AC3_CHMAP_L_SUR   260 libavcodec/ac3tab.c     AC3_CHMAP_L |               AC3_CHMAP_R | AC3_CHMAP_L_SUR |                  AC3_CHMAP_R_SUR,
AC3_CHMAP_L_SUR   261 libavcodec/ac3tab.c     AC3_CHMAP_L | AC3_CHMAP_C | AC3_CHMAP_R | AC3_CHMAP_L_SUR |                  AC3_CHMAP_R_SUR