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[FFmpeg-devel,3/3] avcodec/on2avc: Use least max_depth for get_vlc2()

Message ID 20201018064004.667741-3-andreas.rheinhardt@gmail.com
State Accepted
Commit bce8e2f374db390d50ec79a6288a607782cca64a
Headers show
Series [FFmpeg-devel,1/3] avcodec/on2avcdata: Deduplicate symbol tables
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Commit Message

Andreas Rheinhardt Oct. 18, 2020, 6:40 a.m. UTC
The longest codes of any VLC codebooks are 18 bits long and the VLC
tables itself use 9 bits; therefore it is sufficient to read twice from
the table, yet this has been done thrice.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
---
 libavcodec/on2avc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/libavcodec/on2avc.c b/libavcodec/on2avc.c
index e54c23cb1c..625e733ca3 100644
--- a/libavcodec/on2avc.c
+++ b/libavcodec/on2avc.c
@@ -195,7 +195,7 @@  static int on2avc_decode_quads(On2AVCContext *c, GetBitContext *gb, float *dst,
     int i, j, val, val1;
 
     for (i = 0; i < dst_size; i += 4) {
-        val = get_vlc2(gb, c->cb_vlc[type].table, 9, 3);
+        val = get_vlc2(gb, c->cb_vlc[type].table, 9, 2);
 
         for (j = 0; j < 4; j++) {
             val1 = sign_extend((val >> (12 - j * 4)) & 0xF, 4);
@@ -228,7 +228,7 @@  static int on2avc_decode_pairs(On2AVCContext *c, GetBitContext *gb, float *dst,
     int i, val, val1, val2, sign;
 
     for (i = 0; i < dst_size; i += 2) {
-        val = get_vlc2(gb, c->cb_vlc[type].table, 9, 3);
+        val = get_vlc2(gb, c->cb_vlc[type].table, 9, 2);
 
         val1 = sign_extend(val >> 8,   8);
         val2 = sign_extend(val & 0xFF, 8);