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v4l2codecs: Warn user when no media devices are found

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Currently if the user is not able to access the devices under /dev/media*,
either due to no media devices present on the system or simply no permission
to access the device, v4l2codecs initialises with no features or debug messages.

Since calling `GST_DEBUG="v4l2*:7" gst-inspect-1.0 v4l2codecs` is a typical way
to diagnose why element(s) failed to enumerate, we should be more verbose here
when the user is not able to access any /dev/media* device. So print a simple
debug message in this case to aid debugging.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/3088>
This commit is contained in:
Christopher Obbard 2022-09-27 18:17:24 +01:00 committed by GStreamer Marge Bot
parent 3b900e1fa4
commit 0c83ddcdf7
1 changed files with 3 additions and 0 deletions
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3
subprojects/gst-plugins-bad/sys/v4l2codecs/gstv4l2codecdevice.c
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@ -316,6 +316,9 @@ gst_v4l2_codec_find_devices (void)
client = g_udev_client_new (NULL); client = g_udev_client_new (NULL);
udev_devices = g_udev_client_query_by_subsystem (client, "media"); udev_devices = g_udev_client_query_by_subsystem (client, "media");
if (!udev_devices)
GST_DEBUG ("Found no media devices");
for (d = udev_devices; d; d = g_list_next (d)) { for (d = udev_devices; d; d = g_list_next (d)) {
GUdevDevice *udev = (GUdevDevice *) d->data; GUdevDevice *udev = (GUdevDevice *) d->data;
const gchar *path = g_udev_device_get_device_file (udev); const gchar *path = g_udev_device_get_device_file (udev);