avcodec/mpeg4data: Move ff_mpeg4_resync_prefix to its only user

This array is only ever useful to a decoder.
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/mpeg4data.h

@@ -362,10 +362,6 @@ const uint8_t ff_mpeg4_c_dc_scale_table[32]={
     0, 8, 8, 8, 8, 9, 9,10,10,11,11,12,12,13,13,14,14,15,15,16,16,17,17,18,18,19,20,21,22,23,24,25
 };
 
-const uint16_t ff_mpeg4_resync_prefix[8]={
-    0x7F00, 0x7E00, 0x7C00, 0x7800, 0x7000, 0x6000, 0x4000, 0x0000
-};
-
 const uint8_t ff_mpeg4_dc_threshold[8]={
     99, 13, 15, 17, 19, 21, 23, 0
 };

libavcodec/mpeg4videodata.h

@@ -50,7 +50,6 @@ extern const int16_t ff_mpeg4_default_non_intra_matrix[64];
 
 extern const uint8_t ff_mpeg4_y_dc_scale_table[32];
 extern const uint8_t ff_mpeg4_c_dc_scale_table[32];
-extern const uint16_t ff_mpeg4_resync_prefix[8];
 
 extern const uint8_t ff_mpeg4_dc_threshold[8];
 

libavcodec/mpeg4videodec.c

@@ -391,7 +391,11 @@ static inline int mpeg4_is_resync(Mpeg4DecContext *ctx)
         if (v == 0x7F)
             return s->mb_num;
     } else {
-        if (v == ff_mpeg4_resync_prefix[bits_count & 7]) {
+        static const uint16_t mpeg4_resync_prefix[8] = {
+            0x7F00, 0x7E00, 0x7C00, 0x7800, 0x7000, 0x6000, 0x4000, 0x0000
+        };
+
+        if (v == mpeg4_resync_prefix[bits_count & 7]) {
             int len, mb_num;
             int mb_num_bits = av_log2(s->mb_num - 1) + 1;
             GetBitContext gb = s->gb;