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v4l2: Extend device caps with V4L2_CAP_STREAMING

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This capability tells the application that mmap() is supported. GStreamer
would return an error saying there there is no input/output method supported
by this device otherwise. This was tested with:

LD_PRELOAD=$(pwd)/build/src/v4l2/v4l2-compat.so GST_DEBUG="v4l2*:7" gst-launch-1.0 v4l2src ! videoconvert ! autovideosink

With this patch, GStreamer will reach playing state. It then blocks waiting on
poll() which is not implemented yet on our side.

Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
This commit is contained in:
Nicolas Dufresne 2020-01-18 16:31:23 -05:00 • committed by Laurent Pinchart
parent 3628fb704b
commit 632e0fc09f
1 changed files with 1 additions and 1 deletions
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2
src/v4l2/v4l2_camera_proxy.cpp
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@ -179,7 +179,7 @@ void V4L2CameraProxy::querycap(std::shared_ptr<Camera> camera)
sizeof(capabilities_.bus_info));
/* \todo Put this in a header/config somewhere. */
capabilities_.version = KERNEL_VERSION(5, 2, 0);
capabilities_.device_caps = V4L2_CAP_VIDEO_CAPTURE;
capabilities_.device_caps = V4L2_CAP_VIDEO_CAPTURE | V4L2_CAP_STREAMING;
capabilities_.capabilities = capabilities_.device_caps
| V4L2_CAP_DEVICE_CAPS;
memset(capabilities_.reserved, 0, sizeof(capabilities_.reserved));