/*
+ * Copyright (c) 2005 Boðaç Topaktaþ
+ * Copyright (c) 2020 Paul B Mahol
+ *
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
const AVClass *class;
double cutoff;
+ double level;
+ double qfactor;
+ int order;
+ int filter_count;
int bypass;
- BiquadCoeffs coeffs[5];
+ BiquadCoeffs coeffs[10];
AVFrame *w;
+
+ int (*filter_channels)(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs);
} ASuperCutContext;
static int query_formats(AVFilterContext *ctx)
AVFilterFormats *formats = NULL;
AVFilterChannelLayouts *layouts = NULL;
static const enum AVSampleFormat sample_fmts[] = {
+ AV_SAMPLE_FMT_FLTP,
AV_SAMPLE_FMT_DBLP,
AV_SAMPLE_FMT_NONE
};
return ff_set_common_samplerates(ctx, formats);
}
+static void calc_q_factors(int n, double *q)
+{
+ for (int i = 0; i < n / 2; i++)
+ q[i] = 1. / (-2. * cos(M_PI * (2. * (i + 1) + n - 1.) / (2. * n)));
+}
+
static int get_coeffs(AVFilterContext *ctx)
{
ASuperCutContext *s = ctx->priv;
AVFilterLink *inlink = ctx->inputs[0];
double w0 = s->cutoff / inlink->sample_rate;
double K = tan(M_PI * w0);
- double q[5];
+ double q[10];
s->bypass = w0 >= 0.5;
if (s->bypass)
return 0;
- q[0] = 0.50623256;
- q[1] = 0.56116312;
- q[2] = 0.70710678;
- q[3] = 1.10134463;
- q[4] = 3.19622661;
-
- for (int b = 0; b < 5; b++) {
- BiquadCoeffs *coeffs = &s->coeffs[b];
- double norm = 1.0 / (1.0 + K / q[b] + K * K);
-
- coeffs->b0 = K * K * norm;
- coeffs->b1 = 2.0 * coeffs->b0;
- coeffs->b2 = coeffs->b0;
- coeffs->a1 = -2.0 * (K * K - 1.0) * norm;
- coeffs->a2 = -(1.0 - K / q[b] + K * K) * norm;
- }
+ if (!strcmp(ctx->filter->name, "asubcut")) {
+ s->filter_count = s->order / 2 + (s->order & 1);
- return 0;
-}
+ calc_q_factors(s->order, q);
-static int config_input(AVFilterLink *inlink)
-{
- AVFilterContext *ctx = inlink->dst;
- ASuperCutContext *s = ctx->priv;
+ if (s->order & 1) {
+ BiquadCoeffs *coeffs = &s->coeffs[0];
+ double omega = 2. * tan(M_PI * w0);
- s->w = ff_get_audio_buffer(inlink, 2 * 5);
- if (!s->w)
- return AVERROR(ENOMEM);
+ coeffs->b0 = 2. / (2. + omega);
+ coeffs->b1 = -coeffs->b0;
+ coeffs->b2 = 0.;
+ coeffs->a1 = -(omega - 2.) / (2. + omega);
+ coeffs->a2 = 0.;
+ }
- return get_coeffs(ctx);
+ for (int b = (s->order & 1); b < s->filter_count; b++) {
+ BiquadCoeffs *coeffs = &s->coeffs[b];
+ const int idx = b - (s->order & 1);
+ double norm = 1.0 / (1.0 + K / q[idx] + K * K);
+
+ coeffs->b0 = norm;
+ coeffs->b1 = -2.0 * coeffs->b0;
+ coeffs->b2 = coeffs->b0;
+ coeffs->a1 = -2.0 * (K * K - 1.0) * norm;
+ coeffs->a2 = -(1.0 - K / q[idx] + K * K) * norm;
+ }
+ } else if (!strcmp(ctx->filter->name, "asupercut")) {
+ s->filter_count = s->order / 2 + (s->order & 1);
+
+ calc_q_factors(s->order, q);
+
+ if (s->order & 1) {
+ BiquadCoeffs *coeffs = &s->coeffs[0];
+ double omega = 2. * tan(M_PI * w0);
+
+ coeffs->b0 = omega / (2. + omega);
+ coeffs->b1 = coeffs->b0;
+ coeffs->b2 = 0.;
+ coeffs->a1 = -(omega - 2.) / (2. + omega);
