* Fixed two infinite loops in the WAV parser triggered by corrupt files declaring a negative chunk size. An RF64 `ds64` chunk with a negative `dataChunkLength`, or a `LIST/adtl` sub-chunk with a negative size, made the chunk walk advance by zero bytes per iteration and spin at 100% CPU without throwing. Negative and oversized sizes are now rejected where they are read, and an undersized `ds64` chunk throws `FormatException` rather than `ArgumentOutOfRangeException` (#1428) * Fixed `WaveIn`/`WaveOut` failing under Native AOT with `WaveHeaderUnprepared` ("The wave header was not prepared"). The `WAVEHDR` was a `[StructLayout]` class passed to winmm by value, which CoreCLR pins in place but NativeAOT copies into a per-call temporary, so the driver's `WHDR_PREPARED`/`WHDR_DONE`/`dwBytesRecorded` writes were discarded. It is now a struct in a stable unmanaged block (#1425) * Fixed `WaveFormat.MarshalToPtr` and `WaveFormat.MarshalFromPtr` corrupting any `WaveFormat` subclass under Native AOT — the AOT marshaller drops the inherited `WAVEFORMATEX` fields of a class hierarchy, so a `WaveFormatExtensible` was written with its SubFormat GUID over the sample rate. Every remaining site that sized or wrote a `WaveFormat` with `Marshal.SizeOf`/`StructureToPtr` was converted too: WASAPI (`AudioClient`), Media Foundation (`MFInitMediaTypeFromWaveFormatEx`, reachable from `MediaFoundationResampler`/`MediaFoundationEncoder`), DMO (`DmoMediaType.SetWaveFormat`, `MediaObject`) and ACM (`AcmStream`, `AcmDriver`) (#1425) * Added `WaveFormat.ToWaveFormatExBytes()`, which renders a `WaveFormat` as a native WAVEFORMATEX byte array. `MarshalToPtr` is now a thin wrapper over it, for callers who need an unmanaged block rather than a buffer they already own (#1425) * `WaveFormat.MarshalToPtr` now always allocates at least the `18 + cbSize` bytes it advertises. A `WaveFormat` subclass that declares `extraSize` but doesn't write it in `Serialize` previously produced a block shorter than its own `cbSize`, which a native consumer would read past (#1425) * **Breaking:** `AudioClient.IsFormatSupported` and `WasapiPlayer.IsFormatSupported` now return the closest-match format as `out WaveFormat` rather than `out WaveFormatExtensible`. WASAPI documents this format as either a `WAVEFORMATEX` or a `WAVEFORMATEXTENSIBLE`, and the old signature could only represent the latter — a plain format was previously decoded as a `WaveFormatExtensible` whose base fields were valid but whose extensible fields were meaningless. Callers needing the extensible fields should pattern-match (#1425) * Added a `Serialize` override to `Mp3WaveFormat`, which previously advertised `cbSize` = 12 but wrote none of its 12 MPEGLAYER3WAVEFORMAT extra bytes (#1425) * `NAudio.WinMM` is now marked `IsAotCompatible`, and the AOT smoke test covers the winmm WAVEHDR/WAVEFORMATEX paths (#1425) * Fixed `Mp3FileReaderBase` seeking silently restarting playback from the beginning of the file on MP3s with a Xing/Info header — the lazy frame index was gated on `IsLengthExact`, which such a header sets without any frame having been scanned. Also fixed seeks landing on the wrong frame when the target fell exactly on a frame boundary, and Xing/Info header frames being indexed as audio (shifting every seek in those files ~26 ms early). A 3.0.0 regression (#1419) * Fixed `WdlResamplingSampleProvider` losing samples, and eventually returning 0 permanently, when asked for more output than the source could supply — a 3.0.0 regression that broke the common pattern of reading generously from a `BufferedWaveProvider`-backed capture chain. `WdlResampler.ResampleOut` also no longer drifts in input-driven (feed) mode when handed fewer samples than `ResamplePrepare` requested (#1412)