313 lines
10 KiB
C
313 lines
10 KiB
C
/*
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* Copyright (C) 2001-2010 Krzysztof Foltman, Markus Schmidt, Thor Harald Johansen and others
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* Copyright (c) 2015 Paul B Mahol
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/**
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* @file
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* Sidechain compressor filter
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*/
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#include "libavutil/avassert.h"
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#include "libavutil/channel_layout.h"
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#include "libavutil/common.h"
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#include "libavutil/opt.h"
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#include "audio.h"
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#include "avfilter.h"
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#include "formats.h"
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#include "hermite.h"
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#include "internal.h"
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typedef struct SidechainCompressContext {
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const AVClass *class;
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double attack, attack_coeff;
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double release, release_coeff;
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double lin_slope;
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double ratio;
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double threshold;
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double makeup;
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double mix;
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double thres;
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double knee;
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double knee_start;
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double knee_stop;
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double lin_knee_start;
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double compressed_knee_stop;
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int link;
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int detection;
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AVFrame *input_frame[2];
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} SidechainCompressContext;
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#define OFFSET(x) offsetof(SidechainCompressContext, x)
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#define A AV_OPT_FLAG_AUDIO_PARAM
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#define F AV_OPT_FLAG_FILTERING_PARAM
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static const AVOption sidechaincompress_options[] = {
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{ "threshold", "set threshold", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0.125}, 0.000976563, 1, A|F },
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{ "ratio", "set ratio", OFFSET(ratio), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 1, 20, A|F },
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{ "attack", "set attack", OFFSET(attack), AV_OPT_TYPE_DOUBLE, {.dbl=20}, 0.01, 2000, A|F },
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{ "release", "set release", OFFSET(release), AV_OPT_TYPE_DOUBLE, {.dbl=250}, 0.01, 9000, A|F },
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{ "makeup", "set make up gain", OFFSET(makeup), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 1, 64, A|F },
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{ "knee", "set knee", OFFSET(knee), AV_OPT_TYPE_DOUBLE, {.dbl=2.82843}, 1, 8, A|F },
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{ "link", "set link type", OFFSET(link), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, A|F, "link" },
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{ "average", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A|F, "link" },
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{ "maximum", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A|F, "link" },
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{ "detection", "set detection", OFFSET(detection), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, A|F, "detection" },
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{ "peak", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A|F, "detection" },
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{ "rms", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A|F, "detection" },
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{ "mix", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, A|F },
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{ NULL }
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};
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AVFILTER_DEFINE_CLASS(sidechaincompress);
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static av_cold int init(AVFilterContext *ctx)
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{
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SidechainCompressContext *s = ctx->priv;
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s->thres = log(s->threshold);
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s->lin_knee_start = s->threshold / sqrt(s->knee);
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s->knee_start = log(s->lin_knee_start);
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s->knee_stop = log(s->threshold * sqrt(s->knee));
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s->compressed_knee_stop = (s->knee_stop - s->thres) / s->ratio + s->thres;
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return 0;
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}
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// A fake infinity value (because real infinity may break some hosts)
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#define FAKE_INFINITY (65536.0 * 65536.0)
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// Check for infinity (with appropriate-ish tolerance)
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#define IS_FAKE_INFINITY(value) (fabs(value-FAKE_INFINITY) < 1.0)
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static double output_gain(double lin_slope, double ratio, double thres,
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double knee, double knee_start, double knee_stop,
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double compressed_knee_stop, int detection)
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{
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double slope = log(lin_slope);
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double gain = 0.0;
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double delta = 0.0;
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if (detection)
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slope *= 0.5;
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if (IS_FAKE_INFINITY(ratio)) {
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gain = thres;
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delta = 0.0;
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} else {
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gain = (slope - thres) / ratio + thres;
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delta = 1.0 / ratio;
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}
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if (knee > 1.0 && slope < knee_stop)
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gain = hermite_interpolation(slope, knee_start, knee_stop,
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knee_start, compressed_knee_stop,
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1.0, delta);
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return exp(gain - slope);
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}
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static int filter_frame(AVFilterLink *link, AVFrame *frame)
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{
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AVFilterContext *ctx = link->dst;
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SidechainCompressContext *s = ctx->priv;
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AVFilterLink *sclink = ctx->inputs[1];
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AVFilterLink *outlink = ctx->outputs[0];
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const double makeup = s->makeup;
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const double mix = s->mix;
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const double *scsrc;
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double *sample;
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int nb_samples;
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int ret, i, c;
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for (i = 0; i < 2; i++)
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if (link == ctx->inputs[i])
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break;
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av_assert0(i < 2 && !s->input_frame[i]);
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s->input_frame[i] = frame;
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if (!s->input_frame[0] || !s->input_frame[1])
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return 0;
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nb_samples = FFMIN(s->input_frame[0]->nb_samples,
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s->input_frame[1]->nb_samples);
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sample = (double *)s->input_frame[0]->data[0];
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scsrc = (const double *)s->input_frame[1]->data[0];
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for (i = 0; i < nb_samples; i++) {
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double abs_sample, gain = 1.0;
