prec

Copyright (c) 2026 Cătălin Ilinca

The code is under the MIT licence in LICENSE. The prec binary also carries

these third-party files, compiled in, each under its own MIT licence below:

- assets/xterm/: xterm.js 5.5.0, @xterm/addon-canvas 0.7.0 and

@xterm/addon-unicode11 0.8.0 (https://github.com/xtermjs/xterm.js),

vendored as published; assets/xterm/VERSIONS lists their sha256.

- assets/vhs-themes.json: the built-in theme set of VHS v0.11.0

(https://github.com/charmbracelet/vhs), extracted verbatim.

- pito-codecs 2.1.0 (https://github.com/gmrdad82/pito-codecs, tag v2.1.0,

commit 10ac87cb1edb247422c0a0e5da53d3f70514a3a0), compiled in with its

h264, mp4, filter and png parts to encode clip masters; its MIT licence and

the notices of the work it adapts are copied verbatim at the end of this file.

The images in docs/images/ illustrate the README and the docs bundle. The

GIFs record.gif and typing.gif are recorded by prec from this repository's own

shots (render/terminal.toml's record and examples/demo's typing) and made GIFs

by pcod (pito-codecs), under the MIT licence like the code. The stills are

prec renders of examples/demo's palette shot: themes.png (six themes from one

recording), frame.png (window and bare) and sizes.png (a crop of the 720p and

2160p stills), laid out with ImageMagick. The charts frames-vs-vhs.png and

rerender.png are drawn by pito-compare (pcmp) from docs/bench/*.toml, with

numbers measured by docs/bench/bench.sh against VHS v0.11.0. All are under the

MIT licence like the code.

The PITO MD wordmark docs/images/pitomd-wordmark.svg, shown at the README's

Licence section, is copied by bin/marks from the PITO MD brand masters

(exports/pitomd/readme/wordmark.svg) at aa3aee8b232a1b848995bf3d9a012a01d4aff8ec.

The prec and PITO MD names and their logos are © Catalin Ilinca, all rights

reserved and not covered by the MIT licence (TRADEMARKS.md).

----- assets/xterm/LICENSE

Copyright (c) 2017-2019, The xterm.js authors (https://github.com/xtermjs/xterm.js)

Copyright (c) 2014-2016, SourceLair Private Company (https://www.sourcelair.com)

Copyright (c) 2012-2013, Christopher Jeffrey (https://github.com/chjj/)

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in

all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

THE SOFTWARE.

----- assets/xterm/LICENSE-addon-canvas

Copyright (c) 2017, The xterm.js authors (https://github.com/xtermjs/xterm.js)

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in

all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

THE SOFTWARE.

----- assets/xterm/LICENSE-addon-unicode11

Copyright (c) 2019, The xterm.js authors (https://github.com/xtermjs/xterm.js)

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in

all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

THE SOFTWARE.

----- assets/LICENSE-vhs

MIT License

Copyright (c) 2022-2023 Charmbracelet, Inc

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all

copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

SOFTWARE.

----- pito-codecs 2.1.0 LICENSE

MIT License

Copyright (c) 2026 Cătălin Ilinca

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all

copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

SOFTWARE.

----- pito-codecs 2.1.0 NOTICE

Parts of this package are adapted from FilmCraft

(https://github.com/storytold/filmcraft, tag v0.6.0, commit 2ff3f5e266838700c292a35aaf762e3d4dcef980),

Copyright (c) 2026 ArtCraft Team and the FilmCraft contributors, used under

the MIT License (FilmCraft is dual-licensed MIT OR Apache-2.0; the MIT terms

are taken here):

MIT License

Copyright (c) 2026 ArtCraft Team and the FilmCraft contributors

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all

copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

SOFTWARE.

Adapted modules (one line per module, filled in by each task):

- src/h264/: from crates/h264 (the H.264 decoder), crates/h264enc (the encoder) and crates/bitstream (bit reader and writer).

- src/hevc/: from crates/hevc (the H.265 decoder) and crates/bitstream (bit reader, NAL splitting); adapted to the shared Frame and Packet types, with an hvcC writer added.

- src/aac/: from crates/aac (the AAC-LC decoder and encoder) and crates/bitstream; src/aac/pcm.rs is new. The radix-2 FFT of its MDCT moved unchanged to src/media/fft.rs, which the spectrogram shares.

