c->pic.key_frame = !(compr & 1);
c->pic.pict_type = (compr & 1) ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
for(j = 0; j < avctx->height; j++){
- if(compr & 1){
+ if((compr & 1) && tmpptr){
for(i = 0; i < avctx->width; i++)
outptr[i] = srcptr[i] ^ tmpptr[i];
tmpptr += stride;
case 13:
c->pic.key_frame = 0;
c->pic.pict_type = AV_PICTURE_TYPE_P;
+ if (!c->prev.data[0]) {
+ av_log(avctx, AV_LOG_ERROR, "Missing reference frame\n");
+ return AVERROR_INVALIDDATA;
+ }
decode_13(avctx, c, c->pic.data[0], srcptr, c->prev.data[0]);
break;
default: