[FFmpeg-cvslog] aacsbr: check sample_rate before using it, fix division by 0

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Tue Nov 20 03:20:43 2012 +0100| [cf5f4c5169639349262aa221ae485a0de188afb1] | committer: Michael Niedermayer

aacsbr: check sample_rate before using it, fix division by 0

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=cf5f4c5169639349262aa221ae485a0de188afb1
---

 libavcodec/aacsbr.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/libavcodec/aacsbr.c b/libavcodec/aacsbr.c
index ceff2ea..8c67a75 100644
--- a/libavcodec/aacsbr.c
+++ b/libavcodec/aacsbr.c
@@ -340,9 +340,6 @@ static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr,
     } else
         temp = 5000;
 
-    start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
-    stop_min  = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
-
     switch (sbr->sample_rate) {
     case 16000:
         sbr_offset_ptr = sbr_offset[0];
@@ -368,6 +365,9 @@ static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr,
         return -1;
     }
 
+    start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
+    stop_min  = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
+
     sbr->k[0] = start_min + sbr_offset_ptr[spectrum->bs_start_freq];
 
     if (spectrum->bs_stop_freq < 14) {