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/* |
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* Copyright (C) 2001-2010 Krzysztof Foltman, Markus Schmidt, Thor Harald Johansen, Damien Zammit |
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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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* Audio (Sidechain) Gate filter |
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*/ |
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#include "libavutil/audio_fifo.h" |
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#include "libavutil/avassert.h" |
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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 "filters.h" |
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#include "formats.h" |
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#include "hermite.h" |
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typedef struct AudioGateContext { |
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const AVClass *class; |
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double level_in; |
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double level_sc; |
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double attack; |
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double release; |
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double threshold; |
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double ratio; |
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double knee; |
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double makeup; |
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double range; |
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int link; |
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int detection; |
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int mode; |
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double thres; |
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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 lin_knee_stop; |
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double lin_slope; |
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double attack_coeff; |
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double release_coeff; |
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AVAudioFifo *fifo[2]; |
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int64_t pts; |
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} AudioGateContext; |
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#define OFFSET(x) offsetof(AudioGateContext, x) |
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#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM|AV_OPT_FLAG_RUNTIME_PARAM |
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static const AVOption options[] = { |
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{ "level_in", "set input level", OFFSET(level_in), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A }, |
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{ "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, A, "mode" }, |
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{ "downward",0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A, "mode" }, |
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{ "upward", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A, "mode" }, |
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{ "range", "set max gain reduction", OFFSET(range), AV_OPT_TYPE_DOUBLE, {.dbl=0.06125}, 0, 1, A }, |
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{ "threshold", "set threshold", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0.125}, 0, 1, A }, |
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{ "ratio", "set ratio", OFFSET(ratio), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 1, 9000, A }, |
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{ "attack", "set attack", OFFSET(attack), AV_OPT_TYPE_DOUBLE, {.dbl=20}, 0.01, 9000, A }, |
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{ "release", "set release", OFFSET(release), AV_OPT_TYPE_DOUBLE, {.dbl=250}, 0.01, 9000, A }, |
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{ "makeup", "set makeup gain", OFFSET(makeup), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 1, 64, A }, |
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{ "knee", "set knee", OFFSET(knee), AV_OPT_TYPE_DOUBLE, {.dbl=2.828427125}, 1, 8, A }, |
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{ "detection", "set detection", OFFSET(detection), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, A, "detection" }, |
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{ "peak", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A, "detection" }, |
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{ "rms", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A, "detection" }, |
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{ "link", "set link", OFFSET(link), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, A, "link" }, |
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{ "average", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A, "link" }, |
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{ "maximum", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A, "link" }, |
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{ "level_sc", "set sidechain gain", OFFSET(level_sc), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A }, |
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{ NULL } |
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}; |
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static int agate_config_input(AVFilterLink *inlink) |
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{ |
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AVFilterContext *ctx = inlink->dst; |
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AudioGateContext *s = ctx->priv; |
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double lin_threshold = s->threshold; |
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double lin_knee_sqrt = sqrt(s->knee); |
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✓✗ |
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if (s->detection) |
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lin_threshold *= lin_threshold; |
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✓✗ |
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s->attack_coeff = FFMIN(1., 1. / (s->attack * inlink->sample_rate / 4000.)); |
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✓✗ |
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s->release_coeff = FFMIN(1., 1. / (s->release * inlink->sample_rate / 4000.)); |
