[vlc-devel] Doubts on VLC audio handling

[Assim Deodia]

On Fri, Mar 20, 2009 at 8:09 PM, Kaarlo Räihä <agent_007 at luukku.com> wrote:

> Assim Deodia kirjoitti 20.03.2009 kello 10:29:
> > Hi All,
> >
> > I making a panning module for VLC as my final year project. I am having
> > following doubts regarding VLC audio handling.
> >
> > 1) In aout_filter_sys_t: I can see int's for every channel (i.e. i_left,
> > i_right etc) but not for LFE. does VLC handle in different way? I tried
> > adding i_lfe to the structure and also to output buffer, and played
> >  a 6ch
> > file. Still there was no sound in lfe. I have attached the code
> >  which i was
> > testing.
> >
> > 2) I wish to determine the number of channel my system support. I
> >  have a 5.1
> > system but
> > aout_FormatNbChannels( &p_filter->output ) was giving the number of
> >  channel
> > in file. Nor the values p_filter->input.i_physical_channels,
> > p_filter->input.i_original_channels,
> >  p_filter->output.i_physical_channels,
> > p_filter->output.i_original_channels are corresponding to number of
> > channels.
> >
>
> output.i_physical_channels should be set by audio output module. So results
> might vary if you for example try both DirectSound and Waveout outputs (APIs
> aren't same nor the device driver stuff).
>

So how do i determine number of channels supported? Can i manually set the
number of output channels in output.i_physical_channels?

>
> > 3) I need to do is to upmix a stream manually to the max supported
> >  channel.
> > Vista seems to do it atomically but i produce a 6ch stream from a 2ch
> > stream?
> >
>
> IIRC upmixing is done by device drivers. So it shouldn't be automatic from
> OS side.
>
> > Looking forward to hear soon.
> >
> > --
> > Regards
> > Assim
>
>
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-- 
Regards
Assim Deodia | http://nsitonline.in/assim
Undergraduate Student, Netaji Shubhas Institute of Technology
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