- src/mp4/: from crates/isobmff (the MP4 and MOV reader and writer); remux, the MOV brand and the vp09 sample entry are new.

- src/gpu/: decode from crates/platform/src/vaapi (the VA-API front ends, libva FFI and session) and crates/platform/src/biplanar.rs, with the H.264 and HEVC parameter, slice and DPB code of crates/h264 and crates/hevc in src/gpu/syntax; the VA-API encoders, packed headers, VPP and dma-buf export are new.

- src/gpu/nvenc/: from crates/platform/src/nvenc (ffi, session, device, HEVC).

- src/gpu/videotoolbox/: from crates/platform/src/videotoolbox.rs and videotoolbox_encode.rs.

- src/gpu/media_foundation/: from crates/platform/src/media_foundation and crates/platform/src/annexb.rs.

- src/filter/: the EBU R128 meter (K-weighting filters, gating histogram, loudness range) and the true-peak polyphase oversampler from crates/audio-dsp; the rest is new, the spectrogram in src/filter/spectrum.rs included, with its colour stops sampled from matplotlib's inferno colour map (CC0 1.0, Nathaniel J. Smith and Stefan van der Walt) and its 5x7 glyphs taken from this package's bench charts.

- src/vp9/: the VP9 decoder from crates/vp9 (header and superframe parsing, boolean decoder, probability adaptation, tiles, prediction, transforms, loop filter, frame threading); the shared Frame and Packet front and the bit reader (from crates/bitstream) are adapted.

- src/opus/: the decoder (SILK, CELT, hybrid, multistream, OpusHead) from crates/opus; the range encoder, the FFT butterflies and the Ogg reader and writer are new.

- src/mkv/: the Matroska and WebM reader (EBML, lacing, Cues, damage resync) from crates/matroska; the writer, remux and MP4 to MKV are reworked or new.

- src/vp9/enc/: the VP9 encoder; its motion vector prediction (mvref.rs) and the syntax contexts of entropy.rs mirror crates/vp9's tile.rs, and it reuses the decoder's tables, probability adaptation and loop filter; the rest is new.

- src/gif/: written from the GIF89a specification; the encoder's frame differencing, its clamped Sierra-2-4A diffusion and its 7-bit nearest-colour table in src/gif/encode.rs are adapted from pconv v1.0.1 (commit 8879614b928b8fdde500a16376b85a2c95551dc9), Copyright (c) 2026 Cătălin Ilinca, MIT, the same author and licence as this package.

- src/vp9/enc/tx/: the inverse DCT and ADST butterflies (transform_gen.rs), the scan, band and energy-class tables and the coefficient-context neighbours from crates/vp9; the forward transforms (the transposes of those butterflies), the quantiser, the trellis and the AVX2 kernels are new.

- src/webp/: new, written from RFC 9649 (the container, VP8L lossless and animation); src/webp/vp8/ is described below; the lossy animation sub-frames (the quality-to-difference limit, similar-pixel rectangles and flattened similar 8x8 blocks) in src/webp/anim.rs follow libwebp's anim_encode.c.

- src/opus/enc/: the CELT encoder is new, written from RFC 6716; it shares the decoder's tables and range coder.

The VA-API declarations in src/gpu/vaapi/ffi.rs are transcribed from libva's

headers (va.h, va_dec_hevc.h, va_enc_h264.h, va_enc_hevc.h, va_vpp.h, va_drm.h,

va_drmcommon.h; libva 2.23, https://github.com/intel/libva), which carry this

notice:

Copyright (c) 2007-2009 Intel Corporation. All Rights Reserved.

Permission is hereby granted, free of charge, to any person obtaining a

copy of this software and associated documentation files (the

"Software"), to deal in the Software without restriction, including

without limitation the rights to use, copy, modify, merge, publish,

distribute, sub license, and/or sell copies of the Software, and to

permit persons to whom the Software is furnished to do so, subject to

the following conditions:

The above copyright notice and this permission notice (including the

next paragraph) shall be included in all copies or substantial portions

of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.

