[linux-dvb] Re: refactoring

[Holger Waechtler <holger@qanu.de>]

Gerd Knorr wrote:

> > > Well, unlike the application the kernel driver can stop the DMA in case
> > > there are no more empty buffers which are to fill with data ...
> > >      
> > Data would get lost in both cases, not?
> >    
> Yes.
>
> The difference is that if the driver stops the DMA it can:
>
>  - notify the app about that (both dvb + alsa return some error code,
>    with v4l2 you can see that by checking sequence numbers or
>    timestamps) and.
>  
You can check for data loss by looking on the Continuity Counter between 
packets.

>  - you don't have the risc that the data changes while you are
>    processing it because the ring buffer overflows ...
>  
this could get catched by checking the write pointer position after 
packet processing, not?

Holger