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# C Speech Features
This library is a complete port of [python_speech_features](https://github.com/jameslyons/python_speech_features) to C.
Clone this repository in your C/C++ project:
` git clone https://github.com/cwiiis/c_speech_features `
and add these files to your build:
` c_speech_features.c kiss_fft130/kiss_fft.c kiss_fft130/tools/kiss_fftr.c `
Alternatively, you can build shared and static libraries to use with your project instead of importing the files directly. Using cmake, from within a check-out:
` cmake -DCMAKE_C_FLAGS="-O2" -DCMAKE_INSTALL_PREFIX="/usr/local" -DENABLE_DOUBLE=OFF make `
This will result in libc_speech_features.so and libc_speech_features_static.a being built (or platform equivalents), which you can link in your project. An install target is also provided, allowing system-wide use of the library, but this is not recommended.
Refer to [c_speech_features.h](c_speech_features.h) for documentation.
` python setup.py install `
This will build and install the statically linked c_speech_features module, which can then be used in any python script. Refer to [python/test.py](python/test.py) to see examples of its use. For the most part, it is a drop-in replacement for python_speech_features.
### Differences to python_speech_features
c_speech_features only supports one datatype, which is defined at compile-time. Currently, this can be either 32-bit (float), or 64-bit (double). python_speech_features operates in 64-bit by default.
python_speech_features.sigproc functions are located directly on the c_speech_features module.
The winfunc parameter is an array instead of a function, and is expected to be as wide as necessary depending on context.
It is not recommended to replace python_speech_features with c_speech_features in a Python context. python_speech_features is safer and will output better error messages when fed with incorrect parameters. c_speech_features is most likely to crash in such situations. On the other hand, this module can be useful to debug issues when using c_speech_features in more appropriate contexts, or if you have very specific needs. c_speech_features is likely to perform faster when compiled with optimisation than python_speech_features. In 64-bit, the gains are minimal, except for particular functions, where as in 32-bit the gains can be substantial (at the cost of precision).
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