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 90dfe20..cd5958c 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;
--
2.8.1
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