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s->lin_knee_stop = lin_threshold * lin_knee_sqrt; |
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s->lin_knee_start = lin_threshold / lin_knee_sqrt; |
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s->thres = log(lin_threshold); |
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s->knee_start = log(s->lin_knee_start); |
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s->knee_stop = log(s->lin_knee_stop); |
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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 range, int mode) |
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{ |
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double slope = log(lin_slope); |
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double tratio = ratio; |
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double gain = 0.; |
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double delta = 0.; |
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✗✓ |
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if (IS_FAKE_INFINITY(ratio)) |
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tratio = 1000.; |
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gain = (slope - thres) * tratio + thres; |
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delta = tratio; |
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✗✓ |
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if (mode) { |
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if (knee > 1. && slope < knee_stop) |
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gain = hermite_interpolation(slope, knee_stop, knee_start, ((knee_stop - thres) * tratio + thres), knee_start, delta, 1.); |
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} else { |
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✗✓✗✗
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if (knee > 1. && slope > knee_start) |
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gain = hermite_interpolation(slope, knee_start, knee_stop, ((knee_start - thres) * tratio + thres), knee_stop, delta, 1.); |
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} |
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✗✓ |
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return FFMAX(range, exp(gain - slope)); |
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} |
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static void gate(AudioGateContext *s, |
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const double *src, double *dst, const double *scsrc, |
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int nb_samples, double level_in, double level_sc, |
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AVFilterLink *inlink, AVFilterLink *sclink) |
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{ |
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const double makeup = s->makeup; |
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const double attack_coeff = s->attack_coeff; |
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const double release_coeff = s->release_coeff; |
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int n, c; |
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✓✓ |
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for (n = 0; n < nb_samples; n++, src += inlink->channels, dst += inlink->channels, scsrc += sclink->channels) { |
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double abs_sample = fabs(scsrc[0] * level_sc), gain = 1.0; |
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int detected; |
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✗✓ |
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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] * level_sc), abs_sample); |
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} else { |
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✓✓ |
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for (c = 1; c < sclink->channels; c++) |
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abs_sample += fabs(scsrc[c] * level_sc); |
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abs_sample /= sclink->channels; |
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} |
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✓✗ |
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if (s->detection) |
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abs_sample *= abs_sample; |
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✓✓ |
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s->lin_slope += (abs_sample - s->lin_slope) * (abs_sample > s->lin_slope ? attack_coeff : release_coeff); |
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✗✓ |
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if (s->mode) |
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detected = s->lin_slope > s->lin_knee_start; |
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else |
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detected = s->lin_slope < s->lin_knee_stop; |
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✓✗✓✓
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if (s->lin_slope > 0.0 && detected) |
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gain = output_gain(s->lin_slope, s->ratio, s->thres, |
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s->knee, s->knee_start, s->knee_stop, |
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s->range, s->mode); |
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✓✓ |
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for (c = 0; c < inlink->channels; c++) |
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dst[c] = src[c] * level_in * gain * makeup; |
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} |
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} |
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#if CONFIG_AGATE_FILTER |
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#define agate_options options |
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AVFILTER_DEFINE_CLASS(agate); |
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static int query_formats(AVFilterContext *ctx) |
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{ |
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AVFilterFormats *formats = NULL; |
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AVFilterChannelLayouts *layouts; |
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int ret; |
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✗✓ |
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if ((ret = ff_add_format(&formats, AV_SAMPLE_FMT_DBL)) < 0) |
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return ret; |
