Csound

a less irritating audio programming language

Cabbage Studio for Csound is an alarmingly modern experience for people used to the classic Supercollider UI, whose characteristic widget is ERROR: Message 'foo' not understood. RECEIVER: nil. (sic)

Cabbage Studio for Csound is an alarmingly modern experience for people used to the classic Supercollider UI, whose characteristic widget is ERROR: Message 'foo' not understood. RECEIVER: nil. (sic)

Source: Cabbage audio.

Csound is an audio coding language. It is Supercollider’s uncle by marriage. Actively developed. Eccentric. Permissive licensing. Smallish. Clean API. Thus, it works beautifully with other languages, which is unusual.

Learning resources

There are various books:

Interoperation

c

Check out this minimal invocation of the csound api.

#include "csound.h"

int main(int argc, char **argv)
{
  // Create Csound.
  void *csound = csoundCreate(0);
  // One complete compile/perform cycle.
  int result = csoundCompile(csound, argc, argv);
  if(!result) {
  while(csoundPerformKsmps(csound) == 0){}
  csoundCleanup(csound);
  }
  // Destroy Csound.
  csoundDestroy(csound);
  return result;
}

You’ll need this API capability, because its interactive capabilities are, AFAICT, minimalist; a decent external sequencer is necessary for live work.

Csound committer Michael Gogins has put it to me that javascript is natural for this niche, and indeed, he has written a lot of code to this end.

Examples of various Foreign Function Interface invocations (lua, python, go) are in the manual. There is a repository of such examples, in fact.

python

There are a few confusing options and you have to track the release notes to grok the difference.

I recommend you ignore most of them.

Ctcsound

Use ctcsound, which is newer, based on ctypes, and runs in python 3. It is clean and easy. Note you may need to compile the latest version of csound to use it. It includes a port of icsound, which makes things easy.

csnd

The older interfaces are placed by the csound installer in an idiosyncratic fashion into the system python 2 packages folder, which is asking for trouble and I don’t recommend it.

csnd6, is one such older API, based on SWIG. There is a detailed example in the csound journal.

  • icsound seems to be a higher-level wrapper of csnd6, removing much boring boilerplate such as explicit thread management.

CsoundAC

CsoundAC embeds csound in python, with much extra C++ wrapper code.

import CsoundAC
csound.load("c:/projects/csound5/examples/trapped.csd")
csound.exportForPerformance()
csound.perform()

It’s not clear to me yet how good this is for live control.

Inceptpython

Moreover, python is, in turn, embedded in csound. Fractal infinite recursion left as an exercise.

Miscellaneous

  • embeds lua as opcodes
  • embeds faust as opcodes in csound.
  • embeds fluidsynth for soundfont playback
  • Includes a VST generator and IDE, cabbage:

    Cabbage is a Csound frontend that provides users with the means to develop audio plugins and standalone software across the three major operating systems. While Cabbage makes use of underlying plugin technologies such as Steinberg’s VST SDK, ASIO, etc, Csound is used to process all incoming and outgoing audio. Cabbage also provides a growing collection of GUI widgets ranging from simple sliders to automatable XY-pads. All GUI widgets in a Cabbage plugin can be controlled via host automation in a plugin host, thereby providing a quick and effective means of automating Csound instrument parameters in both commercial and non-commercial DAWs.

  • Csound-as-VST is a thing, but VST honchos Steinberg hate fun, so it’s a pain in the arse

  • includes a C-compiled Chrome browser version via PNaCl or webassembly or whatever Google have switched us all to this week.

  • or you can link it to other things using its API; See the examples.

Csound producs

VST audio plugins

Hadron is an open-source csound VST that’s pretty sweet.

IDEs and frontends

There are many frontends.

In addition to Cabbage, mentioned above,

  • blue is a DAW for Csound:

    A cross-platform composition-oriented front end written by Steven Yi in Java. The user interface provides a timeline structured somewhat like a digital multitrack, but differs in that timelines can be embedded within timelines (polyObjects). This allows for a compositional organization in time that many users will find intuitive, informative, and flexible. Each instrument and score section in a blue project has its own editing window, which makes organizing large projects easier. Blue can be downloaded at Blue Home Page.

  • runloopsound is the iOS Csound and reputedly includes an editor/IDE? should check. I thought that violated the App Store guidelines.
  • csoundqt is the default IDE:

    CsoundQt is a versatile, cross-platform GUI (graphical user interface) which is bundled with the standard Csound distribution. Created and maintained by Andres Cabrera, QuteCsound provides a multi-tabbed editor, graphic widgets for real-time sound control, and an opcode help system that links to this manual.

Linkdump

Things I am currently reading: