[FFmpeg-devel] [PATCH] audioconvert: define unique strings for 5POINT{0, 1}_BACK

[Nicolas George]

Le decadi 10 thermidor, an CCXIX, Stefano Sabatini a écrit :
> What's exactly the meaning of "back", and/or where I can find a
> description of it?

From audioconvert.h, with namespace prefix removed for readability:

#define 5POINT0      (SURROUND | SIDE_LEFT | SIDE_RIGHT)
#define 5POINT0_BACK (SURROUND | BACK_LEFT | BACK_RIGHT)

Therefore, I assume that you have 5.1 when the extra speakers are supposed
to be directly to the left and right of the listener whereas you have
5.1-back when the extra speakers are supposed to be significantly behind the
listener.

The following diagram gives an idea about the standard disposition of
speakers in 7.1; I suppose that 5.1 and 5.1-back are subsets:
http://en.wikipedia.org/wiki/File:Standard_7.1_surround_sound_speaker_placement.png
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