[mythtv] [mythtv-commits] Ticket #4924: Support for toggle power / PACE550 in 6200ch channel changer

Daniel Kristjansson danielk at cuymedia.net
Wed Mar 19 13:08:22 UTC 2008


On Tue, 2008-03-18 at 23:00 -0400, Steven Adeff wrote:
> On Tue, Mar 18, 2008 at 6:51 PM, MythTV <mythtv at cvs.mythtv.org> wrote:
> > #4924: Support for toggle power / PACE550 in 6200ch channel changer
> >  -------------------------------------+--------------------------------------
> >
> >  Reporter:  bmayland at leoninedev,com  |        Owner:  danielk
> >      Type:  enhancement              |       Status:  assigned
> >
> >  Priority:  minor                    |    Milestone:  unknown
> >  Component:  contrib                  |      Version:  head
> >
> >  Severity:  low                      |   Resolution:
> >   Mlocked:  0                        |
> >  -------------------------------------+--------------------------------------
> >
> >  Comment(by danielk):
> >
> >   (In [16683]) Refs #4924. Constructs 6200 channel changing command message
> >   using the standard AVC command defines in avc1394.h; CTL_CMD0 value is
> >   unchanged.
> 
> Gentlemen,
> 
>  In terms a laymen like myself can understand... how does this method
> differ from the previous method?

The AVC command was constructed by or'ing together some constants that
we didn't know the meaning of because they weren't defined in avc1394.h
at the time. Now the avc1394 have added those constants and given them
names that match the standards documents so we now use it's defines for
those constants.

The same command is constructed, it is just self documenting now. So if
someone is trying to add another piece of hardware to the supported list
they can more easily tweak the existing command, and it allows us to
more easily detect two 1394 AVC channel changers using the same set of
commands and merge them.

-- Daniel



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