ref: 7166ef8f3c2c07ea2fe4a6b6b540aac96509e56d
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aubio documentation
===================
aubio is a collection of algorithms and tools to label music and sounds. It
listens to audio signals and attempts to detect events. For instance, when a
drum is hit, at which frequency is a note, or at what tempo is a rhythmic
melody.
Its features include segmenting a sound file before each of its attacks,
performing pitch detection, tapping the beat and producing midi streams from
live audio.
aubio provide several algorithms and routines, including:
- several onset detection methods
- different pitch detection methods
- tempo tracking and beat detection
- MFCC (mel-frequency cepstrum coefficients)
- FFT and phase vocoder
- up/down-sampling
- digital filters (low pass, high pass, and more)
- spectral filtering
- transient/steady-state separation
- sound file and audio devices read and write access
- various mathematics utilities for music applications
The name aubio comes from *audio* with a typo: some errors are likely to be
found in the results.
Python module
-------------
A python module to access the library functions is also provided. Please see
the file ``python/README`` for more information on how to use it.
Examples tools
--------------
A few simple command line tools are included along with the library:
- ``aubioonset`` outputs the time stamp of detected note onsets
- ``aubiopitch`` attempts to identify a fundamental frequency, or pitch, for
each frame of the input sound
- ``aubiomfcc`` computes Mel-frequency Cepstrum Coefficients
- ``aubiotrack`` outputs the time stamp of detected beats
- ``aubionotes`` emits midi-like notes, with an onset, a pitch, and a duration
- ``aubioquiet`` extracts quiet and loud regions
Additionally, the python module comes with the following script:
- ``aubiocut`` slices sound files at onset or beat timestamps
C API basics
------------
The library is written in C and is optimised for speed and portability.
The C API is designed in the following way:
.. code-block:: c
aubio_something_t * new_aubio_something(void * args);
audio_something_do(aubio_something_t * t, void * args);
smpl_t aubio_something_get_a_parameter(aubio_something_t * t);
uint_t aubio_something_set_a_parameter(aubio_something_t * t, smpl_t a_parameter);
void del_aubio_something(aubio_something_t * t);
For performance and real-time operation, no memory allocation or freeing take
place in the ``_do`` methods. Instead, memory allocation should always take place
in the ``new_`` methods, whereas free operations are done in the ``del_`` methods.
.. code-block:: bash
./waf configure
./waf build
sudo ./waf install
aubio compiles on Linux, Mac OS X, Cygwin, and iPhone.
Documentation
-------------
- Manual pages: http://aubio.org/documentation
- API documentation: http://aubio.org/doc/latest/
Contribute
----------
- Issue Tracker: https://github.com/piem/aubio/issues
- Source Code: https://github.com/piem/aubio
Contact info
------------
The home page of this project can be found at: http://aubio.org/
Questions, comments, suggestions, and contributions are welcome. Use the
mailing list: <aubio-user@aubio.org>.
To subscribe to the list, use the mailman form:
http://lists.aubio.org/listinfo/aubio-user/
Alternatively, feel free to contact directly the author.
Contents
--------
.. toctree::
:maxdepth: 1
installing
python_module