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624 lines
26 KiB
C
624 lines
26 KiB
C
/*
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* Copyright (c) 2013 Paul B Mahol
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* Copyright (c) 2006-2008 Rob Sykes <robs@users.sourceforge.net>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* 2-pole filters designed by Robert Bristow-Johnson <rbj@audioimagination.com>
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* see http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt
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*
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* 1-pole filters based on code (c) 2000 Chris Bagwell <cbagwell@sprynet.com>
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* Algorithms: Recursive single pole low/high pass filter
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* Reference: The Scientist and Engineer's Guide to Digital Signal Processing
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*
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* low-pass: output[N] = input[N] * A + output[N-1] * B
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* X = exp(-2.0 * pi * Fc)
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* A = 1 - X
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* B = X
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* Fc = cutoff freq / sample rate
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*
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* Mimics an RC low-pass filter:
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*
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* ---/\/\/\/\----------->
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* |
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* --- C
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* ---
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* |
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* |
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* V
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*
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* high-pass: output[N] = A0 * input[N] + A1 * input[N-1] + B1 * output[N-1]
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* X = exp(-2.0 * pi * Fc)
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* A0 = (1 + X) / 2
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* A1 = -(1 + X) / 2
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* B1 = X
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* Fc = cutoff freq / sample rate
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*
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* Mimics an RC high-pass filter:
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*
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* || C
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* ----||--------->
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* || |
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* <
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* > R
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* <
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* |
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* V
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*/
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#include "libavutil/avassert.h"
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#include "libavutil/opt.h"
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#include "audio.h"
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#include "avfilter.h"
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#include "internal.h"
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enum FilterType {
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biquad,
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equalizer,
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bass,
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treble,
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band,
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bandpass,
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bandreject,
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allpass,
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highpass,
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lowpass,
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};
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enum WidthType {
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NONE,
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HERTZ,
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OCTAVE,
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QFACTOR,
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SLOPE,
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};
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typedef struct ChanCache {
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double i1, i2;
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double o1, o2;
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} ChanCache;
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typedef struct {
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const AVClass *class;
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enum FilterType filter_type;
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int width_type;
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int poles;
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int csg;
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double gain;
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double frequency;
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double width;
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double a0, a1, a2;
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double b0, b1, b2;
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ChanCache *cache;
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void (*filter)(const void *ibuf, void *obuf, int len,
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double *i1, double *i2, double *o1, double *o2,
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double b0, double b1, double b2, double a1, double a2);
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} BiquadsContext;
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static av_cold int init(AVFilterContext *ctx)
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{
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BiquadsContext *s = ctx->priv;
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if (s->filter_type != biquad) {
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if (s->frequency <= 0 || s->width <= 0) {
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av_log(ctx, AV_LOG_ERROR, "Invalid frequency %f and/or width %f <= 0\n",
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s->frequency, s->width);
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return AVERROR(EINVAL);
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}
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}
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return 0;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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AVFilterFormats *formats;
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AVFilterChannelLayouts *layouts;
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static const enum AVSampleFormat sample_fmts[] = {
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AV_SAMPLE_FMT_S16P,
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AV_SAMPLE_FMT_S32P,
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AV_SAMPLE_FMT_FLTP,
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AV_SAMPLE_FMT_DBLP,
