From 33d7f822f8ed2d1870babc1d04d4d48cf8b6f240 Mon Sep 17 00:00:00 2001 From: "Ronald S. Bultje" Date: Tue, 20 Dec 2016 18:01:05 -0500 Subject: [PATCH] wmavoice: protect against zero-energy in adaptive gain control. Otherwise the scale factor becomes NaN, resulting in corrupt output. Fixes #5426. --- libavcodec/wmavoice.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/libavcodec/wmavoice.c b/libavcodec/wmavoice.c index 90dfe20240..cd5958c7bc 100644 --- a/libavcodec/wmavoice.c +++ b/libavcodec/wmavoice.c @@ -512,7 +512,8 @@ static void adaptive_gain_control(float *out, const float *in, speech_energy += fabsf(speech_synth[i]); postfilter_energy += fabsf(in[i]); } - gain_scale_factor = (1.0 - alpha) * speech_energy / postfilter_energy; + gain_scale_factor = postfilter_energy == 0.0 ? 0.0 : + (1.0 - alpha) * speech_energy / postfilter_energy; for (i = 0; i < size; i++) { mem = alpha * mem + gain_scale_factor;