[FFmpeg-devel] [PATCH v5 1/2][GSoC 2024] libavcodec/x86/vvc: Add AVX2 DMVR SAD functions for VVC

[Ronald S. Bultje]

Hi,

On Tue, May 21, 2024 at 8:01 PM Stone Chen <chen.stonechen at gmail.com> wrote:

> Implements AVX2 DMVR (decoder-side motion vector refinement) SAD
> functions. DMVR SAD is only calculated if w >= 8, h >= 8, and w * h > 128.
> To reduce complexity, SAD is only calculated on even rows. This is
> calculated for all video bitdepths, but the values passed to the function
> are always 16bit (even if the original video bitdepth is 8). The AVX2
> implementation uses min/max/sub.
>
> Additionally this changes parameters dx and dy from int to intptr_t. This
> allows dx & dy to be used as pointer offsets without needing to use movsxd.
>
> Benchmarks ( AMD 7940HS )
> Before:
> BQTerrace_1920x1080_60_10_420_22_RA.vvc | 106.0 |
> Chimera_8bit_1080P_1000_frames.vvc | 204.3 |
> NovosobornayaSquare_1920x1080.bin | 197.3 |
> RitualDance_1920x1080_60_10_420_37_RA.266 | 174.0 |
>
> After:
> BQTerrace_1920x1080_60_10_420_22_RA.vvc | 109.3 |
> Chimera_8bit_1080P_1000_frames.vvc | 216.0 |
> NovosobornayaSquare_1920x1080.bin | 204.0|
> RitualDance_1920x1080_60_10_420_37_RA.266 | 181.7 |
> ---
>  libavcodec/vvc/dsp.c             |   2 +-
>  libavcodec/vvc/dsp.h             |   2 +-
>  libavcodec/x86/vvc/Makefile      |   3 +-
>  libavcodec/x86/vvc/vvc_sad.asm   | 130 +++++++++++++++++++++++++++++++
>  libavcodec/x86/vvc/vvcdsp_init.c |   6 ++
>  5 files changed, 140 insertions(+), 3 deletions(-)
>  create mode 100644 libavcodec/x86/vvc/vvc_sad.asm
>

LGTM.

Ronald