demux: libmp4: add vc1 atom parsing restrictions

modules/demux/mp4/libmp4.c

@@ -3739,7 +3739,7 @@ static const struct
     { ATOM_hvcC,    MP4_ReadBox_Binary,       0 },
     { ATOM_dac3,    MP4_ReadBox_dac3,         0 },
     { ATOM_dec3,    MP4_ReadBox_dec3,         0 },
-    { ATOM_dvc1,    MP4_ReadBox_dvc1,         0 },
+    { ATOM_dvc1,    MP4_ReadBox_dvc1,         ATOM_vc1  },
     { ATOM_fiel,    MP4_ReadBox_fiel,         0 },
     { ATOM_glbl,    MP4_ReadBox_Binary,       ATOM_FFV1 },
     { ATOM_enda,    MP4_ReadBox_enda,         0 },
@@ -3841,6 +3841,7 @@ static const struct
     { ATOM_h264,    MP4_ReadBox_sample_vide,  ATOM_stsd },
 
     { ATOM_jpeg,    MP4_ReadBox_sample_vide,  ATOM_stsd },
+    { ATOM_vc1,     MP4_ReadBox_sample_vide,  ATOM_stsd },
     { ATOM_avc1,    MP4_ReadBox_sample_vide,  ATOM_stsd },
     { ATOM_avc3,    MP4_ReadBox_sample_vide,  ATOM_stsd },
 

modules/demux/mp4/libmp4.h

@@ -162,6 +162,7 @@ typedef int64_t stime_t;
 #define ATOM_eac3 VLC_FOURCC( 'e', 'c', '-', '3' )
 #define ATOM_dac3 VLC_FOURCC( 'd', 'a', 'c', '3' )
 #define ATOM_dec3 VLC_FOURCC( 'd', 'e', 'c', '3' )
+#define ATOM_vc1  VLC_FOURCC( 'v', 'c', '-', '1' )
 #define ATOM_dvc1 VLC_FOURCC( 'd', 'v', 'c', '1' )
 #define ATOM_WMA2 VLC_FOURCC( 'W', 'M', 'A', '2' )
 #define ATOM_wma  VLC_FOURCC( 'w', 'm', 'a', ' ' )