diff options
Diffstat (limited to 'libavfilter/af_biquads.c')
-rw-r--r-- | libavfilter/af_biquads.c | 627 |
1 files changed, 627 insertions, 0 deletions
diff --git a/libavfilter/af_biquads.c b/libavfilter/af_biquads.c new file mode 100644 index 0000000000..0bd61fda32 --- /dev/null +++ b/libavfilter/af_biquads.c @@ -0,0 +1,627 @@ +/* + * Copyright (c) 2013 Paul B Mahol + * Copyright (c) 2006-2008 Rob Sykes <robs@users.sourceforge.net> + * + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +/* + * 2-pole filters designed by Robert Bristow-Johnson <rbj@audioimagination.com> + * see http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt + * + * 1-pole filters based on code (c) 2000 Chris Bagwell <cbagwell@sprynet.com> + * Algorithms: Recursive single pole low/high pass filter + * Reference: The Scientist and Engineer's Guide to Digital Signal Processing + * + * low-pass: output[N] = input[N] * A + output[N-1] * B + * X = exp(-2.0 * pi * Fc) + * A = 1 - X + * B = X + * Fc = cutoff freq / sample rate + * + * Mimics an RC low-pass filter: + * + * ---/\/\/\/\-----------> + * | + * --- C + * --- + * | + * | + * V + * + * high-pass: output[N] = A0 * input[N] + A1 * input[N-1] + B1 * output[N-1] + * X = exp(-2.0 * pi * Fc) + * A0 = (1 + X) / 2 + * A1 = -(1 + X) / 2 + * B1 = X + * Fc = cutoff freq / sample rate + * + * Mimics an RC high-pass filter: + * + * || C + * ----||---------> + * || | + * < + * > R + * < + * | + * V + */ + +#include "libavutil/opt.h" +#include "libavutil/avassert.h" +#include "audio.h" +#include "avfilter.h" +#include "internal.h" + +enum FilterType { + biquad, + equalizer, + bass, + treble, + band, + bandpass, + bandreject, + allpass, + highpass, + lowpass, +}; + +enum WidthType { + NONE, + HZ, + OCTAVE, + QFACTOR, + SLOPE, +}; + +typedef struct ChanCache { + double i1, i2; + double o1, o2; +} ChanCache; + +typedef struct { + const AVClass *class; + + enum FilterType filter_type; + enum WidthType width_type; + int poles; + int csg; + + double gain; + double frequency; + double width; + + double a0, a1, a2; + double b0, b1, b2; + + ChanCache *cache; + + void (*filter)(const void *ibuf, void *obuf, int len, + double *i1, double *i2, double *o1, double *o2, + double b0, double b1, double b2, double a1, double a2); +} BiquadsContext; + +static av_cold int init(AVFilterContext *ctx, const char *args) +{ + BiquadsContext *p = ctx->priv; + int ret; + + av_opt_set_defaults(p); + + if ((ret = av_set_options_string(p, args, "=", ":")) < 0) + return ret; + + if (p->filter_type != biquad) { + if (p->frequency <= 0 || p->width <= 0) { + av_log(ctx, AV_LOG_ERROR, "Invalid frequency %f and/or width %f <= 0\n", + p->frequency, p->width); + return AVERROR(EINVAL); + } + } + + return 0; +} + +static int query_formats(AVFilterContext *ctx) +{ + AVFilterFormats *formats; + AVFilterChannelLayouts *layouts; + static const enum AVSampleFormat sample_fmts[] = { + AV_SAMPLE_FMT_S16P, + AV_SAMPLE_FMT_S32P, + AV_SAMPLE_FMT_FLTP, + AV_SAMPLE_FMT_DBLP, + AV_SAMPLE_FMT_NONE + }; + + layouts = ff_all_channel_layouts(); + if (!layouts) + return AVERROR(ENOMEM); + ff_set_common_channel_layouts(ctx, layouts); + + formats = ff_make_format_list(sample_fmts); + if (!formats) + return AVERROR(ENOMEM); + ff_set_common_formats(ctx, formats); + + formats = ff_all_samplerates(); + if (!formats) + return AVERROR(ENOMEM); + ff_set_common_samplerates(ctx, formats); + + return 0; +} + +#define BIQUAD_FILTER(name, type, min, max) \ +static void biquad_## name (const void *input, void *output, int len, \ + double *in1, double *in2, \ + double *out1, double *out2, \ + double b0, double b1, double b2, \ + double a1, double a2) \ +{ \ + const type *ibuf = input; \ + type *obuf = output; \ + double i1 = *in1; \ + double i2 = *in2; \ + double o1 = *out1; \ + double o2 = *out2; \ + int i; \ + a1 = -a1; \ + a2 = -a2; \ + \ + for (i = 0; i+1 < len; i++) { \ + o2 = i2 * b2 + i1 * b1 + ibuf[i] * b0 + o2 * a2 + o1 * a1; \ + i2 = ibuf[i]; \ + if (o2 < min) { \ + av_log(NULL, AV_LOG_WARNING, "clipping\n"); \ + obuf[i] = min; \ + } else if (o2 > max) { \ + av_log(NULL, AV_LOG_WARNING, "clipping\n"); \ + obuf[i] = max; \ + } else { \ + obuf[i] = o2; \ + } \ + i++; \ + o1 = i1 * b2 + i2 * b1 + ibuf[i] * b0 + o1 * a2 + o2 * a1; \ + i1 = ibuf[i]; \ + if (o1 < min) { \ + av_log(NULL, AV_LOG_WARNING, "clipping\n"); \ + obuf[i] = min; \ + } else if (o1 > max) { \ + av_log(NULL, AV_LOG_WARNING, "clipping\n"); \ + obuf[i] = max; \ + } else { \ + obuf[i] = o1; \ + } \ + } \ + if (i < len) { \ + double o0 = ibuf[i] * b0 + i1 * b1 + i2 * b2 + o1 * a1 + o2 * a2; \ + i2 = i1; \ + i1 = ibuf[i]; \ + o2 = o1; \ + o1 = o0; \ + if (o0 < min) { \ + av_log(NULL, AV_LOG_WARNING, "clipping\n"); \ + obuf[i] = min; \ + } else if (o0 > max) { \ + av_log(NULL, AV_LOG_WARNING, "clipping\n"); \ + obuf[i] = max; \ + } else { \ + obuf[i] = o0; \ + } \ + } \ + *in1 = i1; \ + *in2 = i2; \ + *out1 = o1; \ + *out2 = o2; \ +} + +BIQUAD_FILTER(s16, int16_t, INT16_MIN, INT16_MAX) +BIQUAD_FILTER(s32, int32_t, INT32_MIN, INT32_MAX) +BIQUAD_FILTER(flt, float, -1., 1.) +BIQUAD_FILTER(dbl, double, -1., 1.) + +static int config_output(AVFilterLink *outlink) +{ + AVFilterContext *ctx = outlink->src; + BiquadsContext *p = ctx->priv; + AVFilterLink *inlink = ctx->inputs[0]; + double A = exp(p->gain / 40 * log(10.)); + double w0 = 2 * M_PI * p->frequency / inlink->sample_rate; + double alpha; + + if (w0 > M_PI) { + av_log(ctx, AV_LOG_ERROR, + "Invalid frequency %f. Frequency must be less than half the sample-rate %d.\n", + p->frequency, inlink->sample_rate); + return AVERROR(EINVAL); + } + + switch (p->width_type) { + case NONE: + alpha = 0.0; + break; + case HZ: + alpha = sin(w0) / (2 * p->frequency / p->width); + break; + case OCTAVE: + alpha = sin(w0) * sinh(log(2.) / 2 * p->width * w0 / sin(w0)); + break; + case QFACTOR: + alpha = sin(w0) / (2 * p->width); + break; + case SLOPE: + alpha = sin(w0) / 2 * sqrt((A + 1 / A) * (1 / p->width - 1) + 2); + break; + default: + av_assert0(0); + } + + switch (p->filter_type) { + case biquad: + break; + case equalizer: + p->a0 = 1 + alpha / A; + p->a1 = -2 * cos(w0); + p->a2 = 1 - alpha / A; + p->b0 = 1 + alpha * A; + p->b1 = -2 * cos(w0); + p->b2 = 1 - alpha * A; + break; + case bass: + p->a0 = (A + 1) + (A - 1) * cos(w0) + 2 * sqrt(A) * alpha; + p->a1 = -2 * ((A - 1) + (A + 1) * cos(w0)); + p->a2 = (A + 1) + (A - 1) * cos(w0) - 2 * sqrt(A) * alpha; + p->b0 = A * ((A + 1) - (A - 1) * cos(w0) + 2 * sqrt(A) * alpha); + p->b1 = 2 * A * ((A - 1) - (A + 