How to get raw data of decoded mp3 file in metro style ?

Question

Dear all,

How can I get raw data from a mp3 file in metro style ?

WinRT api seems doesn't have the api to the task.

MediaEncodingProfile doesn't support PCM.

Thanks.

Best regards,

dupre

Answer 1

You can get the raw data by opening the file and reading the raw bytes.

http://msdn.microsoft.com/en-us/library/windows/apps/windows.storage.storagefile.aspx

It is up to you to interpret that data however you want!

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Jeff Sanders (MSFT)

Answer 2

Hi, ipsanders,

Sorry, my quesiton is not clear. I know I can use StorageFile to open read a file.

I wonder how to decode mp3 file and get the decoded data in metro style.

I know a mp3 file consists of id3tag and frames. Does metro style supply the

suitable class or api to decode the frames into the buffer, then I can get the

decoded raw data(not compressed audio data) to use.

I know MediaEncodingProfile can do audio format transform, but someone said

Developer Preview disabled this feature. So, I need to find another way to get

decoded raw data from mp3 file in metro style.

Thanks.

Best regards,

dupre

Answer 3

Hello dupre,

This is actually fairly easy using Media Foundation, C++ and modern COM. Take a look at the IMFSourceReader interface. This should do what you need.

Win32 and COM for Metro style apps (multimedia)

http://msdn.microsoft.com/en-us/library/windows/apps/hh452756.aspx

IMFSourceReader interface

http://msdn.microsoft.com/en-us/library/windows/apps/dd374655.aspx

I hope this helps,

James

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Windows Media SDK Technologies - Microsoft Developer Services - http://blogs.msdn.com/mediasdkstuff/

Answer 4

Dear James,

Thanks for your helpful advice, I will try it.

Best regards,

dupre

Answer 5

Bumping this for clarification...

If I were to create an IMFSourceReader on any sort of audio file, as long MF in Windows knows how to decode it, I'll be getting decoded samples?