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- /*
- * 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
- */
- #include <float.h>
- #include "libavutil/opt.h"
- #include "avfilter.h"
- #include "audio.h"
- #include "formats.h"
- #include "hermite.h"
- typedef struct AudioDynamicEqualizerContext {
- const AVClass *class;
- double threshold;
- double dfrequency;
- double dqfactor;
- double tfrequency;
- double tqfactor;
- double ratio;
- double range;
- double makeup;
- double knee;
- double slew;
- double attack;
- double release;
- double attack_coef;
- double release_coef;
- int mode;
- AVFrame *state;
- } AudioDynamicEqualizerContext;
- static int config_input(AVFilterLink *inlink)
- {
- AVFilterContext *ctx = inlink->dst;
- AudioDynamicEqualizerContext *s = ctx->priv;
- s->state = ff_get_audio_buffer(inlink, 8);
- if (!s->state)
- return AVERROR(ENOMEM);
- return 0;
- }
- static double get_svf(double in, double *m, double *a, double *b)
- {
- const double v0 = in;
- const double v3 = v0 - b[1];
- const double v1 = a[0] * b[0] + a[1] * v3;
- const double v2 = b[1] + a[1] * b[0] + a[2] * v3;
- b[0] = 2. * v1 - b[0];
- b[1] = 2. * v2 - b[1];
- return m[0] * v0 + m[1] * v1 + m[2] * v2;
- }
- static inline double from_dB(double x)
- {
- return exp(0.05 * x * M_LN10);
- }
- static inline double to_dB(double x)
- {
- return 20. * log10(x);
- }
- static inline double sqr(double x)
- {
- return x * x;
- }
- static double get_gain(double in, double srate, double makeup,
- double aattack, double iratio, double knee, double range,
- double thresdb, double slewfactor, double *state,
- double attack_coeff, double release_coeff, double nc)
- {
- double width = (6. * knee) + 0.01;
- double cdb = 0.;
- double Lgain = 1.;
- double Lxg, Lxl, Lyg, Lyl, Ly1;
- double checkwidth = 0.;
- double slewwidth = 1.8;
- int attslew = 0;
- Lyg = 0.;
- Lxg = to_dB(fabs(in) + DBL_EPSILON);
- Lyg = Lxg + (iratio - 1.) * sqr(Lxg - thresdb + width * .5) / (2. * width);
- checkwidth = 2. * fabs(Lxg - thresdb);
- if (2. * (Lxg - thresdb) < -width) {
- Lyg = Lxg;
- } else if (checkwidth <= width) {
- Lyg = thresdb + (Lxg - thresdb) * iratio;
- if (checkwidth <= slewwidth) {
- if (Lyg >= state[2])
- attslew = 1;
- }
- } else if (2. * (Lxg-thresdb) > width) {
- Lyg = thresdb + (Lxg - thresdb) * iratio;
- }
- attack_coeff = attslew ? aattack : attack_coeff;
- Lxl = Lxg - Lyg;
- Ly1 = fmaxf(Lxl, release_coeff * state[1] +(1. - release_coeff) * Lxl);
- Lyl = attack_coeff * state[0] + (1. - attack_coeff) * Ly1;
- cdb = -Lyl;
- Lgain = from_dB(nc * fmin(cdb - makeup, range));
- state[0] = Lyl;
- state[1] = Ly1;
- state[2] = Lyg;
- return Lgain;
- }
- typedef struct ThreadData {
- AVFrame *in, *out;
- } ThreadData;
- static int filter_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
- {
- AudioDynamicEqualizerContext *s = ctx->priv;
- ThreadData *td = arg;
- AVFrame *in = td->in;
- AVFrame *out = td->out;
- const double sample_rate = in->sample_rate;
- const double makeup = s->makeup;
- const double iratio = 1. / s->ratio;
- const double range = s->range;
- const double dfrequency = fmin(s->dfrequency, sample_rate * 0.5);
- const double tfrequency = fmin(s->tfrequency, sample_rate * 0.5);
- const double threshold = log(s->threshold + DBL_EPSILON);
- const double release = s->release_coef;
- const double attack = s->attack_coef;
- const double dqfactor = s->dqfactor;
- const double tqfactor = s->tqfactor;
- const double fg = tan(M_PI * tfrequency / sample_rate);
- const double dg = tan(M_PI * dfrequency / sample_rate);
- const int start = (in->channels * jobnr) / nb_jobs;
- const int end = (in->channels * (jobnr+1)) / nb_jobs;
- const int mode = s->mode;
- const double knee = s->knee;
- const double slew = s->slew;
- const double aattack = exp(-1000. / ((s->attack + 2.0 * (slew - 1.)) * sample_rate));
- const double nc = mode == 0 ? 1. : -1.;
- double da[3], dm[3];
- {
- double k = 1. / dqfactor;
- da[0] = 1. / (1. + dg * (dg + k));
- da[1] = dg * da[0];
- da[2] = dg * da[1];
- dm[0] = 0.;
- dm[1] = 1.;
- dm[2] = 0.;
- }
- for (int ch = start; ch < end; ch++) {
- const double *src = (const double *)in->extended_data[ch];
- double *dst = (double *)out->extended_data[ch];
- double *state = (double *)s->state->extended_data[ch];
- for (int n = 0; n < out->nb_samples; n++) {
- double detect, gain, v, listen;
