mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
450 lines
15 KiB
C
450 lines
15 KiB
C
/*
|
|
* Copyright (C) 2001-2010 Krzysztof Foltman, Markus Schmidt, Thor Harald Johansen, Damien Zammit
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* Audio (Sidechain) Gate filter
|
|
*/
|
|
|
|
#include "libavutil/audio_fifo.h"
|
|
#include "libavutil/avassert.h"
|
|
#include "libavutil/channel_layout.h"
|
|
#include "libavutil/opt.h"
|
|
#include "avfilter.h"
|
|
#include "audio.h"
|
|
#include "filters.h"
|
|
#include "formats.h"
|
|
#include "hermite.h"
|
|
|
|
typedef struct AudioGateContext {
|
|
const AVClass *class;
|
|
|
|
double level_in;
|
|
double level_sc;
|
|
double attack;
|
|
double release;
|
|
double threshold;
|
|
double ratio;
|
|
double knee;
|
|
double makeup;
|
|
double range;
|
|
int link;
|
|
int detection;
|
|
int mode;
|
|
|
|
double thres;
|
|
double knee_start;
|
|
double knee_stop;
|
|
double lin_knee_start;
|
|
double lin_knee_stop;
|
|
double lin_slope;
|
|
double attack_coeff;
|
|
double release_coeff;
|
|
|
|
AVAudioFifo *fifo[2];
|
|
int64_t pts;
|
|
} AudioGateContext;
|
|
|
|
#define OFFSET(x) offsetof(AudioGateContext, x)
|
|
#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
|
|
|
|
static const AVOption options[] = {
|
|
{ "level_in", "set input level", OFFSET(level_in), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A },
|
|
{ "mode", "set mode", OFFSET(mode), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, A, "mode" },
|
|
{ "downward",0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A, "mode" },
|
|
{ "upward", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A, "mode" },
|
|
{ "range", "set max gain reduction", OFFSET(range), AV_OPT_TYPE_DOUBLE, {.dbl=0.06125}, 0, 1, A },
|
|
{ "threshold", "set threshold", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0.125}, 0, 1, A },
|
|
{ "ratio", "set ratio", OFFSET(ratio), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 1, 9000, A },
|
|
{ "attack", "set attack", OFFSET(attack), AV_OPT_TYPE_DOUBLE, {.dbl=20}, 0.01, 9000, A },
|
|
{ "release", "set release", OFFSET(release), AV_OPT_TYPE_DOUBLE, {.dbl=250}, 0.01, 9000, A },
|
|
{ "makeup", "set makeup gain", OFFSET(makeup), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 1, 64, A },
|
|
{ "knee", "set knee", OFFSET(knee), AV_OPT_TYPE_DOUBLE, {.dbl=2.828427125}, 1, 8, A },
|
|
{ "detection", "set detection", OFFSET(detection), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, A, "detection" },
|
|
{ "peak", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A, "detection" },
|
|
{ "rms", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A, "detection" },
|
|
{ "link", "set link", OFFSET(link), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, A, "link" },
|
|
{ "average", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A, "link" },
|
|
{ "maximum", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A, "link" },
|
|
{ "level_sc", "set sidechain gain", OFFSET(level_sc), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A },
|
|
{ NULL }
|
|
};
|
|
|
|
static int agate_config_input(AVFilterLink *inlink)
|
|
{
|
|
AVFilterContext *ctx = inlink->dst;
|
|
AudioGateContext *s = ctx->priv;
|
|
double lin_threshold = s->threshold;
|
|
double lin_knee_sqrt = sqrt(s->knee);
|
|
|
|
if (s->detection)
|
|
lin_threshold *= lin_threshold;
|
|
|
|
s->attack_coeff = FFMIN(1., 1. / (s->attack * inlink->sample_rate / 4000.));
