gstreamer/ext/jpeg
Seungha Yang 2c69544d0c jpegdec: Fix crash when interlaced field height is not DCT block size aligned
In case of interlaced JPEG file, we are doubling stride.
The scratch scan line should take account of it as well.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-good/-/merge_requests/1042>
2021-09-07 12:15:34 +00:00
..
gstjpeg.c jpeg: allow per feature registration 2021-03-29 12:45:21 +02:00
gstjpeg.h Fix FSF address 2012-11-04 00:07:18 +00:00
gstjpegdec.c jpegdec: Fix crash when interlaced field height is not DCT block size aligned 2021-09-07 12:15:34 +00:00
gstjpegdec.h jpegdec: don't overwrite the last valid line 2019-11-10 11:24:40 +01:00
gstjpegelements.h jpeg: allow per feature registration 2021-03-29 12:45:21 +02:00
gstjpegenc.c jpegenc: Remove arbitrary encoding size limitation 2021-06-02 13:28:18 -04:00
gstjpegenc.h jpegenc: add snapshot property 2018-01-31 17:51:16 +00:00
gstjpegplugin.c jpeg: allow per feature registration 2021-03-29 12:45:21 +02:00
gstsmokedec.c jpeg: allow per feature registration 2021-03-29 12:45:21 +02:00
gstsmokedec.h Fix FSF address 2012-11-04 00:07:18 +00:00
gstsmokeenc.c jpeg: allow per feature registration 2021-03-29 12:45:21 +02:00
gstsmokeenc.h Fix FSF address 2012-11-04 00:07:18 +00:00
meson.build jpeg: Add support for meson fallback 2021-08-04 01:43:29 +09:00
README ext/jpeg/: Added a new simple jpeg based codec 2004-06-08 11:47:35 +00:00
smokecodec.c Fix FSF address 2012-11-04 00:07:18 +00:00
smokecodec.h Fix FSF address 2012-11-04 00:07:18 +00:00
smokeformat.h Fix FSF address 2012-11-04 00:07:18 +00:00

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