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-rw-r--r--libavfilter/af_agate.c440
1 files changed, 440 insertions, 0 deletions
diff --git a/libavfilter/af_agate.c b/libavfilter/af_agate.c
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+++ b/libavfilter/af_agate.c
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+/*
+ * 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 "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;
+
+ double thres;
+ double knee_start;
+ double lin_knee_stop;
+ double 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 },
+ { "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);
+ double lin_knee_start;
+
+ 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;
+ lin_knee_start = lin_threshold / lin_knee_sqrt;
+ s->thres = log(lin_threshold);
+ s->knee_start = log(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 lin_knee_stop, double range)
+{
+ if (lin_slope < lin_knee_stop) {
+ 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 (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));
+ }
+
+ return 1.;
+}
+
+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;
+
+ 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->lin_slope > 0.0)
+ gain = output_gain(s->lin_slope, s->ratio, s->thres,
+ s->knee, s->knee_start, s->knee_stop,
+ s->lin_knee_stop, s->range);
+
+ 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(inlink, 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 scfilter_frame(AVFilterLink *link, AVFrame *frame)
+{
+ AVFilterContext *ctx = link->dst;
+ AudioGateContext *s = ctx->priv;
+ AVFilterLink *outlink = ctx->outputs[0];
+ AVFrame *out, *in[2] = { NULL };
+ double *dst;
+ int nb_samples;
+ int i;
+
+ for (i = 0; i < 2; i++)
+ if (link == ctx->inputs[i])
+ break;
+ av_assert0(i < 2);
+ av_audio_fifo_write(s->fifo[i], (void **)frame->extended_data,
+ frame->nb_samples);
+ av_frame_free(&frame);
+
+ nb_samples = FFMIN(av_audio_fifo_size(s->fifo[0]), av_audio_fifo_size(s->fifo[1]));
+ if (!nb_samples)
+ return 0;
+
+ out = ff_get_audio_buffer(outlink, 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 += nb_samples;
+
+ 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]);
+
+ return ff_filter_frame(outlink, out);
+}
+
+static int screquest_frame(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ AudioGateContext *s = ctx->priv;
+ int i;
+
+ /* get a frame on each input */
+ for (i = 0; i < 2; i++) {
+ AVFilterLink *inlink = ctx->inputs[i];
+ if (!av_audio_fifo_size(s->fifo[i]))
+ return ff_request_frame(inlink);
+ }
+
+ 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,
+ .filter_frame = scfilter_frame,
+ },{
+ .name = "sidechain",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .filter_frame = scfilter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad sidechaingate_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .config_props = scconfig_output,
+ .request_frame = screquest_frame,
+ },
+ { 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,
+ .uninit = uninit,
+ .inputs = sidechaingate_inputs,
+ .outputs = sidechaingate_outputs,
+};
+#endif /* CONFIG_SIDECHAINGATE_FILTER */
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