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gstreamer/subprojects/gst-plugins-good/ext/jpeg
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Marek Vasut c9e108378a jpegdec: Pull row_stride from GST_VIDEO_FRAME_PLANE_STRIDE() 
The libjpeg-turbo internal state might not be correctly initialized for
the first frame in a stream, pull the frame stride from gstreamer frame
metadata instead, which is correct even for the first frame, and which
makes this code consistent with the surrounding lines.

Fixes: e6d83d8f96 ("jpegdec: Support libjpeg-turbo colorspace conversion")
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1687>
2022-02-13 14:46:31 +01:00
..
gstjpeg.c
gstjpeg.h
gstjpegdec.c jpegdec: Pull row_stride from GST_VIDEO_FRAME_PLANE_STRIDE() 2022-02-13 14:46:31 +01:00
gstjpegdec.h
gstjpegelements.h
gstjpegenc.c
gstjpegenc.h
gstjpegplugin.c
gstsmokedec.c
gstsmokedec.h
gstsmokeenc.c
gstsmokeenc.h
meson.build
README
smokecodec.c
smokecodec.h
smokeformat.h

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