Re: [PATCH v5 09/17] media: uapi: HEVC: Define V4L2_CID_STATELESS_HEVC_SLICE_PARAMS as a dynamic array

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Le 08/04/2022 à 20:53, Nicolas Dufresne a écrit :
Le jeudi 07 avril 2022 à 17:29 +0200, Benjamin Gaignard a écrit :
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.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxxxxx>
---
  Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst | 2 ++
  include/media/hevc-ctrls.h                                | 3 +++
  2 files changed, 5 insertions(+)

diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
index 7fcc6c2bac4c..1aaf3b84b584 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
@@ -2964,6 +2964,8 @@ 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/include/media/hevc-ctrls.h b/include/media/hevc-ctrls.h
index 96a9b71d1def..28049e1a8a07 100644
--- a/include/media/hevc-ctrls.h
+++ b/include/media/hevc-ctrls.h
@@ -314,6 +314,9 @@ struct v4l2_hevc_pred_weight_table {
  /**
   * 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.
+ *
I'm not sure about this comment, but I'm sure you forgot:


--- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
@@ -1505,6 +1505,7 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum
v4l2_ctrl_type *type,
                 break;
         case V4L2_CID_STATELESS_HEVC_SLICE_PARAMS:
                 *type = V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS;
+               *flags |= V4L2_CTRL_FLAG_DYNAMIC_ARRAY;
                 break;
         case V4L2_CID_STATELESS_HEVC_SCALING_MATRIX:
                 *type = V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX;

Also, in AV1 we have V4L2_AV1_MAX_TILE_COUNT, which can be used in cfg.dims,
something the driver will actually set. We could have

#define V4L2_HEVC_MAX_TILE_COUNT 600

And drives can set:

    .dims = { V4L2_HEVC_MAX_TILE_COUNT },

In the control config.

Ok that will be in v6


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




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