[PATCH v2 7/8] media: hevc: Add scaling matrix control
Benjamin Gaignard
benjamin.gaignard at collabora.com
Mon Jun 14 00:43:00 PDT 2021
Le 14/06/2021 à 09:27, Hans Verkuil a écrit :
> On 10/06/2021 17:44, 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.
> Comparing H264 with HEVC I noticed that the corresponding flag for H264 is
> called V4L2_H264_PPS_FLAG_SCALING_MATRIX_PRESENT.
>
> Should those names be aligned? Also, it is part of PPS for H264 and SPS in HEVC,
> is that difference correct?
In ITU specifications ("7.4.3.2.1 General sequence parameter set RBSP semantics") this flag is define like that:
scaling_list_enabled_flag equal to 1 specifies that a scaling list is used for the scaling process for transform coefficients.
scaling_list_enabled_flag equal to 0 specifies that scaling list is not used for the scaling process for transform coefficients.
So for me the naming is correct.
Regards,
Benjamin
>
> Regards,
>
> Hans
>
>> Signed-off-by: Benjamin Gaignard <benjamin.gaignard at collabora.com>
>> ---
>> version 2:
>> - Fix structure name in ext-ctrls-codec.rst
>>
>> .../media/v4l/ext-ctrls-codec.rst | 45 +++++++++++++++++++
>> .../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, 72 insertions(+)
>>
>> diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
>> index 8c6e2a11ed95..d4f40bb85263 100644
>> --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
>> +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
>> @@ -3068,6 +3068,51 @@ 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]``
>> + -
>> + * - __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]``
>> + -
>> +
>> +.. 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 53c0038c792b..0e5c4a2eecff 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 {
>> @@ -224,6 +226,15 @@ 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)
>> /*
>>
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