[FFmpeg-cvslog] smacker audio: sign-extend the initial 16-bit predicted value

[Franz Brauße]

ffmpeg | branch: release/0.9 | Franz Brauße <dev at karlchenofhell.org> | Fri Mar 30 14:40:14 2012 -0400| [32a79b56493d98532512715689b9fe017a2f2fa2] | committer: Carl Eugen Hoyos

smacker audio: sign-extend the initial 16-bit predicted value

Fixes Bug #265

Signed-off-by: Justin Ruggles <justin.ruggles at gmail.com>
(cherry picked from commit 12cbbbb4abda2de0ea123282ccf7ebee61517f7d)

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=32a79b56493d98532512715689b9fe017a2f2fa2
---

 libavcodec/smacker.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/libavcodec/smacker.c b/libavcodec/smacker.c
index fdc28e1..347e94d 100644
--- a/libavcodec/smacker.c
+++ b/libavcodec/smacker.c
@@ -659,7 +659,7 @@ static int smka_decode_frame(AVCodecContext *avctx, void *data,
     }
     if(bits) { //decode 16-bit data
         for(i = stereo; i >= 0; i--)
-            pred[i] = av_bswap16(get_bits(&gb, 16));
+            pred[i] = sign_extend(av_bswap16(get_bits(&gb, 16)), 16);
         for(i = 0; i <= stereo; i++)
             *samples++ = pred[i];
         for(; i < unp_size / 2; i++) {