static int output_configure(AACContext *ac, uint8_t layout_map[MAX_ELEM_ID * 4][3], int tags, enum OCStatus oc_type, int get_new_frame) { AVCodecContext *avctx = ac->avctx; int i, channels = 0, ret; uint64_t layout = 0; uint8_t id_map[TYPE_END][MAX_ELEM_ID] = {{ 0 }}; uint8_t type_counts[TYPE_END] = { 0 }; if (ac->oc[1].layout_map != layout_map) { memcpy(ac->oc[1].layout_map, layout_map, tags * sizeof(layout_map[0])); ac->oc[1].layout_map_tags = tags; for (i = 0; i < tags; i++) { int type = layout_map[i][0]; int id = layout_map[i][1]; id_map[type][id] = type_counts[type]++; // Try to sniff a reasonable channel order, otherwise output the // channels in the order the PCE declared them. if (avctx->request_channel_layout != AV_CH_LAYOUT_NATIVE) layout = sniff_channel_order(layout_map, tags); for (i = 0; i < tags; i++) { int type = layout_map[i][0]; int id = layout_map[i][1]; int iid = id_map[type][id]; int position = layout_map[i][2]; // Allocate or free elements depending on if they are in the // current program configuration. ret = che_configure(ac, position, type, iid, &channels); if (ret < 0) return ret; ac->tag_che_map[type][id] = ac->che[type][iid]; if (ac->oc[1].m4ac.ps == 1 && channels == 2) { if (layout == AV_CH_FRONT_CENTER) { layout = AV_CH_FRONT_LEFT|AV_CH_FRONT_RIGHT; } else { layout = 0; if (layout) avctx->channel_layout = layout; ac->oc[1].channel_layout = layout; avctx->channels = ac->oc[1].channels = channels; ac->oc[1].status = oc_type; if (get_new_frame) { if ((ret = frame_configure_elements(ac->avctx)) < 0) return ret; return 0;