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Frank Barchard 08bae15669 RVV replace vnclipu.wi with vwaddu.vx and vnsrl.wi 
Estimated speedup (Before -> After):
Function                   |  X280 |  X380 |    K3 |  C920 | Coral
---------------------------+-------+-------+-------+-------+------
ScaleARGBRowDown2Box       | +8.5% | +9.8% | +9.2% | +11%  | +12%
ScaleARGBRowDownEvenBox    | +4.4% | +5.2% | +5.0% | +6.5% | +7.8%
ScaleRowDown2Box           | +7.3% | +8.4% | +7.5% | +6.8% | +5.5%
ScaleRowDown4Box           | +2.1% | +2.6% | +2.4% | +2.2% | +1.9%
ScaleRowDown34_0_Box (6x)  | +12%  | +15%  | +13%  | +14%  | +11%
ScaleRowDown34_1_Box (2x)  | +6.9% | +8.2% | +7.4% | +7.8% | +6.2%
ScaleUVRowDown2Box (2x)    | +6.0% | +7.1% | +6.4% | +6.1% | +5.2%
InterpolateRow             | +9.8% | +11%  | +10%  | +9.5% | +8.3%
HalfWidthRow_16To8         | +9.1% | +10%  | +9.6% | +11%  | +11%

Coral Verilator
Function (Coral Kelvin)  | Bef | Aft | Cyc/Px (B->A) | Change
-------------------------+-----+-----+---------------+------------
ScaleARGBRowDown2Box     | 512 | 510 |  4.00 -> 3.98 |  -2 (+0.4%)
ScaleARGBRowDownEvenBox  | 512 | 509 |  4.00 -> 3.98 |  -3 (+0.6%)
ScaleRowDown2Box         | 135 | 138 |  1.05 -> 1.08 |  +3 (-2.2%)
ScaleRowDown4Box         | 365 | 380 |  2.85 -> 2.97 | +15 (-4.1%)
ScaleRowDown34_0_Box     | 162 | 163 |  1.35 -> 1.36 |  +1 (-0.6%)
ScaleRowDown34_1_Box     | 124 | 125 |  1.03 -> 1.04 |  +1 (-0.8%)
ScaleUVRowDown2Box       | 231 | 245 |  1.80 -> 1.91 | +14 (-6.1%)
InterpolateRow           | 101 | 101 |  0.79 -> 0.79 |   0 ( 0.0%)
HalfWidthRow_16To8       | 290 | 287 |  2.27 -> 2.24 |  -3 (+1.0%)


