rusty_jpeg 0.2.2

Pure-Rust JPEG/MJPEG decoder + encoder, no C/FFI. Baseline and progressive DCT, planar YUV in/out, AVX2 FDCT/quantize and a two-block AVX2 IDCT. Trellis quantization, box-averaged chroma, fuzz-tested. Encodes 1.19x faster than FFmpeg at matched output size; decodes ~1.04x faster.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48

[package]

name = "rusty_jpeg"

version = "0.2.2"

edition = "2021"

license = "(MIT OR Apache-2.0) AND IJG"

repository = "https://github.com/Remade-With-Rust/rusty_jpeg"

authors = ["Mata Network <https://www.mata.network>"]

homepage = "https://github.com/Remade-With-Rust/rusty_jpeg"

description = "Pure-Rust JPEG/MJPEG decoder + encoder, no C/FFI. Baseline and progressive DCT, planar YUV in/out, AVX2 FDCT/quantize and a two-block AVX2 IDCT. Trellis quantization, box-averaged chroma, fuzz-tested. Encodes 1.19x faster than FFmpeg at matched output size; decodes ~1.04x faster."

readme = "README.md"

keywords = ["jpeg", "mjpeg", "image", "decoder", "encoder"]

categories = ["multimedia::images", "multimedia::encoding"]

rust-version = "1.85"



[features]

# `rayon` is deliberately NOT here. Upstream `jpeg-decoder` enables it by

# default; measured on this decoder it is a net LOSS at every image size, because

# the fork-join costs more than the parallelism it buys on a single frame:

#

#   640x480    1.32x SLOWER with rayon

#   1920x1080  1.91x SLOWER

#   3840x2160  1.32x SLOWER

#

# Turning it off took 1080p decode from 6.94 to 3.82 ms/frame. The feature is

# kept so the measurement is cheap to repeat (and in case a future worker design

# changes the answer), but it must not be on by default.

default = ["std", "simd"]

std = []

# Encoder AVX2 kernels (FDCT + RGB->YCbCr). NOT default upstream, which is how

# they sat dead in this tree for the whole life of the dependency.

simd = ["std"]

# Decoder work-stealing threading.

rayon = ["dep:rayon"]

# Decoder: drop all arch-specific code (forbids unsafe outright).

platform_independent = []

nightly_aarch64_neon = []

# Exposes internal kernels for benchmarks/oracle A-B tests.

benchmark = []

# Feature-gated stage profiler; zero-cost when off.

profile = []

# Deterministic work counters (symbols, bits, flushes). SEPARATE from `profile`

# on purpose: the counters fire hundreds of millions of times inside the entropy

# coder, so enabling both makes the cycle buckets measure the instrument. Counts

# from this build; cycles from a `profile` build; never the same binary.

counters = []



[dependencies]

rayon = { version = "1.5.1", optional = true }