erascape
ad017efc88
* Add v4l2loopback driver * Update some configs according to 24.04 support Change-Id: I21742f77b1635eb81fc65ed33b6a390c5de52906 Signed-off-by: erascape <erascape@proton.me>
114 lines
3.3 KiB
C
114 lines
3.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
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/*
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* v4l2loopback.h
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*
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* Written by IOhannes m zmölnig, 7/1/20.
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*
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* Copyright 2020 by IOhannes m zmölnig. Redistribution of this file is
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* permitted under the GNU General Public License.
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*/
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#ifndef _V4L2LOOPBACK_H
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#define _V4L2LOOPBACK_H
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#define V4L2LOOPBACK_VERSION_MAJOR 0
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#define V4L2LOOPBACK_VERSION_MINOR 12
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#define V4L2LOOPBACK_VERSION_BUGFIX 7
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/* /dev/v4l2loopback interface */
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struct v4l2_loopback_config {
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/**
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* the device-number (/dev/video<nr>)
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* V4L2LOOPBACK_CTL_ADD:
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* setting this to a value<0, will allocate an available one
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* if nr>=0 and the device already exists, the ioctl will EEXIST
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* if output_nr and capture_nr are the same, only a single device will be created
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* NOTE: currently split-devices (where output_nr and capture_nr differ)
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* are not implemented yet.
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* until then, requesting different device-IDs will result in EINVAL.
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*
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* V4L2LOOPBACK_CTL_QUERY:
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* either both output_nr and capture_nr must refer to the same loopback,
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* or one (and only one) of them must be -1
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*
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*/
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int output_nr;
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int unused; /*capture_nr;*/
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/**
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* a nice name for your device
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* if (*card_label)==0, an automatic name is assigned
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*/
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char card_label[32];
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/**
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* allowed frame size
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* if too low, default values are used
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*/
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unsigned int min_width;
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unsigned int max_width;
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unsigned int min_height;
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unsigned int max_height;
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/**
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* number of buffers to allocate for the queue
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* if set to <=0, default values are used
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*/
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int max_buffers;
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/**
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* how many consumers are allowed to open this device concurrently
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* if set to <=0, default values are used
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*/
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int max_openers;
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/**
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* set the debugging level for this device
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*/
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int debug;
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/**
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* whether to announce OUTPUT/CAPTURE capabilities exclusively
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* for this device or not
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* (!exclusive_caps)
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* NOTE: this is going to be removed once separate output/capture
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* devices are implemented
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*/
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int announce_all_caps;
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};
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/* For reads of v4l2 buffers, allow userspace to get hints from
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* the kernel, to produce buffers on demand or to spawn permission dialogs.
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*/
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enum v4l2_loopback_hint_type {
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HINT_UNKNOWN = 0,
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HINT_OPEN,
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HINT_CLOSE
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};
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struct v4l2_loopback_hint {
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enum v4l2_loopback_hint_type type;
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uid_t uid;
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pid_t pid;
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int node;
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};
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/* a pointer to a (struct v4l2_loopback_config) that has all values you wish to impose on the
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* to-be-created device set.
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* if the ptr is NULL, a new device is created with default values at the driver's discretion.
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*
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* returns the device_nr of the OUTPUT device (which can be used with V4L2LOOPBACK_CTL_QUERY,
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* to get more information on the device)
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*/
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#define V4L2LOOPBACK_CTL_ADD 0x4C80
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/* a pointer to a (struct v4l2_loopback_config) that has output_nr and/or capture_nr set
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* (the two values must either refer to video-devices associated with the same loopback device
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* or exactly one of them must be <0
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*/
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#define V4L2LOOPBACK_CTL_QUERY 0x4C82
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/* the device-number (either CAPTURE or OUTPUT) associated with the loopback-device */
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#define V4L2LOOPBACK_CTL_REMOVE 0x4C81
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#endif /* _V4L2LOOPBACK_H */
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