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/*
* Copyright (c) 2018 Chris Johnson
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "avfilter.h"
#include "audio.h"
typedef struct DeesserChannel {
double s1, s2, s3;
double m1, m2;
double ratioA, ratioB;
double iirSampleA, iirSampleB;
int flip;
} DeesserChannel;
typedef struct DeesserContext {
const AVClass *class;
double intensity;
double max;
double frequency;
int mode;
DeesserChannel *chan;
} DeesserContext;
enum OutModes {
IN_MODE,
OUT_MODE,
ESS_MODE,
NB_MODES
};
#define OFFSET(x) offsetof(DeesserContext, x)
#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
static const AVOption deesser_options[] = {
{ "i", "set intensity", OFFSET(intensity), AV_OPT_TYPE_DOUBLE, {.dbl=0.0}, 0.0, 1.0, A },
{ "m", "set max deessing", OFFSET(max), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0.0, 1.0, A },
{ "f", "set frequency", OFFSET(frequency), AV_OPT_TYPE_DOUBLE, {.dbl=0.5}, 0.0, 1.0, A },
{ "s", "set output mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=OUT_MODE}, 0, NB_MODES-1, A, .unit = "mode" },
{ "i", "input", 0, AV_OPT_TYPE_CONST, {.i64=IN_MODE}, 0, 0, A, .unit = "mode" },
{ "o", "output", 0, AV_OPT_TYPE_CONST, {.i64=OUT_MODE}, 0, 0, A, .unit = "mode" },
{ "e", "ess", 0, AV_OPT_TYPE_CONST, {.i64=ESS_MODE}, 0, 0, A, .unit = "mode" },
{ NULL }
};
AVFILTER_DEFINE_CLASS(deesser);
static int config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
DeesserContext *s = ctx->priv;
s->chan = av_calloc(inlink->ch_layout.nb_channels, sizeof(*s->chan));
if (!s->chan)
return AVERROR(ENOMEM);
for (int i = 0; i < inlink->ch_layout.nb_channels; i++) {
DeesserChannel *chan = &s->chan[i];
chan->ratioA = chan->ratioB = 1.0;
}
return 0;
}
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
{
AVFilterContext *ctx = inlink->dst;
AVFilterLink *outlink = ctx->outputs[0];
DeesserContext *s = ctx->priv;
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);
}
for (int ch = 0; ch < inlink->ch_layout.nb_channels; ch++) {
DeesserChannel *dec = &s->chan[ch];
double *src = (double *)in->extended_data[ch];
double *dst = (double *)out->extended_data[ch];
double overallscale = inlink->sample_rate < 44100 ? 44100.0 / inlink->sample_rate : inlink->sample_rate / 44100.0;
double intensity = pow(s->intensity, 5) * (8192 / overallscale);
double maxdess = 1.0 / pow(10.0, ((s->max - 1.0) * 48.0) / 20);
double iirAmount = pow(s->frequency, 2) / overallscale;
double offset;
double sense;
double recovery;
double attackspeed;
for (int i = 0; i < in->nb_samples; i++) {
double sample = src[i];
dec->s3 = dec->s2;
dec->s2 = dec->s1;
dec->s1 = sample;
dec->m1 = (dec->s1 - dec->s2) * ((dec->s1 - dec->s2) / 1.3);
dec->m2 = (dec->s2 - dec->s3) * ((dec->s1 - dec->s2) / 1.3);
sense = (dec->m1 - dec->m2) * ((dec->m1 - dec->m2) / 1.3);
attackspeed = 7.0 + sense * 1024;
sense = 1.0 + intensity * intensity * sense;
sense = FFMIN(sense, intensity);
recovery = 1.0 + (0.01 / sense);
offset = 1.0 - fabs(sample);
if (dec->flip) {
dec->iirSampleA = (dec->iirSampleA * (1.0 - (offset * iirAmount))) +
(sample * (offset * iirAmount));
if (dec->ratioA < sense) {
dec->ratioA = ((dec->ratioA * attackspeed) + sense) / (attackspeed + 1.0);
} else {
dec->ratioA = 1.0 + ((dec->ratioA - 1.0) / recovery);
}
dec->ratioA = FFMIN(dec->ratioA, maxdess);
sample = dec->iirSampleA + ((sample - dec->iirSampleA) / dec->ratioA);
} else {
dec->iirSampleB = (dec->iirSampleB * (1.0 - (offset * iirAmount))) +
(sample * (offset * iirAmount));
if (dec->ratioB < sense) {
dec->ratioB = ((dec->ratioB * attackspeed) + sense) / (attackspeed + 1.0);
} else {
dec->ratioB = 1.0 + ((dec->ratioB - 1.0) / recovery);
}
dec->ratioB = FFMIN(dec->ratioB, maxdess);
sample = dec->iirSampleB + ((sample - dec->iirSampleB) / dec->ratioB);
}
dec->flip = !dec->flip;
if (ctx->is_disabled)
sample = src[i];
switch (s->mode) {
case IN_MODE: dst[i] = src[i]; break;
case OUT_MODE: dst[i] = sample; break;
case ESS_MODE: dst[i] = src[i] - sample; break;
}
}
}
if (out != in)
av_frame_free(&in);
return ff_filter_frame(outlink, out);
}
static av_cold void uninit(AVFilterContext *ctx)
{
DeesserContext *s = ctx->priv;
av_freep(&s->chan);
}
static const AVFilterPad inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.filter_frame = filter_frame,
.config_props = config_input,
},
};
const AVFilter ff_af_deesser = {
.name = "deesser",
.description = NULL_IF_CONFIG_SMALL("Apply de-essing to the audio."),
.priv_size = sizeof(DeesserContext),
.priv_class = &deesser_class,
.uninit = uninit,
FILTER_INPUTS(inputs),
FILTER_OUTPUTS(ff_audio_default_filterpad),
FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_DBLP),
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_INTERNAL,
};
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