IN NO EVENT SHALL INTEL AND/OR ITS SUPPLIERS BE LIABLE FOR

ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,

TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE

SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

The NVENC declarations in src/gpu/nvenc/ffi.rs are transcribed from NVIDIA's

nvEncodeAPI.h (Video Codec SDK, API 12.1), which carries this notice:

Copyright (c) 2010-2023 NVIDIA Corporation

Permission is hereby granted, free of charge, to any person

obtaining a copy of this software and associated documentation

files (the "Software"), to deal in the Software without

restriction, including without limitation the rights to use,

copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the software, and to permit persons to whom the

software is furnished to do so, subject to the following

conditions:

The above copyright notice and this permission notice shall be

included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES

OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT

HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,

WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR

OTHER DEALINGS IN THE SOFTWARE.

src/webp/vp8/ (the VP8 lossy codec of WebP) is written from RFC 6386 and

RFC 9649. Its loop filter, intra prediction, token and transform details

follow the reference decoder published in RFC 6386, Section 20, and its YUV

to RGB conversion, fancy chroma upsampler, SSE2 loop filter layout, forward

transforms and quality scale are adapted from libwebp (v1.6.0,

https://chromium.googlesource.com/webm/libwebp). They carry these notices:

RFC 6386 reference decoder:

Copyright (c) 2010, 2011, Google Inc. All rights reserved.

Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions

are met:

* Redistributions of source code must retain the above copyright

notice, this list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright

notice, this list of conditions and the following disclaimer in

the documentation and/or other materials provided with the

distribution.

* Neither the name of Google nor the names of its contributors may

be used to endorse or promote products derived from this software

without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,

INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,

BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS

OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED

AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT

LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY

WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

POSSIBILITY OF SUCH DAMAGE.

libwebp:

Copyright (c) 2010, Google Inc. All rights reserved.

Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions are

met:

* Redistributions of source code must retain the above copyright

notice, this list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright

notice, this list of conditions and the following disclaimer in

the documentation and/or other materials provided with the

distribution.

* Neither the name of Google nor the names of its contributors may

be used to endorse or promote products derived from this software

without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

The AC-3 and E-AC-3 decoder in src/ac3/ is adapted from oxideav-ac3

(https://github.com/OxideAV/oxideav-ac3, version 0.0.11, commit

99228831d2b29a35fe2b2035118a18f8cb0cae59), which is written from ATSC A/52

and ETSI TS 102 366: its syncframe and bit stream information parsing,

exponent decoding, parametric bit allocation, mantissa dequantisation,

coupling, rematrixing, spectral extension, adaptive hybrid transform (with its

vector quantisation tables) and IMDCT structure. The batched SIMD IMDCT, the

computed KBD window, the cached bit allocation, the channel layout and the

container wiring are new. It carries this notice:

MIT License

Copyright (c) 2026 Karpelès Lab Inc.

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all

copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

SOFTWARE.

The MPEG audio decoder in src/mp3/ (layers I, II and III: frame sync, side

information, scale factors, Huffman decoding, stereo processing, the IMDCT and

the polyphase synthesis with its SSE and NEON layout, and their tables, and

the VBR-tag, ID3 and gapless handling of minimp3_ex.h) is ported from minimp3 (https://github.com/lieff/minimp3, commit

ea99364f61c14656440e8d77e9c233ccf3124633) by lieff, which its authors

dedicated to the public domain under CC0 1.0 Universal:

To the extent possible under law, the author(s) have dedicated all copyright

and related and neighboring rights to this software to the public domain

worldwide. This software is distributed without any warranty.

The CC0 1.0 Universal text, as minimp3 ships it:

CC0 1.0 Universal

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Images in this repository that are not code, where each comes from, and what

covers it, all under the MIT licence like the code:

- docs/images/decode.gif and strip.gif: terminal clips recorded by prec from

this repository's own shots (render/terminal.toml and render/terminal/),

running src/bin/pcod.rs over a clip render/terminal/clip.sh makes from the

public-domain NASA solstice interview

- docs/images/chart-*.png: charts drawn by pito-compare (MIT) from the data

files in docs/charts/, which hold this repository's own measurements on

public-domain NASA footage ("A Message of Resilience from the International

Space Station" and the NASA solstice interview) and on synthetic test

patterns (ffmpeg's testsrc2)

- docs/images/filmstrip.gif, overlay.gif, animated.gif and animated.webp:

pictures examples/readme_shots.rs makes with this repository's own decoders,

overlay blend and GIF and WebP encoders from public-domain NASA footage ("A

Message of Resilience from the International Space Station", NASA Johnson)

