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# Study Player — Update system (ON_UPDATE).
#
# Every frame:
# 1. Calls Rl.update_music_stream (pumps the audio buffer).
# 2. Manages current_time: while skip_auto_update > 0, decrements it
# without sampling the audio engine; otherwise samples via
# Rl.get_music_time_played. This implements the non-blocking seek
# cooldown.
# 3. Detects end-of-track (current_time >= duration) and auto-pauses.
#
# See: notes/study-player-rewrite-plan.md §7 (non-blocking seek design)
module StudyPlayer
class UpdateSystem
def self.build(world, player_entity, runtime, playback_state)
world.system("Update", with: [], phase: Flecs::ON_UPDATE) do
pb = player_entity.get(playback_state)
next unless pb && pb[:loaded]
audio = runtime.audio
# Always pump the stream (needed even when paused to keep buffers filled)
audio.update if audio.loaded?
if pb[:playing] && audio.loaded?
if pb[:skip_auto_update] > 0
# Non-blocking seek cooldown: skip sampling current time from the
# audio engine for N frames so it catches up without visual flicker.
pb[:skip_auto_update] -= 1
else
# Normal time sampling
pb[:current_time] = audio.current_time
end
# End-of-track detection: pause when playback reaches the end
duration = audio.duration
if duration > 0 && pb[:current_time] >= duration - 0.1
audio.pause
pb[:playing] = false
pb[:current_time] = duration
end
player_entity.set(playback_state, pb)
end
end
end
end
end
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