Re: [PATCH v2 03/14] media: uapi: h264: Split prediction weight parameters

From: Jonas Karlman
Date: Sat Aug 08 2020 - 17:01:33 EST

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On 2020-08-06 17:12, Ezequiel Garcia wrote:
> The prediction weight parameters are only required under
> certain conditions, which depend on slice header parameters.
>
> As specified in section 7.3.3 Slice header syntax, the prediction
> weight table is present if:
>
> ((weighted_pred_flag && (slice_type == P || slice_type == SP)) || \
> (weighted_bipred_idc == 1 && slice_type == B))

Maybe a macro can be added to help check this contition?

Something like this maybe:

#define V4L2_H264_CTRL_PRED_WEIGHTS_REQUIRED(pps, slice) \
((((pps)->flags & V4L2_H264_PPS_FLAG_WEIGHTED_PRED) && \
((slice)->slice_type == V4L2_H264_SLICE_TYPE_P || \
(slice)->slice_type == V4L2_H264_SLICE_TYPE_SP)) || \
((pps)->weighted_bipred_idc == 1 && \
(slice)->slice_type == V4L2_H264_SLICE_TYPE_B))

>
> Given its size, it makes sense to move this table to its control,
> so applications can avoid passing it if the slice doesn't specify it.
>
> Before this change struct v4l2_ctrl_h264_slice_params was 960 bytes.
> With this change, it's 188 bytes and struct v4l2_ctrl_h264_pred_weight
> is 772 bytes.
>
> Signed-off-by: Ezequiel Garcia <ezequiel@xxxxxxxxxxxxx>
> ---
> v2: Fix missing Cedrus changes and mssing control declaration,
> as noted by Hans and Jernej.
> ---
> .../media/v4l/ext-ctrls-codec.rst | 19 ++++++++++++-------
> drivers/media/v4l2-core/v4l2-ctrls.c | 8 ++++++++
> drivers/staging/media/sunxi/cedrus/cedrus.c | 7 +++++++
> drivers/staging/media/sunxi/cedrus/cedrus.h | 1 +
> .../staging/media/sunxi/cedrus/cedrus_dec.c | 2 ++
> .../staging/media/sunxi/cedrus/cedrus_h264.c | 6 ++----
> include/media/h264-ctrls.h | 5 +++--
> include/media/v4l2-ctrls.h | 2 ++
> 8 files changed, 37 insertions(+), 13 deletions(-)
>
> diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> index d1438b1e259f..c36ce5a95fc5 100644
> --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> @@ -1879,18 +1879,23 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type -
> - 0x00000008
> -
>
> -``Prediction Weight Table``
> +``V4L2_CID_MPEG_VIDEO_H264_PRED_WEIGHTS (struct)``
> + Prediction weight table defined according to :ref:`h264`,
> + section 7.4.3.2 "Prediction Weight Table Semantics".
> + The prediction weight table must be passed by applications
> + under the conditions explained in section 7.3.3 "Slice header
> + syntax".
>
> - The bitstream parameters are defined according to :ref:`h264`,
> - section 7.4.3.2 "Prediction Weight Table 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_h264_pred_weight_table
