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  • #!/usr/bin/liquidsoap
    
    #
    # Aura Engine (https://gitlab.servus.at/aura/engine)
    #
    # Copyright (C) 2017-2020 - The Aura Engine Team.
    #
    # This program is free software: you can redistribute it and/or modify
    # it under the terms of the GNU Affero General Public License as published by
    # the Free Software Foundation, either version 3 of the License, or
    # (at your option) any later version.
    #
    # This program is distributed in the hope that it will be useful,
    # but WITHOUT ANY WARRANTY; without even the implied warranty of
    # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    # GNU Affero General Public License for more details.
    #
    # You should have received a copy of the GNU Affero General Public License
    # along with this program.  If not, see <http://www.gnu.org/licenses/>.
    
    
    
    icecast_vorbis_metadata = false
    inputs = ref []
    
    # Load settings from ini file
    %include "settings.liq"
    
    # Include some functions
    %include "library.liq"
    
    #####################################
    #              EVENTS               #
    #####################################
    
    # Called when some new metadata info is available
    def on_metadata_notification(meta) =
        filename = meta["filename"]
        track_duration = request.duration(filename)
        json_data = json_of(meta)
        json_data = '{ "action": "on_metadata", "data": #{json_data}, "track_duration": "#{track_duration}" }'
        # There's currently an issue with Liquidsoap http.post requests:
        # headers = [("Content-Type","application/json; charset=utf-8")]
    
        # ignore(http.post(headers=headers, data="#{json_data}", "http://#{engine_control}"))
        ignore(system("curl -X POST -H 'Content-Type: application/json' --data '#{json_data}' #{engine_control}"))
    
    end
    
    #####################################
    #              INPUTS               #
    #####################################
    
    # Enable queue sources
    %include "in_queue.liq"
    
    # Enable fallback sources
    %include "in_fallback.liq"
    
    # Enable stream overtakes
    %include "in_stream.liq"
    
    # Enabled line in from soundcard
    %include "in_soundcard.liq"
    
    
    #####################################
    #             ROUTING               #
    #####################################
    
    
    # When some regular playout is happening and it is returned to the fallback,
    # we don't want to resume the previous fallback track:
    def on_track_change(s) = 
        source.skip(station_playlist)
        source.skip(station_folder)
    end
    
    
    mixer = mix(id="mixer", 
            list.append(
                [
                    input_filesystem_0, 
                    input_filesystem_1, 
                    input_http_0, 
                    input_http_1, 
                    input_https_0, 
                    input_https_1
                ], 
                !inputs
            )
        )
    
    stripped_stream = strip_blank(
            id="strip_blank", 
            track_sensitive=false, 
            max_blank=fallback_max_blank, 
            min_noise=fallback_min_noise, 
            threshold=fallback_threshold, 
            mixer
        )
    
    stripped_stream = on_track(on_track_change, stripped_stream)
    
    fallback_one = fallback(
        id="fallback-scheduled", 
        track_sensitive=false,
        replay_metadata=true,
        [ stripped_stream, stripped_fallback_mixer])
    
    fallback_one = on_track(on_track_change, fallback_one)
    
    fallback_two = fallback(
        id="fallback-station-playlist", 
        track_sensitive=false,
        replay_metadata=true,
        [ fallback_one, station_playlist])
    
    fallback_three = fallback(
        id="fallback-station-folder", 
        track_sensitive=false,
        replay_metadata=true,
        [ fallback_two, station_folder])
    
    output_source = fallback_three
    
    #####################################
    #             OUTPUTS               #
    #####################################
    
    # create soundcard output
    %include "out_soundcard.liq"
    
    # stream output
    %include "out_stream.liq"
    
    # enable socket functions
    %include "serverfunctions.liq"