The PNG encoder in src/png/encode.rs is adapted from fdeflate 0.3.7 (commit

c365c7e6ffa81feb2e1fb762eed7299f05c9b0ca) of https://github.com/image-rs/fdeflate,

by The image-rs Developers, dual-licensed MIT OR Apache-2.0; the MIT terms are

taken here. From fdeflate: the fixed Huffman code tuned for filtered PNG rows,

its precomputed dynamic-block header, the zero-run encoding and the 64-bit bit

writer. The Paeth filter pass, the chunk writer and the CRC are new. It

carries this notice:

MIT License

Permission is hereby granted, free of charge, to any

person obtaining a copy of this software and associated

documentation files (the "Software"), to deal in the

Software without restriction, including without

limitation the rights to use, copy, modify, merge,

publish, distribute, sublicense, and/or sell copies of

the Software, and to permit persons to whom the Software

is furnished to do so, subject to the following

conditions:

The above copyright notice and this permission notice

shall be included in all copies or substantial portions

of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF

ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED

TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A

PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT

SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY

CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION

OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR

IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER

DEALINGS IN THE SOFTWARE.

The PNG decoder in src/png/ is adapted from zune-png 0.4.10 (commit

aaf40839ed2596fa83091ccfb49629eb5d8efd91) and zune-inflate 0.2.54 (commit

69502ce83fdfecdd0beefd677e2abb3781b29d98), both of

https://github.com/etemesi254/zune-image, dual-licensed MIT OR Apache-2.0 OR

Zlib; the MIT terms are taken here. From zune-inflate: the whole-buffer zlib

and deflate decoder with its decode tables, fast and slow loops and match

copies (src/png/inflate.rs). From zune-png: the scanline de-filters with their

SSE2 and SSE4.1 kernels (src/png/filter.rs), the chunk and IHDR checks, the

bit unpacking, palette and tRNS expansion and the Adam7 pass geometry

(src/png/mod.rs). The row loop that expands every colour type straight to

8-bit RGBA, the reused buffers and the error paths are new. They carry this

notice:

MIT License

Copyright (c) 2023 Caleb Etemesi

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all

copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

SOFTWARE.

zune-inflate is itself a port of libdeflate's decompressor

(https://github.com/ebiggers/libdeflate), which carries this notice:

Copyright 2016 Eric Biggers

Permission is hereby granted, free of charge, to any person

obtaining a copy of this software and associated documentation files

(the "Software"), to deal in the Software without restriction,

including without limitation the rights to use, copy, modify, merge,

publish, distribute, sublicense, and/or sell copies of the Software,

and to permit persons to whom the Software is furnished to do so,

subject to the following conditions:

The above copyright notice and this permission notice shall be

included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS

BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

SOFTWARE.

The Adler-32 in src/png/inflate.rs follows adler2 2.0.1

(https://github.com/oyvindln/adler2, commit

89a031a0f42eeff31c70dc598b398cbf31f1680f) by Jonas Schievink and oyvindln,

licensed 0BSD OR MIT OR Apache-2.0; it is used under the 0BSD terms, which ask

for no notice, and is credited here.

The CRC-32 in src/png/crc.rs follows the slice-by-16 baseline of crc32fast

1.5.2 (https://github.com/srijs/rust-crc32fast, commit

7eb0b8a2c9b246d27dc4cb5a53d3fc3b43a4bb83), dual-licensed MIT OR Apache-2.0; the

MIT terms are taken here, under this notice:

Copyright (c) 2018 Sam Rijs, Alex Crichton and contributors

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all

copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

SOFTWARE.

The JPEG encoder in src/jpeg/ is adapted from jpeg-encoder 0.7.1

(https://github.com/vstroebel/jpeg-encoder, commit

baf40191ae25a32e56a884fa6e001c4fe938d451), licensed (MIT OR Apache-2.0) AND

IJG; the MIT terms are taken for its own code. From it: the baseline

interleaved scan, the quality-scaled Annex K quantisation tables and their

reciprocal quantiser, the Annex K Huffman tables and code construction, the

64-bit bit writer with byte stuffing, the marker writers, the integer RGB to

YCbCr conversion and its AVX2 form, the 2x2 box downsampling with libjpeg's

alternating bias and the edge replication. Changed here: one fixed 4:2:0

RGBA path written into a Vec, component ids 1 to 3, an RGBA load in the AVX2

colour conversion, and the 16-bit pass-2 rounding constant of the AVX2 forward

DCT (the original adds a 32-bit constant, which rounds only half the lanes).