|
|
s->release_coeff = FFMIN(1., 1. / (s->release * inlink->sample_rate / 4000.));
|
|
s->lin_knee_stop = lin_threshold * lin_knee_sqrt;
|
|
s->lin_knee_start = lin_threshold / lin_knee_sqrt;
|
|
s->thres = log(lin_threshold);
|
|
s->knee_start = log(s->lin_knee_start);
|
|
s->knee_stop = log(s->lin_knee_stop);
|
|
|
|
return 0;
|
|
}
|
|
|
|
// A fake infinity value (because real infinity may break some hosts)
|
|
#define FAKE_INFINITY (65536.0 * 65536.0)
|
|
|
|
// Check for infinity (with appropriate-ish tolerance)
|
|
#define IS_FAKE_INFINITY(value) (fabs(value-FAKE_INFINITY) < 1.0)
|
|
|
|
static double output_gain(double lin_slope, double ratio, double thres,
|
|
double knee, double knee_start, double knee_stop,
|
|
double range, int mode)
|
|
{
|
|
double slope = log(lin_slope);
|
|
double tratio = ratio;
|
|
double gain = 0.;
|
|
double delta = 0.;
|
|
|
|
if (IS_FAKE_INFINITY(ratio))
|
|
tratio = 1000.;
|
|
gain = (slope - thres) * tratio + thres;
|
|
delta = tratio;
|
|
|
|
if (mode) {
|
|
if (knee > 1. && slope < knee_stop)
|
|
gain = hermite_interpolation(slope, knee_stop, knee_start, ((knee_stop - thres) * tratio + thres), knee_start, delta, 1.);
|
|
} else {
|
|
if (knee > 1. && slope > knee_start)
|
|
gain = hermite_interpolation(slope, knee_start, knee_stop, ((knee_start - thres) * tratio + thres), knee_stop, delta, 1.);
|
|
}
|
|
return FFMAX(range, exp(gain - slope));
|
|
}
|
|
|
|
static void gate(AudioGateContext *s,
|
|
const double *src, double *dst, const double *scsrc,
|
|
int nb_samples, double level_in, double level_sc,
|
|
AVFilterLink *inlink, AVFilterLink *sclink)
|
|
{
|
|
const double makeup = s->makeup;
|
|
const double attack_coeff = s->attack_coeff;
|
|
const double release_coeff = s->release_coeff;
|
|
int n, c;
|
|
|
|
for (n = 0; n < nb_samples; n++, src += inlink->channels, dst += inlink->channels, scsrc += sclink->channels) {
|
|
double abs_sample = fabs(scsrc[0] * level_sc), gain = 1.0;
|
|
int detected;
|
|
|
|
if (s->link == 1) {
|
|
for (c = 1; c < sclink->channels; c++)
|
|
abs_sample = FFMAX(fabs(scsrc[c] * level_sc), abs_sample);
|
|
} else {
|
|
for (c = 1; c < sclink->channels; c++)
|
|
abs_sample += fabs(scsrc[c] * level_sc);
|
|
|
|
abs_sample /= sclink->channels;
|
|
}
|
|
|
|
if (s->detection)
|
|
abs_sample *= abs_sample;
|
|
|
|
s->lin_slope += (abs_sample - s->lin_slope) * (abs_sample > s->lin_slope ? attack_coeff : release_coeff);
|
|
|
|
if (s->mode)
|
|
detected = s->lin_slope > s->lin_knee_start;
|
|
else
|
|
detected = s->lin_slope < s->lin_knee_stop;
|
|
|
|
if (s->lin_slope > 0.0 && detected)
|
|
gain = output_gain(s->lin_slope, s->ratio, s->thres,
|
|
s->knee, s->knee_start, s->knee_stop,
|
|
s->range, s->mode);
|
|
|
|
for (c = 0; c < inlink->channels; c++)
|
|
dst[c] = src[c] * level_in * gain * makeup;
|
|
}
|
|
}
|
|
|
|
#if CONFIG_AGATE_FILTER
|
|
|
|
#define agate_options options
|
|
AVFILTER_DEFINE_CLASS(agate);
|
|
|
|
static int query_formats(AVFilterContext *ctx)
|
|
{
|
|
AVFilterFormats *formats = NULL;
|
|
AVFilterChannelLayouts *layouts;
|
|
int ret;
|
|
|
|
if ((ret = ff_add_format(&formats, AV_SAMPLE_FMT_DBL)) < 0)
|
|
return ret;
|
|
ret = ff_set_common_formats(ctx, formats);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
layouts = ff_all_channel_counts();
|
|
if (!layouts)
|
|
return AVERROR(ENOMEM);
|
|
