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avfilter/af_aiir: normalize biquads only if divisor is big enough
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@ -601,18 +601,22 @@ static int decompose_zp2biquads(AVFilterContext *ctx, int channels)
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iir->biquads[current_biquad].b[1] = b[2] / a[4];
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iir->biquads[current_biquad].b[1] = b[2] / a[4];
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iir->biquads[current_biquad].b[2] = b[0] / a[4];
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iir->biquads[current_biquad].b[2] = b[0] / a[4];
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factor = (iir->biquads[current_biquad].a[0] +
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if (fabs(iir->biquads[current_biquad].b[0] +
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iir->biquads[current_biquad].a[1] +
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iir->biquads[current_biquad].b[1] +
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iir->biquads[current_biquad].a[2]) /
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iir->biquads[current_biquad].b[2]) > 1e-6) {
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(iir->biquads[current_biquad].b[0] +
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factor = (iir->biquads[current_biquad].a[0] +
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iir->biquads[current_biquad].b[1] +
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iir->biquads[current_biquad].a[1] +
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iir->biquads[current_biquad].b[2]);
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iir->biquads[current_biquad].a[2]) /
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(iir->biquads[current_biquad].b[0] +
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iir->biquads[current_biquad].b[1] +
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iir->biquads[current_biquad].b[2]);
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av_log(ctx, AV_LOG_VERBOSE, "factor=%f\n", factor);
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av_log(ctx, AV_LOG_VERBOSE, "factor=%f\n", factor);
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iir->biquads[current_biquad].b[0] *= factor;
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iir->biquads[current_biquad].b[0] *= factor;
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iir->biquads[current_biquad].b[1] *= factor;
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iir->biquads[current_biquad].b[1] *= factor;
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iir->biquads[current_biquad].b[2] *= factor;
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iir->biquads[current_biquad].b[2] *= factor;
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}
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iir->biquads[current_biquad].b[0] *= (current_biquad ? 1.0 : iir->g);
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iir->biquads[current_biquad].b[0] *= (current_biquad ? 1.0 : iir->g);
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iir->biquads[current_biquad].b[1] *= (current_biquad ? 1.0 : iir->g);
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iir->biquads[current_biquad].b[1] *= (current_biquad ? 1.0 : iir->g);
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