Bug: libyuv:956
Change-Id: I2498f7238dae530c4acef49891fd1991acbdc94b
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/8448870
Reviewed-by: David Gao <davidgao@google.com>
Commit-Queue: Frank Barchard <fbarchard@google.com>
2026-09-25 12:43:28 -07:00
build_overrides [vpython] Migrate .vpython3 to vpython.toml 2026-09-18 00:28:26 -07:00
docs convert, scale: Add P010/P210/P410 convert paths and NV16/NV24/Px10 scale 2026-09-23 20:43:22 -07:00
include I422ToRGB24 avx512bw tail and row coalesce 2026-09-24 12:07:29 -07:00
infra/config Use default xcode version in libyuv 2025-11-24 07:54:14 -08:00
riscv_script Support RVV v0.12 intrinsics for row_rvv.cc & scale_rvv.cc 2024-06-17 18:01:49 +00:00
source RVV replace vnclipu.wi with vwaddu.vx and vnsrl.wi 2026-09-25 12:43:28 -07:00
tools_libyuv Remove libyuv dependency on base/ 2025-01-08 09:04:21 -08:00
unit_test I422ToRGB24 avx512bw tail and row coalesce 2026-09-24 12:07:29 -07:00
util [libyuv] Keep LIBYUV_API in basic_types.h and remove legacy types and bool macros 2026-08-28 08:32:19 -07:00
.clang-format clang-format libyuv 2016-11-07 17:37:23 -08:00
.gitignore DetilePlane and unittest for NEON 2022-01-31 20:05:55 +00:00
.gn Set use_siso=true by default in .gn 2025-06-23 23:50:32 -07:00
Android.bp [libyuv] Update build files with missing sources and sort lists 2026-09-03 11:02:07 -07:00
Android.mk [libyuv] Update build files with missing sources and sort lists 2026-09-03 11:02:07 -07:00
AUTHORS Fix same-width vertical point upsampling 2026-08-24 19:28:50 -07:00
BUILD.bazel [libyuv] Use Armv8.5-A architecture flags for SME and SVE2 build targets 2026-09-09 09:17:24 -07:00
BUILD.gn [libyuv] Use Armv8.5-A architecture flags for SME and SVE2 build targets 2026-09-09 09:17:24 -07:00
CM_linux_packages.cmake Use grep extended regex for version 2024-11-13 02:11:17 +00:00
CMakeLists.txt [libyuv] Use Armv8.5-A architecture flags for SME and SVE2 build targets 2026-09-09 09:17:24 -07:00
codereview.settings [infra] remove no longer supported git cl upload setting. 2021-04-28 12:47:52 +00:00
DEPS [DEPS] Add CPython CIPD package for hermetic Python toolchain 2026-08-19 20:31:30 -07:00
DIR_METADATA Move metadata in OWNERS files to DIR_METADATA files 2021-02-09 19:34:43 +00:00
download_vs_toolchain.py Update pylintrc to a pep-8 like style 2024-12-18 05:38:56 -08:00
GEMINI.md GEMINI.md: Update Arm wording and guidance 2026-08-18 11:21:14 -07:00
libyuv.bzl [libyuv] Simplify RVV configuration in BUILD.bazel and libyuv.bzl 2026-09-08 17:50:17 -07:00
libyuv.gni row_win.cc rewrite into intrinsics 2026-04-15 19:53:16 -07:00
libyuv.gyp Stop setting --dynamic-linker for target_os="android" 2026-05-27 04:34:07 -07:00
libyuv.gypi [libyuv] Update build files with missing sources and sort lists 2026-09-03 11:02:07 -07:00
LICENSE Update Copyright notice to follow new chromium conventions. 2012-08-08 19:04:24 +00:00
linux.mk Deprecate MIPS and MSA support. 2025-10-16 12:20:40 -07:00
OWNERS Remove magjed from OWNERS 2026-08-24 10:43:21 -07:00
PATENTS LibYuv: Adding PATENT and LICENSE files 2011-10-25 16:15:49 +00:00
PRESUBMIT.py Update pylintrc to a pep-8 like style 2024-12-18 05:38:56 -08:00
public.mk use unix line endings 2018-06-20 23:19:59 +00:00
pylintrc Update pylintrc to a pep-8 like style 2024-12-18 05:38:56 -08:00
README.chromium RVV port to inline from intrinsics 2026-09-21 14:26:26 -07:00
README.md Update README.md and environment_variables.md for Arm 2024-09-20 00:29:33 +00:00
vpython.toml [vpython] Migrate .vpython3 to vpython.toml 2026-09-18 00:28:26 -07:00
vpython.toml.uv.lock [vpython] Migrate .vpython3 to vpython.toml 2026-09-18 00:28:26 -07:00
winarm.mk NV12 Copy, include scale_uv.h 2020-12-08 18:54:16 +00:00
WORKSPACE.bazel Add Bazel build support 2026-04-15 18:20:26 -07:00

README.md

libyuv is an open source project that includes YUV scaling and conversion functionality.

  • Scale YUV to prepare content for compression, with point, bilinear or box filter.
  • Convert to YUV from webcam formats for compression.
  • Convert to RGB formats for rendering/effects.
  • Rotate by 90/180/270 degrees to adjust for mobile devices in portrait mode.
  • Optimized for SSSE3/AVX2 on x86/x64.
  • Optimized for Neon/SVE2/SME on Arm.
  • Optimized for MSA on Mips.
  • Optimized for RVV on RISC-V.

Development

See Getting started for instructions on how to get started developing.

You can also browse the docs directory for more documentation.