opuscodec

Python bindings and self-contained Opus CLI builds, with QEXT enabled by default.

opuscodec packages three things together:

• OpusBufferedEncoder / OpusBufferedDecoder Python bindings
• self-contained opusenc / opusdec release binaries
• vendored Xiph dependencies, built from source when needed

Stable dependency set:

• opus 1.6.1
• opus-tools 0.2
• libogg 1.3.6
• opusfile 0.12
• libopusenc 0.3

Why this package

• no system Opus install required by default
• runtime + build-time QEXT control
• Python API and CLI assets released from one repo
• PyPI wheels for supported targets, source build fallback everywhere else

Installation

PyPI (recommended)

python -m pip install opuscodec==0.1.2

GitHub Release asset

python -m pip install "https://github.com/fishaudio/opuscodec/releases/download/v0.1.2/<wheel-file-name>.whl"

Example Linux wheel name:

python -m pip install ./opuscodec-0.1.2-cp312-cp312-manylinux_2_28_x86_64.whl

Source build

make test

Common commands:

make install    # editable install + test deps
make test       # run pytest
make wheel      # build wheel into dist/wheels
make binaries   # build opusenc/opusdec into dist/bin
make clean      # clean build artifacts

Python example

import numpy as np
import opuscodec

sr = 48000
x = (0.1 * np.sin(2 * np.pi * 440 * np.arange(sr) / sr) * 32767).astype(np.int16).reshape(-1, 1)

enc = opuscodec.OpusBufferedEncoder(sample_rate=sr, channels=1)
packet = enc.write(x) + enc.flush()

dec = opuscodec.OpusBufferedDecoder()
y = dec.decode(packet)

print(y.shape, opuscodec.opus_version(), opuscodec.qext_enabled(), enc.qext_enabled())

Disable runtime QEXT for one encoder instance:

enc = opuscodec.OpusBufferedEncoder(sample_rate=48000, channels=1, qext=False)

Standalone binary usage

After downloading release binaries:

tar -xzf opuscodec-v0.1.2-linux-amd64-binaries.tar.gz
chmod +x opusenc opusdec

WAV roundtrip

./opusenc input.wav output.opus
./opusdec output.opus roundtrip.wav

opusenc enables QEXT by default in this repository build. Disable it explicitly for comparison tests:

./opusenc --set-ctl-int 4056=0 input.wav output-noqext.opus

Raw PCM roundtrip

Encode raw PCM (mono, 48k, s16le) to Opus:

./opusenc --raw --raw-bits 16 --raw-rate 48000 --raw-chan 1 input.pcm output.opus

Decode Opus back to PCM:

./opusdec output.opus decoded.pcm

Build configuration

Defaults: vendored dependencies; QEXT enabled.

Optional environment variables:

• OPUSCODEC_ENABLE_QEXT=0 — disable QEXT
• OPUSCODEC_USE_SYSTEM_DEPS=1 — use system libraries instead of vendored build
• OPUSCODEC_DEPS_PREFIX=/path/to/prefix — custom dependency prefix

When QEXT is enabled at build time, packaged opusenc binaries also enable OPUS_SET_QEXT(1) by default.

Repository layout

.
├── .github/workflows/build.yml
├── Makefile
├── pyproject.toml
├── setup.py
├── src/
│   └── opuscodec_bindings.cpp
├── scripts/
│   ├── build_deps.sh
│   └── build_binaries.sh
├── tests/
│   └── test_bindings.py
├── opusenc.py
└── opusdec.py

Release automation

On tag push (for example v0.1.2), GitHub Actions will:

• run tests on Linux + macOS
• build PyPI-compatible manylinux wheels for Linux
• build macOS arm64 wheels
• build an sdist
• publish wheel + sdist artifacts to PyPI via OIDC
• create a GitHub Release and upload wheels + binary tarballs

License

Apache License 2.0. See LICENSE.