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gstreamer/ext/jpeg
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Michael Smith 8667e55c83 ext/jpeg/: JPEG fractiony goodness. 
Original commit message from CVS:
* ext/jpeg/gstjpegdec.c: (gst_jpeg_dec_setcaps),
(gst_jpeg_dec_chain), (gst_jpeg_dec_change_state):
* ext/jpeg/gstjpegdec.h:
* ext/jpeg/gstjpegenc.c: (gst_jpegenc_setcaps):
* ext/jpeg/gstjpegenc.h:
* ext/jpeg/gstsmokeenc.c: (gst_smokeenc_setcaps),
(gst_smokeenc_resync):
* ext/jpeg/gstsmokeenc.h:
JPEG fractiony goodness.
2005-11-22 23:58:14 +00:00
..
gstjpeg.c rework configure.ac; make asterisk rtp stuff compile on mingw 2005-11-14 02:13:35 +00:00
gstjpegdec.c ext/jpeg/: JPEG fractiony goodness. 2005-11-22 23:58:14 +00:00
gstjpegdec.h ext/jpeg/: JPEG fractiony goodness. 2005-11-22 23:58:14 +00:00
gstjpegenc.c ext/jpeg/: JPEG fractiony goodness. 2005-11-22 23:58:14 +00:00
gstjpegenc.h ext/jpeg/: JPEG fractiony goodness. 2005-11-22 23:58:14 +00:00
gstsmokedec.c ext/jpeg/: Updated smoke, new bitstream, allows embedding in ogg. 2004-10-04 16:53:48 +00:00
gstsmokedec.h ext/jpeg/: Updated smoke, new bitstream, allows embedding in ogg. 2004-10-04 16:53:48 +00:00
gstsmokeenc.c ext/jpeg/: JPEG fractiony goodness. 2005-11-22 23:58:14 +00:00
gstsmokeenc.h ext/jpeg/: JPEG fractiony goodness. 2005-11-22 23:58:14 +00:00
Makefile.am fix build and use of GST_LIBS 2005-09-23 04:23:00 +00:00
README ext/jpeg/: Added a new simple jpeg based codec 2004-06-08 11:47:35 +00:00
smokecodec.c fix compiler warnings 2005-09-09 16:11:48 +00:00
smokecodec.h ext/jpeg/: Updated smoke, new bitstream, allows embedding in ogg. 2004-10-04 16:53:48 +00:00
smokeformat.h ext/jpeg/: Updated smoke, new bitstream, allows embedding in ogg. 2004-10-04 16:53:48 +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