Add function ff_iir_filter_flt() to accept floating-point input and output.

Signed-off-by: Mans Rullgard <mans@mansr.com>

1 files changed, 16 insertions, 1 deletions

diff --git a/libavcodec/iirfilter.h b/libavcodec/iirfilter.h
index f660955403..fd26166862 100644
--- a/libavcodec/iirfilter.h
+++ b/libavcodec/iirfilter.h
@@ -87,7 +87,7 @@ void ff_iir_filter_free_coeffs(struct FFIIRFilterCoeffs *coeffs);
 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
@@ -100,4 +100,19 @@ void ff_iir_filter_free_state(struct FFIIRFilterState *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);
 
+/**
+ * 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, void *dst, int dstep);
+
 #endif /* AVCODEC_IIRFILTER_H */