forked from unom/punktfunk
enricobuehlerandClaude Opus 5
9409d0a04c
Two defects sat between the pad-audio endpoint and any sound. Neither was where the symptom pointed. `windows 0.62` implements `Drop for PROPVARIANT` as `PropVariantClear(self)`. Every variant `set_store_value` builds borrows memory Rust owns — a `Vec<u16>`, a `&GUID`, a `&'static [u8]` — so each stamp handed that pointer to `CoTaskMemFree`. The file said the opposite in a comment, which is why it looked safe. The damage surfaced late: `pad-endpoint ensure` died with STATUS_HEAP_CORRUPTION (0xC0000374) partway through stamping, leaving the endpoint with whatever subset had landed and `needs_aeb_kick` stuck true forever. With the variants held in `ManuallyDrop`, `ensure` exits 0 and all seven stamps read back served for the first time. `wasapi 0.23`'s `DeviceEnumerator::get_device` builds its argument as `PCWSTR::from_raw(HSTRING::from(id).as_ptr())`; the `HSTRING` is a temporary, so `GetDevice` reads freed memory. That is where the `IAudioClient: 0x80070002` came from — not from the endpoint, which activates fine. Resolving through `open_mmdevice`, which keeps its buffer alive, retires the error in both the tone devtest and the loopback capture. Also adds the instrument that separated these: the tone path now reports the raw `IMMDevice::Activate` result alongside the crate's, and `pad-endpoint tone --endpoint <id>` can drive any endpoint, so "this process cannot activate anything" and "this endpoint is broken" stop looking identical. Verified on .173: ensure exit=0, 7/7 stamps served, needs_aeb_kick=false, 0x80070002 gone. Host clippy clean; 360 tests pass (the one mgmt display failure reproduces on a clean tree). Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>