Revision d42dc217 libavcodec/iirfilter.c
libavcodec/iirfilter.c | ||
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/// maximum supported filter order |
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#define MAXORDER 30 |
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av_cold struct FFIIRFilterCoeffs* ff_iir_filter_init_coeffs(enum IIRFilterType filt_type, |
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av_cold struct FFIIRFilterCoeffs* ff_iir_filter_init_coeffs(void *avc, |
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enum IIRFilterType filt_type, |
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enum IIRFilterMode filt_mode, |
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int order, float cutoff_ratio, |
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float stopband, float ripple) |
... | ... | |
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if(order <= 1 || (order & 1) || order > MAXORDER || cutoff_ratio >= 1.0) |
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return NULL; |
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c = av_malloc(sizeof(FFIIRFilterCoeffs)); |
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c->cx = av_malloc(sizeof(c->cx[0]) * ((order >> 1) + 1)); |
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c->cy = av_malloc(sizeof(c->cy[0]) * order); |
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FF_ALLOCZ_OR_GOTO(avc, c, sizeof(FFIIRFilterCoeffs), |
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init_fail); |
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FF_ALLOC_OR_GOTO (avc, c->cx, sizeof(c->cx[0]) * ((order >> 1) + 1), |
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init_fail); |
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FF_ALLOC_OR_GOTO (avc, c->cy, sizeof(c->cy[0]) * order, |
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init_fail); |
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c->order = order; |
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wa = 2 * tan(M_PI * 0.5 * cutoff_ratio); |
... | ... | |
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c->gain /= 1 << order; |
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return c; |
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init_fail: |
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ff_iir_filter_free_coeffs(c); |
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return NULL; |
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} |
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av_cold struct FFIIRFilterState* ff_iir_filter_init_state(int order) |
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