Revert "clients: teach simple-dmabuf-v4l to deal with flipped input"

This reverts commit 0fee977c46423e496a6eda6418c31bfe09a1f27b.

This commit introduces a requirement on v4l2_query_ext_ctrl and
VIDIOC_QUERY_EXT_CTRL, which were introduced in kernel 3.17. Some Ubuntu
LTS releases ship with much older kernels (and, significantly, UAPI),
which don't have these.

Signed-off-by: Daniel Stone <daniels@collabora.com>
Acked-by: Pekka Paalanen <pekka.paalanen@collabora.com>
Acked-by: Derek Foreman <derekf@osg.samsung.com>

diff --git a/clients/simple-dmabuf-v4l.c b/clients/simple-dmabuf-v4l.c
index 6f41b2a..af25d0e 100644 (file)
--- a/clients/simple-dmabuf-v4l.c
+++ b/clients/simple-dmabuf-v4l.c
@@ -351,67 +351,21 @@ static const struct zwp_linux_buffer_params_v1_listener params_listener = {
        create_failed
 };
 
-static bool
-check_v4l2_control_bool(const int fd,
-                        const struct v4l2_query_ext_ctrl *qectrl,
-                        const char *control_name,
-                        const int expected_value)
-{
-       struct v4l2_control ctrl;
-
-       memset(&ctrl, 0, sizeof(ctrl));
-       ctrl.id = qectrl->id;
-
-       if (qectrl->flags & V4L2_CTRL_FLAG_DISABLED)
-               return false;
-
-       if (!(qectrl->type == V4L2_CTRL_TYPE_BOOLEAN))
-               return false;
-
-       if (strcmp(qectrl->name, control_name))
-               return false;
-
-       /* with the early-outs out of the way, do the actual check */
-       if (xioctl(fd, VIDIOC_G_CTRL, &ctrl))
-               return false;
-
-       if (ctrl.value != expected_value)
-               return false;
-
-       return true;
-}
-
 static void
 create_dmabuf_buffer(struct display *display, struct buffer *buffer)
 {
        struct zwp_linux_buffer_params_v1 *params;
        uint64_t modifier;
-       uint32_t lbp_flags;
+       uint32_t flags;
        unsigned i;
-       struct v4l2_query_ext_ctrl qectrl;
-       const unsigned int v4l2_qec_flags =
-                           V4L2_CTRL_FLAG_NEXT_CTRL | V4L2_CTRL_FLAG_NEXT_COMPOUND;
-       const char *vflip_ctrl = "Vertical Flip";
-       const char *hflip_ctrl = "Horizontal Flip";
 
        modifier = 0;
-       lbp_flags = 0;
-
-       /* handle relevant v4l2 controls */
-       memset(&qectrl, 0, sizeof(qectrl));
-       qectrl.id |= v4l2_qec_flags;
-       while (!xioctl(display->v4l_fd, VIDIOC_QUERY_EXT_CTRL, &qectrl)) {
-               if (check_v4l2_control_bool(display->v4l_fd, &qectrl,
-                                            vflip_ctrl, 0x1)) {
-                       lbp_flags = ZWP_LINUX_BUFFER_PARAMS_V1_FLAGS_Y_INVERT;
-                       printf ("\"%s\" control is set, inverting Y\n", vflip_ctrl);
-               } else if (check_v4l2_control_bool(display->v4l_fd, &qectrl,
-                                                   hflip_ctrl, 0x1)) {
-                       printf ("\"%s\" control is set, but dmabuf output cannot"
-                                "be flipped horizontally\n", hflip_ctrl);
-               }
-               qectrl.id |= v4l2_qec_flags;
-       }
+       flags = 0;
+
+       /* XXX: apparently some webcams may actually provide y-inverted images,
+        * in which case we should set
+        * flags = ZWP_LINUX_BUFFER_PARAMS_V1_FLAGS_Y_INVERT
+        */
 
        params = zwp_linux_dmabuf_v1_create_params(display->dmabuf);
        for (i = 0; i < display->format.num_planes; ++i)
@@ -428,7 +382,7 @@ create_dmabuf_buffer(struct display *display, struct buffer *buffer)
                                          display->format.width,
                                          display->format.height,
                                          display->drm_format,
-                                         lbp_flags);
+                                         flags);
 }
 
 static int