Revision d42dc217
libavcodec/iirfilter.c | ||
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47 | 47 |
/// maximum supported filter order |
48 | 48 |
#define MAXORDER 30 |
49 | 49 |
|
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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, |
|
51 | 52 |
enum IIRFilterMode filt_mode, |
52 | 53 |
int order, float cutoff_ratio, |
53 | 54 |
float stopband, float ripple) |
... | ... | |
62 | 63 |
if(order <= 1 || (order & 1) || order > MAXORDER || cutoff_ratio >= 1.0) |
63 | 64 |
return NULL; |
64 | 65 |
|
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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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68 | 72 |
c->order = order; |
69 | 73 |
|
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wa = 2 * tan(M_PI * 0.5 * cutoff_ratio); |
... | ... | |
110 | 114 |
c->gain /= 1 << order; |
111 | 115 |
|
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return c; |
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|
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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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|
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av_cold struct FFIIRFilterState* ff_iir_filter_init_state(int order) |
libavcodec/iirfilter.h | ||
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49 | 49 |
/** |
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* Initialize filter coefficients. |
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* |
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* @param avc a pointer to an arbitrary struct of which the first |
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* field is a pointer to an AVClass struct |
|
52 | 54 |
* @param filt_type filter type (e.g. Butterworth) |
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* @param filt_mode filter mode (e.g. lowpass) |
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* @param order filter order |
... | ... | |
58 | 60 |
* |
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* @return pointer to filter coefficients structure or NULL if filter cannot be created |
60 | 62 |
*/ |
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struct FFIIRFilterCoeffs* ff_iir_filter_init_coeffs(enum IIRFilterType filt_type, |
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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, |
64 | 67 |
float stopband, float ripple); |
libavcodec/psymodel.c | ||
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88 | 88 |
cutoff_coeff = 2.0 * avctx->cutoff / avctx->sample_rate; |
89 | 89 |
|
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if (cutoff_coeff) |
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ctx->fcoeffs = ff_iir_filter_init_coeffs(FF_FILTER_TYPE_BUTTERWORTH, FF_FILTER_MODE_LOWPASS, |
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ctx->fcoeffs = ff_iir_filter_init_coeffs(avctx, FF_FILTER_TYPE_BUTTERWORTH, FF_FILTER_MODE_LOWPASS,
|
|
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FILT_ORDER, cutoff_coeff, 0.0, 0.0); |
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if (ctx->fcoeffs) { |
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ctx->fstate = av_mallocz(sizeof(ctx->fstate[0]) * avctx->channels); |
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