[FFmpeg-cvslog] swresample/swresample: Fix integer overflow in seed calculation

[Michael Niedermayer]

ffmpeg | branch: release/2.7 | Michael Niedermayer <michael at niedermayer.cc> | Thu Sep  3 09:22:31 2015 +0200| [95db0aa276feca1e818c59f9905927a5932e881c] | committer: Michael Niedermayer

swresample/swresample: Fix integer overflow in seed calculation

Fixes CID1322333

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>
(cherry picked from commit 32f53958b8f6ed4c3c2a7447c1e47d012796fae2)

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=95db0aa276feca1e818c59f9905927a5932e881c
---

 libswresample/swresample.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libswresample/swresample.c b/libswresample/swresample.c
index 693a403..400b529 100644
--- a/libswresample/swresample.c
+++ b/libswresample/swresample.c
@@ -643,7 +643,7 @@ static int swr_convert_internal(struct SwrContext *s, AudioData *out, int out_co
                 return ret;
             if(ret)
                 for(ch=0; ch<s->dither.noise.ch_count; ch++)
-                    if((ret=swri_get_dither(s, s->dither.noise.ch[ch], s->dither.noise.count, 12345678913579<<ch, s->dither.noise.fmt))<0)
+                    if((ret=swri_get_dither(s, s->dither.noise.ch[ch], s->dither.noise.count, (12345678913579ULL*ch + 3141592) % 2718281828U, s->dither.noise.fmt))<0)
                         return ret;
             av_assert0(s->dither.noise.ch_count == preout->ch_count);