avcodec/rl: Allow to create only a few VLC tables

It is not uncommon that only the first one is used; this is similar to
ff_init_2d_vlc_rl().

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

1 files changed, 3 insertions, 0 deletions

diff --git a/libavcodec/rl.c b/libavcodec/rl.c
index c532b5bf56..93153ff723 100644
--- a/libavcodec/rl.c
+++ b/libavcodec/rl.c
@@ -80,6 +80,9 @@ av_cold void ff_rl_init_vlc(RLTable *rl, unsigned static_size)
         int qmul = q * 2;
         int qadd = (q - 1) | 1;
 
+        if (!rl->rl_vlc[q])
+            return;
+
         if (q == 0) {
             qmul = 1;
             qadd = 0;