#else
if (s->xch_present && !s->xch_disable) {
#endif
+ if (avctx->channel_layout & AV_CH_BACK_CENTER) {
+ avpriv_request_sample(avctx, "XCh with Back center channel");
+ return AVERROR_INVALIDDATA;
+ }
avctx->channel_layout |= AV_CH_BACK_CENTER;
if (s->lfe) {
avctx->channel_layout |= AV_CH_LOW_FREQUENCY;