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media: subdev: add "opposite" stream helper funcs

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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: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Tomi Valkeinen 2021-12-21 11:22:06 +01:00 committed by Mauro Carvalho Chehab
parent a6b995ed03
commit d00f1a075c
2 changed files with 85 additions and 0 deletions
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49
drivers/media/v4l2-core/v4l2-subdev.c
View File

@ -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 */

36
include/media/v4l2-subdev.h
View File

@ -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 */