Re: Adding new metadata
- From: Lionel Landwerlin <lionel g landwerlin linux intel com>
- To: grilo-list gnome org
- Subject: Re: Adding new metadata
- Date: Fri, 11 Mar 2011 13:26:36 +0000
On Fri, 2011-03-11 at 14:01 +0100, Juan A. Suárez Romero wrote:
> On Thu, 2011-03-10 at 18:15 +0000, Lionel Landwerlin wrote:
> > Hi all,
> > I would like to add some new metadata key mostly to handle some EXIF
> > property available on pictures. Here is the list of what I would like to
> > support :
> > - camera model
> > - original resolution
> > - date taken
> > - orientation
> > - flash usage
> > - exposure time
> > - original size (XResolution/YResolution)
> > Some of these properties are quite specific. How would you like to see
> > them appear in Grilo ? :
> > - exposed in the core as well as already available properties ?
> > - private to one plugin ?
> Being EXIF properties, and thus a standard, I would add them to core. I
> don't see them specific to a plugin, but useful for any plugin that can
> return photos (like Flickr).
In the end, do we want a particular prefix for these keys ?
> > In the second case, how should the corresponding value be retrieved ?
> > Calling grl_media_source_metadata () with keys parameter being NULL ?
> If you know the key name (let's say "camera-model"), you can ask the
> register for the key, and then use it in source_metadata() function.
> GrlKeyID camera_model = grl_plugin_registry_lookup_metadata_key
> (registry, "camera-model");
> GList *ask_keys = grl_metadata_key_list_new (GRL_METADATA_KEY_TITLE,
> GRL_METADATA_KEY_AUTHOR, camera_model, NULL);
> metadata_key(source, ..., ask_keys, ...);
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