NAudio.WinMM 3.1.0-preview.1

NAudio.WinMM

Nuget

Windows Multimedia (WinMM / winmm.dll) bindings for NAudio. Windows-only (net9.0-windows).

What's included

  • Playback — WaveOut for playing audio via the legacy WinMM API. The window-callback variant lives in NAudio.WinForms as WaveOutWindow
  • Recording — WaveIn for capturing audio from input devices. The window-callback variant is WaveInWindow in NAudio.WinForms
  • MIDI I/O — MidiIn / MidiOut for sending and receiving live MIDI messages
  • ACM — Audio Compression Manager wrappers: AcmStream, AcmMp3FrameDecompressor, driver enumeration
  • Device enumeration and capability queries for WinMM audio and MIDI devices

When to use it

Use this package when you need the classic WaveOut/WaveIn APIs — useful for broad compatibility with older Windows versions, for very simple playback/capture, or when you specifically want ACM codecs. For lower-latency playback, system loopback capture, or modern device enumeration prefer NAudio.Wasapi.

See the NAudio documentation site for tutorials and the full API reference, or the GitHub repository for full documentation and tutorials.

License

MIT.

Showing the top 20 packages that depend on NAudio.WinMM.

Packages Downloads
NAudio
NAudio, an audio library for .NET
 21
NAudio
NAudio, an audio library for .NET
 19
NAudio.WinForms
Windows Forms audio controls and window-callback variants of WaveOut/WaveIn for the NAudio audio library.
 19
NAudio
NAudio, an audio library for .NET
 18
NAudio.WinForms
Package Description
 18
NAudio.WinForms
Windows Forms audio controls and window-callback variants of WaveOut/WaveIn for the NAudio audio library.
 18
NAudio
NAudio, an audio library for .NET
 17
NAudio.WinForms
Package Description
 17
NAudio.WinForms
Package Description
 16

  • 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)

.NET 9.0

Version Downloads Last updated
3.1.1-preview.2 1 09/22/2026
3.1.1-preview.1 8 09/09/2026
3.1.0 7 09/07/2026
3.1.0-preview.2 8 09/06/2026
3.1.0-preview.1 7 09/06/2026
3.0.2-preview.2 7 09/01/2026
3.0.2-preview.1 8 08/21/2026
3.0.1 8 08/19/2026
3.0.1-preview.1 7 08/19/2026
3.0.0 11 08/19/2026
3.0.0-preview.20 11 08/11/2026
3.0.0-preview.19 9 08/06/2026
3.0.0-preview.18 12 07/18/2026
3.0.0-preview.17 15 07/16/2026
3.0.0-preview.16 9 07/01/2026
3.0.0-preview.15 5 09/15/2026
3.0.0-preview.14 4 09/15/2026
3.0.0-preview.10 0 06/08/2026
3.0.0-preview.9 2 09/10/2026
3.0.0-preview.8 1 09/15/2026
3.0.0-preview.7 2 09/15/2026
3.0.0-preview.6 0 05/21/2026
3.0.0-preview.5 1 09/17/2026
3.0.0-preview.4 2 09/09/2026
3.0.0-preview.3 1 09/15/2026
3.0.0-preview.2 4 09/09/2026
2.4.0 8 09/01/2026
2.3.0 21 05/30/2026
2.2.1 20 05/30/2026
2.2.0 16 05/30/2026
2.1.0 18 05/30/2026
2.1.0-beta.1 17 05/30/2026
2.0.1 19 05/30/2026
2.0.0 17 05/30/2026
2.0.0-beta2 20 05/29/2026
2.0.0-beta1 17 05/30/2026