Airtime/liquidsoap with replay gain

%include "library/pervasives.liq"
%include "/etc/airtime/liquidsoap.cfg"

set("log.file.path", log_file)
set("log.stdout", true)
set("server.telnet", true)
set("server.telnet.port", 1234)

queue = request.queue(id="queue", length=0.5)
queue = audio_to_stereo(queue)

pypo_data = ref '0'
web_stream_enabled = ref false
stream_metadata_type = ref 0
station_name = ref ''
show_name = ref ''

%include "ls_lib.liq"

server.register(namespace="vars", "pypo_data", fun (s) -> begin pypo_data := s "Done" end)
server.register(namespace="vars", "web_stream_enabled", fun (s) -> begin web_stream_enabled := (s == "true") string_of(!web_stream_enabled) end)
server.register(namespace="vars", "stream_metadata_type", fun (s) -> begin stream_metadata_type := int_of_string(s) s end)
server.register(namespace="vars", "show_name", fun (s) -> begin show_name := s s end)
server.register(namespace="vars", "station_name", fun (s) -> begin station_name := s s end)


default = amplify(0.00001, noise())
default = rewrite_metadata([("artist","Airtime"), ("title", "offline")],default)

s = fallback(track_sensitive=false, [queue, default])
enable_replaygain_metadata ()
s = amplify(1.,override="replay_gain",s)
s = on_metadata(notify, s)
s = crossfade(s)
# Attach a skip command to the source s:

#web_stream_source = input.http(id="web_stream", autostart = false, buffer=0.5, max=20., "")

#once the stream is started, give it a sink so that liquidsoap doesn't
#create buffer overflow warnings in the log file.
#output.dummy(fallible=true, web_stream_source)

#s = switch(track_sensitive = false,
#    transitions=[to_live,to_live],
#    [
#      ({ !web_stream_enabled }, web_stream_source),
#      ({ true }, s)
#    ]
#)

add_skip_command(s)
s = map_metadata(append_title, s)


if output_sound_device then
	out_device = out(s)
end

if output_icecast_mp3 then
        out_mp3 = output.icecast(%mp3,
                        host = icecast_host, port = icecast_port,
                        password = icecast_pass, mount = mount_point_mp3,
                        fallible = true,
                        restart = true,
                        restart_delay = 5,
                        url = icecast_url,
                        description = icecast_description,
                        genre = icecast_genre,
                        s)
end

if output_icecast_aacplus then
        out_vorbis = output.icecast(%aacplus(channels=2, samplerate=44100, bitrate=64),
                        host = icecast_host, port = icecast_port,
                        password = icecast_pass, mount = mount_point_aacplus,
                        fallible = true,
                        restart = true,
                        restart_delay = 5,
                        url = icecast_url,
                        description = icecast_description,
                        genre = icecast_genre,
                        s)
end