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ret = ff_set_common_formats(ctx, formats); |
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✗✓ |
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if (ret < 0) |
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return ret; |
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layouts = ff_all_channel_counts(); |
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✗✓ |
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if (!layouts) |
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return AVERROR(ENOMEM); |
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ret = ff_set_common_channel_layouts(ctx, layouts); |
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✗✓ |
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if (ret < 0) |
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return ret; |
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formats = ff_all_samplerates(); |
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✗✓ |
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if (!formats) |
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return AVERROR(ENOMEM); |
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return ff_set_common_samplerates(ctx, formats); |
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} |
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static int filter_frame(AVFilterLink *inlink, AVFrame *in) |
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{ |
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const double *src = (const double *)in->data[0]; |
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AVFilterContext *ctx = inlink->dst; |
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AVFilterLink *outlink = ctx->outputs[0]; |
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AudioGateContext *s = ctx->priv; |
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AVFrame *out; |
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double *dst; |
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✓✗ |
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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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dst = (double *)out->data[0]; |
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gate(s, src, dst, src, in->nb_samples, |
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s->level_in, s->level_in, inlink, inlink); |
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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 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 = agate_config_input, |
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}, |
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{ NULL } |
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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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{ NULL } |
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}; |
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AVFilter ff_af_agate = { |
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.name = "agate", |
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.description = NULL_IF_CONFIG_SMALL("Audio gate."), |
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.query_formats = query_formats, |
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.priv_size = sizeof(AudioGateContext), |
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.priv_class = &agate_class, |
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.inputs = inputs, |
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.outputs = outputs, |
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.process_command = ff_filter_process_command, |
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.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
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}; |
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#endif /* CONFIG_AGATE_FILTER */ |
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#if CONFIG_SIDECHAINGATE_FILTER |
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#define sidechaingate_options options |
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AVFILTER_DEFINE_CLASS(sidechaingate); |
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static int activate(AVFilterContext *ctx) |
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{ |
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AudioGateContext *s = ctx->priv; |
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AVFrame *out = NULL, *in[2] = { NULL }; |
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int ret, i, nb_samples; |
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double *dst; |
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FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[0], ctx); |
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if ((ret = ff_inlink_consume_frame(ctx->inputs[0], &in[0])) > 0) { |
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av_audio_fifo_write(s->fifo[0], (void **)in[0]->extended_data, |
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in[0]->nb_samples); |
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av_frame_free(&in[0]); |
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} |
295 |
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if (ret < 0) |
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return ret; |
297 |
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if ((ret = ff_inlink_consume_frame(ctx->inputs[1], &in[1])) > 0) { |
298 |
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av_audio_fifo_write(s->fifo[1], (void **)in[1]->extended_data, |
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in[1]->nb_samples); |
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av_frame_free(&in[1]); |
301 |
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} |
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if (ret < 0) |
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return ret; |
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nb_samples = FFMIN(av_audio_fifo_size(s->fifo[0]), av_audio_fifo_size(s->fifo[1])); |
306 |
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if (nb_samples) { |
307 |
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out = ff_get_audio_buffer(ctx->outputs[0], nb_samples); |
308 |
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if (!out) |
309 |
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return AVERROR(ENOMEM); |
310 |
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for (i = 0; i < 2; i++) { |
311 |
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in[i] = ff_get_audio_buffer(ctx->inputs[i], nb_samples); |
