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FFmpeg/libavfilter/af_aexciter.c
Andreas Rheinhardt 790f793844 avutil/common: Don't auto-include mem.h 
There are lots of files that don't need it: The number of object
files that actually need it went down from 2011 to 884 here.

Keep it for external users in order to not cause breakages.

Also improve the other headers a bit while just at it.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-03-31 00:08:43 +01:00

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/*
* Copyright (c) Markus Schmidt and Christian Holschuh
*
* 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 "libavutil/mem.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "internal.h"
#include "audio.h"
typedef struct ChannelParams {
double blend_old, drive_old;
double rdrive, rbdr, kpa, kpb, kna, knb, ap,
an, imr, kc, srct, sq, pwrq;
double prev_med, prev_out;
double hp[5], lp[5];
double hw[4][2], lw[2][2];
} ChannelParams;
typedef struct AExciterContext {
const AVClass *class;
double level_in;
double level_out;
double amount;
double drive;
double blend;
double freq;
double ceil;
int listen;
ChannelParams *cp;
} AExciterContext;
#define OFFSET(x) offsetof(AExciterContext, x)
#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM
static const AVOption aexciter_options[] = {
{ "level_in", "set level in", OFFSET(level_in), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 64, A },
{ "level_out", "set level out", OFFSET(level_out), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 64, A },
{ "amount", "set amount", OFFSET(amount), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 64, A },
{ "drive", "set harmonics", OFFSET(drive), AV_OPT_TYPE_DOUBLE, {.dbl=8.5}, 0.1, 10, A },
{ "blend", "set blend harmonics", OFFSET(blend), AV_OPT_TYPE_DOUBLE, {.dbl=0}, -10, 10, A },
{ "freq", "set scope", OFFSET(freq), AV_OPT_TYPE_DOUBLE, {.dbl=7500}, 2000, 12000, A },
{ "ceil", "set ceiling", OFFSET(ceil), AV_OPT_TYPE_DOUBLE, {.dbl=9999}, 9999, 20000, A },
{ "listen", "enable listen mode", OFFSET(listen), AV_OPT_TYPE_BOOL, {.i64=0}, 0, 1, A },
{ NULL }
};
AVFILTER_DEFINE_CLASS(aexciter);
static inline double M(double x)
{
return (fabs(x) > 0.00000001) ? x : 0.0;
}
static inline double D(double x)
{
x = fabs(x);
return (x > 0.00000001) ? sqrt(x) : 0.0;
}
static void set_params(ChannelParams *p,
double blend, double drive,
double srate, double freq,
double ceil)
{
double a0, a1, a2, b0, b1, b2, w0, alpha;
p->rdrive = 12.0 / drive;
p->rbdr = p->rdrive / (10.5 - blend) * 780.0 / 33.0;
p->kpa = D(2.0 * (p->rdrive*p->rdrive) - 1.0) + 1.0;
p->kpb = (2.0 - p->kpa) / 2.0;
p->ap = ((p->rdrive*p->rdrive) - p->kpa + 1.0) / 2.0;
p->kc = p->kpa / D(2.0 * D(2.0 * (p->rdrive*p->rdrive) - 1.0) - 2.0 * p->rdrive*p->rdrive);
p->srct = (0.1 * srate) / (0.1 * srate + 1.0);
p->sq = p->kc*p->kc + 1.0;
p->knb = -1.0 * p->rbdr / D(p->sq);
p->kna = 2.0 * p->kc * p->rbdr / D(p->sq);
p->an = p->rbdr*p->rbdr / p->sq;
p->imr = 2.0 * p->knb + D(2.0 * p->kna + 4.0 * p->an - 1.0);
p->pwrq = 2.0 / (p->imr + 1.0);
w0 = 2 * M_PI * freq / srate;
alpha = sin(w0) / (2. * 0.707);
a0 = 1 + alpha;
a1 = -2 * cos(w0);
a2 = 1 - alpha;
b0 = (1 + cos(w0)) / 2;
b1 = -(1 + cos(w0));
b2 = (1 + cos(w0)) / 2;
p->hp[0] =-a1 / a0;
p->hp[1] =-a2 / a0;
p->hp[2] = b0 / a0;
p->hp[3] = b1 / a0;
p->hp[4] = b2 / a0;
w0 = 2 * M_PI * ceil / srate;
alpha = sin(w0) / (2. * 0.707);
a0 = 1 + alpha;
a1 = -2 * cos(w0);
a2 = 1 - alpha;
b0 = (1 - cos(w0)) / 2;
b1 = 1 - cos(w0);
