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swr/dither: fix division by 0
Found-by: Daemon404 Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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@ -97,7 +97,7 @@ int swri_dither_init(SwrContext *s, enum AVSampleFormat out_fmt, enum AVSampleFo
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s->dither.ns_pos = 0;
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s->dither.noise_scale= scale;
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s->dither.ns_scale = scale;
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s->dither.ns_scale_1 = 1/scale;
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s->dither.ns_scale_1 = scale ? 1/scale : 0;
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memset(s->dither.ns_errors, 0, sizeof(s->dither.ns_errors));
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for (i=0; filters[i].coefs; i++) {
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const filter_t *f = &filters[i];
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