SNDRV_CHMAP_TFRC
[SNDRV_CHMAP_TFRC] = "TFRC",
SNDRV_CHMAP_TFRC, /* top front right of center */
map = SNDRV_CHMAP_TFRC;
[VIRTIO_SND_CHMAP_TFRC] = SNDRV_CHMAP_TFRC,