avcodec/av1dec: make CBS parse only the OBU types we care about

Signed-off-by: James Almer <jamrial@gmail.com>

libavcodec/av1dec.c

@@ -752,6 +752,16 @@ static int update_context_with_frame_header(AVCodecContext *avctx,
     return 0;
 }
 
+static const CodedBitstreamUnitType decompose_unit_types[] = {
+    AV1_OBU_FRAME,
+    AV1_OBU_FRAME_HEADER,
+    AV1_OBU_METADATA,
+    AV1_OBU_REDUNDANT_FRAME_HEADER,
+    AV1_OBU_SEQUENCE_HEADER,
+    AV1_OBU_TEMPORAL_DELIMITER,
+    AV1_OBU_TILE_GROUP,
+};
+
 static av_cold int av1_decode_init(AVCodecContext *avctx)
 {
     AV1DecContext *s = avctx->priv_data;
@@ -781,6 +791,9 @@ static av_cold int av1_decode_init(AVCodecContext *avctx)
     if (ret < 0)
         return ret;
 
+    s->cbc->decompose_unit_types    = decompose_unit_types;
+    s->cbc->nb_decompose_unit_types = FF_ARRAY_ELEMS(decompose_unit_types);
+
     s->itut_t35_fifo = av_fifo_alloc2(1, sizeof(AV1RawMetadataITUTT35),
                                       AV_FIFO_FLAG_AUTO_GROW);
     if (!s->itut_t35_fifo)