From d65b93fc668100fef378669e9d4aee2145bbe2c4 Mon Sep 17 00:00:00 2001
From: tth <sigfood@dinorama.fr>
Date: Mon, 2 Sep 2019 04:31:27 +0200
Subject: [PATCH] size of capture is now an option

---
 v4l2/grabvidseq.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/v4l2/grabvidseq.c b/v4l2/grabvidseq.c
index 24f7a1d..97ea611 100644
--- a/v4l2/grabvidseq.c
+++ b/v4l2/grabvidseq.c
@@ -36,9 +36,6 @@
 #define SAVE_AS_PNM	0
 #define SAVE_AS_FIMG	0
 
-#define		WIDTH		1920
-#define		HEIGHT		1080
-
 /* --------------------------------------------------------------------- */
 
 #define CLEAR(x) memset(&(x), 0, sizeof(x))
@@ -78,6 +75,7 @@ puts("\t-n NNN\t\thow many frames ?");
 puts("\t-O ./\t\tset Output dir");
 puts("\t-o bla\t\tset output filename");
 puts("\t-p NNN\t\tperiod in seconds");
+puts("\t-s WxH\t\tsize of capture");
 puts("\t-v\t\tincrease verbosity");
 exit(0);
 }
@@ -102,6 +100,8 @@ int		foo, bar;
 double		period = 10.0;		/* delai entre les captures */
 int		nbre_capt = 1;		/* nombre de captures */
 int		opt;
+int		width = 640;
+int		height = 480;
 double		t_final;
 char		*dest_dir = ".";	/* no trailing slash */
 char		*outfile = "out.pnm";
@@ -110,7 +110,7 @@ char		*outfile = "out.pnm";
 FloatImg	grab, cumul;
 #endif
 
-while ((opt = getopt(argc, argv, "d:hn:o:O:p:v")) != -1) {
+while ((opt = getopt(argc, argv, "d:hn:o:O:p:s:v")) != -1) {
 	switch(opt) {
 		case 'd':	dev_name = optarg;		break;
 		case 'h':	help(0);			break;
@@ -118,6 +118,7 @@ while ((opt = getopt(argc, argv, "d:hn:o:O:p:v")) != -1) {
 		case 'O':	dest_dir = optarg;		break;
 		case 'o':	outfile = optarg;		break;
 		case 'p':	period = 1e6*atof(optarg);	break;
+		case 's':	parse_WxH(optarg, &width, &height);	break;
 		case 'v':	verbosity++;			break;
 		}
 	}
@@ -125,6 +126,7 @@ while ((opt = getopt(argc, argv, "d:hn:o:O:p:v")) != -1) {
 if (verbosity) {
 	fprintf(stderr, "running %s  pid=%d\n", argv[0], getpid());
 	fprintf(stderr, "period is %.3f microseconds\n", period);
+	fprintf(stderr, "framesize is %dx%d\n", width, height);
 	}
 
 fd = v4l2_open(dev_name, O_RDWR | O_NONBLOCK, 0);
@@ -135,8 +137,8 @@ if (fd < 0) {
 
 CLEAR(fmt);
 fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
-fmt.fmt.pix.width       = WIDTH;
-fmt.fmt.pix.height      = HEIGHT;
+fmt.fmt.pix.width       = width;
+fmt.fmt.pix.height      = height;
 fmt.fmt.pix.pixelformat = V4L2_PIX_FMT_RGB24;
 fmt.fmt.pix.field       = V4L2_FIELD_INTERLACED;
 xioctl(fd, VIDIOC_S_FMT, &fmt);
@@ -144,7 +146,7 @@ if (fmt.fmt.pix.pixelformat != V4L2_PIX_FMT_RGB24) {
 	printf("Libv4l didn't accept RGB24 format. Can't proceed.\n");
 	exit(EXIT_FAILURE);
 	}
-if ((fmt.fmt.pix.width != WIDTH) || (fmt.fmt.pix.height != HEIGHT)) {
+if ((fmt.fmt.pix.width != width) || (fmt.fmt.pix.height != height)) {
 	printf("Warning: driver is sending image at %dx%d\n",
 			    fmt.fmt.pix.width, fmt.fmt.pix.height);
 	}