312 |
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if (!in[i]) { |
313 |
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av_frame_free(&in[0]); |
314 |
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av_frame_free(&in[1]); |
315 |
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av_frame_free(&out); |
316 |
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return AVERROR(ENOMEM); |
317 |
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} |
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av_audio_fifo_read(s->fifo[i], (void **)in[i]->data, nb_samples); |
319 |
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} |
320 |
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dst = (double *)out->data[0]; |
322 |
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out->pts = s->pts; |
323 |
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s->pts += av_rescale_q(nb_samples, (AVRational){1, ctx->outputs[0]->sample_rate}, ctx->outputs[0]->time_base); |
324 |
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325 |
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gate(s, (double *)in[0]->data[0], dst, |
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(double *)in[1]->data[0], nb_samples, |
327 |
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s->level_in, s->level_sc, |
328 |
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ctx->inputs[0], ctx->inputs[1]); |
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330 |
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av_frame_free(&in[0]); |
331 |
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av_frame_free(&in[1]); |
332 |
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333 |
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ret = ff_filter_frame(ctx->outputs[0], out); |
334 |
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if (ret < 0) |
335 |
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return ret; |
336 |
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} |
337 |
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FF_FILTER_FORWARD_STATUS(ctx->inputs[0], ctx->outputs[0]); |
338 |
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FF_FILTER_FORWARD_STATUS(ctx->inputs[1], ctx->outputs[0]); |
339 |
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if (ff_outlink_frame_wanted(ctx->outputs[0])) { |
340 |
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if (!av_audio_fifo_size(s->fifo[0])) |
341 |
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ff_inlink_request_frame(ctx->inputs[0]); |
342 |
|
|
if (!av_audio_fifo_size(s->fifo[1])) |
343 |
|
|
ff_inlink_request_frame(ctx->inputs[1]); |
344 |
|
|
} |
345 |
|
|
return 0; |
346 |
|
|
} |
347 |
|
|
|
348 |
|
|
static int scquery_formats(AVFilterContext *ctx) |
349 |
|
|
{ |
350 |
|
|
AVFilterFormats *formats; |
351 |
|
|
AVFilterChannelLayouts *layouts = NULL; |
352 |
|
|
static const enum AVSampleFormat sample_fmts[] = { |
353 |
|
|
AV_SAMPLE_FMT_DBL, |
354 |
|
|
AV_SAMPLE_FMT_NONE |
355 |
|
|
}; |
356 |
|
|
int ret, i; |
357 |
|
|
|
358 |
|
|
if (!ctx->inputs[0]->incfg.channel_layouts || |
359 |
|
|
!ctx->inputs[0]->incfg.channel_layouts->nb_channel_layouts) { |
360 |
|
|
av_log(ctx, AV_LOG_WARNING, |
361 |
|
|
"No channel layout for input 1\n"); |
362 |
|
|
return AVERROR(EAGAIN); |
363 |
|
|
} |
364 |
|
|
|
365 |
|
|
if ((ret = ff_add_channel_layout(&layouts, ctx->inputs[0]->incfg.channel_layouts->channel_layouts[0])) < 0 || |
366 |
|
|
(ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->incfg.channel_layouts)) < 0) |
367 |
|
|
return ret; |
368 |
|
|
|
369 |
|
|
for (i = 0; i < 2; i++) { |
370 |
|
|
layouts = ff_all_channel_counts(); |
371 |
|
|
if ((ret = ff_channel_layouts_ref(layouts, &ctx->inputs[i]->outcfg.channel_layouts)) < 0) |
372 |
|
|
return ret; |
373 |
|
|
} |
374 |
|
|
|
375 |
|
|
formats = ff_make_format_list(sample_fmts); |
376 |
|
|
if ((ret = ff_set_common_formats(ctx, formats)) < 0) |
377 |
|
|
return ret; |
378 |
|
|
|
379 |
|
|
formats = ff_all_samplerates(); |
380 |
|
|
return ff_set_common_samplerates(ctx, formats); |
381 |
|
|
} |
382 |
|
|
|
383 |
|
|
static int scconfig_output(AVFilterLink *outlink) |
384 |
|
|
{ |
385 |
|
|
AVFilterContext *ctx = outlink->src; |
386 |
|
|
AudioGateContext *s = ctx->priv; |
387 |
|
|
|
388 |
|
|
if (ctx->inputs[0]->sample_rate != ctx->inputs[1]->sample_rate) { |
389 |
|
|
av_log(ctx, AV_LOG_ERROR, |
390 |
|
|
"Inputs must have the same sample rate " |
391 |
|
|
"%d for in0 vs %d for in1\n", |
392 |
|
|
ctx->inputs[0]->sample_rate, ctx->inputs[1]->sample_rate); |
393 |
|
|
return AVERROR(EINVAL); |
394 |
|
|
} |
395 |
|
|
|
396 |
|
|
outlink->sample_rate = ctx->inputs[0]->sample_rate; |
397 |
|
|
outlink->time_base = ctx->inputs[0]->time_base; |
398 |
|
|
outlink->channel_layout = ctx->inputs[0]->channel_layout; |
399 |
|
|
outlink->channels = ctx->inputs[0]->channels; |
400 |
|
|
|
401 |
|
|
s->fifo[0] = av_audio_fifo_alloc(ctx->inputs[0]->format, ctx->inputs[0]->channels, 1024); |
402 |
|
|
s->fifo[1] = av_audio_fifo_alloc(ctx->inputs[1]->format, ctx->inputs[1]->channels, 1024); |
403 |
|
|
if (!s->fifo[0] || !s->fifo[1]) |
404 |
|
|
return AVERROR(ENOMEM); |
405 |
|
|
|
406 |
|
|
|
407 |
|
|
agate_config_input(ctx->inputs[0]); |
408 |
|
|
|
409 |
|
|
return 0; |
410 |
|
|
} |
411 |
|
|
|
412 |
|
|
static av_cold void uninit(AVFilterContext *ctx) |
413 |
|
|
{ |
414 |
|
|
AudioGateContext *s = ctx->priv; |
415 |
|
|
|
416 |
|
|
av_audio_fifo_free(s->fifo[0]); |
417 |
|
|
av_audio_fifo_free(s->fifo[1]); |
418 |
|
|
} |
419 |
|
|
|
420 |
|
|
static const AVFilterPad sidechaingate_inputs[] = { |
421 |
|
|
{ |
422 |
|
|
.name = "main", |
423 |
|
|
.type = AVMEDIA_TYPE_AUDIO, |
424 |
|
|
},{ |
425 |
|
|
.name = "sidechain", |
426 |
|
|
.type = AVMEDIA_TYPE_AUDIO, |
427 |
|
|
}, |
428 |
|
|
{ NULL } |
429 |
|
|
}; |
430 |
|
|
|
431 |
|
|
static const AVFilterPad sidechaingate_outputs[] = { |
432 |
|
|
{ |
433 |
|
|
.name = "default", |
434 |
|
|
.type = AVMEDIA_TYPE_AUDIO, |
435 |
|
|
.config_props = scconfig_output, |
436 |
|
|
}, |
437 |
|
|
{ NULL } |
438 |
|
|
}; |
439 |
|
|
|
440 |
|
|
AVFilter ff_af_sidechaingate = { |
441 |
|
|
.name = "sidechaingate", |
442 |
|
|
.description = NULL_IF_CONFIG_SMALL("Audio sidechain gate."), |
443 |
|
|
.priv_size = sizeof(AudioGateContext), |
444 |
|
|
.priv_class = &sidechaingate_class, |
445 |
|
|
.query_formats = scquery_formats, |
446 |
|
|
.activate = activate, |
447 |
|
|
.uninit = uninit, |
448 |
|
|
.inputs = sidechaingate_inputs, |
449 |
|
|
.outputs = sidechaingate_outputs, |
450 |
|
|
.process_command = ff_filter_process_command, |
451 |
|
|
.flags = AVFILTER_FLAG_SUPPORT_TIMELINE_GENERIC, |
452 |
|
|
}; |
453 |
|
|
#endif /* CONFIG_SIDECHAINGATE_FILTER */ |