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avcodec/cfhd, cfhddata: Simplify check for escape

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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@gmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
This commit is contained in:
Andreas Rheinhardt 2022-09-03 16:39:46 +02:00
parent 2ed5925e26
commit 6b1a7fc8bd
2 changed files with 4 additions and 4 deletions
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4
libavcodec/cfhd.c
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@ -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;

4
libavcodec/cfhddata.c
View File

@ -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] = {