[linux-dvb] S2API - First release

Steven Toth stoth at linuxtv.org
Fri Sep 5 15:18:46 CEST 2008


Hans Werner wrote:
>> 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?

My bad.

Pull again from ~stoth/s2, I fixed this last night and tested with a 
generator.

DVB-S is working fine. 8PSK and NBC-QPSK would also work - assuming you 
have the right tuning params (pilot etc).

- Steve



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