Multi-Channel Buffers

This describes a 4 channels buffer of 16 bit samples.
Data organisation :
Sample 1, front left speaker
Sample 1, front right speaker
Sample 1, back left speaker
Sample 1, back right speaker
Then
Sample 2, front left speaker
Sample 2, front right speaker…

This describes a 5.1 ( 6 channels ) buffer of 16 bit samples.
Data organisation :
Sample 1, front left speaker
Sample 1, front right speaker
Sample 1, front center speaker
Sample 1, low frequency speaker
Sample 1, back left speaker
Sample 1, back right speaker
Then
Sample 2, front left speaker
Sample 2, front right speaker…

This describes a 6.1 ( 7 channels ) buffer of 16 bit samples.
Data organisation :
Sample 1, front left speaker
Sample 1, front right speaker
Sample 1, front center speaker
Sample 1, low frequency speaker
Sample 1, back left speaker
Sample 1, back right speaker
Sample 1, back center speaker
Then
Sample 2, front left speaker
Sample 2, front right speaker…

This describes a 7.1 ( 8 channels ) buffer of 16 bit samples.
Data organisation :
Sample 1, front left speaker
Sample 1, front right speaker
Sample 1, front center speaker
Sample 1, low frequency speaker
Sample 1, back left speaker
Sample 1, back right speaker
Sample 1, side left speaker
Sample 1, side right speaker
Then
Sample 2, front left speaker
Sample 2, front right speaker…

#define MONO SPEAKER_FRONT_CENTER
#define STEREO (SPEAKER_FRONT_LEFT|SPEAKER_FRONT_RIGHT)
#define QUAD (SPEAKER_FRONT_LEFT|SPEAKER_FRONT_RIGHT|SPEAKER_BACK_LEFT|SPEAKER_BACK_RIGHT)
#define X5DOT1 (SPEAKER_FRONT_LEFT|SPEAKER_FRONT_RIGHT|SPEAKER_FRONT_CENTER|SPEAKER_LOW_FREQUENCY|SPEAKER_SIDE_LEFT|SPEAKER_SIDE_RIGHT)
#define X5DOT1REAR (SPEAKER_FRONT_LEFT|SPEAKER_FRONT_RIGHT|SPEAKER_FRONT_CENTER|SPEAKER_LOW_FREQUENCY|SPEAKER_BACK_LEFT|SPEAKER_BACK_RIGHT)
#define X6DOT1 (SPEAKER_FRONT_LEFT|SPEAKER_FRONT_RIGHT|SPEAKER_FRONT_CENTER|SPEAKER_LOW_FREQUENCY|SPEAKER_BACK_CENTER|SPEAKER_SIDE_LEFT|SPEAKER_SIDE_RIGHT)
#define X7DOT1 (SPEAKER_FRONT_LEFT|SPEAKER_FRONT_RIGHT|SPEAKER_FRONT_CENTER|SPEAKER_LOW_FREQUENCY|SPEAKER_BACK_LEFT|SPEAKER_BACK_RIGHT|SPEAKER_SIDE_LEFT|SPEAKER_SIDE_RIGHT)
#define X7DOT1_WIDE(SPEAKER_FRONT_LEFT|SPEAKER_FRONT_RIGHT|SPEAKER_FRONT_CENTER|SPEAKER_LOW_FREQUENCY|SPEAKER_BACK_LEFT|SPEAKER_BACK_RIGHT|SPEAKER_FRONT_LEFT_OF_CENTER|SPEAKER_FRONT_RIGHT_OF_CENTER)

