[vlc-devel] Re: your vlc audio patch

Jean-Alexis Montignies ja at sente.ch
Tue Jun 22 20:29:45 CEST 2004

Note that the patch submitted by Matt, could work less than the 
previous version for certain people (I'm thinking of my step up 
especially :) )

My opinion on this thing is that we should forget about the current 
implementation and the recent fixes and use the HALOutputUnit like Xine 

It will be easier to implement correctly.
Moreover, it will give the user the possibility to specify its channel 
setup using the supplied AudioMidiSetup appliication.

The drawback is that it doesn't work with direct stream output (AC3). 
But isn't the things todo different enough to have two different 
approaches (2 modules?).

Jean-Alexis Montignies

On 22 juin 04, at 11:41, Mark Wells wrote:

> Matt
> Firstly, if you dont have the time to answer this, dont worry i'm sure 
> I'll figure it out. I just thought it was worth asking incase you can 
> put your finger straight on it. Im trying to figure out what 
> capabilities your patch provides, and therefore what the priorities 
> are for continuing where you left off.
> As far as I am aware from reading up on the vlc-devel list (correct me 
> if im wrong) your patch should provide successful multichannel support 
> for OS X. The only thing it doesnt do is let you choose how many 
> channels you want to use (ie it always uses the most channels it can 
> find). Right (in theory) ?
> I'm testing using an 8-channel audio device (yes, i've uncommented the 
> 8-channel support) and an ac3 audio stream. When I load the stream I 
> get the error "Something is wrong with the physical format indexing 
> i[0] j[2] fmt_idx[5]" I have also tried 6-channel instead, but get the 
> same error. Having looked at my input stream it seems to be a single 
> stream (therefore interleaved) with 9 formats.
> I guess all I'm asking is this: were you/others getting this error (ie 
> is this something I need to patch up before addressing the problem of 
> selecting how many channels to use) or is this error new news to you?
> Many thanks
> Mark
> ----------------------------------
> Mark Wells
> Oxford Semiconductor Ltd
> 25 Milton Park, Abingdon, OX14 4SH, UK

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