams[i].pixfmt))
eprintf("videos use incompatible pixel formats\n");
width = streams[n_streams - 1].width;
height = streams[n_streams - 1].height;
for (i = n_streams - 1; i--;) {
if (streams[i].width != height)
eprintf("videos do not have the compatible geometry\n");
height = streams[i].height;
}
if (!strcmp(streams->pixfmt, "xyza"))
process = process_lf;
else if (!strcmp(streams->pixfmt, "xyza f"))
process = process_f;
else
eprintf("pixel format %s is not supported, try xyza\n", streams->pixfmt);
w = streams->width, streams->width = max_width;
h = streams->height, streams->height = max_height;
echeck_dimensions(streams, WIDTH | HEIGHT, NULL);
streams->width = width;
streams->height = height;
streams->frames = frames;
fprint_stream_head(stdout, streams);
streams->width = w;
streams->height = h;
efflush(stdout, "<stdout>");
max_frame_size = max_width * max_height * streams->pixel_size;
process(streams, n_streams);
free(streams);
return 0;
}
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