[FFmpeg-cvslog] avcodec/aaccoder: Add minimal bias in search_for_ms()

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Mon May 31 21:00:32 2021 +0200| [75a099fc734a4ee2b1347d0a3d8c53d883b95174] | committer: Michael Niedermayer

avcodec/aaccoder: Add minimal bias in search_for_ms()

Fixes: floating point division by 0
Fixes: Ticket8218

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=75a099fc734a4ee2b1347d0a3d8c53d883b95174
---

 libavcodec/aaccoder.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/libavcodec/aaccoder.c b/libavcodec/aaccoder.c
index baa82489b1..11b0559e1c 100644
--- a/libavcodec/aaccoder.c
+++ b/libavcodec/aaccoder.c
@@ -843,25 +843,25 @@ static void search_for_ms(AACEncContext *s, ChannelElement *cpe)
                                                     sce0->ics.swb_sizes[g],
                                                     sce0->sf_idx[w*16+g],
                                                     sce0->band_type[w*16+g],
-                                                    lambda / band0->threshold, INFINITY, &b1, NULL, 0);
+                                                    lambda / (band0->threshold + FLT_MIN), INFINITY, &b1, NULL, 0);
                         dist1 += quantize_band_cost(s, &sce1->coeffs[start + (w+w2)*128],
                                                     R34,
                                                     sce1->ics.swb_sizes[g],
                                                     sce1->sf_idx[w*16+g],
                                                     sce1->band_type[w*16+g],
-                                                    lambda / band1->threshold, INFINITY, &b2, NULL, 0);
+                                                    lambda / (band1->threshold + FLT_MIN), INFINITY, &b2, NULL, 0);
                         dist2 += quantize_band_cost(s, M,
                                                     M34,
                                                     sce0->ics.swb_sizes[g],
                                                     mididx,
                                                     midcb,
-                                                    lambda / minthr, INFINITY, &b3, NULL, 0);
+                                                    lambda / (minthr + FLT_MIN), INFINITY, &b3, NULL, 0);
                         dist2 += quantize_band_cost(s, S,
                                                     S34,
                                                     sce1->ics.swb_sizes[g],
                                                     sididx,
                                                     sidcb,
-                                                    mslambda / (minthr * bmax), INFINITY, &b4, NULL, 0);
+                                                    mslambda / (minthr * bmax + FLT_MIN), INFINITY, &b4, NULL, 0);
                         B0 += b1+b2;
                         B1 += b3+b4;
                         dist1 -= b1+b2;