Complete redesign of AudioVisualizerView based on feedback: the orb
is now the app's visual face, takes the top ~60% of the chat area,
and has clearly distinct behaviour in each state.
- **Idle**: slow 5 s breathing (scale 0.88 → 1.00 via cos easing),
pure round shape, soft halo in phase. No high-frequency motion.
- **Listening**: organic blob outline built from 8 Fourier modes
whose amplitude scales with live mic RMS; a thin shimmering arc
rotates around the orb while mic energy is present; continuous
micro-ripples pulse outward. Looks clearly 'alive and attentive'
vs Idle's static breathing.
- **Speaking**: the orb becomes a contained spectrometer. A pre-
computed log-spaced spectrogram (12 bands, 120 Hz–4 kHz,
Hann-windowed FFT, one column per 50 ms of audio) is rendered as
vertical rounded-rectangle bars CLIPPED to the sphere outline so
they really look like the sphere itself speaking. Bar heights
interpolate between spectrogram frames and exponentially smooth
toward the target for fluid 60 fps motion. Outer halo pulses with
the RMS envelope; ripples release on envelope peaks.
- **Per-voice color**. Eight-entry palette (Damien lavender,
Elodie rose, Jerome aqua, Richard amber, Amir emerald, Didier
indigo, Sid peach, Zelda periwinkle). Halo, accent, bars, ring,
and ripples are all derived from a single voiceColor so switching
the voice spinner tweens the entire scene to the new identity
over a few frames. Color stored on both KazeiaService (for
persistence across process/view rebinds) and pushed directly to
the view for instant feedback at selection time.
Sidecar pipeline changes:
- Qwen3TtsEngine now computes per-segment spectrogram alongside the
RMS envelope (new computeSpectrogram + an in-place radix-2 FFT).
FFT_SIZE = 1024, hop = 50 ms, 12 log-spaced bands. SegmentReady
carries both arrays; onSegmentPlaying is (sentence, durationMs,
rmsEnvelope, spectrogram).
- KazeiaPipeline.speakText forwards the new callback shape.
- KazeiaService.VisualizerSignal.Speaking now carries the
spectrogram and the new voiceColor StateFlow.
- ChatActivity passes both to the view and collects voiceColor.
Layout: vertical chain between audioViz (weight 3) and rvMessages
(weight 2) so the orb owns ~60% of the chat panel and the chat list
takes the remainder. Removed the fixed 140 dp constraint.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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