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437 lines
15 KiB
437 lines
15 KiB
/* |
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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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* Audio (Sidechain) Compressor filter |
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*/ |
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#include "config_components.h" |
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#include "libavutil/audio_fifo.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 "filters.h" |
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#include "formats.h" |
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#include "hermite.h" |
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typedef struct SidechainCompressContext { |
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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, 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 lin_knee_stop; |
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double adj_knee_start; |
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double adj_knee_stop; |
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double compressed_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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int mode; |
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AVAudioFifo *fifo[2]; |
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int64_t pts; |
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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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#define R AV_OPT_FLAG_RUNTIME_PARAM |
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static const AVOption options[] = { |
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{ "level_in", "set input gain", OFFSET(level_in), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A|F|R }, |
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{ "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, A|F|R, .unit = "mode" }, |
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{ "downward",0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A|F|R, .unit = "mode" }, |
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{ "upward", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A|F|R, .unit = "mode" }, |
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{ "threshold", "set threshold", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0.125}, 0.000976563, 1, A|F|R }, |
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{ "ratio", "set ratio", OFFSET(ratio), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 1, 20, A|F|R }, |
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{ "attack", "set attack", OFFSET(attack), AV_OPT_TYPE_DOUBLE, {.dbl=20}, 0.01, 2000, A|F|R }, |
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{ "release", "set release", OFFSET(release), AV_OPT_TYPE_DOUBLE, {.dbl=250}, 0.01, 9000, A|F|R }, |
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{ "makeup", "set make up gain", OFFSET(makeup), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 1, 64, A|F|R }, |
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{ "knee", "set knee", OFFSET(knee), AV_OPT_TYPE_DOUBLE, {.dbl=2.82843}, 1, 8, A|F|R }, |
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{ "link", "set link type", OFFSET(link), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, A|F|R, .unit = "link" }, |
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{ "average", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A|F|R, .unit = "link" }, |
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{ "maximum", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A|F|R, .unit = "link" }, |
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{ "detection", "set detection", OFFSET(detection), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, A|F|R, .unit = "detection" }, |
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{ "peak", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A|F|R, .unit = "detection" }, |
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{ "rms", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A|F|R, .unit = "detection" }, |
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{ "level_sc", "set sidechain gain", OFFSET(level_sc), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A|F|R }, |
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{ "mix", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, A|F|R }, |
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{ NULL } |
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}; |
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AVFILTER_DEFINE_CLASS_EXT(sidechaincompress_acompressor, |
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"acompressor/sidechaincompress", |
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options); |
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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_start, |
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double compressed_knee_stop, |
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int detection, int mode) |
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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 (mode) { |
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if (knee > 1.0 && slope > knee_start) |
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gain = hermite_interpolation(slope, knee_stop, knee_start, |
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knee_stop, compressed_knee_start, |
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1.0, delta); |
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} else { |
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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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} |
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return exp(gain - slope); |
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} |
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static int compressor_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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s->thres = log(s->threshold); |
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s->lin_knee_start = s->threshold / sqrt(s->knee); |
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s->lin_knee_stop = s->threshold * sqrt(s->knee); |
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s->adj_knee_start = s->lin_knee_start * s->lin_knee_start; |
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s->adj_knee_stop = s->lin_knee_stop * s->lin_knee_stop; |
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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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s->compressed_knee_start = (s->knee_start - s->thres) / s->ratio + s->thres; |
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s->compressed_knee_stop = (s->knee_stop - s->thres) / s->ratio + s->thres; |
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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 void compressor(SidechainCompressContext *s, |
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const double *src, double *dst, const double *scsrc, int nb_samples, |
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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 mix = s->mix; |
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int i, c; |
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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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double detector; |
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int detected; |
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abs_sample = fabs(scsrc[0] * level_sc); |
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if (s->link == 1) { |
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for (c = 1; c < sclink->ch_layout.nb_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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for (c = 1; c < sclink->ch_layout.nb_channels; c++) |
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abs_sample += fabs(scsrc[c] * level_sc); |
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abs_sample /= sclink->ch_layout.nb_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->mode) { |
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detector = (s->detection ? s->adj_knee_stop : s->lin_knee_stop); |
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detected = s->lin_slope < detector; |
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} else { |
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detector = (s->detection ? s->adj_knee_start : s->lin_knee_start); |
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detected = s->lin_slope > detector; |
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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, s->knee, |
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s->knee_start, s->knee_stop, |
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s->compressed_knee_start, |
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s->compressed_knee_stop, |
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s->detection, s->mode); |
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for (c = 0; c < inlink->ch_layout.nb_channels; c++) |
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dst[c] = src[c] * level_in * (gain * makeup * mix + (1. - mix)); |
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src += inlink->ch_layout.nb_channels; |
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dst += inlink->ch_layout.nb_channels; |
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scsrc += sclink->ch_layout.nb_channels; |
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} |
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} |
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static int process_command(AVFilterContext *ctx, const char *cmd, const char *args, |
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char *res, int res_len, int flags) |
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{ |
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int ret; |
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ret = ff_filter_process_command(ctx, cmd, args, res, res_len, flags); |
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if (ret < 0) |
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return ret; |
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compressor_config_output(ctx->outputs[0]); |
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return 0; |
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} |