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AV_SAMPLE_FMT_NONE
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};
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int ret;
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layouts = ff_all_channel_counts();
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if (!layouts)
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return AVERROR(ENOMEM);
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ret = ff_set_common_channel_layouts(ctx, layouts);
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if (ret < 0)
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return ret;
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formats = ff_make_format_list(sample_fmts);
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if (!formats)
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return AVERROR(ENOMEM);
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ret = ff_set_common_formats(ctx, formats);
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if (ret < 0)
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return ret;
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formats = ff_all_samplerates();
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if (!formats)
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return AVERROR(ENOMEM);
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return ff_set_common_samplerates(ctx, formats);
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}
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#define BIQUAD_FILTER(name, type, min, max, need_clipping) \
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static void biquad_## name (const void *input, void *output, int len, \
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double *in1, double *in2, \
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double *out1, double *out2, \
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double b0, double b1, double b2, \
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double a1, double a2) \
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{ \
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const type *ibuf = input; \
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type *obuf = output; \
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double i1 = *in1; \
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double i2 = *in2; \
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double o1 = *out1; \
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double o2 = *out2; \
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int i; \
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a1 = -a1; \
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a2 = -a2; \
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\
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for (i = 0; i+1 < len; i++) { \
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o2 = i2 * b2 + i1 * b1 + ibuf[i] * b0 + o2 * a2 + o1 * a1; \
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i2 = ibuf[i]; \
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if (need_clipping && o2 < min) { \
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av_log(NULL, AV_LOG_WARNING, "clipping\n"); \
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obuf[i] = min; \
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} else if (need_clipping && o2 > max) { \
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av_log(NULL, AV_LOG_WARNING, "clipping\n"); \
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obuf[i] = max; \
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} else { \
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obuf[i] = o2; \
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} \
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i++; \
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o1 = i1 * b2 + i2 * b1 + ibuf[i] * b0 + o1 * a2 + o2 * a1; \
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i1 = ibuf[i]; \
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if (need_clipping && o1 < min) { \
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av_log(NULL, AV_LOG_WARNING, "clipping\n"); \
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obuf[i] = min; \
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} else if (need_clipping && o1 > max) { \
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av_log(NULL, AV_LOG_WARNING, "clipping\n"); \
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obuf[i] = max; \
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} else { \
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obuf[i] = o1; \
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} \
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} \
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if (i < len) { \
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double o0 = ibuf[i] * b0 + i1 * b1 + i2 * b2 + o1 * a1 + o2 * a2; \
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i2 = i1; \
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i1 = ibuf[i]; \
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o2 = o1; \
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o1 = o0; \
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if (need_clipping && o0 < min) { \
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av_log(NULL, AV_LOG_WARNING, "clipping\n"); \
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obuf[i] = min; \
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} else if (need_clipping && o0 > max) { \
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av_log(NULL, AV_LOG_WARNING, "clipping\n"); \
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obuf[i] = max; \
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} else { \
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obuf[i] = o0; \
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} \
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} \
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*in1 = i1; \
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*in2 = i2; \
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*out1 = o1; \
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*out2 = o2; \
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}
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BIQUAD_FILTER(s16, int16_t, INT16_MIN, INT16_MAX, 1)
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BIQUAD_FILTER(s32, int32_t, INT32_MIN, INT32_MAX, 1)
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BIQUAD_FILTER(flt, float, -1., 1., 0)
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BIQUAD_FILTER(dbl, double, -1., 1., 0)
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static int config_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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BiquadsContext *s = ctx->priv;
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AVFilterLink *inlink = ctx->inputs[0];
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double A = exp(s->gain / 40 * log(10.));
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double w0 = 2 * M_PI * s->frequency / inlink->sample_rate;
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double alpha;
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if (w0 > M_PI) {
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av_log(ctx, AV_LOG_ERROR,
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"Invalid frequency %f. Frequency must be less than half the sample-rate %d.\n",
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s->frequency, inlink->sample_rate);
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return AVERROR(EINVAL);
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}
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switch (s->width_type) {