ret = ff_set_common_channel_layouts(ctx, layouts);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
formats = ff_all_samplerates();
|
|
if (!formats)
|
|
return AVERROR(ENOMEM);
|
|
|
|
return ff_set_common_samplerates(ctx, formats);
|
|
}
|
|
|
|
static int filter_frame(AVFilterLink *inlink, AVFrame *in)
|
|
{
|
|
const double *src = (const double *)in->data[0];
|
|
AVFilterContext *ctx = inlink->dst;
|
|
AVFilterLink *outlink = ctx->outputs[0];
|
|
AudioGateContext *s = ctx->priv;
|
|
AVFrame *out;
|
|
double *dst;
|
|
|
|
if (av_frame_is_writable(in)) {
|
|
out = in;
|
|
} else {
|
|
out = ff_get_audio_buffer(outlink, in->nb_samples);
|
|
if (!out) {
|
|
av_frame_free(&in);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
av_frame_copy_props(out, in);
|
|
}
|
|
dst = (double *)out->data[0];
|
|
|
|
gate(s, src, dst, src, in->nb_samples,
|
|
s->level_in, s->level_in, inlink, inlink);
|
|
|
|
if (out != in)
|
|
av_frame_free(&in);
|
|
return ff_filter_frame(outlink, out);
|
|
}
|
|
|
|
static const AVFilterPad inputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.filter_frame = filter_frame,
|
|
.config_props = agate_config_input,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter ff_af_agate = {
|
|
.name = "agate",
|
|
.description = NULL_IF_CONFIG_SMALL("Audio gate."),
|
|
.query_formats = query_formats,
|
|
.priv_size = sizeof(AudioGateContext),
|
|
.priv_class = &agate_class,
|
|
.inputs = inputs,
|
|
.outputs = outputs,
|
|
};
|
|
|
|
#endif /* CONFIG_AGATE_FILTER */
|
|
|
|
#if CONFIG_SIDECHAINGATE_FILTER
|
|
|
|
#define sidechaingate_options options
|
|
AVFILTER_DEFINE_CLASS(sidechaingate);
|
|
|
|
static int activate(AVFilterContext *ctx)
|
|
{
|
|
AudioGateContext *s = ctx->priv;
|
|
AVFrame *out = NULL, *in[2] = { NULL };
|
|
int ret, i, nb_samples;
|
|
double *dst;
|
|
|
|
FF_FILTER_FORWARD_STATUS_BACK_ALL(ctx->outputs[0], ctx);
|
|
if ((ret = ff_inlink_consume_frame(ctx->inputs[0], &in[0])) > 0) {
|
|
av_audio_fifo_write(s->fifo[0], (void **)in[0]->extended_data,
|
|
in[0]->nb_samples);
|
|
av_frame_free(&in[0]);
|
|
}
|
|
if (ret < 0)
|
|
return ret;
|
|
if ((ret = ff_inlink_consume_frame(ctx->inputs[1], &in[1])) > 0) {
|
|
av_audio_fifo_write(s->fifo[1], (void **)in[1]->extended_data,
|
|
in[1]->nb_samples);
|
|
av_frame_free(&in[1]);
|
|
}
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
nb_samples = FFMIN(av_audio_fifo_size(s->fifo[0]), av_audio_fifo_size(s->fifo[1]));
|
|
if (nb_samples) {
|
|
out = ff_get_audio_buffer(ctx->outputs[0], nb_samples);
|
|
if (!out)
|
|
return AVERROR(ENOMEM);
|
|
for (i = 0; i < 2; i++) {
|
|
in[i] = ff_get_audio_buffer(ctx->inputs[i], nb_samples);
|
|
if (!in[i]) {
|
|
av_frame_free(&in[0]);
|
|
av_frame_free(&in[1]);
|
|
av_frame_free(&out);
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
av_audio_fifo_read(s->fifo[i], (void **)in[i]->data, nb_samples);
|
|
}
|
|
|
|
dst = (double *)out->data[0];
|
|
out->pts = s->pts;
|
|
s->pts += av_rescale_q(nb_samples, (AVRational){1, ctx->outputs[0]->sample_rate}, ctx->outputs[0]->time_base);
|
|
|
|
gate(s, (double *)in[0]->data[0], dst,
|
|
(double *)in[1]->data[0], nb_samples,
|
|
s->level_in, s->level_sc,
|
|
ctx->inputs[0], ctx->inputs[1]);
|
|
|
|
av_frame_free(&in[0]);
|
|
av_frame_free(&in[1]);
|
|
|
|
ret = ff_filter_frame(ctx->outputs[0], out);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
FF_FILTER_FORWARD_STATUS(ctx->inputs[0], ctx->outputs[0]);
|
|
