[linux-dvb] [PATCH] add DVB-S2 support to frontend.h

Rudy Zijlstra rudy at edsons.demon.nl
Wed Mar 1 11:00:58 CET 2006


Marcel Siegert wrote:

>>>+/*! describes the available modulation types. */
>>>+enum dvb_fe_modulation {
>>>+	DVB_FE_MOD_QPSK		= (1 << 0),
>>>+	DVB_FE_MOD_QAM_16	= (1 << 1),
>>>+	DVB_FE_MOD_QAM_32	= (1 << 2),
>>>+	DVB_FE_MOD_QAM_64	= (1 << 3),
>>>+	DVB_FE_MOD_QAM_128	= (1 << 4),
>>>+	DVB_FE_MOD_QAM_256	= (1 << 5),
>>>+	DVB_FE_MOD_QAM_AUTO	= (1 << 6),
>>>+	DVB_FE_MOD_2_VSB	= (1 << 7),
>>>+	DVB_FE_MOD_4_VSB	= (1 << 8),
>>>+	DVB_FE_MOD_8_VSB	= (1 << 9),
>>>+	DVB_FE_MOD_16_VSB	= (1 << 10),
>>>+	DVB_FE_MOD_8_PSK	= (1 << 11),
>>>+	DVB_FE_MOD_BPSK		= (1 << 12),
>>>+	DVB_FE_MOD_MOD_UNKNOWN	= (1 << 31)
>>>+};
>>>  
>>>      
>>>
>>We might need the higher order modulations too, 16APSK and 32APSK, 
>>supported by the various chipsets.
>>
>>    
>>
>added to my patch, thanks for notification.
>
>still waiting for more comments, if nothin will arrive, i'll ask johannes to ACK 
>and if acked mauro to pull.
>
>regards
>marcel
>  
>
A remark. There is a bit of a push from Cable operators to add QAM_512 
and QAM_1024. Technically these are possible to build (though rather 
expensive at the moment), but the succesfull counter argument so far, is 
that none of them have a plant that can support it (or will support it 
in the upcoming years).

When you are redesigning the API, it might be interesting to take this 
into account.

R.



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