WMAL: Shift output samples by the specified number of padding zeroes.

[ffmpeg] / libavcodec / iirfilter.h

diff --git a/libavcodec/iirfilter.h b/libavcodec/iirfilter.h
index e6010390cbfe144ee31b8eb9cc728d4df0759f12..bc65a96b59bd67782c0799024f4bee207066cc38 100644 (file)
--- a/libavcodec/iirfilter.h
+++ b/libavcodec/iirfilter.h
@@ -2,25 +2,25 @@
  * IIR filter
  * Copyright (c) 2008 Konstantin Shishkov
  *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
  *
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 /**
- * @file libavcodec/iirfilter.h
+ * @file
  * IIR filter interface
  */
 
@@ -34,6 +34,7 @@ struct FFIIRFilterState;
 
 enum IIRFilterType{
     FF_FILTER_TYPE_BESSEL,
+    FF_FILTER_TYPE_BIQUAD,
     FF_FILTER_TYPE_BUTTERWORTH,
     FF_FILTER_TYPE_CHEBYSHEV,
     FF_FILTER_TYPE_ELLIPTIC,
@@ -49,6 +50,8 @@ enum IIRFilterMode{
 /**
  * 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
@@ -58,10 +61,11 @@ enum IIRFilterMode{
  *
  * @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.
@@ -87,7 +91,7 @@ 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 +104,19 @@ 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, float *dst, int dstep);
+
 #endif /* AVCODEC_IIRFILTER_H */