Peter Valdemar Morch wrote:
David myth-at-dgreaves.com |Lists| wrote:
Check to see if alsamixer has got a '3D' or 'duplicate front' switch set
I doubt it's mythmusic - it'll (probably) just send the stereo signal to the pcm channel.
Also, another option, on my setup it all goes from the pc (via spdif) to an external hi-fi surround processor and I have to turn the pro-logic setting off on the processor to prevent it from trying to decode the stereo into 'surround sound'.
what hardware setup do you have (ie soundcard -> amplifiers)
I'm using a Sound Blaster Audigy2 and Alsa on a Creative Labs Gigaworks 750 7.1 speaker system.
OK.
I've tried configuring Xine and mplayer to just send out 2.0 stereo (an mp3 music file), and yes, the sound comes out of all speakers, not just the front ones. Now I don't know where the upmixing is done.
If I set the ALSA 'Center' and 'Surround' settings to 0 with:
amixer set Center 0
amixer set Surround 0
, the sound only comes from the two front speakers. But then that is true regardless of whether the source is 2.0 or 5.1. :-(
So it seems 2.0 stereo is upmixed to 5.1 in or before ALSA.. But where?
Isn't this a good diagram:
MPlayer \ -------- --------------- -------------- -------- +---| Alsa |---| snd-emu10k1 |---| Audigy2 HW |---|GW 750| Xine / -------- --------------- -------------- --------
Since I can adjust the center and rear speaker volumes in alsamixer, and it then works/applies for both xine and mplayer, then my guess is that the upmixing is taking place in ALSA, right? Or is that done in both MPlayer and Xine? If its taking place in ALSA, how do I disable it?
<minor_question>
Where do I find any documentation for what the different controls actually precisely mean? Such as 'LFE', 'PCM' etc? Anyway, the '3D Control - Switch' is off. And what all the alsa.conf settings mean?
</minor_question>
no easy reference that I know of... LFE - Low Frequency Effects (subwoofer rumbles) PCM - pulse coded modulation - erm, digital (CD/wav) audio format
amixer output:
all looks OK.
try: http://www.alsa-project.org/~james/speaker-test/
David
David
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