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avcodec/aacenc: Avoid 0 lambda
Fixes: Ticket8003 Fixes: CVE-2020-20453 Signed-off-by: Michael Niedermayer <michael@niedermayer.cc> (cherry picked from commit a7a7f32c8ad0179a1a85d0a8cff35924e6d90be8) Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -28,6 +28,7 @@
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* TODOs:
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* add sane pulse detection
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***********************************/
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#include <float.h>
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#include "libavutil/libm.h"
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#include "libavutil/thread.h"
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@ -808,7 +809,7 @@ static int aac_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
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/* Not so fast though */
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ratio = sqrtf(ratio);
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}
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s->lambda = FFMIN(s->lambda * ratio, 65536.f);
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s->lambda = av_clipf(s->lambda * ratio, FLT_MIN, 65536.f);
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/* Keep iterating if we must reduce and lambda is in the sky */
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if (ratio > 0.9f && ratio < 1.1f) {
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