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How to determine movie type ?

Hello,

In my application, I need to display information about files handled by QuickTime. For still images, I use GraphicsImporter and ImageDescription and this works fine.

For video and sound files, I know that a file can contain several tracks. So I use GetMovieIndTrackType with VideoMediaType, MPEGMediaType, FlashMediaType, SoundMediaType, etc... and this allows me to know if a file contains video or/and sound data but I don't know how to make the difference between, for instance, a MP3 and an AIFF file or a MOV and an AVI file.

I try to get the codec (with GetMediaSampleDescription) but this is not clear : for instance, I get a CinePack codec for an AVI file but this does not mean this is an AVI, I suppose. For MP3 files, I get an unknown codec type (0x6D730055 in hexa), for Wave file, I get a 'raw ' codec... This is a bit messy to me.

Can I rely on the codec information ? Is it unique (I mean, does an MP3 always has the same codec) ? More generally, is there a recommended way to determine more precisely the type of a file that QuickTime can handle ?

Thanks for your help.


Eric Arlotti
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