[linux-dvb] S2API - First release

Hans Werner HWerner4 at gmx.de
Thu Sep 4 18:07:56 CEST 2008

> Hello,
> It's been a crazy few days, please forgive my short absence.
> What have I been doing? Well, rather than spending time discussing a new 
> S2API on the mailing list, I wanted to actually produce a working series 
> of patches that kernel and application developers could begin to test.

Great, that's good to hear :) .

> In addition, here's is a userland application that demonstrates tuning 
> the current DVB-S/T/C and US ATSC modulations types using the new API. 
> (www.steventoth.net/linux/s2/tune-v0.0.1.tgz)
> A tuning demo app? What? Obviously, tuning older modulation types via 
> the new API isn't a requirements, but it's a useful validation exercise 
> for the new S2API. What _IS_ important is..... that it also demonstrates 
> using the same tuning mechanism to tune DVB-S2 8PSK / NBC-QPSK 
> modulation types, and also has rudimentary ISDB-T support for any 
> developers specifically interested.
> This S2API tree also contains support for the cx24116 demodulator 
> driver, and the Hauppauge HVR4000 family of S2 products. So those 
> interested testers/developers can modify the tune.c app demo and make 
> changes specific to their area, and try experimenting with the new API 
> if they desire. [1]

Even better!
> Obviously, tune.c isn't intelligent, it's not a replacement for szap, 
> tzap or whatever - it's simply a standalone S2API test tool, that 
> demonstrates the important API interface.

> If anyone is willing to pull the tree and begin testing with the tune.c 
> app then please post all feedback on this thread. [2]

I will test it with the HVR4000.

Looking at the code in dvb_frontend.c I think TV_SET_TONE and TV_SET_VOLTAGE don't do
anything. Or am I missing something?


Release early, release often.

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