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abs_sample = fabs(scsrc[0]);
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if (s->link == 1) {
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for (c = 1; c < sclink->channels; c++)
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abs_sample = FFMAX(fabs(scsrc[c]), abs_sample);
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} else {
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for (c = 1; c < sclink->channels; c++)
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abs_sample += fabs(scsrc[c]);
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abs_sample /= sclink->channels;
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}
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if (s->detection)
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abs_sample *= abs_sample;
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s->lin_slope += (abs_sample - s->lin_slope) * (abs_sample > s->lin_slope ? s->attack_coeff : s->release_coeff);
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if (s->lin_slope > 0.0 && s->lin_slope > s->lin_knee_start)
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gain = output_gain(s->lin_slope, s->ratio, s->thres, s->knee,
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s->knee_start, s->knee_stop,
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s->compressed_knee_stop, s->detection);
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for (c = 0; c < outlink->channels; c++)
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sample[c] *= (gain * makeup * mix + (1. - mix));
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sample += outlink->channels;
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scsrc += sclink->channels;
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}
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ret = ff_filter_frame(outlink, s->input_frame[0]);
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s->input_frame[0] = NULL;
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av_frame_free(&s->input_frame[1]);
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return ret;
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}
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static int request_frame(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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SidechainCompressContext *s = ctx->priv;
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int i, ret;
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/* get a frame on each input */
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for (i = 0; i < 2; i++) {
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AVFilterLink *inlink = ctx->inputs[i];
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if (!s->input_frame[i] &&
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(ret = ff_request_frame(inlink)) < 0)
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return ret;
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/* request the same number of samples on all inputs */
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if (i == 0)
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ctx->inputs[1]->request_samples = s->input_frame[0]->nb_samples;
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}
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return 0;
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}
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static int query_formats(AVFilterContext *ctx)
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{
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AVFilterFormats *formats;
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AVFilterChannelLayouts *layouts = NULL;
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static const enum AVSampleFormat sample_fmts[] = {
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AV_SAMPLE_FMT_DBL,
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AV_SAMPLE_FMT_NONE
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};
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int ret, i;
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if (!ctx->inputs[0]->in_channel_layouts ||
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!ctx->inputs[0]->in_channel_layouts->nb_channel_layouts) {
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av_log(ctx, AV_LOG_WARNING,
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"No channel layout for input 1\n");
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return AVERROR(EAGAIN);
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}
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if ((ret = ff_add_channel_layout(&layouts, ctx->inputs[0]->in_channel_layouts->channel_layouts[0])) < 0 ||
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(ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->in_channel_layouts)) < 0)
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return ret;
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for (i = 0; i < 2; i++) {
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layouts = ff_all_channel_counts();
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if ((ret = ff_channel_layouts_ref(layouts, &ctx->inputs[i]->out_channel_layouts)) < 0)
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return ret;
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}
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formats = ff_make_format_list(sample_fmts);
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if ((ret = ff_set_common_formats(ctx, formats)) < 0)
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return ret;
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formats = ff_all_samplerates();
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return ff_set_common_samplerates(ctx, formats);
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}
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static int config_output(AVFilterLink *outlink)
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{
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AVFilterContext *ctx = outlink->src;
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SidechainCompressContext *s = ctx->priv;
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if (ctx->inputs[0]->sample_rate != ctx->inputs[1]->sample_rate) {
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av_log(ctx, AV_LOG_ERROR,
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"Inputs must have the same sample rate "
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"%d for in0 vs %d for in1\n",
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ctx->inputs[0]->sample_rate, ctx->inputs[1]->sample_rate);
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return AVERROR(EINVAL);
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}
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outlink->sample_rate = ctx->inputs[0]->sample_rate;
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outlink->time_base = ctx->inputs[0]->time_base;
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outlink->channel_layout = ctx->inputs[0]->channel_layout;
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outlink->channels = ctx->inputs[0]->channels;
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s->attack_coeff = FFMIN(1., 1. / (s->attack * outlink->sample_rate / 4000.));
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s->release_coeff = FFMIN(1., 1. / (s->release * outlink->sample_rate / 4000.));
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return 0;
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}
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static const AVFilterPad sidechaincompress_inputs[] = {
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{
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.name = "main",
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.type = AVMEDIA_TYPE_AUDIO,
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.filter_frame = filter_frame,
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.needs_writable = 1,
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.needs_fifo = 1,
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},{
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.name = "sidechain",
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.type = AVMEDIA_TYPE_AUDIO,
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.filter_frame = filter_frame,
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.needs_fifo = 1,
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},
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{ NULL }
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};
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static const AVFilterPad sidechaincompress_outputs[] = {
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{
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.name = "default",
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.type = AVMEDIA_TYPE_AUDIO,
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.config_props = config_output,
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.request_frame = request_frame,
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},
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{ NULL }
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};
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AVFilter ff_af_sidechaincompress = {
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.name = "sidechaincompress",
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.description = NULL_IF_CONFIG_SMALL("Sidechain compressor."),
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.priv_size = sizeof(SidechainCompressContext),
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.priv_class = &sidechaincompress_class,
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.init = init,
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.query_formats = query_formats,
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.inputs = sidechaincompress_inputs,
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.outputs = sidechaincompress_outputs,
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};
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