NI MEDIA 
NI Media is a library for reading from / writing to audio streams developed at Native Instruments.
Motivation
The goal is to have a modern C++ library for dealing with audio streams in an idiomatic C++ style.
Modern:
- a clear separation of concerns (modular instead of fat classes)
- support for ranges and iterators
Idiomatic:
- based on std.streams.
- integrates well with STL algorithms and boost
The following example demonstrates how to stream an entire audio file into a vector:
#include <ni/media/audio/ifstream.h>
#include <vector>
int main()
{
auto stream = audio::ifstream("hello.wav");
auto samples = std::vector<float>(stream.info().num_samples());
stream >> samples;
// use samples
}Components
- audiostream: the main library for reading from / writing to audio streams.
- pcm: a small library to convert pcm data from / to arithmetic types.
Dependencies
- boost ( algorithm, endian, filesystem, format, icl, iostream, local, program-option, regex, system)
- flac & ogg, for flac support (CMake option
NIMEDIA_ENABLE_FLAC_DECODING) - vorbis & ogg, for ogg vorbis support (CMake option
NIMEDIA_ENABLE_OGG_DECODING) - googletest for building the tests (CMake option
NIMEDIA_TESTS)
Platforms
ni-media requires a c++14 compliant compiler and is currently supported and tested on these platforms:
- Windows ( requires Visual Studio 2015 Update 3 or higher )
- Mac OS X ( requires Xcode / Clang 7.3 or higher )
- iOS ( requires Xcode / Clang 7.3 or higher )
- Linux ( requires GCC 5.0 or higher, Clang 7.3 or higher should also work )
Building
First, build and install boost filesystem, iostream, system and program-option to path/to/dependencies. Optionally install any codecs that you want to use, for example flac and ogg-vorbis.
Now configure ni-media with CMake (version 3.12.4 or higher is required)
cmake -G YOUR-PROJECT-GENERATOR -DCMAKE_PREFIX_PATH=path/to/dependencies/ path/to/ni-media
Specific codecs can be enabled / disabled by passing additional CMake options.
We can now build ni-media:
cmake --build .
Testing
googletest is required for testing and needs to be installed to path/to/dependencies. The unit tests can be enabled with CMake option NIMEDIA_TESTS.
cmake -G YOUR-PROJECT-GENERATOR -DCMAKE_PREFIX_PATH=path/to/dependencies/ -DNIMEDIA_TESTS=ON path/to/ni-media
Before running the tests some reference test files need to be downloaded using git-lfs:
git lfs pull -X ""
To execute the tests run:
cmake --build . --target test
Contributions
We very much appreciate your contribution! If you want to contribute please get in touch with the maintainers:
Please run clang-format with the provided .clang-format file and if possible add some tests when opening a pull request.