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	blind-double-sine-wave.c - blind - suckless command-line video editing utility
	git clone git://git.suckless.org/blind
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	blind-double-sine-wave.c (1482B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #ifndef TYPE
	3 #include "common.h"
	4
	5 USAGE("[-e]")
	6
	7 static int equal = 0;
	8
	9 #define FILE "blind-double-sine-wave.c"
	10 #include "define-functions.h"
	11
	12 int
	13 main(int argc, char *argv[])
	14 {
	15 struct stream stream;
	16 void (process)(struct stream stream);
	17
	18 ARGBEGIN {
	19 case 'e':
	20 equal = 1;
	21 break;
	22 default:
	23 usage();
	24 } ARGEND;
	25
	26 if (argc)
	27 usage();
	28
	29 eopen_stream(&stream, NULL);
	30
	31 SELECT_PROCESS_FUNCTION(&stream);
	32 fprint_stream_head(stdout, &stream);
	33 efflush(stdout, "<stdout>");
	34 process(&stream);
	35 return 0;
	36 }
	37
	38 #else
	39
	40 static void
	41 PROCESS(struct stream *stream)
	42 {
	43 size_t i, j, n;
	44 TYPE v, *p;
	45 do {
	46 if (equal) {
	47 n = stream->ptr / stream->pixel_size;
	48 for (i = 0; i < n; i++) {
	49 p = (TYPE )(stream->buf) + i stream->…
	50 v = posmod(*p, (TYPE)2);
	51 v = v > 1 ? 2 - v : v;
	52 v = 1 - (sin(v * (2 * (TYPE)M_PI)) + 1) …
	53 for (j = 0; j < stream->n_chan; j++)
	54 p[j] = v;
	55 }
	56 n *= stream->pixel_size;
	57 } else {
	58 n = stream->ptr / stream->chan_size;
	59 for (i = 0; i < n; i++) {
	60 p = (TYPE *)(stream->buf) + i;
	61 v = posmod(*p, (TYPE)2);
	62 v = v > 1 ? 2 - v : v;
	63 p = 1 - (sin(v (2 * (TYPE)M_PI)) + 1)…
	64 }
	65 n *= stream->chan_size;
	66 }
	67 ewriteall(STDOUT_FILENO, stream->buf, n, "<stdout>");
	68 memmove(stream->buf, stream->buf + n, stream->ptr -= n);
	69 } while (eread_stream(stream, SIZE_MAX));
	70 if (stream->ptr)
	71 eprintf("%s: incomplete frame\n", stream->file);
	72 }
	73
	74 #endif