On 01/24/2012 05:16 PM, Devin Heitmueller wrote:
On Tue, Jan 24, 2012 at 9:58 AM, Antti Palosaari<crope@xxxxxx> wrote:
So what was the actual benefit then just introduce one way more to implement
same thing. As I sometime understood from Manu's talk there will not be
difference if my device is based of DVB-T + DVB-C demod combination or just
single chip that does same. Now there is devices that have same
characteristics but different interface.
For one thing, you cannot use DVB-T and DVB-C at the same time if
they're on the same demod. With many of the devices that have S/S2
and DVB-T, you can be using them both in parallel. Having multiple
frontends actually makes sense since you don't want two applications
talking to the same frontend at the same time but operating on
different tuners/streams.
For the demods that are not shared (like tuner shared) we register own
frontend under own adapter. I don't see that is going to change. It have
been ages as it is and I have not seen none have said it is needed to
change.
That said, there could be opportunities for consolidation if the
demods could not be used in parallel, but I believe that would require
a nontrivial restructuring of the core code and API. In my opinion
the entry point for the kernel ABI should *never* have been the
demodulator but rather the bridge driver (where you can exercise
greater control over what can be used in parallel).
Under the current situation I see it is better to select only one
method. As it is now single frontend then it is just needed to make
"virtual" frontend that combines multiple frontends as single and offers
it through API.
And one thing I would like to mention, frontend is just logical entity
that represent DigitalTV hardware. It is rather much mapped as hardware
point of view to demod driver callbacks but it is not needed :)
regards
Antti
--
http://palosaari.fi/
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