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C library for cross-platform real-time audio input and output
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README.md

libsoundio

C library which provides cross-platform audio input and output. The API is suitable for real-time software such as digital audio workstations as well as consumer software such as music players.

This library is an abstraction; however it prioritizes performance and power over API convenience. Features that only exist in some sound backends are exposed.

This library is a work-in-progress.

How It Works

libsoundio tries these backends in order. If unable to connect to that backend, due to the backend not being installed, or the server not running, or the platform is wrong, the next backend is tried.

  1. JACK
  2. PulseAudio
  3. ALSA (Linux)
  4. CoreAudio (OSX)
  5. ASIO (Windows)
  6. DirectSound (Windows)
  7. OSS (BSD)
  8. Dummy

Contributing

libsoundio is programmed in a tiny subset of C++11:

  • No STL.
  • No new or delete.
  • No class. All fields in structs are public.
  • No exceptions or run-time type information.
  • No references.
  • No linking against libstdc++.

Don't get tricked - this is a C library, not a C++ library. We just take advantage of a select few C++11 compiler features such as templates, and then link against libc.

Building

Install the dependencies:

  • cmake
  • ALSA library (optional)
  • libjack2 (optional)
  • libpulseaudio (optional)
mkdir build
cd build
cmake ..
make
sudo make install

Building With MXE

You can build libsoundio with mxe. Follow the requirements section to install the packages necessary on your system. Then somewhere on your file system:

git clone https://github.com/mxe/mxe
cd mxe
make gcc

Then in the libsoundio source directory (replace "/path/to/mxe" with the appropriate path):

mkdir build-win
cd build-win
cmake .. -DCMAKE_TOOLCHAIN_FILE=/path/to/mxe/usr/i686-w64-mingw32.static/share/cmake/mxe-conf.cmake
make

Roadmap

  1. sine example working with dummy backend linux, osx, windows
  2. sine example working with pulseaudio backend linux
  3. pipe record to playback example working with dummy linux, osx, windows
  4. pipe record to playback example working with pulseaudio linux
  5. implement CoreAudio (OSX) backend, get examples working
  6. implement DirectSound (Windows) backend, get examples working
  7. implement ALSA (Linux) backend, get examples working
  8. implement JACK backend, get examples working
  9. Avoid calling panic in PulseAudio.
  10. implement ASIO (Windows) backend, get examples working
  11. clean up API and improve documentation
  12. use a documentation generator and host the docs somewhere
  13. -fvisibility=hidden and then explicitly export stuff
  14. Integrate into libgroove and test with Groove Basin
  15. Consider testing on FreeBSD

Planned Uses for libsoundio