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gstreamer/ext/jpeg
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Sebastian Dröge 4358811258 Add a few libjpeg suppressions and initialize a variable to make smokeenc valgrind clean. Fixes bug #515701. 
Original commit message from CVS:
* ext/jpeg/gstsmokeenc.c: (gst_smokeenc_chain):
* tests/check/Makefile.am:
* tests/check/gst-plugins-good.supp:
Add a few libjpeg suppressions and initialize a variable to
make smokeenc valgrind clean. Fixes bug #515701.
2008-02-12 05:14:16 +00:00
..
gstjpeg.c docs/plugins/: Added smoke and jpeg to the docs. 2006-03-03 15:50:40 +00:00
gstjpegdec.c ext/jpeg/gstjpegdec.c: Actually drop the buffers which are outside the currently configured segment instead of just e... 2007-12-16 23:43:46 +00:00
gstjpegdec.h ext/jpeg/gstjpegdec.*: API: Added IDCT method property 2006-06-09 17:12:52 +00:00
gstjpegenc.c Fix build against core CVS. 2007-07-11 22:31:06 +00:00
gstjpegenc.h Fix more gobject macros: obj<->klass, GstXXX<->GstXXXClass 2006-06-01 21:07:26 +00:00
gstsmokedec.c ext/jpeg/: Various cleanups, capsnego and leak fixes. 2006-10-30 09:24:53 +00:00
gstsmokedec.h Fix more gobject macros: obj<->klass, GstXXX<->GstXXXClass 2006-06-01 21:07:26 +00:00
gstsmokeenc.c Add a few libjpeg suppressions and initialize a variable to make smokeenc valgrind clean. Fixes bug #515701. 2008-02-12 05:14:16 +00:00
gstsmokeenc.h ext/jpeg/gstsmokeenc.*: Remove stupidity in get/set caps functions. 2007-07-06 14:35:59 +00:00
Makefile.am Fix build with LDFLAGS='-Wl,-z,defs' (#410997) 2007-02-24 22:57:49 +00:00
README ext/jpeg/: Added a new simple jpeg based codec 2004-06-08 11:47:35 +00:00
smokecodec.c ext/jpeg/: These libjpeg callbacks should return a 'boolean' (unsigned char apparently) and not a 'gboolean' (which m... 2007-01-08 12:45:10 +00:00
smokecodec.h docs/plugins/: Added smoke and jpeg to the docs. 2006-03-03 15:50:40 +00:00
smokeformat.h expand tabs 2005-12-06 19:44:58 +00:00

README 

The Smoke Codec
---------------

This is a very simple compression algorithm I was toying with when doing a
Java based player. Decoding a JPEG in Java has acceptable speed so this codec
tries to exploit that feature. The algorithm first compares the last and the 
new image and finds all 16x16 blocks that have a squared difference bigger than
a configurable threshold. Then all these blocks are compressed into an NxM JPEG.
The quality of the JPEG is inversely proportional to the number of blocks, this
way, the picture quality degrades with heavy motion scenes but the bitrate stays
more or less constant.
Decoding decompresses the JPEG and then updates the old picture with the new
blocks.


TODO:
----
- make format extensible
- motion vectors
- do some real bitrate control