[alsa-devel] what is the difference between SNDRV_PCM_IOCTL_WRITEN_FRAMES and SNDRV_PCM_IOCTL_WRITEI_FRAMES

I know the format likes below when use SNDRV_PCM_IOCTL_WRITEI_FRAMES http://lxr.free-electrons.com/ident?i=SNDRV_PCM_IOCTL_WRITEN_FRAMES L+R+L+R+L+R... L:a frame left channel data. R:a frame right channel data. Right?

But what is the kind of format when use SNDRV_PCM_IOCTL_WRITEN_FRAMES http://lxr.free-electrons.com/ident?i=SNDRV_PCM_IOCTL_WRITEN_FRAMES ?

Thank you:-) Br zw