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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * Copyright (c) 2013 Paul B Mahol |
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| 3 | * Copyright (c) 2006-2008 Rob Sykes |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | /* |
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| 23 | * 2-pole filters designed by Robert Bristow-Johnson |
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| 24 | * see http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt |
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| 25 | * |
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| 26 | * 1-pole filters based on code (c) 2000 Chris Bagwell |
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| 27 | * Algorithms: Recursive single pole low/high pass filter |
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| 28 | * Reference: The Scientist and Engineer's Guide to Digital Signal Processing |
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| 29 | * |
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| 30 | * low-pass: output[N] = input[N] * A + output[N-1] * B |
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| 31 | * X = exp(-2.0 * pi * Fc) |
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| 32 | * A = 1 - X |
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| 33 | * B = X |
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| 34 | * Fc = cutoff freq / sample rate |
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| 35 | * |
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| 36 | * Mimics an RC low-pass filter: |
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| 37 | * |
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| 38 | * ---/\/\/\/\-----------> |
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| 39 | * | |
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| 40 | * --- C |
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| 41 | * --- |
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| 42 | * | |
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| 43 | * | |
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| 44 | * V |
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| 45 | * |
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| 46 | * high-pass: output[N] = A0 * input[N] + A1 * input[N-1] + B1 * output[N-1] |
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| 47 | * X = exp(-2.0 * pi * Fc) |
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| 48 | * A0 = (1 + X) / 2 |
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| 49 | * A1 = -(1 + X) / 2 |
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| 50 | * B1 = X |
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| 51 | * Fc = cutoff freq / sample rate |
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| 52 | * |
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| 53 | * Mimics an RC high-pass filter: |
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| 54 | * |
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| 55 | * || C |
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| 56 | * ----||---------> |
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| 57 | * || | |
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| 58 | * < |
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| 59 | * > R |
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| 60 | * < |
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| 61 | * | |
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| 62 | * V |
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| 63 | */ |
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| 64 | |||
| 65 | #include "libavutil/avassert.h" |
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| 66 | #include "libavutil/opt.h" |
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| 67 | #include "audio.h" |
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| 68 | #include "avfilter.h" |
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| 69 | #include "internal.h" |
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| 70 | |||
| 71 | enum FilterType { |
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| 72 | biquad, |
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| 73 | equalizer, |
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| 74 | bass, |
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| 75 | treble, |
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| 76 | band, |
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| 77 | bandpass, |
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| 78 | bandreject, |
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| 79 | allpass, |
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| 80 | highpass, |
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| 81 | lowpass, |
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| 82 | }; |
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| 83 | |||
| 84 | enum WidthType { |
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| 85 | NONE, |
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| 86 | HERTZ, |
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| 87 | OCTAVE, |
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| 88 | QFACTOR, |
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| 89 | SLOPE, |
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| 90 | }; |
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| 91 | |||
| 92 | typedef struct ChanCache { |
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| 93 | double i1, i2; |
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| 94 | double o1, o2; |
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| 95 | } ChanCache; |
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| 96 | |||
| 97 | typedef struct { |
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| 98 | const AVClass *class; |
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| 99 | |||
| 100 | enum FilterType filter_type; |
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| 101 | enum WidthType width_type; |
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| 102 | int poles; |