> +.. c:type:: v4l2_ctrl_h264_pred_weights
>
> .. cssclass:: longtable
>
> -.. flat-table:: struct v4l2_h264_pred_weight_table
> +.. flat-table:: struct v4l2_ctrl_h264_pred_weights
> :header-rows: 0
> :stub-columns: 0
> :widths: 1 1 2
> diff --git a/drivers/media/v4l2-core/v4l2-ctrls.c b/drivers/media/v4l2-core/v4l2-ctrls.c
> index 3f3fbcd60cc6..76c8dc8fb31c 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> @@ -897,6 +897,7 @@ const char *v4l2_ctrl_get_name(u32 id)
> case V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS: return "H264 Decode Parameters";
> case V4L2_CID_MPEG_VIDEO_H264_DECODE_MODE: return "H264 Decode Mode";
> case V4L2_CID_MPEG_VIDEO_H264_START_CODE: return "H264 Start Code";
> + case V4L2_CID_MPEG_VIDEO_H264_PRED_WEIGHTS: return "H264 Prediction Weight Table";
> case V4L2_CID_MPEG_VIDEO_MPEG2_LEVEL: return "MPEG2 Level";
> case V4L2_CID_MPEG_VIDEO_MPEG2_PROFILE: return "MPEG2 Profile";
> case V4L2_CID_MPEG_VIDEO_MPEG4_I_FRAME_QP: return "MPEG4 I-Frame QP Value";
> @@ -1412,6 +1413,9 @@ void v4l2_ctrl_fill(u32 id, const char **name, enum v4l2_ctrl_type *type,
> case V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS:
> *type = V4L2_CTRL_TYPE_H264_DECODE_PARAMS;
> break;
> + case V4L2_CID_MPEG_VIDEO_H264_PRED_WEIGHTS:
> + *type = V4L2_CTRL_TYPE_H264_PRED_WEIGHTS;
> + break;
> case V4L2_CID_MPEG_VIDEO_VP8_FRAME_HEADER:
> *type = V4L2_CTRL_TYPE_VP8_FRAME_HEADER;
> break;
> @@ -1790,6 +1794,7 @@ static int std_validate_compound(const struct v4l2_ctrl *ctrl, u32 idx,
> case V4L2_CTRL_TYPE_H264_SPS:
> case V4L2_CTRL_TYPE_H264_PPS:
> case V4L2_CTRL_TYPE_H264_SCALING_MATRIX:
> + case V4L2_CTRL_TYPE_H264_PRED_WEIGHTS:
> case V4L2_CTRL_TYPE_H264_SLICE_PARAMS:
> case V4L2_CTRL_TYPE_H264_DECODE_PARAMS:
> break;
> @@ -2553,6 +2558,9 @@ static struct v4l2_ctrl *v4l2_ctrl_new(struct v4l2_ctrl_handler *hdl,
> case V4L2_CTRL_TYPE_H264_DECODE_PARAMS:
> elem_size = sizeof(struct v4l2_ctrl_h264_decode_params);
> break;
> + case V4L2_CTRL_TYPE_H264_PRED_WEIGHTS:
> + elem_size = sizeof(struct v4l2_ctrl_h264_pred_weights);
> + break;
> case V4L2_CTRL_TYPE_VP8_FRAME_HEADER:
> elem_size = sizeof(struct v4l2_ctrl_vp8_frame_header);
> break;
> diff --git a/drivers/staging/media/sunxi/cedrus/cedrus.c b/drivers/staging/media/sunxi/cedrus/cedrus.c
> index bc27f9430eeb..027cdd1be5a0 100644
> --- a/drivers/staging/media/sunxi/cedrus/cedrus.c
> +++ b/drivers/staging/media/sunxi/cedrus/cedrus.c
> @@ -78,6 +78,13 @@ static const struct cedrus_control cedrus_controls[] = {
> .codec = CEDRUS_CODEC_H264,
> .required = true,
> },
> + {
> + .cfg = {
> + .id = V4L2_CID_MPEG_VIDEO_H264_PRED_WEIGHTS,
> + },
> + .codec = CEDRUS_CODEC_H264,
> + .required = true,