1) * cos(w0)); + p->b2 = A * ((A + 1) - (A - 1) * cos(w0) - 2 * sqrt(A) * alpha); + break; + case treble: + p->a0 = (A + 1) - (A - 1) * cos(w0) + 2 * sqrt(A) * alpha; + p->a1 = 2 * ((A - 1) - (A + 1) * cos(w0)); + p->a2 = (A + 1) - (A - 1) * cos(w0) - 2 * sqrt(A) * alpha; + p->b0 = A * ((A + 1) + (A - 1) * cos(w0) + 2 * sqrt(A) * alpha); + p->b1 =-2 * A * ((A - 1) + (A + 1) * cos(w0)); + p->b2 = A * ((A + 1) + (A - 1) * cos(w0) - 2 * sqrt(A) * alpha); + break; + case bandpass: + if (p->csg) { + p->a0 = 1 + alpha; + p->a1 = -2 * cos(w0); + p->a2 = 1 - alpha; + p->b0 = sin(w0) / 2; + p->b1 = 0; + p->b2 = -sin(w0) / 2; + } else { + p->a0 = 1 + alpha; + p->a1 = -2 * cos(w0); + p->a2 = 1 - alpha; + p->b0 = alpha; + p->b1 = 0; + p->b2 = -alpha; + } + break; + case bandreject: + p->a0 = 1 + alpha; + p->a1 = -2 * cos(w0); + p->a2 = 1 - alpha; + p->b0 = 1; + p->b1 = -2 * cos(w0); + p->b2 = 1; + break; + case lowpass: + if (p->poles == 1) { + p->a0 = 1; + p->a1 = -exp(-w0); + p->a2 = 0; + p->b0 = 1 + p->a1; + p->b1 = 0; + p->b2 = 0; + } else { + p->a0 = 1 + alpha; + p->a1 = -2 * cos(w0); + p->a2 = 1 - alpha; + p->b0 = (1 - cos(w0)) / 2; + p->b1 = 1 - cos(w0); + p->b2 = (1 - cos(w0)) / 2; + } + break; + case highpass: + if (p->poles == 1) { + p->a0 = 1; + p->a1 = -exp(-w0); + p->a2 = 0; + p->b0 = (1 - p->a1) / 2; + p->b1 = -p->b0; + p->b2 = 0; + } else { + p->a0 = 1 + alpha; + p->a1 = -2 * cos(w0); + p->a2 = 1 - alpha; + p->b0 = (1 + cos(w0)) / 2; + p->b1 = -(1 + cos(w0)); + p->b2 = (1 + cos(w0)) / 2; + } + break; + case allpass: + p->a0 = 1 + alpha; + p->a1 = -2 * cos(w0); + p->a2 = 1 - alpha; + p->b0 = 1 - alpha; + p->b1 = -2 * cos(w0); + p->b2 = 1 + alpha; + break; + default: + av_assert0(0); + } + + p->a1 /= p->a0; + p->a2 /= p->a0; + p->b0 /= p->a0; + p->b1 /= p->a0; + p->b2 /= p->a0; + + p->cache = av_realloc_f(p->cache, sizeof(ChanCache), inlink->channels); + if (!p->cache) + return AVERROR(ENOMEM); + memset(p->cache, 0, sizeof(ChanCache) * inlink->channels); + + switch (inlink->format) { + case AV_SAMPLE_FMT_S16P: p->filter = biquad_s16; break; + case AV_SAMPLE_FMT_S32P: p->filter = biquad_s32; break; + case AV_SAMPLE_FMT_FLTP: p->filter = biquad_flt; break; + case AV_SAMPLE_FMT_DBLP: p->filter = biquad_dbl; break; + default: av_assert0(0); + } + + return 0; +} + +static int filter_frame(AVFilterLink *inlink, AVFrame *buf) +{ + BiquadsContext *p = inlink->dst->priv; + AVFilterLink *outlink = inlink->dst->outputs[0]; + AVFrame *out_buf; + int nb_samples = buf->nb_samples; + int ch; + + if (av_frame_is_writable(buf)) { + out_buf = buf; + } else { + out_buf = ff_get_audio_buffer(inlink, nb_samples); + if (!out_buf) + return AVERROR(ENOMEM); + out_buf->pts = buf->pts; + } + + for (ch = 0; ch < av_frame_get_channels(buf); ch++) + p->filter(buf->extended_data[ch], + out_buf->extended_data[ch], nb_samples, + &p->cache[ch].i1, &p->cache[ch].i2, + &p->cache[ch].o1, &p->cache[ch].o2, + p->b0, p->b1, p->b2, p->a1, p->a2); + + if (buf != out_buf) + av_frame_free(&buf); + + return ff_filter_frame(outlink, out_buf); +} + +static av_cold void uninit(AVFilterContext *ctx) +{ + BiquadsContext *p = ctx->priv; + + av_freep(&p->cache); + av_opt_free(p); +} + +static const AVFilterPad inputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + .filter_frame = filter_frame, + }, + { NULL } +}; + +static const AVFilterPad outputs[] = { + { + .name = "default", + .type = AVMEDIA_TYPE_AUDIO, + .config_props = config_output, + }, + { NULL } +}; + +#define OFFSET(x) offsetof(BiquadsContext, x) +#define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM + +#define DEFINE_BIQUAD_FILTER(name_, description_) \ +AVFILTER_DEFINE_CLASS(name_); \ +static av_cold int name_##_init(AVFilterContext *ctx, const char *args) \ +{ \ + BiquadsContext *p = ctx->priv; \ + p->class = &name_##_class; \ + p->filter_type = name_; \ + return init(ctx, args); \ +} \ + \ +AVFilter avfilter_af_##name_ = { \ + .name = #name_, \ + .description = NULL_IF_CONFIG_SMALL(description_), \ + .priv_size = sizeof(BiquadsContext), \ + .init = name_##_init, \ + .uninit = uninit, \ + .query_formats = query_formats, \ + .inputs = inputs, \ + .outputs = outputs, \ + .priv_class = &name_##_class, \ +} + +#if CONFIG_EQUALIZER_FILTER +static const AVOption equalizer_options[] = { + {"frequency", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 999999, FLAGS}, + {"f", "set central frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 999999, FLAGS}, + {"width_type", "set filter-width type", OFFSET(width_type), AV_OPT_TYPE_INT, {.i64=QFACTOR}, HZ, SLOPE, FLAGS, "width_type"}, + {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HZ}, 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=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}, HZ, SLOPE, FLAGS, "width_type"}, + {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HZ}, 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}, HZ, SLOPE, FLAGS, "width_type"}, + {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HZ}, 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}, HZ, SLOPE, FLAGS, "width_type"}, + {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HZ}, 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_INT, {.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}, HZ, SLOPE, FLAGS, "width_type"}, + {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HZ}, 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}, HZ, SLOPE, FLAGS, "width_type"}, + {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HZ}, 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}, HZ, SLOPE, FLAGS, "width_type"}, + {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HZ}, 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=HZ}, HZ, SLOPE, FLAGS, "width_type"}, + {"h", "Hz", 0, AV_OPT_TYPE_CONST, {.i64=HZ}, 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_MAX, INT16_MAX, FLAGS}, + {"a1", NULL, OFFSET(a1), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MAX, INT16_MAX, FLAGS}, + {"a2", NULL, OFFSET(a2), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MAX, INT16_MAX, FLAGS}, + {"b0", NULL, OFFSET(b0), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MAX, INT16_MAX, FLAGS}, + {"b1", NULL, OFFSET(b1), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MAX, INT16_MAX, FLAGS}, + {"b2", NULL, OFFSET(b2), AV_OPT_TYPE_DOUBLE, {.dbl=1}, INT16_MAX, INT16_MAX, FLAGS}, + {NULL}, +}; + +DEFINE_BIQUAD_FILTER(biquad, "Apply a biquad IIR filter with the given coefficients."); +#endif /* CONFIG_BIQUAD_FILTER */ |