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#if CONFIG_SIDECHAINCOMPRESS_FILTER |
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static int activate(AVFilterContext *ctx) |
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{ |
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SidechainCompressContext *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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} |
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if (ret < 0) |
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return ret; |
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if ((ret = ff_inlink_consume_frame(ctx->inputs[1], &in[1])) > 0) { |
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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]); |
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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])); |
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if (nb_samples) { |
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out = ff_get_audio_buffer(ctx->outputs[0], nb_samples); |
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if (!out) |
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return AVERROR(ENOMEM); |
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for (i = 0; i < 2; i++) { |
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in[i] = ff_get_audio_buffer(ctx->inputs[i], nb_samples); |
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if (!in[i]) { |
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av_frame_free(&in[0]); |
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av_frame_free(&in[1]); |
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av_frame_free(&out); |
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return AVERROR(ENOMEM); |
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} |
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av_audio_fifo_read(s->fifo[i], (void **)in[i]->data, nb_samples); |
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} |
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dst = (double *)out->data[0]; |
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out->pts = s->pts; |
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s->pts += av_rescale_q(nb_samples, (AVRational){1, ctx->outputs[0]->sample_rate}, ctx->outputs[0]->time_base); |
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compressor(s, (double *)in[0]->data[0], dst, |
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(double *)in[1]->data[0], nb_samples, |
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s->level_in, s->level_sc, |
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ctx->inputs[0], ctx->inputs[1]); |
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av_frame_free(&in[0]); |
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av_frame_free(&in[1]); |
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ret = ff_filter_frame(ctx->outputs[0], out); |
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if (ret < 0) |
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return ret; |
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} |
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FF_FILTER_FORWARD_STATUS(ctx->inputs[0], ctx->outputs[0]); |
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FF_FILTER_FORWARD_STATUS(ctx->inputs[1], ctx->outputs[0]); |
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if (ff_outlink_frame_wanted(ctx->outputs[0])) { |
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if (!av_audio_fifo_size(s->fifo[0])) |
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ff_inlink_request_frame(ctx->inputs[0]); |
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if (!av_audio_fifo_size(s->fifo[1])) |
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ff_inlink_request_frame(ctx->inputs[1]); |
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} |
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return 0; |
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} |
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static int query_formats(const AVFilterContext *ctx, |
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AVFilterFormatsConfig **cfg_in, |
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AVFilterFormatsConfig **cfg_out) |
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{ |
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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; |
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/* Generic code will link the channel properties of the main input and the output; |
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* it won't touch the second input as its channel_layouts is already set. */ |
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ret = ff_channel_layouts_ref(ff_all_channel_counts(), |
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&cfg_in[1]->channel_layouts); |
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if (ret < 0) |
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return ret; |
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if ((ret = ff_set_common_formats_from_list2(ctx, cfg_in, cfg_out, sample_fmts)) < 0) |
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return ret; |
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return 0; |
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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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outlink->time_base = ctx->inputs[0]->time_base; |
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s->fifo[0] = av_audio_fifo_alloc(ctx->inputs[0]->format, ctx->inputs[0]->ch_layout.nb_channels, 1024); |
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s->fifo[1] = av_audio_fifo_alloc(ctx->inputs[1]->format, ctx->inputs[1]->ch_layout.nb_channels, 1024); |
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if (!s->fifo[0] || !s->fifo[1]) |
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return AVERROR(ENOMEM); |
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compressor_config_output(outlink); |
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return 0; |
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} |
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static av_cold void uninit(AVFilterContext *ctx) |
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{ |
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SidechainCompressContext *s = ctx->priv; |
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av_audio_fifo_free(s->fifo[0]); |
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av_audio_fifo_free(s->fifo[1]); |
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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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},{ |
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.name = "sidechain", |
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.type = AVMEDIA_TYPE_AUDIO, |
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}, |
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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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}, |
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}; |
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const 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_class = &sidechaincompress_acompressor_class, |
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.priv_size = sizeof(SidechainCompressContext), |
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.activate = activate, |
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.uninit = uninit, |
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FILTER_INPUTS(sidechaincompress_inputs), |
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FILTER_OUTPUTS(sidechaincompress_outputs), |
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FILTER_QUERY_FUNC2(query_formats), |
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.process_command = process_command, |
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}; |
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#endif /* CONFIG_SIDECHAINCOMPRESS_FILTER */ |
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#if CONFIG_ACOMPRESSOR_FILTER |
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static int acompressor_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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SidechainCompressContext *s = ctx->priv; |
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AVFilterLink *outlink = ctx->outputs[0]; |
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AVFrame *out; |
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double *dst; |
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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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compressor(s, src, dst, src, in->nb_samples, |
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s->level_in, s->level_in, |
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inlink, inlink); |
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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 acompressor_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 = acompressor_filter_frame, |
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}, |
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}; |
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static const AVFilterPad acompressor_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 = compressor_config_output, |
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}, |
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}; |
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const AVFilter ff_af_acompressor = { |
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.name = "acompressor", |
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.description = NULL_IF_CONFIG_SMALL("Audio compressor."), |
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.priv_class = &sidechaincompress_acompressor_class, |
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.priv_size = sizeof(SidechainCompressContext), |
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FILTER_INPUTS(acompressor_inputs), |
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FILTER_OUTPUTS(acompressor_outputs), |
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FILTER_SINGLE_SAMPLEFMT(AV_SAMPLE_FMT_DBL), |
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.process_command = process_command, |
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}; |
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#endif /* CONFIG_ACOMPRESSOR_FILTER */
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