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| author | Wim Taymans <wim.taymans@gmail.com> | 2004-06-08 11:47:35 +0000 |
|---|---|---|
| committer | Wim Taymans <wim.taymans@gmail.com> | 2004-06-08 11:47:35 +0000 |
| commit | 37d98c27b93ec62742df3b723bd3fa50695f78a2 (patch) | |
| tree | 63a090ff7dd4825abad1987cc870b95514b167f2 /ext/jpeg/README | |
| parent | e232b09d5040289895c078e98947648688488e84 (diff) | |
ext/jpeg/: Added a new simple jpeg based codec
Original commit message from CVS:
* ext/jpeg/Makefile.am:
* ext/jpeg/README:
* ext/jpeg/gstjpeg.c: (plugin_init):
* ext/jpeg/gstsmokedec.c: (gst_smokedec_get_type),
(gst_smokedec_base_init), (gst_smokedec_class_init),
(gst_smokedec_init), (gst_smokedec_link), (gst_smokedec_chain):
* ext/jpeg/gstsmokedec.h:
* ext/jpeg/gstsmokeenc.c: (gst_smokeenc_get_type),
(gst_smokeenc_base_init), (gst_smokeenc_class_init),
(gst_smokeenc_init), (gst_smokeenc_getcaps), (gst_smokeenc_link),
(gst_smokeenc_resync), (gst_smokeenc_chain),
(gst_smokeenc_set_property), (gst_smokeenc_get_property):
* ext/jpeg/gstsmokeenc.h:
* ext/jpeg/smokecodec.c: (smokecodec_init_destination),
(smokecodec_flush_destination), (smokecodec_term_destination),
(smokecodec_init_source), (smokecodec_fill_input_buffer),
(smokecodec_skip_input_data), (smokecodec_resync_to_restart),
(smokecodec_term_source), (smokecodec_encode_new),
(smokecodec_decode_new), (smokecodec_info_free),
(smokecodec_set_quality), (smokecodec_get_quality),
(smokecodec_set_threshold), (smokecodec_get_threshold),
(smokecodec_set_bitrate), (smokecodec_get_bitrate),
(find_best_size), (abs_diff), (put), (smokecodec_encode),
(smokecodec_parse_header), (smokecodec_decode):
* ext/jpeg/smokecodec.h:
Added a new simple jpeg based codec
Diffstat (limited to 'ext/jpeg/README')
| -rw-r--r-- | ext/jpeg/README | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/ext/jpeg/README b/ext/jpeg/README new file mode 100644 index 00000000..ffa1d0c0 --- /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 |