Kirika

Collection of audio utilities for decoding/encoding files and streams.

• Not based on ffmpeg/libav/libavcodec/libavformat and alike
• Channel-based audio consumption/filter chain
• Raw sample analyzer channels
• AnalyzerChannel channels / mergers / splitters / trimmers
• Audio resampler
• Audio downmixing to stereo/mono
• Multi-codec decoder and encoder
• Multi-format packetizers
• ReplayGain 2.0 track/album calculator

Codecs supported

Codec	Containers	Decoder	Analyzer	Encoder	Notes
FLAC	FLAC, Ogg	✅	✅	✅	Adjustable encoding compression level and block size. Decoding/encoding by libFLAC via goflac.
TTA	TTA	✅	✅	✅	Decoding/encoding via go-tta.
MP3	MP3	✅	-	✅	Adjustable encoding bitrate and mode. Decoding via minimp3, encoding by LAME via go-lame.
Opus	Ogg	✅	-	✅	Adjustable encoding bitrate. Decoding/encoding by libopus via go-pus.
Vorbis	Ogg	✅	-	❌	Decoding by jfreymuth/vorbis via jfreymuth/oggvorbis.
AAC	ADTS	✅	-	✅	Adjustable encoding bitrate and mode (LC, HEv2). Decoding/encoding by FDK-AAC via go-fdkaac.

Container packetizers supported

Container	Packetizer	Keep Mode	Sample Numbers	Notes
FLAC	✅	✅	✅	Uses mewkiz/flac for parsing streams.
TTA	❌	-	-
MP3	✅	✅	✅	Uses sssgun/mp3 as a frame parser.
Ogg	✅	✅	✅*	*Sample numbers (absolute granule position in Ogg) depend on underlying codec implementing it. Has been tested as working for Opus
ADTS	✅	✅	✅	Uses edgeware/mp4ff for its ADTS frame parser.

Dependencies

Go >= 1.18

libFLAC (required by goflac)

sudo apt install libflac-dev

libopus and libopusfile (required by go-pus)

sudo apt install libopus-dev libopusfile-dev

libopusenc (required by go-pus)

git clone --depth 1 https://github.com/xiph/libopusenc.git
cd libopusenc
./autogen.sh
./configure --prefix /usr
make
sudo make install

FDK AAC Codec Library (required by go-fdkaac)

git clone --depth 1 https://github.com/mstorsjo/fdk-aac.git
cd fdk-aac
./autogen.sh
./configure --prefix /usr
make -j$(nproc)
sudo make install

LAME (required by go-lame)

sudo apt install libmp3lame-dev

libsamplerate (required by gosamplerate)

sudo apt install libsamplerate0-dev

libebur128 (required by go-ebur128)

sudo apt install libebur128-dev

Licenses

Kirika

Copyright (c) 2022 Kirika Contributors 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 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.

Dependencies

Subdependencies that are not cgo-based are denoted in cursive.

Dependency	License	Notes
S.O.N.G/go-ebur128	BSD 2-Clause
jiixyj/libebur128	MIT	Can be linked by cgo as a shared library.
S.O.N.G/go-fdkaac	MIT
mstorsjo/fdk-aac	FDK License, BSD-like	Does not include patent grants. Can be linked by cgo as a shared library.
S.O.N.G/go-pus	MIT
xiph/opus	BSD 3-Clause	Read extra license details on the official site. Can be linked by cgo as a shared library.
xiph/opusfile	BSD 3-Clause	Can be linked by cgo as a shared library.
xiph/ogg	BSD 3-Clause	Can be linked by cgo as a shared library.
xiph/libopusenc	BSD 3-Clause	Can be linked by cgo as a shared library.
S.O.N.G/go-tta	LGPL v3
S.O.N.G/goflac	BSD 3-Clause
xiph/flac	BSD 3-Clause	Read extra license details on the official site. Can be linked by cgo as a shared library.
dh1tw/gosamplerate	BSD 2-Clause
libsndfile/libsamplerate	BSD 2-Clause	Can be linked by cgo as a shared library.
edgeware/mp4ff	MIT
jfreymuth/oggvorbis	MIT
jfreymuth/vorbis	MIT	Subdependency of jfreymuth/oggvorbis.
kvark128/minimp3	MIT
lieff/minimp3	CC0 1.0
mewkiz/flac	The Unlicense
go-audio/audio	Apache 2.0	Subdependency of mewkiz/flac. Only used on tests there.
go-audio/wav	Apache 2.0	Subdependency of mewkiz/flac. Only used on tests there.
go-audio/riff	Apache 2.0	Subdependency of go-audio/wav. Only used on tests there.
icza/bitio	Apache 2.0 or LGPL v2.1	Subdependency of mewkiz/flac.
sssgun/mp3	MIT
viert/go-lame	MIT
LAME	LGPL v2	Can be linked by cgo as a shared library.