[gstreamer-bugs] [Bug 437457] saving relocations for GstElementDetails

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gstreamer (core) | Ver: HEAD CVS




------- Comment #10 from Stefan Kost (gstreamer, gtkdoc dev)  2007-06-22 10:02 UTC -------
@Jan, its quick tricky: Here is what happens:

libgstaudiodelay is a plugin with one element, that had the global static const
GstElementDetails (before). Next I moved it as a local var into _base_init().
Then I removed static and finally I used the
gst_element_class_set_details_simple().

These are the binary sizes:

51029 libgstaudiodelay.before.so*
51035 libgstaudiodelay.local-nonstatic.so*
51035 libgstaudiodelay.local.so*
50972 libgstaudiodelay.simple.so*

> readelf -d libgstaudiodelay.before.so | grep REL
 0x00000002 (PLTRELSZ)                   320 (bytes)
 0x00000012 (RELSZ)                      200 (bytes)
 0x6ffffffa (RELCOUNT)                   21

> readelf -d libgstaudiodelay.local.so | grep REL
 0x00000002 (PLTRELSZ)                   320 (bytes)
 0x00000012 (RELSZ)                      200 (bytes)
 0x6ffffffa (RELCOUNT)                   21

> readelf -d libgstaudiodelay.local-nonstatic.so | grep REL
 0x00000002 (PLTRELSZ)                   320 (bytes)
 0x00000012 (RELSZ)                      200 (bytes)
 0x6ffffffa (RELCOUNT)                   21

> readelf -d libgstaudiodelay.simple.so | grep REL
 0x00000002 (PLTRELSZ)                   320 (bytes)
 0x00000012 (RELSZ)                      168 (bytes)
 0x6ffffffa (RELCOUNT)                   17

Some of the savings in file-size are because now there is no code to initialize
the struct and only a little more code for the function call. The savings of
reloc-entries is because the struct contains pointers to strings which need to
be relocated. It the struct would only contain constant numbers (like a bitrate
table) it would be fine.


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