/**
* @file
- * Sidechain compressor filter
+ * Audio (Sidechain) Compressor filter
*/
#include "libavutil/avassert.h"
typedef struct SidechainCompressContext {
const AVClass *class;
+ double level_in;
+ double level_sc;
double attack, attack_coeff;
double release, release_coeff;
double lin_slope;
double ratio;
double threshold;
double makeup;
+ double mix;
double thres;
double knee;
double knee_start;
double knee_stop;
double lin_knee_start;
+ double adj_knee_start;
double compressed_knee_stop;
int link;
int detection;
#define A AV_OPT_FLAG_AUDIO_PARAM
#define F AV_OPT_FLAG_FILTERING_PARAM
-static const AVOption sidechaincompress_options[] = {
- { "threshold", "set threshold", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0.125}, 0.000976563, 1, A|F },
- { "ratio", "set ratio", OFFSET(ratio), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 1, 20, A|F },
- { "attack", "set attack", OFFSET(attack), AV_OPT_TYPE_DOUBLE, {.dbl=20}, 0.01, 2000, A|F },
- { "release", "set release", OFFSET(release), AV_OPT_TYPE_DOUBLE, {.dbl=250}, 0.01, 9000, A|F },
- { "makeup", "set make up gain", OFFSET(makeup), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 1, 64, A|F },
- { "knee", "set knee", OFFSET(knee), AV_OPT_TYPE_DOUBLE, {.dbl=2.82843}, 1, 8, A|F },
- { "link", "set link type", OFFSET(link), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, A|F, "link" },
- { "average", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A|F, "link" },
- { "maximum", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A|F, "link" },
- { "detection", "set detection", OFFSET(detection), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, A|F, "detection" },
- { "peak", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A|F, "detection" },
- { "rms", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A|F, "detection" },
+static const AVOption options[] = {
+ { "level_in", "set input gain", OFFSET(level_in), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A|F },
+ { "threshold", "set threshold", OFFSET(threshold), AV_OPT_TYPE_DOUBLE, {.dbl=0.125}, 0.000976563, 1, A|F },
+ { "ratio", "set ratio", OFFSET(ratio), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 1, 20, A|F },
+ { "attack", "set attack", OFFSET(attack), AV_OPT_TYPE_DOUBLE, {.dbl=20}, 0.01, 2000, A|F },
+ { "release", "set release", OFFSET(release), AV_OPT_TYPE_DOUBLE, {.dbl=250}, 0.01, 9000, A|F },
+ { "makeup", "set make up gain", OFFSET(makeup), AV_OPT_TYPE_DOUBLE, {.dbl=2}, 1, 64, A|F },
+ { "knee", "set knee", OFFSET(knee), AV_OPT_TYPE_DOUBLE, {.dbl=2.82843}, 1, 8, A|F },
+ { "link", "set link type", OFFSET(link), AV_OPT_TYPE_INT, {.i64=0}, 0, 1, A|F, "link" },
+ { "average", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A|F, "link" },
+ { "maximum", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A|F, "link" },
+ { "detection", "set detection", OFFSET(detection), AV_OPT_TYPE_INT, {.i64=1}, 0, 1, A|F, "detection" },
+ { "peak", 0, 0, AV_OPT_TYPE_CONST, {.i64=0}, 0, 0, A|F, "detection" },
+ { "rms", 0, 0, AV_OPT_TYPE_CONST, {.i64=1}, 0, 0, A|F, "detection" },
+ { "level_sc", "set sidechain gain", OFFSET(level_sc), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0.015625, 64, A|F },
+ { "mix", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, A|F },
{ NULL }
};
+#define sidechaincompress_options options
