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diff --git a/ext/jpeg/README b/ext/jpeg/README new file mode 100644 index 0000000..ffa1d0c --- /dev/null +++ b/ext/jpeg/README @@ -0,0 +1,20 @@ +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 |