avcodec/qdm2: Apply offsets when initializing VLCs

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

libavcodec/qdm2.c

@@ -205,7 +205,7 @@ static int qdm2_get_vlc(GetBitContext *gb, const VLC *vlc, int flag, int depth)
     value = get_vlc2(gb, vlc->table, vlc->bits, depth);
 
     /* stage-2, 3 bits exponent escape sequence */
-    if (value-- == 0)
+    if (value < 0)
         value = get_bits(gb, get_bits(gb, 3) + 1);
 
     /* stage-3, optional */

libavcodec/qdm2_tablegen.h

@@ -122,7 +122,7 @@ static av_cold void build_vlc(VLC *vlc, int nb_bits, int nb_codes, int idx,
     vlc->table_allocated = qdm2_vlc_offs[idx + 1] - qdm2_vlc_offs[idx];
     ff_init_vlc_from_lengths(vlc, nb_bits, nb_codes,
                              &tab[0][1], 2, &tab[0][0], 2, 1,
-                             0, INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE, NULL);
+                             -1, INIT_VLC_USE_NEW_STATIC | INIT_VLC_LE, NULL);
 }
 
 static av_cold void qdm2_init_vlc(void)