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wmavoice: protect against zero-energy in adaptive gain control.

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Otherwise the scale factor becomes NaN, resulting in corrupt output.
Fixes #5426.
This commit is contained in:
Ronald S. Bultje 2016-12-20 18:01:05 -05:00
parent 7b27dd5c16
commit 33d7f822f8
1 changed files with 2 additions and 1 deletions
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libavcodec/wmavoice.c
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@ -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;