From e46d490e0559199ebff4a0fd691369fbfd42e9ed Mon Sep 17 00:00:00 2001
From: tth <sigfood@dinorama.fr>
Date: Wed, 24 Jul 2019 17:00:07 +0200
Subject: [PATCH] more and more semi-useless datas

---
 v4l2/v4l2_pr_structs.c |  44 +++++++++++++++--
 v4l2/v4l2_pr_structs.h |   4 ++
 v4l2/video-infos.c     | 110 ++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 153 insertions(+), 5 deletions(-)

diff --git a/v4l2/v4l2_pr_structs.c b/v4l2/v4l2_pr_structs.c
index 7f7f6e5..c40faa5 100644
--- a/v4l2/v4l2_pr_structs.c
+++ b/v4l2/v4l2_pr_structs.c
@@ -73,7 +73,7 @@ fprintf(FP, "   device caps     0x%X\n", ptr->device_caps);
 return -1;
 }
 /* --------------------------------------------------------------------- */
-static char *str_input_type(int t)
+char *str_input_type(int t)
 {
 switch (t) {
 	case V4L2_INPUT_TYPE_TUNER:	return "tuner";
@@ -144,6 +144,44 @@ fprintf(FP, "   type %d\n", ptr->type);		/* enum v4l2_buf_type */
 return 0;
 }
 /* --------------------------------------------------------------------- */
-/* --------------------------------------------------------------------- */
-/* --------------------------------------------------------------------- */
+char *str_ctrl_type(int type)
+{
+switch (type) {
+        case V4L2_CTRL_TYPE_INTEGER:		return "integer";
+        case V4L2_CTRL_TYPE_BOOLEAN:		return "boolean";
+        case V4L2_CTRL_TYPE_MENU:		return "menu";
+        case V4L2_CTRL_TYPE_BUTTON:		return "button";
+        case V4L2_CTRL_TYPE_INTEGER64:		return "int64";
+        case V4L2_CTRL_TYPE_CTRL_CLASS:		return "ctrl-class";
+        case V4L2_CTRL_TYPE_STRING:		return "string";
+        case V4L2_CTRL_TYPE_BITMASK:		return "bitmask";
+        case V4L2_CTRL_TYPE_INTEGER_MENU:	return "int-menu";
+	}
 
+return "???";
+}
+/* --------------------------------------------------------------------- */
+/*
+ The 32-bit qctrl.id value is subdivided into three bit ranges:
+ the top 4 bits are reserved for flags (e. g. V4L2_CTRL_FLAG_NEXT_CTRL)
+ and are not actually part of the ID.
+ The remaining 28 bits form the control ID, of which the most significant
+ 12 bits define the control class and the least significant
+ 16 bits identify the control within the control class. 
+ */
+void pr_ctrl_id(uint32_t id)
+{
+
+if (verbosity) fprintf(FP, "%08x : ", id);
+
+fprintf(FP, "%x %03x %04x", (id>>28)&0xf, 
+		V4L2_CTRL_ID2CLASS(id)>>16, id&0xffff);
+
+}
+/* --------------------------------------------------------------------- */
+int pr_v4l2_control(char *txt, struct v4l2_control *ptr)
+{
+
+return -1;
+}
+/* --------------------------------------------------------------------- */
diff --git a/v4l2/v4l2_pr_structs.h b/v4l2/v4l2_pr_structs.h
index 592c9cb..27aa743 100644
--- a/v4l2/v4l2_pr_structs.h
+++ b/v4l2/v4l2_pr_structs.h
@@ -9,5 +9,9 @@ int pr_v4l2_capability(char *txt, struct v4l2_capability *ptr);
 int pr_v4l2_input(char *txt, struct v4l2_input *ptr);
 int pr_v4l2_format(char *txt, struct v4l2_format *ptr);
 int pr_v4l2_requestbuffers(char *txt, struct v4l2_requestbuffers *ptr);
+
+char *str_input_type(int t);
+char *str_ctrl_type(int type);
+
 /* --------------------------------------------------------------------- */
 
diff --git a/v4l2/video-infos.c b/v4l2/video-infos.c
index 7579a7d..64efe95 100644
--- a/v4l2/video-infos.c
+++ b/v4l2/video-infos.c
@@ -8,7 +8,7 @@
 #include  <math.h>
 #include  <string.h>
 #include  <sys/ioctl.h>
-
+#include  <errno.h>
 #include  <linux/videodev2.h>
 