+ coeffs->a2 = 0.;
+ }
+
+ for (int b = (s->order & 1); b < s->filter_count; b++) {
+ BiquadCoeffs *coeffs = &s->coeffs[b];
+ const int idx = b - (s->order & 1);
+ double norm = 1.0 / (1.0 + K / q[idx] + K * K);
+
+ coeffs->b0 = K * K * norm;
+ coeffs->b1 = 2.0 * coeffs->b0;
+ coeffs->b2 = coeffs->b0;
+ coeffs->a1 = -2.0 * (K * K - 1.0) * norm;
+ coeffs->a2 = -(1.0 - K / q[idx] + K * K) * norm;
+ }
+ } else if (!strcmp(ctx->filter->name, "asuperpass")) {
+ double alpha, beta, gamma, theta;
+ double theta_0 = 2. * M_PI * (s->cutoff / inlink->sample_rate);
+ double d_E;
+
+ s->filter_count = s->order / 2;
+ d_E = (2. * tan(theta_0 / (2. * s->qfactor))) / sin(theta_0);
+
+ for (int b = 0; b < s->filter_count; b += 2) {
+ double D = 2. * sin(((b + 1) * M_PI) / (2. * s->filter_count));
+ double A = (1. + pow((d_E / 2.), 2)) / (D * d_E / 2.);
+ double d = sqrt((d_E * D) / (A + sqrt(A * A - 1.)));
+ double B = D * (d_E / 2.) / d;
+ double W = B + sqrt(B * B - 1.);
+
+ for (int j = 0; j < 2; j++) {
+ BiquadCoeffs *coeffs = &s->coeffs[b + j];
+
+ if (j == 1)
+ theta = 2. * atan(tan(theta_0 / 2.) / W);
+ else
+ theta = 2. * atan(W * tan(theta_0 / 2.));
+
+ beta = 0.5 * ((1. - (d / 2.) * sin(theta)) / (1. + (d / 2.) * sin(theta)));
+ gamma = (0.5 + beta) * cos(theta);
+ alpha = 0.5 * (0.5 - beta) * sqrt(1. + pow((W - (1. / W)) / d, 2.));
+
+ coeffs->a1 = 2. * gamma;
+ coeffs->a2 = -2. * beta;
+ coeffs->b0 = 2. * alpha;
+ coeffs->b1 = 0.;
+ coeffs->b2 = -2. * alpha;
+ }
+ }
+ } else if (!strcmp(ctx->filter->name, "asuperstop")) {
+ double alpha, beta, gamma, theta;
+ double theta_0 = 2. * M_PI * (s->cutoff / inlink->sample_rate);
+ double d_E;
+
+ s->filter_count = s->order / 2;
+ d_E = (2. * tan(theta_0 / (2. * s->qfactor))) / sin(theta_0);
+
+ for (int b = 0; b < s->filter_count; b += 2) {
+ double D = 2. * sin(((b + 1) * M_PI) / (2. * s->filter_count));
+ double A = (1. + pow((d_E / 2.), 2)) / (D * d_E / 2.);
+ double d = sqrt((d_E * D) / (A + sqrt(A * A - 1.)));
+ double B = D * (d_E / 2.) / d;
+ double W = B + sqrt(B * B - 1.);
+
+ for (int j = 0; j < 2; j++) {
+ BiquadCoeffs *coeffs = &s->coeffs[b + j];
+
+ if (j == 1)
+ theta = 2. * atan(tan(theta_0 / 2.) / W);
+ else
+ theta = 2. * atan(W * tan(theta_0 / 2.));
+
+ beta = 0.5 * ((1. - (d / 2.) * sin(theta)) / (1. + (d / 2.) * sin(theta)));
+ gamma = (0.5 + beta) * cos(theta);
+ alpha = 0.5 * (0.5 + beta) * ((1. - cos(theta)) / (1. - cos(theta_0)));
+
+ coeffs->a1 = 2. * gamma;
+ coeffs->a2 = -2. * beta;
+ coeffs->b0 = 2. * alpha;
+ coeffs->b1 = -4. * alpha * cos(theta_0);
+ coeffs->b2 = 2. * alpha;
+ }
+ }
+ }
+
+ return 0;
}
typedef struct ThreadData {
AVFrame *in, *out;
} ThreadData;
-static int filter_channels(AVFilterContext *ctx, void *arg, int jobnr, int nb_jobs)
-{
- ASuperCutContext *s = ctx->priv;
- ThreadData *td = arg;
- AVFrame *out = td->out;
- AVFrame *in = td->in;
