linux-v4l2: Add virtual camera output
This commit is contained in:
Clayton Groeneveld
Jim
parent
4b3639972b
commit
6af8726c74
4
.github/workflows/main.yml
vendored
4
.github/workflows/main.yml
vendored
@ -391,7 +391,9 @@ jobs:
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qtbase5-dev \
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libqt5svg5-dev \
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swig \
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libcmocka-dev
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libcmocka-dev \
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linux-generic \
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v4l2loopback-dkms
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- name: 'Restore Chromium Embedded Framework from cache'
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id: cef-cache
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uses: actions/cache@v2.1.2
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@ -43,7 +43,9 @@ sudo apt-get install -y \
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python3-dev \
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qtbase5-dev \
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libqt5svg5-dev \
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swig
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swig \
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linux-generic \
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v4l2loopback-dkms
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# build cef
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wget --quiet --retry-connrefused --waitretry=1 https://cdn-fastly.obsproject.com/downloads/cef_binary_${CEF_BUILD_VERSION}_linux64.tar.bz2
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@ -39,6 +39,7 @@ set(linux-v4l2_SOURCES
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v4l2-controls.c
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v4l2-input.c
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v4l2-helpers.c
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v4l2-output.c
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${linux-v4l2-udev_SOURCES}
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)
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@ -15,18 +15,47 @@ 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 <obs-module.h>
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#include <util/platform.h>
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OBS_DECLARE_MODULE()
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OBS_MODULE_USE_DEFAULT_LOCALE("linux-v4l2", "en-US")
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MODULE_EXPORT const char *obs_module_description(void)
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{
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return "Video4Linux2(V4L2) sources";
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return "Video4Linux2(V4L2) sources/virtual camera";
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}
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extern struct obs_source_info v4l2_input;
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extern struct obs_output_info virtualcam_info;
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static bool v4l2loopback_installed()
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{
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bool loaded = false;
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int ret = system("modinfo v4l2loopback");
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if (ret == 0)
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loaded = true;
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return loaded;
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}
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bool obs_module_load(void)
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{
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obs_register_source(&v4l2_input);
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obs_data_t *obs_settings = obs_data_create();
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if (v4l2loopback_installed()) {
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obs_register_output(&virtualcam_info);
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obs_data_set_bool(obs_settings, "vcamEnabled", true);
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} else {
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obs_data_set_bool(obs_settings, "vcamEnabled", false);
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blog(LOG_WARNING,
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"v4l2loopback not installed, virtual camera disabled");
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}
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obs_apply_private_data(obs_settings);
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obs_data_release(obs_settings);
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return true;
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}
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179
plugins/linux-v4l2/v4l2-output.c
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179
plugins/linux-v4l2/v4l2-output.c
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@ -0,0 +1,179 @@
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#include <obs-module.h>
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#include <util/platform.h>
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#include <linux/videodev2.h>
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#include <unistd.h>
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#define MAX_DEVICES 64
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struct virtualcam_data {
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obs_output_t *output;
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int device;
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uint32_t frame_size;
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};
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static const char *virtualcam_name(void *unused)
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{
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UNUSED_PARAMETER(unused);
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return "Virtual Camera Output";
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}
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static void virtualcam_destroy(void *data)
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{
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struct virtualcam_data *vcam = (struct virtualcam_data *)data;
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close(vcam->device);
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bfree(data);
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}
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static bool loopback_module_loaded()
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{
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bool loaded = false;
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char temp[512];
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FILE *fp = fopen("/proc/modules", "r");
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if (!fp)
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return false;
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while (fgets(temp, sizeof(temp), fp)) {
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if (strstr(temp, "v4l2loopback")) {
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loaded = true;
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break;
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}
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}
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if (fp)
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fclose(fp);
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return loaded;
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}
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static int loopback_module_load()
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{
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return system(
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"pkexec modprobe v4l2loopback exclusive_caps=1 card_label='OBS Virtual Camera' && sleep 0.5");
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}
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static void *virtualcam_create(obs_data_t *settings, obs_output_t *output)
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{
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struct virtualcam_data *vcam =
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(struct virtualcam_data *)bzalloc(sizeof(*vcam));
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vcam->output = output;
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UNUSED_PARAMETER(settings);
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return vcam;
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}
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static bool try_connect(void *data, int device)
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{
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struct virtualcam_data *vcam = (struct virtualcam_data *)data;
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struct v4l2_format format;
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struct v4l2_capability capability;
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struct v4l2_streamparm parm;
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uint32_t width = obs_output_get_width(vcam->output);
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uint32_t height = obs_output_get_height(vcam->output);
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vcam->frame_size = width * height * 2;
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char new_device[16];
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sprintf(new_device, "/dev/video%d", device);
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vcam->device = open(new_device, O_RDWR);
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if (vcam->device < 0)
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return false;
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if (ioctl(vcam->device, VIDIOC_QUERYCAP, &capability) < 0)
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return false;
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format.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
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if (ioctl(vcam->device, VIDIOC_G_FMT, &format) < 0)
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return false;
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struct obs_video_info ovi;
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obs_get_video_info(&ovi);
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parm.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
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parm.parm.output.capability = V4L2_CAP_TIMEPERFRAME;
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parm.parm.output.timeperframe.numerator = ovi.fps_den;
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parm.parm.output.timeperframe.denominator = ovi.fps_num;
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parm.parm.output.outputmode = 0;
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parm.parm.output.writebuffers = 0;
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parm.parm.output.extendedmode = 0;
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parm.parm.output.reserved[4] = 0;
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if (ioctl(vcam->device, VIDIOC_S_PARM, &parm) < 0)
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return false;
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format.fmt.pix.width = width;
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format.fmt.pix.height = height;
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format.fmt.pix.pixelformat = V4L2_PIX_FMT_YUYV;
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format.fmt.pix.sizeimage = vcam->frame_size;
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if (ioctl(vcam->device, VIDIOC_S_FMT, &format) < 0)
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return false;
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struct video_scale_info vsi = {0};
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vsi.format = VIDEO_FORMAT_YUY2;
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vsi.width = width;
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vsi.height = height;
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obs_output_set_video_conversion(vcam->output, &vsi);
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blog(LOG_INFO, "Virtual camera started");
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obs_output_begin_data_capture(vcam->output, 0);
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return true;
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}
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static bool virtualcam_start(void *data)
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{
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struct virtualcam_data *vcam = (struct virtualcam_data *)data;
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if (!loopback_module_loaded()) {
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if (loopback_module_load() != 0)
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return false;
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}
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for (int i = 0; i < MAX_DEVICES; i++) {
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if (!try_connect(vcam, i))
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continue;
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else
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return true;
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}
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blog(LOG_WARNING, "Failed to start virtual camera");
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return false;
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}
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static void virtualcam_stop(void *data, uint64_t ts)
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{
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struct virtualcam_data *vcam = (struct virtualcam_data *)data;
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obs_output_end_data_capture(vcam->output);
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close(vcam->device);
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blog(LOG_INFO, "Virtual camera stopped");
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UNUSED_PARAMETER(ts);
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}
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static void virtual_video(void *param, struct video_data *frame)
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{
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struct virtualcam_data *vcam = (struct virtualcam_data *)param;
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write(vcam->device, frame->data[0], vcam->frame_size);
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}
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struct obs_output_info virtualcam_info = {
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.id = "virtualcam_output",
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.flags = OBS_OUTPUT_VIDEO,
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.get_name = virtualcam_name,
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.create = virtualcam_create,
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.destroy = virtualcam_destroy,
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.start = virtualcam_start,
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.stop = virtualcam_stop,
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.raw_video = virtual_video,
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};
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