Its MIT notice:

Copyright (c) 2021 Volker Ströbel

Permission is hereby granted, free of charge, to any

person obtaining a copy of this software and associated

documentation files (the "Software"), to deal in the

Software without restriction, including without

limitation the rights to use, copy, modify, merge,

publish, distribute, sublicense, and/or sell copies of

the Software, and to permit persons to whom the Software

is furnished to do so, subject to the following

conditions:

The above copyright notice and this permission notice

shall be included in all copies or substantial portions

of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF

ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED

TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A

PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT

SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY

CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION

OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR

IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER

DEALINGS IN THE SOFTWARE.

The JPEG decoder in src/jpeg/decode.rs and src/jpeg/decode/ is adapted from

zune-jpeg 0.5.15 (https://github.com/etemesi254/zune-image, crates/zune-jpeg,

commit 31d81fed7551c8ccea456d9d8e2b1fd8bebb6995), licensed MIT OR Apache-2.0

OR Zlib; the MIT terms are taken. From it: the Huffman table derivation with

its 9-bit lookahead and fast AC table, the bit reader's marker and stuffing

handling, the baseline block decode, the progressive DC and AC first and

refinement passes, the scalar integer IDCT (its port of stb_image's), the

fancy horizontal, vertical and 2x2 upsampling and the 14-bit YCbCr to RGB

conversion. Changed here: the reader works on a byte slice and refuses data

consumed past the end of the file or a marker, frames decode into whole

planes that upsample row by row, the IDCT writes bytes, the refinement pass follows libjpeg's

loop, and EXIF orientation, Adobe RGB and the CMYK and YCCK refusals are new.

Its MIT notice:

MIT License

Copyright (c) zune-image developers

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all

copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

SOFTWARE.

The forward DCT in src/jpeg/dct.rs (jpeg-encoder's port of jfdctint.c, the

slow-but-accurate integer DCT, through mozjpeg and libjpeg-turbo) and the

progressive AC refinement loop in src/jpeg/decode/bits.rs (after jdphuff.c)

are based in part on the work of the Independent JPEG Group. They carry this

notice:

This software is copyright (C) 1991-2020, Thomas G. Lane, Guido Vollbeding.

All Rights Reserved except as specified below. libjpeg-turbo Modifications:

Copyright (C) 2015, 2020, D. R. Commander.

The authors make NO WARRANTY or representation, either express or implied,

with respect to this software, its quality, accuracy, merchantability, or

fitness for a particular purpose. This software is provided "AS IS", and you,

its user, assume the entire risk as to its quality and accuracy.

Permission is hereby granted to use, copy, modify, and distribute this

software (or portions thereof) for any purpose, without fee, subject to these

conditions:

(1) If any part of the source code for this software is distributed, then this

README file must be included, with this copyright and no-warranty notice

unaltered; and any additions, deletions, or changes to the original files

must be clearly indicated in accompanying documentation.

(2) If only executable code is distributed, then the accompanying

documentation must state that "this software is based in part on the work of

the Independent JPEG Group".

(3) Permission for use of this software is granted only if the user accepts

full responsibility for any undesirable consequences; the authors accept

NO LIABILITY for damages of any kind.

These conditions apply to any software derived from or based on the IJG code,

not just to the unmodified library. If you use our work, you ought to

acknowledge us.

Permission is NOT granted for the use of any IJG author's name or company name

in advertising or publicity relating to this software or products derived from

it. This software may be referred to only as "the Independent JPEG Group's

software".

We specifically permit and encourage the use of this software as the basis of

commercial products, provided that all warranty or liability claims are

assumed by the product vendor.

The changes to the IJG code here: translated to Rust, comments removed, the

block held in a 32-byte aligned array of 16-bit samples.

The AVX2 forward DCT in src/jpeg/avx2.rs is jpeg-encoder's port of

libjpeg-turbo's jfdctint-avx2.asm, under libjpeg-turbo's SIMD licence (zlib):

Copyright 2009 Pierre Ossman for Cendio AB

Copyright (C) 2009, 2016, 2018, 2020, D. R. Commander.

Based on the x86 SIMD extension for IJG JPEG library

Copyright (C) 1999-2006, MIYASAKA Masaru.

