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aubio.h
Go to the documentation of this file.
/*
Copyright (C) 2003-2015 Paul Brossier <piem@aubio.org>
This file is part of aubio.
aubio is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
aubio is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with aubio. If not, see <http://www.gnu.org/licenses/>.
*/
/** \mainpage
\section introduction Introduction
aubio is a library to extract annotations from audio signals: it provides a
set of functions that take an input audio signal, and output pitch estimates,
attack times (onset), beat location estimates, and other annotation tasks.
\section basics Basics
All object structures in aubio share the same function prefixes and suffixes:
- \p new_aubio_foo creates the object \p foo
- \p aubio_foo_do executes the object \p foo
- \p del_aubio_foo destroys the object \p foo
All memory allocation and deallocation take place in the \p new_ and \p del_
functions. Optionally, more than one \p _do methods are available.
Additional parameters can be adjusted and observed using:
- \p aubio_foo_get_param, getter function, gets the value of a parameter
- \p aubio_foo_set_param, setter function, changes the value of a parameter
Unless specified in its documentation, no memory operations take place in the
getter functions. However, memory resizing can take place in setter
functions.
\subsection vectors Vectors
Two basic structures are being used in aubio: ::fvec_t and ::cvec_t. The
::fvec_t structures are used to store vectors of floating pointer number.
::cvec_t are used to store complex number, as two vectors of norm and phase
elements.
Additionally, the ::lvec_t structure can be used to store floating point
numbers in double precision. They are mostly used to store filter
coefficients, to avoid instability.
\subsection objects Available objects
Here is a list of some of the most common objects for aubio:
\code
// fast Fourier transform (FFT)
aubio_fft_t *fft = new_aubio_fft (winsize);
// phase vocoder
aubio_pvoc_t *pv = new_aubio_pvoc (winsize, stepsize);
// onset detection
aubio_onset_t *onset = new_aubio_onset (method, winsize, stepsize, samplerate);
// pitch detection
aubio_pitch_t *pitch = new_aubio_pitch (method, winsize, stepsize, samplerate);
// beat tracking
aubio_tempo_t *tempo = new_aubio_tempo (method, winsize, stepsize, samplerate);
\endcode
See the <a href="globals_type.html">list of typedefs</a> for a complete list.
\subsection example Example
Here is a simple example that creates an A-Weighting filter and applies it to a
vector.
\code
// set window size, and sampling rate
uint_t winsize = 1024, sr = 44100;
// create a vector
fvec_t *this_buffer = new_fvec (winsize);
// create the a-weighting filter
aubio_filter_t *this_filter = new_aubio_filter_a_weighting (sr);
while (running) {
// here some code to put some data in this_buffer
// ...
// apply the filter, in place
aubio_filter_do (this_filter, this_buffer);
// here some code to get some data from this_buffer
// ...
}
// and free the structures
del_aubio_filter (this_filter);
del_fvec (this_buffer);
\endcode
Several examples of C programs are available in the \p examples/ and \p tests/src
directories of the source tree.
Some examples:
- @ref spectral/test-fft.c
- @ref spectral/test-phasevoc.c
- @ref onset/test-onset.c
- @ref pitch/test-pitch.c
- @ref tempo/test-tempo.c
- @ref test-fvec.c
- @ref test-cvec.c
\subsection unstable_api Unstable API
Several more functions are available and used within aubio, but not
documented here, either because they are not considered useful to the user,
or because they may need to be changed in the future. However, they can still
be used by defining AUBIO_UNSTABLE to 1 before including the aubio header:
\code
#define AUBIO_UNSTABLE 1
#include <aubio/aubio.h>
\endcode
Future versions of aubio could break API compatibility with these functions
without warning. If you choose to use functions in AUBIO_UNSTABLE, you are on
your own.
\section download Download
Latest versions, further documentation, examples, wiki, and mailing lists can
be found at https://aubio.org .
*/
#ifndef AUBIO_H
#define AUBIO_H
/** @file aubio.h Global aubio include file.
You will want to include this file as:
@code
#include <aubio/aubio.h>
@endcode
To access headers with unstable prototypes, use:
@code
#define AUBIO_UNSTABLE 1
#include <aubio/aubio.h>
@endcode
*/
#ifdef __cplusplus
extern "C"
{
#endif
/* in this order */
#include "types.h"
#include "fvec.h"
#include "cvec.h"
#include "lvec.h"
#include "fmat.h"
#include "musicutils.h"
#include "vecutils.h"
#include "temporal/resampler.h"
#include "temporal/filter.h"
#include "temporal/biquad.h"
#include "temporal/a_weighting.h"
#include "temporal/c_weighting.h"
#include "spectral/fft.h"
#include "spectral/dct.h"
#include "spectral/phasevoc.h"
#include "spectral/filterbank.h"
#include "spectral/filterbank_mel.h"
#include "spectral/mfcc.h"
#include "spectral/specdesc.h"
#include "spectral/awhitening.h"
#include "spectral/tss.h"
#include "pitch/pitch.h"
#include "onset/onset.h"
#include "tempo/tempo.h"
#include "notes/notes.h"
#include "io/source.h"
#include "io/sink.h"
#include "synth/sampler.h"
#include "synth/wavetable.h"
#include "utils/parameter.h"
#include "utils/log.h"
#if AUBIO_UNSTABLE
#include "mathutils.h"
#include "io/source_sndfile.h"
#include "io/source_apple_audio.h"
#include "io/source_avcodec.h"
#include "io/source_wavread.h"
#include "io/sink_sndfile.h"
#include "io/sink_apple_audio.h"
#include "io/sink_wavwrite.h"
#include "io/audio_unit.h"
#include "onset/peakpicker.h"
#include "pitch/pitchmcomb.h"
#include "pitch/pitchyin.h"
#include "pitch/pitchyinfft.h"
#include "pitch/pitchyinfast.h"
#include "pitch/pitchschmitt.h"
#include "pitch/pitchfcomb.h"
#include "pitch/pitchspecacf.h"
#include "tempo/beattracking.h"
#include "utils/scale.h"
#include "utils/hist.h"
#endif
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif
a_weighting.h
A-weighting filter coefficients.
awhitening.h
Spectral adaptive whitening.
biquad.h
Second order Infinite Impulse Response filter.
c_weighting.h
C-weighting filter coefficients.
cvec.h
Vector of complex-valued data, stored in polar coordinates.
dct.h
Discrete Cosine Transform.
fft.h
Fast Fourier Transform.
filter.h
Digital filter.
filterbank.h
Filterbank object.
filterbank_mel.h
Filterbank object coefficients initialization.
fmat.h
Matrix of real valued data.
fvec.h
Vector of real-valued data.
log.h
Logging features.
lvec.h
Vector of real-valued data in double precision.
mfcc.h
Mel-Frequency Cepstrum Coefficients object.
musicutils.h
various functions useful in audio signal processing
notes.h
Note detection object.
onset.h
Onset detection object.
parameter.h
Parameter with linear interpolation.
phasevoc.h
Phase vocoder object.
pitch.h
Pitch detection object.
resampler.h
Resampling object.
sampler.h
Load and play sound files.
sink.h
Media sink to write blocks of consecutive audio samples to file.
source.h
Media source to read blocks of consecutive audio samples from file.
specdesc.h
Spectral description functions.
tempo.h
Tempo detection object.
tss.h
Transient / Steady-state Separation (TSS).
types.h
Definition of data types used in aubio.
vecutils.h
Utility functions for fvec_t.
wavetable.h
Wavetable synthesis.