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- Ambisonic decoder configuration presets are provided here for common surround
- sound speaker layouts. The presets are prepared to work with OpenAL Soft's high
- quality decoder. By default all of the speaker distances within a preset are
- set to the same value, which results in no effect from distance compensation.
- If this doesn't match your physical speaker setup, it may be worth copying the
- preset and modifying the distance values to match (note that modifying the
- azimuth and elevation values in the presets will not have any effect; the
- specified angles do not change the decoder behavior).
-
- Details of the individual presets are as follows.
-
- square.ambdec
- Specifies a basic square speaker setup for Quadraphonic output, with identical
- width and depth. Front speakers are placed at +45 and -45 degrees, and back
- speakers are placed at +135 and -135 degrees.
-
- rectangle.ambdec
- Specifies a narrower speaker setup for Quadraphonic output, with a little less
- width but a little more depth over a basic square setup. Front speakers are
- placed at +30 and -30 degrees, providing a bit more compatibility for existing
- stereo content, with back speakers at +150 and -150 degrees.
-
- itu5.1.ambdec
- Specifies a standard ITU 5.0/5.1 setup for 5.1 Surround output. The front-
- center speaker is placed directly in front at 0 degrees, with the front-left
- and front-right at +30 and -30 degrees, and the surround speakers (side or
- back) at +110 and -110 degrees.
-
- hexagon.ambdec
- Specifies a flat-front hexagonal speaker setup for 7.1 Surround output. The
- front left and right speakers are placed at +30 and -30 degrees, the side
- speakers are placed at +90 and -90 degrees, and the back speakers are placed at
- +150 and -150 degrees. Although this is for 7.1 output, no front-center speaker
- is defined for the decoder, meaning that speaker will be silent for 3D sound
- (however it may still be used with AL_SOFT_direct_channels or ALC_EXT_DEDICATED
- output). A "proper" 7.1 decoder may be provided in the future, but due to the
- nature of the speaker configuration will have trade-offs.
-
- 3D7.1.ambdec
- Specifies a 3D7.1 speaker setup for 3D7.1 Surround output. Please see
- docs/3D7.1.txt for information about speaker placement. Similar to 7.1, the
- front-center speaker is not used for 3D sound, but will be used as appropriate
- with AL_SOFT_direct_channels or ALC_EXT_DEDICATED.
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