diff options
| author | Kieran Bingham <kieran.bingham@ideasonboard.com> | 2022-01-03 22:49:13 +0000 |
|---|---|---|
| committer | Kieran Bingham <kieran.bingham@ideasonboard.com> | 2022-02-04 09:39:46 +0000 |
| commit | b7d48634c5d389eddd761d888663e2c01232b784 (patch) | |
| tree | bc70b3aaa0bd730ee868cd3fab84841a4bafc215 | |
| parent | e526a57d09a3cb9fe226e70f896b4beaa8f9180a (diff) | |
v4l2: Provide libcamerify wrapper script
Support easier usage of the v4l2 compatibility layer with a script that
handles the LD_PRELOAD for applications.
The wrapper can be prefixed to launch any application with the preload
set:
$ libcamera-v4l2 v4l2-ctl --list-devices
\_SB_.PCI0.GP13.XHC0.RHUB.PRT4- (libcamera:0):
/dev/video0
platform/vimc.0 Sensor B (libcamera:1):
/dev/video2
/dev/video3
/dev/video4
Specifying '-d' once before the command to run will enable V4L2Compat
layer debug output from libcamera.
Specifying '-d' twice will enable all debug levels from all libcamera
components and provide a very detailed log for analysis.
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
| -rwxr-xr-x | src/v4l2/libcamerify.in | 47 | ||||
| -rw-r--r-- | src/v4l2/meson.build | 11 |
2 files changed, 58 insertions, 0 deletions
diff --git a/src/v4l2/libcamerify.in b/src/v4l2/libcamerify.in new file mode 100755 index 00000000..c4ea273f --- /dev/null +++ b/src/v4l2/libcamerify.in @@ -0,0 +1,47 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0-or-later + +help() { + echo "$0: Load an application with libcamera V4L2 compatibility layer preload" + echo " $0 [OPTIONS...] executable [args]" + echo " -d, --debug Increase log level" +} + +debug=0 +while [ $# -gt 0 ]; do + case $1 in + -d|--debug) + debug=$((debug+1)) + ;; + -h) + help; + exit 0 + ;; + --) + shift; + break;; + -*) + echo "Unrecognised option: $1"; + help; + exit 1 + ;; + *) + break + ;; + esac + shift +done + +[ $debug -gt 0 ] && loglevel=V4L2Compat:0 +[ $debug -gt 1 ] && loglevel=0 +[ "$loglevel" != "" ] && export LIBCAMERA_LOG_LEVELS=$loglevel + +if [ "$LD_PRELOAD" = "" ] ; then + LD_PRELOAD='@LIBCAMERA_V4L2_SO@' +else + LD_PRELOAD="$LD_PRELOAD "'@LIBCAMERA_V4L2_SO@' +fi + +export LD_PRELOAD + +exec "$@" diff --git a/src/v4l2/meson.build b/src/v4l2/meson.build index f78497b6..f132103c 100644 --- a/src/v4l2/meson.build +++ b/src/v4l2/meson.build @@ -33,3 +33,14 @@ v4l2_compat = shared_library('v4l2-compat', install : true, dependencies : [libcamera_private, libdl], cpp_args : v4l2_compat_cpp_args) + +# Provide a wrapper script to support easily loading applications with the V4L2 +# adaptation layer. + +cdata = configuration_data() +cdata.set('LIBCAMERA_V4L2_SO', get_option('prefix') / get_option('libdir') / 'v4l2-compat.so') + +configure_file(input : 'libcamerify.in', + output : 'libcamerify', + configuration : cdata, + install_dir : get_option('bindir')) |