adding a new tool : video-infos

.gitignore

@@ -17,6 +17,7 @@ v4l2/capture
 v4l2/grabvidseq
 v4l2/*.o
 v4l2/*.ppm
+v4l2/video-infos
 
 tools/fimg2png
 tools/fimg2pnm

v4l2/Makefile

@@ -14,13 +14,18 @@ funcs.o:	funcs.c funcs.h Makefile
 v4l2_pr_structs.o:	v4l2_pr_structs.c v4l2_pr_structs.h Makefile
 	gcc ${COPT} -c $<
 
+grabvidseq: grabvidseq.c Makefile
+	gcc -Wall -g $< ../libfloatimg.a -lv4l2 -o $@
+
+video-infos: video-infos.c Makefile funcs.o v4l2_pr_structs.o
+	gcc -Wall -g $< ../libfloatimg.a funcs.o v4l2_pr_structs.o -o $@
+
+
 #		---------------
 #		external things
 
 capture: capture.c Makefile
 	gcc -Wall -g $<       -o $@
 
-grabvidseq: grabvidseq.c Makefile
-	gcc -Wall -g $< ../libfloatimg.a -lv4l2 -o $@
 
 

v4l2/v4l2_pr_structs.c

@@ -27,6 +27,21 @@ switch(type) {
 return "???";
 }
 /* --------------------------------------------------------------------- */
+int pr_v4l2_capability(char *txt, struct v4l2_capability *ptr)
+{
+fprintf(FP, "-- v4l2_capability, %-15s  %p\n", txt, ptr);
+
+fprintf(FP, "   driver        %s\n", ptr->driver);
+fprintf(FP, "   card          %s\n", ptr->card);
+fprintf(FP, "   bus info      %s\n", ptr->bus_info);
+
+fprintf(FP, "   version       %X\n", ptr->version);
+fprintf(FP, "   capabilities  %X\n", ptr->capabilities);
+fprintf(FP, "   device caps   %X\n", ptr->device_caps);
+
+return -1;
+}
+/* --------------------------------------------------------------------- */
 int pr_v4l2_format(char *txt, struct v4l2_format *ptr)
 {
 fprintf(FP, "-- v4l2_format, %-15s  %p\n", txt, ptr);
@@ -39,10 +54,10 @@ switch(ptr->type) {
 			fprintf(FP, "   dims     %dx%d\n",
 					ptr->fmt.pix.width,
 					ptr->fmt.pix.height);
-
 			break;
 
-	default:	fputs("   ???\n", FP);		break;
+	default:	fprintf(FP, "type is %d\n", ptr->type);
+			break;
 	
 	}
 

v4l2/v4l2_pr_structs.h

@@ -1,8 +1,12 @@
 /*
  *	fonctions pour afficher les structures de V4L2
+ *
+ *	WARNING : this is a work in progress !
  */
 
 /* --------------------------------------------------------------------- */
+int pr_v4l2_capability(char *txt, struct v4l2_capability *ptr);
+
 int pr_v4l2_format(char *txt, struct v4l2_format *ptr);
 int pr_v4l2_requestbuffers(char *txt, struct v4l2_requestbuffers *ptr);
 /* --------------------------------------------------------------------- */

v4l2/video-infos.c

@@ -0,0 +1,104 @@
+/*
+ *		tests pour capturer les webcams
+ */
+
+#include  <stdio.h>
+#include  <stdlib.h>
+#include  <unistd.h>
+#include  <math.h>
+#include  <string.h>
+#include  <sys/ioctl.h>
+
+#include  <linux/videodev2.h>
+
+#include  "../floatimg.h"
+
+#include  "v4l2_pr_structs.h"
+#include  "funcs.h"
+
+int		verbosity;
+
+/* --------------------------------------------------------------------- */
+int show_webcam_infos(char *devname, int k)
+{
+int				vfd, foo;
+
+struct v4l2_capability		cap;
+struct v4l2_format		fmt;
+
+// struct v4l2_requestbuffers      reqbuf;
+
+#if DEBUG_LEVEL
+fprintf(stderr, ">>> %s ( '%s' %d )\n", __func__, devname, k);
+#endif
+
+vfd = open_device(devname);
+if (vfd < 0) {
+	perror(devname);
+	return -3;
+	}
+
+fprintf(stderr, "\topen %s -> %d\n", devname, vfd);
+
+foo = ioctl(vfd, VIDIOC_QUERYCAP, &cap);
+if (foo < 0) {
+	perror("ioctl QUERYCAP");
+	return -4;
+	}
+pr_v4l2_capability(devname, &cap);
+if ( ! (cap.capabilities & V4L2_CAP_VIDEO_CAPTURE)) {
+	fprintf("%s : no video capture\n", devname);
+	}
+
+close(vfd);
+
+return 0;
+}
+/* --------------------------------------------------------------------- */
+int liste_des_devices(int flag)
+{
+fprintf(stderr, "%s not implemented\n", __func__);
+return -1;
+}
+/* --------------------------------------------------------------------- */
+
+void help(int k)
+{
+puts("Options :");
+puts("\t-d\tselect the video device");
+puts("\t-K\tset the K parameter");
+puts("\t-l\tlist video devices");
+puts("\t-v\tincrease verbosity");
+
+if (verbosity) { puts(""); fimg_print_version(1); }
+
+exit(0);
+}
+/* --------------------------------------------------------------------- */
+int main(int argc, char *argv[])
+{
+int		foo, opt;
+
+char		*device = "/dev/video0";
+int		K = 0;
+
+while ((opt = getopt(argc, argv, "d:hK:lv")) != -1) {
+	switch(opt) {
+		case 'd':	device = optarg;	break;
+		case 'h':	help(0);		break;
+		case 'K':	K = atol(optarg);	break;
+		case 'l':	liste_des_devices(0);	break;
+		case 'v':	verbosity++;		break;
+		}
+	}
+
+if (verbosity) fimg_print_version(0);
+
+foo = show_webcam_infos(device, K);
+fprintf(stderr, "\tshow_webcam_infos -> %d\n", foo);
+
+return 0;
+}
+/* --------------------------------------------------------------------- */
+
+