Incudine is also the name of a standalone executable. Please consult the INSTALL file if you'd like to install it.

Here is a basic tutorial to introduce the command.

mkdir incudine_tut
cd !$

# usage
incudine -h

# Simple files for the test
cat >foo.cudo <<'---'
(dsp! simple (freq db (env envelope) gate)
  (stereo (* (envelope env gate 1 #'free)
             (sine freq (db->lin db) 0))))
---

cat >quux.rego <<'---'
with (env1 (make-adsr .1 .09 .9 .5))

0   simple  440  -14  env1  1
0   simple  220  -20  env1  1
0.5 simple  225  -26  env1  1
1   simple  448  -14  env1  1
3   simple  450  -20  (make-adsr 1 .2 .7 1 :curve :sin)  1
5   set-control 0 :gate 0
---

Note: the package is INCUDINE.SCRATCH (nickname SCRATCH) by default.

incudine foo.cudo -s quux.rego

It remembers orchestra+score in Csound, however we can use multiple files and a lisp file can contain what you want, not necessarily specific code for Incudine. A rego file (see Getting Start - Part 3) is transformed in an intermediate lisp file containing also the code to execute the score in realtime or to write a soundfile to disk.

We get a soundfile `quux.wav' and two FASL called `foo.fasl' and `quux.fasl'. If we run again the previous command line…

incudine foo.cudo -s quux.rego

… the execution is faster, because we are using the compiled files. A source file is re-compiled if:

  1. the source is modified after the compilation
  2. the command line arguments before the name of the source file are changed

There aren't options before foo.cudo, therefore it also works without re-compilation:

incudine foo quux

The sound is truncated after 5 beats; we can add some padding:

incudine foo.cudo --pad 1.2 -s quux.rego

and only quux.rego is re-compiled, because the new argument `–pad 1.2' doesn't precede foo.cudo.

Changing the name of the output file:

incudine foo.cudo -o "battimenti zincati.wav" -s quux.rego

Score from standard input:

echo '0 simple 1000 -6 (make-perc .1 1.5) 1' \
     | incudine foo.cudo -d 2 -s - > rego-from-stdin-1.wav

cat quux.rego | incudine foo.cudo -o rego-from-stdin-2.wav -s -

Redirection of the audio to the standard output:

incudine foo.cudo --pad 1.2 -o - -H ircam -F float \
         -s quux.rego | sox - quux.wv

We can also decide to use an absolute duration for the output file:

incudine foo.cudo -d 6.5 -s quux.rego

For realtime, please start Jack on Linux and set the rt priorities of Incudine. You can change them in $HOME/.incudinerc or use the options

    --rt-priority          prio for rt thread       (default: 68)
    --nrt-priority         prio for nrt thread      (default: 60)
    --receiver-priority    prio for receiver thread (default: 63)

In my case, jackd is run with `-R -P70'.

incudine foo.cudo -d 6.5 -R -s quux.rego

We can use multiple files and switch from realtime (-R) to non-rt (-N) and vice versa. In the follow example, quux is in realtime and bar writes a soundfile to disk.

cp quux.rego bar.rego
incudine foo.cudo -d 6.5 -R -s quux.rego -N -s bar.rego

Incudine uses Erik de Castro Lopo's libsndfile to read/write a soundfile from/to disk.

incudine --header-type-list
incudine --data-format-list

Header type and format of the sample are respectively `wav' (`aiff' on big endian machines) and `pcm-24'.

The follow example produces a flac file quux.flac

incudine foo.cudo --pad 1.2 -H flac -s quux.rego

and a ogg file quux.ogg

incudine foo.cudo --pad 1.2 -H ogg -F vorbis -s quux.rego

There is the possibility to add metadata. It is important to notice the comment in sndfile.h, the c header of libsndfile:

… Not all file types support this and even the file types which support one, may not support all string types.

