Test(channels): switch to channels is delayed #37

tests/test_queue_activate.liq

+#!/usr/bin/env liquidsoap
+#
+# Aura Engine (https://gitlab.servus.at/aura/engine)
+#
+# Copyright (C) 2017-now() - 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/>.
+
+
+%include "base_config.liq"
+settings.log.level.set(3)
+
+
+##################################################################################################
+# Setup sources
+
+# Create fallback playlist
+fallback_folder = playlist(id="fallback_folder", "../audio/fallback", mode="randomize")
+fallback_folder = mksafe(fallback_folder)
+
+# Event handlers
+def on_metadata_notification(meta) =
+    print("on_metadata - update (TRACK: #{meta['title']}, ON AIR: #{meta['on_air']}")
+end
+def on_track_notification(meta) =
+    print("on_track    - update (TRACK: #{meta['title']}, ON AIR: #{meta['on_air']}")
+end
+
+# Create mixer with one queue
+in_queue = request.queue(id="in_queue")
+mixer = mix(id="mixer", [ in_queue ])
+stripped_mixer = blank.strip(max_blank=5., mixer)
+
+# Output
+main_out = fallback(track_sensitive=false, [stripped_mixer, fallback_folder])
+main_out.on_metadata(on_metadata_notification)
+main_out.on_track(on_track_notification)
+output.alsa(device="default", mksafe(main_out), bufferize=true)
+
+##################################################################################################
+# Test case (Liquidsoap 2.1, final deb version)
+# $ liquidsoap --version
+# Liquidsoap 2.1.0
+
+# 1. Add requests
+r1 = request.create("assets/audio.mp3")
+r2 = request.create("assets/audio.mp3")
+r3 = request.create("assets/audio.mp3")
+in_queue.push(r1)
+in_queue.push(r2)
+in_queue.push(r3)
+
+# 2. Fallback is playing
+print("Fallback playing")
+
+# 3. Wait 5 seconds and activate queue via server commands
+def enable_queue() =
+    print("Activate queue")
+    r = server.execute("mixer.select 0 true")
+    print(r)
+    r = server.execute("mixer.volume 0 1")
+    print(r)
+end
+thread.run(delay=5., { enable_queue() })
+
+# 4. Metadata is issued instantly (after the 5 seconds from above):
+#
+# on_metadata - update (TRACK: Two Pianos), ON AIR: 2022/08/02 12:58:03
+# on_track    - update (TRACK: Two Pianos), ON AIR: 2022/08/02 12:58:03
+
+# 5. FAIULURE: Audio from the queue starts playing only approx. 23 seconds later
+# This delay of 23 seconds is always the same, no matter when the server commands
+# are issued (e.g. 30secs later) nor how many requests are pushed to the queue
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