[mythtv] [mythtv-commits] Ticket #1104: multichannelaudio support

[Paul Catchpole]

Paul Catchpole wrote:
> Ed Wildgoose wrote:
>   
>>> It works fine with the audio device for the frontend changed to a 
>>> 2-channel one. It's only when using the real 6-channel device and hence 
>>> the upmixer where the clipping occurs.
>>>   
>>>     
>>>       
>> #Often you have multiple volume controls for multichannel versus two 
>> channel - perhaps the multichannel mixer is too loud and causing the 
>> clipping?
>>
>> Ed
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>>   
>>     
> The 2-channel device used for testing is a simple ALSA upmixer with an 
> additional soft-volume added on top. I set the relative mixer levels a 
> long while ago and they've not changed since. I don't have a master on 
> this card, hence the softvol. I don't change the levels to test the 5.1 
> direct output, just move to another device which is the surround51 with 
> a softvol on top.
>
> For the previous testing I did of patch-38 [I think], where I had 
> clipping problems, I tried reducing mixer levels to no avail - the 
> 'clipped' output just happily scaled with the rest of the sound.
>
> I think Mark is probably correct in thinking it's a mathematical issue 
> with the new upmixer code, which seems to use lots of floating-point 
> maths...
>
> PC
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>   
Cheers for the patch, Mark.

Recompiling with patch-42 now.

Ta,

Paul