Live video preview

Purpose

Show how the phone requests synchronized video + audio streams from the glasses and renders NV21 previews locally.

Entry points

Phone home:

• MainPhoneActivity → VideoReceiveActivity

Sample screen:

• com.rokid.phone.VideoReceiveActivity

Platform

• Phone

Main file

• VideoReceiveActivity.kt

Flow

1. User configures FPS + bitrate guard rails.
2. requestVideoStream() primes the outbound lane.
3. requestAudioStream() parallels audio.
4. IMessageListener.onNv21Data() feeds NV21 frames into GLSurfaceView.
5. onClassicBTAudioStream() hands PCM-ish buffers to playback helpers.

SDK capabilities exercised

• Start/stop video pull
• Start/stop audio pull
• Live NV21 callback plumbing

FAQ

Good for what?

Live preview QA, bitrate sweeps, and transport smoke tests—not finished recording UX.

What format arrives?

RAW NV21 planes rendered client-side—not a packaged .mp4 download.

Caveats

• FPS clamps 5–30; bitrate clamps 500k–10Mbps.
• Activity pauses aggressively stop streaming when leaving foreground.