Agent state visualization

[pblazej]

• Adds AgentBarAudioVisualizer
  • it performs sequence-based animations for different agent states
  • it does not use PhaseAnimator that would need a "step" animation curve to achieve the desired effects without .delay, also we cannot simply reset the animation
  • it's not a simple wrapper around BarAudioVisualizer anymore, as we need item-based opacity
  • there's some duplication, but I'm open for suggestions here
• Splits AudioProcessor into a separate file

Considerations

• We need some form of .id(track) or explicit if around empty track state to reinstantiate @StateObject of audio processor (and make it update the waveform) which is sort of a leaky abstraction - a separate initializer with non-optional track would be probably better

[pblazej]

Use for testing livekit-examples/agent-starter-swift#4

[CLAassistant]

All committers have signed the CLA.

[bcherry]

This makes sense to me and seems ok to duplicate the bar although you might consider unifying their options in a separate struct that they both consume to reduce documentation duplication

as to the thought about forcing re-renders: I agree with that and open to ideas that make it easier to use.

[pblazej]

unifying their options in a separate struct that they both consume to reduce documentation duplication

Yes, we should agree on a convention here, e.g. ComponentNameStyle struct and apply everywhere. I think this is the 1st component with "many props" so I'm happy to apply it here as well.

forcing re-renders

I think the cleanest approach would be to create a PlaceholderBarVisualizer without track param that just wraps the full one (having non-optional track). It makes the intention clear at least that this is a skeleton that won't initialize any audio processing.

[pblazej]

Maybe this is less ugly without altering Track hashability etc. livekit-examples/voice-assistant-swift@7883e4d (#4)

[hiroshihorie]

Pretty cool!
Is it possible to fade the transitions between agent Listening vs Speaking ?
Feels a bit glitchy IMO.

agent-vis.mov

[pblazej]

Pretty cool! Is it possible to fade the transitions between agent Listening vs Speaking ? Feels a bit glitchy IMO.

We need to do that manually unfortunately playing with phases, but let's see 🤞

[pblazej]

@hiroshihorie 371c55b should do the trick, feel free to adjust the timing/curve.

[hiroshihorie]

Looks perfect ✅