MAX_CHANNELS
#define MAX_CHANNELS (4)
#define MAX_CHANNELS (2)
# define MAX_CHANNELS(x) (((x) & 0x7) << 0)
# define MAX_CHANNELS(x) (((x) & 0x7) << 0)
# define MAX_CHANNELS(x) (((x) & 0x7) << 0)
# define MAX_CHANNELS(x) (((x) & 0x7) << 0)