Hello! I recently started to work on adding DVB-S2 support to the existing DVB Demux in Linux-DVB. With "DVB-S2 support" in the context of the demultiplexer I mean interfaces which allow to access DVB-S2 Base-band frames (BBFrames) and Generic Streams (Packetized and Continuous), as well as a software implementation which processes BBFrames and dispatches the data to different feeds (if not done by the card driver itself). What I did is to add a new feed type "struct dmx_bb_feed" in demux.h. Functions for allocating and releasing bb feeds were added to the Demux interface (struct dmx_demux) and are implemented by the DVB demux (dvbdmx_allocate_bb_feed and dvbdmx_release_bb_feed in dvb_demux.c,dvb_demux.h). A bb feed can be allocated for a specific ISI or for all ISIs. Currently the following modes are supported: + BB_FRAME Deliver full BBFrames (incl. header) to demux feed (default) + BB_PACK_GS Deliver Packetized Generic Stream to demux feed + BB_CONT_GS Deliver Continues Generic Stream to demux feed + BB_TS Deliver Transport Stream (if stream is using TS-Compatibility mode) to demux feed Although the DVB demux is very TS-specific (especially struct dvb_demux_feed) and dvb_demux.c is already very complex, some reasons why I put it there are: - Try avoid code duplication - Keep demux-stuff at one place - Try to add BB-Frame support with minimal changes - Can be used by existing drivers without much change I created a Mercurial repo for this project, which is available under http://www.cosy.sbg.ac.at/~cpraehaus/hg.cgi/bb-demux Currently, I'm testing the whole thing, especially the handling of packetized data. It will also soon be possible to feed TS packets received from DVB-S2 Base-band frames to the TS demultiplexer, which then in turn can reassemble sections, for example. Next step would be to extend the DVR device (), so that DVB-S2 "Base-band data" can be read in user-space. Cheers, Christian. -- Christian Praehauser <cpraehaus@xxxxxxxxxxxxxx> || //\\//\\ || Multimedia Communications Group, ||// \/ \\|| Department of Computer Sciences, University of Salzburg http://www.cosy.sbg.ac.at/~cpraehaus/ http://www.network-research.org/ http://www.uni-salzburg.at/ _______________________________________________ linux-dvb mailing list linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
