X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavcodec%2Fvc1.c;h=775caa69f8e46dd807f3cefbe9bc07a405cf1b19;hb=7a1723086a9cc72c2f3e1e682b002ed3d81990d3;hp=7c4eb2e1570c6d13baa410c6e0c8b6089786dcfd;hpb=8e576d58306df95d6373dd0ca2c1f21f1afaeca9;p=ffmpeg

diff --git a/libavcodec/vc1.c b/libavcodec/vc1.c
index 7c4eb2e1570..775caa69f8e 100644
--- a/libavcodec/vc1.c
+++ b/libavcodec/vc1.c
@@ -825,10 +825,10 @@ int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
     int scale, shift, i; /* for initializing LUT for intensity compensation */
 
     v->numref=0;
-    v->fcm=0;
-    v->field_mode=0;
     v->p_frame_skipped = 0;
     if (v->second_field) {
+        if(v->fcm!=2 || v->field_mode!=1)
+            return -1;
         v->s.pict_type = (v->fptype & 1) ? AV_PICTURE_TYPE_P : AV_PICTURE_TYPE_I;
         if (v->fptype & 4)
             v->s.pict_type = (v->fptype & 1) ? AV_PICTURE_TYPE_BI : AV_PICTURE_TYPE_B;
@@ -841,14 +841,14 @@ int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
     if (v->interlace) {
         v->fcm = decode012(gb);
         if (v->fcm) {
-            if (v->fcm == 2)
+            if (v->fcm == ILACE_FIELD)
                 v->field_mode = 1;
             if (!v->warn_interlaced++)
                 av_log(v->s.avctx, AV_LOG_ERROR,
                        "Interlaced frames/fields support is incomplete\n");
         }
     } else {
-        v->fcm = 0;
+        v->fcm = PROGRESSIVE;
     }
 
     if (v->field_mode) {
@@ -896,6 +896,8 @@ int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
     v->rnd = get_bits1(gb);
     if (v->interlace)
         v->uvsamp = get_bits1(gb);
+    if(!ff_vc1_bfraction_vlc.table)
+        return 0; //parsing only, vlc tables havnt been allocated
     if (v->field_mode) {
         if (!v->refdist_flag)
             v->refdist = 0;
@@ -962,7 +964,7 @@ int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
     switch (v->s.pict_type) {
     case AV_PICTURE_TYPE_I:
     case AV_PICTURE_TYPE_BI:
-        if (v->fcm == 1) { //interlace frame picture
+        if (v->fcm == ILACE_FRAME) { //interlace frame picture
             status = bitplane_decoding(v->fieldtx_plane, &v->fieldtx_is_raw, v);
             if (status < 0)
                 return -1;
@@ -1003,7 +1005,7 @@ int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
                 v->dmvrange = get_unary(gb, 0, 3);
             else
                 v->dmvrange = 0;
-            if (v->fcm == 1) { // interlaced frame picture
+            if (v->fcm == ILACE_FRAME) { // interlaced frame picture
                 v->fourmvswitch = get_bits1(gb);
                 v->intcomp      = get_bits1(gb);
                 if (v->intcomp) {
@@ -1043,7 +1045,7 @@ int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
             v->tt_index = 1;
         else
             v->tt_index = 2;
-        if (v->fcm != 1) {
+        if (v->fcm != ILACE_FRAME) {
             int mvmode;
             mvmode     = get_unary(gb, 1, 4);
             lowquant   = (v->pq > 12) ? 0 : 1;
@@ -1078,7 +1080,7 @@ int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
                            || (v->mv_mode == MV_PMODE_INTENSITY_COMP
                                && v->mv_mode2 == MV_PMODE_1MV_HPEL_BILIN));
         }
-        if (v->fcm == 0) { // progressive
+        if (v->fcm == PROGRESSIVE) { // progressive
             if ((v->mv_mode == MV_PMODE_INTENSITY_COMP &&
                  v->mv_mode2 == MV_PMODE_MIXED_MV)
                 || v->mv_mode == MV_PMODE_MIXED_MV) {
@@ -1100,7 +1102,7 @@ int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
             /* Hopefully this is correct for P frames */
             v->s.mv_table_index = get_bits(gb, 2); //but using ff_vc1_ tables
             v->cbpcy_vlc        = &ff_vc1_cbpcy_p_vlc[get_bits(gb, 2)];
-        } else if (v->fcm == 1) { // frame interlaced
+        } else if (v->fcm == ILACE_FRAME) { // frame interlaced
             v->qs_last          = v->s.quarter_sample;
             v->s.quarter_sample = 1;
             v->s.mspel          = 1;
@@ -1140,7 +1142,7 @@ int vc1_parse_frame_header_adv(VC1Context *v, GetBitContext* gb)
         break;
     case AV_PICTURE_TYPE_B:
         // TODO: implement interlaced frame B picture decoding
-        if (v->fcm == 1)
+        if (v->fcm == ILACE_FRAME)
             return -1;
         if (v->extended_mv)
             v->mvrange = get_unary(gb, 0, 3);