[vdr] Re: VDR developer version 1.1.6

[Andreas Schultz <aschultz@cs.uni-magdeburg.de>]

On Monday 05 August 2002 19:27, Klaus Schmidinger wrote:
> Andreas Schultz wrote:
> > ...
> >
> > > This would mean that the player has to ensure that it always sends an
> > > entire frame, which I wouldn't want to make a requirement.
> >
> > Actually that has nothing to do with entire frames. Its just a mechanism
> > to tell the Player wether it can send new data blocks or not.
>
> You wrote:
> > The semantics for PlayVideo I would prefer is:
> >
> > class cDevice {
> >    ...
> > public:
> >     void PlayVideo(uint8_t buf, int length);
> >     int ProcessBuffer();
> >    ...
> > };
> >
> > PlayVideo(...) will take the entire buffer and store a pointer to it
> > internaly ProcessBuffer(...) will send as much data as possible to the
> > device, return
> >
> > values:
> >   > 0 mean there is still data in the buffer
> >
> >   < 0 mean there is still data left, but the device is busy at the moment
> > - try again
> >    0 means all data has been written to the card,
> >
> > values > 0 do not have to represent the actual amount of data beeing
> > written
>
> So, if I understand this correctly, the player would call PlayVideo() with
> a given buffer and the device would then process parts of the data in that
> buffer with every call to ProcessBuffer(). Only after ProcessBuffer()
> returns '0' would the player offer the next chunk of data to the device.
>
> Now let's assume the first chunk of data is, for reasons not known, only 10
> bytes in size. I pretty much assume that your device couldn't make much of
> this data, so it probably can't return '0' because it didn't process the
> entire data. So the player just sits there, calling ProcessBuffer()
> infinitely...

Nope, it would have to copy the data into an internal buffer. Normaly i would 
assume, that this situation would be an exeption rather than normality.

Andreas

-- 
Andreas Schultz <aschultz@cs.uni-magdeburg.de>
Student of computer science

"In accordance with plans for Linux OS world domination
      infiltration of governments is vital (:-))."