Commit d00f1a07 authored by Tomi Valkeinen's avatar Tomi Valkeinen Committed by Mauro Carvalho Chehab
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media: subdev: add "opposite" stream helper funcs 



Add two helper functions to make dealing with streams easier:

v4l2_subdev_routing_find_opposite_end - given a routing table and a pad
+ stream, return the pad + stream on the opposite side of the subdev.

v4l2_subdev_state_get_opposite_stream_format - return a pointer to the
format on the pad + stream on the opposite side from the given pad +
stream.

Signed-off-by: default avatarTomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: default avatarHans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: default avatarJacopo Mondi <jacopo@jmondi.org>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@kernel.org>
parent a6b995ed

drivers/media/v4l2-core/v4l2-subdev.c

+49 −0
Original line number Diff line number Diff line
@@ -1540,6 +1540,55 @@ v4l2_subdev_state_get_stream_compose(struct v4l2_subdev_state *state, 
}

EXPORT_SYMBOL_GPL(v4l2_subdev_state_get_stream_compose);



int v4l2_subdev_routing_find_opposite_end(const struct v4l2_subdev_krouting *routing,

					  u32 pad, u32 stream, u32 *other_pad,

					  u32 *other_stream)

{

	unsigned int i;



	for (i = 0; i < routing->num_routes; ++i) {

		struct v4l2_subdev_route *route = &routing->routes[i];



		if (route->source_pad == pad &&

		    route->source_stream == stream) {

			if (other_pad)

				*other_pad = route->sink_pad;

			if (other_stream)

				*other_stream = route->sink_stream;

			return 0;

		}



		if (route->sink_pad == pad && route->sink_stream == stream) {

			if (other_pad)

				*other_pad = route->source_pad;

			if (other_stream)

				*other_stream = route->source_stream;

			return 0;

		}

	}



	return -EINVAL;

}

EXPORT_SYMBOL_GPL(v4l2_subdev_routing_find_opposite_end);



struct v4l2_mbus_framefmt *

v4l2_subdev_state_get_opposite_stream_format(struct v4l2_subdev_state *state,

					     u32 pad, u32 stream)

{

	u32 other_pad, other_stream;

	int ret;



	ret = v4l2_subdev_routing_find_opposite_end(&state->routing,

						    pad, stream,

						    &other_pad, &other_stream);

	if (ret)

		return NULL;



	return v4l2_subdev_state_get_stream_format(state, other_pad,

						   other_stream);

}

EXPORT_SYMBOL_GPL(v4l2_subdev_state_get_opposite_stream_format);



#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */



#endif /* CONFIG_MEDIA_CONTROLLER */

include/media/v4l2-subdev.h

+36 −0
Original line number Diff line number Diff line
@@ -1532,6 +1532,42 @@ struct v4l2_rect * 
v4l2_subdev_state_get_stream_compose(struct v4l2_subdev_state *state,

				     unsigned int pad, u32 stream);



/**

 * v4l2_subdev_routing_find_opposite_end() - Find the opposite stream

 * @routing: routing used to find the opposite side

 * @pad: pad id

 * @stream: stream id

 * @other_pad: pointer used to return the opposite pad

 * @other_stream: pointer used to return the opposite stream

 *

 * This function uses the routing table to find the pad + stream which is

 * opposite the given pad + stream.

 *

 * @other_pad and/or @other_stream can be NULL if the caller does not need the

 * value.

 *

 * Returns 0 on success, or -EINVAL if no matching route is found.

 */

int v4l2_subdev_routing_find_opposite_end(const struct v4l2_subdev_krouting *routing,

					  u32 pad, u32 stream, u32 *other_pad,

					  u32 *other_stream);



/**

 * v4l2_subdev_state_get_opposite_stream_format() - Get pointer to opposite

 *                                                  stream format

 * @state: subdevice state

 * @pad: pad id

 * @stream: stream id

 *

 * This returns a pointer to &struct v4l2_mbus_framefmt for the pad + stream

 * that is opposite the given pad + stream in the subdev state.

 *

 * If the state does not contain the given pad + stream, NULL is returned.

 */

struct v4l2_mbus_framefmt *

v4l2_subdev_state_get_opposite_stream_format(struct v4l2_subdev_state *state,

					     u32 pad, u32 stream);



#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */



#endif /* CONFIG_MEDIA_CONTROLLER */