Subject: Re: [PATCH v8 0/3] HEVC/H.265 stateless support for V4L2 and Cedrus

From: Jernej Škrabec <[email-masked]>
Date: Tue, 08 Oct 2019 23:48:32 +0200

Dne petek, 27. september 2019 ob 16:34:08 CEST je Paul Kocialkowski 
napisal(a):
> HEVC/H.265 stateless support for V4L2 and Cedrus
> 
> 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.

Whole series is:
Reviewed-by: Jernej Skrabec <[email-masked]>

Hopefully this can be merged soon.

Best regards,
Jernej

> 
> Changes since v7:
> * Rebased on latest media tree;
> * Fixed holes in structures for cacheline alignment;
> * Added decode mode and start code controls
>   (only per-slice and no start code is supported at this point).
> 
> Changes since v6:
> * Rebased on latest media tree from Hans;
> * Reordered some fields to avoid holes and multi-padding;
> * Updated the documentation.
> 
> 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 (3):
>   media: v4l: Add definitions for HEVC stateless decoding
>   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        | 553 +++++++++++++++-
>  .../media/uapi/v4l/pixfmt-compressed.rst      |  23 +
>  .../media/uapi/v4l/vidioc-queryctrl.rst       |  18 +
>  .../media/videodev2.h.rst.exceptions          |   3 +
>  drivers/media/v4l2-core/v4l2-ctrls.c          | 108 ++-
>  drivers/media/v4l2-core/v4l2-ioctl.c          |   1 +
>  drivers/staging/media/sunxi/cedrus/Makefile   |   2 +-
>  drivers/staging/media/sunxi/cedrus/cedrus.c   |  52 +-
>  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                    | 212 ++++++
>  include/media/v4l2-ctrls.h                    |   7 +
>  17 files changed, 1907 insertions(+), 9 deletions(-)
>  create mode 100644 drivers/staging/media/sunxi/cedrus/cedrus_h265.c
>  create mode 100644 include/media/hevc-ctrls.h

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