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case NONE:
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alpha = 0.0;
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break;
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case HERTZ:
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alpha = sin(w0) / (2 * s->frequency / s->width);
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break;
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case OCTAVE:
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alpha = sin(w0) * sinh(log(2.) / 2 * s->width * w0 / sin(w0));
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break;
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case QFACTOR:
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alpha = sin(w0) / (2 * s->width);
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break;
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case SLOPE:
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alpha = sin(w0) / 2 * sqrt((A + 1 / A) * (1 / s->width - 1) + 2);
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break;
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default:
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av_assert0(0);
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}
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switch (s->filter_type) {
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case biquad:
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break;
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case equalizer:
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s->a0 = 1 + alpha / A;
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s->a1 = -2 * cos(w0);
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s->a2 = 1 - alpha / A;
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s->b0 = 1 + alpha * A;
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s->b1 = -2 * cos(w0);
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s->b2 = 1 - alpha * A;
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break;
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case bass:
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s->a0 = (A + 1) + (A - 1) * cos(w0) + 2 * sqrt(A) * alpha;
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s->a1 = -2 * ((A - 1) + (A + 1) * cos(w0));
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s->a2 = (A + 1) + (A - 1) * cos(w0) - 2 * sqrt(A) * alpha;
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s->b0 = A * ((A + 1) - (A - 1) * cos(w0) + 2 * sqrt(A) * alpha);
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s->b1 = 2 * A * ((A - 1) - (A + 1) * cos(w0));
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s->b2 = A * ((A + 1) - (A - 1) * cos(w0) - 2 * sqrt(A) * alpha);
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break;
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case treble:
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s->a0 = (A + 1) - (A - 1) * cos(w0) + 2 * sqrt(A) * alpha;
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s->a1 = 2 * ((A - 1) - (A + 1) * cos(w0));
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s->a2 = (A + 1) - (A - 1) * cos(w0) - 2 * sqrt(A) * alpha;
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s->b0 = A * ((A + 1) + (A - 1) * cos(w0) + 2 * sqrt(A) * alpha);
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s->b1 =-2 * A * ((A - 1) + (A + 1) * cos(w0));
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s->b2 = A * ((A + 1) + (A - 1) * cos(w0) - 2 * sqrt(A) * alpha);
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break;
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case bandpass:
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if (s->csg) {
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s->a0 = 1 + alpha;
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s->a1 = -2 * cos(w0);
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s->a2 = 1 - alpha;
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s->b0 = sin(w0) / 2;
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s->b1 = 0;
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s->b2 = -sin(w0) / 2;
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} else {
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s->a0 = 1 + alpha;
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s->a1 = -2 * cos(w0);
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s->a2 = 1 - alpha;
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s->b0 = alpha;
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s->b1 = 0;
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s->b2 = -alpha;
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}
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break;
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case bandreject:
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s->a0 = 1 + alpha;
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s->a1 = -2 * cos(w0);
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s->a2 = 1 - alpha;
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s->b0 = 1;
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s->b1 = -2 * cos(w0);
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s->b2 = 1;
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break;
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case lowpass:
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if (s->poles == 1) {
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s->a0 = 1;
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s->a1 = -exp(-w0);
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s->a2 = 0;
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s->b0 = 1 + s->a1;
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s->b1 = 0;
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s->b2 = 0;
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} else {
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s->a0 = 1 + alpha;
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s->a1 = -2 * cos(w0);
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s->a2 = 1 - alpha;
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s->b0 = (1 - cos(w0)) / 2;
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s->b1 = 1 - cos(w0);
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s->b2 = (1 - cos(w0)) / 2;
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}
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break;
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case highpass:
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if (s->poles == 1) {
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s->a0 = 1;
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s->a1 = -exp(-w0);
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s->a2 = 0;
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s->b0 = (1 - s->a1) / 2;
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s->b1 = -s->b0;
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s->b2 = 0;
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} else {
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s->a0 = 1 + alpha;
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s->a1 = -2 * cos(w0);
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s->a2 = 1 - alpha;
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s->b0 = (1 + cos(w0)) / 2;
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s->b1 = -(1 + cos(w0));
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s->b2 = (1 + cos(w0)) / 2;
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}
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break;
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case allpass:
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s->a0 = 1 + alpha;
