hevc: implement pic_output_flag handling

Sample-Id: OPFLAG_B_Qualcomm_1.bit, OPFLAG_C_Qualcomm_1.bit
Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
Signed-off-by: Anton Khirnov <anton@khirnov.net>

libavcodec/hevc.c

@@ -546,6 +546,8 @@ static int hls_slice_header(HEVCContext *s)
             return AVERROR_INVALIDDATA;
         }
 
+        // when flag is not present, picture is inferred to be output
+        sh->pic_output_flag = 1;
         if (s->pps->output_flag_present_flag)
             sh->pic_output_flag = get_bits1(gb);
 

libavcodec/hevc_refs.c

@@ -143,8 +143,12 @@ int ff_hevc_set_new_ref(HEVCContext *s, AVFrame **frame, int poc)
     *frame = ref->frame;
     s->ref = ref;
 
+    if (s->sh.pic_output_flag)
+        ref->flags = HEVC_FRAME_FLAG_OUTPUT | HEVC_FRAME_FLAG_SHORT_REF;
+    else
+        ref->flags = HEVC_FRAME_FLAG_SHORT_REF;
+
     ref->poc      = poc;
-    ref->flags    = HEVC_FRAME_FLAG_OUTPUT | HEVC_FRAME_FLAG_SHORT_REF;
     ref->sequence = s->seq_decode;
     ref->window   = s->sps->output_window;