SNDRV_PCM_HW_PARAM_SUBFORMAT 347 include/sound/pcm_params.h snd_mask_min(hw_param_mask_c((p), SNDRV_PCM_HW_PARAM_SUBFORMAT)) SNDRV_PCM_HW_PARAM_SUBFORMAT 317 include/uapi/sound/asound.h #define SNDRV_PCM_HW_PARAM_LAST_MASK SNDRV_PCM_HW_PARAM_SUBFORMAT