[MPlayer-cygwin] questions about ao_dsound

[Sascha Sommer]

On Monday 11 October 2004 09:04, Florian Dietrich wrote:
> Hey!
>
>  --- Sascha Sommer <saschasommer at freenet.de> wrote:
> > > should be sizeof(WAVEFORMATEXTENSIBLE)-sizeof(WAVEFORMATEX).
> >
> > I'm not 100% sure. While cbSize should be zero when WAVEFORMATEX is
> > used alone [...] says that it should be at least 22 for
> > WAVEFORMATEXTENSIBLE.
>
> right, zero when the extensions aren't used. When it's used then 22,
> since sizeof(WAVEFORMATEXTENSIBLE) is 40 and sizeof(WAVEFORMATEX) is
> 18 :-)

Ah GUID is a bit bigger than I thought...

> > That is an interesting question and there should still be a way to
> > swap the channels in an audio filter. However I think it is ok for
> > now to reorder them so that it works for ac3. We have to copy the
> > data anyway. Hopefully there won't be to much speed difference.
>
> Are the channels always interleaved the way that there's only one
> sample for each channel at a time? E.g. 123456123456123456... for
> 6-Channel Audio? Or are there multiple samples at a time
> (111222333444555666111...)?
> I'll write some code for it tomorrow if nothing important comes up. I
> really want 5.1 sound with mplayer! ;-)

No idea, but I thought they are interleaved.

> > I think it doesn't matter if  we do dynamic or static linking. The
> > current way has the advantage that MPlayer will at least startup on
> > systems without directx. I don't even know if there are such
> > systems, though.
>
> I don't think there are, but you're right, it's not that important.
>
> > > [buffer size]
> >
> > If you could improve this that would be great.
>
> Yep, I'll send a patch.
>

Thanks.

Sascha