From c74695d07e8f9c49f4882877f4e2a227e8f789e6 Mon Sep 17 00:00:00 2001
From: tth <sigfood@dinorama.fr>
Date: Sat, 27 Jul 2019 04:03:57 +0200
Subject: [PATCH] enumerate image formats

---
 v4l2/v4l2_pr_structs.c | 13 +++++++++++++
 v4l2/v4l2_pr_structs.h |  1 +
 v4l2/video-infos.c     | 38 +++++++++++++++++++++++++++++++++++---
 3 files changed, 49 insertions(+), 3 deletions(-)

diff --git a/v4l2/v4l2_pr_structs.c b/v4l2/v4l2_pr_structs.c
index c40faa50..d5877987 100644
--- a/v4l2/v4l2_pr_structs.c
+++ b/v4l2/v4l2_pr_structs.c
@@ -70,6 +70,19 @@ fprintf(FP, "   capabilities    0x%X\n", ptr->capabilities);
 pr_capabilities(ptr->capabilities);
 fprintf(FP, "   device caps     0x%X\n", ptr->device_caps);
 
+return -1;
+}
+/* --------------------------------------------------------------------- */
+int pr_v4l2_fmtdesc(char *txt, struct v4l2_fmtdesc *ptr)
+{
+fprintf(FP, "-- v4l2_fmtdesc, %-15s  %p\n", txt, ptr);
+
+fprintf(FP, "   index           %d\n", ptr->index);
+fprintf(FP, "   type            %d\n", ptr->type); /* enum v4l2_buf_type */
+fprintf(FP, "   flags           0x%X\n", ptr->flags); 
+fprintf(FP, "   description     %s\n", ptr->description); 
+fprintf(FP, "   pixel format    0x%X\n", ptr->pixelformat); 	/* FOURCC */
+
 return -1;
 }
 /* --------------------------------------------------------------------- */
diff --git a/v4l2/v4l2_pr_structs.h b/v4l2/v4l2_pr_structs.h
index f1616eb5..7641387d 100644
--- a/v4l2/v4l2_pr_structs.h
+++ b/v4l2/v4l2_pr_structs.h
@@ -9,6 +9,7 @@ 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);
+int pr_v4l2_fmtdesc(char *txt, struct v4l2_fmtdesc *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 7533d814..f910481a 100644
--- a/v4l2/video-infos.c
+++ b/v4l2/video-infos.c
@@ -19,6 +19,37 @@
 
 int		verbosity;
 
+/* --------------------------------------------------------------------- */
+int enum_image_formats(int fd, char *txt, int k)
+{
+int				foo, idx;
+struct v4l2_fmtdesc		fmtd;
+
+printf("-- image formats enumeration (%s)\n", txt);
+
+idx = 0;
+for (;;) {
+	memset(&fmtd, 0, sizeof(fmtd));
+	fmtd.index = idx;
+	fmtd.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+
+	foo = ioctl(fd, VIDIOC_ENUM_FMT, &fmtd);
+	// fprintf(stderr, "B idx=%d, foo=%d, errno=%d\n", idx, foo, errno);
+	if (foo) {
+		if (EINVAL==errno) {
+			break;
+			}
+		else	{
+			perror(__func__);
+			break;
+			}
+		}
+	pr_v4l2_fmtdesc(__func__, &fmtd);
+
+	idx++;
+	}
+return -1;
+}
 /* --------------------------------------------------------------------- */
 static int enum_inputs(int fd, char *txt, int k)
 {
@@ -124,7 +155,7 @@ while (0 == ioctl (fd, VIDIOC_QUERYCTRL, &qctrl)) {
 return -1;
 }
 /* --------------------------------------------------------------------- */
-int show_webcam_infos(char *devname, int k)
+int show_webcam_infos(char *devname, char *title, int k)
 {
 int				vfd, foo;
 
@@ -162,8 +193,9 @@ if (-1 == ioctl(vfd, VIDIOC_ENUMINPUT, &input)) {
 	}
 pr_v4l2_input("input 0", &input);
 
-foo = enum_inputs(vfd, "is that working ?", 0);
+foo = enum_inputs(vfd, "on peut voir quoi ?", 0);
 
+foo = enum_image_formats(vfd, "Experimental", 0);
 
 fputs("--\n", stderr);
 foo = enum_controls(vfd, "is that working ?", 0);
@@ -216,7 +248,7 @@ while ((opt = getopt(argc, argv, "d:hK:lv")) != -1) {
 
 if (verbosity) fimg_print_version(0);
 
-foo = show_webcam_infos(device, K);
+foo = show_webcam_infos(device, "", K);
 fprintf(stderr, "\n\tshow_webcam_infos -> %d\n", foo);
 
 return 0;