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avfilter/af_loudnorm: fix incorrect gain when audio is shorter than 3s

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The input data is multiplied by `s->offset` to get normalized output.
`s->target_tp` and `true_peak` is not in dB,
so `s->offset` should be calculated by division instead of subtraction.

Signed-off-by: Rui Zhu <real.zhurui@gmail.com>
This commit is contained in:
Rui Zhu 2022-08-31 20:51:06 +08:00 committed by Paul B Mahol
parent 86157f5a25
commit 36572a0c1d
1 changed files with 1 additions and 1 deletions
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libavfilter/af_loudnorm.c
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@ -455,7 +455,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
offset = pow(10., (s->target_i - global) / 20.);
offset_tp = true_peak * offset;
s->offset = offset_tp < s->target_tp ? offset : s->target_tp - true_peak;
s->offset = offset_tp < s->target_tp ? offset : s->target_tp / true_peak;
s->frame_type = LINEAR_MODE;
}