[PATCH] v4l2_core: Ignore invalid frames

[Ricardo Ribalda]

The UVC driver used to drop all the invalid frames (Eg, invalid JPEG
encoding).

Since 2024 [1] , it pushes the invalid frames to userspace.

This patch handles the invalid frames properly.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=52fbe173baa4df9d14bd733f42ee6b9ceab8299b

Signed-off-by: Ricardo Ribalda ribalda@chromium.org

gview_v4l2core/v4l2_core.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/gview_v4l2core/v4l2_core.c b/gview_v4l2core/v4l2_core.c
index d32dbfb..71fbc62 100644
--- a/gview_v4l2core/v4l2_core.c
+++ b/gview_v4l2core/v4l2_core.c
@@ -1183,6 +1183,13 @@ v4l2_frame_buff_t v4l2core_get_frame(v4l2_dev_t vd) {

   ret = xioctl(vd->fd, VIDIOC_DQBUF, &vd->buf);

• if (!ret && (vd->buf.flags & V4L2_BUF_FLAG_ERROR)){
• xioctl(vd->fd, VIDIOC_QBUF, &vd->buf);
• fprintf(stderr, "V4L2_CORE: (VIDIOC_DQBUF) Ignoring invalid frame\n");
• __UNLOCK_MUTEX(__PMUTEX);
• return NULL;
• }
  +
  if (!ret)
  qind = process_input_buffer(vd);
  else
  --
  2.55.0.rc0.799.gd6f94ed593-goog