NAudio is an open source .NET audio library written by Mark Heath (mark.heath@gmail.com) We're currently in the process of migrating from CodePlex. For now, if you are looking for help and documentation, visit http://naudio.codeplex.com. The latest source code is here on GitHub.

• Play back audio using a variety of APIs
  • WaveOut
  • DirectSound
  • ASIO
  • WASAPI (Windows Vista and above)
• Read audio from many standard file formats
  • WAV
  • AIFF
  • WMA
  • SoundFont files (SF2)
• Decode many popular audio compression types
  • MP3 (using ACM, DMO or MFT)
  • G.711 mu-law and a-law
  • ADPCM
  • G.722
  • Speex (using NSpeex)
  • WMA, AAC, MP4 and more others with Media Foundation
• Convert between various forms of uncompressed audio
  • Change the number of channels - Mono to stereo, stereo to mono
  • Modify bit depth (8, 16, 24, 32 integer or 32 bit IEEE float)
  • Resample audio using a choice of resampling algorithms
• Encode audio using any ACM or Media Foundation codec installed on your computer
  • Create MP3s on Windows 8 and above
  • Create AAC/MP4 audio on Windows 7 and above
  • Create WMA files
  • Create WAV files containing G.711, ADPCM, G.722, etc.
• Mix and manipulate audio streams using a 32-bit floating mixing engine
  • construct signal chains
  • examine sample levels for the purposes of metering or waveform rendering
  • pass blocks of samples through an FFT for metering or DSP
  • delay, loop, or fade audio in and out
  • Perform EQ with a BiQuad filter (allowing low pass, high pass, peaking EQ, etc.)
• Record audio
  • using WaveIn, WASAPI or ASIO
• Work with soundcards
  • Enumerate devices
  • Access soundcard controls and metering information
• Full MIDI event model
  • Read and write MIDI files
  • Respond to received MIDI events
  • Send MIDI events
• An extensible model
  • All base classes easily inherited from for you to add your custom components
• Support for Windows RT
  • Create Windows 8 Store apps and Windows Universal apps