2021-04-28 12:43:51 +08:00
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Ambisonic decoder configuration presets are provided here for common surround
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sound speaker layouts. The presets are prepared to work with OpenAL Soft's high
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quality decoder. By default all of the speaker distances within a preset are
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set to the same value, which results in no effect from distance compensation.
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If this doesn't match your physical speaker setup, it may be worth copying the
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preset and modifying the distance values to match (note that modifying the
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azimuth and elevation values in the presets will not have any effect; the
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specified angles do not change the decoder behavior).
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Details of the individual presets are as follows.
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square.ambdec
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Specifies a basic square speaker setup for Quadraphonic output, with identical
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width and depth. Front speakers are placed at +45 and -45 degrees, and back
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speakers are placed at +135 and -135 degrees.
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rectangle.ambdec
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Specifies a narrower speaker setup for Quadraphonic output, with a little less
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width but a little more depth over a basic square setup. Front speakers are
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placed at +30 and -30 degrees, providing a bit more compatibility for existing
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stereo content, with back speakers at +150 and -150 degrees.
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itu5.1.ambdec
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Specifies a standard ITU 5.0/5.1 setup for 5.1 Surround output. The front-
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center speaker is placed directly in front at 0 degrees, with the front-left
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and front-right at +30 and -30 degrees, and the surround speakers (side or
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back) at +110 and -110 degrees.
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hexagon.ambdec
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Specifies a flat-front hexagonal speaker setup for 7.1 Surround output. The
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front left and right speakers are placed at +30 and -30 degrees, the side
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speakers are placed at +90 and -90 degrees, and the back speakers are placed at
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+150 and -150 degrees. Although this is for 7.1 output, no front-center speaker
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is defined for the decoder, meaning that speaker will be silent for 3D sound
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(however it may still be used with AL_SOFT_direct_channels or ALC_EXT_DEDICATED
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output). A "proper" 7.1 decoder may be provided in the future, but due to the
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nature of the speaker configuration will have trade-offs.
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2023-02-04 15:03:54 +08:00
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hex-quad.ambdec
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Specifies a flat-front hexagonal speaker setup, plus an elevated quad speaker
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setup, for 7.1.4 Surround output. The front left and right speakers are placed
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at +30 and -30 degrees, the side speakers are placed at +90 and -90 degrees,
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and the back speakers are placed at +150 and -150 degrees. The elevated
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speakers are placed at an elevation of +35 degrees, with the top front left and
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right speakers placed at +45 and -45 degrees, and the top back left and right
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speakers placed at +135 and -135 degrees. Similar to 7.1, the front-center
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speaker is not used for 3D sound, but will be used as appropriate with
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AL_SOFT_direct_channels or ALC_EXT_DEDICATED.
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2021-04-28 12:43:51 +08:00
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3D7.1.ambdec
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2022-07-14 23:17:11 +08:00
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Specifies a 3D7.1 speaker setup for 3D7.1 Surround output. Please see
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docs/3D7.1.txt for information about speaker placement. Similar to 7.1, the
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front-center speaker is not used for 3D sound, but will be used as appropriate
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with AL_SOFT_direct_channels or ALC_EXT_DEDICATED.
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