Set context variable key_frame in H264 parser.

Patch by Ivan Schreter, schreter gmx net

Originally committed as revision 17489 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h264_parser.c

@@ -118,8 +118,10 @@ static inline int parse_nal_units(AVCodecParserContext *s,
 
     /* set some sane default values */
     s->pict_type = FF_I_TYPE;
+    s->key_frame = 0;
 
     h->s.avctx= avctx;
+    h->sei_recovery_frame_cnt = -1;
 
     for(;;) {
         int src_length, dst_length, consumed;
@@ -152,10 +154,16 @@ static inline int parse_nal_units(AVCodecParserContext *s,
             ff_h264_decode_sei(h);
             break;
         case NAL_IDR_SLICE:
+            s->key_frame = 1;
+            /* fall through */
         case NAL_SLICE:
             get_ue_golomb(&h->s.gb);  // skip first_mb_in_slice
             slice_type = get_ue_golomb_31(&h->s.gb);
             s->pict_type = golomb_to_pict_type[slice_type % 5];
+            if (h->sei_recovery_frame_cnt >= 0) {
+                /* key frame, since recovery_frame_cnt is set */
+                s->key_frame = 1;
+            }
             return 0; /* no need to evaluate the rest */
         }
         buf += consumed;