mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-11-23 10:11:08 +00:00
20 lines
780 B
Text
20 lines
780 B
Text
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
|