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| 103 | int csg; |
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| 104 | |||
| 105 | double gain; |
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| 106 | double frequency; |
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| 107 | double width; |
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| 108 | |||
| 109 | double a0, a1, a2; |
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| 110 | double b0, b1, b2; |
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| 111 | |||
| 112 | ChanCache *cache; |
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| 113 | |||
| 114 | void (*filter)(const void *ibuf, void *obuf, int len, |
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| 115 | double *i1, double *i2, double *o1, double *o2, |
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| 116 | double b0, double b1, double b2, double a1, double a2); |
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| 117 | } BiquadsContext; |
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| 118 | |||
| 119 | static av_cold int init(AVFilterContext *ctx) |
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| 120 | { |
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| 121 | BiquadsContext *p = ctx->priv; |
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| 122 | |||
| 123 | if (p->filter_type != biquad) { |
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| 124 | if (p->frequency <= 0 || p->width <= 0) { |
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| 125 | av_log(ctx, AV_LOG_ERROR, "Invalid frequency %f and/or width %f <= 0\n", |
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| 126 | p->frequency, p->width); |
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| 127 | return AVERROR(EINVAL); |
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| 128 | } |
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| 129 | } |
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| 130 | |||
| 131 | return 0; |
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| 132 | } |
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| 133 | |||
| 134 | static int query_formats(AVFilterContext *ctx) |
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| 135 | { |
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| 136 | AVFilterFormats *formats; |
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| 137 | AVFilterChannelLayouts *layouts; |
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| 138 | static const enum AVSampleFormat sample_fmts[] = { |
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| 139 | AV_SAMPLE_FMT_S16P, |
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| 140 | AV_SAMPLE_FMT_S32P, |
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| 141 | AV_SAMPLE_FMT_FLTP, |
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| 142 | AV_SAMPLE_FMT_DBLP, |
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| 143 | AV_SAMPLE_FMT_NONE |
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| 144 | }; |
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| 145 | |||
| 146 | layouts = ff_all_channel_layouts(); |
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| 147 | if (!layouts) |
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| 148 | return AVERROR(ENOMEM); |
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| 149 | ff_set_common_channel_layouts(ctx, layouts); |
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| 150 | |||
| 151 | formats = ff_make_format_list(sample_fmts); |
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| 152 | if (!formats) |
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| 153 | return AVERROR(ENOMEM); |
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| 154 | ff_set_common_formats(ctx, formats); |
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| 155 | |||
| 156 | formats = ff_all_samplerates(); |
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| 157 | if (!formats) |
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| 158 | return AVERROR(ENOMEM); |
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| 159 | ff_set_common_samplerates(ctx, formats); |
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| 160 | |||
| 161 | return 0; |
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| 162 | } |
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| 163 | |||
| 164 | #define BIQUAD_FILTER(name, type, min, max) \ |
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| 165 | static void biquad_## name (const void *input, void *output, int len, \ |
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| 166 | double *in1, double *in2, \ |
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| 167 | double *out1, double *out2, \ |
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| 168 | double b0, double b1, double b2, \ |
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| 169 | double a1, double a2) \ |
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| 170 | { \ |
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| 171 | const type *ibuf = input; \ |
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| 172 | type *obuf = output; \ |
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| 173 | double i1 = *in1; \ |
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| 174 | double i2 = *in2; \ |
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| 175 | double o1 = *out1; \ |
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| 176 | double o2 = *out2; \ |
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| 177 | int i; \ |
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| 178 | a1 = -a1; \ |
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| 179 | a2 = -a2; \ |
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| 180 | \ |
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| 181 | for (i = 0; i+1 < len; i++) { \ |
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| 182 | o2 = i2 * b2 + i1 * b1 + ibuf[i] * b0 + o2 * a2 + o1 * a1; \ |
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| 183 | i2 = ibuf[i]; \ |
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| 184 | if (o2 < min) { \ |
