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QTAudioChannelDescriptionMBS constants

Coordinates array Indexes

Constant Value Description
kAudioChannelCoordinates_Azimuth 0 For spherical coordinates, 0 is front center, positive is right, negative is left. This is measured in degrees.
kAudioChannelCoordinates_BackFront 1 For rectangulare coordinates, negative is back and positive is front.
kAudioChannelCoordinates_Distance 2 For spherical coordinates, the units are described by flags.
kAudioChannelCoordinates_DownUp 2 For rectangulare coordinates, negative is below ground level, 0 is ground level, and positive is above ground level.
kAudioChannelCoordinates_Elevation 1 For spherical coordinates, +90 is zenith, 0 is horizontal, -90 is nadir. This is measured in degrees.
kAudioChannelCoordinates_LeftRight 0 For rectangulare coordinates, negative is left and positive is right.

Channel Coordinate Flags

Constant Value Description
kAudioChannelFlags_AllOff 0 All flags off.
kAudioChannelFlags_Meters 4 Set to indicate the units are in meters, clear to indicate the units are relative to the unit cube or unit sphere.
kAudioChannelFlags_RectangularCoordinates 1 The channel is specified by the cartesioan coordinates of the speaker position. This flag is mutally exclusive with kAudioChannelFlags_SphericalCoordinates.
kAudioChannelFlags_SphericalCoordinates 2 The channel is specified by the spherical coordinates of the speaker position. This flag is mutally exclusive with kAudioChannelFlags_RectangularCoordinates.

Channel Label Constants

Constant Value Description
kAudioChannelLabel_Ambisonic_W 200
kAudioChannelLabel_Ambisonic_X 201
kAudioChannelLabel_Ambisonic_Y 202
kAudioChannelLabel_Ambisonic_Z 203
kAudioChannelLabel_Center 3
kAudioChannelLabel_CenterSurround 9 WAVE: "Back Center" or plain "Rear Surround"
kAudioChannelLabel_CenterSurroundDirect 44 back center, non diffuse
kAudioChannelLabel_ClickTrack 304
kAudioChannelLabel_DialogCentricMix 43
kAudioChannelLabel_Discrete 400
kAudioChannelLabel_Discrete_0 &h10000
kAudioChannelLabel_Discrete_1 &h10001
kAudioChannelLabel_Discrete_10 &h1000A
kAudioChannelLabel_Discrete_11 &h1000B
kAudioChannelLabel_Discrete_12 &h1000C
kAudioChannelLabel_Discrete_13 &h1000D
kAudioChannelLabel_Discrete_14 &h1000E
kAudioChannelLabel_Discrete_15 &h1000F
kAudioChannelLabel_Discrete_2 &h10002
kAudioChannelLabel_Discrete_3 &h10003 Example
kAudioChannelLabel_Discrete_4 &h10004
kAudioChannelLabel_Discrete_5 &h10005
kAudioChannelLabel_Discrete_6 &h10006
kAudioChannelLabel_Discrete_65535 &h1FFFF
kAudioChannelLabel_Discrete_7 &h10007
kAudioChannelLabel_Discrete_8 &h10008
kAudioChannelLabel_Discrete_9 &h10009
kAudioChannelLabel_ForeignLanguage 305
kAudioChannelLabel_Haptic 45
kAudioChannelLabel_HeadphonesLeft 301
kAudioChannelLabel_HeadphonesRight 302
kAudioChannelLabel_HearingImpaired 40
kAudioChannelLabel_Left 1
kAudioChannelLabel_LeftCenter 7
kAudioChannelLabel_LeftSurround 5 WAVE: "Back Left"
kAudioChannelLabel_LeftSurroundDirect 10 WAVE: "Side Left"
kAudioChannelLabel_LeftTotal 38 matrix encoded 4 channels
kAudioChannelLabel_LeftWide 35
kAudioChannelLabel_LFE2 37
kAudioChannelLabel_LFEScreen 4
kAudioChannelLabel_Mono 42
kAudioChannelLabel_MS_Mid 204
kAudioChannelLabel_MS_Side 205
kAudioChannelLabel_Narration 41
kAudioChannelLabel_RearSurroundLeft 33
kAudioChannelLabel_RearSurroundRight 34
kAudioChannelLabel_Right 2
kAudioChannelLabel_RightCenter 8
kAudioChannelLabel_RightSurround 6 WAVE: "Back Right"
kAudioChannelLabel_RightSurroundDirect 11 WAVE: "Side Right"
kAudioChannelLabel_RightTotal 39 matrix encoded 4 channels
kAudioChannelLabel_RightWide 36
kAudioChannelLabel_TopBackCenter 17
kAudioChannelLabel_TopBackLeft 16
kAudioChannelLabel_TopBackRight 18
kAudioChannelLabel_TopCenterSurround 12
kAudioChannelLabel_Unknown &hFFFFFFFF Unknown or unspecified other use.
kAudioChannelLabel_Unused 0 Channel is present, but has no intended use or destination.
kAudioChannelLabel_UseCoordinates 100 Channel is described by the Coordinates fields.
kAudioChannelLabel_VerticalHeightCenter 14 WAVE: "Top Front Center"
kAudioChannelLabel_VerticalHeightLeft 13 WAVE: "Top Front Left"
kAudioChannelLabel_VerticalHeightRight 15 WAVE: "Top Front Right"
kAudioChannelLabel_XY_X 206
kAudioChannelLabel_XY_Y 207

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