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

[Franz Brauße]

ffmpeg | branch: release/0.8 | Franz Brauße <dev at karlchenofhell.org> | Fri Mar 30 14:40:14 2012 -0400| [fb3189ce8b8a5ddc44b460f9fb1b5b4e8ddea2f2] | committer: Reinhard Tartler

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)

Signed-off-by: Anton Khirnov <anton at khirnov.net>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=fb3189ce8b8a5ddc44b460f9fb1b5b4e8ddea2f2
---

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

diff --git a/libavcodec/smacker.c b/libavcodec/smacker.c
index eb4427c..ff2cdeb 100644
--- a/libavcodec/smacker.c
+++ b/libavcodec/smacker.c
@@ -644,7 +644,7 @@ static int smka_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
     }
     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++) {