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	blind-multiply-matrices.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	blind-multiply-matrices.c (3451B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #ifndef TYPE
	3 #include "common.h"
	4
	5 USAGE("[-en] leftmost-stream ... rightmost-stream")
	6
	7 static int equal = 0;
	8 static size_t max_frame_size;
	9
	10 #define FILE "blind-multiply-matrices.c"
	11 #include "define-functions.h"
	12
	13 int
	14 main(int argc, char *argv[])
	15 {
	16 struct stream *streams;
	17 size_t n_streams, i, frames = 0;
	18 int natural = 0, j;
	19 char **rev_argv;
	20 size_t max_width = 0, max_height = 0;
	21 size_t width = 0, height = 0, w, h;
	22 void (process)(struct stream streams, size_t n_streams);
	23
	24 ARGBEGIN {
	25 case 'e':
	26 equal = 1;
	27 break;
	28 case 'n':
	29 natural = 1;
	30 break;
	31 default:
	32 usage();
	33 } ARGEND;
	34
	35 if (argc < 2)
	36 usage();
	37
	38 if (natural) {
	39 rev_argv = alloca((size_t)argc * sizeof(*rev_argv));
	40 for (j = 0; j < argc; j++)
	41 rev_argv[j] = argv[argc - 1 - j];
	42 argv = rev_argv;
	43 }
	44
	45 n_streams = (size_t)argc;
	46 streams = ecalloc(n_streams, sizeof(*streams));
	47
	48 for (i = 0; i < n_streams; i++) {
	49 eopen_stream(streams + i, argv[i]);
	50 if (streams[i].frames && streams[i].frames < frames)
	51 frames = streams[i].frames;
	52 if (streams->width > max_width)
	53 max_width = streams->width;
	54 if (streams->height > max_height)
	55 max_height = streams->height;
	56 }
	57 for (i = 1; i < n_streams; i++)
	58 if (strcmp(streams->pixfmt, streams[i].pixfmt))
	59 eprintf("videos use incompatible pixel formats\n…
	60
	61 width = streams[n_streams - 1].width;
	62 height = streams[n_streams - 1].height;
	63 for (i = n_streams - 1; i--;) {
	64 if (streams[i].width != height)
	65 eprintf("videos do not have the compatible geome…
	66 height = streams[i].height;
	67 }
	68
	69 SELECT_PROCESS_FUNCTION(streams);
	70 CHECK_N_CHAN(streams, 1, 4);
	71
	72 w = streams->width, streams->width = max_width;
	73 h = streams->height, streams->height = max_height;
	74 echeck_dimensions(streams, WIDTH \| HEIGHT, NULL);
	75 streams->width = width;
	76 streams->height = height;
	77 streams->frames = frames;
	78 fprint_stream_head(stdout, streams);
	79 streams->width = w;
	80 streams->height = h;
	81 efflush(stdout, "<stdout>");
	82 max_frame_size = max_width * max_height * streams->pixel_size;
	83
	84 process(streams, n_streams);
	85
	86 free(streams);
	87 return 0;
	88 }
	89
	90 #else
	91
	92 static void
	93 PROCESS(struct stream *streams, size_t n_streams)
	94 {
	95 typedef TYPE pixel_t[4];
	96 pixel_t res, left, right, tmp;
	97 size_t i, j, w, h, h2, x, y, k, r;
	98 res = emalloc(max_frame_size);
	99 left = emalloc(max_frame_size);
	100 right = emalloc(max_frame_size);
	101
	102 while (eread_frame(streams + (n_streams - 1), res)) {
	103 w = streams[n_streams - 1].width;
	104 h = streams[n_streams - 1].height;
	105 for (i = n_streams - 1; i--;) {
	106 tmp = res, res = right, right = tmp;
	107 if (!eread_frame(streams + i, left))
	108 goto done;
	109 h2 = streams[i].height;
	110 memset(res, 0, w * h2 * streams->pixel_size);
	111
	112 /* XXX Is there any significant performance to b…
	113 if (equal) {
	114 for (y = r = 0; y < h2; y++) {
	115 for (x = 0; x < w; x++, r++) {
	116 for (k = 0; k < h; k++)
	117 res[r][0] += lef…
	118 for (j = 1; j < streams-…
	119 res[r][j] = res[…
	120 }
	121 }
	122 } else {
	123 for (y = r = 0; y < h2; y++)
	124 for (x = 0; x < w; x++, r++)
	125 for (k = 0; k < h; k++)
	126 for (j = 0; j < …
	127 res[r][j…
	128 }
	129
	130 h = h2;
	131 }
	132 ewriteall(STDOUT_FILENO, res, streams->frame_size, "<std…
	133 }
	134
	135 done:
	136 free(res);
	137 free(left);
	138 free(right);
	139 }
	140
	141 #endif