- const int start = (in->channels * jobnr) / nb_jobs;
- const int end = (in->channels * (jobnr+1)) / nb_jobs;
-
- for (int ch = start; ch < end; ch++) {
- const double *src = (const double *)in->extended_data[ch];
- double *dst = (double *)out->extended_data[ch];
-
- for (int b = 0; b < 5; b++) {
- BiquadCoeffs *coeffs = &s->coeffs[b];
- const double a1 = coeffs->a1;
- const double a2 = coeffs->a2;
- const double b0 = coeffs->b0;
- const double b1 = coeffs->b1;
- const double b2 = coeffs->b2;
- double *w = ((double *)s->w->extended_data[ch]) + b * 2;
+#define FILTER(name, type) \
+static int filter_channels_## name(AVFilterContext *ctx, void *arg, \
+ int jobnr, int nb_jobs) \
+{ \
+ ASuperCutContext *s = ctx->priv; \
+ ThreadData *td = arg; \
+ AVFrame *out = td->out; \
+ AVFrame *in = td->in; \
+ const int start = (in->channels * jobnr) / nb_jobs; \
+ const int end = (in->channels * (jobnr+1)) / nb_jobs; \
+ const double level = s->level; \
+ \
+ for (int ch = start; ch < end; ch++) { \
+ const type *src = (const type *)in->extended_data[ch]; \
+ type *dst = (type *)out->extended_data[ch]; \
+ \
+ for (int b = 0; b < s->filter_count; b++) { \
+ BiquadCoeffs *coeffs = &s->coeffs[b]; \
+ const type a1 = coeffs->a1; \
+ const type a2 = coeffs->a2; \
+ const type b0 = coeffs->b0; \
+ const type b1 = coeffs->b1; \
+ const type b2 = coeffs->b2; \
+ type *w = ((type *)s->w->extended_data[ch]) + b * 2; \
+ \
+ for (int n = 0; n < in->nb_samples; n++) { \
+ type sin = b ? dst[n] : src[n] * level; \
+ type sout = sin * b0 + w[0]; \
+ \
+ w[0] = b1 * sin + w[1] + a1 * sout; \
+ w[1] = b2 * sin + a2 * sout; \
+ \
+ dst[n] = sout; \
+ } \
+ } \
+ } \
+ \
+ return 0; \
+}
- for (int n = 0; n < in->nb_samples; n++) {
- double sin = b ? dst[n] : src[n];
- double sout = sin * b0 + w[0];
+FILTER(fltp, float)
+FILTER(dblp, double)
- w[0] = b1 * sin + w[1] + a1 * sout;
- w[1] = b2 * sin + a2 * sout;
+static int config_input(AVFilterLink *inlink)
+{
+ AVFilterContext *ctx = inlink->dst;
+ ASuperCutContext *s = ctx->priv;
- dst[n] = sout;
- }
- }
+ switch (inlink->format) {
+ case AV_SAMPLE_FMT_FLTP: s->filter_channels = filter_channels_fltp; break;
+ case AV_SAMPLE_FMT_DBLP: s->filter_channels = filter_channels_dblp; break;
}
- return 0;
+ s->w = ff_get_audio_buffer(inlink, 2 * 10);
+ if (!s->w)
+ return AVERROR(ENOMEM);
+
+ return get_coeffs(ctx);
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
}
td.in = in; td.out = out;
- ctx->internal->execute(ctx, filter_channels, &td, NULL, FFMIN(inlink->channels,
- ff_filter_get_nb_threads(ctx)));
+ ctx->internal->execute(ctx, s->filter_channels, &td, NULL, FFMIN(inlink->channels,
+ ff_filter_get_nb_threads(ctx)));
if (out != in)
av_frame_free(&in);
static const AVOption asupercut_options[] = {
{ "cutoff", "set cutoff frequency", OFFSET(cutoff), AV_OPT_TYPE_DOUBLE, {.dbl=20000}, 20000, 192000, FLAGS },
