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Date: Thu, 20 Aug 2020 11:12:47 +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>,
Jernej Skrabec <jernej.skrabec@...l.net>
Subject: Re: [PATCH v3 06/19] media: uapi: h264: Clean DPB entry interface
On 14/08/2020 15:36, Ezequiel Garcia wrote:
> As discussed recently, the current interface for the
> Decoded Picture Buffer is not enough to properly
> support field coding.
>
> This commit introduces enough semantics to support
> frame and field coding, and to signal how DPB entries
> are "used for reference".
>
> Signed-off-by: Ezequiel Garcia <ezequiel@...labora.com>
> ---
> v3:
> * Port to renamed types.
> v2:
> * Fix rkvdec usage of fields flags as noted by Jonas.
> ---
> .../media/v4l/ext-ctrls-codec.rst | 24 ++++++-------------
> drivers/media/v4l2-core/v4l2-h264.c | 4 ++--
> drivers/staging/media/rkvdec/rkvdec-h264.c | 17 ++++++-------
> include/media/h264-ctrls.h | 2 +-
> 4 files changed, 19 insertions(+), 28 deletions(-)
>
> diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> index 714a8d9ae6a0..d14da8325382 100644
> --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> @@ -2063,6 +2063,9 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type -
> * - __s32
> - ``bottom_field_order_cnt``
> -
> + * - enum :c:type:`v4l2_h264_field_reference`
> + - ``reference``
> + - Specifies how the DPB entry is referenced.
> * - __u32
> - ``flags``
> - See :ref:`DPB Entry Flags <h264_dpb_flags>`
> @@ -2080,29 +2083,16 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type -
>
> * - ``V4L2_H264_DPB_ENTRY_FLAG_VALID``
> - 0x00000001
> - - The DPB entry is valid and should be considered
> + - The DPB entry is valid (non-empty) and should be considered.
> * - ``V4L2_H264_DPB_ENTRY_FLAG_ACTIVE``
> - 0x00000002
> - - The DPB entry is currently being used as a reference frame
> + - The DPB entry is used for reference.
> * - ``V4L2_H264_DPB_ENTRY_FLAG_LONG_TERM``
> - 0x00000004
> - - The DPB entry is a long term reference frame
> + - The DPB entry is used for long-term reference.
> * - ``V4L2_H264_DPB_ENTRY_FLAG_FIELD``
> - 0x00000008
> - - The DPB entry is a field reference, which means only one of the field
> - will be used when decoding the new frame/field. When not set the DPB
> - entry is a frame reference (both fields will be used). Note that this
> - flag does not say anything about the number of fields contained in the
> - reference frame, it just describes the one used to decode the new
> - field/frame
> - * - ``V4L2_H264_DPB_ENTRY_FLAG_BOTTOM_FIELD``
> - - 0x00000010
> - - The DPB entry is a bottom field reference (only the bottom field of the
> - reference frame is needed to decode the new frame/field). Only valid if
> - V4L2_H264_DPB_ENTRY_FLAG_FIELD is set. When
> - V4L2_H264_DPB_ENTRY_FLAG_FIELD is set but
> - V4L2_H264_DPB_ENTRY_FLAG_BOTTOM_FIELD is not, that means the
> - DPB entry is a top field reference
> + - The DPB entry is a single field or a complementary field pair.