Example:

incudine foo.cudo --pad 1.2 --title "Passame n'elettrodo" \
         --artist "Fabro Cadabro Band" -s quux.rego

sndfile-metadata-get --str-{title,artist} quux.wav

Often we want manipulate an input file. The next example shows how to use incudine for the convolution between two soundfiles. We put in conv.cudo the code to parse the user options and the definition of the DSP for the convolver.

cat > conv.cudo <<'---'
(defvar *pvbuf*
  (let ((buf (buffer-load (read-arg 1 nil))))
    (cond (buf (buffer->pvbuffer buf 2048))
          (t (msg error "Failed to open the IR")
             (exit 1)))))

(defvar *scale* (sample (or (read-arg 2) 1))))

(dsp! convolve ()
  (with-samples ((scale *scale*))
    (foreach-channel
      (cout (* scale (part-convolve (audio-in 0) *pvbuf*))))))
---

# Trivial rego file
echo 0 convolve > forge.rego

I use `–' to separate toplevel and user options. reverb.wav is the impulse response of a stereo reverb, sampled with sample rate 96 kHz, and voice.wav is an input file. The second user option is a scale factor for the output.

incudine conv.cudo -i voice.wav -r 96000 -s forge.rego -- reverb.wav 0.4

A function for the shell is immediate.

# Usage: convolve inputfile irfile [scale] [srate] [pad]

convolve() { incudine conv.cudo -i "$1" ${4:+-r $4} --pad ${5:-2} \
             -s forge.rego -- "$2" "$3" ; }

convolve voice.wav reverb.wav 0.4 96000

convolve voice48.wav ir48.wav 0.53 48000 2.5

# Remove the traces
unset -f convolve

If you have created the incudine command with the support for LV2, you can use LV2 plugins in your scripts. A trivial example:

cat > amp.cudo <<'---'
(lv2->vug "http://plugin.org.uk/swh-plugins/amp" swh.amp)

(dsp! amp-test (gain)
  (stereo (swh.amp gain (white-noise 1))))
---

cat > amp-test.rego <<'---'
0 amp-test -6 :id 1
1 set-control 1 :gain -12
2 set-control 1 :gain -4
3 set-control 1 :gain -20
4 set-control 1 :gain -5
5 free 1
---

incudine amp.cudo -s amp-test.rego

Another example, where a multi output plugin returns a FRAME:

cat > gverb.cudo <<'---'
(lv2->vug "http://plugin.org.uk/swh-plugins/gverb" gverb)

(dsp! gverb-test (room-size rev-time damping input-bw dry early-level
                  tail-level scale)
  (frame-out (gverb room-size rev-time damping input-bw
                    dry early-level tail-level (audio-in 0))
             2 0 scale))
---

cat > gverb-test.rego <<'---'
0 gverb-test 80 8 0.5 0.75 -70 0 -17 .4 :id 1
3 set-controls 1 :freq .3 :dt .05 :dry -77 :rev-time 30 :tail-level -7
6 set-control 1 :rev-time 1
---

incudine gverb.cudo -i voice.wav --pad 3 -r 96000 -s gverb-test.rego

If you have also created the incudine command with the support for LADSPA, here is an example to use LADSPA plugins:

cat > plate-rev.cudo <<'---'
(ladspa->vug "caps" "Plate" plate-reverb)

(dsp! plate-reverb-test (trig-freq input-decay input-scale bw tail damping blend)
  "Test of the Plate reverb developed by Tim Goetze."
  (with-samples ((in (* (decay (impulse trig-freq) input-decay)
                        (white-noise input-scale))))
    ;; PLATE-REVERB returns a frame because there are two outputs.
    (multiple-sample-bind (l r)
        (plate-reverb bw tail damping blend in)
      (out l r))))
---

cat > plate-rev-test.rego <<'---'
0 plate-reverb-test 4 .165 .5 .75 .5 .25 .25
2 set-controls 1 :trig-freq 1.5 :tail .8 :dumping .1 :blend .5
5 set-control 1 :trig-freq .1
8 free 1
---

incudine plate-rev.cudo -v -s plate-rev-test.rego

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