Break the 1747-line clients/android/native/src/decode.rs into a decode/ directory
module (mod.rs + 5 concern submodules):
- decode/setup.rs : codec creation + low-latency config + thread/frame-rate
tuning + HDR static-info encode
- decode/display.rs : DisplayTracker + render-callback registration + HDR dataspace
- decode/latency.rs : realtime clock + decoded-pts / user-flags stat recording
- decode/sync_loop.rs : the synchronous poll decode loop (+ feed/drain) — moved WHOLE
- decode/async_loop.rs : the event-driven async decode loop (+ helpers) — moved WHOLE
decode/mod.rs keeps the consts, DecodeOptions, and the `run` entry point + the
`codec_mime`/`codec_label` re-export, so every crate::decode::X path stays byte-stable.
The module has no decoder struct (free functions + small types), so both decode loops
move byte-for-byte and their separately-inlined received-stat recording is NOT unified.
16 helper fns/types became pub(super) for sibling access; zero field bumps. lib.rs
unchanged (`#[cfg(target_os="android")] mod decode;` resolves to decode/mod.rs).
Verified: cargo-ndk check (aarch64-linux-android, clean) + the gradle cargoNdkDebug
build (arm64-v8a / armeabi-v7a / x86_64). On-device runtime re-verification still owed
per the plan (the two decode loops are a hot path).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