>
> ``V4L2_CID_MPEG_VIDEO_H264_DECODE_MODE (enum)``
> Specifies the decoding mode to use. Currently exposes slice-based and
> diff --git a/drivers/media/v4l2-core/v4l2-h264.c b/drivers/media/v4l2-core/v4l2-h264.c
> index edf6225f0522..12b751c09016 100644
> --- a/drivers/media/v4l2-core/v4l2-h264.c
> +++ b/drivers/media/v4l2-core/v4l2-h264.c
> @@ -66,10 +66,10 @@ v4l2_h264_init_reflist_builder(struct v4l2_h264_reflist_builder *b,
> else
> b->refs[i].frame_num = dpb[i].frame_num;
>
> - if (!(dpb[i].flags & V4L2_H264_DPB_ENTRY_FLAG_FIELD))
> + if (dpb[i].reference == V4L2_H264_FRAME_REF)
> pic_order_count = min(dpb[i].top_field_order_cnt,
> dpb[i].bottom_field_order_cnt);
> - else if (dpb[i].flags & V4L2_H264_DPB_ENTRY_FLAG_BOTTOM_FIELD)
> + else if (dpb[i].reference & V4L2_H264_BOTTOM_FIELD_REF)
> pic_order_count = dpb[i].bottom_field_order_cnt;
> else
> pic_order_count = dpb[i].top_field_order_cnt;
> diff --git a/drivers/staging/media/rkvdec/rkvdec-h264.c b/drivers/staging/media/rkvdec/rkvdec-h264.c
> index 7b66e2743a4f..07a80e9a9df2 100644
> --- a/drivers/staging/media/rkvdec/rkvdec-h264.c
> +++ b/drivers/staging/media/rkvdec/rkvdec-h264.c
> @@ -949,16 +949,17 @@ static void config_registers(struct rkvdec_ctx *ctx,
> for (i = 0; i < ARRAY_SIZE(dec_params->dpb); i++) {
> struct vb2_buffer *vb_buf = get_ref_buf(ctx, run, i);
>
> - refer_addr = vb2_dma_contig_plane_dma_addr(vb_buf, 0) |
> - RKVDEC_COLMV_USED_FLAG_REF;
> + refer_addr = vb2_dma_contig_plane_dma_addr(vb_buf, 0);
>
> - if (!(dpb[i].flags & V4L2_H264_DPB_ENTRY_FLAG_FIELD))
> - refer_addr |= RKVDEC_TOPFIELD_USED_REF |
> - RKVDEC_BOTFIELD_USED_REF;
> - else if (dpb[i].flags & V4L2_H264_DPB_ENTRY_FLAG_BOTTOM_FIELD)
> - refer_addr |= RKVDEC_BOTFIELD_USED_REF;
> - else
> + if (dpb[i].flags & V4L2_H264_DPB_ENTRY_FLAG_ACTIVE)
> + refer_addr |= RKVDEC_COLMV_USED_FLAG_REF;
> + if (dpb[i].flags & V4L2_H264_DPB_ENTRY_FLAG_FIELD)
> + refer_addr |= RKVDEC_FIELD_REF;
> +
> + if (dpb[i].reference & V4L2_H264_TOP_FIELD_REF)
> refer_addr |= RKVDEC_TOPFIELD_USED_REF;
> + if (dpb[i].reference & V4L2_H264_BOTTOM_FIELD_REF)
> + refer_addr |= RKVDEC_BOTFIELD_USED_REF;
>
> writel_relaxed(dpb[i].top_field_order_cnt,
> rkvdec->regs + poc_reg_tbl_top_field[i]);
> diff --git a/include/media/h264-ctrls.h b/include/media/h264-ctrls.h
> index 9ff085fdc9ab..4447697e9465 100644
> --- a/include/media/h264-ctrls.h
> +++ b/include/media/h264-ctrls.h
> @@ -212,7 +212,6 @@ struct v4l2_ctrl_h264_slice_params {
> #define V4L2_H264_DPB_ENTRY_FLAG_ACTIVE 0x02
> #define V4L2_H264_DPB_ENTRY_FLAG_LONG_TERM 0x04
> #define V4L2_H264_DPB_ENTRY_FLAG_FIELD 0x08
> -#define V4L2_H264_DPB_ENTRY_FLAG_BOTTOM_FIELD 0x10
>
> struct v4l2_h264_dpb_entry {
> __u64 reference_ts;
> @@ -221,6 +220,7 @@ struct v4l2_h264_dpb_entry {
> /* Note that field is indicated by v4l2_buffer.field */
> __s32 top_field_order_cnt;
> __s32 bottom_field_order_cnt;
> + enum v4l2_h264_field_reference reference;
Here it is called 'references', but the same enum field in struct v4l2_h264_reference
is called 'fields' there. It's a good idea to use the same names.
Regards,
Hans
> __u32 flags; /* V4L2_H264_DPB_ENTRY_FLAG_* */
> };
>
>
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