enricobuehler e8499e6131 feat(android): wire tier-A pad audio through the capture lifecycle and settings ...

The Kotlin half. Turns out Android needs to claim nothing extra: `uac-host`
claims the pad's audio interface itself through usbfs on the fd, and usbfs
claims are per interface, so the HID claim `HidUsbLink` already holds is
untouched. The link therefore surrenders only its file descriptor.

Two orderings carry the whole design, and both are easy to get wrong:

- **Start on the first report, not at claim time.** The wire pad index does not
  exist until the router opens a slot, and the host addresses the 0xD1 stream by
  that index — starting earlier would declare capabilities for a pad that has no
  index yet.
- **Stop before the link closes.** `usb.stop()` closes the connection whose
  descriptor the render thread borrows, so `padAudio.stop()` runs first, at the
  top of `DsCapture.stop()`. `nativeStopPadAudio` does not return until the
  thread is joined, which is what makes the borrow sound rather than merely
  usually-fine.

`DsCapture` decides WHEN (it owns the wire index and the link lifetime);
`StreamScreen` decides WHETHER (it owns the session handle and the settings).
The capture stays ignorant of sessions.

Settings: `padHaptics` defaults on — it is the whole point, and this client's
rumble already drives the same actuators, so tier A is a strict improvement.
`padSpeaker` defaults OFF: it is a small loudspeaker in the user's hands playing
audio they can already hear, and surprising someone with that is worse than
making them opt in.

Verified: APK builds, and both JNI entry points are exported in the shipped
arm64 .so — a missing one would be an UnsatisfiedLinkError only at runtime.
12 Rust tests, 0 clippy findings, fmt clean.

2026-08-02 23:51:28 +02:00

..

src

feat(android): wire tier-A pad audio through the capture lifecycle and settings

2026-08-02 23:51:28 +02:00

build.gradle.kts

fix(client/android): the build resolves cargo from CARGO_HOME before guessing ~/.cargo

2026-07-29 21:47:07 +02:00