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s->a1 = -2 * cos(w0);
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s->a2 = 1 - alpha;
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s->b0 = 1 - alpha;
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s->b1 = -2 * cos(w0);
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s->b2 = 1 + alpha;
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break;
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default:
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av_assert0(0);
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}
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s->a1 /= s->a0;
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s->a2 /= s->a0;
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s->b0 /= s->a0;
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s->b1 /= s->a0;
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s->b2 /= s->a0;
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s->cache = av_realloc_f(s->cache, sizeof(ChanCache), inlink->channels);
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if (!s->cache)
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return AVERROR(ENOMEM);
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memset(s->cache, 0, sizeof(ChanCache) * inlink->channels);
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switch (inlink->format) {
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case AV_SAMPLE_FMT_S16P: s->filter = biquad_s16; break;
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case AV_SAMPLE_FMT_S32P: s->filter = biquad_s32; break;
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case AV_SAMPLE_FMT_FLTP: s->filter = biquad_flt; break;
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case AV_SAMPLE_FMT_DBLP: s->filter = biquad_dbl; break;
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default: av_assert0(0);
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}
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return 0;
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}
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static int filter_frame(AVFilterLink *inlink, AVFrame *buf)
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{
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BiquadsContext *s = inlink->dst->priv;
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AVFilterLink *outlink = inlink->dst->outputs[0];
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AVFrame *out_buf;
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int nb_samples = buf->nb_samples;
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int ch;
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if (av_frame_is_writable(buf)) {
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out_buf = buf;
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} else {
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out_buf = ff_get_audio_buffer(inlink, nb_samples);
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if (!out_buf)
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return AVERROR(ENOMEM);
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av_frame_copy_props(out_buf, buf);
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}
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for (ch = 0; ch < av_frame_get_channels(buf); ch++)
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s->filter(buf->extended_data[ch],
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out_buf->extended_data[ch], nb_samples,
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&s->cache[ch].i1, &s->cache[ch].i2,
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&s->cache[ch].o1, &s->cache[ch].o2,
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s->b0, s->b1, s->b2, s->a1, s->a2);
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if (buf != out_buf)
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av_frame_free(&buf);
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return ff_filter_frame(outlink, out_buf);
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}
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static av_cold void uninit(AVFilterContext *ctx)
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{
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BiquadsContext *s = ctx->priv;
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av_freep(&s->cache);
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}
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static const AVFilterPad inputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.filter_frame = filter_frame,
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},
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{ NULL }
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};
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static const AVFilterPad outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.config_props = config_output,
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},
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{ NULL }
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};
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#define OFFSET(x) offsetof(BiquadsContext, x)
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#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
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#define DEFINE_BIQUAD_FILTER(name_, description_) \
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AVFILTER_DEFINE_CLASS(name_); \
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static av_cold int name_##_init(AVFilterContext *ctx) \
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{ \
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BiquadsContext *s = ctx->priv; \
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s->class = &name_##_class; \
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s->filter_type = name_; \
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return init(ctx); \
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} \
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\
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AVFilter ff_af_##name_ = { \
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.name = #name_, \
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.description = NULL_IF_CONFIG_SMALL(description_), \
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.priv_size = sizeof(BiquadsContext), \
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.init = name_##_init, \
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.uninit = uninit, \
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.query_formats = query_formats, \
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.inputs = inputs, \
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.outputs = outputs, \
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.priv_class = &name_##_class, \
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}
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#if CONFIG_EQUALIZER_FILTER
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static const AVOption equalizer_options[] = {
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{"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 999999, FLAGS},
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{"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 999999, FLAGS},
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{"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"},
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{"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
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{"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
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{"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
