#!/bin/sh
 
FORMANT="autoaudiosrc"
 
# In order to have a MIDI carrier use the alsa loopback device and Timidity++ like this:
#
#   $ sudo modprobe snd-aloop
#   $ timidity -Os -o "hw:Loopback,0,0" -iA --sequencer-ports 1
#
# then connect to Timidity++ with a MIDI input device, e.g.:
#
#   $ xset -r
#   $ vkeybd --device alsa --addr 129:0
#   $ xset r on
#
# and have a lot of fun vocoding the crap out of your formant channel
CARRIER_TONE="alsasrc device=hw:Loopback,1,0 ! audioconvert"
 
# Add some white noise to the carrier
CARRIER_PARAMS="$CARRIER_TONE ! carrier. audiotestsrc wave=5 volume=0.1 ! carrier."
CARRIER="adder name=carrier"
 
SINK="autoaudiosink"
 
gst-launch-1.0 -v interleave name=i ! \
  capssetter caps="audio/x-raw,channels=2,channel-mask=(bitmask)0x3" ! audioconvert ! audioresample ! \
  ladspa-vocoder-1337-so-vocoder-lmms \
    number-of-bands=16 \
    left-right=0 \
    band-1-level=1 \
    band-2-level=1 \
    band-3-level=1 \
    band-4-level=1 \
    band-5-level=1 \
    band-6-level=1 \
    band-7-level=1 \
    band-8-level=1 \
    band-9-level=1 \
    band-10-level=1 \
    band-11-level=1 \
    band-12-level=1 \
    band-13-level=1 \
    band-14-level=1 \
    band-15-level=1 \
    band-16-level=1 \
  ! $SINK \
  $FORMANT ! audioconvert ! audioresample ! audio/x-raw, rate=44100, format=S16LE, channels=1 ! queue ! i.sink_0 \
  $CARRIER ! audioconvert ! audioresample ! audio/x-raw, rate=44100, format=S16LE, channels=1 ! queue ! i.sink_1 \
  $CARRIER_PARAMS