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| 185 | av_log(NULL, AV_LOG_WARNING, "clipping\n"); \ |
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| 186 | obuf[i] = min; \ |
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| 187 | } else if (o2 > max) { \ |
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| 188 | av_log(NULL, AV_LOG_WARNING, "clipping\n"); \ |
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| 189 | obuf[i] = max; \ |
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| 190 | } else { \ |
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| 191 | obuf[i] = o2; \ |
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| 192 | } \ |
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| 193 | i++; \ |
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| 194 | o1 = i1 * b2 + i2 * b1 + ibuf[i] * b0 + o1 * a2 + o2 * a1; \ |
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| 195 | i1 = ibuf[i]; \ |
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| 196 | if (o1 < min) { \ |
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| 197 | av_log(NULL, AV_LOG_WARNING, "clipping\n"); \ |
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| 198 | obuf[i] = min; \ |
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| 199 | } else if (o1 > max) { \ |
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| 200 | av_log(NULL, AV_LOG_WARNING, "clipping\n"); \ |
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| 201 | obuf[i] = max; \ |
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| 202 | } else { \ |
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| 203 | obuf[i] = o1; \ |
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| 204 | } \ |
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| 205 | } \ |
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| 206 | if (i < len) { \ |
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| 207 | double o0 = ibuf[i] * b0 + i1 * b1 + i2 * b2 + o1 * a1 + o2 * a2; \ |
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| 208 | i2 = i1; \ |
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| 209 | i1 = ibuf[i]; \ |
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| 210 | o2 = o1; \ |
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| 211 | o1 = o0; \ |
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| 212 | if (o0 < min) { \ |
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| 213 | av_log(NULL, AV_LOG_WARNING, "clipping\n"); \ |
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| 214 | obuf[i] = min; \ |
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| 215 | } else if (o0 > max) { \ |
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| 216 | av_log(NULL, AV_LOG_WARNING, "clipping\n"); \ |
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| 217 | obuf[i] = max; \ |
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| 218 | } else { \ |
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| 219 | obuf[i] = o0; \ |
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| 220 | } \ |
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| 221 | } \ |
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| 222 | *in1 = i1; \ |
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| 223 | *in2 = i2; \ |
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| 224 | *out1 = o1; \ |
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| 225 | *out2 = o2; \ |
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| 226 | } |
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| 227 | |||
| 228 | BIQUAD_FILTER(s16, int16_t, INT16_MIN, INT16_MAX) |
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| 229 | BIQUAD_FILTER(s32, int32_t, INT32_MIN, INT32_MAX) |
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| 230 | BIQUAD_FILTER(flt, float, -1., 1.) |
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| 231 | BIQUAD_FILTER(dbl, double, -1., 1.) |
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| 232 | |||
| 233 | static int config_output(AVFilterLink *outlink) |
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| 234 | { |
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| 235 | AVFilterContext *ctx = outlink->src; |
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| 236 | BiquadsContext *p = ctx->priv; |
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| 237 | AVFilterLink *inlink = ctx->inputs[0]; |
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| 238 | double A = exp(p->gain / 40 * log(10.)); |
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| 239 | double w0 = 2 * M_PI * p->frequency / inlink->sample_rate; |
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| 240 | double alpha; |
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| 241 | |||
| 242 | if (w0 > M_PI) { |
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| 243 | av_log(ctx, AV_LOG_ERROR, |
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| 244 | "Invalid frequency %f. Frequency must be less than half the sample-rate %d.\n", |
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| 245 | p->frequency, inlink->sample_rate); |
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| 246 | return AVERROR(EINVAL); |
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| 247 | } |
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| 248 | |||
| 249 | switch (p->width_type) { |
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| 250 | case NONE: |
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| 251 | alpha = 0.0; |
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| 252 | break; |
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| 253 | case HERTZ: |
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| 254 | alpha = sin(w0) / (2 * p->frequency / p->width); |
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| 255 | break; |
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| 256 | case OCTAVE: |
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| 257 | alpha = sin(w0) * sinh(log(2.) / 2 * p->width * w0 / sin(w0)); |
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| 258 | break; |
