Re: Recognize the Sound Source Position (Can't identify front and back sound).

On Friday, June 17, 2011 1:12:16 PM Matheus Bratfisch wrote:
> Basic that is it. When I put the sound source in my Left, I can identify it
> on my head phone, when I put it on left I can too, but when I put on front
> or back. I can't identify if the sound is playing in my front or in my
> back.

Hi.

The latest version of OpenAL Soft (the Linux version of OpenAL) doesn't really   
do any tricks to differentiate between front and back for stereo output. It 
only pans between the two speakers depending on the source's transformed 
position. To get a proper surround sound effect, you need to have a 4+ channel 
setup.

The current Git version of OpenAL Soft, on the other hand, does implement an 
HRTF filter, which should provide front and back spatialization cues for 
headphones. It doesn't enable by default (as I've not found a way to tell the 
difference between plain stereo and headphones from PulseAudio, and I'm not 
sure of the performance impact), but it is fairly easy to turn on. Just add

[general]
hrtf = on

to ~/.alsoftrc, and it will be enabled when output is 44100hz stereo (a 
warning will be printed to stderr if it gets disabled for some reason). You 
can also add

frequency = 44100

to try and force 44100hz playback, if needed.
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