Bottom front center
Bottom front left
Bottom front right
Front center
Front left
Front left of center
Front right
Front right of center
invalid position
Low-frequency effects 1 (subwoofer)
Low-frequency effects 2 (subwoofer)
Mono without direction; can only be used with 1 channel
used for position-less channels, e.g. from a sound card that records 1024 channels; mutually exclusive with any other channel position
Rear center
Rear left
Rear right
Side left
Side right
Surround left (between rear left and side left)
Surround right (between rear right and side right)
Top center
Top front center
Top front left
Top front right
Top rear center
Top rear left
Top rear right
Top side right
Top rear right
Wide left (between front left and side left)
Wide right (between front right and side right)
Audio channel positions.
These are the channels defined in SMPTE 2036-2-2008 Table 1 for 22.2 audio systems with the Surround and Wide channels from DTS Coherent Acoustics (v.1.3.1) and 10.2 and 7.1 layouts. In the caps the actual channel layout is expressed with a channel count and a channel mask, which describes the existing channels. The positions in the bit mask correspond to the enum values. For negotiation it is allowed to have more bits set in the channel mask than the number of channels to specify the allowed channel positions but this is not allowed in negotiated caps. It is not allowed in any situation other than the one mentioned below to have less bits set in the channel mask than the number of channels.
GST_AUDIO_CHANNEL_POSITION_MONOcan only be used with a single mono channel that has no direction information and would be mixed into all directional channels. This is expressed in caps by having a single channel and no channel mask.GST_AUDIO_CHANNEL_POSITION_NONEcan only be used if all channels have this position. This is expressed in caps by having a channel mask with no bits set.As another special case it is allowed to have two channels without a channel mask. This implicitly means that this is a stereo stream with a front left and front right channel.