Re: [linux-dvb] Re: DVB-S on quad TV tuner card from Medion PC MD8800
Hartmut Hackmann wrote: Hi, Michael Krufky wrote: Hartmut Hackmann wrote: There is a driver for the DVB-S channel decoder of this card available now. The problem is: how to select the frontends. Hello Hartmut, I changed the list cc from v4l to dvb, as that would be more appropriate. I'm just curious... Will saa713x with multiple frontends be able to use both frontends at once? Or just one at a time? (I would assume the latter) In the case of the cx2388x cards, Hauppauge has an HVR3000 card that has both DVB-T and DVB-S demods on it. Only one can be used at a time, as they would share a single transport to move the ts data. Steve Toth has been working on the 8802-mpeg port functionality of the cx88 driver, and he has created this device_acquire method, that allows the driver to select which frontend has access to a bus at any given moment. You might want to take a look at his tree for ideas: http://linuxtv.org/hg/~stoth/hvr1300-final?cmd=changeset;node=4b846f1d939b;style=gitweb This tree doesnt yet deal with multiple DVB frontends, but it does deal with MPEG Encoder vs. DVB-T demod. I believe the multiple frontend support is coming next, but I havent asked him about that. Of course, if the saa713x will allow both demods to function simultaneously, then the suggestion above will not apply at all. I'm just shooting ideas around, and asking for my curiousity... Dont feel pressured to act on this immediately. ;-) Thanks that you pointed me to this, i will have a look. Your assumption is right, the saa173x have only 1 TS interface, so both decoders can't be active simultanously. The easiest solution is to select the demodulator with an insmod option, it can be done with a very simple hack. I've been working on some generic patches for the cx88 and saa7134 drivers to add support for multiple frontends on a single adapter. Specifically, I'm defining some generic videobuf_dvb_X structures which move the struct videobuf_dvb member from the cx8802_dev and (saa7134_dev?) core structures down into a list with some other elements. (This can be extended for multiple adapters multiple frontends) I'm also changing the dvb_register functions. Instead of calling videobuf_dvb_register (which implicitly creates a single adapter with a single frontend), I'm calling a new function videobuf_dvb_register_bus which registers a single adapter and any number of frontends. Based on replies to my earlier question, my feeling is that cx88 boards are a single adapter with multiple frontends. Other bridges could be multiple adapters and multiple frontends (MD8800). The saa7134 framework will also need it's own version of cx88_hw_bus_ctrl() and will need to override feops.hw_bus_ctrl to ensure all the frontends call and try to determine whether access is available. This mechanism stops two different frontends from trying to access/configure the same hardware. I'm _NOT_ working on these patches. The cx88 framework is a good reference for this. The patches are done but I need to test. If everything goes well I'll post the patches fore review later this week. Steve ___ linux-dvb mailing list linux-dvb@linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
[linux-dvb] Re: DVB-S on quad TV tuner card from Medion PC MD8800
Hartmut Hackmann wrote: There is a driver for the DVB-S channel decoder of this card available now. The problem is: how to select the frontends. Hello Hartmut, I changed the list cc from v4l to dvb, as that would be more appropriate. I'm just curious... Will saa713x with multiple frontends be able to use both frontends at once? Or just one at a time? (I would assume the latter) In the case of the cx2388x cards, Hauppauge has an HVR3000 card that has both DVB-T and DVB-S demods on it. Only one can be used at a time, as they would share a single transport to move the ts data. Steve Toth has been working on the 8802-mpeg port functionality of the cx88 driver, and he has created this device_acquire method, that allows the driver to select which frontend has access to a bus at any given moment. You might want to take a look at his tree for ideas: http://linuxtv.org/hg/~stoth/hvr1300-final?cmd=changeset;node=4b846f1d939b;style=gitweb This tree doesnt yet deal with multiple DVB frontends, but it does deal with MPEG Encoder vs. DVB-T demod. I believe the multiple frontend support is coming next, but I havent asked him about that. Of course, if the saa713x will allow both demods to function simultaneously, then the suggestion above will not apply at all. I'm just shooting ideas around, and asking for my curiousity... Dont feel pressured to act on this immediately. ;-) -Mike ___ linux-dvb mailing list linux-dvb@linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
Re: [linux-dvb] Re: DVB-S on quad TV tuner card from Medion PC MD8800
Hi, Michael Krufky wrote: Hartmut Hackmann wrote: There is a driver for the DVB-S channel decoder of this card available now. The problem is: how to select the frontends. Hello Hartmut, I changed the list cc from v4l to dvb, as that would be more appropriate. I'm just curious... Will saa713x with multiple frontends be able to use both frontends at once? Or just one at a time? (I would assume the latter) In the case of the cx2388x cards, Hauppauge has an HVR3000 card that has both DVB-T and DVB-S demods on it. Only one can be used at a time, as they would share a single transport to move the ts data. Steve Toth has been working on the 8802-mpeg port functionality of the cx88 driver, and he has created this device_acquire method, that allows the driver to select which frontend has access to a bus at any given moment. You might want to take a look at his tree for ideas: http://linuxtv.org/hg/~stoth/hvr1300-final?cmd=changeset;node=4b846f1d939b;style=gitweb This tree doesnt yet deal with multiple DVB frontends, but it does deal with MPEG Encoder vs. DVB-T demod. I believe the multiple frontend support is coming next, but I havent asked him about that. Of course, if the saa713x will allow both demods to function simultaneously, then the suggestion above will not apply at all. I'm just shooting ideas around, and asking for my curiousity... Dont feel pressured to act on this immediately. ;-) Thanks that you pointed me to this, i will have a look. Your assumption is right, the saa173x have only 1 TS interface, so both decoders can't be active simultanously. The easiest solution is to select the demodulator with an insmod option, it can be done with a very simple hack. Best regards Hartmut ___ linux-dvb mailing list linux-dvb@linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
Re: [linux-dvb] Re: DVB-S on quad TV tuner card from Medion PC MD8800
In the case of the cx2388x cards, Hauppauge has an HVR3000 card that has both DVB-T and DVB-S demods on it. Only one can be used at a time, as they would share a single transport to move the ts data. Steve Toth has been working on the 8802-mpeg port functionality of the cx88 driver, and he has created this device_acquire method, that allows the driver to select which frontend has access to a bus at any given moment. You might want to take a look at his tree for ideas: http://linuxtv.org/hg/~stoth/hvr1300-final?cmd=changeset;node=4b846f1d939b;style=gitweb This tree doesnt yet deal with multiple DVB frontends, but it does deal with MPEG Encoder vs. DVB-T demod. I believe the multiple frontend support is coming next, but I havent asked him about that. I'm going to do the HVR3000 patch tonight, showing multiple demods on a single bus. FYI Steve ___ linux-dvb mailing list linux-dvb@linuxtv.org http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
