Signed-off-by: Paul B Mahol <onemda@gmail.com>pull/140/head
Paul B Mahol
10 years ago
parent
af08d8bfbb
commit
c1fa846d0c
6 changed files with 404 additions and 1 deletions
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/*
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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 "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 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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{ 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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static inline float hermite_interpolation(float x, float x0, float x1, |
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float p0, float p1, |
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float m0, float m1) |
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{ |
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float width = x1 - x0; |
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float t = (x - x0) / width; |
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float t2, t3; |
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float ct0, ct1, ct2, ct3; |
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m0 *= width; |
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m1 *= width; |
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t2 = t*t; |
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t3 = t2*t; |
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ct0 = p0; |
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ct1 = m0; |
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ct2 = -3 * p0 - 2 * m0 + 3 * p1 - m1; |
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ct3 = 2 * p0 + m0 - 2 * p1 + m1; |
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return ct3 * t3 + ct2 * t2 + ct1 * t + ct0; |
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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 *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(!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 = FFABS(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(FFABS(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 += FFABS(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; |
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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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ff_add_channel_layout(&layouts, ctx->inputs[0]->in_channel_layouts->channel_layouts[0]); |
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if (!layouts) |
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return AVERROR(ENOMEM); |
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ff_channel_layouts_ref(layouts, &ctx->outputs[0]->in_channel_layouts); |
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for (i = 0; i < 2; i++) { |
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layouts = ff_all_channel_layouts(); |
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if (!layouts) |
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return AVERROR(ENOMEM); |
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ff_channel_layouts_ref(layouts, &ctx->inputs[i]->out_channel_layouts); |
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} |
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formats = ff_make_format_list(sample_fmts); |
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if (!formats) |
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return AVERROR(ENOMEM); |
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ret = ff_set_common_formats(ctx, formats); |
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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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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 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.f, 1.f / (s->attack * outlink->sample_rate / 4000.f)); |
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s->release_coeff = FFMIN(1.f, 1.f / (s->release * outlink->sample_rate / 4000.f)); |
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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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