Date:   Mon, 22 Jul 2019 16:41:09 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        devel@...verdev.osuosl.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...glegroups.com
Cc:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Ezequiel Garcia <ezequiel@...labora.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Alexandre Courbot <acourbot@...omium.org>,
        Nicolas Dufresne <nicolas@...fresne.ca>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Jonas Karlman <jonas@...boo.se>
Subject: Re: [PATCH v6 0/5] HEVC/H.265 stateless support for V4L2 and Cedrus

On 7/22/19 3:17 PM, Paul Kocialkowski wrote:
> Hi,
> 
> Any feedback on this series? I think it was pretty much ready for merge
> regarding the comments received so far.
> 
> I could craft a rebased v7, with or without additional changes, if needed.

Just gave feedback. A v7 is needed in any case since it needs to be rebased.

Regards,

	Hans

> 
> What do you think?
> 
> Cheers,
> 
> Paul
> 
> On Fri 14 Jun 19, 16:38, Paul Kocialkowski wrote:
>> This is early support for HEVC/H.265 stateless decoding in V4L2,
>> including both definitions and driver support for the Cedrus VPU
>> driver, which concerns Allwinner devices.
>>
>> A specific pixel format is introduced for the HEVC slice format and
>> controls are provided to pass the bitstream metadata to the decoder.
>> Some bitstream extensions are intentionally not supported at this point.
>>
>> Since this is the first proposal for stateless HEVC/H.265 support in
>> V4L2, reviews and comments about the controls definitions are
>> particularly welcome.
>>
>> On the Cedrus side, the H.265 implementation covers frame pictures
>> with both uni-directional and bi-direction prediction modes (P/B
>> slices). Field pictures (interleaved), scaling lists and 10-bit output
>> are not supported at this point.
>>
>> This series is based upon the following series:
>> * media: cedrus: Add H264 decoding support
>>
>> Changes since v5:
>> * Rebased atop latest next media tree;
>> * Moved to flags instead of u8 fields;
>> * Added padding to ensure 64-bit alignment
>>   (tested with GDB on 32 and 64-bit architectures);
>> * Reworked cedrus H.265 driver support a bit for flags;
>> * Split off codec-specific control validation and init;
>> * Added HEVC controls fields cleanup at std_validate to allow reliable
>>   control comparison with memcmp;
>> * Fixed various misc reported mistakes.
>>
>> Changes since v4:
>> * Rebased atop latest H.254 series.
>>
>> Changes since v3:
>> * Updated commit messages;
>> * Updated CID base to avoid conflicts;
>> * Used cpu_to_le32 for packed le32 data;
>> * Fixed misc minor issues in the drive code;
>> * Made it clear in the docs that the API will evolve;
>> * Made the pixfmt private and split commits about it.
>>
>> Changes since v2:
>> * Moved headers to non-public API;
>> * Added H265 capability for A64 and H5;
>> * Moved docs to ext-ctrls-codec.rst;
>> * Mentionned sections of the spec in the docs;
>> * Added padding to control structures for 32-bit alignment;
>> * Made write function use void/size in bytes;
>> * Reduced the number of arguments to helpers when possible;
>> * Removed PHYS_OFFSET since we already set PFN_OFFSET;
>> * Added comments where suggested;
>> * Moved to timestamp for references instead of index;
>> * Fixed some style issues reported by checkpatch.
>>
>> Changes since v1:
>> * Added a H.265 capability to whitelist relevant platforms;
>> * Switched over to tags instead of buffer indices in the DPB
>> * Declared variable in their reduced scope as suggested;
>> * Added the H.265/HEVC spec to the biblio;
>> * Used in-doc references to the spec and the required APIs;
>> * Removed debugging leftovers.
>>
>> Cheers!
>>
>> Paul Kocialkowski (5):
>>   media: v4l2-ctrls: Split off MPEG-2 controls validation
>>   media: v4l2-ctrls: Split off MPEG-2 controls initialization
>>   media: v4l: Add definitions for the HEVC slice controls
>>   media: pixfmt: Document the HEVC slice pixel format
>>   media: cedrus: Add HEVC/H.265 decoding support
>>
>>  Documentation/media/uapi/v4l/biblio.rst       |   9 +
>>  .../media/uapi/v4l/ext-ctrls-codec.rst        | 474 +++++++++++++-
>>  .../media/uapi/v4l/pixfmt-compressed.rst      |  21 +
>>  .../media/uapi/v4l/vidioc-queryctrl.rst       |  18 +
>>  .../media/videodev2.h.rst.exceptions          |   3 +
>>  drivers/media/v4l2-core/v4l2-ctrls.c          | 231 +++++--
>>  drivers/media/v4l2-core/v4l2-ioctl.c          |   1 +
>>  drivers/staging/media/sunxi/cedrus/Makefile   |   2 +-
>>  drivers/staging/media/sunxi/cedrus/cedrus.c   |  31 +-
>>  drivers/staging/media/sunxi/cedrus/cedrus.h   |  18 +
>>  .../staging/media/sunxi/cedrus/cedrus_dec.c   |   9 +
>>  .../staging/media/sunxi/cedrus/cedrus_h265.c  | 616 ++++++++++++++++++
>>  .../staging/media/sunxi/cedrus/cedrus_hw.c    |   4 +
>>  .../staging/media/sunxi/cedrus/cedrus_regs.h  | 271 ++++++++
>>  .../staging/media/sunxi/cedrus/cedrus_video.c |  10 +
>>  include/media/hevc-ctrls.h                    | 197 ++++++
>>  include/media/v4l2-ctrls.h                    |   7 +
>>  17 files changed, 1860 insertions(+), 62 deletions(-)
>>  create mode 100644 drivers/staging/media/sunxi/cedrus/cedrus_h265.c
>>  create mode 100644 include/media/hevc-ctrls.h
>>
>> -- 
>> 2.21.0
>>
> 

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