Reading Meta data from audio files

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Article Metadata

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Article

Created: symbianyucca (22 Mar 2007)

Last edited: hamishwillee (26 Jul 2012)

Following GetMetaDataL() function illustrates how to read meta data entries from the audio file. As shown with the function it requires a CMdaAudioPlayerUtility (could also be CMdaAudioRecorderUtility) which also needs to be fully opened with the file, see Audio playing example to see how to open a audio file with CMdaAudioPlayerUtility.

With this example only Title, Album, Artist and Genre entries are retrieved, for information on the other metadata entry IDs you could have a look into the MmfMeta.h header.

GetMetaDataL

#include <MmfMeta.h>
 
void GetMetaDataL(TDes& aTitle,TDes& aAlbum,TDes& aArtist,TDes& aGenre,CMdaAudioPlayerUtility& aUtility)
	{
	TInt MDNumEntries(0);
	User::LeaveIfError(aUtility.GetNumberOfMetaDataEntries(MDNumEntries));
 
	for ( TInt i(0); i < MDNumEntries; ++i )
		{
		CMMFMetaDataEntry* entry(NULL);
		TRAPD(error, entry = aUtility.GetMetaDataEntryL(i));
		CleanupStack::PushL(entry);
 
		if (error == KErrNone)
			{
			if (entry->Name().CompareF(KMMFMetaEntrySongTitle) == KErrNone)
				{		
				aTitle.Copy(entry->Value());
				}
			else if (entry->Name().CompareF(KMMFMetaEntryAlbum) == KErrNone)
				{
				aAlbum.Copy(entry->Value());
				}
			else if (entry->Name().CompareF(KMMFMetaEntryArtist) == KErrNone)
				{
				aArtist.Copy(entry->Value());
				}
			else if (entry->Name().CompareF(KMMFMetaEntryGenre) == KErrNone)
				{
				aGenre.Copy(entry->Value());
				}
			}
 
		CleanupStack::PopAndDestroy(entry);
		}
	}