[linux-dvb] [PATCH] tda1004x driver has code to support HIERARCHY_AUTO, but does not set FE_CAN_HIERARCHY_AUTO

Patrick Boettcher patrick.boettcher at desy.de
Tue Sep 18 17:33:43 CEST 2007


On Tue, 18 Sep 2007, Wolfgang Wegner wrote:

> Hi Patrick,
> 
> On Tue, Sep 18, 2007 at 04:36:33PM +0200, Patrick Boettcher wrote:
> > Hi Simon,
> > 
> > And even if they would be hierarchically transmitted, it would not be 
> > possible to receive them: The LinuxTV API as of today is not capable of 
> > selecting either the high-priority stream or the low-priority one - there 
> > is simply no field to select it. All it could say is whether there is 
> > hierarchy used or not.
> 
> just a stupid question:
> How is a frontend supposed to handle that anyways?
> The demods I know about only have one transport stream output,
> how are high and low priority data separated?
> (I was thinking it would have to be done by PID on a packet-by-packet
> base, so it would transparent to the demux layer, but I did not find
> an application really using hierarchical transmission yet.)

Each stream is a "standalone" MPEG2 transport stream. So if hierarchy is 
used, the user has to select the stream he wants.

Patrick.

--
  Mail: patrick.boettcher at desy.de
  WWW:  http://www.wi-bw.tfh-wildau.de/~pboettch/



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