This software is provided 'as-is', without any express or implied

warranty. In no event will the authors be held liable for any damages

arising from the use of this software.

Permission is granted to anyone to use this software for any purpose,

including commercial applications, and to alter it and redistribute it

freely, subject to the following restrictions:

1. The origin of this software must not be misrepresented; you must not

claim that you wrote the original software. If you use this software

in a product, an acknowledgment in the product documentation would be

appreciated but is not required.

2. Altered source versions must be plainly marked as such, and must not be

misrepresented as being the original software.

3. This notice may not be removed or altered from any source distribution.

The alterations: translated to Rust intrinsics, comments removed, the pass-2

rounding constant held in 16-bit lanes as the assembly has it.

The AV1 decode structures in src/gpu/vaapi/av1.rs are transcribed from libva's

va_dec_av1.h (libva 2.23, https://github.com/intel/libva), Copyright (c) 2019

Intel Corporation, under the same MIT terms as the libva notice above.

The AV1 syntax parser in src/av1/ (OBU reader, sequence and frame headers with

reference frame state, order hints, segmentation, loop filter, quantizer, delta,

CDEF, loop restoration, global motion and film grain parameters, tile info and

tile groups, and the subexp, uvlc and leb128 helpers) and the VA-API AV1

picture and tile parameter fill in src/gpu/vaapi/av1.rs are adapted from

cros-codecs (https://github.com/chromeos/cros-codecs, commit

5ff6d693ffae0b36935b8fc13092c733b4c2646f: src/codec/av1/parser.rs, reader.rs,

helpers.rs, src/decoder/stateless/av1.rs and av1/vaapi.rs). Changed: the bit

reader is src/syntax/bits.rs, Annex B input and the encoder side are left out,

indexing driven by the bitstream is checked, and film grain output, show

existing frames and the surface handling are reworked for this package's

VA-API session. It carries this notice:

Copyright 2022 The ChromiumOS Authors

Redistribution and use in source and binary forms, with or without modification,

are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this

list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice,

this list of conditions and the following disclaimer in the documentation

and/or other materials provided with the distribution.

3. Neither the name of the copyright holder nor the names of its contributors

may be used to endorse or promote products derived from this software without

specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND

ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR

ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON

ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

The SHA-256 in src/bin/pcod/sha256.rs is adapted from the sha2 crate 0.10.9

(https://github.com/RustCrypto/hashes, commit

82c36a428f8d6f05f3bfccdedb243e9d1f85359d) by the RustCrypto Developers,

dual-licensed MIT OR Apache-2.0; the MIT terms are taken here. From sha2: the

portable compression function with its four-lane message schedule, the x86-64

SHA-NI and AArch64 SHA2 compression functions and the round constants. The

streaming buffer, the padding and the runtime dispatch are new. It carries

this notice:

Copyright (c) 2006-2009 Graydon Hoare

Copyright (c) 2009-2013 Mozilla Foundation

Copyright (c) 2016 Artyom Pavlov

Permission is hereby granted, free of charge, to any

person obtaining a copy of this software and associated

documentation files (the "Software"), to deal in the

Software without restriction, including without

limitation the rights to use, copy, modify, merge,

publish, distribute, sublicense, and/or sell copies of

the Software, and to permit persons to whom the Software

is furnished to do so, subject to the following

conditions:

The above copyright notice and this permission notice

shall be included in all copies or substantial portions

of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF

ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED

TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A

PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT

SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY

CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION

OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR

IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER

DEALINGS IN THE SOFTWARE.

The progress line, the probe and manifest JSON shapes in src/bin/pcod/ are

adapted from pconv 1.0.1 (commit 8879614), MIT, by Cătălin Ilinca, the author

of pito-codecs.

The linear-light resize in src/filter/linear.rs follows zimg

(https://github.com/sekrit-twc/zimg, commit

67e0603271c080e22c8429856dd4a8a56587e61e) by sekrit-twc: the resampling filter

construction (pixel-centre positions, half-up rounding, mirrored edges, f32

coefficient error diffusion), the Lanczos weights and the BT.1886, BT.709 and

sRGB transfer functions with their constants. zimg is licensed under the Do What

The F*ck You Want To Public License, version 2 (Sam Hocevar, 2004), whose only

term is: "0. You just DO WHAT THE FUCK YOU WANT TO."; it is credited here.

