feat(audio): add ModeStack pure refcount helper (SDD-108)

Introduce ModeStack, a pure-Rust refcount-composable wrapper for
Android audio-mode acquire/release with prior-mode snapshot. Per
SDD-108 §1/§2 the engine snapshots the system audio mode on first
acquire and restores it on last release; composed acquires are
no-ops while the mode is held.

ModeStack is panic-free; release-on-zero returns AlreadyReleased
rather than panicking. Six SWE4-UV-045-tagged unit tests cover the
acquire/release semantics on the host target.

Trace: SDD-108, SWE4-UV-045.

This commit is contained in:

EdisonJwa

2026-05-18 10:30:25 +08:00

parent dc9c5c0a4e

commit da0b208075

2 changed files with 244 additions and 0 deletions

									
										crates/chanora_audio/src/lib.rs
									
		+1
		
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				@@ -29,6 +29,7 @@

				#![warn(missing_docs)]

				mod engine;

				pub mod mode_stack;

				pub mod ptt;

				pub mod ptt_backends;

				pub mod release_tail;