AVFILTER_DEFINE_CLASS(sidechaincompress);
-static av_cold int init(AVFilterContext *ctx)
-{
- SidechainCompressContext *s = ctx->priv;
-
- s->thres = log(s->threshold);
- s->lin_knee_start = s->threshold / sqrt(s->knee);
- s->knee_start = log(s->lin_knee_start);
- s->knee_stop = log(s->threshold * sqrt(s->knee));
- s->compressed_knee_stop = (s->knee_stop - s->thres) / s->ratio + s->thres;
-
- return 0;
-}
-
// A fake infinity value (because real infinity may break some hosts)
#define FAKE_INFINITY (65536.0 * 65536.0)
return exp(gain - slope);
}
-static int filter_frame(AVFilterLink *link, AVFrame *frame)
+static int compressor_config_output(AVFilterLink *outlink)
{
- AVFilterContext *ctx = link->dst;
+ AVFilterContext *ctx = outlink->src;
SidechainCompressContext *s = ctx->priv;
- AVFilterLink *sclink = ctx->inputs[1];
- AVFilterLink *outlink = ctx->outputs[0];
- const double makeup = s->makeup;
- const double *scsrc;
- double *sample;
- int nb_samples;
- int ret, i, c;
- for (i = 0; i < 2; i++)
- if (link == ctx->inputs[i])
- break;
- av_assert0(i < 2 && !s->input_frame[i]);
- s->input_frame[i] = frame;
+ s->thres = log(s->threshold);
+ s->lin_knee_start = s->threshold / sqrt(s->knee);
+ s->adj_knee_start = s->lin_knee_start * s->lin_knee_start;
+ s->knee_start = log(s->lin_knee_start);
+ s->knee_stop = log(s->threshold * sqrt(s->knee));
+ s->compressed_knee_stop = (s->knee_stop - s->thres) / s->ratio + s->thres;
- if (!s->input_frame[0] || !s->input_frame[1])
- return 0;
+ s->attack_coeff = FFMIN(1., 1. / (s->attack * outlink->sample_rate / 4000.));
+ s->release_coeff = FFMIN(1., 1. / (s->release * outlink->sample_rate / 4000.));
- nb_samples = FFMIN(s->input_frame[0]->nb_samples,
- s->input_frame[1]->nb_samples);
+ return 0;
+}
- sample = (double *)s->input_frame[0]->data[0];
- scsrc = (const double *)s->input_frame[1]->data[0];
+static void compressor(SidechainCompressContext *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 mix = s->mix;
+ int i, c;
for (i = 0; i < nb_samples; i++) {
double abs_sample, gain = 1.0;
- abs_sample = fabs(scsrc[0]);
+ abs_sample = fabs(scsrc[0] * level_sc);
if (s->link == 1) {
for (c = 1; c < sclink->channels; c++)
- abs_sample = FFMAX(fabs(scsrc[c]), abs_sample);
+ abs_sample = FFMAX(fabs(scsrc[c] * level_sc), abs_sample);
} else {
for (c = 1; c < sclink->channels; c++)
- abs_sample += fabs(scsrc[c]);
+ abs_sample += fabs(scsrc[c] * level_sc);
abs_sample /= sclink->channels;
}
s->lin_slope += (abs_sample - s->lin_slope) * (abs_sample > s->lin_slope ? s->attack_coeff : s->release_coeff);
- if (s->lin_slope > 0.0 && s->lin_slope > s->lin_knee_start)
+ if (s->lin_slope > 0.0 && s->lin_slope > (s->detection ? s->adj_knee_start : s->lin_knee_start))
gain = output_gain(s->lin_slope, s->ratio, s->thres, s->knee,
s->knee_start, s->knee_stop,
s->compressed_knee_stop, s->detection);
- for (c = 0; c < outlink->channels; c++)
- sample[c] *= gain * makeup;
+ for (c = 0; c < inlink->channels; c++)
+ dst[c] = src[c] * level_in * (gain * makeup * mix + (1. - mix));
- sample += outlink->channels;
+ src += inlink->channels;
+ dst += inlink->channels;
scsrc += sclink->channels;
}
+}
+#if CONFIG_SIDECHAINCOMPRESS_FILTER
+static int filter_frame(AVFilterLink *link, AVFrame *frame)
+{
+ AVFilterContext *ctx = link->dst;
+ SidechainCompressContext *s = ctx->priv;
