diff options
Diffstat (limited to 'ffmpeg/libavcodec/iirfilter.h')
| -rw-r--r-- | ffmpeg/libavcodec/iirfilter.h | 145 |
1 files changed, 0 insertions, 145 deletions
diff --git a/ffmpeg/libavcodec/iirfilter.h b/ffmpeg/libavcodec/iirfilter.h deleted file mode 100644 index 4ea6642..0000000 --- a/ffmpeg/libavcodec/iirfilter.h +++ /dev/null @@ -1,145 +0,0 @@ -/* - * IIR filter - * Copyright (c) 2008 Konstantin Shishkov - * - * This file is part of FFmpeg. - * - * FFmpeg 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, - * 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 - * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA - */ - -/** - * @file - * IIR filter interface - */ - -#ifndef AVCODEC_IIRFILTER_H -#define AVCODEC_IIRFILTER_H - -#include "avcodec.h" - -struct FFIIRFilterCoeffs; -struct FFIIRFilterState; - -enum IIRFilterType{ - FF_FILTER_TYPE_BESSEL, - FF_FILTER_TYPE_BIQUAD, - FF_FILTER_TYPE_BUTTERWORTH, - FF_FILTER_TYPE_CHEBYSHEV, - FF_FILTER_TYPE_ELLIPTIC, -}; - -enum IIRFilterMode{ - FF_FILTER_MODE_LOWPASS, - FF_FILTER_MODE_HIGHPASS, - FF_FILTER_MODE_BANDPASS, - FF_FILTER_MODE_BANDSTOP, -}; - -typedef struct FFIIRFilterContext { - /** - * 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 (*filter_flt)(const struct FFIIRFilterCoeffs *coeffs, - struct FFIIRFilterState *state, int size, - const float *src, int sstep, float *dst, int dstep); -} FFIIRFilterContext; - -/** - * Initialize FFIIRFilterContext - */ -void ff_iir_filter_init(FFIIRFilterContext *f); -void ff_iir_filter_init_mips(FFIIRFilterContext *f); - -/** - * 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 - * @param cutoff_ratio cutoff to input frequency ratio - * @param stopband stopband to input frequency ratio (used by bandpass and bandstop filter modes) - * @param ripple ripple factor (used only in Chebyshev filters) - * - * @return pointer to filter coefficients structure or NULL if filter cannot be created - */ -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. - * - * @param order filter order - * - * @return pointer to new filter state or NULL if state creation fails - */ -struct FFIIRFilterState* ff_iir_filter_init_state(int order); - -/** - * Free filter coefficients. - * - * @param coeffs pointer allocated with ff_iir_filter_init_coeffs() - */ -void ff_iir_filter_free_coeffs(struct FFIIRFilterCoeffs *coeffs); - -/** - * Free filter state. - * - * @param state pointer allocated with ff_iir_filter_init_state() - */ -void ff_iir_filter_free_state(struct FFIIRFilterState *state); - -/** - * Perform IIR filtering on signed 16-bit 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(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 */ |