On 02/06/2013 12:47 PM, Samuel Mimram wrote: > Hi Rob, > > Right now we are in "freeze" period in order to fix the last bugs > before releasing, but nothing prevents us from starting a branch for > next version :) Multichannel is definitely doable and Liq already > supports more than two channels, so it's just a matter of plugging > things right. However, I'd like some more details about how you plan > to use it in order to think of a right design for multichannel. What > kind of application do you have in mind? Do you plan to mux stereo > streams together or have mutichannel files all the way long? Do you > have an idea about how you would like to specify mapping of channels?
ok so i guess my needs are quite specific, but i bet a subsection of people working with multichannel streams will be sound/media artists who would work in similar way: <! -- the next few paragraphs can be skipped the specific project i am trying to reimplement in liquidsoap streams all the classical music radiostations from euro simultaneously and mixes them down to a stereo pair, or in the case of a sound installation version to 8 or more speakers. i do this now using python to script together a whole bunch of mplayer instances into ecasound then to jack then to liquidsoap using a modified input.mplayer i can now get the streams into liquidsoap which makes things alot easier... but if i could assign these streams to 8 channels for example that would mean that in the installation i dont need to have a running instance of the scripts but can simply point mplayer to a the multichannel stream and output them to a multichannel sound card. --> not sure how to map the stereo into the 8channel array in this context so lets just thing about mono streams for now excuse makeyupy psudo code syntax: inputa = opus_channel(sine(40),0) inputb = opus_channel(sine(140),1) inputc = opus_channel(sine(240),2) inputd = opus_channel(sine(340),3) inpute = opus_channel(sine(440),4) inputf = opus_channel(sine(540),5) inputg = opus_channel(sine(640),6) inputh = opus_channel(sine(740),7) i guess you could also have a width parameter or something that determines how much bleed there will be to the left and right of the target channel, with 0 being only from that channel and 1 being coming from all channels inputa = opus_channel(sine(40),0,0) = only from speaker one inputa = opus_channel(sine(40),0,1) = from all speakers maybe another parameter for how much of the signal goes to a .1 sub channel but this could be done manually easily enough without a specific summing parameter. there are plenty of spatialisation things to look at for ideas in csound and supercollider for example but, ok so there are people way more qualified than me to talk about surround mapping algorithms for sure :) personally i only ever really used vector based amplitude panning in puredata http://impala.utopia.free.fr/pd/patchs/selection/EFFETS/vabp/vbap.html http://www.acoustics.hut.fi/software/vbap/ but a simple mono signal -> discrete channel mapping possibility would be great for starters - then on the client end they can be dealt with as desired my 2c rob > Cheers, > > Samuel. > > On Wed, Feb 6, 2013 at 11:29 AM, Rob Canning <r...@spc.org> wrote: >> i am very proud :) >> last night i built a new ubuntu 12.10 vserver and pulled down latest >> liquidsoap sources from git and compiled it with all plugins enabled - >> blow by blow account to those unfortunate enough to lurk in #savonet - >> next i had to compile an icecast 2.4-beta streaming server >> and now i have it! an opus stream >> very exciting sine() :) >> http://stream.kiben.net:8800/opus.ogg >> >> ok what i would really really *really* love would be multichannel >> encoding support from liquidsoap :) >> >> i know i shouldnt be greedy but... is it on the roadmap at all? >> >> is there anything i can do to help this along? >> >> rob >> >> ------------------------------------------------------------------------------ >> Free Next-Gen Firewall Hardware Offer >> Buy your Sophos next-gen firewall before the end March 2013 >> and get the hardware for free! Learn more. >> http://p.sf.net/sfu/sophos-d2d-feb >> _______________________________________________ >> Savonet-users mailing list >> Savonet-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/savonet-users ------------------------------------------------------------------------------ Free Next-Gen Firewall Hardware Offer Buy your Sophos next-gen firewall before the end March 2013 and get the hardware for free! Learn more. http://p.sf.net/sfu/sophos-d2d-feb _______________________________________________ Savonet-users mailing list Savonet-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/savonet-users
