*/
/**
- * @file iirfilter.h
+ * @file
* IIR filter interface
*/
-#ifndef FFMPEG_IIRFILTER_H
-#define FFMPEG_IIRFILTER_H
+#ifndef AVCODEC_IIRFILTER_H
+#define AVCODEC_IIRFILTER_H
#include "avcodec.h"
enum IIRFilterType{
FF_FILTER_TYPE_BESSEL,
+ FF_FILTER_TYPE_BIQUAD,
FF_FILTER_TYPE_BUTTERWORTH,
FF_FILTER_TYPE_CHEBYSHEV,
FF_FILTER_TYPE_ELLIPTIC,
/**
* Initialize filter coefficients.
*
+ * @param avc a pointer to an arbitrary struct of which the first
+ * field is a pointer to an AVClass struct
* @param filt_type filter type (e.g. Butterworth)
* @param filt_mode filter mode (e.g. lowpass)
* @param order filter order
*
* @return pointer to filter coefficients structure or NULL if filter cannot be created
*/
-struct FFIIRFilterCoeffs* ff_iir_filter_init_coeffs(enum IIRFilterType filt_type,
- enum IIRFilterMode filt_mode,
- int order, float cutoff_ratio,
- float stopband, float ripple);
+struct FFIIRFilterCoeffs* ff_iir_filter_init_coeffs(void *avc,
+ enum IIRFilterType filt_type,
+ enum IIRFilterMode filt_mode,
+ int order, float cutoff_ratio,
+ float stopband, float ripple);
/**
* Create new filter state.
void ff_iir_filter_free_state(struct FFIIRFilterState *state);
/**
- * Perform lowpass filtering on input samples.
+ * Perform IIR filtering on signed 16-bit input samples.
*
* @param coeffs pointer to filter coefficients
* @param state pointer to filter state
void ff_iir_filter(const struct FFIIRFilterCoeffs *coeffs, struct FFIIRFilterState *state,
int size, const int16_t *src, int sstep, int16_t *dst, int dstep);
-#endif /* FFMPEG_IIRFILTER_H */
+/**
+ * Perform IIR filtering on floating-point input samples.
+ *
+ * @param coeffs pointer to filter coefficients
+ * @param state pointer to filter state
+ * @param size input length
+ * @param src source samples
+ * @param sstep source stride
+ * @param dst filtered samples (destination may be the same as input)
+ * @param dstep destination stride
+ */
+void ff_iir_filter_flt(const struct FFIIRFilterCoeffs *coeffs,
+ struct FFIIRFilterState *state, int size,
+ const float *src, int sstep, float *dst, int dstep);
+
+#endif /* AVCODEC_IIRFILTER_H */