Hi Hans,
> It should generate an initial SOURCE_CHANGE event with 'changes' set to
> V4L2_EVENT_SRC_CH_RESOLUTION. That way the application that just subscribed to this
> event with V4L2_EVENT_SUB_FL_SEND_INITIAL will get an initial event.
Just checked in 3.10 which I am using, this is for the control events.
So, I will check in detail and in case fits our case, will reuse the part in my code.
> I hate to say this, but I have no idea what you mean. Can you show some code?
static int hdmirx_evt_add(struct v4l2_subscribed_event *sev, unsigned elems)
{
struct v4l2_fh *fh = sev->fh;
struct v4l2_subdev *sd = vdev_to_v4l2_subdev(fh->vdev);
struct hdmirx_ctx_s *hdmirx_ctx = v4l2_get_subdevdata(sd);
.......
list_add_tail(&sev->node, &hdmirx_ctx->subs_list);
........
return 0;
}
static void hdmirx_evt_del(struct v4l2_subscribed_event *sev)
{
struct v4l2_fh *fh = sev->fh;
struct v4l2_subdev *sd = vdev_to_v4l2_subdev(fh->vdev);
struct hdmirx_ctx_s *hdmirx_ctx = v4l2_get_subdevdata(sd);
.............
list_del(&sev->node);
..........
}
struct v4l2_subscribed_event_ops hdmirx_event_ops = {
.add = hdmirx_status_evt_add,
.del = hdmirx_status_evt_del,
.replace = v4l2_ctrl_replace,
.merge = v4l2_ctrl_merge,
};
hdmi_core_subscribe_event()
{
ret = v4l2_event_subscribe(fh, sub,
HDMIRX_EVENT_QUEUE_DEPTH, &hdmirx_event_ops);
}
static const struct v4l2_subdev_core_ops hdmirx_subdev_core_ops = {
.ioctl = xxx
.subscribe_event = hdmirx_core_subscribe_event,
...
}
v4l2_event_subscribe() takes the 4th arg as the event_ops. ctrl and source_change events are not allowing
to override ops. It can be like:
int v4l2_ctrl_subdev_subscribe_event(struct v4l2_subdev *sd, struct v4l2_fh *fh,
struct v4l2_event_subscription *sub, xxx )
{
if (!xxx)
default ops as open source
}
> But shouldn't that be handled by an alsa driver? That's what someone has to
> figure out: what goes in alsa and what still has to be provided by V4L2. For HDMI
> output in e.g. an nvidia card the audio is fully handled by alsa AFAIK.
Okay, I will come back on this later.
Let's see if I can do something better with the event handling.
Regards,
Divneil --
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