This should probably be false if this control is to be optional as implied
by the commit message.

Best regards,
Jonas

> + },
> {
> .cfg = {
> .id = V4L2_CID_MPEG_VIDEO_H264_DECODE_MODE,
> diff --git a/drivers/staging/media/sunxi/cedrus/cedrus.h b/drivers/staging/media/sunxi/cedrus/cedrus.h
> index 96765555ab8a..93c843ae14bb 100644
> --- a/drivers/staging/media/sunxi/cedrus/cedrus.h
> +++ b/drivers/staging/media/sunxi/cedrus/cedrus.h
> @@ -62,6 +62,7 @@ struct cedrus_h264_run {
> const struct v4l2_ctrl_h264_scaling_matrix *scaling_matrix;
> const struct v4l2_ctrl_h264_slice_params *slice_params;
> const struct v4l2_ctrl_h264_sps *sps;
> + const struct v4l2_ctrl_h264_pred_weights *pred_weights;
> };
>
> struct cedrus_mpeg2_run {
> diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_dec.c b/drivers/staging/media/sunxi/cedrus/cedrus_dec.c
> index 58c48e4fdfe9..6385026d1b6b 100644
> --- a/drivers/staging/media/sunxi/cedrus/cedrus_dec.c
> +++ b/drivers/staging/media/sunxi/cedrus/cedrus_dec.c
> @@ -57,6 +57,8 @@ void cedrus_device_run(void *priv)
> V4L2_CID_MPEG_VIDEO_H264_SLICE_PARAMS);
> run.h264.sps = cedrus_find_control_data(ctx,
> V4L2_CID_MPEG_VIDEO_H264_SPS);
> + run.h264.pred_weights = cedrus_find_control_data(ctx,
> + V4L2_CID_MPEG_VIDEO_H264_PRED_WEIGHTS);
> break;
>
> case V4L2_PIX_FMT_HEVC_SLICE:
> diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
> index cce527bbdf86..a9ba78b15907 100644
> --- a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
> +++ b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
> @@ -256,10 +256,8 @@ static void cedrus_write_scaling_lists(struct cedrus_ctx *ctx,
> static void cedrus_write_pred_weight_table(struct cedrus_ctx *ctx,
> struct cedrus_run *run)
> {
> - const struct v4l2_ctrl_h264_slice_params *slice =
> - run->h264.slice_params;
> - const struct v4l2_h264_pred_weight_table *pred_weight =
> - &slice->pred_weight_table;
> + const struct v4l2_ctrl_h264_pred_weights *pred_weight =
> + run->h264.pred_weights;
> struct cedrus_dev *dev = ctx->dev;
> int i, j, k;
>
> diff --git a/include/media/h264-ctrls.h b/include/media/h264-ctrls.h
> index 4c0bb7f5fb05..54cd9bec0b23 100644
> --- a/include/media/h264-ctrls.h
> +++ b/include/media/h264-ctrls.h
> @@ -36,6 +36,7 @@
> #define V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS (V4L2_CID_MPEG_BASE+1004)
> #define V4L2_CID_MPEG_VIDEO_H264_DECODE_MODE (V4L2_CID_MPEG_BASE+1005)
> #define V4L2_CID_MPEG_VIDEO_H264_START_CODE (V4L2_CID_MPEG_BASE+1006)
> +#define V4L2_CID_MPEG_VIDEO_H264_PRED_WEIGHTS (V4L2_CID_MPEG_BASE+1007)
>
> /* enum v4l2_ctrl_type type values */
> #define V4L2_CTRL_TYPE_H264_SPS 0x0110
> @@ -43,6 +44,7 @@
> #define V4L2_CTRL_TYPE_H264_SCALING_MATRIX 0x0112
> #define V4L2_CTRL_TYPE_H264_SLICE_PARAMS 0x0113
> #define V4L2_CTRL_TYPE_H264_DECODE_PARAMS 0x0114
> +#define V4L2_CTRL_TYPE_H264_PRED_WEIGHTS 0x0115
>
> enum v4l2_mpeg_video_h264_decode_mode {
> V4L2_MPEG_VIDEO_H264_DECODE_MODE_SLICE_BASED,
> @@ -125,7 +127,7 @@ struct v4l2_h264_weight_factors {
> __s16 chroma_offset[32][2];
> };
>
> -struct v4l2_h264_pred_weight_table {
> +struct v4l2_ctrl_h264_pred_weights {
> __u16 luma_log2_weight_denom;
> __u16 chroma_log2_weight_denom;
> struct v4l2_h264_weight_factors weight_factors[2];
> @@ -177,7 +179,6 @@ struct v4l2_ctrl_h264_slice_params {
> __s32 delta_pic_order_cnt0;
> __s32 delta_pic_order_cnt1;
>
> - struct v4l2_h264_pred_weight_table pred_weight_table;
> /* Size in bits of dec_ref_pic_marking() syntax element. */
> __u32 dec_ref_pic_marking_bit_size;
> /* Size in bits of pic order count syntax. */
> diff --git a/include/media/v4l2-ctrls.h b/include/media/v4l2-ctrls.h
> index f40e2cbb21d3..cb25f345e9ad 100644
> --- a/include/media/v4l2-ctrls.h
> +++ b/include/media/v4l2-ctrls.h
> @@ -51,6 +51,7 @@ struct video_device;
> * @p_h264_scaling_matrix: Pointer to a struct v4l2_ctrl_h264_scaling_matrix.
> * @p_h264_slice_params: Pointer to a struct v4l2_ctrl_h264_slice_params.
> * @p_h264_decode_params: Pointer to a struct v4l2_ctrl_h264_decode_params.
> + * @p_h264_pred_weights: Pointer to a struct v4l2_ctrl_h264_pred_weights.
> * @p_vp8_frame_header: Pointer to a VP8 frame header structure.
> * @p_hevc_sps: Pointer to an HEVC sequence parameter set structure.
> * @p_hevc_pps: Pointer to an HEVC picture parameter set structure.
> @@ -74,6 +75,7 @@ union v4l2_ctrl_ptr {
> struct v4l2_ctrl_h264_scaling_matrix *p_h264_scaling_matrix;
> struct v4l2_ctrl_h264_slice_params *p_h264_slice_params;
> struct v4l2_ctrl_h264_decode_params *p_h264_decode_params;
> + struct v4l2_ctrl_h264_pred_weights *p_h264_pred_weights;
> struct v4l2_ctrl_vp8_frame_header *p_vp8_frame_header;
> struct v4l2_ctrl_hevc_sps *p_hevc_sps;
> struct v4l2_ctrl_hevc_pps *p_hevc_pps;
>

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