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| 259 | case QFACTOR: |
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| 260 | alpha = sin(w0) / (2 * p->width); |
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| 261 | break; |
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| 262 | case SLOPE: |
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| 263 | alpha = sin(w0) / 2 * sqrt((A + 1 / A) * (1 / p->width - 1) + 2); |
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| 264 | break; |
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| 265 | default: |
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| 266 | av_assert0(0); |
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| 267 | } |
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| 268 | |||
| 269 | switch (p->filter_type) { |
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| 270 | case biquad: |
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| 271 | break; |
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| 272 | case equalizer: |
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| 273 | p->a0 = 1 + alpha / A; |
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| 274 | p->a1 = -2 * cos(w0); |
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| 275 | p->a2 = 1 - alpha / A; |
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| 276 | p->b0 = 1 + alpha * A; |
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| 277 | p->b1 = -2 * cos(w0); |
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| 278 | p->b2 = 1 - alpha * A; |
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| 279 | break; |
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| 280 | case bass: |
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| 281 | p->a0 = (A + 1) + (A - 1) * cos(w0) + 2 * sqrt(A) * alpha; |
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| 282 | p->a1 = -2 * ((A - 1) + (A + 1) * cos(w0)); |
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| 283 | p->a2 = (A + 1) + (A - 1) * cos(w0) - 2 * sqrt(A) * alpha; |
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| 284 | p->b0 = A * ((A + 1) - (A - 1) * cos(w0) + 2 * sqrt(A) * alpha); |
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| 285 | p->b1 = 2 * A * ((A - 1) - (A + 1) * cos(w0)); |
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| 286 | p->b2 = A * ((A + 1) - (A - 1) * cos(w0) - 2 * sqrt(A) * alpha); |
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| 287 | break; |
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| 288 | case treble: |
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| 289 | p->a0 = (A + 1) - (A - 1) * cos(w0) + 2 * sqrt(A) * alpha; |
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| 290 | p->a1 = 2 * ((A - 1) - (A + 1) * cos(w0)); |
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| 291 | p->a2 = (A + 1) - (A - 1) * cos(w0) - 2 * sqrt(A) * alpha; |
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| 292 | p->b0 = A * ((A + 1) + (A - 1) * cos(w0) + 2 * sqrt(A) * alpha); |
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| 293 | p->b1 =-2 * A * ((A - 1) + (A + 1) * cos(w0)); |
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| 294 | p->b2 = A * ((A + 1) + (A - 1) * cos(w0) - 2 * sqrt(A) * alpha); |
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| 295 | break; |
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| 296 | case bandpass: |
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| 297 | if (p->csg) { |
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| 298 | p->a0 = 1 + alpha; |
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| 299 | p->a1 = -2 * cos(w0); |
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| 300 | p->a2 = 1 - alpha; |
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| 301 | p->b0 = sin(w0) / 2; |
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| 302 | p->b1 = 0; |
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| 303 | p->b2 = -sin(w0) / 2; |
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| 304 | } else { |
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| 305 | p->a0 = 1 + alpha; |
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| 306 | p->a1 = -2 * cos(w0); |
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| 307 | p->a2 = 1 - alpha; |
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| 308 | p->b0 = alpha; |
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| 309 | p->b1 = 0; |
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| 310 | p->b2 = -alpha; |
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| 311 | } |
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| 312 | break; |
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| 313 | case bandreject: |
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| 314 | p->a0 = 1 + alpha; |
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| 315 | p->a1 = -2 * cos(w0); |
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| 316 | p->a2 = 1 - alpha; |
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| 317 | p->b0 = 1; |
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| 318 | p->b1 = -2 * cos(w0); |
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| 319 | p->b2 = 1; |
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| 320 | break; |
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| 321 | case lowpass: |
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| 322 | if (p->poles == 1) { |
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| 323 | p->a0 = 1; |
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| 324 | p->a1 = -exp(-w0); |
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| 325 | p->a2 = 0; |
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| 326 | p->b0 = 1 + p->a1; |
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| 327 | p->b1 = 0; |
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| 328 | p->b2 = 0; |
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| 329 | } else { |
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| 330 | p->a0 = 1 + alpha; |
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| 331 | p->a1 = -2 * cos(w0); |
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| 332 | p->a2 = 1 - alpha; |
