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avfilter/af_agate: prepare for adding sidechain version 

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2015-11-29 23:08:22 +01:00
parent 46db068c59
commit acc2347cf4
1 changed files with 33 additions and 26 deletions
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59
libavfilter/af_agate.c
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@ -149,46 +149,29 @@ static double output_gain(double lin_slope, double ratio, double thres,
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, 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 (n = 0; n < nb_samples; n++, src += inlink->channels, dst += inlink->channels, scsrc += sclink->channels) {
double abs_sample = fabs(scsrc[0]), gain = 1.0;
for (c = 0; c < inlink->channels; c++)
dst[c] = src[c] * level_in;
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]), 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]);
abs_sample /= inlink->channels;
abs_sample /= sclink->channels;
}
if (s->detection)
@ -203,6 +186,30 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)
for (c = 0; c < inlink->channels; c++)
dst[c] *= gain * makeup;
}
}
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, inlink, inlink);
if (out != in)
av_frame_free(&in);