 #include  "../floatimg.h"
@@ -19,12 +19,109 @@
 int		verbosity;
 
 /* --------------------------------------------------------------------- */
-static int enum_input(char *txt, int k)
+static int enum_inputs(int fd, char *txt, int k)
 {
+int 				index, foo;
+struct v4l2_input		input;
+
+printf("-- inputs enumeration '%s'\n", txt);
+
+index = 0;
+for(;;)	{
+	memset (&input, 0, sizeof (input));
+	input.index = index;
+	foo = ioctl(fd, VIDIOC_ENUMINPUT, &input);
+	if (foo) {
+		if (EINVAL==errno) { break; }
+		else	{
+			perror("enuminput");
+			return -1;
+			}
+		}
+
+	printf("%-32s | %-10s\n",	input.name,
+				str_input_type(input.type));
+
+	index++;
+	}
+
+return 0;
+}
+/* --------------------------------------------------------------------- */
+
+int enum_controls(int fd, char *txt, int k)
+{
+struct v4l2_queryctrl		qctrl;
+int				foo, idx;
+
+
+printf("-- controls enumeration '%s'\n", txt);
+
+memset (&qctrl, 0, sizeof (qctrl));
+
+/* V4L2_CID_BASE defined in linux/v4l2-controls.h */
+
+for (idx=V4L2_CID_BASE; idx<V4L2_CID_LASTP1; idx++) {
+
+	qctrl.id = idx;
+
+	if (verbosity) printf("  id %d  ", idx);
+
+	if (0 == ioctl (fd, VIDIOC_QUERYCTRL, &qctrl)) {
+		if (qctrl.flags & V4L2_CTRL_FLAG_DISABLED) {
+			printf("disabled\n");
+			continue;
+			}
+
+		printf("  %-32s   %-10s  [%d..%d]\n",
+			qctrl.name,
+			str_ctrl_type(qctrl.type),
+			qctrl.minimum, qctrl.maximum);
+
+		}
+	else if (EINVAL==errno) {
+		if (verbosity) puts("einval");
+		continue;
+		}
+	else	{
+		printf("err %d %s\n", errno, strerror(errno));
+		}
+	fflush(stdout); fflush(stderr);
+	}
 
 return -1;
 }
+/* --------------------------------------------------------------------- */
+/*
+ *	code based on :
+https://www.linuxtv.org/downloads/legacy/video4linux/API/V4L2_API/spec-single/v4l2.html
+ *
+ */
+int enum_extended_controls(int fd, char *txt, int k)
+{
+struct v4l2_queryctrl		qctrl;
+int				idx;
 
+printf("-- controls enumeration '%s'\n", txt);
+
+memset(&qctrl, 0, sizeof(qctrl));
+qctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
+
+idx = 0;
+while (0 == ioctl (fd, VIDIOC_QUERYCTRL, &qctrl)) {
+
+	pr_ctrl_id(qctrl.id);
+	printf("  %-32s   %-10s  [%d..%d]\n",
+		qctrl.name,
+		str_ctrl_type(qctrl.type),
+		qctrl.minimum, qctrl.maximum);
+
+	qctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
+	idx++;
+	}
+
+return -1;
+}
 /* --------------------------------------------------------------------- */
 int show_webcam_infos(char *devname, int k)
 {
@@ -64,6 +161,15 @@ if (-1 == ioctl(vfd, VIDIOC_ENUMINPUT, &input)) {
 	}
 pr_v4l2_input("input 0", &input);
 
+foo = enum_inputs(vfd, "is that working ?", 0);
+
+
+fputs("--\n", stderr);
+foo = enum_controls(vfd, "is that working ?", 0);
+
+fputs("--\n", stderr);
+foo = enum_extended_controls(vfd, "looking for extended", 0);
+
 
 close(vfd);