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| 333 | p->b0 = (1 - cos(w0)) / 2; |
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| 334 | p->b1 = 1 - cos(w0); |
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| 335 | p->b2 = (1 - cos(w0)) / 2; |
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| 336 | } |
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| 337 | break; |
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| 338 | case highpass: |
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| 339 | if (p->poles == 1) { |
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| 340 | p->a0 = 1; |
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| 341 | p->a1 = -exp(-w0); |
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| 342 | p->a2 = 0; |
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| 343 | p->b0 = (1 - p->a1) / 2; |
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| 344 | p->b1 = -p->b0; |
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| 345 | p->b2 = 0; |
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| 346 | } else { |
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| 347 | p->a0 = 1 + alpha; |
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| 348 | p->a1 = -2 * cos(w0); |
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| 349 | p->a2 = 1 - alpha; |
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| 350 | p->b0 = (1 + cos(w0)) / 2; |
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| 351 | p->b1 = -(1 + cos(w0)); |
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| 352 | p->b2 = (1 + cos(w0)) / 2; |
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| 353 | } |
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| 354 | break; |
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| 355 | case allpass: |
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| 356 | p->a0 = 1 + alpha; |
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| 357 | p->a1 = -2 * cos(w0); |
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| 358 | p->a2 = 1 - alpha; |
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| 359 | p->b0 = 1 - alpha; |
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| 360 | p->b1 = -2 * cos(w0); |
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| 361 | p->b2 = 1 + alpha; |
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| 362 | break; |
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| 363 | default: |
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| 364 | av_assert0(0); |
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| 365 | } |
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| 366 | |||
| 367 | p->a1 /= p->a0; |
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| 368 | p->a2 /= p->a0; |
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| 369 | p->b0 /= p->a0; |
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| 370 | p->b1 /= p->a0; |
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| 371 | p->b2 /= p->a0; |
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| 372 | |||
| 373 | p->cache = av_realloc_f(p->cache, sizeof(ChanCache), inlink->channels); |
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| 374 | if (!p->cache) |
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| 375 | return AVERROR(ENOMEM); |
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| 376 | memset(p->cache, 0, sizeof(ChanCache) * inlink->channels); |
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| 377 | |||
| 378 | switch (inlink->format) { |
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| 379 | case AV_SAMPLE_FMT_S16P: p->filter = biquad_s16; break; |
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| 380 | case AV_SAMPLE_FMT_S32P: p->filter = biquad_s32; break; |
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| 381 | case AV_SAMPLE_FMT_FLTP: p->filter = biquad_flt; break; |
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| 382 | case AV_SAMPLE_FMT_DBLP: p->filter = biquad_dbl; break; |
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| 383 | default: av_assert0(0); |
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| 384 | } |
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| 385 | |||
| 386 | return 0; |
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| 387 | } |
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| 388 | |||
| 389 | static int filter_frame(AVFilterLink *inlink, AVFrame *buf) |
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| 390 | { |
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| 391 | BiquadsContext *p = inlink->dst->priv; |
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| 392 | AVFilterLink *outlink = inlink->dst->outputs[0]; |
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| 393 | AVFrame *out_buf; |
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| 394 | int nb_samples = buf->nb_samples; |
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| 395 | int ch; |
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| 396 | |||
| 397 | if (av_frame_is_writable(buf)) { |
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| 398 | out_buf = buf; |
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| 399 | } else { |
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| 400 | out_buf = ff_get_audio_buffer(inlink, nb_samples); |
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| 401 | if (!out_buf) |
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| 402 | return AVERROR(ENOMEM); |
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| 403 | av_frame_copy_props(out_buf, buf); |
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| 404 | } |
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| 405 | |||
| 406 | for (ch = 0; ch < av_frame_get_channels(buf); ch++) |
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| 407 | p->filter(buf->extended_data[ch], |
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| 408 | out_buf->extended_data[ch], nb_samples, |
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| 409 | &p->cache[ch].i1, &p->cache[ch].i2, |
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| 410 | &p->cache[ch].o1, &p->cache[ch].o2, |
