* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+/**
+ * @file
+ * Audio (Sidechain) Gate filter
+ */
+
+#include "libavutil/avassert.h"
#include "libavutil/channel_layout.h"
#include "libavutil/opt.h"
#include "avfilter.h"
const AVClass *class;
double level_in;
+ double level_sc;
double attack;
double release;
double threshold;
double lin_slope;
double attack_coeff;
double release_coeff;
+
+ AVFrame *input_frame[2];
} AudioGateContext;
#define OFFSET(x) offsetof(AudioGateContext, x)
#define A AV_OPT_FLAG_AUDIO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
-static const AVOption agate_options[] = {
+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 },
{ "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=0}, 0, 1, A, "detection" },
+ { "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 }
};
-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 config_input(AVFilterLink *inlink)
+static int agate_config_input(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
AudioGateContext *s = ctx->priv;
return 1.;
}
-static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+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)
{
- AVFilterContext *ctx = inlink->dst;
- AVFilterLink *outlink = ctx->outputs[0];
- AudioGateContext *s = ctx->priv;
- const double *src = (const double *)in->data[0];
const double makeup = s->makeup;
const double attack_coeff = s->attack_coeff;
const double release_coeff = s->release_coeff;
- const double level_in = s->level_in;
- AVFrame *out;
- double *dst;
int n, c;
- 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];
-
- for (n = 0; n < in->nb_samples; n++, src += inlink->channels, dst += inlink->channels) {
- double abs_sample = fabs(src[0]), gain = 1.0;
-
- for (c = 0; c < inlink->channels; c++)
- dst[c] = src[c] * level_in;
+ 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 < inlink->channels; c++)
- abs_sample = FFMAX(fabs(src[c]), abs_sample);
+ for (c = 1; c < sclink->channels; c++)
+ abs_sample = FFMAX(fabs(scsrc[c] * level_sc), abs_sample);
} else {
- for (c = 1; c < inlink->channels; c++)
- abs_sample += fabs(src[c]);
+ for (c = 1; c < sclink->channels; c++)
+ abs_sample += fabs(scsrc[c] * level_sc);
- abs_sample /= inlink->channels;
+ abs_sample /= sclink->channels;
}
if (s->detection)
s->lin_knee_stop, s->range);
for (c = 0; c < inlink->channels; c++)
- dst[c] *= gain * makeup;
+ 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);
.name = "default",
.type = AVMEDIA_TYPE_AUDIO,
.filter_frame = filter_frame,
- .config_props = config_input,
+ .config_props = agate_config_input,
},
{ NULL }
};
.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 *in)
+{
+ AVFilterContext *ctx = link->dst;
+ AudioGateContext *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] = in;
+
+ 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];
+
+ gate(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;
+ av_frame_free(&s->input_frame[1]);
+
+ return ret;
+}
+
+static int screquest_frame(AVFilterLink *outlink)
+{
+ AVFilterContext *ctx = outlink->src;
+ AudioGateContext *s = ctx->priv;
+ int i, ret;
+
+ /* 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;
+ }
+
+ 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;
+
+ 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;
+
+ agate_config_input(ctx->inputs[0]);
+
+ return 0;
+}
+
+static const AVFilterPad sidechaingate_inputs[] = {
+ {
+ .name = "main",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .filter_frame = scfilter_frame,
+ .needs_writable = 1,
+ .needs_fifo = 1,
+ },{
+ .name = "sidechain",
+ .type = AVMEDIA_TYPE_AUDIO,
+ .filter_frame = scfilter_frame,
+ .needs_fifo = 1,
+ },
+ { 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,
+ .inputs = sidechaingate_inputs,
+ .outputs = sidechaingate_outputs,
+};
+#endif /* CONFIG_SIDECHAINGATE_FILTER */
projects / ffmpeg / blobdiff