* Audio (Sidechain) Compressor filter
*/
+#include "libavutil/audio_fifo.h"
#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/common.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 knee_start;
double knee_stop;
double lin_knee_start;
+ double adj_knee_start;
double compressed_knee_stop;
int link;
int detection;
- AVFrame *input_frame[2];
+ AVAudioFifo *fifo[2];
+ int64_t pts;
} SidechainCompressContext;
#define OFFSET(x) offsetof(SidechainCompressContext, x)
#define F AV_OPT_FLAG_FILTERING_PARAM
static const AVOption 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" },
- { "mix", "set mix", OFFSET(mix), AV_OPT_TYPE_DOUBLE, {.dbl=1}, 0, 1, A|F },
+ { "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)
AVFilterContext *ctx = outlink->src;
SidechainCompressContext *s = ctx->priv;
+ 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;
+
s->attack_coeff = FFMIN(1., 1. / (s->attack * outlink->sample_rate / 4000.));
s->release_coeff = FFMIN(1., 1. / (s->release * outlink->sample_rate / 4000.));
}
static void compressor(SidechainCompressContext *s,
- double *sample, const double *scsrc, int nb_samples,
+ 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;
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 < inlink->channels; c++)
- sample[c] *= (gain * makeup * mix + (1. - mix));
+ dst[c] = src[c] * level_in * (gain * makeup * mix + (1. - mix));
- sample += inlink->channels;
+ src += inlink->channels;
+ dst += inlink->channels;
scsrc += sclink->channels;
}
}
AVFilterContext *ctx = link->dst;
SidechainCompressContext *s = ctx->priv;
AVFilterLink *outlink = ctx->outputs[0];
- const double *scsrc;
- double *sample;
+ AVFrame *out = NULL, *in[2] = { NULL };
+ double *dst;
int nb_samples;
- int ret, i;
+ int 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;
+ av_assert0(i < 2);
+ av_audio_fifo_write(s->fifo[i], (void **)frame->extended_data,
+ frame->nb_samples);
+ av_frame_free(&frame);
- if (!s->input_frame[0] || !s->input_frame[1])
+ nb_samples = FFMIN(av_audio_fifo_size(s->fifo[0]), av_audio_fifo_size(s->fifo[1]));
+ if (!nb_samples)
return 0;
- nb_samples = FFMIN(s->input_frame[0]->nb_samples,
- s->input_frame[1]->nb_samples);
+ 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);
+ }
- sample = (double *)s->input_frame[0]->data[0];
- scsrc = (const double *)s->input_frame[1]->data[0];
+ dst = (double *)out->data[0];
+ out->pts = s->pts;
+ s->pts += nb_samples;
- compressor(s, sample, scsrc, nb_samples,
+ compressor(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]);
- ret = ff_filter_frame(outlink, s->input_frame[0]);
- s->input_frame[0] = NULL;
- av_frame_free(&s->input_frame[1]);
+ av_frame_free(&in[0]);
+ av_frame_free(&in[1]);
- return ret;
+ return ff_filter_frame(outlink, out);
}
static int request_frame(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
SidechainCompressContext *s = ctx->priv;
- int i, ret;
+ int i;
/* get a frame on each input */
for (i = 0; i < 2; i++) {
AVFilterLink *inlink = ctx->inputs[i];
- if (!s->input_frame[i] &&
- (ret = ff_request_frame(inlink)) < 0)
- return ret;
-
- /* request the same number of samples on all inputs */
- if (i == 0)
- ctx->inputs[1]->request_samples = s->input_frame[0]->nb_samples;
+ if (!av_audio_fifo_size(s->fifo[i]))
+ return ff_request_frame(inlink);
}
return 0;
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->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);
+
compressor_config_output(outlink);
return 0;
}
+static av_cold void uninit(AVFilterContext *ctx)
+{
+ SidechainCompressContext *s = ctx->priv;
+
+ av_audio_fifo_free(s->fifo[0]);
+ av_audio_fifo_free(s->fifo[1]);
+}
+
static const AVFilterPad sidechaincompress_inputs[] = {
{
.name = "main",
.type = AVMEDIA_TYPE_AUDIO,
.filter_frame = filter_frame,
- .needs_writable = 1,
- .needs_fifo = 1,
},{
.name = "sidechain",
.type = AVMEDIA_TYPE_AUDIO,
.filter_frame = filter_frame,
- .needs_fifo = 1,
},
{ NULL }
};
.description = NULL_IF_CONFIG_SMALL("Sidechain compressor."),
.priv_size = sizeof(SidechainCompressContext),
.priv_class = &sidechaincompress_class,
- .init = init,
.query_formats = query_formats,
+ .uninit = uninit,
.inputs = sidechaincompress_inputs,
.outputs = sidechaincompress_outputs,
};
#endif /* CONFIG_SIDECHAINCOMPRESS_FILTER */
#if CONFIG_ACOMPRESSOR_FILTER
-static int acompressor_filter_frame(AVFilterLink *inlink, AVFrame *frame)
+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];
- double *sample;
+ 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];
- sample = (double *)frame->data[0];
- compressor(s, sample, sample, frame->nb_samples,
+ compressor(s, src, dst, src, in->nb_samples,
+ s->level_in, s->level_in,
inlink, inlink);
- return ff_filter_frame(outlink, frame);
+ if (out != in)
+ av_frame_free(&in);
+ return ff_filter_frame(outlink, out);
}
static int acompressor_query_formats(AVFilterContext *ctx)
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.filter_frame = acompressor_filter_frame,
- .needs_writable = 1,
},
{ NULL }
};
.description = NULL_IF_CONFIG_SMALL("Audio compressor."),
.priv_size = sizeof(SidechainCompressContext),
.priv_class = &acompressor_class,
- .init = init,
.query_formats = acompressor_query_formats,
.inputs = acompressor_inputs,
.outputs = acompressor_outputs,