/**
* Device removed callback
*
* We stop recording here so we don't block the device node
*/
static void device_removed(const char *dev, void *vptr)
{
V4L2_DATA(vptr);
obs_source_update_properties(data->source);
if (strcmp(data->device_id, dev))
return;
blog(LOG_INFO, "Device %s disconnected", dev);
v4l2_terminate(data);
}
static obs_properties_t *v4l2_properties(void *vptr)
{
V4L2_DATA(vptr);
obs_properties_t *props = obs_properties_create();
obs_property_t *device_list = obs_properties_add_list(props,
"device_id", obs_module_text("Device"),
OBS_COMBO_TYPE_LIST, OBS_COMBO_FORMAT_STRING);
obs_property_t *input_list = obs_properties_add_list(props,
"input", obs_module_text("Input"),
OBS_COMBO_TYPE_LIST, OBS_COMBO_FORMAT_INT);
obs_property_t *format_list = obs_properties_add_list(props,
"pixelformat", obs_module_text("VideoFormat"),
OBS_COMBO_TYPE_LIST, OBS_COMBO_FORMAT_INT);
obs_property_t *standard_list = obs_properties_add_list(props,
"standard", obs_module_text("VideoStandard"),
OBS_COMBO_TYPE_LIST, OBS_COMBO_FORMAT_INT);
obs_property_set_visible(standard_list, false);
obs_property_t *dv_timing_list = obs_properties_add_list(props,
"dv_timing", obs_module_text("DVTiming"),
OBS_COMBO_TYPE_LIST, OBS_COMBO_FORMAT_INT);
obs_property_set_visible(dv_timing_list, false);
obs_property_t *resolution_list = obs_properties_add_list(props,
"resolution", obs_module_text("Resolution"),
OBS_COMBO_TYPE_LIST, OBS_COMBO_FORMAT_INT);
obs_properties_add_list(props,
"framerate", obs_module_text("FrameRate"),
OBS_COMBO_TYPE_LIST, OBS_COMBO_FORMAT_INT);
obs_properties_add_bool(props,
"buffering", obs_module_text("UseBuffering"));
obs_data_t *settings = obs_source_get_settings(data->source);
v4l2_device_list(device_list, settings);
obs_data_release(settings);
obs_property_set_modified_callback(device_list, device_selected);
obs_property_set_modified_callback(input_list, input_selected);
obs_property_set_modified_callback(format_list, format_selected);
obs_property_set_modified_callback(resolution_list,
resolution_selected);
return props;
}
/**
* Device removed callback
*
* We stop recording here so we don't block the device node
*/
static void device_removed(void *vptr, calldata_t *calldata)
{
V4L2_DATA(vptr);
obs_source_update_properties(data->source);
const char *dev;
calldata_get_string(calldata, "device", &dev);
if (strcmp(data->device_id, dev))
return;
blog(LOG_INFO, "Device %s disconnected", dev);
v4l2_terminate(data);
}
static void v4l2_destroy(void *vptr)
{
V4L2_DATA(vptr);
if (!data)
return;
v4l2_terminate(data);
if (data->device_id)
bfree(data->device_id);
#if HAVE_UDEV
v4l2_unref_udev(data->udev);
#endif
bfree(data);
}
/**
* Update the settings for the v4l2 source
*
* Since there are very few settings that can be changed without restarting the
* stream we don't bother to even try. Whenever this is called the currently
* active stream (if exists) is stopped, the settings are updated and finally
* the new stream is started.
*/
static void v4l2_update(void *vptr, obs_data_t *settings)
{
V4L2_DATA(vptr);
v4l2_terminate(data);
if (data->device_id)
bfree(data->device_id);
data->device_id = bstrdup(obs_data_get_string(settings, "device_id"));
data->input = obs_data_get_int(settings, "input");
data->pixfmt = obs_data_get_int(settings, "pixelformat");
data->standard = obs_data_get_int(settings, "standard");
data->dv_timing = obs_data_get_int(settings, "dv_timing");
data->resolution = obs_data_get_int(settings, "resolution");
data->framerate = obs_data_get_int(settings, "framerate");
data->sys_timing = obs_data_get_bool(settings, "system_timing");
v4l2_init(data);
}
static void v4l2_destroy(void *vptr)
{
V4L2_DATA(vptr);
if (!data)
return;
v4l2_terminate(data);
if (data->device_id)
bfree(data->device_id);
#if HAVE_UDEV
signal_handler_t *sh = v4l2_get_udev_signalhandler();
signal_handler_disconnect(sh, "device_added", device_added, data);
signal_handler_disconnect(sh, "device_removed", device_removed, data);
v4l2_unref_udev();
#endif
bfree(data);
}
/*
* Worker thread to get video data
*/
static void *v4l2_thread(void *vptr)
{
V4L2_DATA(vptr);
int r;
fd_set fds;
uint8_t *start;
uint64_t frames;
uint64_t first_ts;
struct timeval tv;
struct v4l2_buffer buf;
struct obs_source_frame out;
size_t plane_offsets[MAX_AV_PLANES];
if (v4l2_start_capture(data->dev, &data->buffers) < 0)
goto exit;
frames = 0;
first_ts = 0;
v4l2_prep_obs_frame(data, &out, plane_offsets);
while (os_event_try(data->event) == EAGAIN) {
FD_ZERO(&fds);
FD_SET(data->dev, &fds);
tv.tv_sec = 1;
tv.tv_usec = 0;
r = select(data->dev + 1, &fds, NULL, NULL, &tv);
if (r < 0) {
if (errno == EINTR)
continue;
blog(LOG_DEBUG, "select failed");
break;
} else if (r == 0) {
blog(LOG_DEBUG, "select timeout");
continue;
}
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
if (v4l2_ioctl(data->dev, VIDIOC_DQBUF, &buf) < 0) {
if (errno == EAGAIN)
continue;
blog(LOG_DEBUG, "failed to dequeue buffer");
break;
}
out.timestamp = timeval2ns(buf.timestamp);
if (!frames)
first_ts = out.timestamp;
out.timestamp -= first_ts;
start = (uint8_t *) data->buffers.info[buf.index].start;
for (uint_fast32_t i = 0; i < MAX_AV_PLANES; ++i)
out.data[i] = start + plane_offsets[i];
obs_source_output_video(data->source, &out);
if (v4l2_ioctl(data->dev, VIDIOC_QBUF, &buf) < 0) {
blog(LOG_DEBUG, "failed to enqueue buffer");
break;
}
frames++;
}
blog(LOG_INFO, "Stopped capture after %"PRIu64" frames", frames);
exit:
v4l2_stop_capture(data->dev);
return NULL;
}