shorten: fix lossy decoding

Closes #1299, #1300 and #1301. Signed-off-by: Paul B Mahol <onemda@gmail.com>
13 years ago · 672f8226bb
parent 27127ebe6c
commit 672f8226bb
1 changed files with 1 additions and 1 deletions
--- a/libavcodec/shorten.c
+++ b/libavcodec/shorten.c
@ -539,7 +539,7 @@ static int shorten_decode_frame(AVCodecContext *avctx, void *data,
                    sum += s->offset[channel][i];
                coffset = sum / s->nmean;
                if (s->version >= 2)
-                    coffset >>= FFMIN(1, s->bitshift);
+                    coffset = s->bitshift == 0 ? coffset : coffset >> s->bitshift - 1 >> 1;
            }

            /* decode samples for this channel */