On Thu, 21 Dec 2006 17:44:55 +0100
Sebastian Schäfer <[EMAIL PROTECTED]> wrote:
> Hi!
>
> After I finally switched from that CMI3738 card to Intel HD Audio (a
> SigmaTel chip) I have another quite interesting problem:
>
> As the bass of the Intel HDA is a bit weak, I tried applying a LADSPA
> equalizer filter on it. After I spent most of the day to get that
> working I now have a problem:
>
> When playing a wave file (stereo) with aplay --> equalizer works
> absolutely fine.
>
> When playing a movie with 5.1 sound using mplayer --> sound is
> crackling, like it can't be played fast enough, or like when you ffwd
> through a dvd. Something like that.
>
> When playing the mentioned wave file with mplayer --> equalizer works
> fine.
>
> Is this ALSA's way to tell me that using that equalizer is not a good
> idea, or am I doing something wrong?
>
> My asound.conf looks like this:
> ----
> pcm.ladspa {
> type ladspa
> slave.pcm "plughw:0,0";
> path "/usr/lib/ladspa";
> channels 6
> plugins
> [
> {
> label dj_eq
> id 1901
> filename "/usr/lib/ladspa/dj_eq_1901.so"
> input {
> controls [ 0 0 0 ]
> }
> }
> ]
> }
>
> pcm.!default {
> type plug
> slave.pcm "ladspa";
> }
>
> pcm.!surround51 {
> type plug
> slave.pcm "ladspa";
> }
> ----
>
> The same thing happens when I use another plugin out of Steve Hariss'
> collection (tried with vynil).
> My worst fear is, that I have done nothing wrong and these plug-ins are
> simply not capable of coping with multichannel audio. But why are the
> additional 4 channels not just discarded, but the sound completely
> distorted?
>
> Thanks in advance for any help,
> Best wishes and a merry christmas to you all!
> Sebastian Schäfer
>
>
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For starters, do not boost bass, rather, suppress all the rest
- remember, you have limited number of bits to represent sound,
thus you should never have overflows.
Boosting something directly can cause overflows, boosting through
suppressing the rest can not (more or less).
--Sergei.
--
Visit my http://appsfromscratch.berlios.de/ open source project.
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