Thread (7 messages) 7 messages, 3 authors, 2021-08-03

Re: [PATCH v1 1/2] media: hevc: Add scaling matrix control

From: Ezequiel Garcia <hidden>
Date: 2021-08-03 19:29:29
Also in: linux-arm-kernel, linux-media, lkml

On Thu, 2021-07-15 at 17:12 +0200, Benjamin Gaignard wrote:
HEVC scaling lists are used for the scaling process for transform
coefficients.
V4L2_HEVC_SPS_FLAG_SCALING_LIST_ENABLED has to set when they are
encoded in the bitstream.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@collabora.com>
The HEVC control structs have some holes that we should fix soon,
but the scaling matrix struct looks good, so I think we can merge this one.

Reviewed-by: Ezequiel Garcia <redacted>

Thanks,
Ezequiel
quoted hunk ↗ jump to hunk
---
 .../media/v4l/ext-ctrls-codec.rst             | 57 +++++++++++++++++++
 .../media/v4l/vidioc-queryctrl.rst            |  6 ++
 drivers/media/v4l2-core/v4l2-ctrls-core.c     |  6 ++
 drivers/media/v4l2-core/v4l2-ctrls-defs.c     |  4 ++
 include/media/hevc-ctrls.h                    | 11 ++++
 5 files changed, 84 insertions(+)
diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
index dc096a5562cd..ab3bda79b440 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
@@ -3071,6 +3071,63 @@ enum v4l2_mpeg_video_hevc_size_of_length_field -
 
     \normalsize
 
+``V4L2_CID_MPEG_VIDEO_HEVC_SCALING_MATRIX (struct)``
+    Specifies the HEVC scaling matrix parameters used for the scaling process
+    for transform coefficients.
+    These matrix and parameters are defined according to :ref:`hevc`.
+    They are described in section 7.4.5 "Scaling list data semantics" of
+    the specification.
+
+.. c:type:: v4l2_ctrl_hevc_scaling_matrix
+
+.. raw:: latex
+
+    \scriptsize
+
+.. tabularcolumns:: |p{5.4cm}|p{6.8cm}|p{5.1cm}|
+
+.. 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]``
+      - Scaling list is used for the scaling process for transform
+        coefficients. The values on each scaling list are expected
+        in raster scan order.
+    * - __u8
+      - ``scaling_list_8x8[6][64]``
+      - Scaling list is used for the scaling process for transform
+        coefficients. The values on each scaling list are expected
+        in raster scan order.
+    * - __u8
+      - ``scaling_list_16x16[6][64]``
+      - Scaling list is used for the scaling process for transform
+        coefficients. The values on each scaling list are expected
+        in raster scan order.
+    * - __u8
+      - ``scaling_list_32x32[2][64]``
+      - Scaling list is used for the scaling process for transform
+        coefficients. The values on each scaling list are expected
+        in raster scan order.
+    * - __u8
+      - ``scaling_list_dc_coef_16x16[6]``
+      - Scaling list is used for the scaling process for transform
+        coefficients. The values on each scaling list are expected
+        in raster scan order.
+    * - __u8
+      - ``scaling_list_dc_coef_32x32[2]``
+      - Scaling list is used for the scaling process for transform
+        coefficients. The values on each scaling list are expected
+        in raster scan order.
+
+.. raw:: latex
+
+    \normalsize
+
 .. c:type:: v4l2_hevc_dpb_entry
 
 .. raw:: latex
diff --git a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
index f9ecf6276129..2f491c17dd5d 100644
--- a/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
+++ b/Documentation/userspace-api/media/v4l/vidioc-queryctrl.rst
@@ -495,6 +495,12 @@ See also the examples in :ref:`control`.
       - n/a
       - A struct :c:type:`v4l2_ctrl_hevc_slice_params`, containing HEVC
        slice parameters for stateless video decoders.
+    * - ``V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX``
+      - n/a
+      - n/a
+      - n/a
+      - A struct :c:type:`v4l2_ctrl_hevc_scaling_matrix`, containing HEVC
+       scaling matrix for stateless video decoders.
     * - ``V4L2_CTRL_TYPE_VP8_FRAME``
       - n/a
       - n/a
diff --git a/drivers/media/v4l2-core/v4l2-ctrls-core.c b/drivers/media/v4l2-core/v4l2-ctrls-core.c
index c4b5082849b6..70adfc1b9c81 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls-core.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls-core.c
@@ -687,6 +687,9 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
 
                break;
 
+       case V4L2_CTRL_TYPE_HEVC_SCALING_MATRIX:
+               break;
+
        case V4L2_CTRL_TYPE_AREA:
                area = p;
                if (!area->width || !area->height)
@@ -1240,6 +1243,9 @@ 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_HEVC_DECODE_PARAMS:
                elem_size = sizeof(struct v4l2_ctrl_hevc_decode_params);
                break;
diff --git a/drivers/media/v4l2-core/v4l2-ctrls-defs.c b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
index b6344bbf1e00..cb29c2a7fabe 100644
--- a/drivers/media/v4l2-core/v4l2-ctrls-defs.c
+++ b/drivers/media/v4l2-core/v4l2-ctrls-defs.c
@@ -996,6 +996,7 @@ 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_PARAMS:            return "HEVC Decode Parameters";
        case V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE:              return "HEVC Decode Mode";
        case V4L2_CID_MPEG_VIDEO_HEVC_START_CODE:               return "HEVC Start Code";
@@ -1488,6 +1489,9 @@ 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_MPEG_VIDEO_HEVC_DECODE_PARAMS:
                *type = V4L2_CTRL_TYPE_HEVC_DECODE_PARAMS;
                break;
diff --git a/include/media/hevc-ctrls.h b/include/media/hevc-ctrls.h
index 781371bff2ad..ef63bc205756 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_CODEC_BASE + 1008)
 #define V4L2_CID_MPEG_VIDEO_HEVC_PPS           (V4L2_CID_CODEC_BASE + 1009)
 #define V4L2_CID_MPEG_VIDEO_HEVC_SLICE_PARAMS  (V4L2_CID_CODEC_BASE + 1010)
+#define V4L2_CID_MPEG_VIDEO_HEVC_SCALING_MATRIX        (V4L2_CID_CODEC_BASE + 1011)
 #define V4L2_CID_MPEG_VIDEO_HEVC_DECODE_PARAMS (V4L2_CID_CODEC_BASE + 1012)
 #define V4L2_CID_MPEG_VIDEO_HEVC_DECODE_MODE   (V4L2_CID_CODEC_BASE + 1015)
 #define V4L2_CID_MPEG_VIDEO_HEVC_START_CODE    (V4L2_CID_CODEC_BASE + 1016)
@@ -27,6 +28,7 @@
 #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
 #define V4L2_CTRL_TYPE_HEVC_DECODE_PARAMS 0x0124
 
 enum v4l2_mpeg_video_hevc_decode_mode {
@@ -225,6 +227,15 @@ struct v4l2_ctrl_hevc_decode_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];
+};
+
 /*  MPEG-class control IDs specific to the Hantro driver as defined by V4L2 */
 #define V4L2_CID_CODEC_HANTRO_BASE                             (V4L2_CTRL_CLASS_CODEC | 0x1200)
 /*
-- 
Kindly,
Ezequiel


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