Pycodec2

Pycodec2 is a Cython wrapper for Codec 2.

In other words, Pycodec2 allows using the Codec 2 C library from Python.

Installation

Prerequisites

Pycodec2 requires Codec 2.

On Linux, I recommend using the distro's package-manager, e.g., on Arch/Manjaro: pacman -Syuu codec2, so that Codec2's assets land in standard searchable directories for python setup.py to use.

On macOS, you may use the Homebrew formula.

Instructions

You can install the library using PyPI (the easiest option) or from source.

From PyPI

To install the library from PyPI, run:

pip install pycodec2

From Source

To install the library from source, see building instructions in DEV.md. You can then install the wheel with:

pip install dist/*.whl

Codec 2 Compatibility

Pycodec2 3.* is compatible with Codec 2 1.2.*.

Pycodec2 2.* is compatible with Codec 2 1.0.*.

Pycodec2 1.0.* is compatible with Codec 2 at 0.9.2+ versions.

If your Codec 2 version is older than 0.9.2, then try pycodec2-old package.

For more information on potential compatibility problems, check out this issue.

Usage

Example

example.py implements a basic script that uses Codec 2 to encode and deencode a sample. Use the following steps to run an end-2-end scenario (dev/rune2etest implements steps 2-5).

1. Download a sample .wav file, e.g., trashcan.

2. Convert the .wav to a raw mono-channel 8kHz format, e.g.,

   sox trashcan.wav -e signed-integer -b 16 trashcan.raw channels 1 rate 8000

3. Compile pycodec2

   python setup.py build_ext --inplace

4. Run example.py

   python example.py trashcan.raw

5. Convert output.raw

   sox -r 8000 -e signed-integer -b 16 output.raw output.wav

Now you can listen to output.wav.

Expected Input Format

Codec 2 assumes that input files use:

• 8kHz bitrate,
• 16-bit width samples,
• a single channel.

Available Modes

For a list of currently supported modes, look for _modes in pycodec2/pycodec2.pyx.

Remarks

This library is considered complete. Please notify me or send a pull request on GitHub if you notice any bugs.