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https://github.com/obsproject/obs-studio.git
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linux-v4l2: Add support for controls
Video4Linux exposes controls for capture devices. This commit adds those controls to the properties window for v4l2-input devices.
This commit is contained in:
parent
2a1a76b3f1
commit
cbe1791362
@ -31,6 +31,7 @@ include_directories(
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set(linux-v4l2_SOURCES
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linux-v4l2.c
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v4l2-controls.c
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v4l2-input.c
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v4l2-helpers.c
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${linux-v4l2-udev_SOURCES}
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155
plugins/linux-v4l2/v4l2-controls.c
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155
plugins/linux-v4l2/v4l2-controls.c
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@ -0,0 +1,155 @@
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/*
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Copyright (C) 2019 by Gary Kramlich <grim@reaperworld.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <fcntl.h>
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#include <linux/videodev2.h>
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#include <libv4l2.h>
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#include "v4l2-controls.h"
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#define blog(level, msg, ...) blog(level, "v4l2-controls: " msg, ##__VA_ARGS__)
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#if defined(__i386__)
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#define UINT_TO_POINTER(val) ((void *)(unsigned int)(val))
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#define POINTER_TO_UINT(p) ((unsigned int)(unsigned int)(p))
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#elif defined(__x86_64__)
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#define UINT_TO_POINTER(val) ((void *)(unsigned long)(val))
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#define POINTER_TO_UINT(p) ((unsigned int)(unsigned long)(p))
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#else
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#error "unknown platform, this code won't work"
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#endif
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static bool v4l2_control_changed(void *data, obs_properties_t *props,
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obs_property_t *prop, obs_data_t *settings)
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{
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int dev = v4l2_open(obs_data_get_string(settings, "device_id"),
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O_RDWR | O_NONBLOCK);
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bool ret = false;
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(void)props;
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if (dev == -1)
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return false;
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struct v4l2_control control;
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control.id = POINTER_TO_UINT(data);
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control.value = obs_data_get_int(settings, obs_property_name(prop));
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if (0 != v4l2_ioctl(dev, VIDIOC_S_CTRL, &control)) {
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ret = true;
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}
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v4l2_close(dev);
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return ret;
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}
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static int_fast32_t v4l2_update_controls_menu(int_fast32_t dev,
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obs_properties_t *props,
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struct v4l2_queryctrl *qctrl)
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{
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obs_property_t *prop;
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struct v4l2_querymenu qmenu;
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prop = obs_properties_add_list(props, (char *)qctrl->name,
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(char *)qctrl->name, OBS_COMBO_TYPE_LIST,
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OBS_COMBO_FORMAT_INT);
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obs_property_set_modified_callback2(prop, v4l2_control_changed,
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UINT_TO_POINTER(qctrl->id));
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memset(&qmenu, 0, sizeof(qmenu));
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qmenu.id = qctrl->id;
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for (qmenu.index = qctrl->minimum;
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qmenu.index <= (uint32_t)qctrl->maximum;
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qmenu.index += qctrl->step) {
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if (0 == v4l2_ioctl(dev, VIDIOC_QUERYMENU, &qmenu)) {
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obs_property_list_add_int(prop, (char *)qmenu.name,
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qmenu.value);
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}
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}
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return 0;
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}
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int_fast32_t v4l2_update_controls(int_fast32_t dev, obs_properties_t *props,
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obs_data_t *settings)
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{
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struct v4l2_queryctrl qctrl;
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obs_property_t *prop = NULL;
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if (!dev || !props)
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return -1;
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memset(&qctrl, 0, sizeof(qctrl));
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qctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
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while (0 == v4l2_ioctl(dev, VIDIOC_QUERYCTRL, &qctrl)) {
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if (qctrl.flags & V4L2_CTRL_FLAG_DISABLED) {
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blog(LOG_INFO, "found control %s but it is disabled",
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qctrl.name);
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continue;
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}
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if (qctrl.flags & V4L2_CTRL_FLAG_READ_ONLY) {
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blog(LOG_INFO, "found control %s but it is readonly",
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qctrl.name);
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continue;
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}
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if (qctrl.flags & V4L2_CTRL_FLAG_VOLATILE) {
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blog(LOG_INFO, "found control %s but it is volatile",
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qctrl.name);
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continue;
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}
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switch (qctrl.type) {
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case V4L2_CTRL_TYPE_INTEGER:
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prop = obs_properties_add_int_slider(
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props, (char *)qctrl.name, (char *)qctrl.name,
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qctrl.minimum, qctrl.maximum, qctrl.step);
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obs_data_set_default_int(settings, (char *)qctrl.name,
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qctrl.default_value);
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obs_property_set_modified_callback2(
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prop, v4l2_control_changed,
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UINT_TO_POINTER(qctrl.id));
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break;
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case V4L2_CTRL_TYPE_BOOLEAN:
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prop = obs_properties_add_bool(
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props, (char *)qctrl.name, (char *)qctrl.name);
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obs_data_set_default_bool(settings, (char *)qctrl.name,
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qctrl.default_value);
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obs_property_set_modified_callback2(
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prop, v4l2_control_changed,
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UINT_TO_POINTER(qctrl.id));
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break;
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case V4L2_CTRL_TYPE_MENU:
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case V4L2_CTRL_TYPE_INTEGER_MENU:
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v4l2_update_controls_menu(dev, props, &qctrl);
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obs_data_set_default_int(settings, (char *)qctrl.name,
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qctrl.default_value);
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blog(LOG_INFO, "setting default for %s to %d",
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(char *)qctrl.name, qctrl.default_value);
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break;
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}
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qctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
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}
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return 0;
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}
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40
plugins/linux-v4l2/v4l2-controls.h
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40
plugins/linux-v4l2/v4l2-controls.h
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@ -0,0 +1,40 @@
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/*
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Copyright (C) 2019 by Gary Kramlich <grim@reaperworld.com>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include <obs-module.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* Update a devices properties to include all v4l controls that it supports.
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*
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* @param dev handle to the v4l2 device
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* @param props properties for the device
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* @param data the settings for the source
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*
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* @return negative on failure
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*/
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int_fast32_t v4l2_update_controls(int_fast32_t dev, obs_properties_t *props,
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obs_data_t *settings);
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#ifdef __cplusplus
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}
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#endif
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@ -35,6 +35,7 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
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#include <util/platform.h>
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#include <obs-module.h>
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#include "v4l2-controls.h"
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#include "v4l2-helpers.h"
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#if HAVE_UDEV
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@ -579,6 +580,7 @@ static bool device_selected(obs_properties_t *props, obs_property_t *p,
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obs_property_t *prop = obs_properties_get(props, "input");
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v4l2_input_list(dev, prop);
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v4l2_update_controls(dev, props, settings);
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v4l2_close(dev);
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obs_property_modified(prop, settings);
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