gistfile1.txt

/**

The values are the same, see:

SPEAKER_FRONT_LEFT	0x1
SPEAKER_FRONT_RIGHT	0x2
SPEAKER_FRONT_CENTER	0x4
SPEAKER_LOW_FREQUENCY	0x8
SPEAKER_BACK_LEFT	0x10
SPEAKER_BACK_RIGHT	0x20
SPEAKER_FRONT_LEFT_OF_CENTER	0x40
SPEAKER_FRONT_RIGHT_OF_CENTER	0x80
SPEAKER_BACK_CENTER	0x100
SPEAKER_SIDE_LEFT	0x200
SPEAKER_SIDE_RIGHT	0x400
SPEAKER_TOP_CENTER	0x800
SPEAKER_TOP_FRONT_LEFT	0x1000
SPEAKER_TOP_FRONT_CENTER	0x2000
SPEAKER_TOP_FRONT_RIGHT	0x4000
SPEAKER_TOP_BACK_LEFT	0x8000
SPEAKER_TOP_BACK_CENTER	0x10000
SPEAKER_TOP_BACK_RIGHT	0x20000

#define 	AV_CH_FRONT_LEFT   0x00000001
#define 	AV_CH_FRONT_RIGHT   0x00000002
#define 	AV_CH_FRONT_CENTER   0x00000004
#define 	AV_CH_LOW_FREQUENCY   0x00000008
#define 	AV_CH_BACK_LEFT   0x00000010
#define 	AV_CH_BACK_RIGHT   0x00000020
#define 	AV_CH_FRONT_LEFT_OF_CENTER   0x00000040
#define 	AV_CH_FRONT_RIGHT_OF_CENTER   0x00000080
#define 	AV_CH_BACK_CENTER   0x00000100
#define 	AV_CH_SIDE_LEFT   0x00000200
#define 	AV_CH_SIDE_RIGHT   0x00000400
#define 	AV_CH_TOP_CENTER   0x00000800
#define 	AV_CH_TOP_FRONT_LEFT   0x00001000
#define 	AV_CH_TOP_FRONT_CENTER   0x00002000
#define 	AV_CH_TOP_FRONT_RIGHT   0x00004000
#define 	AV_CH_TOP_BACK_LEFT   0x00008000
#define 	AV_CH_TOP_BACK_CENTER   0x00010000
#define 	AV_CH_TOP_BACK_RIGHT   0x00020000
#define 	AV_CH_STEREO_LEFT   0x20000000
 	Stereo downmix.
#define 	AV_CH_STEREO_RIGHT   0x40000000
 	See AV_CH_STEREO_LEFT. 
*/

// So you want a whole list of these

static_assert (SPEAKER_FRONT_LEFT == AV_CH_FRONT_LEFT);
static_assert (SPEAKER_FRONT_RIGHT == AV_CH_FRONT_RIGHT);

// Then you can just pass in the value you get from dwChannelMask