Revision d42dc217 libavcodec/iirfilter.c

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libavcodec/iirfilter.c
47 47 
/// maximum supported filter order
48 48 
#define MAXORDER 30
49 49 

  		




  50
  
  
    
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
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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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