FAUST (programming language): Difference between revisions

Revision as of 11:46, 17 July 2025

Latest revision as of 13:02, 17 July 2025

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| operating system = [[Linux]], [[OS X]], [[Microsoft Windows|Windows]], [[Unix]]

| genre = Functional programming language for audio signal processing

| repo = {{URL|https://github.com/grame-cncm/faust/}}

| programming language = [[C++]]

| license = [[GNU General Public License|GPL]]

| website = {{URL|faust.grame.fr}}

}}

{{Portal|Free and open-source software}}

'''FAUST''' (Functional AUdio STream) is a [[___domain-specific language|___domain-specific]] [[purely functional programming|purely functional]] [[programming language]] for implementing [[signal processing]] [[algorithms]] in the form of [[Library (computing)|libraries]], [[audio plug-ins]], or standalone applications. A FAUST program denotes a signal processor: a mathematical function that is applied to some input signal and then fed out.

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==Example code==

FAUST programs define a <code>process</code> function that operates on incoming data. This is analogous to the <code>main</code> function in most programming languages. The following is an example that produces silence:

<syntaxhighlight lang="haskell">

process = 0;

</syntaxhighlight>

The second example copies the input signal to the output. It involves the <code>_</code> primitive that denotes the [[identity function]] for signals:

<syntaxhighlight lang="haskell">

process = _;

</syntaxhighlight>

Another example sums a stereo signal into a mono signal using the <code>+</code> primitive:

<syntaxhighlight lang="haskell">

process = +;

</syntaxhighlight>

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Using the sequential composition operator <code>:</code> the output of <code>+</code> can be routed to the input of <code>abs</code> to compute the [[absolute value]] of the signal:

<syntaxhighlight lang="haskell">

process = + : abs;

</syntaxhighlight>

Here is an example of parallel composition using the <code>,</code> operator that arranges its left and right expressions in parallel. This is analogous to a stereo cable.

<syntaxhighlight lang="haskell">

process = _,_;

</syntaxhighlight>

These operators can be combined arbitrarily. The following code multiplies an input signal with 0.5:

<syntaxhighlight lang="haskell">

process = _,0.5 : *;

</syntaxhighlight>

The above may be rewritten in [[currying|curried]] form:

<syntaxhighlight lang="haskell">

process = *(0.5);

</syntaxhighlight>

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{| class="wikitable"

|+ Some architecture files available for FAUST

! File

| alsa-gtk.cpp || ALSA application + GTK

! Architecture

|-

| alsa-gtk.cpp || ALSA application + [[GTK]]

|-

| alsa-qt.cpp || ALSA application + QT4[[Qt (software)|Qt]] 4

|-

| android.cpp || Android applications

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| au.cpp || Audio Unit plug-in

|-

| ca-qt.cpp || CoreAudio application + QT4Qt 4

|-

| ios-coreaudio.cpp || iPhone and iPad applications

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| jack-gtk.cpp || JACK application + GTK

|-

| jack-qt.cpp || JACK application + QT4Qt 4

|-

| ladspa.cpp || LADSPA plug-in

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| max-msp.cpp || Max MSP plug-in

|-

| pd.cpp || PuredataPure Data plug-in

|-

| q.cpp || Q language plug-in

|-

| supercollider.cpp || SupercolliderSuperCollider plug-in

|-

| vst.cpp || VST plug-in

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{{Commons category|FAUST (programming language)}}

* {{Official website|faust.grame.fr}}, online compiler, support, documentation, news, etc.

* {{GitHub|grame-cncm/faust}}

[[Category:Audio programming languages]]

[[Category:Programming languages created in 2002]]