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