Don't test for H264 encoding unless an encoder exists.

Originally committed as revision 14048 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/h264.c

@@ -2726,9 +2726,9 @@ static void hl_decode_mb(H264Context *h){
     MpegEncContext * const s = &h->s;
     const int mb_xy= h->mb_xy;
     const int mb_type= s->current_picture.mb_type[mb_xy];
-    int is_complex = FRAME_MBAFF || MB_FIELD || IS_INTRA_PCM(mb_type) || s->codec_id != CODEC_ID_H264 || (ENABLE_GRAY && (s->flags&CODEC_FLAG_GRAY)) || s->encoding;
+    int is_complex = FRAME_MBAFF || MB_FIELD || IS_INTRA_PCM(mb_type) || s->codec_id != CODEC_ID_H264 || (ENABLE_GRAY && (s->flags&CODEC_FLAG_GRAY)) || (ENABLE_H264_ENCODER && s->encoding);
 
-    if(!s->decode)
+    if(ENABLE_H264_ENCODER && !s->decode)
         return;
 
     if (is_complex)

libavcodec/h264.h

@@ -70,6 +70,10 @@
 #endif
 #define FIELD_OR_MBAFF_PICTURE (FRAME_MBAFF || FIELD_PICTURE)
 
+#ifndef ENABLE_H264_ENCODER
+#define ENABLE_H264_ENCODER 0
+#endif
+
 /**
  * Sequence parameter set
  */