[FFmpeg-cvslog] avcodec/ac3enc: Fix invalid shift

[Andreas Rheinhardt]

ffmpeg | branch: release/4.2 | Andreas Rheinhardt <andreas.rheinhardt at gmail.com> | Fri Sep 20 00:17:06 2019 +0200| [93a8f6d34e4bec182bfa7d0960955e210ba55ae7] | committer: Andreas Rheinhardt

avcodec/ac3enc: Fix invalid shift

Fixes the FATE-tests unknown_layout-ac3, ac3-fixed-encode, ac3-encode
and eac3-encode. It furthermore fixes the ac3-encoder bugs mentioned in
tickets #7994, #8144 and #8159.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>
Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 2f289ec914cc7e8133858d4f9e8d91dab685ae44)

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=93a8f6d34e4bec182bfa7d0960955e210ba55ae7
---

 libavcodec/ac3enc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/ac3enc.c b/libavcodec/ac3enc.c
index f1c95ce877..76872a8fe0 100644
--- a/libavcodec/ac3enc.c
+++ b/libavcodec/ac3enc.c
@@ -1065,7 +1065,7 @@ static int bit_alloc(AC3EncodeContext *s, int snr_offset)
 {
     int blk, ch;
 
-    snr_offset = (snr_offset - 240) << 2;
+    snr_offset = (snr_offset - 240) * 4;
 
     reset_block_bap(s);
     for (blk = 0; blk < s->num_blocks; blk++) {