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gstreamer/ext/jpeg
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Tim-Philipp Müller 7e522c28c2 ext/jpeg/: Refuse sink caps in the encoder if width or height is not a multiple of 16, the encoder does not support t... 
Original commit message from CVS:
* ext/jpeg/gstsmokedec.c: (gst_smokedec_chain):
* ext/jpeg/gstsmokeenc.c: (gst_smokeenc_setcaps),
(gst_smokeenc_resync), (gst_smokeenc_chain):
Refuse sink caps in the encoder if width or height is not a
multiple of 16, the encoder does not support that yet; along the
same lines, check the return value of the encoder setup function;
also remove some debug log clutter.
2006-08-08 14:40:47 +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: After a failed buffer alloc, we need to abort the jpeg decoding (it started when parsing heade... 2006-06-18 14:00:19 +00:00
gstjpegdec.h ext/jpeg/gstjpegdec.*: API: Added IDCT method property 2006-06-09 17:12:52 +00:00
gstjpegenc.c Use GST_DEBUG_CATEGORY_STATIC where possible (#342503) plus two minor macro fixes. 2006-06-22 19:31:04 +00:00
gstjpegenc.h Fix more gobject macros: obj<->klass, GstXXX<->GstXXXClass 2006-06-01 21:07:26 +00:00
gstsmokedec.c ext/jpeg/: Refuse sink caps in the encoder if width or height is not a multiple of 16, the encoder does not support t... 2006-08-08 14:40:47 +00:00
gstsmokedec.h Fix more gobject macros: obj<->klass, GstXXX<->GstXXXClass 2006-06-01 21:07:26 +00:00
gstsmokeenc.c ext/jpeg/: Refuse sink caps in the encoder if width or height is not a multiple of 16, the encoder does not support t... 2006-08-08 14:40:47 +00:00
gstsmokeenc.h Fix more gobject macros: obj<->klass, GstXXX<->GstXXXClass 2006-06-01 21:07:26 +00:00
Makefile.am docs/plugins/: Added smoke and jpeg to the docs. 2006-03-03 15:50:40 +00:00
README ext/jpeg/: Added a new simple jpeg based codec 2004-06-08 11:47:35 +00:00
smokecodec.c ext\jpeg\smokecodec.c: use of GST_DEBUG instead of DEBUG(a...) for WIN32 2006-03-30 23:37:16 +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