- double fa[3], fm[3];
- detect = listen = get_svf(src[n], dm, da, state);
- detect = fabs(detect);
- gain = get_gain(detect, sample_rate, makeup,
- aattack, iratio, knee, range, threshold, slew,
- &state[4], attack, release, nc);
- {
- double k = 1. / (tqfactor * gain);
- fa[0] = 1. / (1. + fg * (fg + k));
- fa[1] = fg * fa[0];
- fa[2] = fg * fa[1];
- fm[0] = 1.;
- fm[1] = k * (gain * gain - 1.);
- fm[2] = 0.;
- }
- v = get_svf(src[n], fm, fa, &state[2]);
- v = mode == -1 ? listen : v;
- dst[n] = ctx->is_disabled ? src[n] : v;
- }
- }
- return 0;
- }
- static double get_coef(double x, double sr)
- {
- return exp(-1000. / (x * sr));
- }
- static int filter_frame(AVFilterLink *inlink, AVFrame *in)
- {
- AVFilterContext *ctx = inlink->dst;
- AVFilterLink *outlink = ctx->outputs[0];
- AudioDynamicEqualizerContext *s = ctx->priv;
- ThreadData td;
- AVFrame *out;
- if (av_frame_is_writable(in)) {
- out = in;
- } else {
- out = ff_get_audio_buffer(outlink, in->nb_samples);
- if (!out) {
- av_frame_free(&in);
- return AVERROR(ENOMEM);
- }
- av_frame_copy_props(out, in);
- }
- s->attack_coef = get_coef(s->attack, in->sample_rate);
- s->release_coef = get_coef(s->release, in->sample_rate);
- td.in = in;
- td.out = out;
- ff_filter_execute(ctx, filter_channels, &td, NULL,
- FFMIN(outlink->channels, ff_filter_get_nb_threads(ctx)));
- if (out != in)
- av_frame_free(&in);
- return ff_filter_frame(outlink, out);
- }
- static av_cold void uninit(AVFilterContext *ctx)
- {
- AudioDynamicEqualizerContext *s = ctx->priv;
- av_frame_free(&s->state);
- }
- #define OFFSET(x) offsetof(AudioDynamicEqualizerContext, x)
- #define FLAGS AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
- static const AVOption adynamicequalizer_options[] = {
- { "threshold", "set detection threshold", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 100, FLAGS },
- { "dfrequency", "set detection frequency", OFFSET(dfrequency), AV_OPT_TYPE_DOUBLE, {.dbl=1000}, 2, 1000000, FLAGS },
- { "dqfactor", "set detection Q factor", OFFSET(dqfactor), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.001, 1000, FLAGS },
- { "tfrequency", "set target frequency", OFFSET(tfrequency), AV_OPT_TYPE_DOUBLE, {.dbl=1000}, 2, 1000000, FLAGS },
- { "tqfactor", "set target Q factor", OFFSET(tqfactor), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.001, 1000, FLAGS },
- { "attack", "set attack duration", OFFSET(attack), AV_OPT_TYPE_DOUBLE, {.dbl=20}, 1, 2000, FLAGS },
- { "release", "set release duration", OFFSET(release), AV_OPT_TYPE_DOUBLE, {.dbl=200}, 1, 2000, FLAGS },
- { "knee", "set knee factor", OFFSET(knee), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 8, FLAGS },
- { "ratio", "set ratio factor", OFFSET(ratio), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 1, 20, FLAGS },
- { "makeup", "set makeup gain", OFFSET(makeup), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 30, FLAGS },
- { "range", "set max gain", OFFSET(range), AV_OPT_TYPE_DOUBLE, {.dbl=0}, 0, 200, FLAGS },
- { "slew", "set slew factor", OFFSET(slew), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 1, 200, FLAGS },
- { "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, -1, 1, FLAGS, "mode" },
- { "listen", 0, 0, AV_OPT_TYPE_CONST, {.i64=-1}, 0, 0, FLAGS, "mode" },
- { "cut", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, FLAGS, "mode" },
- { "boost", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, FLAGS, "mode" },
- { NULL }
- };
- AVFILTER_DEFINE_CLASS(adynamicequalizer);
- static const AVFilterPad inputs[] = {
- {
- .name = "default",
- .type = AVMEDIA_TYPE_AUDIO,
- .filter_frame = filter_frame,
- .config_props = config_input,
- },
- };
- static const AVFilterPad outputs[] = {
- {
- .name = "default",
- .type = AVMEDIA_TYPE_AUDIO,
- },
- };
- const AVFilter ff_af_adynamicequalizer = {
- .name = "adynamicequalizer",
- .description = NULL_IF_CONFIG_SMALL("Apply Dynamic Equalization of input audio."),
- .priv_size = sizeof(AudioDynamicEqualizerContext),
- .priv_class = &adynamicequalizer_class,
- .uninit = uninit,
- FILTER_INPUTS(inputs),
- FILTER_OUTPUTS(outputs),
- FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_DBLP),
- .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL |
- AVFILTER_FLAG_SLICE_THREADS,
- .process_command = ff_filter_process_command,
- };
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