FF_FILTER_FORWARD_STATUS(ctx->inputs[1], ctx->outputs[0]);
|
|
if (ff_outlink_frame_wanted(ctx->outputs[0])) {
|
|
if (!av_audio_fifo_size(s->fifo[0]))
|
|
ff_inlink_request_frame(ctx->inputs[0]);
|
|
if (!av_audio_fifo_size(s->fifo[1]))
|
|
ff_inlink_request_frame(ctx->inputs[1]);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int scquery_formats(AVFilterContext *ctx)
|
|
{
|
|
AVFilterFormats *formats;
|
|
AVFilterChannelLayouts *layouts = NULL;
|
|
static const enum AVSampleFormat sample_fmts[] = {
|
|
AV_SAMPLE_FMT_DBL,
|
|
AV_SAMPLE_FMT_NONE
|
|
};
|
|
int ret, i;
|
|
|
|
if (!ctx->inputs[0]->in_channel_layouts ||
|
|
!ctx->inputs[0]->in_channel_layouts->nb_channel_layouts) {
|
|
av_log(ctx, AV_LOG_WARNING,
|
|
"No channel layout for input 1\n");
|
|
return AVERROR(EAGAIN);
|
|
}
|
|
|
|
if ((ret = ff_add_channel_layout(&layouts, ctx->inputs[0]->in_channel_layouts->channel_layouts[0])) < 0 ||
|
|
(ret = ff_channel_layouts_ref(layouts, &ctx->outputs[0]->in_channel_layouts)) < 0)
|
|
return ret;
|
|
|
|
for (i = 0; i < 2; i++) {
|
|
layouts = ff_all_channel_counts();
|
|
if ((ret = ff_channel_layouts_ref(layouts, &ctx->inputs[i]->out_channel_layouts)) < 0)
|
|
return ret;
|
|
}
|
|
|
|
formats = ff_make_format_list(sample_fmts);
|
|
if ((ret = ff_set_common_formats(ctx, formats)) < 0)
|
|
return ret;
|
|
|
|
formats = ff_all_samplerates();
|
|
return ff_set_common_samplerates(ctx, formats);
|
|
}
|
|
|
|
static int scconfig_output(AVFilterLink *outlink)
|
|
{
|
|
AVFilterContext *ctx = outlink->src;
|
|
AudioGateContext *s = ctx->priv;
|
|
|
|
if (ctx->inputs[0]->sample_rate != ctx->inputs[1]->sample_rate) {
|
|
av_log(ctx, AV_LOG_ERROR,
|
|
"Inputs must have the same sample rate "
|
|
"%d for in0 vs %d for in1\n",
|
|
ctx->inputs[0]->sample_rate, ctx->inputs[1]->sample_rate);
|
|
return AVERROR(EINVAL);
|
|
}
|
|
|
|
outlink->sample_rate = ctx->inputs[0]->sample_rate;
|
|
outlink->time_base = ctx->inputs[0]->time_base;
|
|
outlink->channel_layout = ctx->inputs[0]->channel_layout;
|
|
outlink->channels = ctx->inputs[0]->channels;
|
|
|
|
s->fifo[0] = av_audio_fifo_alloc(ctx->inputs[0]->format, ctx->inputs[0]->channels, 1024);
|
|
s->fifo[1] = av_audio_fifo_alloc(ctx->inputs[1]->format, ctx->inputs[1]->channels, 1024);
|
|
if (!s->fifo[0] || !s->fifo[1])
|
|
return AVERROR(ENOMEM);
|
|
|
|
|
|
agate_config_input(ctx->inputs[0]);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static av_cold void uninit(AVFilterContext *ctx)
|
|
{
|
|
AudioGateContext *s = ctx->priv;
|
|
|
|
av_audio_fifo_free(s->fifo[0]);
|
|
av_audio_fifo_free(s->fifo[1]);
|
|
}
|
|
|
|
static const AVFilterPad sidechaingate_inputs[] = {
|
|
{
|
|
.name = "main",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
},{
|
|
.name = "sidechain",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
static const AVFilterPad sidechaingate_outputs[] = {
|
|
{
|
|
.name = "default",
|
|
.type = AVMEDIA_TYPE_AUDIO,
|
|
.config_props = scconfig_output,
|
|
},
|
|
{ NULL }
|
|
};
|
|
|
|
AVFilter ff_af_sidechaingate = {
|
|
.name = "sidechaingate",
|
|
.description = NULL_IF_CONFIG_SMALL("Audio sidechain gate."),
|
|
.priv_size = sizeof(AudioGateContext),
|
|
.priv_class = &sidechaingate_class,
|
|
.query_formats = scquery_formats,
|
|
.activate = activate,
|
|
.uninit = uninit,
|
|
.inputs = sidechaingate_inputs,
|
|
.outputs = sidechaingate_outputs,
|
|
};
|
|
#endif /* CONFIG_SIDECHAINGATE_FILTER */
|