[FFmpeg-cvslog] g723_1: clip argument for 15-bit version of normalize_bits()

[Kostya Shishkov]

ffmpeg | branch: master | Kostya Shishkov <kostya.shishkov at gmail.com> | Tue Aug  7 19:32:20 2012 +0200| [e78e6c37efc98189c4c3d89acd3265d7a7ba6d05] | committer: Kostya Shishkov

g723_1: clip argument for 15-bit version of normalize_bits()

It expects maximum value to be 32767 but calculations in scale_vector()
which uses this function can give it ABS(-32768) which leads to wrong
result and thus clipping is needed.

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=e78e6c37efc98189c4c3d89acd3265d7a7ba6d05
---

 libavcodec/g723_1.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/libavcodec/g723_1.c b/libavcodec/g723_1.c
index aabb03d..e917f5a 100644
--- a/libavcodec/g723_1.c
+++ b/libavcodec/g723_1.c
@@ -290,6 +290,7 @@ static int scale_vector(int16_t *vector, int length)
     for (i = 0; i < length; i++)
         max = FFMAX(max, FFABS(vector[i]));
 
+    max   = FFMIN(max, 0x7FFF);
     bits  = normalize_bits(max, 15);
     scale = (bits == 15) ? 0x7FFF : (1 << bits);