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docs/design/draft-tagreading.txt: Add some more thoughts.
Original commit message from CVS: * docs/design/draft-tagreading.txt: Add some more thoughts.
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@ -1,3 +1,8 @@
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2007-10-03 Stefan Kost <ensonic@users.sf.net>
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* docs/design/draft-tagreading.txt:
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Add some more thoughts.
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2007-10-03 Stefan Kost <ensonic@users.sf.net>
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* tests/check/pipelines/simple-launch-lines.c:
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@ -3,7 +3,7 @@ Tagreading
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The tagreading (metadata reading) use case for mediacenter applications is not
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to well supported by the current GStreamer architecture. It uses demuxers on the
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files, which generelly said takes too long. what we want is secialized elements
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files, which generelly said takes too long. what we want is specialized elements
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that just do the tag-reading.
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The idea is to have one plugin 'tagread' simmilar to 'typefind' that provides
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@ -13,6 +13,9 @@ would be that when building a metadatabase one only loads this plugin.
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Then there would be a tagbin, that similar to decodebin does a typefind and then
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plugs the right tagread element. It might plug a demuxer as a fallback solution.
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For optimal performance typefind and tagread could share the list of already
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peeked buffers.
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Still it would be nice to reuse code from demuxers/tag-filters.
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@ -38,15 +41,16 @@ The plan is that applications can do the following:
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Open Issues
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-----------
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* would it make sense to have 2-phase tag-reading
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* would it make sense to have 2-phase tag-reading (property on tagbin and/or
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tagread elements)
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* 1st phase: get tag-data that are directly embedded in the data
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* 2nd phase: get tag-data that has to be generated fetched
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* 2nd phase: get tag-data that has to be generated
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* e.g. album-art via web, video-thumbnails
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* what about caching backends
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* it would be good to allow applications to supply tagbin with a tagcache-
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object instance. whenever tagbin gets a uri to tagread, it consults the
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cache first. whenever there is a cache-miss it will tag-read and then store
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in the cache
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object instance. Whenever tagbin gets a 'location' to tagread, it consults
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the cache first. whenever there is a cache-miss it will tag-read and then
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store in the cache
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GstTagList *gst_tag_cache_load_tag_data (GstTagCache *self, const gchar *uri);
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gst_tag_cache_store_tag_data (GstTagCache *self, const gchar *uri, GstTagList *tags);
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