#unconditional
#sorted sed -En 's/.*v4l2_fourcc(_be)?\('"'(.)', '(.)', '(.)', '(.)'"'\).*/\10\5\4\3\2\t\0/p' |LC_COLLATE=C sort -k1,1 -t' ' |cut -f2-
V4L2_SDR_FMT_PCU20BE
V4L2_SDR_FMT_RU12LE
V4L2_SDR_FMT_CS14LE
V4L2_SDR_FMT_PCU16BE
V4L2_SDR_FMT_CU16LE
V4L2_SDR_FMT_CS8
V4L2_SDR_FMT_CU8
V4L2_SDR_FMT_PCU18BE