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Jeongkeun Kim de18feb0f0 avutil/aarch64: add pixelutils 32x32 SAD NEON implementation 
This adds a NEON-optimized function for computing 32x32 Sum of Absolute
Differences (SAD) on AArch64, addressing a gap where x86 had SSE2/AVX2
implementations but AArch64 lacked equivalent coverage.

The implementation mirrors the existing sad8 and sad16 NEON functions,
employing a 4-row unrolled loop with UABAL and UABAL2 instructions for
efficient load-compute interleaving, and four 8x16-bit accumulators to
handle the wider 32-byte rows.

Benchmarks on AWS Graviton3 (Neoverse V1, c7g.xlarge) using checkasm:
  sad_32x32_0: C 146.4 cycles -> NEON  98.1 cycles (1.49x speedup)
  sad_32x32_1: C 141.4 cycles -> NEON  98.9 cycles (1.43x speedup)
  sad_32x32_2: C 140.7 cycles -> NEON  95.0 cycles (1.48x speedup)

Signed-off-by: Jeongkeun Kim <variety0724@gmail.com>
2026-04-19 19:27:55 +00:00
.forgejo .forgejo/CODEOWNERS: add myself for hls.* 2026-04-11 01:58:35 +02:00
compat avfilter/scale_cuda: fix color bleeding in lanczos scaling 2026-04-04 11:31:16 +00:00
doc doc/APIchanges: fix date and version in latest entry 2026-04-19 15:37:33 +00:00
ffbuild ffbuild/common: remove DBG=1 to preprocess external asm 2026-04-03 16:15:33 +02:00
fftools ffprobe: Support printing SMPTE 2094 APP5 side data 2026-04-14 20:41:14 +00:00
libavcodec avcodec/x86/vp3dsp: Port ff_vp3_idct_dc_add_mmxext to SSE2 2026-04-19 08:21:17 +02:00
libavdevice libavdevice/alsa.c: fix NULL pointer dereference 2026-04-19 15:00:08 +00:00
libavfilter avfilter/vf_ssim360: fix integer overflow in tape_length allocation 2026-04-13 19:49:32 +08:00
libavformat avformat/matroskaenc: Remove pointless side-data size checks 2026-04-17 23:53:12 +02:00
libavutil avutil/aarch64: add pixelutils 32x32 SAD NEON implementation 2026-04-19 19:27:55 +00:00
libswresample swresample/x86/{audio_convert,rematrix}: Remove remnants of MMX 2026-04-13 01:16:46 +02:00
libswscale swscale/x86/ops: simplify SWS_OP_CLEAR patterns 2026-04-16 23:25:17 +02:00
presets
tests libavdevice/alsa.c: fix NULL pointer dereference 2026-04-19 15:00:08 +00:00
tools fuzzer: improve documentation 2026-03-14 21:36:58 +00:00
.gitattributes gitattributes: End merge conflicts in Changelog 2025-03-17 15:26:10 +01:00
.gitignore swscale/aarch64: add NEON sws_ops backend 2026-03-30 11:38:35 +00:00
.mailmap mailmap: add entry for myself 2025-08-08 21:51:15 +00:00
Changelog aacdec: add support for 960-frame HE-AAC (DAB+) decoding 2026-04-17 16:46:52 +02:00
configure configure: collapse else + if into elif 2026-04-13 12:46:49 +00:00
CONTRIBUTING.md CONTRIBUTING.md: Add Forgejo 2026-02-22 04:39:22 +00:00
COPYING.GPLv2
COPYING.GPLv3
COPYING.LGPLv2.1 all: fix whitespace/new-line issues 2025-08-03 13:48:47 +02:00
COPYING.LGPLv3
CREDITS Use https for repository links 2023-03-01 21:59:10 +01:00
FUNDING.json Add FUNDING.json 2025-06-23 14:48:40 +02:00
INSTALL.md all: fix typos found by codespell 2025-08-03 13:48:47 +02:00
LICENSE.md Remove libpostproc 2025-05-07 15:35:47 +02:00
MAINTAINERS MAINTAINERS: add myself as HLS demuxer maintainer 2026-04-11 01:58:35 +02:00
Makefile configure: add detection of assembler support for SME2 2026-03-04 23:52:36 +02:00
README.md README: fix typo and description of libavfilter 2021-10-08 09:44:34 +05:30
RELEASE RELEASE: update to 8.0 2025-08-14 08:42:29 -04:00

README.md

FFmpeg README

FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata.

Libraries

  • libavcodec provides implementation of a wider range of codecs.
  • libavformat implements streaming protocols, container formats and basic I/O access.
  • libavutil includes hashers, decompressors and miscellaneous utility functions.
  • libavfilter provides means to alter decoded audio and video through a directed graph of connected filters.
  • libavdevice provides an abstraction to access capture and playback devices.
  • libswresample implements audio mixing and resampling routines.
  • libswscale implements color conversion and scaling routines.

Tools

  • ffmpeg is a command line toolbox to manipulate, convert and stream multimedia content.
  • ffplay is a minimalistic multimedia player.
  • ffprobe is a simple analysis tool to inspect multimedia content.
  • Additional small tools such as aviocat, ismindex and qt-faststart.

Documentation

The offline documentation is available in the doc/ directory.

The online documentation is available in the main website and in the wiki.

Examples

Coding examples are available in the doc/examples directory.

License

FFmpeg codebase is mainly LGPL-licensed with optional components licensed under GPL. Please refer to the LICENSE file for detailed information.

Contributing

Patches should be submitted to the ffmpeg-devel mailing list using git format-patch or git send-email. Github pull requests should be avoided because they are not part of our review process and will be ignored.