Hello > The basic idea is that we have two chips. One is custom FPGA, where all > the > physical inputs and outpusts are connected. The second chip is the emu10k > which is conected to FPGA by a bunch of 32bit buses. There are 32 buses > from > emu10k to FPGA called DSP0 to DSP31 used for playback and 21 buses in > other > direction called DSP0 to DSP15 (hexa numbering!) used for capture. 1 bus = > one audio channel except for higher sample rates (e.g. 96kHz and 192kHz), > where multiple buses are used to transfer one channel. The FPGA can assign > any physical input (or playback DSP channel) to any capture DSP channel > and > same for outputs (see alsamixer). The multichannel capture on hw:0,2 > captures > the first 16 channels (DSP0 to DSPD). The multichannel playback on hw:0,3 > is > routed to DSP0 to DSP15. > I hope it helps. That is more or less what I had figured out, but it how are playback_1 to _16 channels routed to DSP0-15? It seems that it depends on the setting of Front, Surround, LFE, etc. mixer controls. If they are turned up, I don't understand what happens, sound to playback channels appears on various DSP buses, at different levels. If I turn the Front/Surround/LFE/etc. faders down, I can mix playback channels to DSP using the "Multichannel PCM Send/Routing/Volume" faders, in a more or less intuitive way, besides that routing values do not map directly to DSP buses (i.e. 14-15 map to DSP0-1, but 2-3 map to DSP2-3). There is also a set of mixer controls called "EMU10k Routing", or similar, which I haven't even looked at. > > > or maybe the driver developer can help me out? > > Well, I'm not quite a driver developer, but I think I know E-mu cards well > to > answer any questions important for mixer appliacation ;) So please ask. > I'd > like to help you to imporve alsa suport for these excellent cards. > > Best Regards, > > Ctirad > > Thanks for your help, and sorry everyone for double-posting Camilo _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