b2 = (1 - cos(w0)) / 2;
p->lp[0] =-a1 / a0;
p->lp[1] =-a2 / a0;
p->lp[2] = b0 / a0;
p->lp[3] = b1 / a0;
p->lp[4] = b2 / a0;
}
static double bprocess(double in, const double *const c,
double *w1, double *w2)
{
double out = c[2] * in + *w1;
*w1 = c[3] * in + *w2 + c[0] * out;
*w2 = c[4] * in + c[1] * out;
return out;
}
static double distortion_process(AExciterContext *s, ChannelParams *p, double in)
{
double proc = in, med;
proc = bprocess(proc, p->hp, &p->hw[0][0], &p->hw[0][1]);
proc = bprocess(proc, p->hp, &p->hw[1][0], &p->hw[1][1]);
if (proc >= 0.0) {
med = (D(p->ap + proc * (p->kpa - proc)) + p->kpb) * p->pwrq;
} else {
med = (D(p->an - proc * (p->kna + proc)) + p->knb) * p->pwrq * -1.0;
}
proc = p->srct * (med - p->prev_med + p->prev_out);
p->prev_med = M(med);
p->prev_out = M(proc);
proc = bprocess(proc, p->hp, &p->hw[2][0], &p->hw[2][1]);
proc = bprocess(proc, p->hp, &p->hw[3][0], &p->hw[3][1]);
if (s->ceil >= 10000.) {
proc = bprocess(proc, p->lp, &p->lw[0][0], &p->lw[0][1]);
proc = bprocess(proc, p->lp, &p->lw[1][0], &p->lw[1][1]);
}
return proc;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AExciterContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
AVFrame *out;
const double *src = (const double *)in->data[0];
const double level_in = s->level_in;
const double level_out = s->level_out;
const double amount = s->amount;
const double listen = 1.0 - s->listen;
double *dst;
if (av_frame_is_writable(in)) {
out = in;
} else {
out = ff_get_audio_buffer(inlink, in->nb_samples);
if (!out) {
av_frame_free(&in);
return AVERROR(ENOMEM);
}
av_frame_copy_props(out, in);
}
dst = (double *)out->data[0];
for (int n = 0; n < in->nb_samples; n++) {
for (int c = 0; c < inlink->ch_layout.nb_channels; c++) {
double sample = src[c] * level_in;
sample = distortion_process(s, &s->cp[c], sample);
sample = sample * amount + listen * src[c];
sample *= level_out;
if (ctx->is_disabled)
dst[c] = src[c];
else
dst[c] = sample;
}
src += inlink->ch_layout.nb_channels;
dst += inlink->ch_layout.nb_channels;
}
if (in != out)
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static av_cold void uninit(AVFilterContext *ctx)
{
AExciterContext *s = ctx->priv;
av_freep(&s->cp);
}
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
AExciterContext *s = ctx->priv;
if (!s->cp)
s->cp = av_calloc(inlink->ch_layout.nb_channels, sizeof(*s->cp));
if (!s->cp)
return AVERROR(ENOMEM);
for (int i = 0; i < inlink->ch_layout.nb_channels; i++)
set_params(&s->cp[i], s->blend, s->drive, inlink->sample_rate,
s->freq, s->ceil);
return 0;
}
static int process_command(AVFilterContext *ctx, const char *cmd, const char *args,
char *res, int res_len, int flags)
{
AVFilterLink *inlink = ctx->inputs[0];
int ret;
ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags);
if (ret < 0)
return ret;
return config_input(inlink);
}
static const AVFilterPad avfilter_af_aexciter_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.config_props = config_input,
.filter_frame = filter_frame,
},
};
const AVFilter ff_af_aexciter = {
.name = "aexciter",
.description = NULL_IF_CONFIG_SMALL("Enhance high frequency part of audio."),
.priv_size = sizeof(AExciterContext),
.priv_class = &aexciter_class,
.uninit = uninit,
FILTER_INPUTS(avfilter_af_aexciter_inputs),
FILTER_OUTPUTS(ff_audio_default_filterpad),
FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_DBL),
.process_command = process_command,
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
};
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