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swr: scale data down in noise shaping to avoid cliping

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Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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Michael Niedermayer 2013-01-10 01:28:24 +01:00
parent 0b60fc94aa
commit 2672b2c1d2
1 changed files with 1 additions and 0 deletions
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libswresample/dither.c
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@ -106,6 +106,7 @@ int swri_dither_init(SwrContext *s, enum AVSampleFormat out_fmt, enum AVSampleFo
s->dither.ns_taps = f->len; s->dither.ns_taps = f->len;
for (j=0; j<f->len; j++) for (j=0; j<f->len; j++)
s->dither.ns_coeffs[j] = f->coefs[j]; s->dither.ns_coeffs[j] = f->coefs[j];
s->dither.ns_scale_1 *= 1 - exp(f->gain_cB * M_LN10 * 0.005) * 2 / (1<<(8*av_get_bytes_per_sample(out_fmt)));
break; break;
} }
} }