hevc: fix key_frame as an IRAP

it was always 1 before with ISOBMFF(cherry picked from commit fb1402b1ec78d80acd6ced76bf78d65560965c4c)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/hevc.c

@@ -373,7 +373,7 @@ static int hls_slice_header(HEVCContext *s)
             ff_hevc_clear_refs(s);
     }
     sh->no_output_of_prior_pics_flag = 0;
-    if (s->nal_unit_type >= 16 && s->nal_unit_type <= 23)
+    if (IS_IRAP(s))
         sh->no_output_of_prior_pics_flag = get_bits1(gb);
     if (s->nal_unit_type == NAL_CRA_NUT && s->last_eos == 1)
         sh->no_output_of_prior_pics_flag = 1;
@@ -2862,6 +2862,7 @@ static int hevc_decode_frame(AVCodecContext *avctx, void *data, int *got_output,
     s->is_md5 = 0;
 
     if (s->is_decoded) {
+        s->ref->frame->key_frame = IS_IRAP(s);
         av_log(avctx, AV_LOG_DEBUG, "Decoded frame with POC %d.\n", s->poc);
         s->is_decoded = 0;
     }

libavcodec/hevc_parser.c

@@ -169,7 +169,7 @@ static inline int parse_nal_units(AVCodecParserContext *s, AVCodecContext *avctx
             s->picture_structure = h->picture_struct;
             s->field_order = h->picture_struct;
 
-            if (h->nal_unit_type >= 16 && h->nal_unit_type <= 23) {
+            if (IS_IRAP(h)) {
                 s->key_frame = 1;
                 sh->no_output_of_prior_pics_flag = get_bits1(gb);
             }