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| 411 | p->b0, p->b1, p->b2, p->a1, p->a2); |
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| 412 | |||
| 413 | if (buf != out_buf) |
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| 414 | av_frame_free(&buf); |
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| 415 | |||
| 416 | return ff_filter_frame(outlink, out_buf); |
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| 417 | } |
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| 418 | |||
| 419 | static av_cold void uninit(AVFilterContext *ctx) |
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| 420 | { |
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| 421 | BiquadsContext *p = ctx->priv; |
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| 422 | |||
| 423 | av_freep(&p->cache); |
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| 424 | } |
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| 425 | |||
| 426 | static const AVFilterPad inputs[] = { |
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| 427 | { |
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| 428 | .name = "default", |
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| 429 | .type = AVMEDIA_TYPE_AUDIO, |
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| 430 | .filter_frame = filter_frame, |
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| 431 | }, |
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| 432 | { NULL } |
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| 433 | }; |
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| 434 | |||
| 435 | static const AVFilterPad outputs[] = { |
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| 436 | { |
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| 437 | .name = "default", |
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| 438 | .type = AVMEDIA_TYPE_AUDIO, |
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| 439 | .config_props = config_output, |
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| 440 | }, |
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| 441 | { NULL } |
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| 442 | }; |
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| 443 | |||
| 444 | #define OFFSET(x) offsetof(BiquadsContext, x) |
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| 445 | #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM |
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| 446 | |||
| 447 | #define DEFINE_BIQUAD_FILTER(name_, description_) \ |
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| 448 | AVFILTER_DEFINE_CLASS(name_); \ |
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| 449 | static av_cold int name_##_init(AVFilterContext *ctx) \ |
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| 450 | { \ |
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| 451 | BiquadsContext *p = ctx->priv; \ |
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| 452 | p->class = &name_##_class; \ |
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| 453 | p->filter_type = name_; \ |
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| 454 | return init(ctx); \ |
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| 455 | } \ |
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| 456 | \ |
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| 457 | AVFilter avfilter_af_##name_ = { \ |
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| 458 | .name = #name_, \ |
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| 459 | .description = NULL_IF_CONFIG_SMALL(description_), \ |
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| 460 | .priv_size = sizeof(BiquadsContext), \ |
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| 461 | .init = name_##_init, \ |
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| 462 | .uninit = uninit, \ |
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| 463 | .query_formats = query_formats, \ |
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| 464 | .inputs = inputs, \ |
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| 465 | .outputs = outputs, \ |
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| 466 | .priv_class = &name_##_class, \ |
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| 467 | } |
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| 468 | |||
| 469 | #if CONFIG_EQUALIZER_FILTER |
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| 470 | static const AVOption equalizer_options[] = { |
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| 471 | {"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 999999, FLAGS}, |
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| 472 | {"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 999999, FLAGS}, |
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| 473 | {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"}, |
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| 474 | {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"}, |
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| 475 | {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"}, |
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| 476 | {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"}, |
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| 477 | {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"}, |
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| 478 | {"width", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 999, FLAGS}, |
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| 479 | {"w", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 999, FLAGS}, |
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| 480 | {"gain", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS}, |
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| 481 | {"g", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS}, |
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| 482 | {NULL} |
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| 483 | }; |
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| 484 | |||