The interleaved RGBA f32 convolution layout in src/filter/linear.rs (taps taken

in pairs across one 256-bit register, rows convolved over flat components) is

adapted from fast_image_resize 6.1.0

(https://github.com/Cykooz/fast_image_resize, commit

ce36aeb20ed4a33805baa3c0ff4caff7cf163e19), licensed MIT OR Apache-2.0; the MIT

terms are taken here:

MIT License

Copyright (c) 2021 Kirill Kuzminykh

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all

copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

SOFTWARE.

The PITO MD wordmark in assets/marks/pitomd-wordmark.svg is copied by bin/marks

from the PITO MD brand masters at aa3aee8b232a1b848995bf3d9a012a01d4aff8ec

(exports/pitomd/readme/wordmark.svg). The PITO MD name and its logos are

© Catalin Ilinca, all rights reserved and not covered by the MIT licence

(TRADEMARKS.md).

The VP9 alpha layout in src/mkv/writer.rs and src/mkv/reader.rs (a BlockGroup

with BlockAdditions, BlockMore, BlockAddID 1 and BlockAdditional, written in

libwebm's element order, and AlphaMode and MaxBlockAdditionID on the track)

follows libwebm (libwebm-1.0.0.32,

https://chromium.googlesource.com/webm/libwebm), which carries this notice:

Copyright (c) 2010, Google Inc. All rights reserved.

Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions are

met:

* Redistributions of source code must retain the above copyright

notice, this list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright

notice, this list of conditions and the following disclaimer in

the documentation and/or other materials provided with the

distribution.

* Neither the name of Google nor the names of its contributors may

be used to endorse or promote products derived from this software

without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR

A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT

HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT

LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,

DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Parts of this package are adapted from rav1d

(https://github.com/memorysafety/rav1d, commit 0c851fa046d6a36430570459283e5886fbdd8a66),

the Rust port of dav1d, used under the BSD-2-Clause License. Adapted module:

src/av1/cpu/ (the AV1 decoder: OBU parsing, entropy decoding, reconstruction,

loop filter, CDEF, loop restoration, film grain and frame and tile threading;

the assembly dispatch, C API and logging are dropped, the crate dependencies

are replaced by std code, and the frame front in src/av1/cpu/decoder.rs is new):

Copyright © 2018-2019, VideoLAN and dav1d authors

Copyright © 2023-2024, VideoLAN, dav1d authors, and Internet Security Research Group

All rights reserved.

Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this

list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright notice,

this list of conditions and the following disclaimer in the documentation

and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND

ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR

ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

The Vorbis bit reader, Huffman codebook decode and header parsing in

src/vorbis/ are adapted from lewton (https://github.com/RustAudio/lewton,

commit bb2955b717094b40260902cf2f8dd9c5ea62a84a, 29 commits after 0.10.2),

dual-licensed MIT OR Apache-2.0; the MIT terms are taken here. From lewton:

the module layout (bitpacking, huffman_tree, header, header_cached), the

codebook tree with its 8-bit lookup table, the identification, comment and

setup header readers with their types and checks, the VQ lookup tables, the

float32 unpacking, and the window, twiddle, bit-reverse and bark-map tables

derived from the headers, with their unit test vectors; and the audio packet

decode (floor 0 and floor 1 curves, residues 0, 1 and 2, inverse coupling, the

fast inverse MDCT translated from stb_vorbis, windowing and overlap-add) with

its neighbour and render-point test values. Changed in this package: the bit

reader reads through a 128-bit window instead of per-width

macros, residue books read all eight cascade stages (lewton reads seven), the

floor 0 book list refuses an index equal to the codebook count, the lookup

table fills every slot of a short code, empty codebooks and out-of-range

indices return errors instead of panicking, the comment header checks lengths

before allocating, a setup header may ask for at most 2^20 codebook entries

and 2^22 VQ lookup values in all (more is refused before allocating), the

header types drop the floor 0 rate and bark map size and the mapping submap

count once checked (the decode never reads them), errors are the package's

own, the identification header reads one framing bit as libvorbis does, the

first audio packet returns the part of its block past the centre that no

overlap needs (lewton drops it), the audio decode returns errors where lewton

panics (missing neighbours, mismatched windows, codebooks

without a value mapping), floor 1 values are clamped to their range as they