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psymodel: dont apply lowpass filters with a cutoff close to the nyquist

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The IIR filter numerically diverges in such cases, this could easily be
fixed but would make the filter slower on some platforms

Fixes Ticket2246

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit fee5da6b0a)
This commit is contained in:
Michael Niedermayer
2013-03-07 19:28:30 +01:00
committed by Carl Eugen Hoyos
parent b642e45d8c
commit 088ba9bc3e
1 changed files with 1 additions and 1 deletions
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libavcodec/psymodel.c
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@@ -106,7 +106,7 @@ av_cold struct FFPsyPreprocessContext* ff_psy_preprocess_init(AVCodecContext *av
if (!cutoff_coeff && avctx->codec_id == AV_CODEC_ID_AAC) if (!cutoff_coeff && avctx->codec_id == AV_CODEC_ID_AAC)
cutoff_coeff = 2.0 * AAC_CUTOFF(avctx) / avctx->sample_rate; cutoff_coeff = 2.0 * AAC_CUTOFF(avctx) / avctx->sample_rate;
if (cutoff_coeff) if (cutoff_coeff && cutoff_coeff < 0.98)
ctx->fcoeffs = ff_iir_filter_init_coeffs(avctx, FF_FILTER_TYPE_BUTTERWORTH, ctx->fcoeffs = ff_iir_filter_init_coeffs(avctx, FF_FILTER_TYPE_BUTTERWORTH,
FF_FILTER_MODE_LOWPASS, FILT_ORDER, FF_FILTER_MODE_LOWPASS, FILT_ORDER,
cutoff_coeff, 0.0, 0.0); cutoff_coeff, 0.0, 0.0);