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linux-v4l2: Send STREAMON/STREAMOFF on vcam start/stop

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This implements a suggestion made in
https://github.com/floe/backscrub/issues/133#issuecomment-1085598710 to
address what appears to be a problem in the v4l2loopback driver.
And better aligns OBS' usage to the v4l2 kernel interface.

fixes #4808
Co-authored-by: Norihiro Kamae <norihiro@nagater.net>
This commit is contained in:
Stefan Hoffmeister 2022-08-15 16:21:30 +02:00 committed by Kurt Kartaltepe
parent 89eeeb9c65
commit fca624ea4f
1 changed files with 21 additions and 1 deletions
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22
plugins/linux-v4l2/v4l2-output.c
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@ -8,6 +8,8 @@
#include <fcntl.h>
#include <unistd.h>
#include <dirent.h>
#include <errno.h>
#include <string.h>
struct virtualcam_data {
obs_output_t *output;
@ -161,6 +163,15 @@ static bool try_connect(void *data, const char *device)
vsi.height = height;
obs_output_set_video_conversion(vcam->output, &vsi);
memset(&parm, 0, sizeof(parm));
parm.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
if (ioctl(vcam->device, VIDIOC_STREAMON, &parm) < 0) {
blog(LOG_ERROR, "Failed to start streaming on '%s' (%s)",
device, strerror(errno));
goto fail_close_device;
}
blog(LOG_INFO, "Virtual camera started");
obs_output_begin_data_capture(vcam->output, 0);
@ -229,8 +240,17 @@ static void virtualcam_stop(void *data, uint64_t ts)
{
struct virtualcam_data *vcam = (struct virtualcam_data *)data;
obs_output_end_data_capture(vcam->output);
close(vcam->device);
struct v4l2_streamparm parm = {0};
parm.type = V4L2_BUF_TYPE_VIDEO_OUTPUT;
if (ioctl(vcam->device, VIDIOC_STREAMOFF, &parm) < 0) {
blog(LOG_WARNING,
"Failed to stop streaming on video device %d (%s)",
vcam->device, strerror(errno));
}
close(vcam->device);
blog(LOG_INFO, "Virtual camera stopped");
UNUSED_PARAMETER(ts);