#!/usr/bin/liquidsoap
# Example liquidsoap streaming from op25 to icecast
# (c) 2019, 2020 gnorbury@bondcar.com, wllmbecks@gmail.com
#
set("log.stdout", true)
set("log.file", false)
set("log.level", 3)
# Make the native sample rate compatible with op25
set("frame.audio.samplerate", 8000)
input = mksafe(input.external(buffer=0.25, channels=2, samplerate=8000, restart_on_error=false, "./audio.py -x 1.25 -s"))
# Consider increasing the buffer value on slow systems such as RPi3. e.g. buffer=0.25
# Longer buffer results in less choppy audio but at the expense of increased latency.
# OPTIONAL AUDIO SIGNAL PROCESSING BLOCKS
# Uncomment to enable
#
# High pass filter
input = filter.iir.butterworth.high(frequency = 200.0, order = 4, input)
# Low pass filter
#input = filter.iir.butterworth.low(frequency = 3250.0, order = 4, input)
# Compression
#input = compress(input, attack = 15.0, gain = 0.0, knee = 13.0, ratio = 2.0, release = 300.0, threshold = -18.0)
# Compand
#input = compand(input,mu = 0.5)
# Normalization
input = normalize(input, gain_max = 8.0, gain_min = -8.0, target = -16.0, threshold = -55.0)
# LOCAL AUDIO OUTPUT
# Uncomment the line below to enable local sound
#
# Default audio subsystem
#out (input)
#
# PulseAudio
#output.pulseaudio(input)
#
# ALSA
#output.alsa(input)
# ICECAST STREAMING
# Uncomment to enable output to an icecast server
# Change the "host", "password", and "mount" strings appropriately first!
# For metadata to work properly, the host address given here MUST MATCH the address in op25's meta.json file
#
output.icecast(%mp3(bitrate=16, samplerate=22050, stereo=false), description="op25", genre="NOAA Weather Radio",
url="", fallible=false, icy_metadata="false", host="audio(n).broadcastify.com", port=80, mount="bcfy_mount", password="bcfy_password",
mean(input))