| 485 | DEFINE_BIQUAD_FILTER(equalizer, "Apply two-pole peaking equalization (EQ) filter."); |
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| 486 | #endif /* CONFIG_EQUALIZER_FILTER */ |
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| 487 | #if CONFIG_BASS_FILTER |
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| 488 | static const AVOption bass_options[] = { |
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| 489 | {"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=100}, 0, 999999, FLAGS}, |
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| 490 | {"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=100}, 0, 999999, FLAGS}, |
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| 491 | {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"}, |
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| 492 | {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"}, |
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| 493 | {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"}, |
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| 494 | {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"}, |
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| 495 | {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"}, |
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| 496 | {"width", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS}, |
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| 497 | {"w", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS}, |
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| 498 | {"gain", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS}, |
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| 499 | {"g", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS}, |
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| 500 | {NULL} |
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| 501 | }; |
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| 502 | |||
| 503 | DEFINE_BIQUAD_FILTER(bass, "Boost or cut lower frequencies."); |
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| 504 | #endif /* CONFIG_BASS_FILTER */ |
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| 505 | #if CONFIG_TREBLE_FILTER |
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| 506 | static const AVOption treble_options[] = { |
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| 507 | {"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS}, |
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| 508 | {"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS}, |
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| 509 | {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"}, |
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| 510 | {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"}, |
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| 511 | {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"}, |
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| 512 | {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"}, |
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| 513 | {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"}, |
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| 514 | {"width", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS}, |
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| 515 | {"w", "set shelf transition steep", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 99999, FLAGS}, |
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| 516 | {"gain", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS}, |
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| 517 | {"g", "set gain", OFFSET(gain), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -900, 900, FLAGS}, |
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| 518 | {NULL} |
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| 519 | }; |
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| 520 | |||
| 521 | DEFINE_BIQUAD_FILTER(treble, "Boost or cut upper frequencies."); |
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| 522 | #endif /* CONFIG_TREBLE_FILTER */ |
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| 523 | #if CONFIG_BANDPASS_FILTER |
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| 524 | static const AVOption bandpass_options[] = { |
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| 525 | {"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS}, |
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| 526 | {"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS}, |
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| 527 | {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"}, |
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| 528 | {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"}, |
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| 529 | {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"}, |
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| 530 | {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"}, |
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| 531 | {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"}, |
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| 532 | {"width", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 999, FLAGS}, |
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| 533 | {"w", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 999, FLAGS}, |
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| 534 | {"csg", "use constant skirt gain", OFFSET(csg), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, FLAGS}, |
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| 535 | {NULL} |
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| 536 | }; |
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| 537 | |||
| 538 | DEFINE_BIQUAD_FILTER(bandpass, "Apply a two-pole Butterworth band-pass filter."); |
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| 539 | #endif /* CONFIG_BANDPASS_FILTER */ |
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| 540 | #if CONFIG_BANDREJECT_FILTER |
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| 541 | static const AVOption bandreject_options[] = { |
