MediaFoundationEncoder includes a useful helper function called SelectMediaType which can help you do this. Basically, you may find you have to install the "Desktop Experience" before you have any codecs available.īut the best way to find out whether the codec you want is available is simply to ask the Media Foundation APIs whether there are any encoders that can target your desired format for the given input format. There are rumours that a FLAC encoder will be present in Windows 10.įor server versions of Windows, the story is a bit more complicated. Windows 7 introduced an AAC encoder, and it was only with Windows 8 that we finally got an MP3 encoder (although MP3 decoding has been present in Windows for a long time). The Windows Media Audio (and the Windows Media Voice) codec, are unsurprisingly present on all the desktop editions of Windows from Vista and above. However, not all codecs are present on all versions of Windows.
Since I planned to make use of whatever encoders are available on the user’s machine, I don't need to ship any codecs with my application. This means that if you need to support Windows XP, you will not be able to use Media Foundation.
Note that Media Foundation is only supported on Windows Vista and above. You only need to do this once in your application, but it doesn’t matter if you call it more than once. This requires a call to MediaFoundation.Startup(). The first step is to make sure Media Foundation is initialised. It can be any IWaveProvider, so there is no need to create a temporary WAV file before the encoding takes place. The input to the MediaFoundationEncoder doesn't actually have to be a WAV file.
The WavFormat that Skype uses is 16kHz 16 bit mono PCM, and I capture the audio directly in this format, before converting it to the target format when the call finishes. The application is my new Skype Voice Changer utility, and I wanted to allow users to save their Skype conversations in a variety of different formats.
And to do so, I'll walk you through a real-world example of some code I created recently that uses it. In this post I am going to explain how the NAudio MediaFoundationEncoder class can be used to convert WAV files into other formats such as WMA, AAC and MP3.
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