| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <981458bfa639bbb9dbc7577256fde0a4c6259d53.camel@ndufresne.ca>
Date: Fri, 05 Jun 2020 13:13:24 -0400
From: Nicolas Dufresne <nicolas@...fresne.ca>
To: Jernej Skrabec <jernej.skrabec@...l.net>,
paul.kocialkowski@...tlin.com, mripard@...nel.org
Cc: mchehab@...nel.org, wens@...e.org, hverkuil-cisco@...all.nl,
gregkh@...uxfoundation.org, jonas@...boo.se,
linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
devel@...verdev.osuosl.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/3] media: uapi: h264: update reference lists
Sorry, missed one thing.
Le vendredi 05 juin 2020 à 13:08 -0400, Nicolas Dufresne a écrit :
> Le jeudi 04 juin 2020 à 20:57 +0200, Jernej Skrabec a écrit :
> > When dealing with with interlaced frames, reference lists must tell if
> > each particular reference is meant for top or bottom field. This info
> > is currently not provided at all in the H264 related controls.
> >
> > Make reference lists hold a structure which will also hold flags along
> > index into DPB array. Flags will tell if reference is meant for top or
> > bottom field.
> >
> > Currently the only user of these lists is Cedrus which is just compile
> > fixed here. Actual usage of newly introduced flags will come in
> > following commit.
> >
> > Signed-off-by: Jernej Skrabec <jernej.skrabec@...l.net>
>
> This looks like the right approach to me and is extensible if anything
> else is needed for MVC and SVC special referencing (at least will be
> enough for what H.264 actually supports in this regard).
>
> Reviewed-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
>
> > ---
> > .../media/v4l/ext-ctrls-codec.rst | 40 ++++++++++++++++++-
> > .../staging/media/sunxi/cedrus/cedrus_h264.c | 6 +--
> > include/media/h264-ctrls.h | 12 +++++-
> > 3 files changed, 51 insertions(+), 7 deletions(-)
> >
> > diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> > index d0d506a444b1..6c36d298db20 100644
> > --- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> > +++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
> > @@ -1843,10 +1843,10 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type -
> > * - __u32
> > - ``slice_group_change_cycle``
> > -
> > - * - __u8
> > + * - struct :c:type:`v4l2_h264_reference`
> > - ``ref_pic_list0[32]``
> > - Reference picture list after applying the per-slice modifications
> > - * - __u8
> > + * - struct :c:type:`v4l2_h264_reference`
> > - ``ref_pic_list1[32]``
> > - Reference picture list after applying the per-slice modifications
> > * - __u32
> > @@ -1926,6 +1926,42 @@ enum v4l2_mpeg_video_h264_hierarchical_coding_type -
> > - ``chroma_offset[32][2]``
> > -
> >
> > +``Picture Reference``
> > +
> > +.. c:type:: v4l2_h264_reference
> > +
> > +.. cssclass:: longtable
> > +
> > +.. flat-table:: struct v4l2_h264_reference
> > + :header-rows: 0
> > + :stub-columns: 0
> > + :widths: 1 1 2
> > +
> > + * - __u16
> > + - ``flags``
> > + - See :ref:`Picture Reference Flags <h264_reference_flags>`
> > + * - __u8
> > + - ``index``
> > + -
> > +
> > +.. _h264_reference_flags:
> > +
> > +``Picture Reference Flags``
> > +
> > +.. cssclass:: longtable
> > +
> > +.. flat-table::
> > + :header-rows: 0
> > + :stub-columns: 0
> > + :widths: 1 1 2
> > +
> > + * - ``V4L2_H264_REFERENCE_FLAG_TOP_FIELD``
> > + - 0x00000001
> > + -
> > + * - ``V4L2_H264_REFERENCE_FLAG_BOTTOM_FIELD``
> > + - 0x00000002
> > + -
> > +
> > ``V4L2_CID_MPEG_VIDEO_H264_DECODE_PARAMS (struct)``
> > Specifies the decode parameters (as extracted from the bitstream)
> > for the associated H264 slice data. This includes the necessary
> > diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
> > index 54ee2aa423e2..cce527bbdf86 100644
> > --- a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
> > +++ b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c
> > @@ -166,8 +166,8 @@ static void cedrus_write_frame_list(struct cedrus_ctx *ctx,
> >
> > static void _cedrus_write_ref_list(struct cedrus_ctx *ctx,
> > struct cedrus_run *run,
> > - const u8 *ref_list, u8 num_ref,
> > - enum cedrus_h264_sram_off sram)
> > + const struct v4l2_h264_reference *ref_list,
> > + u8 num_ref, enum cedrus_h264_sram_off sram)
> > {
> > const struct v4l2_ctrl_h264_decode_params *decode = run->h264.decode_params;
> > struct vb2_queue *cap_q;
> > @@ -188,7 +188,7 @@ static void _cedrus_write_ref_list(struct cedrus_ctx *ctx,
> > int buf_idx;
> > u8 dpb_idx;
> >
> > - dpb_idx = ref_list[i];
> > + dpb_idx = ref_list[i].index;
> > dpb = &decode->dpb[dpb_idx];
> >
> > if (!(dpb->flags & V4L2_H264_DPB_ENTRY_FLAG_ACTIVE))
> > diff --git a/include/media/h264-ctrls.h b/include/media/h264-ctrls.h
> > index 080fd1293c42..9b1cbc9bc38e 100644
> > --- a/include/media/h264-ctrls.h
> > +++ b/include/media/h264-ctrls.h
> > @@ -140,6 +140,14 @@ struct v4l2_h264_pred_weight_table {
> > #define V4L2_H264_SLICE_FLAG_DIRECT_SPATIAL_MV_PRED 0x04
> > #define V4L2_H264_SLICE_FLAG_SP_FOR_SWITCH 0x08
> >
> > +#define V4L2_H264_REFERENCE_FLAG_TOP_FIELD 0x01
> > +#define V4L2_H264_REFERENCE_FLAG_BOTTOM_FIELD 0x02
> > +
> > +struct v4l2_h264_reference {
> > + __u8 flags;
> > + __u8 index;
> > +};
> > +
> > struct v4l2_ctrl_h264_slice_params {
> > /* Size in bytes, including header */
> > __u32 size;
> > @@ -182,8 +190,8 @@ struct v4l2_ctrl_h264_slice_params {
> > * Entries on each list are indices into
> > * v4l2_ctrl_h264_decode_params.dpb[].
> > */
This comment needs to be updated or moved inside the structure.
> > - __u8 ref_pic_list0[32];
> > - __u8 ref_pic_list1[32];
> > + struct v4l2_h264_reference ref_pic_list0[32];
> > + struct v4l2_h264_reference ref_pic_list1[32];
> >
> > __u32 flags;
> > };
Powered by blists - more mailing lists