Commit graph

12 commits

Author SHA1 Message Date
Michael Tretter
c020dab393 uvcsink: use the pad's current caps to update caps_changed
The caps that were sent by the caps event can be retrieved from the sinkpad
using gst_pad_get_current_caps(). This is more reliable than using cur_caps as
we know exactly which caps upstream selected when the UVC host didn't select a
format, yet.

This further allows to simplify the check, if the uvcsink has to wait for the
caps event before switching to the internal v4l2sink.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4994>
2023-10-06 15:55:23 +00:00
Michael Tretter
733b4d9597 uvcsink: use event function instead of probe
The probe passes all events except the EVENT_CAPS. Installing and removing the
probe doesn't provide any additional value.

Install an event function and always handle EVENT_CAPS. Use the caps_changed
field, to decide, if the element has to do anything special on a EVENT_CAPS.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4994>
2023-10-06 15:55:23 +00:00
Michael Tretter
1732f8c728 uvcsink: refactor gst_uvc_sink_update_streaming
Move the sanity checks to the beginning of the function. Make the actual effect
of the function more obvious and reset the flags in the end.

This should make it easier to understand what this function is doing.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4994>
2023-10-06 15:55:23 +00:00
Michael Tretter
6637343980 uvcsink: extract helper function for updating the stream state
The uvcsink may switch to the v4l2sink after a STREAMON either on a caps event
or on a caps query.

Extract the code that handles the STREAMON into a helper function, as this is
the same code.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4994>
2023-10-06 15:55:23 +00:00
Michael Tretter
24daf9ea3d uvcsink: extract common code to reset caps_changed
The caps_changed flag must be reset for streamon and streamoff. Extract it to a
common path.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4994>
2023-10-06 15:55:23 +00:00
Michael Tretter
a9eef25717 uvcsink: remove separate function for buffer probe installation
The probe that installs the buffer probe is already on the correct pad. There is
no need for a separate function to install the probe.

While at it, change the signature of the probe functions to GstPadProbeCallback
to avoid the cast when installing the probes.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4994>
2023-10-06 15:55:23 +00:00
Michael Tretter
eac9f60608 uvcsink: extract common code in idle_probe
The RECONFIGURE event has to be sent in streamon and streamoff. Extract the
common code to a separate branch to make it easier to understand.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4994>
2023-10-06 15:55:23 +00:00
Michael Tretter
69c5529011 uvcsink: return caps when reading the host configured caps
The uvcsink calculates the caps for the format that the UVC host selected. The
gst_uvc_sink_parse_cur_caps() sets these caps as cur_caps as a side effect. This
behavior is surprising as cur_caps is later updated to reflect the actually used
caps.

Just return the configured caps to avoid side effects. This makes the function
easier to understand. Update the function name to reflect the new behavior.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4994>
2023-10-06 15:55:23 +00:00
Michael Grzeschik
17797d1d28 uvcsink: fix event peer probe
The only job of the event peer probe is to catch the upcoming caps event
and be able to react with the sink change. All other events that are
passing the pad shall be passed and ignored.

Since the probe is a blocking probe, there is no use in returning
with GST_PAD_PROBE_OK on other events. Otherwise the event would just
be blocked.

Since we are handling the probe removal of the probe already in the
event switch, we can remove the second explicit probe removal.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4994>
2023-10-06 15:55:23 +00:00
Michael Grzeschik
e3a121950b uvcsink: drop useless debug messages in peer event probe
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4994>
2023-10-06 15:55:22 +00:00
Michael Grzeschik
ea2764aa69 uvcsink: add probe handling for live pipelines
Currently the uvcsink is only capable to run in an application
that is handling the state transitions of the pipeline properly
by checking on streaming event from the uvcsink.

This code is improving the element by adding an fakesink to
consume possible videostream flow in case the pipeline state
is not changing on hosts streamoff.

This is helpfull when using local gst-launch pipelines where
the streaming event is not monitored to change the pipelines
state.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1304>
2023-06-01 19:19:05 +00:00
Michael Grzeschik
5d82deb2c5 uvcsink: add new bin element around v4l2sink
This patch adds an element to stream video data to an uvc video gadget.
The element handles the uvc events STREAMON, STREAMOFF, SETUP and DATA.
to start, stop and configure the video buffer flow by the use of pad
probes. It works with linux kernels of versions higher than v6.1.

The element makes use of the v4l2sink proxy property v4l2sink::device
to locate the corresponding device to parse the configfs for additional
data.

The code in uvc.c is basically derived from /lib/uvc.c in
https://git.ideasonboard.org/uvc-gadget.git.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1304>
2023-06-01 19:19:05 +00:00