The g_embedded_data callback allows the host to retrieve frame embedded
(meta) data from a certain subdev. This callback can be implemented by
an image sensor or a MIPI-CSI receiver, allowing to read embedded frame
data from a subdev or just query it for the data size.
Signed-off-by: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
include/media/v4l2-subdev.h | 10 ++++++++++
1 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index f0f3358..be74061 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -274,6 +274,14 @@ struct v4l2_subdev_audio_ops {
s_mbus_config: set a certain mediabus configuration. This operation is added
for compatibility with soc-camera drivers and should not be used by new
software.
+
+ g_embedded_data: retrieve the frame embedded data (frame header or footer).
+ After a full frame has been transmitted the host can query a subdev
+ for frame meta data using this operation. Metadata size is returned
+ in @size, and the actual metadata in memory pointed by @data. When
+ @buf is NULL the subdev will return only the metadata size. The
+ subdevs can adjust @size to a lower value but must not write more
+ data than the @size's original value.
*/
struct v4l2_subdev_video_ops {
int (*s_routing)(struct v4l2_subdev *sd, u32 input, u32 output, u32 config);
@@ -321,6 +329,8 @@ struct v4l2_subdev_video_ops {
struct v4l2_mbus_config *cfg);
int (*s_mbus_config)(struct v4l2_subdev *sd,
const struct v4l2_mbus_config *cfg);
+ int (*g_embedded_data)(struct v4l2_subdev *sd, unsigned int *size,
+ void **buf);
};
/*
--
1.7.9
--
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