avcodec/mpegvideo: Don't set unrestricted_mv for decoders

It is write-only for them.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/flvdec.c

@@ -90,7 +90,6 @@ int ff_flv_decode_picture_header(MpegEncContext *s)
 
     s->h263_plus = 0;
 
-    s->unrestricted_mv   = 1;
     s->h263_long_vectors = 0;
 
     /* PEI */

libavcodec/h263dec.c

@@ -83,13 +83,11 @@ av_cold int ff_h263_decode_init(AVCodecContext *avctx)
     s->quant_precision = 5;
     s->decode_mb       = ff_h263_decode_mb;
     s->low_delay       = 1;
-    s->unrestricted_mv = 1;
 
     /* select sub codec */
     switch (avctx->codec->id) {
     case AV_CODEC_ID_H263:
     case AV_CODEC_ID_H263P:
-        s->unrestricted_mv = 0;
         avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
         break;
     case AV_CODEC_ID_MPEG4:

libavcodec/intelh263dec.c

@@ -66,7 +66,6 @@ int ff_intel_h263_decode_picture_header(MpegEncContext *s)
         return -1;      /* SAC: off */
     }
     s->obmc= get_bits1(&s->gb);
-    s->unrestricted_mv = s->obmc || s->h263_long_vectors;
     s->pb_frame = get_bits1(&s->gb);
 
     if (format < 6) {

libavcodec/ituh263dec.c

@@ -1150,7 +1150,6 @@ int ff_h263_decode_picture_header(MpegEncContext *s)
             return -1; /* SAC: off */
         }
         s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
-        s->unrestricted_mv = s->h263_long_vectors || s->obmc;
 
         s->pb_frame = get_bits1(&s->gb);
         s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
@@ -1180,7 +1179,6 @@ int ff_h263_decode_picture_header(MpegEncContext *s)
             s->obmc= get_bits1(&s->gb); /* Advanced prediction mode */
             s->h263_aic = get_bits1(&s->gb); /* Advanced Intra Coding (AIC) */
             s->loop_filter= get_bits1(&s->gb);
-            s->unrestricted_mv = s->umvplus || s->obmc || s->loop_filter;
             if(s->avctx->lowres)
                 s->loop_filter = 0;
 

libavcodec/rv10.c

@@ -149,7 +149,6 @@ static int rv10_decode_picture_header(MpegEncContext *s)
     }
     skip_bits(&s->gb, 3);   /* ignored */
     s->f_code          = 1;
-    s->unrestricted_mv = 1;
 
     return mb_count;
 }
@@ -298,7 +297,6 @@ static int rv20_decode_picture_header(RVDecContext *rv, int whole_size)
         skip_bits(&s->gb, 5);
 
     s->f_code          = 1;
-    s->unrestricted_mv = 1;
     s->h263_aic        = s->pict_type == AV_PICTURE_TYPE_I;
     s->modified_quant  = 1;
     if (!s->avctx->lowres)