Re: [ecasound] Problems with 24/96 over stdin

On Sun, Apr 19, 2009 at 7:05 PM, Kai Vehmanen <kvehmanen@email-addr-hidden> wrote:
> Hmm,
>
> On Sun, 19 Apr 2009, kls.schlz@email-addr-hidden wrote:
>
>> BUT: How do I get rid of the 8 extra bits when sending the stream to my
>> 24 bit sound card? Currently it seems I have an 8bit attentuation
>> ongoing.
>
> yikes. That suggests that mpd is using yet another encoding, i.e. 24bits
> in 32bit words, but with most-significant 8bits padded to zero.
>
> Is volume ok with aplay..?
>
>> | ecasound -q -B:rt -b:64 -r:80 -f:s32_le,2,96000,i -i:stdin -f:s24_le,2,96000,i -o:alsaplugin,0,0 2>/dev/null
>
> If the above hypothesis is correct, adding "-ea:25600" should get the
> volume back to its original level (effectively bitshifting each sample
> left by 8). The real-fix would be to figure out what exact format
> mpd is sending...

If the above hypothesis is correct, I feel it should be reported as a
bug in MPD. It doesn't make much sense to pad the most significant 8
bits to zero, does it?

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Received on Tue Apr 21 16:15:02 2009