SNDRV_PCM_SUBFORMAT_STD  243 include/sound/asound.h #define	SNDRV_PCM_SUBFORMAT_LAST	SNDRV_PCM_SUBFORMAT_STD
SNDRV_PCM_SUBFORMAT_STD 1938 sound/core/pcm_native.c 	err = snd_pcm_hw_constraint_mask(runtime, SNDRV_PCM_HW_PARAM_SUBFORMAT, 1 << SNDRV_PCM_SUBFORMAT_STD);