其中FMODE这样定义的

#define FMOD_CHANNELMASK_MONO                       (FMOD_CHANNELMASK_FRONT_LEFT)
#define FMOD_CHANNELMASK_STEREO                     (FMOD_CHANNELMASK_FRONT_LEFT | FMOD_CHANNELMASK_FRONT_RIGHT)
#define FMOD_CHANNELMASK_LRC                        (FMOD_CHANNELMASK_FRONT_LEFT | FMOD_CHANNELMASK_FRONT_RIGHT | FMOD_CHANNELMASK_FRONT_CENTER)
#define FMOD_CHANNELMASK_QUAD                       (FMOD_CHANNELMASK_FRONT_LEFT | FMOD_CHANNELMASK_FRONT_RIGHT | FMOD_CHANNELMASK_SURROUND_LEFT | FMOD_CHANNELMASK_SURROUND_RIGHT)
#define FMOD_CHANNELMASK_SURROUND                   (FMOD_CHANNELMASK_FRONT_LEFT | FMOD_CHANNELMASK_FRONT_RIGHT | FMOD_CHANNELMASK_FRONT_CENTER  | FMOD_CHANNELMASK_SURROUND_LEFT | FMOD_CHANNELMASK_SURROUND_RIGHT)
#define FMOD_CHANNELMASK_5POINT1                    (FMOD_CHANNELMASK_FRONT_LEFT | FMOD_CHANNELMASK_FRONT_RIGHT | FMOD_CHANNELMASK_FRONT_CENTER  | FMOD_CHANNELMASK_LOW_FREQUENCY | FMOD_CHANNELMASK_SURROUND_LEFT  | FMOD_CHANNELMASK_SURROUND_RIGHT)
#define FMOD_CHANNELMASK_5POINT1_REARS              (FMOD_CHANNELMASK_FRONT_LEFT | FMOD_CHANNELMASK_FRONT_RIGHT | FMOD_CHANNELMASK_FRONT_CENTER  | FMOD_CHANNELMASK_LOW_FREQUENCY | FMOD_CHANNELMASK_BACK_LEFT      | FMOD_CHANNELMASK_BACK_RIGHT)
#define FMOD_CHANNELMASK_7POINT0                    (FMOD_CHANNELMASK_FRONT_LEFT | FMOD_CHANNELMASK_FRONT_RIGHT | FMOD_CHANNELMASK_FRONT_CENTER  | FMOD_CHANNELMASK_SURROUND_LEFT | FMOD_CHANNELMASK_SURROUND_RIGHT | FMOD_CHANNELMASK_BACK_LEFT      | FMOD_CHANNELMASK_BACK_RIGHT)
#define FMOD_CHANNELMASK_7POINT1                    (FMOD_CHANNELMASK_FRONT_LEFT | FMOD_CHANNELMASK_FRONT_RIGHT | FMOD_CHANNELMASK_FRONT_CENTER  | FMOD_CHANNELMASK_LOW_FREQUENCY | FMOD_CHANNELMASK_SURROUND_LEFT  | FMOD_CHANNELMASK_SURROUND_RIGHT | FMOD_CHANNELMASK_BACK_LEFT | FMOD_CHANNELMASK_BACK_RIGHT)

MONO                   = (FRONT_LEFT),
STEREO                 = (FRONT_LEFT | FRONT_RIGHT),
LRC                    = (FRONT_LEFT | FRONT_RIGHT | FRONT_CENTER),
QUAD                   = (FRONT_LEFT | FRONT_RIGHT | SURROUND_LEFT | SURROUND_RIGHT),
SURROUND               = (FRONT_LEFT | FRONT_RIGHT | FRONT_CENTER | SURROUND_LEFT | SURROUND_RIGHT),
_5POINT1               = (FRONT_LEFT | FRONT_RIGHT | FRONT_CENTER | LOW_FREQUENCY | SURROUND_LEFT | SURROUND_RIGHT),
_5POINT1_REARS         = (FRONT_LEFT | FRONT_RIGHT | FRONT_CENTER | LOW_FREQUENCY | BACK_LEFT | BACK_RIGHT),
_7POINT0               = (FRONT_LEFT | FRONT_RIGHT | FRONT_CENTER | SURROUND_LEFT | SURROUND_RIGHT | BACK_LEFT | BACK_RIGHT),
_7POINT1               = (FRONT_LEFT | FRONT_RIGHT | FRONT_CENTER | LOW_FREQUENCY | SURROUND_LEFT | SURROUND_RIGHT | BACK_LEFT | BACK_RIGHT)

好像有点不一样