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Date: Thu, 16 Jul 2020 09:26:19 +0200
From: Hans Verkuil <hverkuil@...all.nl>
To: Ezequiel Garcia <ezequiel@...labora.com>,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Cc: Tomasz Figa <tfiga@...omium.org>, kernel@...labora.com,
Jonas Karlman <jonas@...boo.se>,
Alexandre Courbot <acourbot@...omium.org>,
Jeffrey Kardatzke <jkardatzke@...omium.org>,
Nicolas Dufresne <nicolas.dufresne@...labora.com>,
Philipp Zabel <p.zabel@...gutronix.de>,
Maxime Ripard <mripard@...nel.org>,
Paul Kocialkowski <paul.kocialkowski@...tlin.com>
Subject: Re: [PATCH 03/10] media: uapi: h264: Split prediction weight
parameters
On 15/07/2020 22:22, Ezequiel Garcia wrote:
> The prediction weight parameters are only required under
> certain conditions, which depend on slice header parameters.
>
> The slice header syntax specifies that the prediction
> weight table is present if:
>
> ((weighted_pred_flag && (slice_type == P || slice_type == SP)) || \
> (weighted_bipred_idc == 1 && 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@...labora.com>
> ---
> .../userspace-api/media/v4l/ext-ctrls-codec.rst | 14 +++++++++-----
> drivers/media/v4l2-core/v4l2-ctrls.c | 6 ++++++
> drivers/staging/media/sunxi/cedrus/cedrus.h | 1 +
> drivers/staging/media/sunxi/cedrus/cedrus_dec.c | 2 ++
> drivers/staging/media/sunxi/cedrus/cedrus_h264.c | 6 ++----
> include/media/h264-ctrls.h | 5 +++--
> 6 files changed, 23 insertions(+), 11 deletions(-)
>
> diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> index 16bfc98ab2f6..d1695ae96700 100644
> --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> @@ -1879,18 +1879,22 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type -
> - 0x00000008
> -
>
> -``Prediction Weight Table``
> -
> - The bitstream parameters are defined according to :ref:`h264`,
> +``V4L2_CID_MPEG_VIDEO_H264_PRED_WEIGHT (struct)``
> + Prediction weight table 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.
>
> -.. c:type:: v4l2_h264_pred_weight_table
> + .. note::
> +
> + This compound control is not yet part of the public kernel API and
> + it is expected to change.
> +
> +.. c:type:: v4l2_ctrl_h264_pred_weight
>
> .. cssclass:: longtable
>
> -.. flat-table:: struct v4l2_h264_pred_weight_table
> +.. flat-table:: struct v4l2_ctrl_h264_pred_weight
> :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..3a8a23e34c70 100644
> --- a/drivers/media/v4l2-core/v4l2-ctrls.c
> +++ b/drivers/media/v4l2-core/v4l2-ctrls.c
> @@ -1412,6 +1412,9 @@ 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_WEIGHT:
> + *type = V4L2_CTRL_TYPE_H264_PRED_WEIGHT;
> + break;
> case V4L2_CID_MPEG_VIDEO_VP8_FRAME_HEADER:
> *type = V4L2_CTRL_TYPE_VP8_FRAME_HEADER;
> break;
> @@ -2553,6 +2556,9 @@ 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_WEIGHT:
> + elem_size = sizeof(struct v4l2_ctrl_h264_pred_weight);
> + 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.h b/drivers/staging/media/sunxi/cedrus/cedrus.h
> index 96765555ab8a..80a0ecffa384 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_weight *pred_weight;
> };
>
> 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..047f773f64f9 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_weight = cedrus_find_control_data(ctx,
> + V4L2_CID_MPEG_VIDEO_H264_PRED_WEIGHT);
> 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..614b1b496e40 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_weight *pred_weight =
> + run->h264.pred_weight;
> 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 bca4a9887e7e..da2ffb77b491 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_WEIGHT (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_WEIGHT 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_weight {
> __u16 luma_log2_weight_denom;
> __u16 chroma_log2_weight_denom;
> struct v4l2_h264_weight_factors weight_factors[2];
> @@ -174,7 +176,6 @@ 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. */
>
Shouldn't this be added to union v4l2_ctrl_ptr as well?
Regards,
Hans
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