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Subject[PATCH v2 1/4] media: uapi: hevc: Add scaling matrix control
Date
HEVC has a scaling matrix concept. Add support for it.

Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net>
---
.../media/uapi/v4l/ext-ctrls-codec.rst | 41 +++++++++++++++++++
.../media/uapi/v4l/pixfmt-compressed.rst | 1 +
drivers/media/v4l2-core/v4l2-ctrls.c | 10 +++++
include/media/hevc-ctrls.h | 11 +++++
4 files changed, 63 insertions(+)

diff --git a/Documentation/media/uapi/v4l/ext-ctrls-codec.rst b/Documentation/media/uapi/v4l/ext-ctrls-codec.rst
index 28313c0f4e7c..aab1451e54d4 100644
--- a/Documentation/media/uapi/v4l/ext-ctrls-codec.rst
+++ b/Documentation/media/uapi/v4l/ext-ctrls-codec.rst
@@ -4180,6 +4180,47 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
- ``padding[6]``
- Applications and drivers must set this to zero.

+``V4L2_CID_MPEG_VIDEO_HEVC_SCALING_MATRIX (struct)``
+ Specifies the scaling matrix (as extracted from the bitstream) for
+ the associated HEVC slice data. The bitstream parameters are
+ defined according to :ref:`hevc`, section 7.4.5 "Scaling list
+ data semantics". For further documentation, refer to the above
+ specification, unless there is an explicit comment stating
+ otherwise.
+
+ .. note::
+
+ This compound control is not yet part of the public kernel API and
+ it is expected to change.
+
+.. c:type:: v4l2_ctrl_hevc_scaling_matrix
+
+.. cssclass:: longtable
+
+.. flat-table:: struct v4l2_ctrl_hevc_scaling_matrix
+ :header-rows: 0
+ :stub-columns: 0
+ :widths: 1 1 2
+
+ * - __u8
+ - ``scaling_list_4x4[6][16]``
+ -
+ * - __u8
+ - ``scaling_list_8x8[6][64]``
+ -
+ * - __u8
+ - ``scaling_list_16x16[6][64]``
+ -
+ * - __u8
+ - ``scaling_list_32x32[2][64]``
+ -
+ * - __u8
+ - ``scaling_list_dc_coef_16x16[6]``
+ -
+ * - __u8
+ - ``scaling_list_dc_coef_32x32[2]``
+ -
+
``V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE (enum)``
Specifies the decoding mode to use. Currently exposes slice-based and
frame-based decoding but new modes might be added later on.
diff --git a/Documentation/media/uapi/v4l/pixfmt-compressed.rst b/Documentation/media/uapi/v4l/pixfmt-compressed.rst
index 561bda112809..3aabc322daa4 100644
--- a/Documentation/media/uapi/v4l/pixfmt-compressed.rst
+++ b/Documentation/media/uapi/v4l/pixfmt-compressed.rst
@@ -207,6 +207,7 @@ Compressed Formats
* ``V4L2_CID_MPEG_VIDEO_HEVC_SPS``
* ``V4L2_CID_MPEG_VIDEO_HEVC_PPS``
* ``V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS``
+ * ``V4L2_CID_MPEG_VIDEO_HEVC_SCALING_MATRIX``
See the :ref:`associated Codec Control IDs <v4l2-mpeg-hevc>`.
Buffers associated with this pixel format must contain the appropriate
number of macroblocks to decode a full corresponding frame.
diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
index 2928c5e0a73d..8cc5ef33b8fd 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls.c
@@ -975,6 +975,7 @@ const char *v4l2_ctrl_get_name(u32 id)
case V4L2_CID_MPEG_VIDEO_HEVC_SPS: return "HEVC Sequence Parameter Set";
case V4L2_CID_MPEG_VIDEO_HEVC_PPS: return "HEVC Picture Parameter Set";
case V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS: return "HEVC Slice Parameters";
+ case V4L2_CID_MPEG_VIDEO_HEVC_SCALING_MATRIX: return "HEVC Scaling Matrix";
case V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE: return "HEVC Decode Mode";
case V4L2_CID_MPEG_VIDEO_HEVC_START_CODE: return "HEVC Start Code";

@@ -1407,6 +1408,9 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
case V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS:
*type = V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS;
break;
+ case V4L2_CID_MPEG_VIDEO_HEVC_SCALING_MATRIX:
+ *type = V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX;
+ break;
case V4L2_CID_UNIT_CELL_SIZE:
*type = V4L2_CTRL_TYPE_AREA;
*flags |= V4L2_CTRL_FLAG_READ_ONLY;
@@ -1857,6 +1861,9 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
zero_padding(*p_hevc_slice_params);
break;

+ case V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX:
+ break;
+
case V4L2_CTRL_TYPE_AREA:
area = p;
if (!area->width || !area->height)
@@ -2546,6 +2553,9 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
case V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS:
elem_size = sizeof(struct v4l2_ctrl_hevc_slice_params);
break;
+ case V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX:
+ elem_size = sizeof(struct v4l2_ctrl_hevc_scaling_matrix);
+ break;
case V4L2_CTRL_TYPE_AREA:
elem_size = sizeof(struct v4l2_area);
break;
diff --git a/include/media/hevc-ctrls.h b/include/media/hevc-ctrls.h
index 1009cf0891cc..1592e52c3614 100644
--- a/include/media/hevc-ctrls.h
+++ b/include/media/hevc-ctrls.h
@@ -19,6 +19,7 @@
#define V4L2_CID_MPEG_VIDEO_HEVC_SPS (V4L2_CID_MPEG_BASE + 1008)
#define V4L2_CID_MPEG_VIDEO_HEVC_PPS (V4L2_CID_MPEG_BASE + 1009)
#define V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS (V4L2_CID_MPEG_BASE + 1010)
+#define V4L2_CID_MPEG_VIDEO_HEVC_SCALING_MATRIX (V4L2_CID_MPEG_BASE + 1011)
#define V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE (V4L2_CID_MPEG_BASE + 1015)
#define V4L2_CID_MPEG_VIDEO_HEVC_START_CODE (V4L2_CID_MPEG_BASE + 1016)

@@ -26,6 +27,7 @@
#define V4L2_CTRL_TYPE_HEVC_SPS 0x0120
#define V4L2_CTRL_TYPE_HEVC_PPS 0x0121
#define V4L2_CTRL_TYPE_HEVC_SLICE_PARAMS 0x0122
+#define V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX 0x0123

enum v4l2_mpeg_video_hevc_decode_mode {
V4L2_MPEG_VIDEO_HEVC_DECODE_MODE_SLICE_BASED,
@@ -209,4 +211,13 @@ struct v4l2_ctrl_hevc_slice_params {
__u64 flags;
};

+struct v4l2_ctrl_hevc_scaling_matrix {
+ __u8 scaling_list_4x4[6][16];
+ __u8 scaling_list_8x8[6][64];
+ __u8 scaling_list_16x16[6][64];
+ __u8 scaling_list_32x32[2][64];
+ __u8 scaling_list_dc_coef_16x16[6];
+ __u8 scaling_list_dc_coef_32x32[2];
+};
+
#endif
--
2.24.0
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