ruby-****@sourc*****
ruby-****@sourc*****
2004年 4月 1日 (木) 21:05:14 JST
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REMOTE_ADDR = 195.207.101.112
REMOTE_HOST =
URL = http://ruby-gnome2.sourceforge.jp/en/?tut-gst-types
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= GStreamer Types
+ {{link("tut-gst-mime-types", nil, "tut-gst", "tut-gst-threads")}}
GStreamer assigns a unique number to all registered MIME types. GStreamer also keeps a reference to a function that can be used to determine if a given buffer is of the given MIME type.
There is also an association between a MIME type and a file extension, but the use of typefind functions (similar to (({file(1)}))) is preferred.
The type information is maintained in a list of Gst::Type. All operations on Gst::Type occur via their ID numbers, which you can retrieve with Gst::Type#id. You can also get the file extensions handled with Gst::Type#exts and the MIME type with Gst::Type#mime.
== MIME Type Conversion
We can obtain a Gst::Type for a given MIME type with the following piece of code:
type = Gst::Type.find_by_mime("audio/mpeg")
This method will return nil if the type was not known.
== ID Conversion
We can obtain a Gst::Type for a given ID with the following piece of code:
type = Gst::Type.find_by_id(id)
This method will return nil if the id was not associated with any known Gst::Type.
== Extension Conversion
We can obtain the Gst::Type for a given file extension with the following piece of code:
type = Gst::Type.find_by_ext(".mp3")
This method will return nil if the type was not known.