+ { "order", "set filter order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=10}, 3, 20, FLAGS },
+ { "level", "set input level", OFFSET(level), AV_OPT_TYPE_DOUBLE, {.dbl=1.}, 0., 1., FLAGS },
{ NULL }
};
{ NULL }
};
-AVFilter ff_af_asupercut = {
+const AVFilter ff_af_asupercut = {
.name = "asupercut",
.description = NULL_IF_CONFIG_SMALL("Cut super frequencies."),
.query_formats = query_formats,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC |
AVFILTER_FLAG_SLICE_THREADS,
};
+
+static const AVOption asubcut_options[] = {
+ { "cutoff", "set cutoff frequency", OFFSET(cutoff), AV_OPT_TYPE_DOUBLE, {.dbl=20}, 2, 200, FLAGS },
+ { "order", "set filter order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=10}, 3, 20, FLAGS },
+ { "level", "set input level", OFFSET(level), AV_OPT_TYPE_DOUBLE, {.dbl=1.}, 0., 1., FLAGS },
+ { NULL }
+};
+
+AVFILTER_DEFINE_CLASS(asubcut);
+
+const AVFilter ff_af_asubcut = {
+ .name = "asubcut",
+ .description = NULL_IF_CONFIG_SMALL("Cut subwoofer frequencies."),
+ .query_formats = query_formats,
+ .priv_size = sizeof(ASuperCutContext),
+ .priv_class = &asubcut_class,
+ .uninit = uninit,
+ .inputs = inputs,
+ .outputs = outputs,
+ .process_command = process_command,
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC |
+ AVFILTER_FLAG_SLICE_THREADS,
+};
+
+static const AVOption asuperpass_asuperstop_options[] = {
+ { "centerf","set center frequency", OFFSET(cutoff), AV_OPT_TYPE_DOUBLE, {.dbl=1000}, 2, 999999, FLAGS },
+ { "order", "set filter order", OFFSET(order), AV_OPT_TYPE_INT, {.i64=4}, 4, 20, FLAGS },
+ { "qfactor","set Q-factor", OFFSET(qfactor),AV_OPT_TYPE_DOUBLE, {.dbl=1.},0.01, 100., FLAGS },
+ { "level", "set input level", OFFSET(level), AV_OPT_TYPE_DOUBLE, {.dbl=1.}, 0., 2., FLAGS },
+ { NULL }
+};
+
+#define asuperpass_options asuperpass_asuperstop_options
+AVFILTER_DEFINE_CLASS(asuperpass);
+
+const AVFilter ff_af_asuperpass = {
+ .name = "asuperpass",
+ .description = NULL_IF_CONFIG_SMALL("Apply high order Butterworth band-pass filter."),
+ .query_formats = query_formats,
+ .priv_size = sizeof(ASuperCutContext),
+ .priv_class = &asuperpass_class,
+ .uninit = uninit,
+ .inputs = inputs,
+ .outputs = outputs,
+ .process_command = process_command,
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC |
+ AVFILTER_FLAG_SLICE_THREADS,
+};
+
+#define asuperstop_options asuperpass_asuperstop_options
+AVFILTER_DEFINE_CLASS(asuperstop);
+
+const AVFilter ff_af_asuperstop = {
+ .name = "asuperstop",
+ .description = NULL_IF_CONFIG_SMALL("Apply high order Butterworth band-stop filter."),
+ .query_formats = query_formats,
+ .priv_size = sizeof(ASuperCutContext),
+ .priv_class = &asuperstop_class,
+ .uninit = uninit,
+ .inputs = inputs,
+ .outputs = outputs,
+ .process_command = process_command,
+ .flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC |
+ AVFILTER_FLAG_SLICE_THREADS,
+};
projects / ffmpeg / blobdiff