converting audio stream to amr-nb format in windows store app

Question

I want to compress my audio stream to amr-nb format to send to a network and also need to convert the receiving audio from amr-nb audio stream to pcm audio stream. How can it be possible with windows store app?

Answer 1

I think this can all be done but you'll need to convert the streams yourself using Media APIs in C++.

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Matt Small - Microsoft Escalation Engineer - Forum Moderator
If my reply answers your question, please mark this post as answered.

NOTE: If I ask for code, please provide something that I can drop directly into a project and run (including XAML), or an actual application project. I'm trying to help a lot of people, so I don't have time to figure out weird snippets with undefined objects and unknown namespaces.

Answer 2

I have tried with the following code to capture as amr-nb audio stream:

var capture = new MediaCapture();
await capture.InitializeAsync();
var recordProfile = new MediaEncodingProfile();
Windows.Media.MediaProperties.AudioEncodingProperties audioProp= new AudioEncodingProperties();
audioProp.ChannelCount = 1;
audioProp.BitsPerSample = 16;
audioProp.SampleRate = 8000;
audioProp.Bitrate = 16;                   
audioProp.Subtype = MediaEncodingSubtypes.AmrNb;                  
recordProfile.Audio = audioProp;
Windows.Media.MediaProperties.ContainerEncodingProperties containProp = new ContainerEncodingProperties();
containProp.Subtype = MediaEncodingSubtypes.Mpeg4;
recordProfile.Container = containProp;
recordProfile.Video = null;
var file = await KnownFolders.VideosLibrary.CreateFileAsync("captured.mp4", CreationCollisionOption.GenerateUniqueName);
await capture.StartRecordToStorageFileAsync(recordProfile,file);

But i got an exception : No Transform found for encoding or decoding.

Could you please help me to find a solution? 

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Jameson M Tinoy

Answer 3

Hello Matt,

Can you give some information about which Media APIs should use for Converting Raw Audio PCM audio stream to AMR stream?

I stuck in my project and i need this information.

please help me,

Thanks