media: uapi: Add hevc ctrls for WPP decoding

raspberrypi inclusion
category: feature
bugzilla: 50432

--------------------------------

WPP can allow greater parallelism within the decode, but needs
offset information to be passed in.

Adds num_entry_point_offsets and entry_point_offset_minus1 to
v4l2_ctrl_hevc_slice_params.

This is based on Jernej Skrabec's patches for cedrus which
implement the same feature.
Signed-off-by: NDave Stevenson <dave.stevenson@raspberrypi.com>
Signed-off-by: NFang Yafen <yafen@iscas.ac.cn>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>

include/media/hevc-ctrls.h

@@ -170,6 +170,7 @@ struct v4l2_ctrl_hevc_slice_params {
 
 	/* ISO/IEC 23008-2, ITU-T Rec. H.265: General slice segment header */
 	__u32	slice_segment_addr;
+	__u32	num_entry_point_offsets;
 
 	/* ISO/IEC 23008-2, ITU-T Rec. H.265: NAL unit header */
 	__u8	nal_unit_type;
@@ -204,7 +205,9 @@ struct v4l2_ctrl_hevc_slice_params {
 	__u8	num_rps_poc_st_curr_after;
 	__u8	num_rps_poc_lt_curr;
 
-	__u8	padding[5];
+	__u8	padding;
+
+	__u32	entry_point_offset_minus1[256];
 
 	/* ISO/IEC 23008-2, ITU-T Rec. H.265: General slice segment header */
 	struct v4l2_hevc_dpb_entry dpb[V4L2_HEVC_DPB_ENTRIES_NUM_MAX];