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feat(alerts): TASK 47 — alert box plays a video (built-in/custom clip) + read-time fade + message ticker

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TASK 43's alert box grows a real video celebration. Per-alert IAlertClipDecoder
(ffmpeg bgra + f32le pipes, real-time paced, disposed at drain) plays the shipped
Assets/alert-default.mp4 (stamped into the Asset table at startup) unless the
creator picks their own file — path reference only, never stored in the DB; the
six AlertRenderer animations stay the fallback. ~0.3s fade rides the alpha
envelope on straight-source copies (EOF freeze-frames then fades out); audio
forwards to a new AudioMixer alert ring (8s, 48k stereo) drained at unity — no
duck, creator ruling — scaled by volume × fade. An auto-composed marquee ticker
('Funder — Super Chat · $10.00', 140px/s) scrolls top-of-frame via a
FramePump._alertTicker seam through Render/CompositeLayers, mixed into the cache
signature (dynamic overlay, never baked). New Stream Alerts section in LeftPanel.

Derivative-work references (how OBS/Streamlabs alert boxes do per-alert video):
- https://support.streamlabs.com/hc/en-us/articles/217741147-Setting-Up-Your-Streamlabs-Alerts (custom image/video per alert type + variations)
- https://obsproject.com/kb/stream-tutorial-2-alerts (alert overlay as an on-screen zone)
- https://streamlabs.com/content-hub/widgets/alert-box (per-event alert playback)

Good Dog: AlertLayerVideoTests drives a fake IAlertClipDecoder through the whole
lifecycle in one pass (custom path wins, decoder spawns/disposes, fade envelope
0→127→255, audio volume×fade, ticker scrolls, EOF fade-drain to idle). It caught
the clip branch of Advance not clearing _current before AdvanceToNext — the layer
stayed IsPlaying after drain (MyMistakes post-mortem).

Full vstest 319/319; clean build 0 warnings; scope check green.
This commit is contained in:
Llama Chile Shop
2026-09-26 11:15:17 -07:00
parent 2c9af9426b
commit a11b15e444
23 changed files with 1399 additions and 87 deletions
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Controls/LeftPanel.xaml
+49
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@@ -444,6 +444,55 @@
IsChecked="{Binding SelectedElement.ChatShowBadges, Mode=TwoWay}"/>
</StackPanel>
<!-- Stream Alerts config -->
<StackPanel Visibility="{Binding SelectedElement.IsAlertBox, Converter={StaticResource BoolToVis}}" Margin="0,0,0,8">
<TextBlock Text="Stream Alerts" Foreground="#a0a0b0" FontSize="11" FontWeight="SemiBold" Margin="0,0,0,6"/>
<TextBlock Text="The built-in clip plays on every alert (Super Chat, membership…) unless a custom video is picked."
Foreground="#888" FontSize="10" TextWrapping="Wrap" Margin="0,0,0,6"/>
<DockPanel Margin="0,0,0,4">
<TextBlock DockPanel.Dock="Left" Text="Built-in video" Foreground="#a0a0b0" FontSize="11" VerticalAlignment="Center" Width="84"/>
<ToggleButton Style="{StaticResource PillToggle}"
IsChecked="{Binding SelectedElement.AlertUseDefaultVideo, Mode=TwoWay}"
HorizontalAlignment="Left"/>
</DockPanel>
<Grid Margin="0,0,0,4"
Visibility="{Binding SelectedElement.AlertUseDefaultVideo, Converter={StaticResource InverseBoolToVis}}">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="Auto"/>
</Grid.ColumnDefinitions>
<TextBox Grid.Column="0" Text="{Binding SelectedElement.AlertVideoPath, Mode=OneWay}"
IsReadOnly="True" Background="#0f3460" Foreground="#a0a0b0"
FontSize="11" VerticalAlignment="Center"/>
<Button Grid.Column="1" Content="Browse…" Command="{Binding BrowseAlertVideoCommand}"
CommandParameter="{Binding SelectedElement}" Style="{StaticResource YtButtonSecondary}"
Margin="4,0,0,0" Padding="8,2"/>
</Grid>
<Button Content="Reset to built-in" Command="{Binding ResetAlertVideoCommand}"
CommandParameter="{Binding SelectedElement}" Style="{StaticResource YtButtonSecondary}"
HorizontalAlignment="Left" Padding="8,2" Margin="0,0,4,0"/>
<TextBlock Text="Custom clips are referenced from disk — never stored in the layout."
Foreground="#888" FontSize="10" TextWrapping="Wrap" Margin="0,4,0,6"/>
<DockPanel Margin="0,0,0,4">
<TextBlock DockPanel.Dock="Left" Text="Message ticker" Foreground="#a0a0b0" FontSize="11" VerticalAlignment="Center" Width="84"/>
<ToggleButton Style="{StaticResource PillToggle}"
IsChecked="{Binding SelectedElement.AlertShowTicker, Mode=TwoWay}"
HorizontalAlignment="Left"/>
</DockPanel>
<DockPanel Margin="0,0,0,4">
<TextBlock DockPanel.Dock="Left" Text="Volume" Foreground="#a0a0b0" FontSize="11" VerticalAlignment="Center" Width="84"/>
<Slider Width="120" Minimum="0" Maximum="1"
Value="{Binding SelectedElement.AlertVideoVolume, Mode=TwoWay}"
VerticalAlignment="Center"/>
<TextBlock DockPanel.Dock="Right" Text="{Binding SelectedElement.AlertVideoVolume, StringFormat={}{0:0%}}" Foreground="#e0e0e0" FontSize="11" Margin="6,0,0,0" VerticalAlignment="Center" Width="32"/>
</DockPanel>
</StackPanel>
<!-- Background properties -->
<StackPanel Margin="0,8,0,0"
Visibility="{Binding SelectedElement.IsBackground, Converter={StaticResource BoolToVis}}">