[FFmpeg-cvslog] smackaud: use sign_extend() for difference value instead of casting

[Justin Ruggles]

ffmpeg | branch: master | Justin Ruggles <justin.ruggles at gmail.com> | Wed Nov  9 16:19:52 2011 -0500| [c86c3c8017da512591e6a490d447f64dc3d9253f] | committer: Justin Ruggles

smackaud: use sign_extend() for difference value instead of casting

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=c86c3c8017da512591e6a490d447f64dc3d9253f
---

 libavcodec/smacker.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/libavcodec/smacker.c b/libavcodec/smacker.c
index d8a3d77..7013aa1 100644
--- a/libavcodec/smacker.c
+++ b/libavcodec/smacker.c
@@ -33,6 +33,7 @@
 
 #include "avcodec.h"
 #include "libavutil/audioconvert.h"
+#include "mathops.h"
 
 #define ALT_BITSTREAM_READER_LE
 #include "get_bits.h"
@@ -655,7 +656,7 @@ static int smka_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
                 else
                     res = 0;
                 val |= h[3].values[res] << 8;
-                pred[1] += (int16_t)val;
+                pred[1] += sign_extend(val, 16);
                 *samples++ = pred[1];
             } else {
                 if(vlc[0].table)
@@ -668,7 +669,7 @@ static int smka_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
                 else
                     res = 0;
                 val |= h[1].values[res] << 8;
-                pred[0] += val;
+                pred[0] += sign_extend(val, 16);
                 *samples++ = pred[0];
             }
         }
@@ -683,14 +684,14 @@ static int smka_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
                     res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
                 else
                     res = 0;
-                pred[1] += (int8_t)h[1].values[res];
+                pred[1] += sign_extend(h[1].values[res], 8);
                 *samples8++ = pred[1];
             } else {
                 if(vlc[0].table)
                     res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
                 else
                     res = 0;
-                pred[0] += (int8_t)h[0].values[res];
+                pred[0] += sign_extend(h[0].values[res], 8);
                 *samples8++ = pred[0];
             }
         }