|
|
{"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
|
|
{"width", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 999, FLAGS},
|
|
{"w", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 999, FLAGS},
|
|
{"gain", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
|
|
{"g", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
|
|
{NULL}
|
|
};
|
|
|
|
DEFINE_BIQUAD_FILTER(equalizer, "Apply two-pole peaking equalization (EQ) filter.");
|
|
#endif /* CONFIG_EQUALIZER_FILTER */
|
|
#if CONFIG_BASS_FILTER
|
|
static const AVOption bass_options[] = {
|
|
{"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=100}, 0, 999999, FLAGS},
|
|
{"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=100}, 0, 999999, FLAGS},
|
|
{"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"},
|
|
{"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
|
|
{"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
|
|
{"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
|
|
{"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
|
|
{"width", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
|
|
{"w", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
|
|
{"gain", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
|
|
{"g", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
|
|
{NULL}
|
|
};
|
|
|
|
DEFINE_BIQUAD_FILTER(bass, "Boost or cut lower frequencies.");
|
|
#endif /* CONFIG_BASS_FILTER */
|
|
#if CONFIG_TREBLE_FILTER
|
|
static const AVOption treble_options[] = {
|
|
{"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
|
|
{"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
|
|
{"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"},
|
|
{"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
|
|
{"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
|
|
{"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
|
|
{"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
|
|
{"width", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
|
|
{"w", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS},
|
|
{"gain", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
|
|
{"g", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS},
|
|
{NULL}
|
|
};
|
|
|
|
DEFINE_BIQUAD_FILTER(treble, "Boost or cut upper frequencies.");
|
|
#endif /* CONFIG_TREBLE_FILTER */
|
|
#if CONFIG_BANDPASS_FILTER
|
|
static const AVOption bandpass_options[] = {
|
|
{"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
|
|
{"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
|
|
{"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"},
|
|
{"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
|
|
{"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
|
|
{"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
|
|
{"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
|
|
{"width", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 999, FLAGS},
|
|
{"w", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 999, FLAGS},
|
|
{"csg", "use constant skirt gain", OFFSET(csg), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, FLAGS},
|
|
{NULL}
|
|
};
|
|
|
|
DEFINE_BIQUAD_FILTER(bandpass, "Apply a two-pole Butterworth band-pass filter.");
|
|
#endif /* CONFIG_BANDPASS_FILTER */
|
|
#if CONFIG_BANDREJECT_FILTER
|
|
static const AVOption bandreject_options[] = {
|
|
{"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
|
|
{"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
|
|
{"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"},
|
|
{"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
|
|
{"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
|
|
{"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
|
|
{"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
|
|
{"width", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 999, FLAGS},
|
|
{"w", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 999, FLAGS},
|
|
{NULL}
|
|
};
|
|
|
|
DEFINE_BIQUAD_FILTER(bandreject, "Apply a two-pole Butterworth band-reject filter.");
|
|
#endif /* CONFIG_BANDREJECT_FILTER */
|
|
#if CONFIG_LOWPASS_FILTER
|
|
static const AVOption lowpass_options[] = {
|
|
{"frequency", "set frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=500}, 0, 999999, FLAGS},
|
|
{"f", "set frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=500}, 0, 999999, FLAGS},
|
|
{"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"},
|
|
{"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
|
|
{"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
|
|
{"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
|
|
{"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
|
|
{"width", "set width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.707}, 0, 99999, FLAGS},
|
|
{"w", "set width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.707}, 0, 99999, FLAGS},
|
|
{"poles", "set number of poles", OFFSET(poles), AV_OPT_TYPE_INT, {.i64=2}, 1, 2, FLAGS},
|
|
{"p", "set number of poles", OFFSET(poles), AV_OPT_TYPE_INT, {.i64=2}, 1, 2, FLAGS},
|
|
{NULL}
|
|
};
|
|
|
|
DEFINE_BIQUAD_FILTER(lowpass, "Apply a low-pass filter with 3dB point frequency.");
|
|
#endif /* CONFIG_LOWPASS_FILTER */
|
|
#if CONFIG_HIGHPASS_FILTER
|
|
static const AVOption highpass_options[] = {
|
|
{"frequency", "set frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
|
|
{"f", "set frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
|
|
{"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"},
|
|
{"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
|
|
{"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
|
|
{"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
|
|
{"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
|
|
{"width", "set width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.707}, 0, 99999, FLAGS},
|
|
{"w", "set width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.707}, 0, 99999, FLAGS},
|
|
{"poles", "set number of poles", OFFSET(poles), AV_OPT_TYPE_INT, {.i64=2}, 1, 2, FLAGS},
|
|
{"p", "set number of poles", OFFSET(poles), AV_OPT_TYPE_INT, {.i64=2}, 1, 2, FLAGS},
|
|
{NULL}
|
|
};
|
|
|
|
DEFINE_BIQUAD_FILTER(highpass, "Apply a high-pass filter with 3dB point frequency.");
|
|
#endif /* CONFIG_HIGHPASS_FILTER */
|
|
#if CONFIG_ALLPASS_FILTER
|
|
static const AVOption allpass_options[] = {
|
|
{"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
|
|
{"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS},
|
|
{"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=HERTZ}, HERTZ, SLOPE, FLAGS, "width_type"},
|
|
{"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"},
|
|
{"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"},
|
|
{"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"},
|
|
{"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"},
|
|
{"width", "set filter-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=707.1}, 0, 99999, FLAGS},
|
|
{"w", "set filter-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=707.1}, 0, 99999, FLAGS},
|
|
{NULL}
|
|
};
|
|
|
|
DEFINE_BIQUAD_FILTER(allpass, "Apply a two-pole all-pass filter.");
|
|
#endif /* CONFIG_ALLPASS_FILTER */
|
|
#if CONFIG_BIQUAD_FILTER
|
|
static const AVOption biquad_options[] = {
|
|
{"a0", NULL, OFFSET(a0), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS},
|
|
{"a1", NULL, OFFSET(a1), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS},
|
|
{"a2", NULL, OFFSET(a2), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS},
|
|
{"b0", NULL, OFFSET(b0), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS},
|
|
{"b1", NULL, OFFSET(b1), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS},
|
|
{"b2", NULL, OFFSET(b2), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS},
|
|
{NULL}
|
|
};
|
|
|
|
DEFINE_BIQUAD_FILTER(biquad, "Apply a biquad IIR filter with the given coefficients.");
|
|
#endif /* CONFIG_BIQUAD_FILTER */
|