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| 542 | {"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS}, |
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| 543 | {"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS}, |
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| 544 | {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"}, |
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| 545 | {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"}, |
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| 546 | {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"}, |
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| 547 | {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"}, |
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| 548 | {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"}, |
||
| 549 | {"width", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 999, FLAGS}, |
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| 550 | {"w", "set band-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0, 999, FLAGS}, |
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| 551 | {NULL} |
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| 552 | }; |
||
| 553 | |||
| 554 | DEFINE_BIQUAD_FILTER(bandreject, "Apply a two-pole Butterworth band-reject filter."); |
||
| 555 | #endif /* CONFIG_BANDREJECT_FILTER */ |
||
| 556 | #if CONFIG_LOWPASS_FILTER |
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| 557 | static const AVOption lowpass_options[] = { |
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| 558 | {"frequency", "set frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=500}, 0, 999999, FLAGS}, |
||
| 559 | {"f", "set frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=500}, 0, 999999, FLAGS}, |
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| 560 | {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"}, |
||
| 561 | {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"}, |
||
| 562 | {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"}, |
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| 563 | {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"}, |
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| 564 | {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"}, |
||
| 565 | {"width", "set width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.707}, 0, 99999, FLAGS}, |
||
| 566 | {"w", "set width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.707}, 0, 99999, FLAGS}, |
||
| 567 | {"poles", "set number of poles", OFFSET(poles), AV_OPT_TYPE_INT, {.i64=2}, 1, 2, FLAGS}, |
||
| 568 | {"p", "set number of poles", OFFSET(poles), AV_OPT_TYPE_INT, {.i64=2}, 1, 2, FLAGS}, |
||
| 569 | {NULL} |
||
| 570 | }; |
||
| 571 | |||
| 572 | DEFINE_BIQUAD_FILTER(lowpass, "Apply a low-pass filter with 3dB point frequency."); |
||
| 573 | #endif /* CONFIG_LOWPASS_FILTER */ |
||
| 574 | #if CONFIG_HIGHPASS_FILTER |
||
| 575 | static const AVOption highpass_options[] = { |
||
| 576 | {"frequency", "set frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS}, |
||
| 577 | {"f", "set frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS}, |
||
| 578 | {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HERTZ, SLOPE, FLAGS, "width_type"}, |
||
| 579 | {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"}, |
||
| 580 | {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"}, |
||
| 581 | {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"}, |
||
| 582 | {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"}, |
||
| 583 | {"width", "set width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.707}, 0, 99999, FLAGS}, |
||
| 584 | {"w", "set width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=0.707}, 0, 99999, FLAGS}, |
||
| 585 | {"poles", "set number of poles", OFFSET(poles), AV_OPT_TYPE_INT, {.i64=2}, 1, 2, FLAGS}, |
||
| 586 | {"p", "set number of poles", OFFSET(poles), AV_OPT_TYPE_INT, {.i64=2}, 1, 2, FLAGS}, |
||
| 587 | {NULL} |
||
| 588 | }; |
||
| 589 | |||
| 590 | DEFINE_BIQUAD_FILTER(highpass, "Apply a high-pass filter with 3dB point frequency."); |
||
| 591 | #endif /* CONFIG_HIGHPASS_FILTER */ |
||
| 592 | #if CONFIG_ALLPASS_FILTER |
||
| 593 | static const AVOption allpass_options[] = { |
||
| 594 | {"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS}, |
||
| 595 | {"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=3000}, 0, 999999, FLAGS}, |
||
| 596 | {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=HERTZ}, HERTZ, SLOPE, FLAGS, "width_type"}, |
||
| 597 | {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HERTZ}, 0, 0, FLAGS, "width_type"}, |
||
| 598 | {"q", "Q-Factor", 0, AV_OPT_TYPE_CONST, {.i64=QFACTOR}, 0, 0, FLAGS, "width_type"}, |
||
| 599 | {"o", "octave", 0, AV_OPT_TYPE_CONST, {.i64=OCTAVE}, 0, 0, FLAGS, "width_type"}, |
||
| 600 | {"s", "slope", 0, AV_OPT_TYPE_CONST, {.i64=SLOPE}, 0, 0, FLAGS, "width_type"}, |
||
| 601 | {"width", "set filter-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=707.1}, 0, 99999, FLAGS}, |
||
| 602 | {"w", "set filter-width", OFFSET(width), AV_OPT_TYPE_DOUBLE, {.dbl=707.1}, 0, 99999, FLAGS}, |
||
| 603 | {NULL} |
||
| 604 | }; |
||
| 605 | |||
| 606 | DEFINE_BIQUAD_FILTER(allpass, "Apply a two-pole all-pass filter."); |
||
| 607 | #endif /* CONFIG_ALLPASS_FILTER */ |
||
| 608 | #if CONFIG_BIQUAD_FILTER |
||
| 609 | static const AVOption biquad_options[] = { |
||
| 610 | {"a0", NULL, OFFSET(a0), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS}, |
||
| 611 | {"a1", NULL, OFFSET(a1), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS}, |
||
| 612 | {"a2", NULL, OFFSET(a2), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS}, |
||
| 613 | {"b0", NULL, OFFSET(b0), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS}, |
||
| 614 | {"b1", NULL, OFFSET(b1), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS}, |
||
| 615 | {"b2", NULL, OFFSET(b2), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MIN, INT16_MAX, FLAGS}, |
||
| 616 | {NULL} |
||
| 617 | }; |
||
| 618 | |||
| 619 | DEFINE_BIQUAD_FILTER(biquad, "Apply a biquad IIR filter with the given coefficients."); |
||
| 620 | #endif /* CONFIG_BIQUAD_FILTER */ |