+ AVFilterLink *outlink = ctx->outputs[0];
+ const double *scsrc;
+ double *sample;
+ int nb_samples;
+ int ret, i;
+
+ for (i = 0; i < 2; i++)
+ if (link == ctx->inputs[i])
+ break;
+ av_assert0(i < 2 && !s->input_frame[i]);
+ s->input_frame[i] = frame;
+
+ if (!s->input_frame[0] || !s->input_frame[1])
+ return 0;
+
+ nb_samples = FFMIN(s->input_frame[0]->nb_samples,
+ s->input_frame[1]->nb_samples);
+
+ sample = (double *)s->input_frame[0]->data[0];
+ scsrc = (const double *)s->input_frame[1]->data[0];
+
+ compressor(s, sample, sample, scsrc, nb_samples,
+ s->level_in, s->level_sc,
+ ctx->inputs[0], ctx->inputs[1]);
ret = ff_filter_frame(outlink, s->input_frame[0]);
s->input_frame[0] = NULL;
static int config_output(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
- SidechainCompressContext *s = ctx->priv;
if (ctx->inputs[0]->sample_rate != ctx->inputs[1]->sample_rate) {
av_log(ctx, AV_LOG_ERROR,
outlink->channel_layout = ctx->inputs[0]->channel_layout;
outlink->channels = ctx->inputs[0]->channels;
- s->attack_coeff = FFMIN(1., 1. / (s->attack * outlink->sample_rate / 4000.));
- s->release_coeff = FFMIN(1., 1. / (s->release * outlink->sample_rate / 4000.));
+ compressor_config_output(outlink);
return 0;
}
.description = NULL_IF_CONFIG_SMALL("Sidechain compressor."),
.priv_size = sizeof(SidechainCompressContext),
.priv_class = &sidechaincompress_class,
- .init = init,
.query_formats = query_formats,
.inputs = sidechaincompress_inputs,
.outputs = sidechaincompress_outputs,
};
+#endif /* CONFIG_SIDECHAINCOMPRESS_FILTER */
+
+#if CONFIG_ACOMPRESSOR_FILTER
+static int acompressor_filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+ const double *src = (const double *)in->data[0];
+ AVFilterContext *ctx = inlink->dst;
+ SidechainCompressContext *s = ctx->priv;
+ AVFilterLink *outlink = ctx->outputs[0];
+ 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];
+
+ compressor(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 int acompressor_query_formats(AVFilterContext *ctx)
+{
+ AVFilterFormats *formats;
+ AVFilterChannelLayouts *layouts;
+ static const enum AVSampleFormat sample_fmts[] = {
+ AV_SAMPLE_FMT_DBL,
+ AV_SAMPLE_FMT_NONE
+ };
+ int 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_make_format_list(sample_fmts);
+ if (!formats)
+ return AVERROR(ENOMEM);
+ ret = ff_set_common_formats(ctx, formats);
+ if (ret < 0)
+ return ret;
+
+ formats = ff_all_samplerates();
+ if (!formats)
+ return AVERROR(ENOMEM);
+ return ff_set_common_samplerates(ctx, formats);
+}
+
+#define acompressor_options options
+AVFILTER_DEFINE_CLASS(acompressor);
+
+static const AVFilterPad acompressor_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .filter_frame = acompressor_filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad acompressor_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .config_props = compressor_config_output,
+ },
+ { NULL }
+};
+
+AVFilter ff_af_acompressor = {
+ .name = "acompressor",
+ .description = NULL_IF_CONFIG_SMALL("Audio compressor."),
+ .priv_size = sizeof(SidechainCompressContext),
+ .priv_class = &acompressor_class,
+ .query_formats = acompressor_query_formats,
+ .inputs = acompressor_inputs,
+ .outputs = acompressor_outputs,
+};
+#endif /* CONFIG_ACOMPRESSOR_FILTER */
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