Dne nedelja, 29. maj 2022 ob 11:19:12 CEST je Jernej Škrabec napisal(a):

Dne petek, 27. maj 2022 ob 16:31:26 CEST je Benjamin Gaignard napisal(a):

quoted

Make explicit that V4L2_CID_STATELESS_HEVC_SLICE_PARAMS control is
a dynamic array control type.
Some drivers may be able to receive multiple slices in one control
to improve decoding performance.

Define the max size of the dynamic that can driver can set in .dims = {}.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
---
version 6:
- Set V4L2_CTRL_FLAG_DYNAMIC_ARRAY flag automatically when using
  V4L2_CID_STATELESS_HEVC_SLICE_PARAMS control.
- Add a define for max slices count

 Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst | 2 ++
 drivers/media/v4l2-core/v4l2-ctrls-defs.c                 | 1 +
 include/media/hevc-ctrls.h                                | 5 +++++
 3 files changed, 8 insertions(+)

diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/

Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst

quoted

index 06b967de140c..0796b1563daa 100644

--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst

@@ -2986,6 +2986,8 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
     These bitstream parameters are defined according to :ref:`hevc`.
     They are described in section 7.4.7 "General slice segment header
     semantics" of the specification.
+    This control is a dynamically sized 1-dimensional array,
+    V4L2_CTRL_FLAG_DYNAMIC_ARRAY flag must be set when using it.
 
 .. c:type:: v4l2_ctrl_hevc_slice_params
 

diff --git a/drivers/media/v4l2-core/v4l2-ctrls-defs.c b/drivers/media/

v4l2-

core/v4l2-ctrls-defs.c

quoted

index 9f55503cd3d6..d594efbcbb93 100644

--- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c

@@ -1510,6 +1510,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum 

v4l2_ctrl_type *type,

quoted

 		break;
 	case V4L2_CID_STATELESS_HEVC_SLICE_PARAMS:
 		*type = V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS;
+		*flags |= V4L2_CTRL_FLAG_DYNAMIC_ARRAY;

This change breaks Cedrus. I'll check what needs to be changed.

Please include the change bellow to keep Cedrus working. I'll expand support 
for more slices later.

 Best regards,
 Jernej

--- a/drivers/staging/media/sunxi/cedrus/cedrus.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus.c

@@ -178,6 +178,7 @@ static const struct cedrus_control cedrus_controls[] = {
        {
                .cfg = {
                        .id     = V4L2_CID_STATELESS_HEVC_SLICE_PARAMS,
+                       .dims   = { 1 },
                },
                .codec          = CEDRUS_CODEC_H265,
        },
 

quoted

 		break;
 	case V4L2_CID_STATELESS_HEVC_SCALING_MATRIX:
 		*type = V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX;

diff --git a/include/media/hevc-ctrls.h b/include/media/hevc-ctrls.h
index 0dbd5d681c28..140151609c96 100644
--- a/include/media/hevc-ctrls.h
+++ b/include/media/hevc-ctrls.h

@@ -311,9 +311,14 @@ struct v4l2_hevc_pred_weight_table {
 #define 

V4L2_HEVC_SLICE_PARAMS_FLAG_SLICE_LOOP_FILTER_ACROSS_SLICES_ENABLED 

(1ULL << 8)

quoted

 #define V4L2_HEVC_SLICE_PARAMS_FLAG_DEPENDENT_SLICE_SEGMENT	(1ULL << 

9)

quoted

 
+#define V4L2_HEVC_SLICE_MAX_COUNT	600
+
 /**
  * v4l2_ctrl_hevc_slice_params - HEVC slice parameters
  *
+ * This control is a dynamically sized 1-dimensional array,
+ * V4L2_CTRL_FLAG_DYNAMIC_ARRAY flag must be set when using it.
+ *
  * @bit_size: size (in bits) of the current slice data
  * @data_bit_offset: offset (in bits) to the video data in the current 

slice 

data

quoted

  * @nal_unit_type: specifies the coding type of the slice (B, P or I)
-- 
2.32.0

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