[FFmpeg-cvslog] avcodec/cfhd, cfhddata: Simplify check for escape

[Andreas Rheinhardt]

ffmpeg | branch: master | Andreas Rheinhardt <andreas.rheinhardt at outlook.com> | Sat Sep  3 16:39:46 2022 +0200| [6b1a7fc8bd473aa4e644a64335eb93044647f96d] | committer: Andreas Rheinhardt

avcodec/cfhd, cfhddata: Simplify check for escape

cfhd.c checked for level being equal to a certain codebook-
dependent constant and to run being two. The first check is
actually redundant, as all codebooks contain only one (real)
entry with run == 2 (as is usual with VLCs, this one real entry
has several corresponding entries in the table). But given
that no entry has a run of zero (except incomplete entries
which just signal that one needs to do another round of parsing),
one can actually use that as sentinel. This patch does so.

Reviewed-by: Paul B Mahol <onemda at gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at outlook.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=6b1a7fc8bd473aa4e644a64335eb93044647f96d
---

 libavcodec/cfhd.c     | 4 ++--
 libavcodec/cfhddata.c | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/libavcodec/cfhd.c b/libavcodec/cfhd.c
index 7afbbac59e..90b3d0a850 100644
--- a/libavcodec/cfhd.c
+++ b/libavcodec/cfhd.c
@@ -819,7 +819,7 @@ static int cfhd_decode(AVCodecContext *avctx, AVFrame *pic,
                                    VLC_BITS, 3, 1);
 
                         /* escape */
-                        if (level == 64 && run == 2)
+                        if (!run)
                             break;
 
                         count += run;
@@ -850,7 +850,7 @@ static int cfhd_decode(AVCodecContext *avctx, AVFrame *pic,
                                    VLC_BITS, 3, 1);
 
                         /* escape */
-                        if (level == 255 && run == 2)
+                        if (!run)
                             break;
 
                         count += run;
diff --git a/libavcodec/cfhddata.c b/libavcodec/cfhddata.c
index 67bd8e66db..212dccadb9 100644
--- a/libavcodec/cfhddata.c
+++ b/libavcodec/cfhddata.c
@@ -72,7 +72,7 @@ static const uint16_t table_9_vlc_run[NB_VLC_TABLE_9] = {
     1,    1,    1,    1,    1,    1,    1,    1,
     1,    1,    1,    1,    1,    1,    1,    1,
     1,    1,    1,    1,    1,    1,    1,    1,
-    1,    2,
+    1,    0,
 };
 
 static const uint8_t table_9_vlc_level[NB_VLC_TABLE_9] = {
@@ -226,7 +226,7 @@ static const uint16_t table_18_vlc_run[NB_VLC_TABLE_18] = {
      1,    1,    1,    1,    1,    1,    1,    1,
      1,    1,    1,    1,    1,    1,    1,    1,
      1,    1,    1,    1,    1,    1,    1,    1,
-     1,    1,    1,    1,    1,    1,    1,    2,
+     1,    1,    1,    1,    1,    1,    1,    0,
 };
 
 static const uint8_t table_18_vlc_level[NB_VLC_TABLE_18] = {