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authorChris Robinson <[email protected]>2017-02-23 00:23:16 -0800
committerChris Robinson <[email protected]>2017-02-23 01:32:44 -0800
commit08948079e93cbb7321be5715df36f54c5e6be3b7 (patch)
tree5901fce0305094cc843698671c2689208e2f8df5 /openal.pc.in
parent0ce4c9b8fa90df6111fb81debf583b0fc9200063 (diff)
Alter how panpot/pair-wise panning works
This change allows pair-wise panning to mostly go through the normal ambisonic panning methods, with one special-case. First, a term is added to the stereo decoder matrix's X coefficient so that a centered sound is reduced by -3dB on each output channel. Panning in front creates a similar gain response to the typical L = sqrt(1-pan) R = sqrt(pan) for pan = [0,1]. Panning behind the listener can reduce (up to) an additional -10dB, creating a audible difference between front and back sounds as if simulating head obstruction. Secondly, as a special-case, the source positions are warped when calculating the ambisonic coefficients so that full left panning is reached at -30 degrees and full right at +30 degrees. This is to retain the expected 60-degree stereo width. This warping does not apply to B-Format buffer input, although it otherwise has the same gain responses.
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