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author | Jaslo Ziska <jaslo@ziska.de> | 2023-11-30 16:43:10 +0100 |
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committer | Laurent Pinchart <laurent.pinchart@ideasonboard.com> | 2023-12-07 01:39:41 +0200 |
commit | b06ebdedba52a31e8ba21ae293dfb6476b6ca117 (patch) | |
tree | 8add9062d318772bac90311d39bc69d9aeec0d4e /src/v4l2/v4l2_compat_manager.cpp | |
parent | bf231ead1c38d9a8f4a874e404e23b716612d030 (diff) |
gstreamer: Implement renegotiation
This commit implements renegotiation of the camera configuration and
source pad caps. A renegotiation can happen when a downstream element
decides to change caps or the pipeline is dynamically changed.
To handle a renegotiation the GST_FLOW_NOT_NEGOTIATED return value has
to be handled in GstLibcameraSrcState::processRequest(). Otherwise the
default would be to print an error and stop streaming.
To archive this in a clean way the if statement is altered into a switch
statement which now also has a case for GST_FLOW_NOT_NEGOTIATED. In the
case of GST_FLOW_NOT_NEGOTIATED every source pad is checked for the
reconfiguration flag with gst_pad_needs_reconfigure() which does not
clear this flag. If at least one pad requested a reconfiguration the
function returns without an error and the renegotiation will happen
later in the running task. If no pad requested a reconfiguration then
the function will return with an error.
In gst_libcamera_src_task_run() the source pads are checked for the
reconfigure flag by calling gst_pad_check_reconfigure() and if one pad
returns true and the caps are not sufficient anymore then the
negotiation is triggered. It is fine to trigger the negotiation after
only a single pad returns true for gst_pad_check_reconfigure() because
the reconfigure flags are cleared in the gst_libcamera_src_negotiate()
function.
If any pad requested a reconfiguration the following will happen:
1. The camera is stopped because changing the configuration may not
happen while running.
2. The completedRequests queue will be cleared by calling
GstLibcameraSrcState::clearRequests() because the completed buffers
have the wrong configuration.
3. The new caps are negotiated by calling gst_libcamera_src_negotiate().
When the negotiation fails streaming will stop.
4. The camera is started again.
Signed-off-by: Jaslo Ziska <jaslo@ziska.de>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Tested-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Diffstat (limited to 'src/v4l2/v4l2_compat_manager.cpp')
0 files changed, 0 insertions, 0 deletions