define confusion

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Could someone explain this a little bit more pls? The comment at the
top doesn't clarify it for me!

Thanks in advance.

/*
 * DAI hardware clock masters
 * This is wrt the codec, the inverse is true for the interface
 * i.e. if the codec is clk and frm master then the interface is
 * clk and frame slave.
 */
#define SND_SOC_DAIFMT_CBM_CFM	(0 << 12) /* codec clk & frm master */
#define SND_SOC_DAIFMT_CBS_CFM	(1 << 12) /* codec clk slave & frm master */
#define SND_SOC_DAIFMT_CBM_CFS	(2 << 12) /* codec clk master & frame slave */
#define SND_SOC_DAIFMT_CBS_CFS	(3 << 12) /* codec clk & frm slave */
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